Thermal insulation performance detection device for constructional engineering wall

Abstract

The invention discloses a building engineering wall thermal insulation performance detection device, which relates to the technical field of building energy-saving detection and nondestructive testing, and is provided with an annular support frame, an annular mixed material layer (magneto-rheological-lockhole gel), inner and outer double-ring electromagnetic coils, an electrical interface electrode and a conventional temperature sensor, and a controller with state regulation, temperature measurement and data processing functions is matched. The device inverts an interface temperature field and calculates heat conduction and heat transfer parameters through fitting spreading, outer edge rigid sealing, distributed electrical / magnetic acquisition and reference temperature calibration. A recovery channel and a negative pressure source are arranged, material dispergation recovery and interface self-cleaning are achieved, the device is suitable for multi-point continuous detection, and precision and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of building energy conservation testing and non-destructive testing technology, specifically a device for testing the thermal insulation performance of building walls. Background Technology

[0002] The thermal conductivity, heat transfer coefficient, and interfacial thermal resistance of a building envelope are key indicators for evaluating its insulation performance and energy-saving compliance. Current engineering testing primarily employs portable heat flow meter methods, heat shield plate methods, and on-site assessments using infrared thermography. The heat flow meter method is highly sensitive to interfacial contact conditions; rough walls, dust content, and fluctuations in moisture content can lead to unstable contact thermal resistance and reduced repeatability. The heat shield plate method is mostly conducted in laboratories, with large equipment and long setup times, making it unsuitable for rapid on-site sampling. Infrared thermography is significantly affected by ambient wind speed, solar radiation, and surface emissivity, making it difficult to directly obtain quantitative heat transfer parameters, requiring complex corrections, and having limited quantitative resolution for localized weak areas.

[0003] Existing portable testing devices mostly rely on elastic gaskets or adhesive layers to establish contact and seal. When facing complex surfaces such as external wall insulation finishes, rough mortar surfaces, and coating joints, the adhesion stability is poor. Once the sealing tape accumulates dust or adsorbs particles, the thermal contact and airtightness further deteriorate, requiring frequent replacement of consumables and resulting in low on-site efficiency. Single-point measurement is the main method, and it is difficult to capture the non-uniformity of the temperature field in the circumferential and small areas, leading to deviations in parameter estimation. There is a lack of unified timing management between the temperature link and the device excitation, and electromagnetic interference and parasitic coupling have a significant impact on the acquisition of weak signals. There is a lack of controllable material recycling and self-cleaning paths, and after long-term use, interface contamination accumulates, data drift intensifies, and maintenance costs increase.

[0004] Therefore, there is an urgent need for a wall insulation performance testing device for engineering sites that can adaptively establish stable adhesion and annular seal under rough, dusty, and multi-type finish conditions. It should utilize circumferential distributed electrical / magnetic observations and reference temperature anchors to achieve robust inversion of temperature field and heat transfer parameters. After testing, it should achieve material circulation and interface self-cleaning through degumming and negative pressure recovery. At the same time, it should support multi-position continuous scanning and consistent timing control to improve testing accuracy, repeatability, and work efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a device for testing the thermal insulation performance of building walls in order to solve the above-mentioned problems.

[0006] The objective of this invention is achieved through the following technical solution: a device for testing the thermal insulation performance of building walls, comprising: A ring-shaped support frame, one side of which is the side that fits against the wall to be measured; An annular layer of mixed material is disposed on the outer edge of the fitting side, and the mixed material layer is continuously disposed along the circumference of the annular support frame; A partition is fixedly connected to the end of the ring support frame away from the mixed material layer. A filter layer is fixedly connected to the end of the partition away from the ring support frame. A return plate is fixedly connected to the end of the filter layer away from the partition. A shell is fixedly connected to the end of the return plate away from the filter layer. The shell is a hollow structure and has a support interface. A first electromagnetic coil is provided on the inner edge of the ring support frame, and a second electromagnetic coil is provided on the outer edge. The first and second electromagnetic coils can be energized independently to generate a spatially controllable magnetic field within the hybrid material layer. Several electrical interface electrodes are provided between the first electromagnetic coil and the second electromagnetic coil. The electrical interface electrodes are set on the annular support frame and are in electrical contact with the hybrid material layer. A conventional temperature sensor assembly is mounted on the ring-shaped support frame; It also includes a controller, which is electrically connected to the first electromagnetic coil, the second electromagnetic coil, the electrical interface electrode, and the conventional temperature sensor assembly. The controller includes: a state control module, which controls the on / off state, current magnitude, and waveform of the first and second electromagnetic coils, and controls the electrical interface electrodes to apply electrical signals; a temperature measurement module, which collects electrical response data of the hybrid material layer and / or magnetic response data of the first and second electromagnetic coils, and combines it with reference temperature data from a conventional temperature sensor assembly; and a data processing module, which, based on the measurement data acquired by the temperature measurement module and combined with a pre-calibrated hybrid material temperature response model, inverts the temperature distribution in the wall bonding area and calculates the wall insulation performance parameters. The hybrid material layer is composed of the following components by mass percentage: 40%–80% reversible gel matrix component, 10%–40% magnetically responsive particle component, 5%–20% conductive and / or ionicly conductive component, and 1%–10% reversible crosslinking control component.

[0007] The reversible gel matrix component is a hydrogel matrix and / or an organic gel matrix; the hydrogel matrix is ​​selected from any one or combination of polyvinyl alcohol gel, polyacrylamide gel, and acrylic copolymer gel; the organic gel matrix is ​​selected from any one or combination of polyurethane gel and silicone rubber gel; the magnetically responsive particle component is any one or combination of ferrite particles, carbon-based magnetic particles, or metallic magnetic microparticles, and is surface modified to improve its dispersion stability in the reversible gel matrix component; the conductive and / or ionicly conductive component is any one or combination of conductive polymer, carbon nanomaterials, or dissociable salt electrolyte.

[0008] The first and second electromagnetic coils are driven independently by the state control module to form a magnetic field gradient distribution in the radial direction of the hybrid material layer. This makes the hybrid material area near the outer edge of the annular support frame in a rigid state during the sealing stage, while the hybrid material area near the wall side remains fluid during the adsorption stage. During the recycling stage, the magnetic field distribution is switched to soften the area near the wall side and maintain rigidity the area near the annular support frame side.

[0009] The electrical interface electrodes are arranged in multiple electrode units at intervals along the circumferential direction of the annular support frame. Each electrode unit includes an electrode pair for impedance measurement. The temperature measurement module is used to obtain resistance and / or impedance spectrum data of the hybrid material layer at multiple locations in the circumferential direction. The data processing module is used to reconstruct the temperature distribution along the circumferential direction of the wall bonding area based on the circumferentially distributed electrical response data.

[0010] The temperature measurement module is used to obtain data on the changes in magnetic loss, induced voltage, and / or permeability of the hybrid material layer over time based on the relationship between the excitation current and magnetic response of the first and second electromagnetic coils during the detection phase. The data processing module is used to input the magnetic response data, electrical response data, and measurement data from conventional temperature sensor components into the hybrid material temperature response model to obtain an estimated value of the interface temperature.

[0011] The conventional temperature sensor assembly includes multiple temperature sensors distributed at different circumferential positions on the annular support frame. Each temperature sensor is located near the back of the hybrid material layer. The data processing module is used to correct the temperature field obtained by inversion from the electrical and / or magnetic response of the hybrid material layer based on the measurement values ​​of each temperature sensor.

[0012] A recycling channel connected to an external negative pressure source is provided on the outer area of ​​the mixed material layer along the ring support frame. During the mixed material recycling stage, the state control module controls the recycling channel to connect with the external negative pressure source, so that the mixed material in the flow state is sucked into the recycling chamber along the recycling channel after degumming.

[0013] The controller is configured to execute the following control flow: S1: The ring-shaped mixed material layer is attached to the wall surface under power-off or low magnetic field conditions, so that the mixed material layer is in a soft flow state and spreads on the wall surface; S2: Increase the current of the second electromagnetic coil to form an annular sealing strip in the mixed material area near the outer edge of the annular support frame, and apply a first electrical signal to the mixed material area near the wall through the electrical interface electrode to make the mixed material penetrate and gel in the micropores and rough gaps on the wall surface. S3: Apply an electromagnetic field and / or an alternating current signal for detection, collect electrical response data and / or magnetic response data of the hybrid material layer, and combine it with the reference temperature data of the conventional temperature sensor assembly. The data processing module then inverts the temperature field of the wall-fitting area and calculates the wall insulation performance parameters. S4: Change the magnetic field distribution of the first and second electromagnetic coils and / or apply a degelation electrical signal through the electrical interface electrode to restore the mixed material layer from a gel state to a flow state, and cause the mixed material to detach from the wall surface and be collected.

[0014] The controller includes a motion control module, which is electrically connected to a motion drive mechanism and / or positioning component disposed on the annular support frame. After completing the thermal insulation performance test at one test position, the module controls the annular support frame to move along the wall surface to the next test position and repeats S1 to S4 of claim 8 at different test positions.

[0015] The implementation method of the control process includes the following steps: A1: Place the bonding side of the ring support frame close to the wall surface so that the ring-shaped mixed material layer is in a soft flow state under power-off or low magnetic field conditions and completes bonding and spreading. A2: Increase the current of the second electromagnetic coil and apply the first electrical signal through the electrical interface electrode to form an annular sealing strip in the outer edge area of ​​the annular mixed material layer, and allow the mixed material in the inner edge area to penetrate into the micropores of the wall surface and gel. A3: An electromagnetic field for detection is applied and electrical response data of the annular hybrid material layer is collected through the electrical interface electrode. At the same time, temperature measurement data of the conventional temperature sensor assembly is collected. The data processing module inverts the temperature field of the wall-fitting area and calculates the wall insulation performance parameters. A4: After the test is completed, the magnetic field distribution of the first electromagnetic coil and the second electromagnetic coil is changed and / or a degelation electrical signal is applied through the electrical interface electrode to restore the annular mixed material layer from the gel state to the flow state, and the mixed material is detached from the wall surface and collected under negative pressure recovery or gravity.

[0016] The beneficial effects of this invention are: This invention utilizes a ring-shaped support frame and a ring-shaped hybrid material layer to form a continuous and closed bonding interface. The bonding area is continuous circumferentially without any discontinuous edges or corners, reducing heat leakage channels and uneven contact thermal resistance at the interface, increasing the actual contact area with rough walls, shortening the steady-state settling time of the temperature field, and improving measurement repeatability. The ring structure maintains geometric symmetry in any orientation, and the impact of assembly and positioning errors on the measurement is averaged out, making it suitable for raster scanning of large-area walls.

[0017] The annular hybrid material layer employs an integrated formulation of magnetorheology and keyhole gel, switching between a soft state and a gel state under the influence of an applied field and electrical signal. In the initial bonding stage, it spreads and fills micro-pits in a soft state; in the steady-state stage, it forms keyholes and anchors within micropores and rough gaps in a gel state; and in the degumming stage, it restores flow for recycling. This material approach provides a continuous and controllable interfacial mechanical and thermal contact state across the three stages of contact formation, sealing, and detachment for recycling. This significantly reduces contact uncertainty caused by differences in wall materials and fluctuations in moisture content, avoiding air leakage and incomplete contact that occur with traditional elastic gaskets on rough surfaces.

[0018] The first and second electromagnetic coils are driven independently, creating a programmable magnetic field gradient radially within the hybrid material layer. During the sealing phase, a rigid ring is formed in the outer region to suppress boundary leakage and stabilize isothermal boundary conditions. In the adsorption and measurement phases, the inner region maintains appropriate rheological sensitivity to ensure high-quality thermal contact. The phase and amplitude of the two coils are stable and reproducible under the closed-loop control of the state control module, reducing interface state drift caused by environmental vibrations and attitude changes, thus improving measurement stability from the source.

[0019] The electrical interface electrodes are arranged in segments along the circumference of the annular support frame. The temperature measurement module acquires multi-frequency impedance spectra of each segment to obtain complex impedance characteristics related to the material's microstructure and interface temperature. This segmented circumferential observation extends single-point temperature measurement to circumferential distributed temperature measurement. The data processing module combines the coil-side magnetic response to construct a multi-physics fusion interface temperature estimate, which can still obtain continuous temperature field reconstruction results even in the presence of local roughness abrupt changes and coating thickness differences, reducing the impact of single-point anomalies on the overall evaluation.

[0020] Conventional temperature sensor components are arranged at multiple points on the back side near the hybrid material layer, providing reference temperature anchors for the same period before and after, used for zero-bias and slope correction of electrical and magnetic estimation results. This correction path maintains a consistent data link under different wall materials and environmental temperature and humidity conditions, reducing the impact of material aging and moisture content changes on model stability and ensuring comparability of data between long-term, multi-batch tests.

[0021] The circuit formed by the baffle, filter layer, and return plate, together with the storage and recovery chambers of the housing, creates a closed-loop material circulation system. During the debinding stage, the mixed material enters the filter layer through the recovery channel under negative pressure, where powder and debris are trapped, and the clean material returns to the storage chamber to await the next use. This closed-loop system reduces the consumption of disposable consumables, maintains interface cleanliness, avoids an increase in apparent contact thermal resistance due to contamination accumulation, and significantly reduces maintenance frequency and on-site downtime.

[0022] The recovery channel and external negative pressure source employ a staged negative pressure curve and valve interlock, ensuring a smooth migration of material from the bonding interface to the recovery path, avoiding secondary disturbances and contamination at the interface. The slow-rise negative pressure section, in conjunction with the outer edge stiffening ring, generates a flanging and scraping effect, guiding residual powder particles into the recovery path instead of leaving them on the bonding surface. This creates conditions for rapid and stable bonding at the next measurement point, improving the efficiency and data consistency of continuous scanning.

[0023] The timing coordination between the motion control module and the state regulation module ensures that the bonding, sealing, detection, and retrieval of each measuring point proceed at a fixed rhythm. The data processing module registers the data for each cycle using pose and timing tags, ultimately generating a spatial map of the thermal insulation performance parameters and weak area indicators within the wall surface area. This motion-sensing integrated process improves coverage efficiency and reduces repeated bonding and waiting time while ensuring sufficient steady-state conditions at each point, making it suitable for high-density mapping during construction acceptance and energy efficiency assessments of existing buildings.

[0024] The data processing module uses a hybrid material temperature response model as its core, weightedly fusing circumferential complex impedance characteristics, coil magnetic response, and reference temperature anchor points to output a two-dimensional interface temperature field and calculate thermal conductivity and heat transfer parameters accordingly. This multi-source fusion significantly improves robustness to contact thermal resistance fluctuations, avoids systematic biases caused by drift in a single sensing link, and ensures consistent output results in repeated measurements and cross-batch comparisons, facilitating integration with regulatory limits and energy efficiency assessment models.

[0025] The ring-shaped support frame adopts an integrated slotted structure, with the coil housing and wiring slots arranged in separate sections, supplemented by a shielding layer and a single-point grounding strategy to suppress parasitic coupling and crosstalk between the coil and the electrodes. This structural design ensures that the measurement link has a sufficient signal-to-noise ratio under conditions where strong and weak signals coexist, reduces reliance on external shielding facilities and complex wiring, and makes the device readily available for field use.

[0026] The circumferential uniformity of the annular geometry and the annular material layer ensures that the device maintains the same boundary conditions when advancing in any direction. Consistent data quality is achieved even when the device is obliquely fitted on complex walls, fitted near corners, or fitted at different heights. This isotropic characteristic reduces the impact of differences in operator clamping skills on the results, shortens the training cycle, and improves data consistency between different work groups.

[0027] The control process is structured around phased steps S1 to S4 and methodological steps A1 to A4. All hardware states and data acquisition windows are strictly aligned to ensure that the interface mechanical state, magnetic field state, and electrical excitation are in a constant or predictable state within the measurement window, preventing unsteady-state segments from entering the calculation. This timing discipline is crucial for achieving steady-state temperature inversion and reliable estimation of heat transfer parameters, improving the reproducibility and traceability of the detection.

[0028] By combining the synergistic effects of the above-mentioned technical features, this invention establishes a stable, controllable, and recyclable bonding and measurement interface in the context of rough, dusty, and complex building wall surfaces. Through multi-physics distributed sensing and phased control, it obtains high-quality interface temperature fields and thermal insulation performance parameters, balancing accuracy, efficiency, and maintenance economy. It is suitable for various application scenarios such as quality verification of new construction projects, energy-saving diagnosis of existing buildings, and evaluation of energy-saving renovation effects. Attached Figure Description

[0029] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is an exploded view of the entire invention; Figure 3 This is a partial exploded view of the present invention; Figure 4 This is a front view of the present invention; Figure 5 For the present invention Figure 4 Sectional view of AA; Figure 6 For the present invention Figure 5 Enlarged view at point B in the middle; Figure 7 This is a structural diagram of the present invention.

[0030] Explanation of the labels in the diagram 1. Annular support frame; 2. Hybrid material layer; 3. First electromagnetic coil; 4. Second electromagnetic coil; 5. Electrical interface electrode; 6. Partition plate; 7. Filter layer; 8. Return plate; 9. Housing. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the directional concepts of "left", "right", "up", "down", "front", "back", "inner", and "outer" in the following scheme are all relative directions, and will not be listed one by one here.

[0033] Example 1 like Figures 1 to 7As shown, Example 1 is constructed based on the basic structure and material system, and is designed for testing the thermal insulation performance of walls in construction sites. The device uses a ring-shaped support frame 1 as the main load-bearing component. The contact side of the ring-shaped support frame 1 faces the wall to be tested, and the outer edge of the contact side is continuously covered with a ring-shaped mixed material layer 2. A partition plate 6, a filter layer 7, and a return plate 8 are sequentially fixedly connected to the end of the ring-shaped support frame 1 away from the ring-shaped mixed material layer 2. A housing 9 is fixedly connected to the end of the return plate 8 away from the filter layer 7. The housing 9 is a hollow structure and is equipped with a support interface, which is used for assembly connection and positioning with an external support mechanism or a mobile platform. A first electromagnetic coil 3 is embedded in the inner edge of the ring-shaped support frame 1, and a second electromagnetic coil 4 is embedded in the outer edge. Both the first electromagnetic coil 3 and the second electromagnetic coil 4 are connected to the controller using independent leads. Several electrical interface electrodes 5 are embedded on the ring-shaped support frame 1 between the first electromagnetic coil 3 and the second electromagnetic coil 4. The electrical interface electrodes 5 are connected to the high-impedance measurement channel and excitation channel of the controller through wires. Conventional temperature sensor components are evenly distributed on the ring support frame 1. These components are connected to the temperature acquisition channel of the controller, forming a multi-point reference temperature sampling network. The controller is electrically connected to the first electromagnetic coil 3, the second electromagnetic coil 4, the electrical interface electrode 5, and the conventional temperature sensor components. The controller contains a status control module, a temperature measurement module, and a data processing module, which are interconnected via a bus and managed in a unified timing manner by the main control unit.

[0034] The annular support frame 1 is a one-piece aluminum alloy structure with a groove-shaped cross-section, forming a coil receiving cavity and an electrode routing groove. The first electromagnetic coil 3 is wound in the inner edge receiving cavity, and the second electromagnetic coil 4 is wound in the outer edge receiving cavity. Both the first electromagnetic coil 3 and the second electromagnetic coil 4 use heat-resistant enameled copper wire, and the single-turn resistance is controlled within a stable range to improve the reproducibility of the magnetic field response. The coil frame uses high-temperature resistant insulating material and is bonded and cured to the annular support frame 1. The electrical interface electrode 5 is a corrosion-resistant metal electrode sheet with an inert coating to reduce the polarization pair effect between it and the annular hybrid material layer 2. The electrode sheet is fixed to the annular array position of the annular support frame 1 by insulating inserts. The electrode spacing is equidistant in the circumference to form a multi-segment impedance measurement baseline. The conventional temperature sensor assembly adopts a hybrid scheme of platinum resistance or thermistor. The sensor probe is embedded in the annular support frame 1 near the back of the annular hybrid material layer 2 to ensure that the reference temperature data is comparable to the interface temperature field.

[0035] The housing 9 is connected to the return plate 8 through a seal. The housing 9 forms a material storage chamber and a recovery chamber. The partition 6 and the filter layer 7 are located on the inlet side of the material circuit. The filter layer 7 is a multi-stage pore size composite filter. The outer layer with a larger pore size is used to trap solid impurity particles, and the inner layer with a smaller pore size is used to trap fine particles and bubbles. The return plate 8 guides the material after passing through the filter layer 7 back to the supply channel of the annular mixed material layer 2. The supply channel is connected to the annular mixed material layer 2 through the micro-channel in the annular support frame 1 to form a closed circulation loop.

[0036] The annular hybrid material layer 2 is a magnetorheological-keyhole gel integrated hybrid material. The formulation range by mass percentage is: 40%–80% reversible gel matrix component, 10%–40% magnetically responsive particle component, 5%–20% conductive and / or ionicly conductive component, and 1%–10% reversible crosslinking control component.

[0037] The typical formulation used in this embodiment is as follows: 55% polyvinyl alcohol gel matrix, 25% ferrite particles (average particle size 1-3 μm), 8% polyaniline conductive polymer, 7% sodium sulfate electrolyte, and 5% pH-responsive crosslinking agent. The key performance parameters of the mixed material are: room temperature viscosity 100-500 mPa·s, magnetization >20 emu / g, conductivity 10⁻³-10⁻¹ S / cm, and gelation time controllable within the range of 30-300 seconds. The reversible gel matrix component is composed of a hydrogel matrix and an organic gel matrix. The hydrogel matrix is ​​selected from polyvinyl alcohol gel and acrylamide gel and cured with a crosslinking agent. The organic gel matrix is ​​selected from polyurethane gel and silicone rubber gel and cured by room temperature additional curing or addition curing. The magnetically responsive particle component is composed of a mixture of ferrite particles and metallic magnetic microparticles. The particle surface is modified with a coupling agent to improve the dispersion stability and interfacial compatibility in the reversible gel matrix component. The conductive and / or ionicly conductive components are compounded from a conductive polymer dispersion and a dissociable salt electrolyte, with a small amount of carbon nanomaterials introduced to improve impedance measurability in the low- to mid-frequency range. The reversible crosslinking control component is used to adjust the network crosslinking density under applied electrical signals or temperature changes, achieving a reversible transition from a fluid state to a gel state and degelling recovery. In preparation, the reversible gel matrix component and the reversible crosslinking control component are first mixed to form a matrix sol. Then, under inert conditions, the magnetically responsive particle component is dispersed, and the conductive and / or ionicly conductive components are added. A planetary degassing and mixing process is used until no visible bubbles are visible in the system. This mixture is then filled into the outer edge of the bonding side of the annular support frame 1 to form a continuously coated annular mixed material layer 2. The outer surface of the annular mixed material layer 2 is polished and plasma surface activated to ensure stable adhesion to the wall surface.

[0038] After assembly, the controller parameters are tuned. The state control module independently configures the on / off state, current amplitude, and waveform of the first electromagnetic coil 3 and the second electromagnetic coil 4 to form a radial differential magnetic field distribution. The field on the side of the first electromagnetic coil 3 is mainly used to maintain the response stability of the inner edge region of the annular hybrid material layer 2, while the field on the side of the second electromagnetic coil 4 is mainly used to form a reinforcing sealing strip in the outer edge region. The temperature measurement module sets the excitation and acquisition timing of the electrical interface electrode 5, and uses a multi-frequency AC small signal method to measure the resistance and impedance spectrum of the annular hybrid material layer 2 between each electrode unit. The sampling window is time-staggered with the excitation windows of the first electromagnetic coil 3 and the second electromagnetic coil 4 to avoid electromagnetic coupling interference to the electrical measurement. The channels of the conventional temperature sensor assembly sample in the same clock domain. The temperature measurement module acquires reference temperature data once before and once after each electrical measurement to form a temperature anchor point. The data processing module has a built-in temperature response model for hybrid materials. The model uses the parameters obtained from the calibration test as initial values. The inputs are the impedance data of each electrode pair, the magnetic response data of the coil side, and the reference temperature data of the conventional temperature sensor components. The output is the temperature distribution estimate of the area where the annular hybrid material layer 2 is attached to the wall and the corresponding thermal insulation performance parameters.

[0039] The temperature response model employs a multivariate nonlinear regression equation: Where R is the magnitude of the complex impedance. For the change in inductive resistance, It is the tangent of the magnetic loss angle. The reference temperature is used. The model was calibrated with 200 sets of standard samples, and the root mean square error of temperature prediction is <0.15°C. The thermal insulation performance parameters are calculated using a one-dimensional steady-state thermal conductivity equation, combined with an interface correction coefficient (typical value 0.85-0.95) for compensation. The data processing module performs bandpass filtering and phase unification on the raw data, and then performs impedance-temperature mapping for the circumferential electrode partitions and fusion of magnetic loss-temperature mapping for the coil side. The fusion result is corrected with reference temperature data and outputs the interface temperature field. Then, by correlating the temperature gradient within the steady-state or quasi-steady-state time window with the known excitation conditions, the thermal conductivity-related parameters are calculated and the detection result curve is generated.

[0040] During operation, the operator connects the device to the external support mechanism via the bracket interface, ensuring the contact side of the annular support frame 1 faces the wall, and gently presses the annular hybrid material layer 2 onto the wall surface. After the controller is activated, the state control module first maintains the first electromagnetic coil 3 and the second electromagnetic coil 4 in a low magnetic field state. The annular hybrid material layer 2 is in a soft state, and its surface rapidly spreads under the influence of the wall roughness, filling tiny pores and unevenness. Once the contact is stable, the state control module increases the current of the second electromagnetic coil 4, forming an annular sealing band near the outer edge of the annular support frame 1, stabilizing the contact boundary. The temperature measurement module then applies AC micro-excitation to the electrical interface electrode 5 according to a preset frequency sequence and collects the impedance spectrum of each electrode unit. During this process, the first electromagnetic coil 3 maintains a low-amplitude stable magnetic field to ensure the repeatability of the response of the annular hybrid material layer 2. The conventional temperature sensor assembly collects the reference temperature before and after each measurement cycle. The data processing module aligns the electrical response, magnetic response, and reference temperature using the same sampling timestamp, outputs the interface temperature distribution, and calculates the thermal insulation performance parameters. If multiple measurements are required on the same wall surface, the operator removes the support, moves to the next position, and repeats the above process. At the end of the test, the state control module reduces the field strength of the first electromagnetic coil 3 and the second electromagnetic coil 4, and the electrical interface electrode 5 applies a degelation electrical signal. The annular mixed material layer 2 changes from a gel state to a flow state. Guided by the return plate 8, the material returns to the housing 9 through the filter layer 7. Impurity particles are trapped by the filter layer 7, and the surface of the annular mixed material layer 2 returns to a clean state, allowing the device to continue with the next round of testing.

[0041] The continuous annular interface formed by the annular support frame 1 and the annular hybrid material layer 2 creates a stable fit on the rough wall surface, reducing contact thermal resistance fluctuations. Independent drives of the first electromagnetic coil 3 and the second electromagnetic coil 4 construct a radial differential magnetic field, ensuring a stable sealing band at the outer edge and stable response at the inner edge, preventing interference between the fit and measurement states. The circumferential array of the electrical interface electrodes 5 provides multiple electrical paths, allowing the temperature measurement module to acquire the circumferential electrical response distribution. Combining the coil-side magnetic response with the reference temperature of a conventional temperature sensor assembly, the data processing module performs interface temperature field inversion and thermal insulation performance parameter calculation. The data link is continuous and includes a correction mechanism, resulting in stable output. The circuit formed by the partition 6, filter layer 7, and return plate 8 enables the recycling of the annular hybrid material layer 2. The housing 9 provides a closed storage and recycling unit, keeping the material clean and controllable throughout its service life, reducing maintenance costs.

[0042] Example 2 like Figures 1 to 7As shown, Embodiment 2, based on Embodiment 1, focuses on the independent driving strategy of the first electromagnetic coil 3 and the second electromagnetic coil 4, the multi-unit arrangement and impedance spectrum acquisition of the annular circumferential electrical interface electrode 5, the setting of the coil-side magnetic response measurement channel, and the joint calibration and data fusion with conventional temperature sensor components. It also refines the magnetic field gradient formation, measurement timing isolation, data preprocessing, and inversion processes, enabling the device to possess stable and reproducible temperature field reconstruction capabilities in both the radial and circumferential directions of the annular hybrid material layer 2. The structure and materials of the annular support frame 1, annular hybrid material layer 2, partition 6, filter layer 7, return plate 8, and shell 9 are generally consistent with Embodiment 1, with optimizations only made at the wiring channels, shielding layers, and measurement window openings relevant to this embodiment, shortening the signal path and reducing parasitic coupling.

[0043] The first electromagnetic coil 3 and the second electromagnetic coil 4 are driven by a dual-channel full-bridge current. The state control module is configured with a dual-channel current closed loop, each channel including current sampling, error amplification, and pulse width modulation control. The two drive clocks are provided by frequency division of the controller's main clock, and their phases are programmable biased. To form a stable magnetic field gradient in the radial direction of the annular hybrid material layer 2, the second electromagnetic coil 4 outputs a high-amplitude low-frequency excitation during the sealed steady-state stage, while the first electromagnetic coil 3 maintains a low-amplitude DC bias or narrow-band AC to maintain the rheological stability of the inner edge region. After adsorption stabilization, the measurement stage begins, and both excitations switch to measurement-friendly mode. The fundamental wave and its harmonics of the second electromagnetic coil 4 avoid the AC excitation frequency band of the electrical interface electrode 5, while the first electromagnetic coil 3 maintains a small-signal calibration waveform for coil-side magnetic response acquisition. To suppress mutual inductance crosstalk, a conductive shielding layer is added between the coil receiving cavity and the electrode wiring groove inside the annular support frame 1. The shielding layer is connected to the grounding terminal of the housing 9 at a single point to avoid the formation of circulating current.

[0044] The electrical interface electrodes 5 are arranged in multiple groups of electrode units along the circumference of the annular support frame 1. Each group includes an electrode pair and a reference ground electrode. The electrode pair is used for AC small-signal excitation and impedance response acquisition, and the reference ground electrode is used to suppress circumferential common impedance error. Each group of electrode units is arranged at equal angular intervals, covering the entire circumference of the annular hybrid material layer 2. The temperature measurement module divides the electrode units into several sampling segments. Each segment completes multi-frequency measurement within the same time window. The frequency points are swept sequentially from low frequency to mid frequency, with fixed frequency point intervals and fixed excitation amplitudes. Amplitude and phase information are obtained through a four-terminal measurement topology. To reduce the influence of coil excitation on electrical measurements, the frequency sweep time window and the fundamental frequency window of the first electromagnetic coil 3 and the second electromagnetic coil 4 adopt a time-division interleaving strategy. The coil excitation enters silence or retains only a narrow-band small signal for calibration within the electrical measurement window. The silence switching follows the soft-start and soft-stop edges to avoid inducing transient disturbances in the annular hybrid material layer 2. The raw data of each electrode unit enters the front-end processing link of the temperature measurement module. First, amplitude and phase consistency correction and reference ground elimination are performed, and then multi-frequency fitting is performed to obtain the complex impedance characteristics of each electrode segment, including amplitude, phase and spectral parameters.

[0045] The coil-side magnetic response acquisition channel consists of two parts. The first part is the online detection of the self-inductance and equivalent resistance of the first electromagnetic coil 3 and the second electromagnetic coil 4. The effective inductance and loss parameters under small signal conditions are obtained by using the drive bridge circuit readback method. The second part is the induced voltage monitoring branch, which picks up the magnetic field change signal near the material layer through the auxiliary detection winding to form a secondary observation related to magnetic loss. After the two types of raw magnetic response quantities are channel registered and amplitude-phase corrected by the temperature measurement module, they are aligned with the complex impedance characteristics of the electrical interface electrode 5 on the same time axis to generate a multi-physics field observation vector for a single measurement cycle.

[0046] A conventional temperature sensor assembly consists of several probes distributed circumferentially within a ring-shaped support frame 1. Each probe is located near the back side of the ring-shaped hybrid material layer 2. The temperature measurement module samples the data once before and after each electrical and magnetic observation, and the sampling results form reference temperature anchor points before and after each cycle. The data processing module receives three data streams: an electrical complex impedance characteristic sequence, a magnetic response characteristic sequence, and a reference temperature anchor point sequence. The data processing module first performs spatial interpolation on each circumferential electrode segment to establish a circumferentially equidistant sampling grid. Subsequently, the electrical and magnetic characteristics are fused within this grid using a weighted combination strategy. The weights are adaptively provided by a pre-stored hybrid material temperature response model based on frequency, amplitude and phase parameters, and coil operating conditions. The fusion result yields a coarse estimate of the circumferential temperature response. To incorporate radial information into the estimation, the data processing module introduces a radial weight function determined by the current ratio and phase offset of the first electromagnetic coil 3 and the second electromagnetic coil 4. This function maps the difference in temperature sensitivity between the inner and outer edges into the response model, forming a two-dimensional temperature field estimate in the circumferential × radial direction. The two-dimensional temperature field is subjected to zero bias and slope correction under the constraint of a reference temperature anchor point with the same period. The correction adopts a two-level strategy of local linear correction plus global consistency constraint. First, the local drift is corrected by using the neighborhood of each sensor as a window. Then, the energy minimization criterion of the whole loop is used to ensure that the corrected temperature field is continuous in the circumference and consistent with the reference anchor point.

[0047] During operation, after the operator completes the bonding of the annular hybrid material layer 2 and the formation of the outer sealing strip according to the bonding and basic steady-state establishment process in Example 1, the state control module enters the measurement-friendly mode. The second electromagnetic coil 4 maintains a low-disturbance steady state or sweeps the frequency at a set small amplitude, while the first electromagnetic coil 3 provides narrow-band small-signal calibration excitation. The temperature measurement module starts the frequency sweep of each electrode unit according to the preset segment sequence. After the single-segment measurement is completed, the magnetic response sampling of the coil side of the corresponding circumferential partition is immediately triggered, and the two types of observations are aligned within the subframe. After all circumferential segments are completed, the data processing module immediately performs data fusion, reference anchor point correction, and two-dimensional temperature field reconstruction for this cycle. Subsequently, based on the temperature distribution within the steady-state or quasi-steady-state time window of the wall, combined with the known excitation and boundary conditions, the thermal insulation performance parameters are calculated and the results of the current measurement point are output. When a fine-grained circumferential distribution on the wall surface is required, the operator does not move the device. Instead, by initiating multi-cycle measurements and changing the current ratio of the first electromagnetic coil 3 to the second electromagnetic coil 4 within the state control module, several sets of observations under different radial weighting functions are obtained. The data processing module then performs joint inversion on multiple sets of observations to improve the resolution of the radial temperature gradient at the bonding interface. When multi-position measurements are required, movement control is accomplished by an external support mechanism. The above process is repeated once the device reaches the next position.

[0048] The beneficial effects of this embodiment are reflected in the following aspects. The independent current closed loop of the first electromagnetic coil 3 and the second electromagnetic coil 4 and the programmable phase bias construct a stable and adjustable magnetic field gradient in the radial direction of the annular hybrid material layer 2, so that the outer edge region maintains high stiffness under sealed steady state, and the inner edge region maintains sufficient rheological sensitivity during adsorption and measurement stages, the interface thermal contact is stable and the measurement repeatability is improved.

[0049] Quantitative test results show that the magnetic field gradient control accuracy reaches ±0.1 mT / mm, and the material viscosity adjustment range covers three orders of magnitude (10²-10). 5 The sealing pressure stability is better than ±1% (mPa·s). The signal-to-noise ratio of electrical measurements is improved by 40dB compared to traditional methods, and the temperature sensitivity of magnetic measurements reaches 5Ω / °C. After dual-mode fusion, the temperature resolution is improved to 0.05°C. The segmented frequency sweep and time-division interleaving strategy of the electrical interface electrode 5, combined with the silent window on the coil side, significantly reduces the crosstalk of magnetic excitation disturbances to electrical measurements, and ensures the amplitude and phase consistency of the complex impedance characteristics. The online reading back of the magnetic response of the first electromagnetic coil 3 and the second electromagnetic coil 4, together with the inductance of the auxiliary detection winding, constitutes an independent observation of the magnetic loss and equivalent permeability of the material layer, providing the data processing module with an information source complementary to the electrical path. After fusion, the sensitivity to temperature is improved and the robustness to material aging and moisture content fluctuations is enhanced. The circumferential distribution of conventional temperature sensor components provides front and rear anchor points within the same period. The data processing module performs local and global two-level corrections in the two-dimensional temperature field estimation, eliminating slow drift and baseline errors. The output temperature field is continuous in both the circumferential and radial directions. The calculation of thermal insulation performance parameters does not depend on single-point measurements, resulting in a smooth curve with minimal fluctuations, adaptable to different wall materials and surface roughness conditions. In summary, Example 2, through the systematic design of electromagnetic drive, measurement timing, circumferential electrode network, and multi-source data fusion, enables the device to achieve higher temperature field reconstruction accuracy and detection result stability without changing the overall mechanical and material foundation of Example 1. This facilitates continuous, multi-point, and highly consistent thermal insulation performance evaluation on-site in construction projects.

[0050] Example 3 like Figures 1 to 7 As shown, in Example 3, based on Examples 1 and 2, a recycling channel is added along the outer region of the annular support frame 1, forming a closed loop with an external negative pressure source. Simultaneously, the controller enables consistent scheduling of the two processes, S1-S4 and A1-A4, allowing for coordinated operation of stage switching (bonding, sealing and penetration, detection, degumming and collection), material circulation, surface self-cleaning, and continuous multi-position detection. This example only fully discloses the structures, working processes, and data links not detailed in Examples 1 and 2; identical basic structures and material systems are omitted.

[0051] The recovery channel forms a closed circumferential flow path around the outer region of the annular support frame 1 and is connected to an external negative pressure source via a flexible vacuum tube. The recovery channel connects to the back side of the annular mixed material layer 2 via several radial micropores inside the annular support frame 1, and merges into the inlet of the return plate 8 via a confluence section on the outer side. It then passes sequentially through the filter layer 7 and the partition plate 6, finally entering the shell 9 to form a circulation loop. The circumferential section of the recovery channel uses a swelling-resistant polymer tubing embedded in the outer edge groove of the annular support frame 1, with a microporous support mesh laid at the bottom of the groove to prevent local collapse under negative pressure. The radial micropores and the confluence position of the return plate 8 are distributed at equal angles to ensure that the material recovered from each circumferential section of the annular mixed material layer 2 is uniformly mixed before entering the filter layer 7, avoiding local contamination accumulation. To suppress bubble entrainment, an expansion-contraction transition section is set between the return plate 8 and the filter layer 7. The expansion section reduces the flow rate to promote the floating of microbubbles, while the contraction section restores the flow rate before entering the filter layer 7 to ensure filtration efficiency. Removable support meshes are provided on both the inner and outer sides of the filter layer 7, facilitating complete removal for cleaning or replacement during maintenance. The interior of the housing 9 is divided into a material storage chamber and a recovery chamber. The recovery chamber communicates with the return plate 8, and the material storage chamber is connected to the recovery chamber via a one-way flow-limiting orifice plate to stabilize the circuit pressure drop and reduce the impact of flow fluctuations from the negative pressure source on the annular mixed material layer 2. A gas-liquid separation space and an exhaust port are provided at the top of the housing 9. The exhaust port is connected to the environment via a microporous silencer to prevent noise and backflow caused by instantaneous pressure relief.

[0052] An adjustable-speed vacuum pump is used as the external negative pressure source, with a buffer tank placed at the inlet to smooth out pressure pulsations. A vacuum regulating valve and an electromagnetic isolation valve are installed after the buffer tank. The vacuum regulating valve is used to set the target negative pressure during the recovery stage, while the electromagnetic isolation valve is controlled by the state control module and only opens during the degumming and recovery windows. To monitor the circuit status, pressure and flow sensor nodes are arranged upstream of the recovery channel, before filter layer 7, and inside the housing 9, respectively. The node signals are input to the controller and used by the state control module for threshold determination and interlock protection. When an increase in filter resistance or an abnormal bubble ratio is detected, the state control module triggers a short-term pulsating negative pressure purge or switches to a bypass branch to prevent the filter layer 7 from being momentarily blocked.

[0053] The scheduling strategy for the newly added recycling link in the controller for this embodiment is as follows. In stage S1, the first electromagnetic coil 3 and the second electromagnetic coil 4 are in a de-energized or low-magnetic-field state. The electrical interface electrode 5 is not excited, the external negative pressure source isolation valve is closed, and the recycling channel remains stationary, maintaining only the static pressure balance between the housing 9 and the return plate 8. In stage S2, the second electromagnetic coil 4 gradually increases current to form an outer annular sealing strip. The electrical interface electrode 5 applies a first electrical signal, guiding the annular mixed material layer 2 to penetrate and gel in the wall's micropores and rough gaps. The recycling channel remains isolated. In stage S3, electrical and magnetic data are collected according to the measurement-friendly mode of embodiment 2. The state control module keeps the recycling channel closed to prevent the influence of trace backflow on interface stability. If the pressure node detects leakage due to environmental disturbance, the controller only performs a very short pulse suction and discharge from the external negative pressure source to recover the leaked material, without entering a continuous recycling state. In stage S4, the state control module first switches the magnetic field distribution of the first electromagnetic coil 3 and the second electromagnetic coil 4 to soften the side near the wall and maintain rigidity the side near the annular support frame 1. At the same time, the electrical interface electrode 5 applies a debonding electrical signal, causing the annular mixed material layer 2 to enter a flow dynamic state. After the pressure node confirms that the bonding interface has relaxed, the external negative pressure source isolation valve is opened and the negative pressure is increased according to the step curve. The material enters the recycling channel along the radial micropores, is introduced into the filter layer 7 through the return plate 8, and enters the housing 9. Impurities are intercepted by the filter layer 7. To avoid the material carrying out wall powder particles and re-contaminating the interface, the negative pressure curve adopts a small slope in the early stage of S4 and is combined with the low-amplitude oscillation of the second electromagnetic coil 4 to cause the residual powder particles to turn outward and be carried into the recycling channel. After the return flow reaches a stable threshold, it enters the constant pressure stage until the interface sensor determines that the material layer thickness has dropped to the set lower limit. Then, the negative pressure is slowly reduced and the isolation valve is closed, completing one round of recycling. Once recycling is complete, the state control module applies a short reverse pulse towards the return plate 8 to purge the deposits on the surface of the filter layer 7. Then, the outer surface of the annular mixed material layer 2 is moved at a low and uniform speed relative to the wall for several millimeters. The mechanical scraping is completed by utilizing the edge stiffness to maintain the flanging effect. The remaining trace materials are carried away in the next round of recycling.

[0054] The movement control module is linked to the recycling process to ensure controllable material circulation and interface cleanliness during continuous multi-location detection. After S4 of a single measuring point is completed, the movement control module issues a displacement command when it confirms that the recycling channel is closed and the liquid level in the shell 9 is within a safe range. This causes the support mechanism to move along a preset path on the wall to the next measuring point. The path is planned using a rectangular grid or honeycomb grid. The center distance between adjacent measuring points is determined based on the wall material and external insulation structure, and is usually selected as 1.2 to 1.5 times the outer diameter of the ring support frame 1 to balance spatial coverage and measurement efficiency. After reaching the position, the movement control module writes the position information into the controller's shared memory. The state control module then resets the initial currents of the first electromagnetic coil 3 and the second electromagnetic coil 4 and enters S1 to complete the next cycle. To prevent air bubbles from entering the circuit inside the shell 9 due to vibration during movement, the controller first performs a slight compensation on the negative pressure of the recycling chamber before movement, guiding free air bubbles to the gas-liquid separation space. The bypass is closed during movement, and static pressure balance is restored after reaching the position.

[0055] The data processing module maintains the same multiphysics fusion and temperature field inversion process as in Example 2, but introduces mechanical and fluid state markers in this example to eliminate unsteady-state segments during the recovery-fitting transition period. Specifically, each measurement cycle includes timestamps for the recovery channel pressure, flow rate, and isolation valve status. The data processing module only receives electrical and magnetic observations within the S3 steady-state window and updates with zero bias using the reference temperature anchor point from the end of S1 to the S2 steady-state interval to ensure temperature scale consistency between consecutive measurement points. After multi-location detection is completed, the data processing module generates a wall zoning level map and weak area alerts based on the position sequence provided by the motion control module and the thermal insulation performance parameters output at each point. It also records the pressure difference of the filter layer 7 and the liquid level change of the shell 9 corresponding to each point in the background for reference in maintenance and material replenishment strategies.

[0056] During operation, the operator first fixes the device to the external support mechanism via the bracket interface of the housing 9, connects the external negative pressure source, and checks the sealing of the recovery channel. Then, the operator executes S1 to S4 sequentially according to the set program. After the single-point detection is completed and the material recovery is finished, the movement control module drives the device to the next point along the path, repeating the process until the target area is covered. During maintenance, the operator determines whether cleaning or material replenishment is needed based on the cumulative change in the pressure difference across the filter layer 7 and the liquid level in the housing 9. When the pressure difference of the filter layer 7 is detected to be continuously exceeding the limit, the controller prompts for replacement or online backwashing. Backwashing is achieved through a short-term reverse pressure difference and a small amount of cleaning fluid. The cleaning fluid is collected through a dedicated circuit and does not enter the channel of the annular mixed material layer 2.

[0057] By setting a recycling channel connected to an external negative pressure source in the outer area of ​​the annular support frame 1 and forming a closed loop with the return plate 8, filter layer 7, partition 6, and shell 9, the annular mixed material layer 2 can be quickly recycled and the interface can be self-cleaned after degumming, which significantly reduces the risk of impurity accumulation and cross-contamination. Actual test data shows: material recovery rate >95%, recovery time <60 seconds, and filtration efficiency >99.5% (for particles >10μm). In 500 consecutive cycles of testing, material performance degradation <2%, and contact thermal resistance change <5%. The positional accuracy of multi-location detection is ±2mm, and after path planning optimization, the detection efficiency reaches 25 points / hour, more than 10 times higher than traditional methods. Through multi-node monitoring of pressure and flow and staged control of the negative pressure curve, the recovery process is stable and controllable, without damaging the bonding surface substrate. The linkage between the movement control module and the recovery process ensures the consistency of material circulation, interface cleaning, and steady-state measurement sequence during continuous multi-location detection, improving the reproducibility of results and the continuity of spatial mapping. By introducing fluid and valve-state markers in the data processing module, non-steady-state observations are eliminated, avoiding deviations in insulation performance parameter estimation caused by the recovery-bonding transition. The overall solution balances on-site maintainability, material reusability, and detection accuracy, making it suitable for continuous insulation performance verification and rapid screening of defect areas in large-area walls.

[0058] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A device for testing the thermal insulation performance of building walls, characterized in that, include: A ring-shaped support frame (1) has one side facing the wall to be measured; An annular hybrid material layer (2) is disposed on the outer edge of the fitting side, and the hybrid material layer (2) is continuously disposed along the circumference of the annular support frame (1); A partition (6) is fixedly connected to one end of the annular support frame (1) away from the mixed material layer (2). A filter layer (7) is fixedly connected to one end of the partition (6) away from the annular support frame (1). A return plate (8) is fixedly connected to one end of the filter layer (7) away from the partition (6). A housing (9) is fixedly connected to one end of the return plate (8) away from the filter layer (7). The housing (9) is a hollow structure and has a support interface. The inner edge of the ring support frame (1) is provided with a first electromagnetic coil (3) and the outer edge is provided with a second electromagnetic coil (4). The first electromagnetic coil (3) and the second electromagnetic coil (4) can be energized independently to generate a spatially controllable magnetic field in the hybrid material layer (2). A plurality of electrical interface electrodes (5) are provided between the first electromagnetic coil (3) and the second electromagnetic coil (4). The electrical interface electrodes (5) are disposed on the annular support frame (1) and are in electrical contact with the hybrid material layer (2). The annular support frame (1) is equipped with a conventional temperature sensor assembly; It also includes a controller, which is electrically connected to the first electromagnetic coil (3), the second electromagnetic coil (4), the electrical interface electrode (5), and the conventional temperature sensor assembly, respectively; The controller includes: a state control module, which controls the on / off state, current magnitude and waveform of the first electromagnetic coil (3) and the second electromagnetic coil (4), and controls the electrical interface electrode (5) to apply an electrical signal; a temperature measurement module, which collects the electrical response data of the hybrid material layer (2) and / or the magnetic response data of the first electromagnetic coil (3) and the second electromagnetic coil (4), and combines it with the reference temperature data of the conventional temperature sensor assembly; and a data processing module, which inverts the temperature distribution of the wall bonding area and calculates the wall insulation performance parameters based on the measurement data obtained by the temperature measurement module and in combination with the pre-calibrated hybrid material temperature response model. The hybrid material layer (2) is composed of the following components by mass percentage: 40% to 80% reversible gel matrix component, 10% to 40% magnetically responsive particle component, 5% to 20% conductive and / or ionicly conductive component, and 1% to 10% reversible crosslinking control component.

2. The building wall insulation performance testing device as described in claim 1, characterized in that, The reversible gel matrix component is a hydrogel matrix and / or an organic gel matrix; the hydrogel matrix is ​​selected from any one or combination of polyvinyl alcohol gel, polyacrylamide gel, and acrylic copolymer gel; the organic gel matrix is ​​selected from any one or combination of polyurethane gel and silicone rubber gel; the magnetically responsive particle component is any one or combination of ferrite particles, carbon-based magnetic particles, or metallic magnetic microparticles, and is surface modified to improve the dispersion stability in the reversible gel matrix component; the conductive and / or ionicly conductive component is any one or combination of conductive polymers, carbon nanomaterials, or dissociable salt electrolytes.

3. The building wall insulation performance testing device as described in claim 1, characterized in that, The first electromagnetic coil (3) and the second electromagnetic coil (4) are driven independently by the state control module to form a magnetic field gradient distribution in the radial direction of the mixed material layer (2), so that the mixed material area near the outer edge of the annular support frame (1) is in a rigid state during the sealing stage, the mixed material area near the wall side remains fluid during the adsorption stage, and the magnetic field distribution is switched to softening near the wall side and maintaining rigidity near the annular support frame (1) side during the recycling stage.

4. The building wall insulation performance testing device as described in claim 1, characterized in that, The electrical interface electrodes (5) are arranged in multiple electrode units at circumferential intervals along the annular support frame (1). Each electrode unit includes an electrode pair for impedance measurement. The temperature measurement module is used to obtain resistance and / or impedance spectrum data of the hybrid material layer (2) at multiple circumferential locations. The data processing module is used to reconstruct the temperature distribution along the circumferential direction of the wall bonding area based on the circumferentially distributed electrical response data.

5. The building wall insulation performance testing device as described in claim 1, characterized in that, The temperature measurement module is used to obtain data on the changes in magnetic loss, induced voltage and / or permeability of the hybrid material layer (2) over time based on the relationship between the excitation current and magnetic response of the first electromagnetic coil (3) and the second electromagnetic coil (4) during the detection phase. The data processing module is used to input the magnetic response data, the electrical response data and the measurement data of the conventional temperature sensor assembly into the hybrid material temperature response model to obtain the interface temperature estimate.

6. The building wall insulation performance testing device as described in claim 1, characterized in that, The conventional temperature sensor assembly includes multiple temperature sensors distributed at different circumferential positions on the annular support frame (1), each temperature sensor being located near the back of the hybrid material layer (2), and the data processing module is used to correct the temperature field obtained by inversion based on the electrical and / or magnetic response of the hybrid material layer (2) based on the measured values ​​of each temperature sensor.

7. The building wall insulation performance testing device as described in claim 1, characterized in that, The annular support frame (1) is provided with a recycling channel connected to an external negative pressure source along the outer region of the mixed material layer (2). The state control module controls the recycling channel to be connected to the external negative pressure source during the mixed material recycling stage, so that the mixed material in the flow state is sucked into the recycling cavity along the recycling channel after degumming.

8. The building wall thermal insulation performance testing device as described in claim 1, characterized in that, The controller is configured to execute the following control flow: S1: The annular mixed material layer (2) is attached to the wall surface under power-off or low magnetic field conditions, so that the mixed material layer (2) is in a soft flow state and spreads on the wall surface; S2: Increase the current of the second electromagnetic coil (4) to form an annular sealing strip in the mixed material area near the outer edge of the annular support frame (1), and apply a first electrical signal to the mixed material area near the wall through the electrical interface electrode (5) so that the mixed material penetrates and gels in the micropores and rough gaps on the wall surface. S3: Apply an electromagnetic field for detection and / or apply an alternating current signal for detection, collect the electrical response data and / or magnetic response data of the hybrid material layer (2), and combine it with the reference temperature data of the conventional temperature sensor assembly. The data processing module then inverts the temperature field of the wall-fitting area and calculates the wall insulation performance parameters. S4: Change the magnetic field distribution of the first electromagnetic coil (3) and the second electromagnetic coil (4) and / or apply a degelling electrical signal through the electrical interface electrode (5) to restore the mixed material layer (2) from a gel state to a flow state, and cause the mixed material to detach from the wall surface and be collected.

9. The building wall insulation performance testing device as described in claim 1, characterized in that, The controller includes a motion control module, which is electrically connected to a motion drive mechanism and / or positioning component disposed on the annular support frame (1). After completing the thermal insulation performance test at one test position, the controller controls the annular support frame (1) to move along the wall surface to the next test position and repeats the S1 to S4 of claim 8 at different test positions.

10. The building wall insulation performance testing device as described in claim 8, characterized in that, The implementation method of the control process includes the following steps: A1: Place the bonding side of the annular support frame (1) close to the wall surface, so that the annular mixed material layer (2) is in a soft flow state under power failure or low magnetic field conditions and completes bonding and spreading; A2: Increase the current of the second electromagnetic coil (4) and apply a first electrical signal through the electrical interface electrode (5) to form an annular sealing strip in the outer edge region of the annular mixed material layer (2), and the mixed material in the inner edge region penetrates into the micropores of the wall surface and gels. A3: Apply an electromagnetic field for detection and collect electrical response data of the annular hybrid material layer (2) through the electrical interface electrode (5), and simultaneously collect temperature measurement data of the conventional temperature sensor assembly. The data processing module inverts the temperature field of the wall-fitting area and calculates the wall insulation performance parameters. A4: After the test is completed, the magnetic field distribution of the first electromagnetic coil (3) and the second electromagnetic coil (4) is changed and / or a degelation electrical signal is applied through the electrical interface electrode (5) to restore the annular mixed material layer (2) from the gel state to the flow state, and the mixed material is detached from the wall surface and collected under negative pressure recovery or gravity.

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