Electric heating integrated heat preservation device

Abstract

The invention discloses an electric heating integrated heat preservation device, which is applied to the technical field of integrated heat preservation devices, and comprises two groups of first outer shells, two groups of second outer shells, a target pipeline, four groups of inner shells and a monitoring assembly, the inner shells are arranged in the first outer shells and the second outer shells, and the two groups of inner shells are symmetrically arranged on the periphery of the target pipeline; every two sets of inner shells correspond to the two sets of first outer shells and the two sets of second outer shells in position, the first outer shells are connected with the second outer shells, the monitoring assemblies are arranged in the first outer shells and the second outer shells, and the four sets of inner shells are the same in length. The monitoring assembly is used for monitoring the temperature, humidity, vacuum degree and medium leakage in the first shell and the second shell, dynamic adaptation to pipeline deformation can be achieved, sealing failure caused by vibration of a target pipeline is avoided, and the heat preservation effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated thermal insulation devices, and particularly to an electric heating integrated thermal insulation device. Background Art

[0002] As a core means for the thermal management of liquid sodium pipelines, the electric heating integrated thermal insulation device plays a key role in high-temperature industries and sodium-cooled reactors in preventing sodium solidification (freezing point ≈ 97.8°C), maintaining flow stability, and avoiding thermal stress damage.

[0003] However, existing thermal insulation technologies face multiple challenges in the scenario of liquid sodium transportation. During operation, the turbulent impact and mechanical vibration of liquid sodium cause the thermal insulation layer to fit loosely, and millimeter-scale gaps form a thermal bridge effect, resulting in a 3 - 5-fold increase in local heat flux density. Lightweight materials are more likely to induce grain boundary fracture due to long-term vibration, and the thermal insulation performance decays non-linearly. When the device is out of operation, moisture infiltration will react with the residual sodium to generate hydrogen and strong alkali, leading to explosion and corrosion. Hygroscopic materials, such as silicates, are prone to caking and pulverization in a humid environment. Secondly, the disassembly and maintenance of traditional thermal insulation layers take too long, unable to meet the requirements of the safety window, which further leads to prominent safety hazards in liquid sodium pipelines and high maintenance costs.

[0004] Therefore, it is necessary to provide an electric heating integrated thermal insulation device to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an electric heating integrated thermal insulation device to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: An electric heating integrated thermal insulation device includes two groups of first outer shells, two groups of second outer shells, a target pipeline, four inner shells, and a monitoring component. The inner shells are arranged inside the first outer shells and the second outer shells. Every two inner shells located in the radial direction of the target pipeline are symmetrically arranged around the target pipeline. The two inner shells located in the axial direction of the target pipeline correspond to the positions of the first outer shell and the second outer shell respectively. The first outer shell and the second outer shell are connected. The monitoring component is arranged inside the first outer shell and the second outer shell. The lengths of the four inner shells are the same. The monitoring component is used to monitor the temperature of the inner shell after heating, the temperature, humidity, vacuum degree inside the first outer shell and the second outer shell, and whether there is sodium leakage. First chutes are arranged at both ends of the inner shell, and an inner thermal insulation layer is slidably connected in the first chutes. A plurality of buffer components are arranged between the first chutes and the inner thermal insulation layer. The monitoring component includes a thermocouple, a temperature and humidity sensor, a vacuum detector, and a sodium leakage insulator. The monitoring component is signal-connected to a monitoring module, and the monitoring module is signal-connected to a heating component and a regulation component. The monitoring module is used to collect and monitor the temperature after the inner shell is heated, the temperature, humidity, and vacuum degree inside the first outer shell and the second outer shell, and whether there is sodium leakage, and then make a safety monitoring judgment according to the collected results, and control the heating component and the regulation component to make adjustments.

[0007] According to the above technical solution, two sets of connecting pieces are arranged around the connection of the first outer shell and the second outer shell. The two sets of connecting pieces are symmetrically arranged, and the ends of the two sets of connecting pieces are connected by fasteners. Sealing gaskets are arranged on the sides of the connecting pieces close to the first outer shell and the second outer shell.

[0008] According to the above technical solution, first end faces are arranged at both ends of the first outer shell. The center of the first end face is arranged in a stepped shape. First ventilation holes are opened on the first end face. Two first support surfaces are fixedly connected to the opposite sides of the two first outer shells. Second ventilation holes are opened on the first support surfaces. A number of first inner supports are fixedly connected to the inside of the first outer shell. A first ventilation opening is fixedly connected to the top of the first outer shell at the upper position, and a second ventilation opening is fixedly connected to the bottom of the first outer shell at the lower position. A middle heat insulation layer is fixedly connected to the center of the first end face. The middle heat insulation layer is a hollow structure. The radial cross-section of the middle heat insulation layer is fan-shaped. The inner heat insulation layer is fixed at the center of the fan shape of the middle heat insulation layer.

[0009] According to the above technical solution, a high-temperature heat insulation cloth is arranged between the first end face of the second outer shell and the first outer shell. The structure of the second outer shell is the same as that of the first outer shell, but the length of the second outer shell is greater than the length of the first outer shell; The lengths of the inner shell, the middle heat insulation layer, and the first outer shell inside the first outer shell are arranged in decreasing order; The lengths of the inner shell, the middle heat insulation layer, and the second outer shell inside the second outer shell are arranged in increasing order; In the axial direction of the target pipeline, the inner shells and the middle heat insulation layers of two adjacent groups on the same side are continuously connected. In the radial direction of the target pipeline, the inner shells and the middle heat insulation layers inside the first outer shell and the inner shells and the middle heat insulation layers inside the second outer shell form a stepped connection with equal length and staggered interlocking.

[0010] According to the above technical solution, the buffer assembly includes a support frame, a second inner support, a spring and a telescopic rod. The support frame is fixed to the outer wall of the inner shell. A plurality of second chutes and limit holes are provided on the support frame. The second inner support is fixedly connected inside the inner thermal insulation layer. A third chute is provided on the second inner support. A first slider is arranged in the second chute, and the first slider is slidably connected to the second chute. A second slider is arranged in the third chute, and the second slider is slidably connected to the third chute.

[0011] According to the above technical solution, the telescopic rod and the spring are fixed between the first slider and the second slider. The spring is arranged around the telescopic rod, and a plurality of air holes are provided on the telescopic rod.

[0012] According to the above technical solution, the thermocouple is connected to the inner shell. The temperature and humidity sensor and the vacuum degree detector are fixed to the inner walls of the first outer shell and the second outer shell. The sodium leakage insulator is fixed to the bottom of the inner shell.

[0013] According to the above technical solution, the heating assembly includes a heating wire. The heating wire is arranged on the outer surface of the inner shell. The heating wire is arranged in the limit holes on the support frame, and single-core terminal devices are connected to both ends of the heating wire.

[0014] According to the above technical solution, the control assembly includes a dehumidifier, a blower and a three-way valve. A first branch pipeline is connected to the second air exchange port at the bottom of the first outer shell and the second outer shell. A second branch pipeline is connected to the first air exchange port at the top of the first outer shell and the second outer shell. The first branch pipeline is connected to a main pipeline. The dehumidifier, the blower and the three-way valve are arranged on the main pipeline; The three-way valve includes a set of inlets and two sets of outlets. The main pipeline is connected to the inlet and one set of outlets of the three-way valve. The other set of outlets of the three-way valve is used for evacuation, and solenoid valves are arranged on both the first branch pipeline and the second branch pipeline.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: In the present invention, through the axial alternating arrangement of the first outer shell, the second outer shell, the inner shell, the inner thermal insulation layer and the middle thermal insulation layer, a stepped sealed space with multiple layers of nesting is formed, effectively blocking the loss of heat from the connection points. At the same time, a split outer shell structure is formed, which is convenient for overhauling internal components and reduces the maintenance cost; By setting the buffer assembly, the inner shell can dynamically adapt to the deformation of the pipeline, and at the same time buffer the pressure fluctuation, fluid impact or mechanical vibration, avoiding the sealing failure caused by the vibration of the target pipeline. At the same time, the slidably connected inner shell and inner thermal insulation layer can also expand the application range of the thermal insulation device; By setting up a monitoring component, a monitoring module, a heating component and a regulation component, it is possible to monitor the heating situation of the inner shell, the internal sealing situations of the first outer shell and the second outer shell, the internal humidity situation and its own situation, so as to avoid the reduction of the heat preservation effect caused by the completion of sealing and avoid potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a left-view schematic diagram of the internal structure at the first outer shell of the present invention; Figure 3 is a right-view schematic diagram of the internal structure at the first outer shell of the present invention; Figure 4 is a left-view schematic diagram of the internal structure at the second outer shell of the present invention; Figure 5 is a right-view schematic diagram of the internal structure at the second outer shell of the present invention; Figure 6 is a sectional structural schematic diagram of the connection of the overall structure of the present invention; Figure 7 is of the present invention Figure 6 magnified structural schematic diagram of area A therein; Figure 8 is a left-view sectional structural schematic diagram of the overall structure of the present invention; Figure 9 is of the present invention Figure 8 magnified structural schematic diagram of area B therein; Figure 10 is a schematic diagram of the pipeline connection of the regulation component of the present invention; In the figures: 1. First outer shell; 11. First end face; 12. First air exchange hole; 13. First support surface; 14. Second air exchange hole; 15. First inner support; 16. First air vent; 17. Second air vent; 18. Middle heat insulation layer; 2. Second outer shell; 21. High-temperature heat insulation cloth; 3. Target pipeline; 4. Inner shell; 41. First sliding groove; 42. Inner heat insulation layer; 43. Buffer component; 431. Support frame; 432. Second sliding groove; 433. Second inner support; 434. Third sliding groove; 435. First slider; 436. Second slider; 437. Spring; 438. Telescopic rod; 439. Air hole; 4310. Limit hole; 5. Connector; 6. Heating component; 61. Heating wire; 62. Single-core terminal; 7. Monitoring component; 71. Thermocouple; 72. Temperature and humidity sensor; 73. Vacuum detector; 74. Sodium leakage insulator; 8. Regulation and control component; 81. Dehumidifier; 82. Fan; 83. Three-way valve; 84. First branch pipeline; 85. Main pipeline; 86. Second branch pipeline; 87. Solenoid valve. Specific implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1-10 , the present invention provides a technical solution: an electric heating integrated heat preservation device, including two groups of first outer shells 1, two groups of second outer shells 2, a target pipeline 3, four groups of inner shells 4, and a monitoring component 7. The inner shells 4 are arranged inside the first outer shells 1 and the second outer shells 2. Every two inner shells 4 located in the radial direction of the target pipeline 3 are symmetrically arranged around the target pipeline 3. The two inner shells 4 located in the axial direction of the target pipeline 3 correspond to the positions of the first outer shell 1 and the second outer shell 2 respectively. The first outer shell 1 and the second outer shell 2 are connected. The monitoring component 7 is arranged inside the first outer shell 1 and the second outer shell 2. The lengths of the four groups of inner shells 4 are the same. The monitoring component 7 is used to monitor the temperature after heating of the inner shells 4, the temperature, humidity, vacuum degree and whether there is sodium leakage inside the first outer shell 1 and the second outer shell 2.

[0019] Specifically, as Figure 1 shown, two groups of connectors 5 are arranged on the periphery of the connection part of the first outer shell 1 and the second outer shell 2. The two groups of connectors 5 are symmetrically arranged. The ends of the two groups of connectors 5 are connected by fasteners. Sealing gaskets are arranged on the sides of the connectors 5 close to the first outer shell 1 and the second outer shell 2. The connectors 5 can be hoop clamps or other components capable of connecting the first outer shell 1 and the second outer shell 2. The fasteners can be bolts and nuts. The two groups of connectors 5 are used to connect the two groups of first outer shells 1 and the two groups of second outer shells 2 into a whole, ensuring the tightness of the connection between the two groups of first outer shells 1 and the two groups of second outer shells 2, and at the same time facilitating the maintenance and replacement of the first outer shell 1, the second outer shell 2 and related internal components.

[0020] Specifically, as Figure 2 and Figure 3As shown in the figure, both ends of the first outer shell 1 are provided with first end faces 11. The center of the first end face 11 is arranged in a stepped shape. A first air exchange hole 12 is opened on the first end face 11. Two groups of first outer shells 1 are fixedly connected to each other on the opposite side by a first support surface 13. A second air exchange hole 14 is opened on the first support surface 13. A number of first inner supports 15 are fixedly connected inside the first outer shell 1. The top of the first outer shell 1 at the upper position is fixedly connected with a first air exchange port 16. The bottom of the first outer shell 1 at the lower position is fixedly connected with a second air exchange port 17. The center of the first end face 11 is fixedly connected with a middle heat insulation layer 18. The middle heat insulation layer 18 is a hollow structure. Heat insulation materials are filled inside the middle heat insulation layer 18. The radial cross-section of the middle heat insulation layer 18 is fan-shaped; Specifically, as Figures 4-6 shown, a high-temperature resistant heat insulation cloth 21 is arranged between the second outer shell 2 and the first end face 11 of the first outer shell 1. The structure of the second outer shell 2 is the same as that of the first outer shell 1, but the length of the second outer shell 2 is greater than that of the first outer shell 1. The lengths of the inner shell, the middle heat insulation layer, and the first outer shell inside the first outer shell are arranged in decreasing order in sequence; the lengths of the inner shell, the middle heat insulation layer, and the second outer shell inside the second outer shell are arranged in increasing order in sequence; in the axial direction of the target pipeline, the inner shells and the middle heat insulation layers of two adjacent groups on the same side are continuously penetrated. In the radial direction of the target pipeline, the inner shells and the middle heat insulation layers inside the first outer shell and the inner shells and the middle heat insulation layers inside the second outer shell form a stepped connection with equal-length staggered fitting.

[0021] It should be noted that the high-temperature resistant heat insulation cloth 21 can be made of fiberglass cloth.

[0022] As Figure 6 and Figure 7 shown, both ends of the inner shell 4 are provided with first sliding grooves 41. An inner heat insulation layer 42 is slidably connected inside the first sliding grooves 41. The first sliding grooves 41 are attached to the target pipeline 3. The inner heat insulation layer 42 is fixed at the fan-shaped center of the middle heat insulation layer 18; In actual operation, two groups of inner shells 4 are attached to the target pipeline 3. The inner thermal insulation layer 42 is arranged on the periphery of the inner shell 4, the middle thermal insulation layer 18 is on the periphery of the inner shell 4, and the first outer shell 1 and the second outer shell 2 are on the periphery of the middle thermal insulation layer 18. The two groups of the first outer shell 1 and the second outer shell 2 are arranged on the periphery of the target pipeline 3, and the first outer shell 1 and the second outer shell 2 are alternately arranged in the axial direction of the target pipeline 3, so that the first end face 11, the first support surface 13 on the first outer shell 1 and the second outer shell 2 and the middle thermal insulation layer 18 are in contact with each other. The inner shell 4 and the inner thermal insulation layer 42 can be connected at the axial ends. At the same time, the connected first support surface 13 can also ensure that a sealed space is formed between the inner shell 4 and the inner thermal insulation layer 42. After the first outer shell 1 and the second outer shell 2 are aligned, the connecting piece 5 and the fastener are used to connect the first outer shell 1 and the second outer shell 2 into a whole. At this time, in the axial direction of the target pipeline 3, the sealed spaces formed by the inner shell 4 and the inner thermal insulation layer 42, the sealed space formed by the first support surface 13, and the sealed spaces formed by the first outer shell 1 and the second outer shell 2, and the connection part is in a stepped shape, which is beneficial to preventing heat from dissipating from the connection part, thereby improving the heat preservation effect of the heat preservation device.

[0023] Specifically, as Figures 6-9 shown, a number of buffer components 43 are arranged between the first chute 41 and the inner thermal insulation layer 42. By setting the first chute 41 to be slidably connected to the inner thermal insulation layer 42 and arranging the buffer components 43 inside the first chute 41 and the inner thermal insulation layer 42, the first chute 41 can be made to fit the target pipeline 3 more closely, and the first chute 41 can fit target pipelines 3 with different diameters, improving the applicability of the heat preservation device. At the same time, when the target pipeline 3 conveys the medium, the buffer components 43 can buffer the periodic stress generated by pressure fluctuations, fluid impacts or mechanical vibrations, so that the buffer components 43 can reduce the influence of stress on the sealing performance.

[0024] It should be noted that heat preservation materials are arranged on the opposite sides of the two groups of middle thermal insulation layers 18 to ensure that the opposite sides of the middle thermal insulation layers 18 are in a sealed state; the inner shell 4 is made of soft metal and can adapt to and fit the outer surface of the target pipeline 3.

[0025] Furthermore, as Figure 9 shown, the buffer component 43 includes a support frame 431, a second inner support 433, a spring 437 and a telescopic rod 438. The support frame 431 is fixed to the outer wall of the inner shell 4. A number of second chutes 432 and limit holes 4310 are formed on the support frame 431. A second inner support 433 is fixedly connected inside the inner thermal insulation layer 42. A third chute 434 is formed on the second inner support 433. A first slider 435 is arranged in the second chute 432, and the first slider 435 is slidably connected to the second chute 432. A second slider 436 is arranged in the third chute 434, and the second slider 436 is slidably connected to the third chute 434. The positions of the support frame 431 and the second inner support 433 correspond to each other, and the positions of the second chute 432 and the third chute 434 correspond to each other; The telescopic rod 438 and the spring 437 are fixed between the first slider 435 and the second slider 436. The spring 437 is arranged outside the telescopic rod 438, and a plurality of air holes 439 are arranged on the telescopic rod 438.

[0026] In actual operation, when periodic stress is generated due to pressure fluctuation, fluid impact or mechanical vibration during medium transportation, since the inner shell 4 fits the target pipeline 3, the stress generated is transmitted to the inner shell 4 through the target pipeline 3. The inner shell 4 deforms under the action of the stress, and then the force generated during the deformation of the inner shell 4 is transmitted to the buffer assembly 43. Since the inner thermal insulation layer 42 slides in the first chute 41 at the end of the inner shell 4, the inner shell 4 can adapt to the deformation generated by the target pipeline 3 under the action of stress, thereby ensuring relative sealing between the first chute 41 and the inner shell 4; due to the stress being periodic or fluctuating, the inner shell 4 will generate alternating deformation towards the inner thermal insulation layer 42 side and towards the target pipeline 3 side. When the inner shell 4 deforms towards the inner thermal insulation layer 42 side, the spring 437 in the buffer assembly 43 compresses, and the telescopic rod 438 shortens, causing the gas inside the telescopic rod 438 to be discharged through the air holes 439. When the inner shell 4 deforms towards the target pipeline 3 side, the spring 437 in the buffer assembly 43 stretches, and the telescopic rod 438 elongates, causing the telescopic rod 438 to inhale the gas between the inner shell 4 and the inner thermal insulation layer 42 through the air holes 439, thereby promoting the gas flow between the inner shell 4 and the inner thermal insulation layer 42. The spring 437 can absorb the force generated during the fluctuation, and at the same time assist the inner shell 4 to maintain a relatively stable position under the pressure and elastic force of the spring 437, thereby further ensuring relative sealing between the first chute 41 and the inner shell 4 and avoiding heat dissipation.

[0027] Specifically, as Figure 2 、 Figure 7 and Figure 8 shown, the monitoring assembly 7 includes a thermocouple 71, a temperature and humidity sensor 72, a vacuum degree detector 73 and a sodium leakage insulator 74. The thermocouple 71 is connected to the inner shell 4, the temperature and humidity sensor 72 and the vacuum degree detector 73 are fixed on the inner walls of the first outer shell 1 and the second outer shell 2, and the sodium leakage insulator 74 is fixed at the bottom of the inner shell 4. The thermocouple 71 is used to detect the temperature of the inner shell 4 after being heated by the heating assembly 6, the temperature and humidity sensor 72 is used to detect the temperature and humidity inside the first outer shell 1 and the second outer shell 2, the vacuum degree detector 73 is used to detect the vacuum degree inside the first outer shell 1 and the second outer shell 2, and the sodium leakage insulator 74 is used to detect whether there is liquid sodium leakage, thereby improving the safety of the heat preservation device; It should be noted that when there is no leakage, the closed space formed by the first outer shell 1 and the second outer shell 2 is only the space area between the outer wall of the middle thermal insulation layer 18 and the inside of the first outer shell 1 and the second outer shell 2.

[0028] The monitoring component 7 is signal-connected to a monitoring module. The monitoring module is used to collect and monitor the temperature of the inner shell 4 after being heated by the heating component 6, the temperature, humidity, vacuum degree inside the first outer shell 1 and the second outer shell 2, and whether there is sodium leakage. Then, it makes a safety monitoring judgment based on the collected results, and controls relevant equipment for adjustment according to the judgment results. The monitoring module is also signal-connected to the heating component 6 and the regulation component 8.

[0029] Specifically, as Figure 2 and Figure 9 shown, the heating component 6 includes a heating wire 61. The heating wire 61 is arranged on the outer surface of the inner shell 4 and is arranged in the limiting hole 4310 on the support frame 431. Both ends of the heating wire 61 are connected with a single-core terminal 62. In actual use, the single-core terminal 62 is connected to the power supply to ensure the normal operation of the heating wire 61, heat the inner shell 4, and then transfer the heat to the medium inside the target pipeline 3 through the heated inner shell 4, improving the uniformity of the temperature rise inside the target pipeline 3.

[0030] As Figure 1 、 Figure 6 and Figure 10 shown, the regulation component 8 includes a dehumidifier 81, a fan 82 and a three-way valve 83. A first branch pipeline 84 is connected to the second ventilation port 17 at the bottom of the first outer shell 1 and the second outer shell 2. A second branch pipeline 86 is connected to the first ventilation port 16 at the top of the first outer shell 1 and the second outer shell 2. The first branch pipeline 84 is connected to a main pipeline 85. The dehumidifier 81, the fan 82 and the three-way valve 83 are arranged on the main pipeline 85. The three-way valve 83 includes a set of inlets and two sets of outlets. The main pipeline 85 is connected to the inlet and one set of outlets of the three-way valve 83. The other set of outlets of the three-way valve 83 is used for emptying. Solenoid valves 87 are arranged on both the first branch pipeline 84 and the second branch pipeline 86.

[0031] In actual operation, when the humidity inside the first housing 1 and the second housing 2 is high, a dehumidification operation is performed. Specifically, the dehumidifier 81 and the blower 82 are started, the outlet of the three-way valve 83 connected to the main pipeline 85 is opened, the outlet for evacuation on the three-way valve 83 is closed, and the solenoid valves 87 on the first branch pipeline 84 and the second branch pipeline 86 are opened. The blower 82 extracts the high-humidity gas inside the first housing 1 and the second housing 2. After the high-humidity gas is dehumidified by the dehumidifier 81, it re-enters the first housing 1 and the second housing 2, promoting the replacement of the high-humidity gas and the dry gas inside the first housing 1 until the humidity inside the first housing 1 and the second housing 2 decreases and drops below the humidity set value; when the vacuum degree inside the first housing 1 and the second housing 2 is high, a vacuum pumping operation is performed. Specifically, the blower 82 is started, the outlet of the three-way valve 83 connected to the first ventilation port 16 is closed, the outlet for evacuation on the three-way valve 83 is opened, and the solenoid valves 87 on the first branch pipeline 84 and the second branch pipeline 86 are closed. The inside of the first housing 1 and the second housing 2 is evacuated until the vacuum degree inside the first housing 1 and the second housing 2 is lower than the vacuum degree set value. The specific humidity set value and vacuum degree set value are set manually according to the application environment, so as to ensure that the enclosed space formed after the connection of the first housing 1 and the second housing 2 is in a vacuum state, guarantee the heat preservation and heat insulation effect of the heat preservation device, and also avoid the high-humidity environment inside the first housing 1 and the second housing 2, resulting in condensation water reducing the heat preservation and heat insulation performance of the first housing 1 and the second housing 2, and the water vapor in the high-humidity environment reacting with the leaked transmission medium, resulting in potential safety hazards.

[0032] Working method of the electric heating integrated heat preservation device: Step 1: Preheat the heat preservation device before transmission. The single-core terminal 62 is connected to the power supply, and the inner shell 4 is heated by the heating wire 61, and then the target pipeline 3 and the medium inside the target pipeline 3 are heated through the inner shell 4; Step 2: The buffer assembly 43 absorbs the stress generated during the transmission of the medium and makes an adaptive position adjustment on the basis of ensuring sealing; Step 3: During the transmission of the medium, the monitoring module obtains the data detected by the monitoring component 7, performs a safety monitoring judgment, and controls the heating component 6 and the regulation component 8 to make adjustments according to the judgment result; Specifically, the monitoring module obtains the temperatures of the inner shell 4 after heating corresponding to the first housing 1 and the second housing 2 respectively, the temperature, humidity, and vacuum degree inside the first housing 1 and the second housing 2, whether there is liquid sodium leakage inside the inner heat preservation layer 42, and calculates the temperature difference between the temperatures inside the first housing 1 and the second housing 2 and the corresponding inner shell 4. After the inner shell 4 is heated by the heating component 6, the temperatures of the first housing 1 and the second housing 2 are respectively denoted as t 1 and t 2 , and the temperature differences between the first housing 1, the second housing 2 and the inner shell 4 inside them are respectively denoted as ∆t1 and ∆t 2 , the humidity inside the first outer shell 1 and the second outer shell 2 is RH 1 and RH 2 , the vacuum degrees inside the first outer shell 1 and the second outer shell 2 are Pa 1 and Pa 2 .

[0033] It should be noted that for the convenience of subsequent description, t 1 and t 2 are collectively referred to as t, and ∆t 1 and ∆t 2 are collectively referred to as ∆t, RH 1 and RH 2 are collectively referred to as RH, and Pa 1 and Pa 2 are collectively referred to as Pa; In the monitoring module, there are set temperature thresholds, temperature difference thresholds, humidity thresholds, and vacuum degree thresholds that meet the requirements for the medium transmission regulation in the target pipeline 3. Since the inner shell 4 is in contact with the target pipeline 3, the temperature threshold that meets the medium transmission in the target pipeline 3 is the temperature threshold that the inner shell 4 needs to meet. The temperature threshold is denoted as T, and T is the allowable minimum temperature. The temperature threshold T is used to determine whether the heating component 6 needs to heat the inner shell 4; the temperature difference threshold is denoted as ∆T, and ∆T is the allowable maximum temperature difference. The temperature difference threshold ∆T is used to determine whether there is a situation of incomplete sealing and heat dissipation inside the first outer shell 1 and the second outer shell 2; the humidity threshold is denoted as RH max , RH max is the maximum humidity during the operation of the heat preservation device inside the first outer shell 1 and the second outer shell 2. The humidity threshold RH max is used to determine whether there is incomplete sealing in the first outer shell 1 and the second outer shell 2 itself, resulting in the entry of water vapor when the heat preservation device stops; the vacuum degree threshold is denoted as Pa max , and the vacuum degree threshold is that F is the allowable maximum vacuum degree during the operation of the heat preservation device. The vacuum degree threshold is used to determine whether there is incomplete sealing in the first outer shell 1 and the second outer shell 2 itself.

[0034] When it is detected that there is a leakage of liquid sodium, the monitoring module gives an alarm prompt. When no leakage of liquid sodium is detected, subsequent detections continue; Situation ①: When t≥T and ∆t<∆T, it means that the temperature of the inner shell 4 meets the requirements for the medium transmission in the target pipeline 3, and there is no situation of incomplete sealing inside the first outer shell 1 and the second outer shell 2. The heat preservation device can provide a good heat preservation effect, and the heating component 6 stops heating the inner shell 4; Case ②: When t≥T and ∆t≥∆T, the temperature of the inner shell 4 meets the requirements for the medium transmission in the target pipeline 3, but there are some parts in the first outer shell 1 and the second outer shell 2 that are not completely sealed. As a result, the heat generated during the heating by the heating component 6 is dissipated between the inner shell 4 and the inner thermal insulation layer 42, reducing the insulation effect. The monitoring module gives an alarm prompt, and the maintenance personnel carry out maintenance. Case ③: When t<T, the temperature of the inner shell 4 does not meet the requirements for the medium transmission in the target pipeline 3. The heating component 6 heats the inner shell 4. If it still cannot reach t≥T after long-term heating, an alarm prompt is given. The specific heating time is set manually.

[0035] Based on the above detections, if RH≤RH max , Pa≤Pa max , it means that the humidity and vacuum degree inside the insulation device are normal, and the insulation device is normal, capable of providing the maximum insulation effect. If RH>RH max , a dehumidification operation is carried out to reduce the insulation performance degradation caused by the high humidity inside the first outer shell 1 and the second outer shell 2, which generates condensate water, and the reaction between the water vapor in the high-humidity environment and the leaked transmission medium, resulting in potential safety hazards. At the same time, it is also necessary to reduce the convective heat dissipation generated during gas replacement. Therefore, a dehumidification operation time is set in the monitoring module. During the dehumidification operation time, when the inside of the first outer shell 1 and the second outer shell 2 reaches RH≤RH max , it means that the self-sealing performance of the first outer shell 1 and the second outer shell 2 is good. If after reaching the dehumidification operation time, the inside of the first outer shell 1 and the second outer shell 2 is still RH>RH max , it means that the first outer shell 1 and the second outer shell 2 are not completely self-sealed, and the monitoring module gives an alarm prompt.

[0036] If Pa>Pa max , a vacuum pumping operation is carried out to avoid the low vacuum degree inside the first outer shell 1 and the second outer shell 2, or even the vacuum degree of the environment, approaching the ambient pressure, resulting in macroscopic gas flow inside the first outer shell 1 and the second outer shell 2, generating convective heat dissipation and reducing the thermal insulation performance of the insulation device. At the same time, it is also necessary to reduce the convective heat dissipation generated during gas replacement when pumping to vacuum. Therefore, a vacuum pumping operation time is set in the monitoring module. During the vacuum pumping operation time, when the inside of the first outer shell 1 and the second outer shell 2 reaches Pa≤Pa max , it means that the self-sealing performance of the first outer shell 1 and the second outer shell 2 is good. If after reaching the dehumidification operation time, the inside of the first outer shell 1 and the second outer shell 2 is still Pa>Pa max , it means that the first outer shell 1 and the second outer shell 2 are not completely self-sealed, and the monitoring module gives an alarm prompt.

[0037] It should be noted that the heating component 6 and the regulation component 8 can operate simultaneously, which is conducive to ensuring the heat preservation effect of the heat preservation device; when the RH inside the first outer shell 1 and the second outer shell 2 is greater than RH max , Pa is greater than Pa max When both exist at the same time, in order to further reduce the convective heat dissipation generated by the dehumidification operation and the vacuum pumping operation, the vacuum pumping operation is carried out after half of the dehumidification operation time of the dehumidification operation; the "magnitude" of the vacuum degree value and the "height" of the vacuum degree are in an inverse relationship.

[0038] By the above steps, by setting the first outer shell 1, the second outer shell 2, the inner shell 4, the buffer component 43, the heating component 6, and the monitoring component 7, it is possible to absorb the stress fluctuations generated during the medium transmission process, and make an adaptive position adjustment based on the stress fluctuation situation without affecting the direct sealing performance between the inner shell 4 and the inner heat preservation layer 42. It is also possible to detect the temperature and humidity, vacuum degree inside the first outer shell 1 and the second outer shell 2 before, during, and after the medium transmission, and whether there is sodium leakage between the inner heat preservation layer 42 and the inner shell 4, thereby improving the safety during the operation of the heat preservation device.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0040] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric heating integrated heat preservation device, comprising two groups of first outer shells (1), two groups of second outer shells (2), a target pipeline (3), four groups of inner shells (4), and a monitoring component (7), characterized in that: The inner shell (4) is arranged inside the first outer shell (1) and the second outer shell (2); each two groups of inner shells (4) located in the radial direction of the target pipeline (3) are symmetrically arranged on the periphery of the target pipeline (3); the two groups of inner shells (4) located in the axial direction of the target pipeline (3) correspond to the positions of the first outer shell (1) and the second outer shell (2), respectively; the first outer shell (1) and the second outer shell (2) are connected; the monitoring component (7) is arranged inside the first outer shell (1) and the second outer shell (2); the four groups of inner shells (4) have the same length; the monitoring component (7) is used to monitor the temperature of the inner shell (4) after heating, the temperature, humidity, vacuum degree and whether there is sodium leakage inside the first outer shell (1) and the second outer shell (2); First slide grooves (41) are provided at both ends of the inner shell (4), an inner thermal insulation layer (42) is slidably connected in the first slide groove (41), and a plurality of buffer components (43) are provided between the first slide groove (41) and the inner thermal insulation layer (42); The monitoring component (7) comprises a thermocouple (71), a temperature and humidity sensor (72), a vacuum detector (73) and a sodium leakage insulator (74); the monitoring component (7) is signal-connected to a monitoring module; and the monitoring module is signal-connected to a heating component (6) and a regulating component (8).

2. The electric heating integrated thermal insulation device according to claim 1, characterized in that: Two groups of connecting members (5) are arranged at the periphery of the connection between the first shell (1) and the second shell (2), the two groups of connecting members (5) are arranged symmetrically, the ends of the two groups of connecting members (5) are connected by fasteners, and a sealing gasket is arranged on one side of the connecting member (5) close to the first shell (1) and the second shell (2).

3. The electric heating integrated thermal insulation device according to claim 1, characterized in that: The first shell (1) is provided with first end surfaces (11) at both ends, the center of the first end surface (11) is arranged in a stepped shape, a first ventilation hole (12) is opened on the first end surface (11), a first support surface (13) is fixedly connected to the opposite side of the two groups of the first shells (1), the first support surface (13) is provided with a second ventilation hole (14), a plurality of first inner supports (15) are fixedly connected inside the first shell (1), a first ventilation port (16) is fixedly connected to the top of the first shell (1) located at an upper position, and a second ventilation port (17) is fixedly connected to the bottom of the first shell (1) located at a lower position, a middle insulation layer (18) is fixedly connected to the center of the first end surface (11), the middle insulation layer (18) is a hollow structure, the radial cross section of the middle insulation layer (18) is a fan-shaped, and the inner insulation layer (42) is fixed to the center of the fan-shaped middle insulation layer (18).

4. The electric heating integrated heat preservation device according to claim 3, characterized in that: A high temperature resistant heat insulating cloth (21) is provided between the second shell (2) and the first end surface (11) of the first shell (1); the structure of the second shell (2) is the same as that of the first shell (1), but the length of the second shell (2) is greater than that of the first shell (1); The length of the inner shell (4) inside the first outer shell (1), the length of the middle insulation layer (18), and the length of the first outer shell (1) are arranged in descending order; The length of the inner shell (4) inside the second outer shell (2), the length of the middle insulation layer (18), and the length of the second outer shell (2) are arranged in increasing order; In the axial direction of the target pipeline (3), two adjacent groups of inner shells (4) and middle thermal insulation layers (18) on the same side are continuously connected, and in the radial direction of the target pipeline (3), the inner shell (4) and middle thermal insulation layer (18) inside the first outer shell (1) and the inner shell (4) and middle thermal insulation layer (18) inside the second outer shell (2) form a stepped connection with equal lengths and staggered interlocking.

5. The electric heating integrated heat preservation device according to claim 4, characterized in that: The buffer assembly (43) comprises a support frame (431), a second inner support (433), a spring (437) and a telescopic rod (438); the support frame (431) is fixed to the outer wall of the inner shell (4); a plurality of second slide grooves (432) and limiting holes (4310) are provided on the support frame (431); the second inner support (433) is fixedly connected to the inside of the inner thermal insulation layer (42); the second inner support (433) is provided with a third slide groove (434); a first slider (435) is provided in the second slide groove (432); the first slider (435) is slidably connected to the second slide groove (432); a second slider (436) is provided in the third slide groove (434); the second slider (436) is slidably connected to the third slide groove (434).

6. The electric heating integrated heat preservation device according to claim 5, characterized in that: The telescopic rod (438) and the spring (437) are fixed between the first slider (435) and the second slider (436); the spring (437) is arranged on the periphery of the telescopic rod (438); and a plurality of air holes (439) are arranged on the telescopic rod (438).

7. The electric heating integrated heat preservation device according to claim 6, characterized in that: The thermocouple (71) is connected to the inner shell (4), the temperature and humidity sensor (72) and the vacuum detector (73) are fixed to the inner walls of the first outer shell (1) and the second outer shell (2), and the sodium leakage insulator (74) is fixed to the bottom of the inner shell (4).

8. The electric heating integrated heat preservation device according to claim 7, characterized in that: The heating component (6) comprises a heating wire (61), the heating wire (61) being arranged on the outer surface of the inner shell (4), the heating wire (61) being arranged in a limiting hole (4310) on the support frame (431), and single-core terminators (62) being connected at both ends of the heating wire (61).

9. The electric heating integrated heat preservation device according to claim 8, characterized in that: The control component (8) comprises a dehumidifier (81), a fan (82) and a three-way valve (83); the second ventilation port (17) at the bottom of the first shell (1) and the second shell (2) is connected to a first branch pipeline (84); the first ventilation port (16) at the top of the first shell (1) and the second shell (2) is connected to a second branch pipeline (86); the first branch pipeline (84) is connected to a main pipeline (85); and the dehumidifier (81), the fan (82) and the three-way valve (83) are arranged on the main pipeline (85); The three-way valve (83) comprises a group of inlets and two groups of outlets. The main pipeline (85) is connected to the inlet of the three-way valve (83) and one group of outlets. The other group of outlets of the three-way valve (83) is used for emptying. The first branch pipeline (84) and the second branch pipeline (86) are both provided with solenoid valves (87).

10. The electric heating integrated heat preservation device according to claim 9, characterized in that: The working method of the electric heating integrated thermal insulation device is: Step 1: preheating the heat preservation device before transmission, the single-core terminator (62) is connected to a power source, the heating wire (61) heats the inner shell (4), and then the target pipe (3) and the medium inside the target pipe (3) are heated through the inner shell (4); Step 2: The buffer component (43) absorbs the stress generated during the transmission of the medium and performs adaptive position adjustment on the basis of ensuring sealing; Step 3: During medium transmission, the monitoring module obtains the data detected by the monitoring component (7), performs safety monitoring judgment, and controls the heating component (6) and the regulating component (8) to make adjustments based on the judgment result.

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