Tube plate electromagnetic induction heating device and heater thereof

Abstract

The utility model discloses a tube plate electromagnetic induction heating device and a heater thereof, and belongs to the technical field of tube plate preheating equipment. The heating device comprises an electromagnetic induction coil, the electromagnetic induction coil is arranged in a plane spiral structure, and the side, away from the tube plate, of the electromagnetic induction coil is covered with a heat preservation insulating layer. The tube plate electromagnetic induction heater comprises the heating device and further comprises a control host, and the heating device is electrically connected to the control host. In order to improve the preheating process of the heat exchanger tube plate, the electromagnetic induction heating technology is adopted, the heating uniformity is ensured, the problems that in traditional resistance wire heating or flame heating, the surface temperature rise speed is high, and internal heating is insufficient are effectively solved, the aerogel felt layer is arranged in a matched mode, and the heat exchange efficiency is improved. The extremely low heat conductivity coefficient can significantly reduce heat loss of the heater in the heating process, the energy utilization rate is improved, and the problem of insufficient heating caused by rapid heat dissipation after heating is stopped is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of tube sheet preheating equipment, specifically relating to a tube sheet electromagnetic induction heating device and its heater. Background Technology

[0002] As a key component connecting the heat exchanger tubes and the shell, the welding quality of the heat exchanger tube sheet directly affects the overall performance and service life of the heat exchanger. To improve welding quality and ensure the strength and sealing of the weld joint, the heat exchanger tube sheet needs to be fully preheated before welding to the heat exchanger tubes. Preheating can reduce welding stress, prevent the formation of welding cracks, and improve the mechanical properties of the weld joint.

[0003] Traditional heat exchanger tube sheet preheating methods, such as resistance wire heating or flame heating, have many technical problems. Heat exchanger tube sheets are usually honeycomb structures with a large thickness (typically 400 mm) and a densely distributed network of pores on the surface. This special structure causes traditional heating methods to exhibit rapid surface heating during the heating process and rapid heat dissipation after heating stops. Continuous heating or increasing the heating time can easily lead to excessively high surface temperatures on the tube sheet, causing overheating and affecting welding quality. After heating stops, due to rapid heat dissipation, it is difficult to maintain the internal temperature of the tube sheet, resulting in insufficient heating and failure to meet the preheating requirements before welding. Utility Model Content

[0004] To address the problem that the heating and cooling rates of current heaters are too fast, affecting the quality of subsequent welding, this utility model provides a tube sheet electromagnetic induction heating device and its heater.

[0005] The embodiments of this utility model are achieved through the following technical solutions:

[0006] An electromagnetic induction heating device for tube sheets includes an electromagnetic induction coil, which is arranged in a planar spiral structure, and the side of the electromagnetic induction coil away from the tube sheet is covered with a heat-insulating layer.

[0007] This design reduces energy loss and, combined with the electromagnetic field heating provided by the electromagnetic induction coil, allows heat to penetrate deep into the tube sheet. This is particularly effective for honeycomb structures like heat exchanger tube sheets, avoiding the problems of rapid surface heating and insufficient internal heating found in traditional heating methods. Furthermore, the planar spiral structure of the electromagnetic induction coil ensures a uniform distribution of the electromagnetic field on the tube sheet surface, improving heating efficiency and uniformity.

[0008] In some technical solutions of this utility model, the heating device includes an aerogel felt layer, which is disposed between the heat insulation layer and the electromagnetic induction coil.

[0009] Aerogel felt, as a thermal insulation material, has an extremely low thermal conductivity that can significantly reduce heat loss during the heating process of the heater and improve energy utilization.

[0010] In some technical solutions of this utility model, the electromagnetic induction coil is cast onto the aerogel felt layer with epoxy resin.

[0011] This design makes the position of the electromagnetic induction coil more stable.

[0012] In some technical solutions of this utility model, the electromagnetic induction coil is a flat coil.

[0013] The flat coil design not only increases the surface area of ​​the coil, which is beneficial for heat dissipation, but also makes the electromagnetic field distribution on the tube sheet surface more uniform.

[0014] A tube sheet electromagnetic induction heater includes the aforementioned tube sheet electromagnetic induction heating device and a control host, wherein the heating device is electrically connected to the control host.

[0015] In some technical solutions of this utility model, there are multiple heating devices connected in series. The first heating device is electrically connected to a first wire, and the last heating device is electrically connected to a second wire. The first wire and the second wire are electrically connected to the control host.

[0016] The series connection of the heating devices increases the area that the heater can preheat the tube sheet.

[0017] In some technical solutions of this utility model, a first quick-connect connector is provided between the first wire and the control host, and between the second wire and the control host.

[0018] This design allows for quick and easy disassembly of the control unit and heating device.

[0019] In some technical solutions of this utility model, a thermocouple for measuring tube sheet temperature is also included, and the thermocouple is electrically connected to the control host.

[0020] This design increases the system's intelligence level and reduces operational difficulty and labor costs. In some technical solutions of this utility model, the first heating device is provided with a first binding strap, and the last heating device is provided with a second binding strap; the first and second binding straps are detachably coupled.

[0021] This design facilitates the storage of connected heating devices.

[0022] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0023] In this invention, the traditional resistance temperature detector (RTD) is replaced with an electromagnetic induction coil, and electromagnetic induction heating technology is used to improve heating efficiency, make the preheating process faster, ensure heating uniformity, and effectively avoid the phenomenon of rapid surface heating and insufficient internal heating that is prone to occur in traditional resistance wire heating or flame heating. At the same time, the addition of a heat insulation layer solves the problem of insufficient heating caused by rapid heat dissipation after the heater stops heating. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a tube sheet electromagnetic induction heater according to one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of a tube sheet electromagnetic induction heater installed on a tube sheet according to one embodiment of the present invention;

[0026] Figure 3 This is a partial structural schematic diagram of a tube sheet electromagnetic induction heater according to one embodiment of the present invention;

[0027] Figure 4 This is one of the structural schematic diagrams of a tube sheet electromagnetic induction heating device according to one embodiment of the present invention;

[0028] Figure 5 This is a second schematic diagram of the structure of a tube sheet electromagnetic induction heating device according to one embodiment of the present invention;

[0029] Figure 6 This is the third schematic diagram of the structure of a tube sheet electromagnetic induction heating device according to one embodiment of the present invention.

[0030] Icons: 1-Control host, 2-Heating device, 3-Electromagnetic induction coil, 4-Insulation layer, 5-Aerogel felt layer, 6-Epoxy resin, 7-Second binding strap, 8-Insulation mask, 9-Thermocouple, 10-First wire, 11-Second wire, 12-First quick connector, 13-First binding strap. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that if terms such as "inner" or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they 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.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "configure," and "connect" 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.

[0036] Example 1

[0037] Please refer to Figures 4-5 This embodiment provides a tube sheet electromagnetic induction heating device, including an electromagnetic induction coil 3. The electromagnetic induction coil 3 is arranged in a planar spiral structure, and the side of the electromagnetic induction coil 3 away from the tube sheet is covered with a heat-insulating layer 4.

[0038] The working principle of the electromagnetic induction heater is as follows: the planar spiral structure is a two-dimensional spiral structure, the electromagnetic induction coil 3 is a high-frequency electromagnetic induction coil 3, and the high-frequency electromagnetic induction line adopts a high-frequency line. High frequency, also known as high frequency wave or high frequency machine, refers to electromagnetic waves with a frequency greater than 100KHz. High-frequency lines typically refer to production lines that use high-frequency electromagnetic waves for heating, welding, or processing. High-frequency lines contain high-purity copper, which has excellent conductivity and corrosion resistance, effectively reducing resistance loss and oxidation during the heating process. The insulation layer 4 is made of Kevlar, also known as poly(p-phenylene terephthalamide). Kevlar has low density, high strength, good toughness, permanent heat resistance and flame retardancy, and a limiting oxygen index (LOi) greater than 28. When heating the tube sheet, the heating device 2 is first placed on the tube sheet. At this time, the side of the electromagnetic induction coil 3 away from the insulation layer 4 is in contact with the tube sheet. Then, the electromagnetic induction coil 3 is energized, causing the heating device 2 to start working and preheating the tube sheet. The heating device 2 is attached to the outside of the heated tube sheet, while the side of the heating device 2 away from the tube sheet is the insulation layer 4, which effectively keeps the heated tube sheet warm.

[0039] This design reduces energy loss and, combined with the electromagnetic field heating provided by the electromagnetic induction coil 3, allows heat to penetrate deep into the tube sheet. This is particularly effective for honeycomb structures like heat exchanger tube sheets, avoiding the problems of rapid surface heating and insufficient internal heating found in traditional heating methods. Furthermore, the planar spiral structure of the electromagnetic induction coil 3 ensures a uniform distribution of the electromagnetic field on the tube sheet surface to a certain extent, improving heating efficiency and uniformity.

[0040] In a preferred embodiment, the heating device 2 includes an aerogel felt layer 5, which is disposed between the thermal insulation layer 4 and the electromagnetic induction coil 3.

[0041] In the above embodiment, the aerogel felt layer 5 serves as a heat insulation material. Its extremely low thermal conductivity significantly reduces heat loss during the heating process, improves energy utilization, and solves the problem of insufficient heating caused by rapid heat dissipation after heating stops.

[0042] In a preferred embodiment, the electromagnetic induction coil 3 is cast onto the aerogel felt layer 5 using epoxy resin 6.

[0043] In the above embodiments, the design of casting epoxy resin 6 on the aerogel felt layer 5 not only enhances the bonding strength between the electromagnetic induction coil 3 and the aerogel felt layer 5, preventing the coil from loosening or falling off during the heating process, but also forms a hard protective layer. Epoxy resin 6 also has good insulation properties, further ensuring operational safety and improving the durability and protection level of the entire heater.

[0044] As a preferred implementation, the electromagnetic induction coil 3 is a flat coil.

[0045] In the above embodiments, the design of the flat coil not only increases the surface area of ​​the coil, which is beneficial for heat dissipation, but also makes the electromagnetic field distribution on the tube sheet surface more uniform. Especially when dealing with workpieces with complex geometric structures such as heat exchanger tube sheets, the flat coil can better adapt to its surface shape and achieve more efficient and uniform heating.

[0046] Example 2

[0047] In the heating device 2, there are two heat insulation layers 4, which are respectively located on both sides of the electromagnetic induction coil 3, and the rest is the same as in embodiment 1.

[0048] Both sides of the electromagnetic induction coil 3 are provided with heat insulation layers 4, which eliminates the need for personnel to distinguish which side is attached to the tube plate when using the heating device 2. Furthermore, the heating device 2 is enclosed, which further improves the insulation performance and increases safety.

[0049] Example 3

[0050] In the heating device 2, there are two thermal insulation layers 4 and two aerogel felt layers 5, and they correspond one-to-one. That is, the two thermal insulation layers 4 and the two aerogel felt layers 5 are divided into two groups. Each group is arranged on both sides of the electromagnetic induction coil 3 in the order of position in Example 1. The rest is the same as in Example 1.

[0051] This design can further enhance the heat insulation effect of the heating device 2.

[0052] Example 4

[0053] In heating device 2, both sides of electromagnetic induction coil 3 are cast with epoxy resin 6 onto the corresponding aerogel felt layer 5, and the rest is the same as in embodiment 3.

[0054] This design makes the position of the electromagnetic induction coil 3 more stable, further enhancing the insulation effect.

[0055] Example 5

[0056] like Figure 6The edges of the two thermal insulation layers 4 are connected to form a thermal insulation mask 8. The electromagnetic induction coil 3 and the two aerogel felt layers 5 are all located inside the thermal insulation mask 8, and the rest is the same as in embodiment 4. When storing the heating device 2, it can be folded. Preferably, creases are pre-made on the thermal insulation mask 8 (the creases can be bent during the initial processing and manufacturing) to facilitate folding and storage.

[0057] Example 6

[0058] Please refer to Figures 1-6 A tube sheet electromagnetic induction heater includes the tube sheet electromagnetic induction heating device 2 described in any one of the embodiments 1-5 above, and also includes a control host 1, with the heating device 2 electrically connected to the control host 1.

[0059] The control host 1 is a central processing unit, preferably an ARM processor. When it is necessary to heat the tube sheet, the heating device 2 is first placed on the tube sheet, and then the control host 1 controls the heating device 2 to start, and the heating device 2 starts to work to preheat the tube sheet.

[0060] In a preferred embodiment, there are multiple heating devices 2 connected in series. The first heating device 2 is electrically connected to a first wire 10, and the last heating device 2 is electrically connected to a second wire 11. The first wire 10 and the second wire 11 are electrically connected to the control host 1.

[0061] In the above embodiment, a second quick-connect connector is provided between the multiple heating devices 2; the series connection of the heating devices 2 increases the area that the heater can preheat the tube sheet.

[0062] In a preferred embodiment, a first quick-connect connector 12 is provided between the first wire 10 and the control host 1, and between the second wire 11 and the control host 1.

[0063] In the above embodiment, the first quick-connect connector 12 includes a male plug and a female plug for insertion and mating. The first lead wire 10 is provided with a male plug, and the control host 1 is provided with a quick-connect female plug that mates with the male quick-connect connector. The second lead wire 11 is provided with a female plug, and the control host 1 is provided with a male plug that mates with the female plug. This design allows for quick disassembly and reassembly of the control host 1 and the heating device 2, making it more convenient. As a preferred embodiment, a thermocouple 9 for measuring the tube sheet temperature is also included, and the thermocouple 9 is electrically connected to the control host 1.

[0064] In the above embodiment, the temperature measuring point of thermocouple 9 is placed on the tube sheet to be measured, and a suitable fixing device (such as heat-resistant polyimide tape) is used to fix thermocouple 9 to the temperature measuring point, ensuring good contact between the temperature measuring point and the object or environment to obtain accurate temperature measurement values. Thermocouple 9 can monitor the temperature change of the tube sheet surface in real time and accurately. Through electrical connection with the control host 1, thermocouple 9 transmits the temperature signal to the control host 1. The control host 1 automatically adjusts the heating power of multiple electromagnetic induction coils 3 according to preset temperature parameters and heating curves to achieve precise temperature control. This closed-loop control system ensures that the tube sheet is always within the optimal temperature range during the preheating process before welding, improving welding quality and production efficiency. This design increases the intelligence level of the system and reduces the difficulty of operation and labor costs.

[0065] As a preferred implementation, a second quick-connect connector is provided between any two heating devices 2. The second quick-connect connector includes a male plug and a female plug that are mated together. One end of any heating device 2 is provided with a male plug, and the other end is provided with a female plug that is mated together with the male plug. This design allows for quick replacement when individual heating devices 2 malfunction, and also allows operators to increase or decrease the number of tube sheet assemblies that need to be preheated.

[0066] In a preferred embodiment, the thermocouple 9 is connected in series between multiple heating devices 2 and is connected between the heating devices 2 by a third quick-connect connector. The third quick-connect connector includes a male plug and a female plug that are mated together. One end of the thermocouple 9 is provided with a male plug and the other end is provided with a female plug that is mated together with the male plug.

[0067] In a preferred embodiment, the first heating device 2 is provided with a first binding strap 13, and the last heating device 2 is provided with a second binding strap 7. The first binding strap 13 and the second binding strap 7 are detachably coupled.

[0068] In the above embodiment, the first strap and the second strap are respectively provided with male and female buckles that can be fastened together; this design facilitates the storage of the connected heating device 2; it is worth noting that there can be multiple female buckles. When the heater contains multiple heating devices 2 and personnel need to store them, the multiple heating devices 2 connected in series can be folded appropriately first. During the folding process, it is preferable to place the first heating device 2 on top and the last heating device 2 on the bottom, and then use the male buckle of the first strap 13 and the female buckle at the appropriate position on the second strap 7 to fix it.

[0069] In summary, the embodiments of this utility model provide a tube sheet electromagnetic induction heating device and its heater. This application adopts electromagnetic induction heating technology, which not only greatly improves the heating efficiency and makes the preheating process faster, but also ensures the uniformity of heating by carefully designing and arranging the high-frequency induction coil as a flat coil. This effectively avoids the problems of rapid surface heating and insufficient internal heating that are easy to occur in traditional resistance wire heating or flame heating. At the same time, the combination of the first insulation layer and the second insulation layer effectively avoids the problem of insufficient heating caused by rapid heat dissipation of the tube sheet after the traditional electric heater stops heating.

[0070] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tube sheet electromagnetic induction heating device, comprising an electromagnetic induction coil (3), characterized in that, The electromagnetic induction coil (3) is arranged in a planar spiral structure, and the side of the electromagnetic induction coil (3) away from the tube sheet is covered with a heat-insulating layer (4).

2. The tube sheet electromagnetic induction heating device according to claim 1, characterized in that, It also includes an aerogel felt layer (5), which is disposed between the thermal insulation layer (4) and the electromagnetic induction coil (3).

3. The tube sheet electromagnetic induction heating device according to claim 2, characterized in that, The electromagnetic induction coil (3) is cast onto the aerogel felt layer (5) using epoxy resin (6).

4. The tube sheet electromagnetic induction heating device according to claim 1, characterized in that, The electromagnetic induction coil (3) is a flat coil.

5. A tube sheet electromagnetic induction heater, characterized in that, The tube sheet electromagnetic induction heating device according to any one of claims 1-4 further includes a control host (1), and the heating device (2) is electrically connected to the control host (1).

6. A tube sheet electromagnetic induction heater according to claim 5, characterized in that, The number of heating devices (2) is multiple, and the electromagnetic induction coils (3) of each heating device (2) are connected in series. The first heating device (2) is electrically connected to the first wire (10), and the last heating device (2) is electrically connected to the second wire (11). The first wire (10) and the second wire (11) are electrically connected to the control host (1).

7. A tube sheet electromagnetic induction heater according to claim 6, characterized in that, A first quick-connector (12) is provided between the first wire (10) and the control host (1) and between the second wire (11) and the control host (1).

8. A tube sheet electromagnetic induction heater according to claim 5, characterized in that, It also includes a thermocouple (9) for measuring tube sheet temperature, the thermocouple (9) being electrically connected to the control host (1).

9. A tube sheet electromagnetic induction heater according to claim 6, characterized in that, The first heating device (2) is provided with a first binding strap (13), and the last heating device (2) is provided with a second binding strap (7). The first binding strap (13) and the second binding strap (7) are detachably connected.

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