Flexible local heating device

Abstract

The utility model belongs to the technical field of welding heat treatment, and particularly relates to a flexible local heating device which comprises a heat conduction layer, a heating layer, a heat preservation layer and a shell layer which are sequentially arranged. Wherein the heating layer can generate heat and transfer the heat to the heat conduction layer, and the heat conduction layer at least can cover the welding seam. By arranging the heat conduction layer, heat generated by the heating layer is evenly transferred to the welding seam, and therefore the performance of the welding joint can be effectively improved. Meanwhile, the flexible local heating device is used for carrying out precise heat treatment on the local welding seam, so that the heat treatment efficiency can be improved while the energy consumption of heat treatment is reduced.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of welding heat treatment, and particularly relates to a flexible local heating device. Background Art

[0002] During the welding process of pressure vessels, local welds often require heat treatment to improve the performance of the welded joints. Existing heat treatment methods usually heat the entire pressure vessel, which is not only energy-intensive but also inefficient. Utility Model Content

[0003] The purpose of this application is to provide a flexible local heating device that reduces the energy consumption of heat treatment and improves the efficiency of heat treatment by performing precise heat treatment on local welds.

[0004] The present disclosure provides a flexible local heating device for heating a weld, the flexible local heating device comprising a heat-conducting layer, a heating layer, a heat-insulating layer and an outer shell layer arranged in sequence;

[0005] The heating layer can generate heat and transfer heat to the heat-conducting layer. The heat-conducting layer at least covers the weld and transfers the heat to the weld.

[0006] In an exemplary embodiment of the present disclosure, the heat-conducting layer is elastic, and the outer surface of the heat-conducting layer facing away from the heating layer can be bent to completely fit the weld surface, and the inner surface of the heat-conducting layer facing the heating layer does not bend along with the outer surface of the heat-conducting layer.

[0007] In an exemplary embodiment of the present disclosure, the material of the heat-conducting layer is at least one of nano-carbon copper foil, copper foil paper, silver, and graphene woven layer.

[0008] In an exemplary embodiment of the present disclosure, the heating layer includes a heating pipeline, the heating pipeline has thermal conductivity, and a passage is defined inside the heating pipeline, and the passage is used for circulating a medium carrying heat.

[0009] In an exemplary embodiment of the present disclosure, the heating pipe is flexible.

[0010] In an exemplary embodiment of the present disclosure, the heating layer is capable of converting electrical energy into thermal energy, thereby providing heat for the weld.

[0011] In an exemplary embodiment of the present disclosure, the heating layer includes at least one of an electric heating tube or a heating patch.

[0012] In an exemplary embodiment of the present disclosure, the thermal insulation layer includes aerogel and aluminum foil wrapped around the outer periphery of the aerogel.

[0013] In an exemplary embodiment of the present disclosure, the outer shell layer is at least one of high-temperature resistant varnished cloth and non-woven fabric.

[0014] In an exemplary embodiment of the present disclosure, the thermal insulation layer at least covers the heat conductive layer, and the outer shell layer at least covers the thermal insulation layer; and / or,

[0015] The thickness of the heat conducting layer ranges from 1 mm to 5 mm.

[0016] This application has the following beneficial effects:

[0017] The present invention utilizes a flexible localized heating device, sequentially arranging a heat-conducting layer, a heating layer, a heat-insulating layer, and an outer shell layer. The heat-conducting layer evenly transfers heat generated by the heating layer to the weld, effectively improving weld joint performance. Furthermore, the present invention utilizes the flexible localized heating device to precisely heat treat a localized weld, reducing heat treatment energy consumption while also improving heat treatment efficiency.

[0018] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, serve to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and it is clear that those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0021] Figure 1 Schematic diagram of a top-view cross-sectional structure of a flexible local heating device in an embodiment of the present disclosure performing heat treatment on a weld on a curved surface.

[0022] Figure 2 Schematic diagram of the cross-sectional structure of a flexible local heating device for heat treatment of a weld on a plane in an embodiment of the present disclosure.

[0023] Figure 3 for Figure 1 A schematic diagram of a local enlarged structure.

[0024] Figure 4 for Figure 1 Another partially enlarged structural schematic diagram of .

[0025] Figure 5Schematic diagram of the structure of the heating pipeline in the embodiment of the present disclosure.

[0026] Description of reference numerals:

[0027] 1. Flexible local heating device; 11. Heat conducting layer; 12. Heating layer; 121. Heating pipeline; 13. Insulation layer; 14. Outer shell layer;

[0028] 2. Pressure vessel. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0030] In addition, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid blurring various aspects of the present disclosure.

[0031] The present disclosure is further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0032] like Figure 1 and Figure 2 As shown, an embodiment of the present disclosure provides a flexible local heating device 1 for heating a weld. The flexible local heating device 1 includes a heat-conducting layer 11, a heating layer 12, a heat-insulating layer 13, and an outer shell layer 14, which are arranged in sequence. The heating layer 12 can generate heat and transfer it to the heat-conducting layer 11. The heat-conducting layer 11 can at least cover the weld and transfer heat to the weld.

[0033] Welds can be either girth welds or longitudinal welds. Girth welds typically refer to welds formed at the ends of circular or annular components. They can be complete rings or just annular seams at either end. Longitudinal welds refer to welds formed when welding vertical components and are typically linear. Welds can also be of other types.

[0034] For example, the flexible local heating device 1 in the embodiment of the present disclosure can be used for heat treatment of local welds of the pressure vessel 2, but is not limited to this. The flexible local heating device 1 in the present disclosure can also be used for other equipment that requires local weld heat treatment in addition to the pressure vessel 2, and the specific use can be determined according to actual conditions.

[0035] It should be noted that the thermal conductive layer 11 can at least cover the weld, which means that the thermal conductive layer 11 can just cover the weld, but is not limited thereto. The thermal conductive layer 11 can also cover the weld and part of the surrounding area, which can be determined according to actual conditions.

[0036] It should be understood that the above-mentioned flexible local heating device 1 includes a heat-conducting layer 11, a heating layer 12, a thermal insulation layer 13 and an outer shell layer 14 arranged in sequence, which means that when the flexible local heating device 1 performs heat treatment on the weld, the outer surface of the heat-conducting layer 11 covers the weld, and the heating layer 12, the thermal insulation layer 13 and the outer shell layer 14 are arranged in sequence on the side of the heat-conducting layer 11 away from the weld.

[0037] In the disclosed embodiment, the thermally conductive layer 11 is elastic. When the thermally conductive layer 11 is applied to the weld, the outer surface of the thermally conductive layer 11 facing away from the heating layer 12 can bend to completely conform to the weld surface, while the inner surface of the thermally conductive layer 11 facing the heating layer 12 does not bend with the outer surface of the thermally conductive layer 11.

[0038] like Figure 3 Specifically, the outer surface of the heat-conducting layer 11 facing away from the heating layer 12 adapts to the uneven weld and completely fits the weld surface. In this case, the outer surface of the heat-conducting layer 11 presents an uneven structure. However, the inner surface of the heat-conducting layer 11 does not present an uneven structure as the outer surface undergoes the above-mentioned changes.

[0039] When the entire flexible local heating device 1 is adapted to the overall shape of the weld, such as a flat surface or a curved surface, the heating layer 12 is also flat or curved. Figure 1 As shown, the heating layer 12 is bent into an arc shape.

[0040] That is, the heating layer 12 will bend and change along with the entire flexible local heating device 1 to adapt to the shape of the entire weld, but will not change along with the bending change of the heat conducting layer 11 to adapt to the uneven local structure of the weld.

[0041] like Figure 4 As shown, the heating layer 12 may also undergo a slight bending change as the heat-conducting layer 11 bends to adapt to the uneven local structure of the weld, ensuring that the heating layer 12 is not damaged by the bending.

[0042] The thickness of the heat conducting layer 11 may be in the range of 1 mm to 5 mm. For example, the thickness of the heat conducting layer 11 may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc., but is not limited thereto. The thickness of the heat conducting layer 11 may be determined according to actual conditions.

[0043] The embodiment of the present disclosure provides an elastic heat-conducting layer 11 to utilize the elastic deformation of the outer surface of the heat-conducting layer 11 so that when the flexible local heating device 1 is covered on the weld, the outer surface of the heat-conducting layer 11 can completely fit the weld surface, thereby improving the heat transfer efficiency.

[0044] Furthermore, since the weld surface is typically uneven, when the flexible local heating device 1 is not provided with the heat-conducting layer 11, the heating layer 12 needs to be bent to conform to the weld surface, thereby ensuring uniform heating throughout the weld. Multiple bending of the heating layer 12 increases the risk of damage to the heating layer 12.

[0045] The present disclosure provides a thermally conductive layer 11 of a certain thickness in the flexible local heating device 1, so as to fill the concave and convex surfaces at the weld with the thermally conductive layer 11, thereby reducing or avoiding the bending of the heating layer 12, thereby reducing or avoiding the risk of damage to the heating layer 12 due to bending, and further extending the service life of the heating layer 12.

[0046] In the embodiment of the present disclosure, the material of the heat-conducting layer 11 should have good thermal conductivity to ensure that heat is effectively transferred to the area where the weld is located.

[0047] For example, the material of the thermal conductive layer 11 in the present disclosure can be at least one of nanocarbon copper foil, copper foil, silver, and graphene, but is not limited thereto. Other materials with good thermal conductivity and certain elasticity other than nanocarbon copper foil, copper foil, silver, and graphene can be included in the embodiments of the present disclosure.

[0048] like Figure 5 As shown, in some embodiments of the present disclosure, the heating layer 12 may include a heating pipe 121 having a passageway therein for circulating a heated medium. The heated medium is introduced into the passageway to heat the weld. The heating pipe 121 of the present disclosure has excellent thermal conductivity, effectively transferring heat to the weld, thereby reducing heat loss and improving heat transfer efficiency.

[0049] In addition, the heating pipe 121 can also have a certain degree of flexibility, so that the heating pipe 121 can be easily folded according to the shape and size of the weld to increase the effective heating area of ​​the weld by the heating pipe 121. For example, the present disclosure can fold the heating pipe 121 into an S-shaped arrangement, and the medium with heat enters the passage from the inlet end of the heating pipe 121 and leaves the passage from the outlet end. When the medium with heat flows along the passage, its heat is evenly transferred to the weld through the heat-conducting layer 11. In addition, when the weld is on a non-planar surface such as an arc surface, the heating pipe 121 and the heat-conducting layer 11 can be bent to a certain extent, so that the heating pipe 121 and the heat-conducting layer 11 form a shape that is compatible with the non-planar surface, so that the heating pipe 121 and the heat-conducting layer 11 can fit tightly to the weld surface, thereby reducing heat loss and improving heat transfer efficiency.

[0050] It should be noted that the medium with heat mentioned above can be a gaseous medium such as water vapor, or a liquid medium such as ethylene glycol, and the specific medium can be determined according to actual conditions.

[0051] In other embodiments of the present disclosure, the heating layer 12 can also convert electrical energy into thermal energy, thereby providing heat for the weld.

[0052] For example, the heating layer 12 in the embodiment of the present disclosure may include an electric heating pipe. By supplying electricity to the electric heating pipe, the electric heating pipe generates heat.

[0053] Multiple heating tubes can be provided, and these can be connected in series or parallel via wiring. The placement of the heating tubes can be adjusted based on the weld shape to ensure uniform heating of the weld. However, this is not limiting, and a single heating tube can also be provided. Furthermore, the present disclosure allows the heating tubes to be arranged in an S-shaped pattern to improve uniform heating of the weld.

[0054] In addition, the heating layer 12 in the embodiment of the present disclosure may include a heating patch. The heating patch is attached to the inner surface of the heat-conducting layer 11 and energized to generate heat, which is then evenly transferred to the weld through the heat-conducting layer 11.

[0055] It should be noted that, in the embodiment of the present disclosure, the heating layer 12 can be flexibly selected according to different heat treatment requirements.

[0056] Specifically, when the weld heat treatment requires a low temperature, heating pipe 121 can be used to perform a simple heat treatment on the weld, thereby saving energy. When the weld heat treatment requires a higher temperature, which cannot be achieved by heating pipe 121, an electric heating pipe or heating patch can be used to heat the weld. The temperature of the electric heating pipe or heating patch is adjustable, allowing power to be supplied to the electric heating pipe or heating patch according to the different heat treatment requirements of the weld to heat the weld to the required temperature.

[0057] In the disclosed embodiment, the thermal insulation layer 13 may include aerogel and aluminum foil wrapped around the aerogel. While utilizing the low thermal conductivity of the aerogel to reduce heat transfer, the reflective nature of the aluminum foil can also be utilized to reduce heat radiation, thereby achieving a better thermal insulation effect. However, this is not limiting. Insulation layer 13 made of materials other than aerogel and aluminum foil is also encompassed within the disclosed embodiment.

[0058] In the disclosed embodiments, the outer shell layer 14 can be made of at least one of high-temperature resistant varnished cloth and non-woven fabric. High-temperature resistant varnished cloth offers excellent wear resistance, corrosion resistance, and high-temperature resistance, maintaining stable physical and chemical properties in high-temperature environments and resisting deformation or melting. Non-woven fabrics are also flexible and malleable. However, this disclosure is not limited to these materials. The outer shell layer 14 can also be made of materials other than high-temperature resistant varnished cloth and non-woven fabrics, and the choice of material can be tailored to the construction site conditions.

[0059] For example, when outer shell 14 requires waterproofing, a specific waterproof material can be selected to make outer shell 14. Otherwise, outer shell 14 can be made of woven fabric. The present disclosure selects the material for outer shell 14 based on construction site conditions, making outer shell 14 suitable for a variety of application scenarios and thereby enhancing the market competitiveness of flexible local heating device 1.

[0060] It should be noted that the thermal insulation layer 13 in the embodiment of the present disclosure may just cover the heat conducting layer 11 , or the thermal insulation layer 13 may cover the heat conducting layer 11 and part of the surrounding area to reduce heat loss of the flexible local heating device 1 .

[0061] The outer shell 14 can just cover the thermal insulation layer 13, or it can cover the thermal insulation layer 13 and part of its surrounding area. That is, the outer shell 14 completely encloses the thermal conductive layer 11 and the thermal insulation layer 13, thereby further reducing heat loss from the flexible local heating device 1 and improving the overall thermal insulation performance of the flexible local heating device 1. At the same time, the outer shell 14 can also protect the thermal insulation layer 13 and the thermal conductive layer 11, reducing or avoiding the risk of damage to the thermal insulation layer 13 and the thermal conductive layer 11, thereby extending the overall service life of the flexible local heating device 1.

[0062] In the disclosed embodiment, the thermal insulation layer 13 and the outer shell layer 14 may also completely cover the side of the heating layer 12 facing away from the heat-conducting layer 11. The orthographic projection of the heating layer 12 on the thermal insulation layer 13 may be located within the orthographic projection of the heat-conducting layer 11 on the thermal insulation layer 13, but is not limited thereto. The orthographic projection of the heating layer 12 on the thermal insulation layer 13 may also overlap with the orthographic projection of the heat-conducting layer 11 on the thermal insulation layer 13, and the specific configuration may be determined based on actual conditions.

[0063] By providing a flexible localized heating device 1, the present disclosure can achieve localized, precise heating based on the location of the weld. This avoids heating the entire device where the weld is located, saving heating energy. It also increases the heating rate of the weld by the flexible localized heating device 1, thereby improving its operating efficiency. Furthermore, compared to heating devices that heat the entire device where the weld is located, the flexible localized heating device 1 of the present disclosure is compact, easy to carry and operate, and suitable for a variety of working environments.

[0064] In the disclosed embodiment, the steps for utilizing the flexible localized heating device 1 for construction may include: determining the heating method for the heating layer 12 based on the process requirements of the weld to be locally heat treated. For example, when the weld heat treatment temperature requirement is low, the heating pipe 121 may be used for heat treatment of the weld. When the weld heat treatment temperature requirement is high, an electric heating pipe or heating patch may be used for heat treatment of the weld. After determining the heating method for the heating layer 12, the flexible localized heating device 1 with the heating layer 12 configured with the specified heating method is placed over the weld to heat the weld.

[0065] The heat conducting layer 11 , the heating layer 12 , the heat insulating layer 13 and the outer shell layer 14 in the flexible local heating device 1 may be first bound and connected, and then covered together at the weld position requiring heat treatment.

[0066] However, the present disclosure is not limited to this. The heat-conducting layer 11, the heating layer 12, the thermal insulation layer 13 and the outer shell 14 can also be covered on the weld layer one by one. That is, the heat-conducting layer 11 is first covered on the weld to be treated, and the outer side of the heat-conducting layer 11 is tightly fitted with the weld surface. According to the selected heating method, the heating layer 12 is set on the inner side of the heat-conducting layer 11. The thermal insulation layer 13 is laid on the side of the heating layer 12 away from the heat-conducting layer 11, and the thermal insulation layer 13 completely covers the heat-conducting layer 11 to reduce heat loss and improve heat treatment efficiency. Then, according to the conditions of the construction site, a suitable outer shell 14 is covered on the side of the thermal insulation layer 13 away from the heating layer 12.

[0067] It should be noted that the heat-conducting layer 11, the heating layer 12, the thermal insulation layer 13 and the outer shell 14 in the present disclosure can be bound together by iron wire, but is not limited to this. The present disclosure can also coat adhesive on the edge areas of the heat-conducting layer 11, the heating layer 12, the thermal insulation layer 13 and the outer shell 14 to achieve bonding between the structural layers.

[0068] In the description of the present disclosure, “plurality” means two or more, unless otherwise clearly and specifically defined.

[0069] It should be noted that "upper" and "lower" are only used to distinguish for the convenience of description, and do not impose any directional restrictions on the embodiments of the present invention. For example, the "upper" may actually be the "lower" orientation. In this disclosure, unless otherwise clearly specified and limited, the terms "assembly" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to the specific circumstances.

[0070] In the description of this specification, the reference terms "some embodiments", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0071] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present disclosure. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present disclosure. Therefore, any changes or modifications made in accordance with the claims and description of the present disclosure shall fall within the scope of the patent of the present disclosure.

Claims

1. A flexible local heating device for heating a weld, characterized in that: It includes a heat-conducting layer, a heating layer, a heat-insulating layer and an outer shell layer arranged in sequence; The heating layer can generate heat and transfer heat to the heat-conducting layer, and the heat-conducting layer at least covers the weld and transfers the heat to the weld; The heat-conducting layer is elastic, and the outer surface of the heat-conducting layer facing away from the heating layer can be bent to completely fit the weld surface, while the inner surface of the heat-conducting layer facing the heating layer does not bend along with the outer surface of the heat-conducting layer.

2. The flexible local heating device according to claim 1, characterized in that The material of the heat conducting layer is at least one of nano-carbon copper foil, copper foil, silver and graphene.

3. The flexible local heating device according to claim 1, characterized in that The heating layer includes a heating pipeline, the heating pipeline has thermal conductivity, and a passage is formed inside the heating pipeline, and the passage is used for the circulation of a medium carrying heat.

4. The flexible local heating device according to claim 3, characterized in that The heating pipeline is flexible.

5. The flexible local heating device according to claim 1, characterized in that The heating layer can convert electrical energy into thermal energy, thereby providing heat for the weld.

6. The flexible local heating device according to claim 5, characterized in that The heating layer includes at least one of an electric heating tube or a heating patch.

7. The flexible local heating device according to claim 1, characterized in that The heat-insulating layer comprises aerogel and aluminum foil wrapped around the outer periphery of the aerogel.

8. The flexible local heating device according to claim 1, characterized in that The outer shell layer is at least one of high-temperature resistant varnished cloth and non-woven fabric.

9. The flexible local heating device according to claim 1, characterized in that The thermal insulation layer at least covers the heat-conducting layer, and the outer shell layer at least covers the thermal insulation layer; and / or, The thickness of the heat conducting layer ranges from 1 mm to 5 mm.

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