Multi-gear adjustable hemispherical cover type electronic temperature test instrument

Abstract

The utility model discloses a kind of multi-gear adjustable hemispherical cover type electronic temperature test instrument, including hand pole, the upper end of the hand pole is fixedly connected shell, shell is equipped with hemispherical heating cover, the inner wall of the hemispherical heating cover is fixedly connected with two ceramic skeletons symmetrically, the outer wall of two ceramic skeletons is spirally wound with heating wire, the heating wire is nickel-chromium alloy wire, the inner bottom of the hemispherical heating cover is equipped with thermocouple, the outer wall of the hand pole is fixedly connected with control assembly. The utility model can realize accurate temperature control, multi-gear adjustment and have safety protection function, to meet the actual demand of fire detection work.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensing tester technology, and in particular to a multi-level adjustable hemispherical electronic temperature sensing tester. Background Technology

[0002] In the field of fire protection facility inspection and maintenance, heat detectors are key equipment for fire early warning, and their response sensitivity and reliability are directly related to fire safety assurance capabilities. To ensure that heat detectors can accurately trigger alarms in actual fire situations, their performance indicators, such as response threshold and temperature sensing accuracy, need to be tested regularly using professional testing instruments. Therefore, heat detector testing instruments have become an indispensable tool in fire protection inspection work.

[0003] Currently, traditional temperature detector testers generally adopt a planar heating head design, which has many technical shortcomings in practical applications and cannot meet the needs of accurate and diversified testing. These shortcomings are mainly reflected in the following aspects: Large temperature measurement error: The planar heating head of the traditional tester cannot achieve a tight fit with the curved shape of the temperature sensor being tested, resulting in a gap between the two, which greatly reduces the heat conduction efficiency.

[0004] Limited range: Most existing testers only support output at a fixed temperature point, while temperature detectors in actual applications have multiple response thresholds depending on the usage scenario. Traditional testers cannot adapt to the testing needs of detectors with different response thresholds, which limits their applicability and causes inconvenience to the testing work.

[0005] There is a risk of overheating: During continuous operation, traditional testing instruments lack effective heat insulation and heat dissipation design, allowing heat to easily transfer to the outer casing, causing the casing temperature to exceed 70°C. This not only affects the lifespan and stability of the testing instrument itself, but more importantly, it poses a serious safety hazard, greatly increasing the risk of burns to operators who handle the instrument.

[0006] Therefore, it is necessary to design a multi-level adjustable hemispherical electronic temperature sensing tester to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-level adjustable hemispherical electronic temperature sensor. This invention enables precise temperature control, multi-level adjustment, and safety protection functions, thereby meeting the actual needs of fire protection testing.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A multi-level adjustable hemispherical electronic temperature sensor includes a handheld rod, the upper end of which is fixedly connected to a housing. A hemispherical heating cover is provided inside the housing. Two ceramic frames are symmetrically fixedly connected to the inner wall of the hemispherical heating cover. Heating wires, which are nickel-chromium alloy wires, are spirally wound on the outer walls of the two ceramic frames. A thermocouple is installed at the inner bottom of the hemispherical heating cover. A control component is fixedly connected to the outer wall of the handheld rod.

[0009] Preferably, the control component includes a control board, on which a microcontroller of model STM32F030 is mounted, and a gear switch of three-position mechanical knob is mounted on the front side of the control board.

[0010] Preferably, a ceramic heat insulation ring is fixedly connected to the outer wall of the hemispherical heating cover, and multiple heat dissipation fins are fixedly connected to the outer wall of the hemispherical heating cover, with the heat dissipation fins extending through the shell to the outside.

[0011] Preferably, the hemispherical heating cover is made of aviation aluminum, the radius of curvature of the hemispherical heating cover is 20mm±0.1mm, the wall thickness of the hemispherical heating cover is 1.5mm, and the inner wall of the hemispherical heating cover is provided with an anodized black coating.

[0012] Preferably, the ceramic skeleton is a hollow cylinder, the ceramic skeleton is made of 96% alumina ceramic, the outer surface of the ceramic skeleton is provided with a spiral groove with a depth of 0.3mm, and the heating wire is installed in the spiral groove.

[0013] Preferably, the ceramic heat insulation ring is made of microporous zirconia ceramic, the outer diameter of the ceramic heat insulation ring is 30mm, the inner diameter is 22mm, and the thickness is 3mm. The heat dissipation fins are made of aluminum alloy and consist of 12 radial fins with a thickness of 1.2mm, with a spacing of 2.5mm between every two adjacent radial fins.

[0014] Compared with existing technologies, the advantages of this device are: Compared with existing technologies, the use of a hemispherical heating cover can fit closely to the surface detector being tested. Combined with the anodized black treatment on the inner surface and the non-uniformly arranged heating wires, the heat conduction efficiency is improved by 40%, and the temperature control error is ≤±1℃, which can more accurately reflect the true response performance of the detector. Compared with existing technologies, the three-position mechanical knob switch, combined with the STM32F030 microcontroller control board with three preset PID parameters, can be used to test detectors with different response thresholds. It is compatible with the testing needs of temperature detectors in various scenarios such as catering kitchens, general scenes, and industrial sites, and has a wider range of applications. Compared with existing technologies, the use of a ceramic heat insulation ring to isolate the heating cover, combined with heat dissipation fins, ensures that the shell temperature is below 45°C during continuous operation, effectively preventing burns to operators and solving the overheating risk of traditional equipment shells exceeding 70°C. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a multi-level adjustable hemispherical electronic temperature sensing tester proposed in this utility model. Figure 2 for Figure 1 An internal diagram.

[0016] In the diagram: 1. Hemispherical heating cover, 2. Heating wire, 3. Ceramic frame, 4. Thermocouple, 5. Gear switch, 6. Control board, 7. Ceramic heat insulation ring, 8. Heat dissipation fins, 9. Hand handle, 10. Housing. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Reference Figures 1-2 A multi-level adjustable hemispherical electronic temperature sensor includes a handheld lever 9, the upper end of which is fixedly connected to a housing 10. A hemispherical heating cover 1 is housed inside the housing 10. The hemispherical heating cover 1 is made of aerospace-grade aluminum with a thermal conductivity of 180 W / m·K. The radius of curvature of the hemispherical heating cover 1 is 20 mm ± 0.1 mm, matching the surface of a standard detector. The wall thickness of the hemispherical heating cover 1 is 1.5 mm. The inner wall of the hemispherical heating cover 1 is coated with an anodized black coating with an emissivity > 0.9. Two ceramic frames 3 are symmetrically fixedly connected to the inner wall of the hemispherical heating cover 1. Heating wires 2 are spirally wound around the outer walls of both ceramic frames 3. The ceramic skeleton 3 is a hollow cylinder with an outer diameter of 18mm and an inner diameter of 10mm. The ceramic skeleton 3 is made of 96% alumina ceramic. The outer surface of the ceramic skeleton 3 has a spiral groove with a depth of 0.3mm. The heating wire 2 is installed in the spiral groove. The heating wire 2 is a nickel-chromium alloy wire, which is non-uniformly arranged with a top wire spacing of 1mm and an edge wire spacing of 2mm to optimize the uniformity of the heat field. Its resistance is 8Ω±5%. A thermocouple 4 is installed at the inner bottom of the hemispherical heating cover 1. The thermocouple 4 is a K-type thermocouple. The solder joint is located at the geometric center of the hemispherical cover. The thermocouple 4 is covered with a double layer of magnesium oxide insulation + stainless steel sheath. The control components are fixedly connected to the outer wall of the handheld rod 9.

[0019] The control components include a control board 6, which is equipped with a microcontroller, model STM32F030, with three preset PID parameters. It can compare the temperature feedback from thermocouple 4 with the target value in real time and adjust the heating power through PWM. The front of the control board 6 is equipped with a gear switch 5, which is a three-position mechanical knob with temperature settings of 57℃, 68℃ and 93℃. It uses copper alloy contacts and is equipped with a positioning bead spring. When the internal temperature of the hemispherical heating cover 1 exceeds the target value by 10℃, the control board will automatically cut off the power.

[0020] The outer wall of the hemispherical heating cover 1 is fixedly connected with a ceramic heat insulation ring 7 to isolate the hemispherical heating cover 1 from the shell 10. The ceramic heat insulation ring 7 is fixedly connected to the shell 10. The outer wall of the hemispherical heating cover 1 is fixedly connected with multiple heat dissipation fins 8. The heat dissipation fins 8 penetrate the shell 10 and extend to the outside. The ceramic heat insulation ring 7 is made of microporous zirconia ceramic. The outer diameter of the ceramic heat insulation ring 7 is 30mm, the inner diameter is 22mm, and the thickness is 3mm. It is used to isolate the heating cover. The heat dissipation fins 8 are made of aluminum alloy. The heat dissipation fins 8 are 12 radial fins with a thickness of 1.2mm. The spacing between each two adjacent radial fins is 2.5mm. The upper end of the hemispherical heating cover 1 is provided with a silicone sealing ring.

[0021] It is worth mentioning that the heating wire 2 in this application can be replaced by a PTC ceramic heating element or an infrared LED array heating element. The PTC ceramic heating element heats up slowly but has a long service life. The infrared LED array heating element is non-contact heating but has lower precision. A Bluetooth module can also be added to connect the device to the APP via Bluetooth, so that the temperature can be adjusted from 50 to 100°C through the APP.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-level adjustable hemispherical electronic temperature sensor, comprising a handheld lever (9), characterized in that: The upper end of the handheld rod (9) is fixedly connected to the housing (10). The housing (10) is provided with a hemispherical heating cover (1). Two ceramic skeletons (3) are symmetrically fixedly connected to the inner wall of the hemispherical heating cover (1). Heating wires (2) are spirally wound on the outer walls of the two ceramic skeletons (3). The heating wires (2) are nickel-chromium alloy wires. A thermocouple (4) is installed at the bottom of the inner wall of the hemispherical heating cover (1). A control component is fixedly connected to the outer wall of the handheld rod (9).

2. The multi-level adjustable hemispherical electronic temperature sensor according to claim 1, characterized in that: The control component includes a control board (6), on which a microcontroller is provided. The microcontroller is an STM32F030. A gear switch (5) is provided on the front side of the control board (6). The gear switch (5) is a three-position mechanical knob.

3. The multi-level adjustable hemispherical electronic temperature sensor according to claim 1, characterized in that: A ceramic heat insulation ring (7) is fixedly connected to the outer wall of the hemispherical heating cover (1), and a plurality of heat dissipation fins (8) are fixedly connected to the outer wall of the hemispherical heating cover (1). The heat dissipation fins (8) extend through the shell (10) to the outside.

4. The multi-level adjustable hemispherical electronic temperature sensor according to claim 1, characterized in that: The hemispherical heating cover (1) is made of aviation aluminum. The radius of curvature of the hemispherical heating cover (1) is 20mm ± 0.1mm. The wall thickness of the hemispherical heating cover (1) is 1.5mm. The inner wall of the hemispherical heating cover (1) is provided with an anodized black coating.

5. The multi-level adjustable hemispherical electronic temperature sensor according to claim 1, characterized in that: The ceramic skeleton (3) is a hollow cylinder made of 96% alumina ceramic. The outer surface of the ceramic skeleton (3) is provided with a spiral groove with a depth of 0.3 mm, and the heating wire (2) is installed in the spiral groove.

6. The multi-level adjustable hemispherical electronic temperature sensor according to claim 3, characterized in that: The ceramic heat insulation ring (7) is made of microporous zirconia ceramic. The outer diameter of the ceramic heat insulation ring (7) is 30mm, the inner diameter is 22mm, and the thickness is 3mm. The heat dissipation fins (8) are made of aluminum alloy. The heat dissipation fins (8) are 12 radial fins with a thickness of 1.2mm, and the distance between each pair of adjacent radial fins is 2.5mm.

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