A moisture meter integrated with an infrared heating module

Abstract

The utility model discloses a kind of moisture determinators integrated infrared heating module, relate to moisture analysis instrument technical field.The uneven heating distribution of existing halogen lamp or oven moisture meter, water vapor is easy to condense in cavity and pollute sensor, and equipment is heavy and relies on external power supply.The utility model integrates sample heating group, symmetrically arranged infrared heating module, U-shaped temperature detection channel and drying agent bottle group in base frame, one-way air path is established by air inlet and air outlet, temperature sensor signal is through temperature controller, power regulating device closed-loop regulation lamp power, is uniformly managed by main control PLC, battery module power supply, solve the uneven heating and condensation pollution problem.In structure, detection platform and control console are installed side by side;Control console top installs heating group and connects drying agent bottle group;Sensor and infrared lamp are equipped outside temperature detection channel;Power regulating device, temperature controller, PLC are placed control console and connect battery module, compact structure.

Description

Technical Field

[0001] This utility model relates to the field of moisture analysis instrument technology, specifically a moisture analyzer with an integrated infrared heating module. Background Technology

[0002] Existing moisture analyzers use halogen lamps or heating wires for heating, combined with weighing or conductivity detection methods to complete moisture analysis. They are widely used in grain, pharmaceutical, chemical raw material, and laboratory quality control scenarios. An existing portable outdoor moisture analyzer (publication number: CN207096240U) has the following drawbacks and requires further improvement.

[0003] Traditional equipment suffers from insufficient relative positioning accuracy between the heating source and the sample tray, resulting in uneven infrared radiation distribution and causing localized overheating or insufficient drying of the sample. The evaporated water vapor condenses inside the chamber, which can easily contaminate optical components and sensors, affecting repeatability and measurement accuracy.

[0004] Conventional instruments are mostly modular, with complex wiring between the infrared source, sensor, and controller, resulting in weak anti-interference capabilities. Temperature control response is lagging, and heating power is difficult to match the target temperature curve in real time, leading to long detection cycles and high energy consumption. The equipment is bulky, relies on external AC power, lacks portability, and is not conducive to rapid on-site detection and online monitoring. Utility Model Content

[0005] The main objective of this invention is to provide a moisture analyzer with an integrated infrared heating module, which can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a moisture analyzer integrating an infrared heating module, wherein a detection platform and a control platform are respectively provided on both sides above the base, a sample heating group is provided above the control platform, a desiccant bottle group is provided above the detection platform, an air inlet and an exhaust port are respectively provided on both sides above the sample heating group, at least two desiccant bottles are provided above the desiccant bottle group, temperature sensors are provided on both sides of the temperature detection channel, and infrared heating modules are also provided on both sides of the temperature detection channel and are correspondingly installed at one end of the temperature sensors, the infrared heating module is electrically connected to a power adjustment device, the power adjustment device is electrically connected to a temperature controller, the temperature controller is electrically connected to a main control PLC, and the power supply module is electrically connected to the main control PLC.

[0007] Preferably, the sample heating assembly is a vertically arranged cylindrical sealed cavity, with a detachable cap at the upper end of the cylinder. The cap is screwed onto the cylinder via an external thread of M50×2, and silicone rubber is provided between the mating surfaces. “O” ring seal.

[0008] Preferably, the air inlet and exhaust outlet are respectively located within an inner diameter of The high-temperature resistant silicone tubing is connected to the G1 / 8″ quick-connect fitting on the sample heating assembly cylinder cover.

[0009] Preferably, the temperature detection channel is a U-shaped 304 stainless steel tube with an inner diameter of [missing information]. Add at both ends of the pipe wall The passivated flange has an M8×1.25 internal thread insert welded to both ends of the flange for mounting temperature sensors.

[0010] Preferably, the power regulating device and the temperature controller are both fixed to a 2mm thick aluminum alloy heat sink plate on the inner wall of the control console, and the two are connected by a 9-pin aviation plug and a shielded cable.

[0011] Preferably, the main control PLC and the temperature controller are fixed in the control console by DIN35 rail clamping, and the main control PLC is connected to the operation panel on the front panel of the control console by a 26-core flat ribbon cable.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention enables the heating chamber to form a geometrically precise, controlled, closed-loop system. Infrared radiation uniformly irradiates the sample at fixed intervals, and real-time temperature signals are synchronously fed back to the outside of the channel. The power is finely adjusted in real time by the control algorithm. At the same time, water vapor is directionally discharged and adsorbed by a desiccant, preventing condensation or contamination of optical and sensing elements inside the chamber, thereby improving drying consistency, measurement repeatability, and equipment cleanliness.

[0014] This invention simplifies wiring, improves electromagnetic interference resistance, provides faster closed-loop temperature control response and more accurate power matching, shortens the detection cycle, and reduces energy consumption. The modular structure mounted on a base significantly reduces weight and floor space, enabling portable and rapid moisture detection on production lines or outdoors without external AC power. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present utility model. Figure 1 ;

[0016] Figure 2 This is an enlarged view of part A of the present invention;

[0017] Figure 3 This is an enlarged view of part B of the present utility model;

[0018] Figure 4 This is a schematic diagram of the overall structure of the present utility model. Figure 2 ;

[0019] Figure 5 This is an enlarged view of part C of this utility model.

[0020] In the diagram: 1. Base; 2. Detection stage; 3. Control console; 4. Sample heating group; 5. Desiccant bottle group; 6. Air inlet; 7. Exhaust outlet; 8. Drying bottle; 9. Temperature detection channel; 10. Temperature sensor; 11. Infrared heating module; 12. Power adjustment device; 13. Temperature controller; 14. Main control PLC; 15. Power supply module. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example

[0025] Please see Figure 1-5 This utility model provides a technical solution:

[0026] A moisture analyzer integrating an infrared heating module is provided. A detection platform 2 and a control platform 3 are respectively located on the upper sides of a base 1. A sample heating group 4 is located above the control platform 3. A desiccant bottle group 5 is located above the detection platform 2. An air inlet 6 and an exhaust port 7 are respectively located on the upper sides of the sample heating group 4. At least two desiccant bottles 8 are located above the desiccant bottle group 5. Temperature sensors 10 are located on both sides of a temperature detection channel 9. Infrared heating modules 11 are also located on both sides of the temperature detection channel 9 and are correspondingly installed at one end of the temperature sensors 10. The infrared heating modules 11 are electrically connected to a power adjustment device 12. The power adjustment device 12 is electrically connected to a temperature controller 13. The temperature controller 13 is electrically connected to a main control PLC 14. A power supply module 15 is electrically connected to the main control PLC 14.

[0027] At the center of the front of the base, a vertically arranged sample heating assembly is... High-strength support columns are welded to the top plate of the control console. The heating unit is a 304 stainless steel cylindrical cavity with an outer diameter of φ70mm. The cylinder cover is screwed onto the cylinder body using an M50×2 external thread, and a silicone rubber O-ring is embedded in the mating surface to achieve an airtight seal. G1 / 8″ internal thread quick-connect fittings are symmetrically welded to the front and back of the cylinder cover, with the air inlet on the left and the exhaust outlet on the right. Both are connected to the heating chamber by high-temperature resistant silicone hoses with an inner diameter of φ4mm and a wall thickness of 1mm. The sample tray is a 60mm diameter quartz glass plate, supported at the center of the cylinder body by a ceramic insulating column at the lower end. Two infrared heating modules are symmetrically installed 15mm directly below the tray. The lamps are fixed to the outer wall of the cylinder body by four M4×12 hexagon socket screws via aluminum alloy pressure plates and quartz fiber heat insulation pads. A 2mm gap is maintained between each lamp and its corresponding temperature sensor on the outside. The sensor is inserted into the flanged insert of the U-shaped temperature detection channel via an M8×1.25 thread. The channel has an inner diameter of φ10mm and is detachable for easy calibration or replacement.

[0028] The exhaust humidified airflow enters the desiccant bottle assembly inside the testing station through the exhaust port: In this embodiment, two 300mL glass desiccant bottles are arranged side by side, with G1 / 4″ external thread connectors welded to the caps, and the two are connected by a U-shaped... A stainless steel rigid tube is used for connection. The bottle is filled with color-changing silica gel with a particle size of 2–4 mm; it is time to replace when the silica gel turns completely red. The rigid tube outlet is connected to the exhaust muffler via a flexible tube of the same specification.

[0029] During operation, the operator unscrews the cap, places the pre-weighed sample (m0) onto the tray surface, tightens the cap, and sets the target temperature curve via the control panel. After the PLC starts, the power regulation device applies initial PWM to the infrared heating module, and the temperature sensor updates the real-time temperature T at 1-second intervals. tThe sample is sent to the temperature controller, and after PID comparison, the output adjustment signal ΔP returns to the control device to achieve closed-loop constant temperature with an accuracy of ±0.5℃. During the drying process, the silica gel in the drying bottle shows a gradient color change from blue to pink, which visually reflects the moisture load. At the end, the sample is taken out and weighed to obtain the mass m1, and the moisture content can be calculated according to (m0-m1) / m0×100%.

[0030] In this embodiment, the core principle is to directly penetrate and heat the sample using near-mid-infrared radiation, causing free water and some bound water to vaporize in a very short time. The continuously generated high-temperature water vapor flows along a unidirectional gas path under the pressure difference between the inlet and outlet, carrying away heat through the temperature detection channel and being adsorbed by the color-changing silica gel in the drying bottle. Since the radiation energy decays cosinely with the azimuth angle, the two infrared lamps are symmetrically arranged and maintain a constant distance from the sample tray, ensuring uniform irradiation of the sample surface. A quartz fiber insulation layer prevents heat conduction to the cylinder wall. The U-shaped stainless steel temperature detection channel is attached to the outer wall of the heating chamber, shielding it from direct lamp radiation while ensuring the temperature sensor collects the true instantaneous temperature inside the chamber, thus enabling the closed-loop PID to complete power correction in milliseconds. The entire drying, temperature measurement, and dehumidification process forms a stable dynamic equilibrium, preventing steam from condensing inside the chamber. The infrared elements and sensors remain clean at all times, ensuring measurement repeatability.

[0031] To accommodate samples of varying particle sizes and viscosities, the vertical cylindrical heating chamber can be replaced with a horizontal rotating cylinder structure. The tray and cylinder rotate slowly coaxially, causing the sample to form a uniform thin film under centrifugal force, further improving irradiation efficiency. The rotation drive motor can be directly controlled by the PLC's PWM port, eliminating the need for an additional control board. When extremely lightweight requirements exist on-site, a single-bottle drying solution can be used: eliminating the parallel desiccant bottle and simply connecting a 0.22μm PTFE hydrophobic membrane in series at the exhaust end achieves moisture prevention, reducing the overall instrument weight by approximately 15%. If the power grid in the testing environment is stable, the battery module can be replaced with a 220V AC-DC converter, while the original aviation plug interface remains unchanged, facilitating long-term laboratory operation and reducing battery maintenance costs.

[0032] Optional airflow enhancement structures include connecting a low-noise micro turbopump in series at the exhaust end, forming a power output of 2 L / min. 1 The negative pressure suction allows water vapor to pass through the temperature detection channel more quickly, shortening the overall measurement time. For high-salt or highly volatile solvent samples, the heating chamber cover can be replaced with a glass-fluororubber sandwich observation window structure, allowing the operator to observe the surface boiling state in real time and trigger time-sharing power limiting of the lamps via PLC to avoid splash contamination.

[0033] Inside the temperature detection channel, air and water vapor from the vaporized sample continuously exchange. The temperature sensor detects the gas temperature in real time and converts the analog voltage signal into a digital signal, which is then transmitted to the temperature controller. The temperature controller compares this real-time value with a preset heating curve. After determining the deviation, it calculates the required power percentage in its locally embedded PID module. The isolated PWM signal is then sent to the power regulation device. The power regulation device incorporates a thyristor phase-shifting and wideband filtering network, which can continuously change the current of the infrared heating module within the range of 0–150W, achieving millisecond-level dynamic temperature control.

[0034] The output of the power regulation device is simultaneously sent back to the main control PLC as a status byte. The PLC makes a logical judgment based on three parameters: lamp power, sensor temperature and running time. If the temperature rise rate is abnormal or the power reaches the upper limit but fails to rise, an audible and visual alarm is triggered and the main power supply is cut off. If the measured time reaches the set time and the temperature is stable, the PLC sends a completion command, turns off the lamp and starts the exhaust fan for delayed cooling.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A moisture analyzer with an integrated infrared heating module, comprising a base (1), a temperature detection channel (9), and a power supply module (15), characterized in that: The base (1) is provided with a detection platform (2) and a control platform (3) on both sides above it. The control platform (3) is provided with a sample heating group (4). The detection platform (2) is provided with a desiccant bottle group (5). The sample heating group (4) is provided with an air inlet (6) and an exhaust port (7) on both sides above it. The desiccant bottle group (5) is provided with at least two desiccant bottles (8). The temperature detection channel (9) is provided with temperature sensors (10) on both sides. The temperature detection channel (9) is also provided with infrared heating modules (11) on both sides, and is installed at one end of the temperature sensor (10). The infrared heating module (11) is electrically connected to the power adjustment device (12). The power adjustment device (12) is electrically connected to the temperature controller (13). The temperature controller (13) is electrically connected to the main control PLC (14). The power module (15) is electrically connected to the main control PLC (14).

2. A moisture analyzer with an integrated infrared heating module according to claim 1, characterized in that: The sample heating assembly (4) is a vertically arranged cylindrical sealed cavity. The upper end of the cylinder is provided with a detachable cylinder cover. The cylinder cover is screwed onto the cylinder by an external thread of M50×2, and silicone rubber is provided between the mating surfaces. "O" ring seal.

3. A moisture analyzer with an integrated infrared heating module according to claim 1, characterized in that: The air inlet (6) and the exhaust outlet (7) are respectively connected by an inner diameter The high-temperature resistant silicone tubing is connected to the G1 / 8″ quick-connect fitting on the cap of the sample heating assembly (4).

4. A moisture analyzer with an integrated infrared heating module according to claim 1, characterized in that: The temperature detection channel (9) is a U-shaped 304 stainless steel tube with an inner diameter of Add at both ends of the pipe wall The passivated flanges; M8×1.25 internal thread inserts are welded to the flanges at both ends for mounting temperature sensors (10).

5. A moisture analyzer with an integrated infrared heating module according to claim 1, characterized in that: The power adjustment device (12) and the temperature controller (13) are fixed together on the 2mm thick aluminum alloy heat sink plate on the inner wall of the control console (3), and the two are connected by a 9-pin aviation plug and shielded cable.

6. A moisture analyzer with an integrated infrared heating module according to claim 1, characterized in that: The main control PLC (14) and the temperature controller (13) are fixed in the control console (3) by DIN35 guide rail clamping. The main control PLC (14) and the operation panel on the front panel of the control console (3) are connected by a 26-core flat ribbon cable.

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