Formaldehyde detection and purification demonstration device

Abstract

This invention belongs to the technical field of teaching demonstration equipment, specifically providing a formaldehyde detection and purification demonstration device. It includes a generation chamber, a detection chamber, a purification chamber, and a verification chamber. The generation chamber contains a heating platform and a container. The detection chamber has a tortuous gas channel, with multiple detection carriers arranged sequentially along its length. The surface of each detection carrier is coated with a purple potassium permanganate solution, which reacts with formaldehyde gas to change color. This arrangement transforms the invisible formaldehyde gas into a visible color change, visually demonstrating the detection principle. After passing through the detection chamber, the gas enters the purification chamber and is absorbed by the solution, demonstrating the purification process. Finally, it enters the verification chamber, where the purification effect is visually verified by whether the solution changes color. The entire device has a clear structure, relatively low cost, and meets the needs of teaching demonstrations requiring a complete process and strong visualization, solving the problem that existing professional instruments cannot achieve a closed-loop teaching process.

Description

Technical Field

[0001] This application belongs to the technical field of teaching demonstration equipment, specifically a formaldehyde detection and purification demonstration device. Background Technology

[0002] Formaldehyde, a common indoor air pollutant, is widely found in decorative materials, furniture adhesives, and various everyday items. Although it is difficult for people to detect directly in daily life, its potential harm to the human respiratory and immune systems has been widely confirmed. To detect formaldehyde, various methods are available on the market. These methods can achieve relatively accurate quantitative analysis in laboratory or professional environments, but due to their high level of expertise and high cost, they cannot be widely promoted in teaching demonstrations, public education, and other similar settings.

[0003] In response to the above problems, although some integrated and portable formaldehyde detection instruments have emerged in recent years, their design focuses on detection accuracy and miniaturization, without fully considering the needs of teaching demonstrations. This makes it difficult to form a complete teaching loop of "release-detection-removal-verification", and students cannot intuitively see the entire process of formaldehyde from release to detection and removal. Summary of the Invention

[0004] Based on the above-mentioned technical problems, this application provides a formaldehyde detection and purification demonstration device to solve the technical problem of the lack of formaldehyde detection devices suitable for teaching demonstrations in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a formaldehyde detection and purification demonstration device, comprising: The generating chamber is equipped with a heating platform inside and a container located above the heating platform. The generating chamber has a first air outlet, and the first air outlet is equipped with an air intake unit. The testing chamber has an internal gas channel that bends upwards. The lower end of the gas channel forms a first air inlet, and the higher end forms a second air outlet. The first air inlet is connected to the air outlet of the intake unit. Multiple detection carriers are placed inside the gas channel, and the surface of the detection carriers is used to attach potassium permanganate solution. The sidewalls of the testing chamber containing the gas channel are made of transparent material. A purification chamber for storing potassium permanganate solution, the purification chamber having a first air inlet pipe and a first air outlet pipe, the inlet end of the first air inlet pipe communicating with a second air outlet, the outlet end of the first air inlet pipe extending below the surface of the potassium permanganate solution, and the first air outlet pipe positioned above the surface of the potassium permanganate solution; and The verification chamber is used to store potassium permanganate solution. The verification chamber is equipped with a second air inlet pipe. The air inlet end of the second air inlet pipe is connected to the first air outlet pipe, and the air outlet end of the second air inlet pipe extends to below the liquid surface of the potassium permanganate solution.

[0006] In one possible implementation, the top of the generating chamber has a sliding hole, and the generating chamber also includes a plug having a slide rod that slides in conjunction with the sliding hole, the plug being used to seal against the top opening of the container.

[0007] In one possible implementation, multiple containers are provided, and multiple plugs are provided corresponding to each container; the inner wall of the detection chamber is provided with a magnetic suction element, which magnetically engages with the plug; the plug has a sealed state that covers the top opening of the container, and an open state that is attracted to the top wall of the detection chamber by the magnetic suction element.

[0008] In one possible implementation, the gas channel comprises multiple channel units distributed from bottom to top, the channel units being inclined, with the lower end of one channel unit connected to the upper end of the next channel unit; the detection carrier is a rolling element.

[0009] In one possible implementation, the uppermost channel unit has a feeding port extending upwards through the top wall of the detection chamber, and the lowermost channel unit has a discharge port extending downwards through the bottom wall of the detection chamber. Both the feeding port and the discharge port are equipped with a switch plate, which is used to control the opening and closing of the corresponding feeding port or discharge port.

[0010] In one possible implementation, the top of the testing chamber is further provided with a feeding unit, the feeding unit comprising: The outer shell has a receiving cavity, with a feeding port at the top and a discharging channel on the lower side, the discharging channel being connected to the feeding port; The distributor is rotatably disposed in the receiving cavity about a horizontal axis. Multiple receiving slots are distributed at intervals along the circumferential direction on the outer periphery of the distributor, and the rotating shaft of the distributor extends to the outside of the receiving cavity. A hopper is located above the outer shell and communicates with the feed inlet. The hopper is used to store the detection carrier.

[0011] In one possible implementation, the receiving cavity forms a liquid storage space below the position where it communicates with the discharge channel, the liquid storage space being used to store potassium permanganate solution, and the side wall of the distributor is provided with an annular drainage groove along its circumference.

[0012] In one possible implementation, the gas channel is an arc shape that bends from bottom to top.

[0013] In one possible implementation, the detection chamber further includes a colorimetric card located at the center of the gas channel. The colorimetric card has multiple color segments arranged sequentially along its circumference, with the multiple color segments arranged from dark to light.

[0014] In one possible implementation, the generating room is also equipped with a formaldehyde sensor.

[0015] Compared with existing technologies, the beneficial effects of the formaldehyde detection and purification demonstration device provided in this application are: The formaldehyde detection and purification demonstration device provided in this application includes a generation chamber, a detection chamber, a purification chamber, and a verification chamber. The generation chamber contains a heating table and a container. The detection chamber contains a tortuous gas channel, within which multiple detection carriers are sequentially arranged along their length. The surfaces of the detection carriers are coated with a purple potassium permanganate solution, which reacts with formaldehyde gas to change color. Both the purification chamber and the verification chamber contain a certain amount of potassium permanganate solution.

[0016] During the teaching demonstration, a detection carrier coated with potassium permanganate solution is placed in the gas channel. The sample to be tested (such as leather, glue, composite board, etc.) is placed in the container, and the sample is heated by a heating platform to accelerate the volatilization of formaldehyde. The volatilized formaldehyde is transported into the gas channel of the detection chamber through the intake unit and gas pipeline. When formaldehyde passes through the detection carrier, it comes into contact with and reacts with the potassium permanganate solution on the surface of the carrier, and students can visually observe the color change of the detection carrier. During the demonstration, the amount of color change and the time of color change of the detection carrier are recorded, which allows analysis of the amount of formaldehyde volatilized from different samples and the volatilization rate of formaldehyde at different temperatures. To prevent small amounts of formaldehyde from escaping to the outside environment and causing health hazards to surrounding students, a purification chamber is also set up at the outlet of the gas channel in the detection chamber. The purification chamber adsorbs formaldehyde using potassium permanganate solution. To verify the adsorption effect of the purification chamber, a verification chamber is connected in series after the purification chamber. As long as the potassium permanganate solution in the verification chamber does not change color, it indicates that the formaldehyde in the gas has been completely removed.

[0017] This application sequentially connects four functional units—the generation chamber, the detection chamber, the purification chamber, and the verification chamber—to construct a complete and visually appealing closed-loop teaching demonstration of formaldehyde treatment. The detection chamber contains a potassium permanganate detection carrier, which changes color upon contact with formaldehyde. This setup transforms the invisible formaldehyde gas into a visible color change, intuitively demonstrating the detection principle. After passing through the detection chamber, the gas enters the purification chamber where it is absorbed by a solution, demonstrating the purification process. Finally, it enters the verification chamber, where the color change of the solution visually verifies the purification effect. The entire device has a clear structure, coherent logic, and relatively low cost, meeting the needs of teaching demonstrations that require a complete process and strong visualization, and solving the problem that existing professional instruments cannot achieve a closed-loop teaching system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A perspective view of a formaldehyde detection and purification demonstration device provided in one embodiment of this application; Figure 2 An internal cross-sectional view of a formaldehyde detection and purification demonstration device provided in one embodiment of this application; Figure 3 This is a schematic diagram of the internal structure of the generating chamber in one embodiment of this application; Figure 4 This is a schematic diagram of the internal structure of the testing chamber in one embodiment of this application; Figure 5 This is a schematic diagram of the structure of the distributor in one embodiment of this application; Figure 6 This is a schematic diagram of the internal structure of the testing chamber in another embodiment of this application; Explanation of reference numerals in the attached figures: 10. Generating chamber; 11. Heating platform; 12. Container; 13. Formaldehyde sensor; 14. Plug; 141. Sliding rod; 15. Magnetic suction component; 16. Air intake unit; 20. Detection chamber; 21. Gas channel; 211. Feeding port; 212. Discharge port; 213. Detection carrier; 22. Switch board; 23. Feeding unit; 231. Outer shell; 2311. Discharge channel; 232. Distributor; 2321. Receiving tank; 2322. Drainage tank; 233. Hopper; 24. Colorimetric card; 30. Purification chamber; 31. First air inlet pipe; 32. First air outlet pipe; 40. Verification chamber; 41. Second air inlet pipe. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] Please refer to the following: Figures 1 to 6 The formaldehyde detection and purification demonstration device provided in the embodiments of this application will be described below.

[0026] This application provides a formaldehyde detection and purification demonstration device, which includes a generation chamber 10, a detection chamber 20, a purification chamber 30 and a verification chamber 40 connected in series along the gas flow direction.

[0027] The generating chamber 10 contains a heating platform 11 and a container 12 located above the heating platform 11. The heating platform 11 is an electrically heated product that generates heat energy when powered on to maintain a constant temperature for the sample in the container 12. The generating chamber 10 has a first gas outlet, which is equipped with a suction unit 16 for drawing in formaldehyde gas volatilized from the sample. The detection chamber 20 contains a gas channel 21, which is bends upwards. This bends extend the airflow path and reduce the airflow speed. The lower end of the gas channel 21 forms a first air inlet, and the higher end of the gas channel 21 forms a second air outlet. The first air inlet is connected to the air outlet of the intake unit 16. Multiple detection carriers 213 are provided inside the gas channel 21, and the surface of the detection carriers 213 is used to adhere potassium permanganate solution. The detection chamber 20 has a transparent sidewall provided by the gas channel 21. The purification chamber 30 is used to store potassium permanganate solution. The purification chamber 30 is provided with a first air inlet pipe 31 and a first air outlet pipe 32. The air inlet end of the first air inlet pipe 31 is connected to the second air outlet, and the air outlet end of the first air inlet pipe 31 extends below the surface of the potassium permanganate solution. The first air outlet pipe 32 is positioned above the surface of the potassium permanganate solution. The verification chamber 40 is used to store potassium permanganate solution. The verification chamber 40 is provided with a second air inlet pipe 41, the air inlet end of the second air inlet pipe 41 is connected to the first air outlet pipe 32, and the air outlet end of the second air inlet pipe 41 extends below the surface of the potassium permanganate solution. Cleanroom 30 is a closed container, while validation room 40 is an open container.

[0028] The generation chamber 10 is a closed or semi-closed cavity with a heating platform 11 at its bottom. This heating platform 11 can be an electric heating plate or a heating platform with built-in resistance wire. Above the heating platform 11, one or more containers 12 are placed to hold formaldehyde release sources. These containers 12 can be open petri dishes, beakers, or sample boxes, and can contain formalin solution, formaldehyde-containing board fragments, glue, or other simulated release sources. A first air outlet is provided on the side wall or top of the generation chamber 10, and an air intake unit 16 is installed at this outlet. This air intake unit 16 can be an existing product such as a miniature air pump or fan, used to extract the formaldehyde-containing air from the generation chamber 10 and pump it into the detection chamber 20. The power of the air intake unit 16 should not be too high to ensure that the formaldehyde-containing air passes through the detection chamber 20 smoothly and at a low speed. A commercially available small air pump can be directly selected as the air intake unit 16. Petri dishes, beakers, etc., are common containers in school laboratories and can be directly selected. The generating chamber can be assembled from acrylic sheets or other materials. An air inlet is provided on the side wall of the generating chamber to ensure smooth air intake during the extraction by the suction unit 16. A gas collection hood can be installed on the container 12 to facilitate the collection of volatile formaldehyde gas.

[0029] The detection chamber 20 is a box or column with side walls made of transparent acrylic panels or glass. Inside, there is a gas channel 21 that extends upwards in a zigzag, serpentine, or spiral shape, or a channel formed by partitions. The lower end of the gas channel 21 forms a first air inlet, which connects to the air outlet of the intake unit 16 of the generating chamber 10 via a rubber hose or rigid pipe. The rubber hose is connected and fixed using clamps, and the rigid pipe is bonded and fixed using adhesive. The upper end of the gas channel 21 forms a second air outlet. Inside the gas channel 21, multiple detection carriers 213 are placed. These detection carriers 213 can be rough-surfaced glass beads, ceramic rings, porous plastic spheres, or pebble-shaped components, their surfaces pre-impregnated or coated with an acidic potassium permanganate solution.

[0030] When formaldehyde-containing gas flows through, the formaldehyde undergoes a redox reaction with potassium permanganate, causing the surface color of the detection carrier 213 to gradually change from purplish-red to brown or colorless, thus achieving intuitive and visual detection of formaldehyde. During the demonstration, the amount of volatilized formaldehyde can be analyzed by observing the number of color-changing detection carriers 213, the volatilization rate of formaldehyde can be analyzed by measuring the color change time, and the differences in formaldehyde content and volatilization rate between different samples can be determined by comparing the changes in the detection carriers 213 corresponding to different samples.

[0031] To clearly observe the color change, the detection carrier 213 is preferably colorless or white. The surface of the detection carrier 213 should have a certain roughness (such as a frosted surface) and high compatibility with water, so that the potassium permanganate solution can be uniformly adhered to its surface. For example, the detection carrier 213 can be a frosted white ceramic ball.

[0032] The purification chamber 30 is a container 12, such as a glass bottle or storage tank, storing a measured amount of potassium permanganate absorbent solution. A first inlet pipe 31 and a first outlet pipe 32 are located on its top or upper part. The inlet end of the first inlet pipe 31 is connected to the second outlet of the detection chamber 20, and the outlet end of the first inlet pipe 31 extends below the surface of the potassium permanganate solution in the purification chamber 30, allowing the introduced gas to pass through the solution in a bubbling manner, thereby being fully oxidized and absorbed. The outlet of the first outlet pipe 32 is located above the liquid surface in the purification chamber 30, used to discharge the preliminarily purified gas.

[0033] The verification chamber 40 is also a container 12 storing fresh potassium permanganate absorption solution, with a structure similar to the purification chamber 30. It has a second air inlet pipe 41 inside, the inlet end of which is connected to the first air outlet pipe 32 of the purification chamber 30 via a pipe, and the outlet end also extends below the liquid surface of the solution in the verification chamber 40. Gas from the purification chamber 30 is bubbled again through the potassium permanganate solution in the verification chamber 40. If the formaldehyde in the gas has been substantially removed by the purification chamber 30, the color of the solution in the verification chamber 40 should remain unchanged or change very little, thus visually verifying the purification effect. This prevents formaldehyde from diffusing into the classroom air and affecting the health of students and teachers.

[0034] Compared with the prior art, the beneficial effects of the formaldehyde detection and purification demonstration device provided in this application are: The formaldehyde detection and purification demonstration device provided in this application includes a generation chamber 10, a detection chamber 20, a purification chamber 30, and a verification chamber 40. The generation chamber 10 contains a heating platform 11 and a container 12. The detection chamber 20 has a tortuous gas channel 21 inside, with multiple detection carriers 213 arranged sequentially along its length. The surface of each detection carrier 213 is coated with a purple potassium permanganate solution, which reacts with formaldehyde gas to change color. Both the purification chamber 30 and the verification chamber 40 contain a certain amount of potassium permanganate solution.

[0035] During the teaching demonstration, a detection carrier 213 coated with potassium permanganate solution is placed in the gas channel 21. The sample to be tested (such as leather, glue, composite board, etc.) is placed in the container 12, and the sample is heated by the heating table 11 to accelerate the volatilization of formaldehyde. The volatilized formaldehyde is transported to the gas channel 21 of the detection chamber 20 through the suction unit 16 and the gas pipeline. When the formaldehyde passes through the detection carrier 213, it can come into contact with and react with the potassium permanganate solution on the surface of the detection carrier 213, and students can visually observe the color change of the detection carrier 213. During the demonstration, the number of color changes and the color change time of the detection carrier 213 are recorded, which allows analysis of the amount of formaldehyde volatilized in different samples and the volatilization rate of formaldehyde at different temperatures. To prevent a small amount of formaldehyde from escaping to the outside environment and causing health hazards to surrounding students, a purification chamber 30 is also provided at the outlet of the gas channel 21 of the detection chamber 20. The purification chamber 30 adsorbs formaldehyde using potassium permanganate solution. To verify the adsorption effect of the purification chamber 30, a verification chamber 40 is connected in series after the purification chamber 30. If the potassium permanganate solution in the verification chamber 40 does not change color, it indicates that the formaldehyde in the gas has been completely removed. The verification chamber 40 can be a beaker or similar container.

[0036] This embodiment connects four functional units—generating chamber 10, detection chamber 20, purification chamber 30, and verification chamber 40—in sequence to construct a complete and visually appealing closed-loop teaching demonstration of formaldehyde treatment. Detection chamber 20 contains a potassium permanganate detection carrier 213, which changes color upon contact with formaldehyde. This setup transforms the invisible formaldehyde gas into a visible color change, intuitively demonstrating the detection principle. After passing through detection chamber 20, the gas enters purification chamber 30 and is absorbed by the solution, demonstrating the purification process. Finally, it enters verification chamber 40, where the purification effect is visually verified by observing whether the solution changes color. The entire device has a clear structure, coherent logic, and relatively low cost, meeting the needs of teaching demonstrations that require a complete process and strong visualization, and solving the problem that existing professional instruments cannot achieve a closed-loop teaching demonstration.

[0037] Please see Figure 2 and Figure 3 In some possible embodiments, the top of the generating chamber 10 is provided with a sliding hole, and the generating chamber 10 also includes a plug 14, which has a slide rod 141 that slides in conjunction with the sliding hole, and the plug 14 is used to seal in conjunction with the top opening of the container 12.

[0038] The main body of the plug 14 can be a rubber stopper, used to tightly insert into the top opening of the container 12 to achieve a seal. Alternatively, the plug 14 can also be a sealing cap that threads with the opening of the container 12. A vertical sliding rod 141 is fixedly connected to the upper center of the plug 14. The diameter of the sliding rod 141 is adapted to the diameter of the sliding hole at the top of the generating chamber 10, allowing the sliding rod 141 to slide freely up and down in the sliding hole with good airtightness. To further improve the sealing performance, an O-ring can be installed between the sliding rod 141 and the sliding hole. By manually pulling or pressing down the sliding rod 141, the plug 14 can be moved away from or sealed to the container 12, thereby controlling the release or sealing of the formaldehyde release source.

[0039] When testing multiple samples, multiple samples can be pre-placed in different containers 12, with the top openings of containers 12 sealed using caps 14. After the samples are placed in, the door of the generation chamber 10 is closed and kept sealed. During testing, the corresponding container 12 is opened, while the remaining containers 12 remain closed. Since multiple samples are pre-placed in the generation chamber 10, the door of the generation chamber 10 does not need to be opened during the demonstration. Furthermore, simultaneous heating of multiple samples using the heating stage 11 facilitates formaldehyde volatilization and reduces waiting time. The heating range of the heating stage 11 is 40-60℃.

[0040] Please see Figure 2 and Figure 3In some possible embodiments, multiple containers 12 are provided, each for holding different samples. Multiple caps 14 are provided corresponding to each container 12; the inner wall of the detection chamber 20 is provided with a magnetic suction element 15, which magnetically engages with the caps 14; the caps 14 have a sealed state, covering the top opening of the container 12, and an open state, being attracted to the top wall of the detection chamber 20 by the magnetic suction element 15. The magnetic suction element 15 temporarily attracts and fixes the caps 14, preventing them from falling off.

[0041] When the plug 14 is made of iron, the magnetic attractor 15 is a magnet. When the plug 14 is equipped with a magnet, the magnetic attractor 15 can be an iron sheet or a magnet that has a magnetic attraction to the plug 14.

[0042] Please see Figure 2 and Figure 4 In some possible embodiments, the gas channel 21 includes multiple channel units distributed from bottom to top, the channel units are inclined, and the lower end of the previous channel unit is connected to the upper end of the next channel unit; the detection carrier 213 is a rolling body.

[0043] The gas channel 21 inside the detection chamber 20 consists of multiple interconnected channel units. Each channel unit is an upwardly inclined straight cylinder or channel, for example, inclined at an angle of 5-15 degrees to the horizontal plane. The lower end (lower position end) of the previous channel unit is connected to the higher end (higher position end) of the next channel unit through a bend or connecting port, forming a stepped upward path as a whole.

[0044] The detection carrier 213 is specifically a rollable sphere or cylinder, such as a glass marble or ceramic ball with a diameter of 5-15 mm. These rolling elements naturally accumulate within each inclined channel unit. When formaldehyde-containing gas flows from the lower end to the higher end of the channel unit, the gas passes through the gaps between the rolling elements and comes into full contact with them. This structure prolongs the contact path and time between the gas and the detection carrier 213.

[0045] To facilitate students' visual comparison of the color change of the rolling element, color cards can be printed to compare the color change of the detection carrier 213. The color cards have multiple color blocks distributed in a gradient from purplish-red to grayish-white, making it easy for students to judge the color change of the detection carrier 213 based on the color blocks.

[0046] Please see Figure 4In some possible embodiments, the uppermost channel unit has a feeding port 211 extending upwards through the top wall of the detection chamber 20, and the lowermost channel unit has a discharge port 212 extending downwards through the bottom wall of the detection chamber 20. A switch plate 22 is hinged or slidably installed at the feeding port 211 and discharge port 212, respectively. The switch plate 22 controls the opening and closing of the corresponding feeding port 211 or discharge port 212. The switch plate 22 can be a rotating cover or a pull-out baffle. When the switch plate 22 is closed, it seals the corresponding opening, ensuring the airtightness of the gas channel 21. When a new detection carrier 213 (rolling element) needs to be added, the switch plate 22 of the feeding port 211 is opened, and the carrier is added through this opening. When an old carrier that has reacted and changed color needs to be replaced, the switch plate 22 of the discharge port 212 is opened, and the old carrier rolls out by itself under the action of gravity and the inclined plane, achieving convenient maintenance. The side panels of the testing chamber 20 can be made removable, making it easy to remove the side panels and wipe and clean the inside after the test.

[0047] In this embodiment, a feed port 211 and a discharge port 212 with switch plates 22 are respectively provided at the highest and lowest points of the gas channel 21, greatly facilitating the replenishment and replacement of the detection carrier 213 (rolling element). Operators can remove the old carrier and add the new carrier without disassembling the main body of the detection chamber 20, making maintenance simple and quick. This ensures that the detection function of the device can be quickly restored during continuous or multiple demonstrations, maintaining the continuity and efficiency of the demonstrations.

[0048] Please see Figure 4 and Figure 5 In some possible embodiments, the top of the detection chamber 20 is further provided with a feeding unit 23, which includes a housing 231, a distributor 232, and a hopper 233. The housing 231 has a receiving cavity with an inlet at the top and an outlet channel 2311 on the lower side, the end of which is connected to the feeding port 211 at the top of the detection chamber 20. The distributor 232 is shaped like a cylindrical roller or a gear-shaped wheel, and is horizontally mounted in the receiving cavity via a rotating shaft. On the outer circumferential surface of the distributor 232, multiple grooves are evenly distributed along the circumferential direction as receiving slots 2321, each groove being able to accommodate one detection carrier 213 (rolling body). One end of the rotating shaft of the distributor 232 extends out of the housing 231 and is connected to a manual knob or driven by a micro stepper motor. A hopper 233 is fixedly mounted above the housing 231, with its lower opening communicating with the inlet of the housing 231, for storing a large number of spare detection carriers 213.

[0049] When the switch plate 22 at the feeding port 211 is turned on, the distributor 232 is rotated. As its groove passes under the hopper 233, it receives a detection carrier 213. As it continues to rotate until it aligns with the discharge channel 2311, the detection carrier 213 rolls into the discharge channel 2311 and then falls through the feeding port 211 into the gas channel 21 of the detection chamber 20, achieving quantitative and controllable feeding. After feeding is complete, the switch plate 22 is turned off.

[0050] Please see Figure 4 In some possible embodiments, inside the housing 231 of the feeding unit 23, a liquid storage space is formed at the bottom of the receiving cavity and below the position where the receiving cavity communicates with the discharge channel 2311. The liquid storage space is used to store potassium permanganate solution, and the liquid level is lower than the center line of the rotating shaft of the distributor 232. An annular drainage groove 2322 is formed on the side wall of the distributor 232 along its circumference.

[0051] When the dispenser 232 rotates, the groove carrying the detection carrier 213 passes through the liquid storage space, allowing it to soak and absorb the potassium permanganate solution. Excess solution flows back into the liquid storage space from the drain trough 2322 after leaving the liquid surface, preventing it from being carried into the discharge channel 2311 and causing leakage, thus ensuring that the carrier is uniformly coated with a layer of reagent solution. A liquid inlet hole communicating with the liquid storage space can be provided on the outer casing 231, allowing potassium permanganate solution to be added into the inlet hole via a dropper.

[0052] In this embodiment, a liquid storage space is integrated within the feeding unit 23, allowing the detection carrier 213 to be automatically and uniformly impregnated with potassium permanganate solution during the rotation of the distributor 232 before entering the detection chamber 20. The design of the drainage tank 2322 effectively recovers excess solution, avoiding reagent waste and leakage contamination.

[0053] Please see Figure 6 In some possible embodiments, the gas channel 21 is an arc shape that bends upwards. The detection chamber 20 also includes a colorimetric card 24 located at the center of the gas channel 21. The colorimetric card 24 has multiple color segments arranged sequentially along its circumference, and the multiple color segments are arranged in order from dark to light according to the color change of the detection carrier 213. The colorimetric card 24 is a circular or fan-shaped hard card that can rotate around its center.

[0054] In this embodiment, the color chart 24 provides an objective reference system for determining the color of the carrier 213. Students and observers can directly compare the color of the carrier after it changes color with the color segments on the color chart 24, which is more convenient.

[0055] A formaldehyde sensor 13 is also installed in the generation chamber 10. The formaldehyde sensor 13 is used to display the estimated formaldehyde concentration in the generation chamber 10 in real time. The formaldehyde sensor 13 provides an objective and digital detection method for experimental demonstration, which can be compared and verified with the subjective and visual results of carrier color change in the detection chamber 20.

[0056] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present invention specification has recorded each combined embodiment and can support different combined embodiments.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A formaldehyde detection and purification demonstration apparatus, characterized in that, The utility model relates to a kind of gas detection device, including: Generation chamber (10), inside being equipped with heating platform (11), and container (12) located above the heating platform (11), the generation chamber (10) has first gas outlet, the first gas outlet is equipped with suction unit (16); Detection chamber (20), inside with gas passage (21), the gas passage (21) is bent from bottom to top arrangement, the low end of the gas passage (21) forms first gas inlet, the high end of the gas passage (21) forms second gas outlet, the first gas inlet is communicated with the gas outlet end of the suction unit (16);The gas passage (21) is equipped with multiple detection carriers (213) inside, the surface of the detection carrier (213) is used to adhere potassium permanganate solution;The detection chamber (20) is equipped with the sidewall of the gas passage (21) is transparent material; Purification chamber (30) for storing potassium permanganate solution, the purification chamber (30) is equipped with first gas inlet pipe (31) and first gas outlet pipe (32), the gas inlet end of the first gas inlet pipe (31) is communicated with the second gas outlet, the gas outlet end of the first gas inlet pipe (31) extends below the liquid level of potassium permanganate solution, the first gas outlet pipe (32) is higher than the liquid level of potassium permanganate solution and is arranged;And Verification chamber (40) for storing potassium permanganate solution, the second gas inlet pipe (41) is equipped in the verification chamber (40), the gas inlet end of the second gas inlet pipe (41) is communicated with the first gas outlet pipe (32), the gas outlet end of the second gas inlet pipe (41) extends below the liquid level of potassium permanganate solution.

2. The formaldehyde detection and purifying demonstration device according to claim 1, characterized in that, The top of the generation chamber (10) is provided with a sliding hole, and the generation chamber (10) further includes a plug cover (14), the plug cover (14) has a sliding rod (141) that slidably engages with the sliding hole, and the plug cover (14) is configured to sealingly engage with the top opening of the container (12).

3. The formaldehyde detection and purifying demonstration device according to claim 2, characterized in that, The container (12) is provided with a plurality of plug covers (14) corresponding to the plurality of containers (12), respectively.

4. The formaldehyde detection and purifying demonstration device according to claim 1, characterized in that, The inner cavity top wall of the detection chamber (20) is provided with a magnetic attraction member (15), the magnetic attraction member (15) is magnetically attracted to the plug cover (14), the plug cover (14) has a plugging state of covering the top opening of the container (12), and an open state of being attracted to the top wall of the detection chamber (20) by the magnetic attraction member (15).

5. The formaldehyde detection and purifying demonstration device according to claim 4, characterized in that, The gas passage (21) includes a plurality of channel units distributed from bottom to top, the channel units are inclined, the low end of the upper channel unit is communicated with the high end of the lower channel unit, and the detection carrier (213) is a rolling body. The high end of the uppermost channel unit penetrates the top wall of the detection chamber (20) upward to form a charging port (211), the low end of the lowermost channel unit penetrates the bottom wall of the detection chamber (20) downward to form a discharging port (212), and the charging port (211) and the discharging port (212) are provided with a switch plate (22), the switch plate (22) is used to control the opening and closing of the corresponding charging port (211) or discharging port (212).

6. The formaldehyde detection and purifying demonstration device according to claim 5, characterized in that, The top of the detection chamber (20) is also provided with a feeding unit (23), which comprises: a shell (231) having a containing cavity, a feeding port being formed at the top of the containing cavity, and a discharging passage (2311) being formed at the lower side of the containing cavity and being in communication with the feeding port; a distributor (232) being rotatably arranged in the containing cavity about a horizontal axis, a plurality of containing grooves (2321) being spaced apart in the circumferential direction of the outer periphery of the distributor (232), and the rotating shaft of the distributor (232) extending out of the containing cavity; a hopper (233) being arranged above the shell (231) and being in communication with the feeding port, the hopper (233) being used for storing the detection carrier (213).

7. The formaldehyde detection and purifying demonstration device according to claim 6, characterized in that, The containing cavity forms a liquid storage space below the position in communication with the discharging passage (2311), the liquid storage space being used for storing potassium permanganate solution, and the side wall of the distributor (232) is provided with an annular drainage groove (2322) in the circumferential direction of the distributor (232).

8. The formaldehyde detection and purifying demonstration device according to claim 1, wherein, The gas passage (21) is an arc-shaped passage which is bent from bottom to top.

9. The formaldehyde detection and purifying demonstration device according to claim 8, characterized in that, The detection chamber (20) further comprises a colorimetric card (24) arranged at the center of the gas passage (21), the colorimetric card (24) having a plurality of color segments arranged in sequence in the circumferential direction of the colorimetric card (24), and the color segments being arranged in sequence from deep to light.

10. The formaldehyde detection and purifying demonstration device according to claim 1, wherein, The generating chamber (10) is further provided with a formaldehyde sensor (13).

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