Electric heating device capable of quickly replacing heating element
Patent Information
- Application Number
- CN202520504474.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-21
AI Technical Summary
[0005]本实用新型要解决的技术问题是为了克服现有技术中电加热器直接预设在保温层内部，损坏时无法维修或更换的缺陷，提供一种可快速更换加热件的电加热装置
[0025]较佳地，所述筒状结构由至少两瓣分体结构组合而成，至少两瓣所述分体结构依次首尾相接以拼接形成完整的筒状结构。
Smart Images
Figure CN223942853U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nuclear reactors, and in particular to an electric heating device with a rapidly replaceable heating element. Background Technology
[0002] Electric heating devices are common heating equipment whose core function is to convert electrical energy into heat energy. In the field of nuclear reactors, electric heating devices are widely used to heat pipes and containers that contain high-temperature heat transfer media within the reactor. By using preheating equipment, the temperature difference between the high-temperature heat transfer media and the equipment can be reduced, thereby avoiding damage to the equipment caused by thermal stress due to large temperature changes. In addition, heating equipment can prevent the solidification of high-melting-point heat transfer media inside the equipment.
[0003] Commonly used electric heating devices typically employ heating wires as the heating element. These wires are connected to a power source via conductors and generate heat when energized. The heating wire is usually surrounded by a heat-conducting outer tube, ceramic insulation, or other heat-conducting components to isolate the wire from the target being heated and to ensure even heat distribution. Furthermore, by combining heating wires with heat-conducting components of different structures, heaters can be manufactured in various forms, such as tubular, tracked, or rope-type heaters. These heaters can be customized to the shape and size of the target being heated and heated in close contact with it through splicing, bending, or winding.
[0004] However, electric heating wires operate at high temperatures, and prolonged operation may cause the electric heater to malfunction. Therefore, electric heating devices requiring long-term operation typically require replaceable and maintainable heaters. However, most existing electric heating devices in the nuclear reactor field use a design where the heater is directly embedded inside the insulation layer. Once the heater is damaged, it cannot be quickly repaired or replaced. This inability to quickly replace the heater could lead to reactor shutdowns and significant economic losses. Furthermore, existing electric heating devices have limitations in structural design, making it difficult to meet the specific requirements of the nuclear reactor field for rapid replacement, compact structure, and functional integration. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art in which the electric heater is directly preset inside the insulation layer and cannot be repaired or replaced when damaged, and to provide an electric heating device in which the heating element can be quickly replaced.
[0006] The present invention solves the above-mentioned technical problems through the following technical solution:
[0007] An electric heating device with a quickly replaceable heating element is used to heat a target object containing a high-temperature heat transfer medium in a nuclear reactor. The electric heating device includes:
[0008] Heating element;
[0009] A heat conductor, which is a cylindrical structure, is used to wrap the target to be heated. The heat conductor has a channel on its side wall, which extends from one end of the heat conductor along the axial direction of the heat conductor. The heating element is detachably inserted into the channel.
[0010] A heat insulation layer is disposed on the outer periphery of the heat conductor.
[0011] In this technical solution, by setting a channel extending axially from one end of the heat conductor on the heat conductor, the heating element is detachably inserted into the channel. When the heating element is damaged, it can be removed from the channel and replaced with a new heating element, thereby realizing the rapid maintenance of the electric heating device and avoiding the entire electric heating device becoming unusable due to the damage of the heating element.
[0012] Meanwhile, by wrapping the heated target with a heat conductor made of a material with good thermal conductivity, the heat conductor evenly transfers the heat generated by the heating element to the heated target, making the heated target uniformly heated. By setting a heat insulation layer on the outer periphery of the heat conductor to insulate the heating element and the heat conductor, heat loss is reduced. The heating, heat conduction and heat insulation of the electric heating device are integrated. The overall structure of the electric heating device is compact, thus meeting the heating requirements of high-temperature equipment.
[0013] Preferably, there are multiple channels and multiple heating elements, and the multiple heating elements and multiple channels are arranged in a one-to-one correspondence, and the multiple channels are evenly distributed along the circumference of the heat conductor.
[0014] In this technical solution, by setting multiple channels evenly distributed along the circumference on the heat conductor, multiple heating elements can be inserted into each channel, thereby increasing the heat output of the electric heating device and making the heated target more uniformly heated.
[0015] Preferably, the cross-sectional shape of the heating element matches the cross-sectional shape of the channel, and the size of the channel is larger than the size of the heating element.
[0016] In this technical solution, by setting the size of the channel to be larger than the size of the heating element, on the one hand, the heating element is easier to insert into the channel during the process of inserting the heating element; on the other hand, the heating element may deform due to long-term heating during use, and after the heating element is damaged, the relatively larger channel makes it easier to remove and replace the heating element.
[0017] Preferably, the difference between the size of the heating element and the size of the channel is less than 0.5 cm.
[0018] Preferably, along the axial direction of the heat conductor, the size of the heat conductor is not less than the size of the target being heated, and the size of the channel is equal to or less than the size of the target being heated.
[0019] In this technical solution, by setting the size of the heat conductor to be no smaller than the size of the target being heated, the target being heated can be fully covered by the heat conductor, thus improving the heating effect. The axial dimension of the channel is set to be equal to or smaller than the target being heated because, when the heat conductor has good thermal conductivity, the size of the heating element can be smaller than the size of the target being heated, which can achieve a good heating effect on the target being heated, while reducing the difficulty of device processing.
[0020] Preferably, along the axial direction of the heat conductor, the size of the heating element is not smaller than the size of the channel.
[0021] In this technical solution, the axial dimension of the heating element is set to be no less than the axial dimension of the channel, and a non-heating section is reserved outside the channel to facilitate the disassembly and replacement of the heating element. The heating section of the heating element is placed entirely inside the channel to avoid empty parts inside the channel and improve the heat transfer effect between the heating element and the heat conductor.
[0022] Preferably, there is a gap between the inner peripheral side of the heat conductor and the outer peripheral side of the heated target.
[0023] In this technical solution, by setting a gap between the inner circumference of the heat conductor and the outer circumference of the target to be heated, the installation of the target to be heated is facilitated.
[0024] Preferably, the difference between the outer peripheral dimension of the heated target and the inner peripheral dimension of the heat conductor is less than 0.5 cm.
[0025] Preferably, the cylindrical structure is composed of at least two separate structures, which are joined end to end to form a complete cylindrical structure.
[0026] Preferably, the first end of each of the split structures has a protrusion extending along the axial direction of the heat conductor, and the tail end of each of the split structures has a groove that matches the protrusion, with the protrusion embedded in an adjacent groove.
[0027] The positive and progressive effects of this utility model are as follows: by setting a channel extending axially from one end of the heat conductor on the heat conductor, the heating element can be detachably inserted into the channel. When the heating element is damaged, it can be removed from the channel and replaced with a new heating element, thereby realizing the rapid maintenance of the electric heating device and avoiding the entire electric heating device becoming unusable due to the damage of the heating element.
[0028] Meanwhile, by wrapping the heated target with a heat conductor made of a material with good thermal conductivity, the heat conductor evenly transfers the heat generated by the heating element to the heated target, making the heated target uniformly heated. By setting a heat insulation layer on the outer periphery of the heat conductor to insulate the heating element and the heat conductor, heat loss is reduced. The heating, heat conduction and heat insulation of the electric heating device are integrated. The overall structure of the electric heating device is compact, thus meeting the heating requirements of high-temperature equipment. Attached Figure Description
[0029] Figure 1 This is a cross-sectional schematic diagram (I) of the electric heating device of Embodiment 1 of this utility model.
[0030] Figure 2 This is a cross-sectional schematic diagram (II) of the electric heating device of Embodiment 1 of this utility model.
[0031] Figure 3 This is a side view of the electric heating device according to Embodiment 1 of this utility model.
[0032] Figure 4 This is a three-dimensional structural diagram of the split structure of Embodiment 1 of this utility model.
[0033] Figure 5 This is a cross-sectional view of the electric heating device and the wall in Embodiment 1 of this utility model.
[0034] Figure 6 This is a three-dimensional structural diagram of the split structure of Embodiment 2 of this utility model.
[0035] Explanation of reference numerals in the attached figures:
[0036] Target being heated 100
[0037] Heating element 1
[0038] Gap 201
[0039] Heatsink 2
[0040] 21 ducts
[0041] Split structure 202
[0042] Groove 22
[0043] 23 protrusions
[0044] Insulation layer 3
[0045] Wall 200 Detailed Implementation
[0046] Two preferred embodiments are described below, along with accompanying drawings, to illustrate the present invention more clearly and completely.
[0047] Example 1
[0048] like Figures 1-5 As shown, this embodiment provides an electric heating device with a quickly replaceable heating element. This electric heating device is used to heat pipes that transport high-temperature heat transfer media in a nuclear reactor; that is, in this embodiment, the target to be heated 100 is the pipe. The electric heating device includes a heating element 1, a heat conductor 2, and a heat insulation layer 3. The heat conductor 2 has a cylindrical structure and is used to enclose the target to be heated 100. A channel 21 is provided on the side wall of the heat conductor 2, extending axially from one end of the heat conductor 2. The heating element 1 is detachably inserted into the channel 21. The heat insulation layer 3 is disposed on the outer periphery of the heat conductor 2. By providing a channel 21 extending axially from one end of the heat conductor 2 on the heat conductor 2, and detachably inserting the heating element 1 into the channel 21, when the heating element 1 is damaged, it can be removed from the channel 21 and replaced with a new heating element 1. This achieves rapid maintenance of the electric heating device and avoids the entire electric heating device becoming unusable due to damage to the heating element 1.
[0049] Meanwhile, the target 100 to be heated is wrapped by the heat conductor 2, which is made of a material with good thermal conductivity. The heat conductor 2 evenly transfers the heat generated by the heating element to the target 100, so that the target 100 is heated evenly. By setting the heat insulation layer 3 on the outer periphery of the heat conductor 2 to insulate the heating element 1 and the heat conductor 2, heat loss is reduced. The heating, heat conduction and heat insulation of the electric heating device are integrated. The overall structure of the electric heating device is compact, thus meeting the heating requirements of the high-temperature target 100.
[0050] Specifically, when using this electric heating device to heat a pipeline that transmits a high-temperature medium, the entire electric heating device can be pre-embedded in the wall 200, with one end of the heat conductor 2 facing the outside of the wall 200, so that those skilled in the art can easily repair or replace the heating element 1.
[0051] Meanwhile, the outer diameter of the pipe to be heated is approximately 10cm, passing through a concrete wall hole with an outer diameter of approximately 40cm, and the concrete wall thickness can reach 200cm. The thickness of the heat conductor 2 can be 3-5cm, possessing good thermal conductivity. Depending on the application scenario, the heat conductor 2 can be made of materials with relatively good thermal conductivity, such as alloys, carbon steel, and stainless steel. The heating element 1 can be a rigid long tube-shaped heating element or a flexible rope-shaped heating wire. The heat conductor 2 is wrapped with heat insulation material to form a heat insulation layer 3, which is mainly used to insulate the heat emitted by the heating element 1 and ensure that the external structure of the electric heating device, such as the wall 200, is maintained at a low temperature level. According to the temperature of the target 100 being heated, the temperature limit of the external structure, and the reserved space of the electric heating device, the radial dimension of the heat insulation layer 3 can be adjusted, and the structure of the heat insulation layer 3 can be selected from a single material or an optimized combination of multiple materials, which will not be elaborated here.
[0052] Of course, in other embodiments, the heated target 100 can also be other equipment that needs to be heated, such as a tank, etc., which will not be described in detail here.
[0053] Specifically, the number of channels 21 and heating elements 1 can be set to multiple, with multiple heating elements 1 and multiple channels 21 arranged in a one-to-one correspondence, and the multiple channels 21 being evenly distributed along the circumference of the heat conductor 2. By setting multiple channels 21 evenly distributed along the circumference on the heat conductor 2, multiple heating elements 1 can be inserted into each channel 21, thereby increasing the heat output of the electric heating device and making the pipe more evenly heated.
[0054] Specifically, in this embodiment, there are 8 heating elements 1 and 8 holes 21.
[0055] Of course, in other embodiments, the number of heating elements 1 can also be adjusted according to the actual demand for heating and the heat that a single heating element 1 can provide, which will not be elaborated here.
[0056] In this embodiment, the cross-sectional shape of the heating element 1 matches the cross-sectional shape of the channel 21, and the size of the channel 21 is larger than the size of the heating element 1. By setting the size of the channel 21 to be larger than the size of the heating element 1, on the one hand, the heating element 1 is easier to insert into the channel 21 during the process of inserting the heating element 1; on the other hand, the heating element 1 may deform due to long-term heating during use, and after the heating element 1 is damaged, the relatively larger size of the channel 21 makes it easier to remove and replace the heating element 1.
[0057] For example, in this embodiment, the heating element 1 is a cylindrical electric heating tube with a circular cross-section, and the cross-section of the channel 21 is also circular, and the diameter of the channel 21 is larger than the diameter of the heating element 1.
[0058] Of course, in other embodiments, the heating element 1 can also be set to other shapes, as long as the size of the channel 21 is larger than the size of the heating element 1, so that the heating element 1 can be disassembled and replaced more conveniently.
[0059] The difference between the size of the heating element 1 and the size of the channel 21 can be determined based on the deformation coefficient of the heating element 1. Specifically, in this embodiment, the difference between the size of the heating element 1 and the size of the channel 21 is 0.5 cm.
[0060] Of course, in other embodiments, the difference between the size of the heating element 1 and the size of the channel 21 can also be set to other values, which can be set to the millimeter or centimeter level depending on the specific needs. This difference only needs to be able to accommodate the deformation of the heating element 1. In the prior art, the heating element 1 is generally made of metal, and its deformation is small. The difference between the size of the heating element 1 and the size of the channel 21 can be set to less than 0.5 cm.
[0061] In this embodiment, along the axial direction of the heat conductor 2, the size of the heat conductor 2 is equal to the size of the pipe, and the size of the channel 21 is smaller than the size of the pipe. By setting the size of the heat conductor 2 to be equal to the size of the pipe, the pipe can be fully covered by the heat conductor 2, improving the heating effect. The size of the channel 21 is set to be smaller than the pipe because, given the good thermal conductivity of the heat conductor 2, the size of the heating element 1 can be smaller than the size of the pipe, which can achieve a good heating effect on the pipe while reducing the processing difficulty.
[0062] Of course, in other embodiments, the size of the heat conductor 2 can be set to be larger than that of the pipe, which can also achieve full coverage of the pipe by the heat conductor 2. At the same time, the axial dimension of the channel 21 can also be set to be no smaller than that of the pipe, which can further improve the heating effect, which will not be elaborated here.
[0063] In this embodiment, the size of the heating element 1 is larger than the size of the channel 21 along the axial direction of the heat conductor 2. The heating element has a heating section and a non-heating section. The heating section is disposed inside the channel, and the non-heating section protrudes axially relative to the heat conductor 2. By setting the axial dimension of the heating element 1 to be larger than the axial dimension of the channel 21, and setting the heating element outside the channel as a non-heating section that does not generate heat, it is convenient to disassemble the heating element. The heating section fills the channel 21, avoiding empty parts inside the channel 21, and improving the heat transfer effect between the heating element 1 and the heat conductor 2.
[0064] Of course, in other embodiments, the axial dimension of the heating element 1 can be set to be equal to the axial dimension of the channel 21, which can also avoid empty parts in the channel 21 and improve the heat transfer effect between the heating element 1 and the heat conductor 2.
[0065] In this embodiment, as Figures 1-3 As shown, there is a gap 201 between the inner circumference of the heat conductor 2 and the outer circumference of the pipe. When the electric heating device is installed in the wall 200 by pre-embedding, and the pipe is installed after the electric heating device is pre-embedded, the gap 201 between the inner circumference of the heat conductor 2 and the outer circumference of the pipe makes it easier to install the pipe.
[0066] Specifically, in this embodiment, the difference between the outer circumference of the pipe and the inner circumference of the heat conductor 2 is 0.5 cm.
[0067] Of course, in other embodiments, the difference between the outer circumference of the pipe and the inner circumference of the heat conductor 2 can also be set to other values. This difference is to allow for the installation of the pipe. The difference does not need to be too large, less than 0.5cm is sufficient.
[0068] Meanwhile, the heat conductor 2 is composed of at least two separate structures 202, which are connected end to end to form a complete cylindrical structure. Each of the two separate structures 202 has a protrusion 23 extending axially along the heat conductor 2 at its head end, and each of the two separate structures 202 has a groove 22 matching the protrusion 23 at its tail end, with the protrusion 23 embedded in adjacent grooves 22.
[0069] Specifically, the number of split structures 202 can be determined according to actual needs. The heat conductor 2 can be set in the form of a multi-lobed split structure 202, such as two-lobed, three-lobed, or four-lobed.
[0070] In this embodiment, as Figure 3 and Figure 4 As shown, the number of segments in the split structure 202 is four.
[0071] By setting the heat conductor 2 as at least two separate structures 202 connected end to end to form a complete cylindrical structure, when the electric heating device is first wrapped around the outside of the pipe and then buried in the wall 200, in addition to inserting the pipe into the complete cylindrical structure of the heat conductor 2, multiple separate structures 202 can also be wrapped around the outside of the pipe and connected end to end to form a complete cylindrical structure, thereby achieving complete wrapping of the pipe along its circumference.
[0072] Example 2
[0073] This embodiment provides an electric heating device with a quickly replaceable heating element. The structure of other parts of this heating device is the same as that of the electric heating device in Embodiment 1, except that, as... Figure 6 As shown, in this embodiment, the heat conductor 2 is formed by splicing two separate structures 202 to form a complete cylindrical structure.
[0074] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.
Claims
1. An electric heating device with a quickly replaceable heating element, used for heating a target containing a high-temperature heat transfer medium in a nuclear reactor, characterized in that, The electric heating device includes: Heating element; A heat conductor, which is a cylindrical structure, is used to wrap the target to be heated. The heat conductor has a channel on its side wall, which extends from one end of the heat conductor along the axial direction of the heat conductor. The heating element is detachably inserted into the channel. A heat insulation layer is disposed on the outer periphery of the heat conductor.
2. The electric heating device with a quickly replaceable heating element as described in claim 1, characterized in that, The number of the channels and the heating elements are both multiple, and the multiple heating elements and the multiple channels are arranged in a one-to-one correspondence. The multiple channels are evenly distributed along the circumference of the heat conductor.
3. The electric heating device with a quickly replaceable heating element as described in claim 1, characterized in that, The cross-sectional shape of the heating element matches the cross-sectional shape of the channel, and the size of the channel is larger than the size of the heating element.
4. The electric heating device with a quickly replaceable heating element as described in claim 3, characterized in that, The difference between the size of the heating element and the size of the channel is no greater than 0.5 cm.
5. The electric heating device with a quickly replaceable heating element as described in claim 1, characterized in that, Along the axial direction of the heat conductor, the size of the heat conductor is not less than the size of the target being heated, and the size of the channel is equal to or less than the size of the target being heated.
6. The electric heating device with a quickly replaceable heating element as described in claim 5, characterized in that, Along the axial direction of the heat conductor, the size of the heating element is not less than the size of the channel.
7. The electric heating device with a quickly replaceable heating element as described in claim 1, characterized in that, There is a gap between the inner peripheral side of the heat conductor and the outer peripheral side of the heated target.
8. The electric heating device with a quickly replaceable heating element as described in claim 7, characterized in that, The difference between the outer circumference of the heated target and the inner circumference of the heat conductor is no greater than 0.5 cm.
9. The electric heating device with a quickly replaceable heating element as described in claim 1, characterized in that, The cylindrical structure is composed of at least two separate structures, which are connected end to end to form a complete cylindrical structure.
10. The electric heating device with a quickly replaceable heating element as described in claim 9, characterized in that, The first end of each of the split structures has a protrusion extending along the axial direction of the heat conductor, and the tail end of each of the split structures has a groove that matches the protrusion, with the protrusion embedded in the adjacent groove.