Flexible folding type high-temperature precise control heating system and heating method
By using the stacked structure of flexible heating layer and flexible temperature control layer, blind-zone-free temperature monitoring and precise control of flexible heating system are achieved, solving the problems of blind zone monitoring and local overheating under deformation conditions of traditional heating structure, and improving the safety and heating uniformity of system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-01
- Publication Date
- 2026-03-27
AI Technical Summary
Traditional flexible heating structures have limitations in terms of structural deformation adaptability, heating uniformity, and temperature monitoring accuracy. In particular, when folded, covered, or bent, they are prone to local overheating and monitoring blind spots, making it difficult to achieve a high level of safety in temperature control.
It adopts a layered structure of flexible heating layer and flexible temperature control layer. The flexible temperature control layer is a thermistor material layer with positive and negative temperature coefficients, which covers the heating area to form a planar temperature monitoring network. The control unit detects and adjusts the power input of the heating layer in real time to achieve overall blind-spot-free temperature monitoring and precise control.
It enables continuous, real-time temperature detection under flexible deformation conditions, avoids local overheating, improves the safety and heating uniformity of the heating system, and extends its service life.
Smart Images
Figure CN121751415A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of temperature control of large heating area products such as heating mattress, car heating cushion, and particularly discloses a flexible folding type high temperature precise control heating system and a heating method. BACKGROUND
[0002] High temperature heating products are widely used in industrial heating, personal heating, medical physiotherapy, outdoor equipment and other fields. Traditional flexible or portable heating structures mostly use electric heating wires, metal film resistance wires and the like as heating elements, and the partial temperature points of the heating area are monitored by temperature sensors (such as NTC thermistors) to realize basic temperature regulation and overheat protection. However, with the development of heating equipment towards "flexibility, foldability, conformability to curved surface, and precise temperature control", the traditional scheme has obvious limitations in structure deformation adaptability, heating uniformity and temperature monitoring accuracy.
[0003] Firstly, the electric heating wire or metal resistance wire has a limited bending life, and the conductor is prone to breakage or fine crack propagation under working conditions such as folding, compression and repeated folding. Once the conductor structure changes, the local resistance change will cause local heat accumulation, resulting in abnormally high temperature, and even the risk of burning or fire. In addition, the traditional electric heating wire is linear heating, and when the heating path is folded or bent, "hot spot area" is easily formed, the heat distribution is uneven, and the heating efficiency and thermal safety are difficult to guarantee.
[0004] Secondly, conventional temperature monitoring methods mostly rely on a small number of point-type temperature measuring elements such as NTC thermistors or temperature probes. Such sensors can only reflect the temperature change at discrete positions, and cannot present the temperature distribution of the entire heating surface area in real time. Once the heating surface is covered, folded, compressed or unevenly cooled, temperature abnormalities may occur in the area not covered by the sensor, making it difficult to monitor and handle the partial overheating state in time, and it is difficult to meet the high safety level temperature control requirements of large area flexible materials.
[0005] Therefore, there is an urgent need for a high temperature heating structure that is flexible, foldable, has overall non-blind area temperature monitoring capability, and can perform precise closed-loop control and real-time safety protection according to the local thermal state. SUMMARY
[0006] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide a flexible, foldable, and overall non-blind area temperature monitoring capable heating system.
[0007] To achieve the above objectives, the present invention provides a flexible foldable high-temperature precision control heating system, comprising a flexible heating unit and a control unit. The flexible heating unit has a layered structure, including a flexible heating layer and a flexible temperature control layer stacked on top of the flexible heating layer. The control unit is electrically connected to both the flexible heating layer and the flexible temperature control layer. The flexible heating layer generates heat when energized and has the elasticity to bend according to its shape. The flexible temperature control layer covers the heating area of the flexible heating layer, thereby forming a surface temperature monitoring network without blind spots. The control unit detects the feedback signal from the flexible temperature control layer and identifies local temperature anomalies caused by partial folding or covering based on the feedback signal, thereby adjusting or cutting off the power input of the flexible heating layer. The present invention constructs a surface temperature monitoring network through a layered structure of a flexible heating layer and a fully covered flexible temperature control layer, thereby realizing a technical system of structural flexibility, full-area temperature sensing, and intelligent temperature control.
[0008] Furthermore, the flexible temperature control layer is a positive temperature coefficient (PTC) or negative temperature coefficient (NTC) thermistor material layer, whose resistance changes continuously with temperature. The flexible temperature control layer uses PTC or NTC characteristic materials, whose resistance changes continuously with temperature. This layer is uniformly distributed within the heating surface. When the temperature of the heating layer changes, the resistance of the temperature control layer changes synchronously, forming an electrical mapping that reflects the temperature field of the entire area. The temperature control layer can achieve continuous, real-time temperature detection under large-area, flexible deformation conditions, with high detection accuracy and fast response. The material itself can bend according to its shape and is not affected by local structural deformation. Using a material with continuous impedance change characteristics for overall monitoring of the flexible heating surface achieves "continuous temperature distribution sensing" rather than "discrete point sensing," a function that traditional NTC point-based systems cannot achieve.
[0009] Furthermore, the flexible temperature control layer is directly printed or coated onto the surface of the flexible heating layer through an insulating medium, forming an integrated "heating-temperature sensing" functional film. The integrated heating and temperature sensing structure reduces air gaps between layers, improving temperature sensing accuracy; the thinner and more flexible structure avoids temperature sensing delays caused by interlayer slippage; the manufacturing process is simplified, resulting in higher reliability. The "heating-temperature sensing integrated film" design overcomes the problem of traditional temperature sensors requiring separate installation, achieving a truly self-sensing flexible heating material.
[0010] Further, the flexible heating layer is a carbon-based composite cloth structure, the flexible heating layer comprising a carbon-based conductive paste and a base cloth layer, the carbon-based conductive paste penetrating into the fiber gaps of the base cloth layer to form a conductive composite structure; the base cloth layer acts as a skeleton support to limit the crack propagation of the carbon-based conductive paste during repeated folding, so that the flexible heating layer maintains the integrity of the conductive path when subjected to folding deformation. The overall folding resistance, fatigue resistance and tear resistance are improved to avoid the breakage or local resistance mutation of the metal wire heating body due to folding. The overall heating is flat and uniform, and the thermal stability is strong. The fiber cloth is used as a "crack suppression skeleton of conductive paste" to form a "textile reinforced carbon-based heating structure", which improves the bending life by orders of magnitude compared with traditional graphene films or metal wires.
[0011] Further, the carbon-based conductive paste is one of modified graphene conductive ink, multi-walled carbon nanotube paste or carbon fiber blended layer, and the base cloth layer is one of high-temperature-resistant nylon cloth, polyester fiber cloth or glass fiber cloth. The materials can be flexibly selected according to the temperature application scene; they can work stably in a large temperature range environment without losing flexibility; the carbon material has the characteristics of self-limiting temperature or stable resistance, which improves the heating uniformity.
[0012] Further, the flexible heating unit further comprises an electrode assembly arranged along the edge of the flexible heating layer, the electrode assembly being in a wave-shaped or S-shaped wiring structure for matching the tensile deformation of the flexible heating layer. The violent folding is avoided to cause the electrode to break, the structural life of the electrode connection part is improved, and the power connection stability is maintained to help the overall heating to be uniform.
[0013] Further, the carbon-based conductive paste is provided in multiple groups, the multiple groups of carbon-based conductive paste dividing the flexible heating layer into multiple independent heating areas, and a temperature sensing module corresponding to each heating area being arranged on the flexible temperature control layer; a control unit receiving signals of the temperature sensing module to adjust the power of each heating area in a partitioned manner to realize local temperature setting and precise control. Differentiated temperature control can be realized: the needs of some areas requiring high temperature and some areas requiring constant temperature can be met at the same time. The temperature field uniformity is improved to avoid local overheating.
[0014] Further, the carbon material density of the carbon-based conductive paste is gradiently distributed along the thickness direction, the gradient distribution being used to compensate for the uneven heat dissipation of the flexible heating layer in actual application to ensure that the temperature field distribution sensed by the flexible temperature control layer is more uniform under constant power input. The temperature field uniformity is significantly improved, especially for the problems of fast edge heat dissipation and uneven local heat dissipation; and a smoother temperature curve can be maintained under constant power input.
[0015] The flexible folding high-temperature precise control heating method comprises the flexible folding high-temperature precise control heating system and further comprises the following steps: S1, the control unit applies a driving voltage to the flexible heating layer to start heating; S2, the flexible temperature control layer covering the flexible heating layer senses the temperature field state of the heating area of the flexible heating layer in real time and converts the temperature field state into an electrical impedance signal; S3, the control unit distinguishes between "overall temperature rise" and "local overheating" according to the change characteristics of the electrical impedance signal; when it is determined that it is normal overall temperature rise, the driving voltage is adjusted to maintain constant temperature; when it is determined that it is local overheating, the power supply to the flexible heating layer is immediately stopped.
[0016] Further, the step S3 of "distinguishing between overall temperature rise and local overheating" specifically comprises: setting a maximum allowed temperature rise rate threshold in a normal heating process; calculating the equivalent temperature rise rate corresponding to the flexible temperature control layer feedback signal in real time; if the calculated equivalent temperature rise rate continuously exceeds the maximum allowed temperature rise rate threshold within a set time, it is determined that the heat cannot be dissipated due to folding or covering, and it is confirmed as a local overheating state.
[0017] The present application has the following advantages: the flexible heating layer and the flexible temperature control layer of the present application adopt a laminated integrated structure, the temperature control layer covers the entire heating area and forms a distributed temperature detection network. Compared with the traditional point type temperature sensing method, the temperature distribution state of the entire heating area can be sensed in real time, and the surface temperature monitoring capability of "no dead angle and no blind area" is realized, It is particularly suitable for complex working conditions such as curved surface, folding and covering; The resistance or impedance change of the temperature control layer directly feeds back the local temperature rise information to the control unit, the control unit can identify "overall normal temperature rise" and "local abnormal overheating" according to the change mode, and make dynamic power adjustment or power-off protection processing, thereby significantly improving the safety of the heating system; The flexible heating layer is formed by compounding a carbon-based conductive paste and a fiber cloth substrate, and the crack propagation is limited by the fiber structure, so that the conductive path remains continuous under repeated folding, and compared with the traditional metal wire, it has higher bending life and stability. BRIEF DESCRIPTION OF DRAWINGS
[0018] Fig. 1 It is a structural schematic view of a flexible folding high-temperature precise control heating system of the present application; Fig. 2 It is a sectional view of a flexible heating unit of the present application; Fig. 3 It is an exploded view of the second embodiment of the flexible heating unit of the present application.
[0019] The reference signs comprise: 1, flexible heating unit; 2, control unit; 3, flexible heating layer; 4, flexible temperature control layer; 5, insulating medium; 6, electrode assembly; 7, encapsulation protection layer; 8, heat directional layer. DETAILED DESCRIPTION
[0020] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object of the application, the specific embodiments, structures, features and effects according to the present application will be described in detail below in combination with the drawings and preferred embodiments.
[0021] Referring to Figs. 1 to 3 As shown in the drawings, the flexible folding high-temperature precise control heating system of the present application comprises a flexible heating unit 1 and a control unit 2; the flexible heating unit 1 is a laminated structure, comprising a flexible heating layer 3 and a flexible temperature control layer 4 which is laminated with the flexible heating layer 3, and the control unit 2 is electrically connected with the flexible heating layer 3 and the flexible temperature control layer 4 respectively; the flexible heating layer 3 is used to generate heat in the energized state and has elastic shape bending; the flexible temperature control layer 4 covers the heating area of the flexible heating layer 3, thereby forming a planar temperature monitoring network without blind area; the control unit 2 detects the feedback signal of the flexible temperature control layer 4 and identifies the local temperature anomaly caused by local folding or covering according to the feedback signal, and then adjusts or cuts off the power input of the flexible heating layer 3. The present application constructs a planar temperature monitoring network through the laminated structure of the flexible heating layer 3 + the overall covering flexible temperature control layer 4, thereby realizing the technical system of structure flexibility + temperature sensing globality + intelligent temperature control.
[0022] Specifically, after the system is powered on, the flexible heating layer 3 generates heat, and thanks to its flexible structure, the flexible heating unit 1 can withstand any bending, curling or folding operation, at the same time, the flexible temperature control layer 4 can real-time perceive the temperature distribution on the entire heating plane. Since it adopts a planar continuous temperature sensing structure, the electrical feedback signal (such as overall impedance, voltage, etc.) output by it can represent the comprehensive thermal state of the entire heating area, and the core function of the control unit 2 is to identify local temperature anomalies. The control unit 2 continuously collects the feedback signal of the flexible temperature control layer 4, when the flexible composite heating body is locally folded or covered, the heat of the local area cannot be dissipated, and the temperature will rise rapidly. Since the flexible temperature control layer 4 covers the entire hot spot area, the impedance (or voltage) of the heated area will have a sharp, unexpected abnormal mutation, and the logic program built-in the control unit 2 will capture this signal abnormal mutation caused by local heat accumulation, and immediately determine it as a local overheating state, and execute the action of reducing or cutting off the power input of the flexible heating layer 3. The innovation of this embodiment lies in the integration of the flexible heating structure with shape bending elasticity and the overall covering planar continuous temperature sensing structure. This structure ensures that the system meets the mechanical requirements of any folding while solving the monitoring blind area problem of traditional point-like sensors in flexible body applications, thereby realizing high-reliability precise control and active safety protection.
[0023] The flexible temperature control layer 4 is a layer of positive temperature coefficient thermosensitive material or a layer of negative temperature coefficient thermosensitive material, and the resistance of the thermosensitive material layer continuously changes with temperature. The flexible temperature control layer 4 is made of PTC or NTC material, and the resistance continuously changes with temperature. The layer is uniformly distributed in the heating surface, and when the temperature of the heating layer changes, the resistance of the temperature control layer changes synchronously, forming an electrical mapping that can reflect the temperature field of the entire area. The temperature control layer can realize continuous and real-time temperature detection under the condition of large area and flexible deformation, with high detection accuracy, fast response, and the material itself can be bent with the shape, and is not affected by local structural deformation. The material with continuous impedance change characteristics is used for overall monitoring of the flexible heating surface to realize "continuous temperature distribution sensing" rather than "discrete point sensing", which is a function that traditional NTC point type cannot achieve.
[0024] Preferably, the flexible temperature control layer 4 is made of a layer of negative temperature coefficient (NTC) thermosensitive material (for example, a thermosensitive polymer thick film ink). The material layer has a unique characteristic that its resistance continuously and stably decreases with the increase of temperature. The flexible temperature control layer 4 is designed to completely cover the heating area of the flexible heating layer 3, forming a planar temperature monitoring network without blind area. By using the characteristics of NTC material, a continuous and stable quantitative relationship between temperature change and electrical signal change is ensured, providing high-precision thermal state input for the control unit 2. Since the resistance of the material itself changes clearly, the temperature calibration and abnormal identification logic of the control unit 2 can be programmed based on the known material characteristics, simplifying the design and reliability verification of the control system.
[0025] The flexible temperature control layer 4 is directly printed or coated on the surface of the flexible heating layer 3 through the insulating medium 5, forming a "heating-temperature sensing" integrated functional film. The integration of heating and temperature sensing structure reduces the air gap between the layers, improves the accuracy of temperature sensing, and makes the structure thinner and more flexible, which can avoid the temperature sensing delay caused by layer sliding. The production process is simplified, and the reliability is higher. The use of "heating-temperature sensing integrated film" design breaks through the problem of independent installation of traditional temperature sensors, and realizes the truly self-sensing flexible heating material.
[0026] Preferably, the insulating medium 5 is made of ultra-thin, high-temperature-resistant and good thermal conductivity insulating material (for example, polyimide or PET film with a thickness of 25 μm), which is used to isolate the flexible heating layer 3 and the flexible temperature sensing layer.
[0027] The flexible heating layer 3 is a carbon-based composite cloth structure, which comprises a carbon-based conductive paste and a base cloth layer. The carbon-based conductive paste penetrates into the fiber gap of the base cloth layer to form a conductive composite structure. The base cloth layer acts as a framework support to limit the crack propagation of the carbon-based conductive paste during repeated folding, so that the flexible heating layer 3 maintains the integrity of the conductive path when subjected to folding deformation. The overall folding resistance, fatigue resistance and tear resistance are improved, and the metal wire heating body is prevented from being broken or locally broken due to folding. The overall heating is flat and uniform, and the thermal stability is strong. The fiber cloth is used as a "conductive paste crack suppression framework" to form a "textile reinforced carbon-based heating structure", which improves the bending life by orders of magnitude compared with traditional graphene film or metal wire.
[0028] The carbon-based conductive paste is one of modified graphene wire ink, multi-walled carbon nanotube paste or carbon fiber blended layer, and the base cloth layer is one of high-temperature-resistant nylon cloth, polyester fiber cloth or glass fiber cloth. The material can be flexibly selected according to the temperature application scene; it can work stably in a wide temperature range without losing flexibility; the carbon material has self-limiting temperature or resistance stability characteristics, which improves the heating uniformity.
[0029] Preferably, the base cloth layer uses high-temperature-resistant nylon cloth with a thickness of about 0.4 mm as the framework of the composite structure, and the carbon-based conductive paste preferably uses low-viscosity modified graphene wire ink.
[0030] Specifically, the high-temperature-resistant cloth is placed on a coating platform, and a scraping or dipping process is used to make the modified graphene wire ink penetrate into the fiber gap of the cloth layer, rather than just stay on the surface. After low-temperature drying and high-temperature curing, the graphene paste is tightly combined with the fiber to form a fiber-reinforced conductive composite structure. In this structure, the cloth layer acts as a framework, which can effectively limit the crack propagation of the carbon-based conductive network at the bending place when the system is subjected to any folding, rubbing and other deformations, thereby ensuring the long-term integrity of the conductive path from the micro level.
[0031] Specifically, after the printing and curing of the flexible heating layer 3 are completed, the insulating medium 5 is tightly attached to the surface of the flexible heating layer 3 by lamination or coating, and the NTC thermosensitive material ink is directly printed or coated on the surface of the insulating medium 5 by using a flexible printing process such as screen printing or inkjet printing. The printing range accurately covers the heating area, forming a planar temperature monitoring network without blind area. The flexible temperature control layer 4 after printing is subjected to low-temperature curing, and finally a "heating-temperature sensing" integrated functional film with high structural integration is formed. Since the flexible temperature control layer 4 is directly and tightly integrated on the insulating medium 5 by printing or coating, the distance between the layers is extremely small, significantly reducing the thermal resistance. When the temperature of the heating layer changes, the temperature control layer can instantly perceive and feedback signals, improving the real-time performance and sensitivity of abnormal mutation identification. The integrated functional film has high structural integration, reducing the number of interfaces and layers, and effectively enhancing the anti-delamination capability and mechanical durability of the flexible heating unit 1 under any folding and stretching.
[0032] The flexible heating unit 1 further comprises an electrode assembly 6 arranged along the edge of the flexible heating layer 3. The electrode assembly 6 has a wave-shaped or S-shaped wiring structure for matching the stretching deformation of the flexible heating layer 3. This avoids the breakage of the electrode caused by violent folding, improves the structural life of the electrode connection part, maintains the stability of the power connection, and helps to achieve uniform heating.
[0033] In the second embodiment, the carbon-based conductive paste is provided in multiple groups, which divide the flexible heating layer 3 into multiple independent heating areas. The flexible temperature control layer 4 is provided with temperature sensing modules corresponding to each heating area. The control unit 2 receives the signals of the temperature sensing modules and independently adjusts the power of each heating area, achieving local temperature setting and precise control. This can realize differentiated temperature control, meeting the needs of high temperature in some areas and constant temperature in other areas, improving the uniformity of the temperature field, and avoiding local overheating.
[0034] Preferably, the flexible heating layer 3 is divided into three independent heating areas A1, A2, and A3 by arranging multiple groups of carbon-based conductive paste on the flexible heating layer 3. The flexible temperature control layer 4 is provided with three corresponding temperature sensing modules B1, B2, and B3. The control unit 2 receives the feedback signals of each temperature sensing module, achieving the following functions: zoned temperature closed-loop control, if the temperature in area A1 is too low, the driving voltage in this area is independently increased, if there is local overheating in area A3, only the power supply in this area is turned off without affecting other areas; adaptive uniform temperature compensation, when it is detected that the edge area has faster heat dissipation, the power of the edge area is automatically adjusted to compensate for the uneven heat field. This structure is particularly suitable for scenarios such as flexible heating strips, clothing heating systems, and folding equipment heat control systems that require uniform heat field or local high-temperature baking.
[0035] The carbon-based conductive paste carbon material density is gradiently distributed along the thickness direction, and the gradient distribution is used to compensate for uneven heat dissipation of the flexible heating layer 3 in actual application, so as to ensure that the temperature field distribution sensed by the flexible temperature control layer 4 is more uniform under constant power input. The temperature field uniformity is significantly improved, especially for the problems of fast edge heat dissipation and uneven local heat dissipation; and a smoother temperature curve can be maintained under constant power input.
[0036] Specifically, the flexible heating unit 1 is provided with a stress release structure, which includes a non-conductive elastic cut, a hollow or a flexible buffer material belt arranged in the folding direction; the stress release structure is used to absorb, disperse and guide the mechanical strain generated by the flexible heating layer 3 at the bending position when the flexible heating unit 1 is folded, further ensuring the integrity of the flexible heating layer 3 and the flexible temperature control layer 4 under long-term folding.
[0037] Specifically, the local overheating protection logic executed by the control unit 2 is that: the flexible temperature control layer 4 is equivalent to a network composed of countless micro-resistors in parallel or series; when the flexible heating layer 3 is locally folded to cause local temperature to rise sharply, the micro-resistor resistance of the heated area changes suddenly, causing nonlinear change of the total impedance value between the two ends of the flexible temperature control layer 4; the control unit 2 captures the change slope (dZ / dt) of the total impedance value, and when the change slope exceeds the preset safety threshold, it is determined that local overheating occurs and power-off protection is executed.
[0038] Specifically, the outermost layer of the flexible heating unit 1 is the packaging protection layer 7; the packaging protection layer 7 is made of flexible high polymer materials (such as silicone, fluorocarbon coating or polyimide film) with wear resistance, waterproofness and flame retardant properties; the packaging protection layer 7 is used to provide mechanical and environmental isolation for the internal flexible heating layer 3 and the flexible temperature control layer 4, and to improve the ultimate safety level of the system.
[0039] Specifically, the flexible heating unit 1 further includes a heat directional layer 8; the heat directional layer 8 is arranged on the side of the flexible temperature control layer 4 away from the flexible heating layer 3, and the heat directional layer 8 is composed of infrared reflective materials (such as metal film or metalized polymer) with low emissivity; the heat directional layer 8 is used to effectively reflect heat back to the target heating side, reduce heat loss in the non-working direction, and improve the heating efficiency and energy utilization rate of the system.
[0040] The flexible folding high-temperature precision control heating method comprises the flexible folding high-temperature precision control heating system, and further comprises the following steps: S1, the control unit 2 applies a driving voltage to the flexible heating layer 3 to start heating; S2, the flexible temperature control layer covering the flexible heating layer 3 senses the temperature field state of the heating area of the flexible heating layer 3 in real time and converts the temperature field state into an electrical impedance signal; S3, the control unit 2 distinguishes between “overall temperature rise” and “local overheating” according to the change characteristics of the electrical impedance signal; when it is determined that the overall temperature rise is normal, the driving voltage is adjusted to maintain constant temperature; when it is determined that the local overheating, the power supply to the flexible heating layer 3 is immediately stopped.
[0041] The step S3 of “distinguishing between overall temperature rise and local overheating” specifically comprises: setting a maximum allowed temperature rise rate threshold in a normal heating process; calculating the equivalent temperature rise rate corresponding to the feedback signal of the flexible temperature control layer 4 in real time; if the calculated equivalent temperature rise rate continuously exceeds the maximum allowed temperature rise rate threshold within a set time, it is determined that the heat cannot be dissipated due to folding or covering, and the local overheating state is confirmed.
[0042] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, as long as it does not deviate from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.
Claims
1. A flexible, foldable, high-temperature precision control heating system, comprising a flexible heating unit (1) and a control unit (2); characterized in that: The flexible heating unit (1) is a stacked structure, including a flexible heating layer (3) and a flexible temperature control layer (4) stacked with the flexible heating layer (3). The control unit (2) is electrically connected to the flexible heating layer (3) and the flexible temperature control layer (4) respectively. The flexible heating layer (3) is used to generate heat when energized and has the elasticity to bend according to the shape. The flexible temperature control layer (4) covers the heating area of the flexible heating layer (3), thereby forming a surface temperature monitoring network without blind spots. The control unit (2) detects the feedback signal of the flexible temperature control layer (4) and identifies the local temperature abnormality caused by local folding or covering according to the feedback signal, and then adjusts or cuts off the power input of the flexible heating layer (3).
2. The flexible folding high-temperature precision control heating system according to claim 1, characterized in that: The flexible temperature control layer (4) is a positive temperature coefficient thermistor material layer or a negative temperature coefficient thermistor material layer, and the resistance value of the thermistor material layer changes continuously with temperature.
3. The flexible folding high-temperature precision control heating system according to claim 1, characterized in that: The flexible temperature control layer (4) is directly printed or coated on the surface of the flexible heating layer (3) through the insulating medium (5) to form an integrated "heating-temperature sensing" functional film.
4. The flexible folding high-temperature precision control heating system according to claim 1, characterized in that: The flexible heating layer (3) is a carbon-based composite fabric structure. The flexible heating layer (3) includes a carbon-based conductive paste and a base fabric layer. The carbon-based conductive paste penetrates into the fiber gaps of the base fabric layer to form a conductive composite structure. The base fabric layer serves as a skeleton support, limiting the crack propagation of the carbon-based conductive paste during repeated folding, so that the flexible heating layer (3) maintains the integrity of the conductive path when subjected to folding deformation.
5. The flexible folding high-temperature precision control heating system according to claim 4, characterized in that: The carbon-based conductive paste is one of the following: modified graphene wire ink, multi-walled carbon nanotube paste, or carbon fiber blended layer; the base fabric layer is one of the following: high-temperature resistant nylon fabric, polyester fiber fabric, or glass fiber fabric.
6. The flexible folding high-temperature precision control heating system according to claim 1, characterized in that: The flexible heating unit (1) also includes an electrode assembly (6), which is arranged along the edge of the flexible heating layer (3). The electrode assembly (6) has a wavy or S-shaped wiring structure to match the tensile deformation of the flexible heating layer (3).
7. The flexible folding high-temperature precision control heating system according to claim 4, characterized in that: The carbon-based conductive paste is provided in multiple groups, which divide the flexible heating layer (3) into multiple independent heating areas. The flexible temperature control layer (4) is provided with temperature sensing modules corresponding to each heating area. The control unit (2) receives the signal from the temperature sensing module and performs independent power adjustment for each heating area to achieve local temperature setting and precise control.
8. The flexible folding high-temperature precision control heating system according to claim 4, characterized in that: The carbon-based conductive paste has a gradient density along the thickness direction. This gradient distribution is used to compensate for the uneven heat dissipation of the flexible heating layer (3) in practical applications, ensuring that the temperature field sensed by the flexible temperature control layer (4) is more uniform under constant power input.
9. A flexible, foldable, high-temperature precision control heating method, characterized in that, The flexible folding high-temperature precision control heating system according to any one of claims 1-8 further includes the following steps: S1, the control unit (2) applies a driving voltage to the flexible heating layer (3) to start heating; S2, the flexible temperature control layer covering the flexible heating layer (3) senses the temperature field state of the heating area of the flexible heating layer (3) in real time and converts the temperature field state into an electrical impedance signal; S3, the control unit (2) distinguishes between "overall heating" and "local overheating" according to the change characteristics of the electrical impedance signal; when it is determined to be normal overall heating, the driving voltage is adjusted to maintain constant temperature; when it is determined to be local overheating, the power supply to the flexible heating layer (3) is immediately stopped.
10. The flexible folding high-temperature precision control heating system according to claim 9, characterized in that, The step S3, "distinguishing between overall heating and local overheating", specifically includes: setting the maximum allowable heating rate threshold during normal heating; calculating the equivalent temperature rise rate corresponding to the feedback signal of the flexible temperature control layer (4) in real time; if the calculated equivalent temperature rise rate continuously exceeds the maximum allowable heating rate threshold within a set time, it is determined that the heat caused by folding or covering cannot be dissipated, and it is confirmed as a local overheating state.