A non-contact temperature measurement device

Abstract

The utility model relates to a kind of non-contact temperature measuring device, comprising: shell;Surface perception layer is installed in the top surface of heat conduction plate;Heat preservation insulating layer is arranged in the inner wall of shell;Heat conduction plate is connected with the inner wall of shell, heat conduction plate is located above net rack, heat conduction plate is contacted with energy storage layer;Net rack is located in the shell inside, and embedded energy storage layer;Energy storage layer is set in shell;Data acquisition and transmission equipment is set in the outer side wall of shell;Wherein, heat conduction plate and net rack are all equipped with temperature sensor, and all temperature sensor is connected to data acquisition and transmission equipment.The non-contact temperature measuring device of the utility model can receive, conduct and store external heat to the inside without destroying the structure to be measured, simulate the actual heating condition of the structure to be measured by built-in temperature sensor for detection, with high measurement accuracy, long-term monitoring can be used, belong to the structure internal temperature detection technical field.

Description

Technical Field

[0001] This utility model relates to the field of internal temperature detection technology, specifically to a non-contact temperature measurement device. Background Technology

[0002] Currently, effectively identifying the degree of damage to aging bridges and monitoring the health status of newly constructed bridges has become a major challenge. Bridge structures are exposed to the external natural environment and are affected by external climate factors, including solar radiation, wind speed, and humidity. This causes changes in the internal temperature of the bridge structure, and the thermal expansion and contraction of materials induces mechanical responses in the structure, such as changes in displacement, stress, strain, and support reactions. For temperature-sensitive structures like bridges and large-span spatial structures, the mechanical response caused by temperature loads can reach or even exceed the structural response caused by external operating loads, and is a major cause of structural damage, defects, and performance degradation.

[0003] In existing research and construction, there are three main methods for obtaining bridge temperature information: First, sending a large number of personnel to the site for testing can yield relatively accurate results; second, placing contact sensors on the bridge surface to directly measure various surface data and thereby infer any health problems existing inside the bridge; and third, non-contact temperature measurement, represented by thermal imaging technology. These instruments can be used to measure the surface temperature of moving objects, small targets, and objects with low heat capacity or rapid temperature changes, and can also be used to measure the temperature distribution of a temperature field.

[0004] However, existing measurement technologies and methods have some limitations: (1) For manual on-site measurement, the labor cost is extremely high, the time consumption is long, it is difficult to form long-term, continuous temperature monitoring, and the detection process will have a certain impact on the traffic on the bridge, which has a large limitation in actual engineering use; (2) For contact sensors, due to the complex environmental conditions of the bridge, the placement and use of temperature sensors are difficult in many cases, which limits the use of this method and makes it impractical; (3) Non-contact measurement methods represented by thermal imaging are greatly affected by the external environment. The shape of the component, the coating on the surface, and the temperature and wind speed of the air may all affect the final result, so it is difficult to provide accurate and reliable data. Utility Model Content

[0005] To address the technical problems existing in the prior art, the purpose of this utility model is to provide a non-contact temperature measurement device that can receive, conduct, and store external heat inside without damaging the structure under test. It simulates the actual heating condition of the structure under test and detects it through a built-in temperature detector, measuring the temperature field of the bridge under the combined action of various influencing factors. The measurement accuracy is high and it can be used for long-term monitoring.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A non-contact temperature measuring device, comprising: shell; A surface sensing layer is installed on the top surface of the heat-conducting plate; Thermal insulation layer, which is installed on the inner wall of the outer shell; The heat-conducting plate is connected to the inner wall of the outer shell. The heat-conducting plate is located above the grid frame and is in contact with the energy storage layer. The space frame is located inside the outer shell and is embedded in the energy storage layer; The energy storage layer is located inside the outer casing. Data acquisition and transmission equipment, which is installed on the outer wall of the housing; Temperature sensors are installed on both the heat-conducting plate and the mesh frame, and all temperature sensors are connected to the data acquisition and transmission equipment.

[0007] As a preferred embodiment, the outer shell is a hollow cubic structure with an opening on one side, which is flush with the surface of the surface sensing layer; the side wall cross-section of the outer shell is a hollow cross-section.

[0008] As a preferred option, the thermal insulation layer is attached to the inner wall of the outer shell.

[0009] As a preferred embodiment, the space frame includes aluminum alloy rod profiles and aluminum alloy mesh. There are four aluminum alloy rod profiles, which are arranged in a rectangular shape inside the shell. There are multiple aluminum alloy meshes, which are spaced apart along the axial direction of the aluminum alloy rod profiles. Both the aluminum alloy rod profiles and the aluminum alloy meshes are embedded in the energy storage layer. A temperature sensor is set in the middle of each aluminum alloy mesh.

[0010] As a preferred embodiment, a first sealing layer is provided between the surface sensing layer and the inner wall of the outer casing, and a second sealing layer is provided between the heat-conducting plate and the inner wall of the outer casing.

[0011] As a preferred embodiment, the connection surface between the heat-conducting plate and the surface sensing layer is provided with multiple grooves, and part of the surface sensing layer is embedded in the grooves.

[0012] As a preferred embodiment, the outer wall of the housing is provided with a protective box, which surrounds the outside of the data acquisition and transmission equipment.

[0013] As a preferred option, the data acquisition and transmission equipment is connected to a battery.

[0014] In summary, this utility model has the following advantages: 1. The non-contact temperature measuring device of this utility model adopts non-contact installation and use, and has the characteristics of being simple and easy to use, low cost and good repeatability. It can receive, conduct and store external heat into the interior without damaging the structure under test, simulate the actual heating situation of the structure under test, and measure the temperature field of the bridge under the combined action of various influencing factors through the built-in temperature detector. The measurement accuracy is high and it can be used for long-term monitoring.

[0015] 2. The non-contact temperature measuring device of this utility model is small in size, which avoids the problem of not being able to fit the bridge surface due to its excessive size in engineering. It is also easy to carry, which enhances its engineering practicality.

[0016] 3. The non-contact temperature measuring device in this utility model has controllable testing conditions and can realize the measurement of the internal temperature of bridges made of different materials under different environments.

[0017] 4. The non-contact temperature measuring device of this utility model can simulate two different thermal behavior processes of material heat absorption and heat release. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of a non-contact temperature measuring device. Figure 2 This is a schematic diagram of an explosion involving a non-contact temperature measuring device. Figure 3 This is a partial enlarged view of a non-contact temperature measuring device; The figure shows: 1-outer shell; 2-heat conduction plate; 3-first sealing layer; 4-surface sensing layer; 5-screw; 6-screw hole; 7-aluminum alloy mesh; 8-aluminum alloy rod profile; 9-temperature sensor; 10-thermal insulation layer; 11-integrated circuit board; 12-battery; 13-signal transmitter; 14-energy storage layer. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments.

[0020] Example 1 like Figures 1-3 As shown, this embodiment provides a non-contact temperature measuring device, comprising: The outer shell 1 is a hollow cubic structure with an opening on one side, flush with the surface sensing layer 4. The sidewalls of the outer shell 1 have a hollow cross-section. Specifically, the outer shell 1 is made of PLA and is a 3D-printed, one-piece open cuboid box. The preferred dimensions are 300mm long, 200mm wide, and 100mm high, with a thickness of 10mm after printing. This results in an outer shell 312mm long and 212mm wide, and an interior 300mm long and 200mm wide. The height can be adjusted according to the testing environment and the performance of the internal energy storage layer 14 material. Its advantage is high flexibility, allowing for dimensional changes based on actual engineering needs. A tongue-and-groove joint is used between the open side and the heat-conducting plate 2 and the surface sensing layer 4. The sidewalls have a hollow cross-section to enhance thermal insulation. Screw holes 6 are pre-drilled around the top of the outer shell 1 for screws 5 to install and secure the aluminum alloy plate (heat-conducting plate 2) and the surface sensing layer 4.

[0021] Surface sensing layer 4 is installed on the top surface of heat-conducting plate 2. Surface sensing layer 4 uses the same material and surface characteristics as the measured structure surface. The thickness of surface sensing layer 4 is selected according to the material characteristics; for homogeneous materials such as metal, the thickness can be 3-5 mm, while for heterogeneous materials such as concrete mortar and asphalt, the thickness can be 10-20 mm. Surface sensing layer 4 is tightly and firmly connected to the lower metal plate. Its dimensions are 292 mm × 192 mm, and its thickness should be as thin as possible while covering the entire plate.

[0022] A first sealing layer 3 is provided between the surface sensing layer 4 and the inner wall of the outer shell 1, and a second sealing layer is provided between the heat-conducting plate 2 and the inner wall of the outer shell 1. Both the first sealing layer 3 and the second sealing layer are sealed with thermal insulation foam material (glass glue).

[0023] Thermal insulation layer 10 is disposed on the inner wall of outer shell 1; thermal insulation layer 10 is disposed on the inner wall of outer shell 1 by means of adhesive. Thermal insulation layer 10 is made of fine diameter aerogel particles, which are bonded in multiple layers with adhesive to form a 3-5mm thermal insulation layer.

[0024] The heat-conducting plate 2 is connected to the inner wall of the outer shell 1 and is located above the grid frame. It contacts the energy storage layer 14. The connection surface between the heat-conducting plate 2 and the surface sensing layer 4 has multiple grooves, with a portion of the surface sensing layer 4 embedded within these grooves. These grooves are angled, 5mm wide and 3mm deep, their length and width matching the 3D-printed outer shell 1. The thickness of the surface sensing layer 4 is selected based on the characteristics of the bridge surface material. The angled grooves enhance the embedding effect with the surface sensing layer 4. The lower surface of the heat-conducting plate 2 is in full, seamless contact with the n-octadecane phase change thermal storage material. The heat-conducting plate 2 is made of aluminum alloy, which is connected to the outer shell 1 via screws and pre-drilled screw holes 6.

[0025] A space frame is located inside the outer shell 1 and embedded in the energy storage layer 14. The space frame includes four aluminum alloy rod profiles 8 and aluminum alloy mesh 7 cells. The four aluminum alloy rod profiles 8 are arranged in a rectangular pattern inside the outer shell 1. Multiple aluminum alloy mesh 7 cells are spaced apart along the axial direction of the aluminum alloy rod profiles 8, with a spacing of 200mm between adjacent mesh 7 cells. Both the aluminum alloy rod profiles 8 and the aluminum alloy mesh 7 cells are embedded in the energy storage layer 14. A temperature sensor 9 is placed in the center of each aluminum alloy mesh 7 cell. Embedding the space frame in the energy storage layer 14 increases the heat conduction efficiency within the energy storage layer 14. The aluminum alloy mesh 7 cells are quadrilaterals with dimensions of 10mm × 5mm and a grid line diameter of 0.8mm; the metal rod cross-section dimensions are 9mm × 6mm, and the edge thickness is 1.5mm.

[0026] Energy storage layer 14 is disposed inside the outer shell 1; energy storage layer 14 adopts a phase change energy storage material, paraffin-n-octadecane, which has the characteristics of high heat capacity and low phase change point. This material has good energy storage performance, and the thickness is selected according to the actual temperature. The bottom n-octadecane is required not to undergo complete phase change under extreme conditions, and it needs to have sufficient capacity to store internal energy.

[0027] Data acquisition and transmission equipment is installed on the outer wall of the housing 1; Temperature sensors 9 are installed on both the heat-conducting plate 2 and the mesh frame, and all temperature sensors 9 are connected to data acquisition and transmission equipment. The temperature sensors 9 are miniature high-precision T-type thermocouples.

[0028] The outer wall of the outer casing 1 is equipped with a protective box, which surrounds the data acquisition and transmission equipment. The protective box can be made of stainless steel, and its metal surface is sealed, waterproofed, and heat-insulated to meet the requirements of long-term operation in the structural service environment.

[0029] The data acquisition and transmission equipment is connected to a battery.

[0030] The data acquisition and transmission equipment is an existing product that can acquire temperature data detected by temperature sensor 9 and transmit it to a processor, mobile terminal or cloud. It mainly includes a circuit board 11 to realize the signal acquisition, conversion and storage of thermocouple temperature sensor 9; a signal transmitter 13 to realize the transmission of sensor digital signals in a wireless manner; and a battery 12 to power the electronic equipment. Considering the long-term monitoring situation, it can be composed of an external solar panel power supply.

[0031] The non-contact temperature measurement device in this embodiment allows the main structure to acquire external heat through the surface sensing layer 4 and then conduct it to the energy storage layer 14 through the grid for temperature storage and detection. On the other hand, the external data acquisition and transmission device can receive the temperature signal inside the main structure through the wire, process it through the circuit and transmit it as a wireless signal for reception and analysis by the mobile terminal.

[0032] Example 2 This embodiment provides a method for preparing a non-contact temperature measuring device. The method includes the following steps: S1: Print the outer shell 1 using 3D printing technology; S2: A thermal insulation layer 10 is provided on the inner wall of the outer shell 1; S3: Assemble the space frame, install the temperature sensor 9 on the space frame, install the space frame with the temperature sensor 9 installed into the outer shell 1, and set the energy storage layer 14 inside the outer shell 1; S4: Prepare a surface sensing layer on the heat-conducting plate 2, install the heat-conducting plate 2 inside the outer shell 1, and make the heat-conducting plate 2 contact the energy storage layer 14. S5: Connects temperature sensor 9 and data acquisition and transmission equipment.

[0033] In step S1, the bottom of the outer shell 1 is reserved with support holes for installing the mesh frame, and the side wall of the outer shell 1 is reserved with screw holes 6 for installing the heat conduction plate 2; the top of the outer shell 1 is provided with an opening. In step S2, the thermal insulation layer 10 is made of aerogel coating, which is formed by mixing aerogel and nano-silica aerogel. In step S3, the aluminum alloy rod profile 8 of the grid frame is fixed to the bottom of the shell and extends towards the opening of the outer shell 1; multiple aluminum alloy mesh 7 grids of the grid frame are fixed on the aluminum alloy rod profile 8 and are spaced apart along the axial direction of the aluminum alloy rod profile 8; a temperature sensor 9 is set in the middle of each aluminum alloy mesh 7 grid and the wiring is arranged; the assembled grid frame is placed in the reserved hole at the bottom of the outer shell 1, and the wires of the temperature sensor 9 are arranged and pass through the reserved hole on the side wall of the outer shell 1; the energy storage layer 14 is poured into the preset position of the outer shell 1; for example, the number of aluminum alloy mesh 7 grids is 4, and the spacing between the four aluminum alloy mesh 7 grids is 200mm.

[0034] The energy storage layer 14 is made of n-octadecane. The n-octadecane is poured and the sensing layer is assembled. The n-octadecane is heated to melt, and then slowly poured into the outer shell 1 through an open end to the preset graduation line. During pouring, the mold can be slightly vibrated to ensure a more uniform pour. To ensure the n-octadecane has the best possible contact with the heat-conducting plate 2, the surface sensing layer 4 should be placed in before the n-octadecane has completely solidified. The surface sensing layer 4 and the outer shell 1 are connected by screws 5 through the screw holes 6 pre-drilled on the surface sensing layer 4 and the outer shell 1. After the n-octadecane has solidified, the surrounding pores (the pores between the surface sensing layer 4 and the outer shell 1) are sealed with silicone sealant.

[0035] In step S4, the heat-conducting plate 2 is an aluminum alloy plate. A slanted groove is provided on the top surface of the aluminum alloy plate, allowing part of the surface sensing layer 4 to contact the top surface of the aluminum alloy plate, with part of the surface sensing layer 4 embedded in the slanted groove. The surface sensing layer 4 is formed by casting a material consistent with the material to be tested, leaving a circumferential gap during casting, and sealing it with silicone sealant after installation. Specifically, the heat-conducting plate 2 is an 8mm thick aluminum alloy plate with a 5mm wide and 3mm deep slanted groove. Depending on the actual working conditions, a surface sensing layer 4 conforming to the road surface material is cast onto it, leaving a circumferential gap during casting, and sealing it with silicone sealant after installation.

[0036] In step S5, the wires of the temperature sensor 9 are connected to the data acquisition and transmission equipment to complete the preparation.

[0037] After the non-contact temperature measurement device is prepared, it is installed at different positions and in different directions on the bridge deck, with the surface sensing layer 4 (aluminum alloy plate) facing outwards, responsible for receiving various external influencing factors. Then, the internal temperature data is transmitted through the thermocouple temperature sensor 9 and compared with the temperature data obtained from the external air temperature sensor. The temperature of the bridge is obtained through internal temperature analysis and conversion.

[0038] Specifically, the thermal insulation layer 10 uses an aerogel coating made of a high-performance thermal insulation material, aerogel-nano silica aerogel, which can effectively prevent heat loss and thus prevent distortion of the measured data. The aluminum alloy mesh 7 has good thermal conductivity and is lightweight.

[0039] The parts not mentioned in this embodiment are the same as in Embodiment 1.

[0040] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A non-contact temperature measuring device, characterized in that, include: shell; A surface sensing layer is installed on the top surface of the heat-conducting plate; Thermal insulation layer, which is installed on the inner wall of the outer shell; The heat-conducting plate is connected to the inner wall of the outer shell. The heat-conducting plate is located above the grid frame and is in contact with the energy storage layer. The space frame is located inside the outer shell and is embedded in the energy storage layer; The energy storage layer is located inside the outer casing. Data acquisition and transmission equipment, which is installed on the outer wall of the housing; Temperature sensors are installed on both the heat-conducting plate and the mesh frame, and all temperature sensors are connected to the data acquisition and transmission equipment.

2. A non-contact temperature measuring device according to claim 1, characterized in that: The outer shell is a hollow cubic structure with an opening on one side, which is flush with the surface of the surface sensing layer; the side wall cross-section of the outer shell is a hollow cross-section.

3. A non-contact temperature measuring device according to claim 1, characterized in that: The thermal insulation layer is attached to the inner wall of the outer shell.

4. A non-contact temperature measuring device according to claim 1, characterized in that: The space frame consists of four aluminum alloy rods and aluminum alloy meshes. The four aluminum alloy rods are arranged in a rectangular shape inside the shell. There are multiple aluminum alloy meshes, which are spaced apart along the axial direction of the aluminum alloy rods. Both the aluminum alloy rods and the aluminum alloy meshes are embedded in the energy storage layer. A temperature sensor is placed in the middle of each aluminum alloy mesh.

5. A non-contact temperature measuring device according to claim 1, characterized in that: A first sealing layer is provided between the surface sensing layer and the inner wall of the outer shell, and a second sealing layer is provided between the heat-conducting plate and the inner wall of the outer shell.

6. A non-contact temperature measuring device according to claim 1, characterized in that: The connection surface between the heat-conducting plate and the surface sensing layer has multiple grooves, and part of the surface sensing layer is embedded in the grooves.

7. A non-contact temperature measuring device according to claim 1, characterized in that: The outer wall of the casing is equipped with a protective box, which surrounds the outside of the data acquisition and transmission equipment.

8. A non-contact temperature measuring device according to claim 1, characterized in that: The data acquisition and transmission equipment is connected to a battery.

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