Vacuum glass thermal insulation performance detection device and detection method

Abstract

The invention provides a vacuum glass thermal insulation performance detection device and method, the detection device comprises a temperature control assembly, a heat flow sensing assembly and a signal conversion assembly, the temperature control assembly is used for generating and maintaining a heat source output of a set temperature; the heat flow sensing assembly is arranged on the opposite side of the output path of the heat source and is used for receiving a heat flow signal penetrating through the vacuum glass to be detected and generating sensing data; the signal conversion assembly is connected with the heat flow sensing assembly and used for converting the sensing data into electric signal parameters, and the electric signal parameters represent detection results. According to the device, the heat flow penetrating through the glass is directly obtained through the heat flow sensing assembly, the direct influence of the environment temperature on the temperature measuring element is avoided, and the problem that the test result is large in fluctuation is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum glass, and particularly relates to a vacuum glass heat preservation performance detection device and a detection method. BACKGROUND

[0002] Vacuum glass is a glass product formed by two flat glass plates separated by a support and sealed around, and a vacuum layer is formed between the glass. Compared with other types of glass, vacuum glass has excellent heat preservation characteristics due to the existence of the vacuum layer. Vacuum glass has an ultra-low heat conduction coefficient and is an energy-saving material for high-end wine cabinets and vertical refrigerator door bodies. The U value of the vacuum glass can be as low as 0.4 W / (m 2 ·K), which significantly improves the heat preservation performance of the equipment.

[0003] There is a need for quantitative evaluation of the long-term heat preservation performance of vacuum glass in the household appliance field, and in particular, the problem of rapid quality inspection in a mass production environment needs to be solved. The GB / T 34342-2017 standard provides a method for detecting the heat conduction coefficient of an envelope structure. This scheme requires the construction of a constant temperature enclosure and continuous testing for 24 hours. There are also some vacuum glass heat transfer performance testing devices that use copper plate heating combined with distributed thermocouples to measure temperature. The thermal resistance value is obtained by calculating the temperature gradient.

[0004] In the above-mentioned scheme, the GB / T 34342-2017 method has high equipment costs and a long detection period due to strict environmental control. Although the vacuum glass heat transfer performance testing device shortens the single test time, the direct temperature measurement by the distributed thermocouples is easily disturbed by environmental temperature fluctuations, and the test results fluctuate greatly. SUMMARY

[0005] The present application provides a vacuum glass heat preservation performance detection device and a detection method to solve the problem of large fluctuations in test results.

[0006] In a first aspect, the present application provides a vacuum glass heat preservation performance detection device, comprising:

[0007] A temperature control component for generating and maintaining a heat source output at a set temperature;

[0008] A heat flow sensing component arranged on the opposite side of the output path of the heat source for receiving a heat flow signal penetrating the vacuum glass to be tested and generating sensing data;

[0009] A signal conversion component connected to the heat flow sensing component for converting the sensing data into an electrical signal parameter, and the electrical signal parameter represents the detection result.

[0010] In some possible embodiments, the temperature control component includes a liquid circulation device, a constant temperature regulator, and a heat exchange plate.

[0011] The liquid circulation device is connected to the thermostat for controlling the temperature of the liquid;

[0012] The heat exchange plate is connected to the liquid circulation device through a pipeline;

[0013] The liquid circulation device, the thermostat and the heat exchange plate generate and maintain the heat source output at a set temperature.

[0014] In some possible embodiments, the thermostat is a water tank, the liquid circulation device controls the temperature of the liquid through the water tank, and the temperature of the liquid is a preset temperature.

[0015] In some possible embodiments, the heat flow sensing assembly includes a signal receiving plate, a heat flow sensor and a shielding shell;

[0016] The heat flow sensor is arranged inside the signal receiving plate, and the shielding shell covers the signal receiving plate.

[0017] Based on the signal receiving plate and the heat flow sensor, a heat flow signal penetrating the vacuum glass to be detected is generated.

[0018] In some possible embodiments, the signal conversion assembly includes a signal amplifier, an analog-to-digital converter and a parameter processor;

[0019] The signal amplifier is connected to the heat flow sensing assembly and outputs amplified sensing data;

[0020] The analog-to-digital converter converts the amplified sensing data into a digital signal;

[0021] The parameter processor generates an electrical signal parameter representing a detection result according to the digital signal.

[0022] In some possible embodiments, the structure adaptation assembly further includes a fixed base, a height adjustment mechanism and a sample carrying table;

[0023] The height adjustment mechanism is arranged on the fixed base;

[0024] The sample carrying table is connected to the height adjustment mechanism and is used for positioning the vacuum glass to be detected;

[0025] The height adjustment mechanism drives the sample carrying table to move, so that the output path of the heat source vertically penetrates the surface of the vacuum glass to be detected.

[0026] In some possible embodiments, the signal conversion assembly includes a calibration database and a coefficient mapping module;

[0027] The calibration database is used for storing a preset mapping relationship between the electrical signal parameter and the thermal conductivity coefficient.

[0028] The coefficient mapping module is configured to convert the electrical signal parameter into a quantitative thermal insulation performance detection result by calling the preset mapping relationship.

[0029] In a second aspect, the present application provides a vacuum glass thermal insulation performance detection method, comprising:

[0030] The temperature control component is configured to apply a heat source with a set temperature to the vacuum glass to be detected.

[0031] The heat flow sensing component is configured to receive a heat flow signal penetrating the vacuum glass to be detected.

[0032] The signal conversion component is configured to convert the heat flow signal into an electrical signal parameter, which represents a detection result.

[0033] In some possible embodiments, the heat flow sensing component is configured to receive a heat flow signal penetrating the vacuum glass to be detected, comprising:

[0034] The structure adaptation component is configured to attach the first contact surface of the vacuum glass to be detected to the temperature control component, and attach the second contact surface of the vacuum glass to be detected to the heat flow sensing component.

[0035] The output path of the heat source is configured to penetrate the surface of the vacuum glass to be detected vertically.

[0036] In some possible embodiments, the signal conversion component is configured to convert the heat flow signal into an electrical signal parameter, comprising:

[0037] A calibration curve is pre-stored in a calibration database, and the calibration curve is a preset mapping relationship between the electrical signal parameter and the thermal conductivity coefficient.

[0038] The electrical signal parameter is obtained.

[0039] The calibration curve is called based on the electrical signal parameter, and the thermal conductivity coefficient is obtained.

[0040] The thermal conductivity coefficient is output, and the thermal conductivity coefficient is a quantitative thermal insulation performance detection result.

[0041] From the above technical solutions, the application provides a vacuum glass heat preservation performance detection device and a detection method. The detection device comprises a temperature control assembly, a heat flow sensing assembly, and a signal conversion assembly. The temperature control assembly is used to generate and maintain a heat source output at a set temperature. The heat flow sensing assembly is arranged on the opposite side of the output path of the heat source and is used to receive a heat flow signal penetrating the vacuum glass to be detected and generate sensing data. The signal conversion assembly is connected to the heat flow sensing assembly and is used to convert the sensing data into an electrical signal parameter, which represents the detection result. The device directly obtains the heat energy flow penetrating the glass through the heat flow sensing assembly, thereby avoiding the direct influence of the ambient temperature on the temperature measuring element to solve the problem of large fluctuations in the test results. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the present application, the drawings required in the embodiments will be briefly introduced below. Obviously, other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0043] Figure 1 The structure schematic diagram of the vacuum glass heat preservation performance detection device provided by the embodiments of the present application is shown in the figure.

[0044] Figure 2 The flowchart of the detection method provided by the embodiments of the present application is shown in the figure.

[0045] Among them, 100-temperature control assembly, 200-heat flow sensing assembly, 300-signal conversion assembly. DETAILED DESCRIPTION

[0046] The embodiments will be described in detail below, and examples are shown in the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following embodiments do not represent all the embodiments consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as described in detail in the claims.

[0047] The vacuum glass heat transfer performance test device refers to a special device for evaluating the heat preservation performance of vacuum glass, which has application value in industrial quality control and product development.

[0048] Copper plate power heating is a common means of generating heat source in the prior art, which generates Joule heat to form heat output by passing electric current through copper plate. Distributed thermocouple temperature measurement refers to arranging multiple thermocouple sensors in the test area to calculate the temperature gradient by collecting temperature data at different positions. The thermal resistance value is a quantitative index of heat preservation performance calculated by the temperature gradient data, which reflects the ability of the material to prevent heat transfer.

[0049] In the traditional vacuum glass test practice, when the copper plate is powered to heat, the current fluctuation causes the heat source output to be unstable, the temperature changes sharply in the initial heating stage, the distributed thermocouple is directly exposed to the test environment, and the environmental temperature fluctuation directly affects the temperature measurement accuracy of the thermocouple. When the laboratory air flow or temperature changes, the thermocouple output voltage drifts, causing the temperature gradient calculation deviation.

[0050] The process of obtaining the thermal resistance value by calculating the temperature gradient needs multiple point temperature data to participate in the operation. The distortion of a single thermocouple data will be transmitted to the final thermal resistance value, causing the test result to fluctuate. In order to ensure data reliability, the prior art often needs to prolong the stabilization time and increase the number of repeated tests, which significantly reduces the detection efficiency.

[0051] To solve the above problems, some embodiments of the present application provide a vacuum glass heat preservation performance detection device, wherein the temperature control assembly realizes gradual temperature rise through liquid circulation, avoids heat source mutation, the heat flow sensing assembly works in the shielding shell, and is isolated from environmental interference. The signal conversion assembly directly converts the heat flow signal into an electrical signal parameter, eliminates the error transmission path of multi-point temperature measurement, calibrates the mapping relationship between the voltage parameter and the thermal resistance value of the database, and avoids the uncertainty of manual calculation.

[0052] The temperature control assembly buffers thermal shock through liquid medium, and realizes essential stability of heat source output compared with copper plate power heating. The heat flow sensing assembly replaces the distributed thermocouple indirect temperature measurement mode, and avoids environmental interference in principle. The signal conversion assembly cooperates with the calibration database to standardize the physical quantity conversion process and eliminate random errors introduced by manual operation in the traditional method.

[0053] As shown in Figure 1 The device includes a temperature control assembly 100, a heat flow sensing assembly 200, and a signal conversion assembly 300. The temperature control assembly 100 outputs a constant heat flow to one side of the vacuum glass, forming a temperature gradient. After the heat flow penetrates the glass, the heat flow sensing assembly 200 obtains the attenuated heat flow signal, and the signal conversion assembly 300 linearly converts the heat flow signal into an electrical signal parameter, which directly reflects the heat resistance of the glass.

[0054] The signal conversion assembly 300 converts the heat flow signal into an electrical signal parameter, avoids the temperature collection distortion caused by poor contact or position deviation of the traditional thermocouple, and can simplify the device structure while maintaining the measurement accuracy and shorten the test period.

[0055] The temperature control assembly 100 is used to generate and maintain a set temperature heat source output. The temperature control assembly 100 controls the energy source to ensure that a stable and accurate heat flow is applied to the vacuum glass to be tested, so as to provide a controllable heat environment and simulate the state of the glass being heated on one side in actual application.

[0056] The heat flow sensing assembly 200 is arranged on the opposite side of the heat source output path, and is used to receive the heat flow signal penetrating the vacuum glass to be tested and generate sensing data. The heat flow sensing assembly 200 directly contacts the glass surface, acquires the residual heat flow conducted through the glass, and internally integrates a sensing element to convert the thermal physical quantity into a readable signal.

[0057] The signal conversion assembly 300 is connected to the heat flow sensing assembly 200, and is used to convert the sensing data into an electrical signal parameter. For example, the signal conversion assembly 300 can include a signal conditioning circuit and a data processing unit. Through amplification, filtering and quantization steps, the original sensing data is converted into an electrical signal parameter representing the heat preservation performance of the glass, and the electrical signal parameter is inversely proportional to the thermal resistance value.

[0058] In the detection process, first, the temperature control assembly 100 is started, the target temperature is set, and the output is stabilized. The vacuum glass to be tested is placed between the heat source and the heat flow sensing assembly 200, and the heat source output is maintained until the heat flow sensing signal is stabilized. The signal conversion assembly 300 collects the sensing data in real time, and outputs continuous electrical signal parameters through internal circuit processing.

[0059] For example, the operator sets the output temperature of the temperature control assembly 100 to 80°C, and places a vacuum glass sample with a thickness of 8mm (4mm glass, 0.5mm vacuum layer, 4mm glass) horizontally, so that the heat source output surface of the temperature control assembly 100 tightly contacts the upper surface of the glass, and the receiving surface of the heat flow sensing assembly 200 tightly contacts the lower surface of the glass. After 5 minutes of continuous heating, the signal conversion assembly 300 displays an output voltage parameter of 3.5mV. After this parameter is input into a preset algorithm model, it is converted into a thermal conductivity of 0.49W / (m 2 ·K).

[0060] The conventional vacuum glass heat transfer performance test uses a distributed thermocouple to directly measure the temperature, which is easily disturbed by environmental temperature fluctuations, resulting in test result drift. The device provided in the present application directly acquires the heat energy flow penetrating the glass through the heat flow sensing assembly 200, thereby avoiding the direct influence of the environmental temperature on the temperature measuring element.

[0061] In some embodiments, the temperature control assembly 100 includes a liquid circulation device, a thermostat regulator, and a heat exchange plate. The liquid circulation device is connected to the thermostat regulator, and is used to control the temperature of the liquid. The heat exchange plate is connected to the liquid circulation device through a pipeline. The liquid circulation device, the thermostat regulator, and the heat exchange plate generate and maintain a heat source output at a set temperature.

[0062] Liquid circulation device is used to control the flow and temperature of liquid, for example, including pump body, pipeline and liquid storage container, pump body drives liquid circulation, ensures uniform distribution of heat exchange medium, liquid circulation device can be realized by mechanical pump or electromagnetic pump, for example, mechanical pump uses motor to drive impeller to generate liquid pressure difference, electromagnetic pump drives conductive fluid to move by magnetic field force.

[0063] Thermostatic regulator is connected with liquid circulation device, used to maintain constant temperature of liquid, in one implementation, thermostatic regulator includes temperature sensor and feedback control unit, temperature sensor monitors liquid temperature in real time, feedback control unit adjusts heating or cooling power according to set value.

[0064] In another implementation, the thermostatic regulator is water tank or temperature control tank, the liquid circulation device controls the temperature of the liquid through the water tank, the water tank raises the water temperature through the resistance heating element, and the temperature control tank integrates the semiconductor refrigeration sheet to realize bidirectional temperature regulation.

[0065] The water tank contains circulating liquid, and the water tank is provided with a heating element and a temperature probe, the heating element converts electric energy into heat energy, and the temperature probe feeds back real-time water temperature data, the water tank structure includes a liquid inlet, a liquid outlet and a heat preservation layer, which ensures efficient heat transfer to the liquid medium.

[0066] The liquid circulation device controls the temperature of the liquid through the water tank, drives the liquid to circulate between the water tank and the heat exchange plate, the pump body generates liquid pressure difference to drive the medium to move, and the liquid absorbs heat when flowing through the water tank to form a constant temperature heat carrier.

[0067] For the temperature of the liquid, for example, 80℃, 70℃, 90℃, can be adjusted according to the situation, which can provide sufficient heat driving force in the typical use temperature range of vacuum glass.

[0068] Deionized water is injected into the water tank, the liquid circulation device is started, the target temperature of the thermostatic regulator is set to 80℃, the heating element starts to work, the temperature probe collects water temperature data every fixed interval, when the detected temperature is lower than 80℃, the heating power is increased, when it is higher than 80℃, the heat dissipation mechanism is started, and the stable constant temperature liquid is input into the heat exchange plate through the pipeline.

[0069] The heat exchange plate is connected with the liquid circulation device through the pipeline, used to transfer the heat in the liquid to the vacuum glass to be tested. The heat exchange plate includes a heat-conducting metal plate and an internal flow channel, the heat-conducting metal plate is made of copper or aluminum alloy, and the internal flow channel allows the liquid to flow through to evenly dissipate heat, for example, the surface of the copper plate is plated with nickel to enhance corrosion resistance, and the aluminum alloy plate is formed by extrusion process to reduce thermal resistance.

[0070] After starting the liquid circulation device, the pump body drives the liquid to flow through the thermostat, which heats the liquid to the set temperature and maintains it constant, and then the liquid is delivered to the heat exchange plate through the pipeline, the heat exchange plate contacts the surface of the vacuum glass, and the heat is output in the form of heat flow, the liquid continues to circulate in the closed loop, and the heat flow signal penetrating the glass is detected by the heat flow sensing assembly 200.

[0071] The closed-loop liquid circulation system isolates the environmental air flow disturbance, the thermostat offsets the external temperature change through feedback control, the metal heat conduction structure of the heat exchange plate efficiently transfers heat, avoids the position error when the thermocouple directly measures the temperature, and the heat source output only reflects the set parameters without introducing additional noise.

[0072] In some embodiments, the heat flow sensing assembly 200 includes a signal receiving plate, a heat flow sensor, and a shielding shell; the heat flow sensor is arranged inside the signal receiving plate; the shielding shell covers the signal receiving plate; based on the signal receiving plate and the heat flow sensor, a heat flow signal penetrating the vacuum glass to be detected is generated.

[0073] The heat flow sensor is arranged inside the signal receiving plate and converts the temperature gradient into an electrical signal based on the thermocouple or thermal resistance principle, the heat flow sensor and the signal receiving plate are combined through a heat-conducting adhesive layer to form a lossless heat conduction path from the glass surface to the sensing unit.

[0074] In some embodiments, the shielding shell can be made of electromagnetic shielding materials such as galvanized steel or permalloy, which blocks external electromagnetic fields and air flow interference through a fully enclosed design, and the shielding shell and the signal receiving plate are filled with thermal insulation materials to block environmental heat exchange.

[0075] After the heat source is started, the heat flow transmitted by the glass is introduced into the heat flow sensor through the signal receiving plate, the shielding shell remains in a closed state, the internal thermal insulation layer maintains temperature stability, the heat flow sensor outputs an analog voltage signal to a subsequent processing unit, and the rigid combination of the heat flow sensor and the signal receiving plate ensures the uniqueness of the heat conduction path, and the output signal is only related to the thermal resistance characteristics of the glass.

[0076] In some embodiments, the signal conversion assembly 300 includes a signal amplifier, an analog-to-digital converter, and a parameter processor; the signal amplifier is connected to the heat flow sensing assembly 200 and outputs amplified sensing data; the analog-to-digital converter converts the amplified sensing data into a digital signal; and the parameter processor generates an electrical signal parameter representing the detection result according to the digital signal.

[0077] The signal amplifier is a circuit module for enhancing the strength of the sensing signal, receives the original analog signal output by the heat flow sensing assembly 200, and enhances the signal amplitude through an adjustable gain circuit. The signal amplifier includes a differential input stage and a filter network. The differential input suppresses common-mode interference, and the filter network eliminates high-frequency noise. For example, an instrumentation amplifier structure or an operational amplifier combination circuit can achieve this function.

[0078] The analog-to-digital converter converts the amplified analog sensing data into a digital signal. The architecture can be a successive approximation type or a double integration type. The analog-to-digital converter acquires the instantaneous value of the analog signal through a sample-and-hold circuit, and then outputs binary data through quantization and encoding. The conversion accuracy needs to meet the dynamic range requirements of the heat flow signal.

[0079] The parameter processor generates an electrical signal parameter representing the detection result based on the digital signal. The parameter processor can be a microcontroller or a programmable logic device. The parameter processor runs a preset algorithm to calculate the effective value of the voltage and maps the result to an insulation performance indicator. The output interface supports digital display or data communication protocol transmission.

[0080] The weak analog signal of the heat flow sensing assembly 200 is conditioned by the signal amplifier and quantized into a digital signal by the analog-to-digital converter. The parameter processor processes the digital signal through an algorithm to generate an electrical signal parameter (such as a voltage value) that can be directly interpreted. The parameter is inversely proportional to the vacuum glass insulation performance.

[0081] For example, a vacuum glass sample is placed on the detection platform, and the heat flow sensor outputs a 0.5 mV original signal. The signal amplifier is set to a gain of 10 times, and outputs a 5 mV amplified signal. The analog-to-digital converter quantizes the signal at a sampling rate of thousands per second, and outputs 2500 digital sequences after five seconds. The parameter processor calculates the average value after removing 10% of the extreme values, generates a 3.49 mV electrical signal parameter, and displays it on the screen.

[0082] Traditional distributed thermocouple temperature measurement requires multiple point calibration and the signal is prone to attenuation. The voltage value directly read includes line loss error. This application eliminates transmission loss and random noise through step-by-step processing of the signal link, so that the final parameter accurately reflects the thermal characteristics of the glass body.

[0083] To fix the vacuum glass to be tested and adjust its position to ensure that the output path of the heat source penetrates the surface of the glass vertically. The detection device further comprises a structure adaptation assembly, which comprises a fixed base, a height adjustment mechanism, and a sample bearing table. The height adjustment mechanism is arranged on the fixed base. The sample bearing table is connected to the height adjustment mechanism and is used to position the vacuum glass to be tested. The height adjustment mechanism drives the sample bearing table to move to control the output path of the heat source to penetrate the surface of the vacuum glass to be tested vertically.

[0084] The fixed base can be made of metal material to ensure that the device does not shake or displace during operation. The fixed base is fixed on the workbench by bolts or buckles to provide rigid support.

[0085] The height adjustment mechanism is arranged on the fixed base and is used to drive the sample carrier to move vertically. The height adjustment mechanism can include mechanical transmission elements such as a lead screw or a hydraulic cylinder. The height of the sample carrier can be controlled by a manual knob or a motor. After receiving an operation instruction, the height adjustment mechanism adjusts the position of the sample carrier to keep the glass surface vertically aligned with the heat source.

[0086] The sample carrier is connected to the height adjustment mechanism and is used to directly carry and position the vacuum glass to be tested. The sample carrier includes a flat plate structure and a fixed clamp. The flat plate structure can be made of metal or hard plastic and has a smooth surface to fit the glass. The fixed clamp can be a spring clamp or a vacuum suction cup to ensure that the glass does not slip or tilt during testing. The sample carrier moves through the height adjustment mechanism and is locked at the desired height.

[0087] During operation, the fixed base is first installed on the workbench and is fastened by bolts to prevent shaking. The operator places the vacuum glass to be tested on the sample carrier and clamps the edge of the glass using the fixed clamp to prevent movement. Then, the height adjustment mechanism is adjusted to vertically raise and lower the sample carrier until the glass surface is parallel to the output surface of the heat source. After locking the height, the heat source starts to output heat. The path of the heat flow penetrates the glass surface vertically and enters the heat flow sensing assembly 200. The entire process requires that the glass surface be completely fitted to the output surface of the heat source to avoid heat flow scattering.

[0088] The operation principle of the structure adaptation assembly is based on a mechanical adjustment mechanism. The fixed base provides stable support, and the height adjustment mechanism drives the sample carrier to vertically raise and lower. The sample carrier positions the glass to ensure that the output path of the heat source penetrates the surface vertically, thereby eliminating the test angle deviation and ensuring the consistency of the heat flow transmission direction.

[0089] In some embodiments, the signal conversion assembly 300 includes a calibration database and a coefficient mapping module. The calibration database is used to store the preset mapping relationship between the electrical signal parameters and the thermal conductivity coefficient, including a historical test data set obtained through a standard test environment. The corresponding relationship between the electrical signal parameters and the thermal conductivity coefficient is established. The calibration database stores the mapping relationship in the form of a table or a function, supporting data query and calling.

[0090] The coefficient mapping module is used to call the preset mapping relationship to convert the electrical signal parameters into the quantitative thermal insulation performance test results. The coefficient mapping module receives the real-time detected electrical signal parameters, matches the corresponding thermal conductivity coefficient value through database retrieval, and realizes data matching through software algorithm, for example, using a lookup table method or an interpolation calculation method to determine the thermal conductivity coefficient result.

[0091] In the data construction phase, the benchmark thermal conductivity value is obtained by testing according to the national standard method, the electric signal parameter is detected by using the device, the parameter value and the thermal conductivity are stored in the calibration database, in the application stage, when the sample to be tested is tested, the electric signal parameter is obtained after the signal transfer component outputs the electric signal parameter, the coefficient mapping module obtains the real-time electric signal parameter, the corresponding thermal conductivity is matched by calling the calibration database, and the result is output.

[0092] The device provided in the application is based on the heat flow sensor principle, the thermal conductivity determines the heat transfer efficiency in the sensor, according to the Fourier law, the higher the thermal conductivity, the faster the heat flow transfer, the larger the temperature difference of the thermoelectric pile, and the stronger the output voltage signal, therefore, the voltage can be tested to reflect the good or bad of the thermal conductivity, that is, the voltage is proportional to the thermal conductivity and inversely proportional to the thermal insulation performance.

[0093] Based on the above-mentioned vacuum glass thermal insulation performance detection device, as shown in Figure 2 The application further provides a vacuum glass thermal insulation performance detection method, which comprises the following steps:

[0094] A temperature control component is used to apply a set temperature heat source to the vacuum glass to be tested;

[0095] A heat flow sensing component is used to receive a heat flow signal penetrating through the vacuum glass to be tested;

[0096] A signal conversion component is used to convert the heat flow signal into an electric signal parameter, and the electric signal parameter represents the detection result.

[0097] A temperature control component is used to apply a stable heat flow to the vacuum glass, the heat flow penetrating through the glass is acquired by a heat flow sensing component, the sensing signal is processed by a signal conversion component, and an electric signal parameter inversely proportional to the thermal insulation performance is output.

[0098] In some embodiments, the heat flow signal penetrating through the vacuum glass to be tested is received by the heat flow sensing component, which comprises the following steps:

[0099] A structure adaptation component is used to attach the first contact surface of the vacuum glass to be tested to the temperature control component, and attach the second contact surface of the vacuum glass to be tested to the heat flow sensing component;

[0100] The output path of the heat source is controlled to vertically penetrate the surface of the vacuum glass to be tested.

[0101] The first contact surface refers to the upper surface of the vacuum glass to be tested in contact with the temperature control component, which needs to completely cover the heat source output area to ensure that the heat flow is uniformly introduced into the glass interior. The flatness of the contact surface directly affects the heat conduction efficiency.

[0102] The second contact surface refers to the lower surface of the vacuum glass to be tested that is in contact with the heat flow sensing assembly. The surface needs to be closely attached to the sensing assembly to avoid air gap that causes heat signal attenuation. The cleanliness of the contact surface determines the completeness of the heat flow signal acquisition.

[0103] The vacuum glass to be tested is placed on the bearing platform of the structure adaptation assembly, the clamp fixes the edge of the glass, the height adjustment mechanism makes the first contact surface of the glass closely attached to the heat exchange plate of the temperature control assembly, at the same time, the second contact surface is pressed against the signal receiving plate of the heat flow sensing assembly, and the horizontal calibrator can also be used to verify that the heat source output path is perpendicular to the glass surface.

[0104] For example, an operator takes a 300mm by 300mm vacuum glass sample and places it on the bearing table, locks the four corners with spring clamps, adjusts the height by turning the hand wheel, and observes the level indicator until the glass surface is completely parallel to the heat exchange plate, and then applies light pressure to ensure that the two surfaces are closely attached without gaps. Start the 80-degree Celsius heat source, the heat flow penetrates the glass vertically into the heat flow sensing assembly, and the test lasts for 5 minutes.

[0105] After detection, the detection result is output through the preset mapping relationship between the electrical signal parameter and the thermal conductivity coefficient. In some embodiments, the conversion of the heat flow signal into an electrical signal parameter includes:

[0106] A calibration curve is pre-stored and stored in a calibration database, and the calibration curve is a preset mapping relationship between an electrical signal parameter and a thermal conductivity coefficient;

[0107] An electrical signal parameter is obtained;

[0108] The calibration curve is called based on the electrical signal parameter, and the thermal conductivity coefficient is obtained;

[0109] The thermal conductivity coefficient is output, and the thermal conductivity coefficient is the detection result of quantifying the thermal insulation performance.

[0110] The standard representation form of the thermal conductivity coefficient is the U value, which is in units of watts per square meter kelvin, directly quantifying the thermal insulation performance of vacuum glass. The U value mapping is used as the final output result for industrial evaluation and comparison. The calibration curve is generated by pre-storing test data, and the curve mapping is called in real-time detection to output the U value, realizing automatic conversion. Specifically, the mapping relationship between the U value and the electrical signal parameter value is stored in the calibration database to form the calibration curve. The calibration curve calling path standardizes the isolation environment variables, and the final U value output only depends on the pre-stored data and real-time signal, which truly reflects the glass thermal resistance characteristics.

[0111] For example, the operator selects three standard samples of the same size of vacuum glass in the pre-storage stage. The average value of the thermal conductivity is obtained by using the national standard method for testing in a constant temperature environment. The device is used synchronously, the heat source temperature is set and lasts for a period of time, the average value of the electrical signal parameter is detected, the mapping relationship between the thermal conductivity value and the electrical signal parameter value is stored in the calibration database, and the calibration curve is established.

[0112] In the application stage, when testing a new vacuum glass sample, the signal conversion component outputs real-time electrical signal parameters, the coefficient mapping module obtains the parameters, retrieves the calibration database, matches the closest mapping point through the table lookup method, derives the thermal conductivity value, and displays the value on the operation interface as the final test result.

[0113] In order to compare the test data of the detection device and method provided in the application, and at the same time ensure the effectiveness and wide recognition of the test results of the thermal insulation performance of vacuum glass, the thermal conductivity performance of the vacuum glass of embodiments 1, 2, 3, 4 and 5 is tested according to GB / T 34342-2017 "Building envelope thermal conductivity coefficient detection method", which is convenient for comparison with the test data of the patent.

[0114] Embodiment 1

[0115] The vacuum glass with a thickness of 4mm+0.5mm gap+4mm is tested, the heat source temperature is 80℃, and the data is read after 5min of testing.

[0116] Embodiment 2

[0117] The vacuum glass with a thickness of 4mm+0.5mm gap+4mm is tested, the heat source temperature is 50℃, and the data is read after 5min of testing.

[0118] Embodiment 3

[0119] The vacuum glass with a thickness of 4mm+0.5mm gap+4mm is tested, the heat source temperature is 90℃, and the data is read after 5min of testing.

[0120] Embodiment 4

[0121] The vacuum glass with a thickness of 4mm+0.5mm gap+4mm is tested, the heat source temperature is 80℃, and the data is read after 10min of testing.

[0122] Embodiment 5

[0123] The vacuum glass with a thickness of 4mm+0.5mm gap+4mm is tested, the heat source temperature is 80℃, and the data is read after 3min of testing.

[0124] In addition, the comparative example selects vacuum glass with the same size as the embodiment, and the thickness of the vacuum glass is 4mm+0.5mm gap+4mm. First, the U value of the glass is measured to be 0.5 W / (m 2·K), and then the voltage of 3.51 mV was measured by the device of the present application under the condition of the heat source temperature of 80℃ and the test time of 5 min. (Compared with the previous measurement of voltage and the measurement of U value, the voltage side can directly reflect the heat conduction performance in the later stage.) The corresponding relationship between the U value and the voltage was found, which was used as a reference.

[0125] The vacuum glass heat preservation test data of examples 1, 2, 3, 4 and 5 were compared with the test data under the national standard test method and the comparative example, and the results were as follows:

[0126]

[0127] From the above table, the U value of 0.5 W / (m 2 ·K) was first measured, and then the voltage of 3.51 mV was measured, which was the comparative example. It can be known that the corresponding relationship between the voltage and the U value was found. The test voltage of the vacuum glass was 3.49 mV, the test condition of the heat source temperature of 80℃ and the test time of 5 min was found, which was example 1. In order to compare with the comparative example, the U value of example 1 was measured by the national standard method, which was 0.52 W / (m 2 ·K). The results of the voltage and the U value matched with the comparative example, that is, the best matching relationship between the voltage and the U value was found (this step is equivalent to calibration, or it can be understood as finding the standard condition). It also shows that the detection device and the detection method provided by the present application are feasible, and it can be concluded that the test voltage value can quickly reflect the heat conduction performance.

[0128] By changing the temperature under the standard condition, examples 2 and 3 were compared with example 1. The U value of each vacuum glass was tested. The results of the U value were not much different, which showed that the national standard method for testing the U value had good stability. However, the change of the voltage data showed that the temperature change had a certain influence on the final voltage test, which could mislead the judgment of the later data. Therefore, when using the detection device and the detection method provided by the present application, the temperature of each test should be kept consistent with the temperature of the standard condition, in order to ensure the accuracy of the test data.

[0129] In addition, by comparing examples 1, 4 and 5, it can be concluded that the test time is one of the influencing factors of the heat conduction data judged by the voltage side in the present application.

[0130] In summary, the detection device and the detection method provided by the present application have good feasibility, which solves the shortcomings of long test time and harsh conditions when testing the U value of vacuum glass alone, and the test result has small fluctuation and good practical application value. In the environment that needs batch or frequent testing, the detection device and the detection method provided by the present application are most suitable. However, the best corresponding relationship between the heat conduction and the voltage should be found in advance through separate test, in order to obtain the best test condition and ensure the accuracy of the data.

[0131] It can be understood that the content of the method embodiment can be referred to the content of the above device embodiment, which will not be repeated here.

[0132] From the above technical solutions, the present application provides a kind of vacuum glass heat preservation performance detection device and detection method, the detection device includes temperature control component, heat flow sensing component and signal conversion component, wherein temperature control component is used to generate and maintain the heat source output of set temperature;Heat flow sensing component is set to the opposite side of the output path of heat source, for receiving the heat flow signal of penetrating the vacuum glass to be measured and generating sensing data;Signal conversion component is connected with the heat flow sensing component, for converting the sensing data into electrical signal parameter, the electrical signal parameter represents detection result.The device obtains the heat energy flow of penetrating glass directly through heat flow sensing component, avoids the direct influence of ambient temperature on temperature measuring element, to solve the problem of large fluctuation of test result.

[0133] The similar parts between the embodiments provided by the present application can be referred to each other, and the specific embodiments provided above are only several examples under the general concept of the present application, and do not limit the protection scope of the present application. For those skilled in the art, any other embodiments extended according to the present application scheme without creative labor are within the protection scope of the present application.

Claims

1. A device for detecting the thermal insulation performance of vacuum glass, characterized in that: include: a temperature control assembly for generating and maintaining a heat source output at a set temperature; a heat flow sensing component, disposed on the opposite side of the output path of the heat source, for receiving a heat flow signal penetrating the vacuum glass to be tested and generating sensing data; The signal conversion component is connected to the heat flow sensing component and is used to convert the sensing data into electrical signal parameters, and the electrical signal parameters represent the detection results.

2. The device for detecting the thermal insulation performance of vacuum glass according to claim 1, characterized in that: The temperature control assembly includes a liquid circulation device, a thermostat and a heat exchange plate; The liquid circulation device is connected to the thermostat to control the liquid temperature; The heat exchange plate is connected to the liquid circulation device through a pipeline; The liquid circulation device, thermostat and heat exchange plate generate and maintain the heat source output at a set temperature.

3. The device for detecting the thermal insulation performance of vacuum glass according to claim 2, characterized in that: The thermostat is a water tank, and the liquid circulation device controls the temperature of the liquid through the water tank, and the temperature of the liquid is a preset temperature.

4. The device for detecting the thermal insulation performance of vacuum glass according to claim 1, characterized in that: The heat flow sensing component includes a signal receiving board, a heat flow sensor and a shielding shell; The heat flow sensor is arranged inside the signal receiving board; the shielding shell covers the signal receiving board; Based on the signal receiving board and the heat flow sensor, a heat flow signal penetrating the vacuum glass to be tested is generated.

5. The device for detecting the thermal insulation performance of vacuum glass according to claim 1, characterized in that: The signal conversion component includes a signal amplifier, an analog-to-digital converter and a parameter processor; The signal amplifier is connected to the heat flow sensing component and outputs amplified sensing data; The analog-to-digital converter converts the amplified sensing data into a digital signal; The parameter processor generates electrical signal parameters representing the detection results based on the digital signal.

6. The device for detecting the thermal insulation performance of vacuum glass according to claim 1, characterized in that: Also includes: A structural adapter assembly, comprising a fixed base, a height adjustment mechanism, and a sample carrying platform; The height adjustment mechanism is arranged on the fixed base; The sample carrying platform is connected to the height adjustment mechanism and is used to position the vacuum glass to be tested; The height adjustment mechanism drives the sample carrying platform to move, so as to control the output path of the heat source to vertically penetrate the surface of the vacuum glass to be tested.

7. The device for detecting the thermal insulation performance of vacuum glass according to claim 1, characterized in that: The signal conversion component includes a calibration database and a coefficient mapping module; The calibration database is used to store a preset mapping relationship between electrical signal parameters and thermal conductivity; The coefficient mapping module is used to call the preset mapping relationship to convert the electrical signal parameters into detection results of quantitative thermal insulation performance.

8. A method for testing the thermal insulation performance of vacuum glass, characterized in that: The device for detecting the thermal insulation performance of vacuum glass according to any one of claims 1 to 7 comprises: Apply a heat source of set temperature to the vacuum glass to be tested through the temperature control component; receiving a heat flow signal penetrating the vacuum glass to be tested through a heat flow sensing component; The heat flow signal is converted into electrical signal parameters through a signal conversion component, and the electrical signal parameters represent the detection results.

9. The method for detecting the thermal insulation performance of vacuum glass according to claim 8, characterized in that: The heat flow sensing component receives the heat flow signal penetrating the vacuum glass to be tested, including: By means of a structural adapter component, the first contact surface of the vacuum glass to be tested is bonded to the temperature control component, and the second contact surface of the vacuum glass to be tested is bonded to the heat flow sensing component; The output path of the heat source is controlled to vertically penetrate the surface of the vacuum glass to be tested.

10. The method for detecting the thermal insulation performance of vacuum glass according to claim 8, characterized in that: The step of converting the heat flow signal into an electrical signal parameter comprises: Pre-storing a calibration curve, and storing the calibration curve in a calibration database, wherein the calibration curve is a preset mapping relationship between electrical signal parameters and thermal conductivity; Obtaining electrical signal parameters; calling the calibration curve based on the electrical signal parameters to obtain the thermal conductivity; The thermal conductivity is output, where the thermal conductivity is a test result that quantifies the thermal insulation performance.

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