Teaching research and learning experimental device

Abstract

This invention provides a teaching and research experimental device, including a support plate, an aquarium, a gas collecting cover, a light source, a carbon dioxide generator, and a gas collecting bottle. The gas collecting bottle includes a transparent bottle body, a bottle cap, a first flexible tube, a second flexible tube, a first on / off clamp, and a second on / off clamp. The bottle cap is closed at the mouth of the transparent bottle body to form a sealed cavity, which can be filled with water. The first port of the first flexible tube and the first port of the second flexible tube pass through the bottle cap and are connected to the sealed cavity. The second port of the first flexible tube can be sleeved onto the gas collecting cover, and the second port of the second flexible tube can draw in clear limewater. The first on / off clamp is set on the first flexible tube and controls its connection or disconnection, and the second on / off clamp is set on the second flexible tube and controls its connection or disconnection. This teaching and research experimental device can quickly collect high-purity oxygen, visually demonstrate the rate and volume change of oxygen production by photosynthesis, is simple to operate, has no site restrictions, is suitable for various research experiments, and has strong versatility.

Description

Technical Field

[0001] This invention relates to the field of scientific experimental teaching aids, and in particular to a teaching and research experimental device. Background Technology

[0002] Current textbooks present the following experimental setup for photosynthesis to produce oxygen: algae are placed in a beaker filled with water, a funnel is inverted, and a test tube is placed on top. Gas is collected in the test tube by water displacement. The mouth of the test tube is then blocked underwater with a thumb, the test tube is removed, and immediately inverted. A glowing splint or incense stick is then inserted into the test tube to verify the presence of oxygen. While this setup is simple in materials, it suffers from slow oxygen production, susceptibility to impurities leading to experimental failure, and requires a high level of skill to operate. It is generally used as a teacher demonstration experiment with limited student participation and is subject to numerous limitations in the experimental environment, resulting in a high failure rate.

[0003] To increase the rate of oxygen production, an experimental setup exists where a bottle is filled with water and algae. Squeezing the bottle squeezes out some water, creating space for oxygen production. Sodium bicarbonate is used to supply carbon dioxide to the water. The bottle is then placed under diffused light. The gas produced by the algae's photosynthesis concentrates at the top of the bottle, causing it to spring back. A glowing splint or incense stick is then inserted diagonally downwards through a verification hole in the collecting bottle. The user observes whether the glowing splint or incense stick reignites. If it does, it indicates that the algae have produced oxygen through photosynthesis. However, in actual experiments, the corrosiveness of sodium bicarbonate, excessively strong or weak light, insufficient oxygen production, and oxygen leakage due to the bottle's rebound reduce oxygen purity, affecting the experimental results. Furthermore, this setup only demonstrates the production of oxygen through photosynthesis, but cannot visually demonstrate the rate of oxygen production and volume changes, making the demonstration less engaging and hindering student comprehension. Additionally, the oxygen collected in this setup cannot be used for other research experiments, such as those involving oxygen-related chemical reactions. Furthermore, this experimental setup is only suitable for photosynthesis experiments and cannot be used for other scientific research experiments, thus its versatility is poor. Summary of the Invention

[0004] To achieve the main objective of this invention, it provides a teaching and research experimental device that can quickly collect high-purity oxygen produced by photosynthesis for use in chemical reaction experiments related to oxygen. It also provides a visual demonstration of the rate and volume change of oxygen production during photosynthesis, facilitating student understanding. Furthermore, the device is simple to operate, with no time or location restrictions, allowing teachers and students to conduct experiments independently at home, in classrooms, laboratories, or other suitable locations. It is also applicable to various research experiments and is highly versatile.

[0005] To achieve the main objective of this invention, a teaching and research experimental device is provided, comprising a support plate, an aquarium, a gas collection cover, a light source, a carbon dioxide generator, and a gas collection bottle. The bottom wall of the aquarium is detachably mounted on the support plate. A cavity is formed between the transparent, light-transmitting peripheral wall of the aquarium and the bottom wall, which is used to hold water and algae. The light source is detachably mounted on the support plate and can illuminate the cavity. The carbon dioxide generator is detachably mounted on the support plate, and its outlet can be inserted into the water in the cavity. The gas collection cover is a pyramidal dome, with its large-diameter end facing downwards, detachably passing through the top opening of the cavity and submerged in the water. The small-diameter conical end of the pyramidal dome has a through-hole for gas discharge, and the outer periphery of the gas discharge is convex. The system is equipped with a connected exhaust channel. The gas collecting bottle is detachably mounted on the support plate. The gas collecting bottle includes a transparent bottle body, a bottle cap, a first hose, a second hose, a first disconnect clamp, and a second disconnect clamp. The bottle cap is detachably fitted onto the mouth of the transparent bottle body to form a sealed cavity with the transparent bottle body. The sealed cavity can be filled with water. The outer peripheral wall of the transparent bottle body can be squeezed and elastically deformed. The first port of the first hose and the first port of the second hose pass through the bottle cap and can be connected to the sealed cavity. The second port of the first hose is detachably sleeved and connected to the exhaust channel. The second port of the second hose can draw in clear limewater. The first disconnect clamp is mounted on the first hose and controls the connection or disconnection of the two ports of the first hose. The second disconnect clamp is mounted on the second hose and controls the connection or disconnection of the two ports of the second hose.

[0006] In the experimental setup for teaching and research purposes, this invention, during the experiment to verify the release of oxygen during photosynthesis, involves an aquarium containing water and algae, and a gas collecting bottle filled with water. At this point, a first disconnect clamp connects both ends of the first flexible tube, and a second disconnect clamp connects both ends of the second flexible tube. Because the outer wall of the transparent gas collecting bottle is elastically deformable, the air in the sealed cavity, the first flexible tube, and the second flexible tube is expelled by squeezing the transparent body of the gas collecting bottle. Then, the first disconnect clamp disconnects both ends of the first flexible tube, and the second disconnect clamp disconnects both ends of the second flexible tube. Next, a light source is turned on to illuminate the aquarium's containing cavity. The outlet of a carbon dioxide generator is inserted into the water in the aquarium's containing cavity to supply a certain amount of carbon dioxide. Finally, the pyramidal gas collecting cover is closed. The entire structure is submerged and covered in water within the containment chamber. After the gas inside the pyramidal cover is expelled, the large-diameter end of the pyramidal cover remains submerged and covered in water within the containment chamber. When the exhaust channel at the small-diameter cone end of the pyramidal cover is below the water surface in the containment chamber, the second port of the first flexible tube of the pre-emptively purged gas collecting bottle is connected to the exhaust channel. Then, the first disconnect clamp controls the two ports of the first flexible tube to be connected, while the second disconnect clamp controls the two ports of the second flexible tube to remain disconnected. By squeezing the transparent body of the gas collecting bottle, the water inside the sealed chamber of the gas collecting bottle is discharged into the water within the containment chamber of the aquarium through the first flexible tube due to the squeezing of the transparent body. As a result, the oxygen released by the photosynthesis of algae plants accumulates at the small-diameter cone end of the pyramidal cover and enters the sealed chamber of the gas collecting bottle through the first flexible tube. To verify that the air released by algae during photosynthesis is oxygen, the first and second tubing are disconnected. The cap of the gas collecting bottle is then opened, and a glowing splint or incense stick is inserted into the transparent body of the bottle. The presence or re-ignition of the glowing splint or incense stick is observed. If it reignites, it indicates that the algae have produced oxygen through photosynthesis. Because the air between the pyramidal cover and the water in the containing chamber is purged before collecting the oxygen, and the air in the sealed cavity of the gas collecting bottle, as well as the first and second tubing, is also purged, the oxygen collected in the sealed cavity of the gas collecting bottle is more pure, resulting in high-purity oxygen. This high-purity oxygen can be used to verify that the air released by algae during photosynthesis is indeed oxygen, and is also applicable to chemical reaction experiments related to oxygen, such as charcoal combustion, sulfur combustion, iron wire combustion, phosphorus combustion, and magnesium combustion. Meanwhile, the transparent body of the gas collecting bottle of this invention allows for a direct and visual demonstration of the constantly changing ratio of oxygen collected in the sealed cavity to water within the cavity. This provides a clear and visual demonstration of the rate and volume change of oxygen production during photosynthesis, facilitating student comprehension. Furthermore, the teaching and research experimental device of this invention is equipped with a light source and a carbon dioxide generator, allowing for experiments that can be conducted anywhere, at any time, and are simple to operate. Teachers and students can then conduct experiments independently in various locations such as at home, in classrooms, or in laboratories.

[0007] In the teaching and research experimental device of this invention, during the experiment on the effect of different light intensities on photosynthesis, based on the above-mentioned experiment to test the release of oxygen during photosynthesis, the device controls and adjusts the light intensity of the light source. Under different light intensities, the device observes the rate of change of the ratio of oxygen collected in the sealed cavity of the gas collecting bottle to water in the sealed cavity of the gas collecting bottle, thus visually demonstrating the effect of different light intensities on photosynthesis.

[0008] In the experimental teaching and research device of this invention, during the experiment of releasing carbon dioxide through plant respiration, based on the above-mentioned experiment of releasing oxygen through photosynthesis, the light source is turned off to simulate the gas produced by algae at night. This gas is collected into the sealed cavity of the gas collecting bottle. Then, the gas collecting bottle is inverted, and the two ends of the second flexible tube are connected by the second on / off clamp. The transparent bottle body is squeezed so that the second flexible tube draws clear limewater into the sealed cavity of the gas collecting bottle. Then, the flexible tube is disconnected, and the gas collecting bottle is shaken. If obvious white turbidity appears, it indicates that the algae release carbon dioxide through respiration at night.

[0009] The algae in the aquarium of this invention's teaching and research experimental device can be sustainably cultivated. It serves as a teaching aid when experiments are needed and as an ornamental aquarium when not in use, offering high flexibility. Therefore, this teaching and research experimental device eliminates the limitations of location and time, enabling the rapid collection of high-purity oxygen produced by photosynthesis for experiments involving oxygen-related chemical reactions. It also provides a direct and visual demonstration of the rate and volume change of oxygen production during photosynthesis, facilitating student understanding. Furthermore, the experimental operation is simple and convenient, with no location restrictions; teachers and students can conduct experiments independently at home, in classrooms, laboratories, or other locations. It is also suitable for various in-depth research experiments, demonstrating strong versatility.

[0010] A further option is that the teaching and research experimental device also includes a transparent test tube, which is detachably mounted on the support plate. The tube can be filled with water, and the open end of the tube can be inverted and fitted around the outer periphery of the exhaust channel and immersed in the water in the receiving cavity. The outer periphery of the transparent test tube is provided with graduation lines; and / or, the outer periphery of the transparent bottle is provided with graduation lines.

[0011] A further option is that the teaching and research experimental device also includes a clamping mechanism, which includes a support rod, a first clamp, a second clamp, and an adjustment component. The support rod is detachably rotatable and supported on a support plate in a vertical direction. The first and second clamps are mounted on the support rod. The adjustment component can control the first and second clamps to move toward or away from each other. A transparent test tube, which is inverted and fitted at the exhaust channel, passes through the clamping hole formed between the first and second clamps.

[0012] A further option is to provide a first storage tank, a second storage tank, and a third storage tank on the support plate. The carbon dioxide generator can be placed in the first storage tank, the gas collecting bottle can be placed in the second storage tank, and the transparent test tube can be placed in the third storage tank.

[0013] A further embodiment is that the carbon dioxide generator includes a reaction flask, a cap, a fine-tuning valve, a third hose, and a gas atomizer. The cap is detachably fitted onto the mouth of the reaction flask and forms a reaction chamber with the reaction flask. The reaction chamber is used to contain the reactants that generate carbon dioxide. The inlet of the fine-tuning valve passes through the cap and can be connected to the reaction chamber. The first port of the third hose is connected to the outlet of the fine-tuning valve. The gas atomizer is connected to the second port of the third hose and can be inserted into the water in the containment chamber.

[0014] A further embodiment includes a check valve in the carbon dioxide generator. The check valve comprises a valve sleeve and a valve core, the valve core being movably disposed within the sleeve of the valve sleeve. A first through hole communicating with the sleeve is provided on the first end face of the valve sleeve, and a second through hole communicating with the sleeve is provided on the second end face of the valve sleeve. The third hose comprises a first section and a second section. The two ends of the first section are connected between the outlet of the fine-tuning valve and the first through hole, and the two ends of the second section are connected between the second through hole and the gas refiner. The first end face of the valve core can abut against the first end face of the valve sleeve to seal the first through hole. The second end face of the valve core has a notch, which connects the first through hole and the second through hole when the second end face of the valve core abuts against the second end face of the valve sleeve. And / or, the carbon dioxide generator further includes a pressure relief valve, the inlet of which passes through the cover and is connected to the reaction chamber. And / or, the carbon dioxide generator further includes a pressure gauge, the detection port of which passes through the cover and is connected to the reaction chamber.

[0015] A further embodiment of the teaching and research experimental device includes a carbon dioxide monitor, which comprises a suction cup and a transparent monitoring bottle. The inner cavity of the transparent monitoring bottle includes a liquid inlet channel, a curved channel, and a liquid storage cavity connected in sequence. The end of the liquid inlet channel away from the curved channel has a liquid inlet. The liquid storage cavity is used to contain the carbon dioxide monitoring liquid. A mounting post is protruding from the outer circumferential surface of the transparent monitoring bottle corresponding to the liquid inlet channel. The mounting post can be inserted into the mounting hole of the suction cup, and the suction cup can be adsorbed onto the inner circumferential surface of the transparent light-transmitting peripheral wall so that the transparent monitoring bottle is immersed in the water in the storage cavity; and / or, the teaching and research experimental device also includes a pH meter, which is detachably mounted. The first switch clamp has a first clamping plate with a first connecting hole and a first clamping hole, the maximum diameter of the first clamping hole being smaller than the minimum diameter of the first connecting hole. The first hose is in a connected state when passing through the first connecting hole and in a disconnected state when passing through the first clamping hole. The second switch clamp has a second clamping plate with a second connecting hole and a second clamping hole, the maximum diameter of the second clamping hole being smaller than the minimum diameter of the second connecting hole. The second hose is in a connected state when passing through the second connecting hole and in a disconnected state when passing through the second clamping hole.

[0016] A further option is to use a lamp as the light source, which is located vertically above the aquarium. The lamp's mounting rod can be rotatably supported on a support plate, and the lamp's light intensity is adjustable. Alternatively, the light source can be a flexible LED strip, which is wrapped around the outer surface of a transparent, light-transmitting wall, and the light intensity of the flexible LED strip is adjustable.

[0017] A further option is to use lamps as the light source, and the teaching and research experimental device also includes transparent light-transmitting plates of different colors, which can be detachably placed at the top opening of the receiving cavity.

[0018] A further embodiment is that the teaching and research experimental device also includes a carrying bag, which includes a supporting bottom wall, a first side wall, a second side wall, a third side wall, a fourth side wall, and two handles. A support plate is fixedly installed on the supporting bottom wall. The first, second, third, and fourth side walls are all made of flexible material and are sequentially connected to the four sides of the supporting bottom wall. The two handles protrude from the supporting bottom wall and are respectively installed on the first and third side walls. The first side wall is detachably connected to the second and fourth side walls by Velcro, and the third side wall is detachably connected to the second and fourth side walls by Velcro. Attached Figure Description

[0019] Figure 1 This is a first-view structural diagram of the bag in the enclosed state in the first embodiment of the teaching and research experimental device of the present invention.

[0020] Figure 2 This is a second-view structural diagram of the bag in the enclosed state in the first embodiment of the teaching and research experimental device of the present invention.

[0021] Figure 3 This is a first-view structural diagram of the bag in the unfolded state in the first embodiment of the teaching and research experimental device of the present invention.

[0022] Figure 4 This is a second-view structural diagram of the bag in the unfolded state in the first embodiment of the teaching and research experimental device of the present invention.

[0023] Figure 5 This is a diagram showing the unfolded structure of the bag in the first embodiment of the teaching and research experimental device of the present invention.

[0024] Figure 6 This is a partial structural diagram from a first perspective of the first embodiment of the teaching and research experimental device of the present invention.

[0025] Figure 7 This is a partial structural diagram from a second perspective of the first embodiment of the teaching and research experimental device of the present invention.

[0026] Figure 8 This is an exploded view of the structure of the aquarium, gas collection cover, and carbon dioxide monitor in the first embodiment of the teaching and research experimental device of the present invention.

[0027] Figure 9 This is a cross-sectional view of the structure of the aquarium, the gas collection cover, and the carbon dioxide monitor in the first embodiment of the teaching and research experimental device of the present invention.

[0028] Figure 10 This is a front view of the carbon dioxide monitor in the first embodiment of the teaching and research experimental device of the present invention.

[0029] Figure 11 This is an exploded view of the carbon dioxide monitor in the first embodiment of the teaching and research experimental device of the present invention.

[0030] Figure 12 This is an exploded view of the structure of the carbon dioxide generator, gas collecting bottle, and transparent test tube in the first embodiment of the teaching and research experimental device of the present invention.

[0031] Figure 13 This is a structural diagram of the first on / off clamp / second on / off clamp in the first embodiment of the teaching and research experimental device of the present invention.

[0032] Figure 14 This is a cross-sectional view of the check valve in the first embodiment of the teaching and research experimental device of the present invention.

[0033] Figure 15This is a structural diagram of the lamp, clamping mechanism, transparent test tube, gas collection cover and aquarium in the first embodiment of the teaching and research experimental device of the present invention.

[0034] Figure 16 This is a structural diagram of the clamping mechanism in the first embodiment of the teaching and research experimental device of the present invention.

[0035] Figure 17 This is a structural diagram of the lamp, transparent light-transmitting plate, air collection cover, and aquarium in the first embodiment of the teaching and research experimental device of the present invention.

[0036] Figure 18 This is a partial structural diagram of the second embodiment of the teaching and research experimental device of the present invention.

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0038] First embodiment of teaching and research experimental device:

[0039] See Figures 1 to 17This embodiment discloses a teaching and research experimental device 10, including a support plate 110, an aquarium 13, an air collection cover 14, a light source, a carbon dioxide generator 17, and an air collection bottle 16. The bottom wall of the aquarium 13 is detachably mounted on the support plate 110. The transparent light-transmitting peripheral wall of the aquarium 13 and the bottom wall form a receiving cavity 131, which is used to hold water and algae. The light source is detachably mounted on the support plate 110 and can irradiate the receiving cavity 131. The carbon dioxide generator 17 is detachably mounted on the support plate 110, and the gas outlet of the carbon dioxide generator 17 can be inserted into the water in the receiving cavity 131. In this embodiment, the gas collection cover 14 is a pyramidal cover. The large-diameter end of the pyramidal cover 14 is detachably passed through the top opening of the receiving cavity 131 and can be submerged and covered in the water of the receiving cavity 131. The small-diameter cone end of the pyramidal cover 14 is provided with an air outlet. The outer periphery of the air outlet is provided with a connected exhaust channel 141. Furthermore, in this embodiment, the gas collecting bottle 16 is detachably mounted on the support plate 110. The gas collecting bottle 16 includes a transparent bottle body 161, a bottle cap 162, a first flexible tube 163, a second flexible tube 165, a first disconnect clamp 164, and a second disconnect clamp 166. The bottle cap 162 is detachably fitted onto the mouth of the transparent bottle body 161 and forms a sealed cavity with the transparent bottle body 161. The sealed cavity can be filled with water. The outer peripheral wall of the transparent bottle body 161 can be squeezed and elastically deformed. The first port of the first flexible tube 163 and the first port of the second flexible tube 165 pass through the bottle cap 162 and can be connected to the sealed cavity. The second port of the first flexible tube 163 is detachably sleeved and connected to the exhaust channel 141. The second port of the second flexible tube 165 can draw in clear limewater. The first disconnect clamp 164 is mounted on the first flexible tube 163 and controls the connection or disconnection of the two ports of the first flexible tube 163. The second disconnect clamp 166 is mounted on the second flexible tube 165 and controls the connection or disconnection of the two ports of the second flexible tube 165.

[0040] In this embodiment, during the experiment of verifying the release of oxygen through photosynthesis, the teaching and research experimental device 10 contains water and algae in the containment cavity 131 of the aquarium 13, and the sealed cavity of the gas collecting bottle 16 is filled with water. At this time, the first disconnect clamp 164 controls the two ends of the first hose 163 to be connected, and the second disconnect clamp 166 controls the two ends of the second hose 165 to be connected. Since the outer peripheral wall of the transparent bottle body 161 of the gas collecting bottle 16 can be squeezed and elastically deformed, the air in the sealed cavity of the gas collecting bottle 16, the first hose 163, and the second hose 165 are expelled by squeezing the transparent bottle body 161 of the gas collecting bottle 16. Then, the first disconnect clamp 164 controls the two ends of the first hose 163 to be disconnected, and the second disconnect clamp 166 controls the two ends of the second hose 165 to be disconnected. Then, the light source is turned on to irradiate the containment cavity 131 of the aquarium 13, and the gas outlet of the carbon dioxide generator 17 is inserted into the water in the containment cavity 131 of the aquarium 13 to supply carbon dioxide. After that, the pyramidal cover 14 is closed. The entire structure is submerged and covered in the water of the receiving cavity 131. After the gas inside the prism-shaped gas collection cover 14 is discharged, the large-diameter end of the prism-shaped gas collection cover 14 remains submerged and covered in the water of the receiving cavity 131. When the exhaust channel 141 at the small-diameter conical end of the prism-shaped gas collection cover 14 is lower than the water surface of the receiving cavity 131, the second end of the first flexible tube 163 of the pre-emptively purged gas collection bottle 16 is connected to the exhaust channel 141. Then, the first on / off clamp 164 controls the first flexible tube 163. When the two ends of 63 are connected, the second disconnect clamp 166 keeps the two ends of the second hose 165 disconnected. By squeezing the transparent body 161 of the gas collecting bottle 16, the water in the sealed cavity of the gas collecting bottle 16 is discharged into the water in the receiving cavity 131 of the aquarium 13 through the first hose 163 due to the squeezing of the transparent body 161. Thus, the oxygen released by the photosynthesis of algae accumulates at the small-diameter cone end of the pyramidal cover 14 and enters the sealed cavity of the gas collecting bottle 16 through the first hose 163. To verify that the air released by the photosynthesis of algae is oxygen, first disconnect the first hose 163 and the second hose 165, then open the cap 162 of the gas collecting bottle 16, insert a glowing splint or incense stick into the transparent body 161 of the gas collecting bottle 16, and observe whether the glowing splint or incense stick reignites. If it reignites, it means that the algae have produced oxygen through photosynthesis. Before collecting the oxygen released by algae photosynthesis, the air between the pyramidal cover 14 and the water in the containment cavity 131 is completely purged, and the air in the sealed cavity of the gas collecting bottle 16, the first hose 163, and the second hose 165 is also purged. This results in the oxygen released by algae photosynthesis being collected in the sealed cavity of the gas collecting bottle 16 being purer, thus obtaining high-purity oxygen. This high-purity oxygen can be used to verify that the air released by algae photosynthesis is oxygen, and it is also applicable to chemical reaction experiments related to oxygen, such as charcoal combustion, sulfur combustion, iron wire combustion, phosphorus combustion, magnesium combustion, and other chemical experiments.Meanwhile, the transparent body 161 of the gas collecting bottle 16 in this embodiment allows for a direct and visual observation of the continuous change in the ratio of oxygen collected in the sealed cavity to water within the sealed cavity. This provides a direct and visual demonstration of the rate and volume change of oxygen production during photosynthesis, which is beneficial for student understanding. Furthermore, the teaching and research experimental device 10 in this embodiment is equipped with a light source and a carbon dioxide generator 17, allowing for experiments that are not limited by location or time and are simple to perform. Teachers and students can conduct experiments independently in different locations such as at home, in classrooms, or in laboratories.

[0041] In this embodiment, the teaching and research experimental device 10, during the experiment on the effect of different light intensities on photosynthesis, based on the above-mentioned experiment to test the release of oxygen during photosynthesis, controls and adjusts the light intensity of the light source. Under different light intensities, the rate of change of the ratio of oxygen collected in the sealed cavity of the gas collecting bottle 16 to water in the sealed cavity of the gas collecting bottle 16 is observed, thus visually demonstrating the effect of different light intensities on photosynthesis.

[0042] In this embodiment, the teaching and research experimental device 10, during the experiment of releasing carbon dioxide through plant respiration, based on the above-mentioned experiment of releasing oxygen through photosynthesis, turns off the light source to simulate the gas produced by algae at night. The gas is collected into the sealed cavity of the gas collecting bottle 16. Then, the gas collecting bottle 16 is inverted, and the two ends of the second flexible tube 165 are connected by the second disconnect clamp 166. The transparent bottle body 161 is squeezed so that the second flexible tube 165 draws clear limewater into the sealed cavity of the gas collecting bottle 16. Then, the second flexible tube 165 is disconnected, and the gas collecting bottle 16 is shaken. If obvious white turbidity appears, it indicates that the algae release carbon dioxide through respiration at night.

[0043] In this embodiment, the algae in the aquarium 13 of the teaching and research experimental device 10 can be sustainably maintained. When experiments are needed, it serves as a teaching aid; when not conducting experiments, it functions as an ornamental aquarium 13, offering high flexibility. Therefore, this teaching and research experimental device 10 eliminates the limitations of location and time, enabling rapid collection of high-purity oxygen produced by photosynthesis for use in oxygen-related chemical reaction experiments. It also provides a direct and visual demonstration of the rate and volume change of oxygen production during photosynthesis, facilitating student understanding. Furthermore, the experimental operation is simple and convenient, with no location restrictions. Teachers and students can conduct experiments independently at home, in classrooms, laboratories, or other locations. It is also suitable for various research-based experimental demonstrations of varying depths, demonstrating strong versatility. Specifically, the outer circumference of the transparent body 161 of the gas collecting bottle 16 in this embodiment is marked with graduations, allowing the experimenter to easily read the volume of oxygen collected by the gas collecting bottle 16. Furthermore, in this embodiment, baffles 132 are protruding from the inner circumferential surfaces of the two opposite side walls of the transparent, light-transmitting perimeter wall of the aquarium 13. The large-diameter end of the pyramidal cover 14 abuts against the baffles 132 with its opening facing downwards. The baffles 132 are designed to limit the position of the pyramidal cover 14, thereby preventing damage to the algae when the entire pyramidal cover 14 is submerged and closed in the water of the containment cavity 131, ensuring the healthy growth of the algae for sustainable experimentation. In addition, to further enhance the visual appeal of the aquarium 13, a reflective film is attached to the transparent, light-transmitting perimeter wall on the back of the aquarium 13, which also improves the light utilization rate. In addition, to prevent the gas collected in the sealed cavity of the gas collecting bottle 16 from flowing back from the first hose 163 into the gas collecting cap 14, the gas collecting bottle 16 in this embodiment also includes a long strip tube. The first end of the long strip tube is connected to the first hose 163 at the bottle cap 162, and the second end of the long strip tube extends towards the bottom of the transparent bottle body 161 in the height direction. This allows the long strip tube to be inserted into the sealed cavity of the gas collecting bottle 16, so that the gas collected in the sealed cavity of the gas collecting bottle 16 can be prevented from flowing back from the first hose 163 into the gas collecting cap 14, regardless of whether the gas collecting bottle 16 is upright, inverted, or tilted, thereby improving the success rate of the experiment.

[0044] Combination Figure 12 and Figure 13In this embodiment, the first clamping plate 1641 of the first switch clamp 164 has a first connecting hole 1642 and a first clamping hole 1643 connected through it. The maximum diameter of the first clamping hole 1643 is smaller than the minimum diameter of the first connecting hole 1642. The first flexible tube 163 is in a connected state when passing through the first connecting hole 1642, and in a disconnected state when passing through the first clamping hole 1643. Similarly, in this embodiment, the second clamping plate 1661 of the second switch clamp 166 has a second connecting hole 1662 and a second clamping hole 1663 connected through it. The maximum diameter of the second clamping hole 1663 is smaller than the minimum diameter of the second connecting hole 1662. The second flexible tube 165 is in a connected state when passing through the second connecting hole 1662, and in a disconnected state when passing through the second clamping hole 1663. Therefore, the first disconnect clamp 164 and the second disconnect clamp 166 in this embodiment have a simple structure, and the connection and disconnection operations of the hose are simple and convenient. That is, simply moving the hose from the disconnection hole to the connection hole will connect the two ends of the hose, and moving the hose from the connection hole to the disconnection hole will disconnect the two ends of the hose. In addition, the first disconnect clamp 164 and the second disconnect clamp 166 can be electrically controlled on / off valves to control the connection or disconnection of the two ends of the hose.

[0045] Combination Figure 12 and Figure 14In this embodiment, the carbon dioxide generator 17 includes a reaction bottle 171, a cap 172, a fine-tuning valve 173, a third hose 177, and a gas atomizer 176. The cap 172 is detachably fitted onto the mouth of the reaction bottle 171 and forms a reaction chamber with the reaction bottle 171. The reaction chamber is used to contain the reactants that generate carbon dioxide. The air inlet of the fine-tuning valve 173 passes through the cap 172 and can be connected to the reaction chamber. The first port of the third hose 177 is connected to the air outlet of the fine-tuning valve 173. The gas atomizer 176 is connected to the second port of the third hose 177 and can be inserted into the water in the receiving chamber 131. The reactants that produce carbon dioxide can be yeast powder and white sugar fermentation, homemade fruit wine fermentation, enzyme fermentation, or a chemical reaction of baking soda and alum. The fine-tuning valve 173 is used to regulate the amount of carbon dioxide emitted. The fine-tuning plate 1761 of the gas aerator 176 can disperse carbon dioxide gas into very fine bubbles, increasing the contact area with water and accelerating the dissolution rate, thereby promoting the photosynthetic efficiency of algae in the containment chamber 131. In this embodiment, besides supplying carbon dioxide to the water in the containment chamber 131 of the aquarium 13, the carbon dioxide generator 17 can also be used for yeast fermentation experiments. The yeast fermentation reactants are placed in the reaction chamber of the reaction bottle 171, and the cap 172 is placed on the mouth of the reaction bottle 171. After a certain period of time, the fine-tuning valve 173 is opened to allow gas to pass into clear limewater. If a distinct white turbidity forms, it indicates that the yeast fermentation has produced carbon dioxide. The fine-tuning valve 173 has a wide and flexible flow control range, provides obvious experimental results, and is simple and convenient to operate. To further verify the production of alcohol by yeast fermentation, the carbon dioxide generator 17 in this embodiment also includes a pressure relief valve 175. The air inlet of the pressure relief valve 175 passes through the cover 172 and can be connected to the reaction chamber. By controlling the pressure relief valve 175, a small amount of high-pressure gas is ejected, and the alcohol odor quickly diffuses into the air, which can be smelled instantly by the experimenter. The experimental effect is obvious, and the operation is simple and convenient. Moreover, it can be repeated at any time, overcoming the long-standing problem that existing devices cannot be used for continuous teaching and have poor demonstration effects. The alcohol concentration of the fermentation reaction product can also be obtained by testing with an alcohol tester. In addition, the pressure relief valve 175 can release the gas pressure in the reaction chamber of the reaction bottle 171, avoiding the risk of explosion due to excessive gas pressure in the reaction chamber, thereby ensuring the safety of the experiment. In addition to supplying carbon dioxide to the water in the containment chamber 131 of the aquarium 13, the carbon dioxide generator 17 in this embodiment can also be used to conduct yeast fermentation experiments, thereby improving the versatility of the teaching and research experimental device 10.

[0046] To demonstrate the gas produced during fermentation and further ensure the safety of the experiment, the carbon dioxide generator 17 in this embodiment also includes a pressure gauge 174. The detection port of the pressure gauge 174 passes through the cover 172 and can be connected to the reaction chamber. The pressure gauge 174 is used to read the gas pressure in the reaction chamber. When the pressure is too high, it controls the pressure relief valve 175 to release the pressure, so that the experimenter can monitor the gas pressure in the reaction chamber in real time. To ensure the reliability and smoothness of carbon dioxide supply to the water in the containment chamber 131 of the aquarium 13, the carbon dioxide generator 17 in this embodiment also includes a check valve 178. The check valve 178 includes a valve sleeve 181 and a valve core 182. The valve core 182 is movably disposed within the sleeve 1811 of the valve sleeve 181. A first through hole 1812 communicating with the sleeve 1811 is opened through the first end face of the valve sleeve 181, and a second through hole 1813 communicating with the sleeve 1811 is opened through the second end face of the valve sleeve 181. The third hose 177 includes a first section 1771 and a second section 1772. The two ends of the first section 1771 are connected between the air outlet of the fine-tuning valve 173 and the first through hole 1812, and the second section 1772... The two ends of the valve core 182 are connected between the second through hole 1813 and the gas refiner 176. The first end face of the valve core 182 can abut against the first end face of the valve sleeve 181 to seal the first through hole 1812. The second end face of the valve core 182 has a notch 1821. When the second end face of the valve core 182 abuts against the second end face of the valve sleeve 181, the notch 1821 connects the first through hole 1812 and the second through hole 1813, so that the gas in the first pipe section 1771 can be smoothly discharged into the second pipe section 1772, while the gas or liquid in the second pipe section 1772 cannot be discharged into the first pipe section 1771, avoiding the backflow of gas or liquid, thereby improving the reliability and smoothness of carbon dioxide supply, and thus improving the accuracy of the experiment.

[0047] Combination Figures 8 to 11The teaching and research experimental device 10 in this embodiment also includes a carbon dioxide monitor 1101. The carbon dioxide monitor 1101 includes a suction cup 11011 and a transparent monitoring bottle 11012. The inner cavity of the transparent monitoring bottle 11012 includes a liquid inlet channel 11013, a curved channel 11014 and a liquid storage cavity 11015 connected in sequence. The end of the liquid inlet channel 11013 away from the curved channel 11014 has a liquid inlet 110131. The liquid storage cavity 11015 is used to contain carbon dioxide monitoring liquid. The outer peripheral surface of the transparent monitoring bottle 11012 corresponding to the liquid inlet channel 11013 is provided with a mounting post 11016. The mounting post 11016 can be inserted into the mounting hole 110111 of the suction cup 11011. The suction cup 11011 can be adsorbed on the inner peripheral surface of the transparent light-transmitting peripheral wall of the aquarium 13 so that the transparent monitoring bottle 11012 is immersed in the water in the receiving cavity 131. The experimenter positioned the transparent monitoring bottle 11012 with the inlet 110131 facing upwards and dripped carbon dioxide monitoring solution into it. The transparent monitoring bottle 11012 was then rotated so that the inlet 110131 faced downwards. The carbon dioxide monitoring solution then flowed sequentially through the inlet channel 11013 and the curved channel 11014, ultimately being stored in the storage chamber 11015. Due to the curved channel 11014, when the inlet 110131 of the transparent monitoring bottle 11012 was facing downwards, the carbon dioxide monitoring solution stored in the storage chamber 11015 could not flow back out, thus ensuring that the carbon dioxide monitoring solution was stably maintained within the storage chamber 11015 at one end of the curved channel 11014. Then, the mounting post 11016 of the transparent monitoring bottle 11012 is inserted into the mounting hole 110111 of the suction cup 11011. The suction cup 11011 is then attached to the inner circumferential surface of the transparent, light-transmitting peripheral wall, immersing the transparent monitoring bottle 11012 in the water of the receiving chamber 131. Carbon dioxide gas in the water of the receiving chamber 131 enters the inner cavity of the transparent monitoring bottle 11012. Since the carbon dioxide monitoring liquid changes color according to the concentration of carbon dioxide gas, it displays blue when the concentration is low, green when the concentration is moderate, and yellow when the concentration is high. Thus, the experimenter can determine whether the concentration of carbon dioxide gas supplied to the receiving chamber 131 by the carbon dioxide generator 17 is appropriate, or whether algae release carbon dioxide during nighttime respiration. The transparent monitoring bottle 11012 provides a direct and visual demonstration of the carbon dioxide monitoring liquid's color, facilitating direct observation by the experimenter.Specifically, in this embodiment, the liquid inlet channel 11013 of the transparent monitoring bottle 11012 extends in a funnel shape, and the liquid inlet 110131 is at the maximum funnel opening of the funnel-shaped liquid inlet channel 11013, thereby facilitating the dripping of carbon dioxide monitoring liquid. In this embodiment, the liquid storage cavity 11015 of the transparent monitoring bottle 11012 is spherically shaped, thereby improving the appearance and stability of the liquid storage of the transparent monitoring bottle 11012. In addition, in this embodiment, the liquid inlet channel 11013 of the transparent monitoring bottle 11012 can extend in a cylindrical shape, and the liquid storage cavity 11015 of the transparent monitoring bottle 11012 can also extend in a cylindrical shape.

[0048] In order to monitor the pH of the water in the containment cavity 131 in real time, the teaching and research experimental device 10 in this embodiment also includes a pH meter, which is detachably mounted on the support plate 110 and used to detect the pH of the water in the containment cavity 131.

[0049] To further expand its versatility, the teaching and research experimental device 10 in this embodiment also includes a transparent test tube 18. The transparent test tube 18 is detachably mounted on the support plate 110. The cavity of the transparent test tube 18 can be filled with water, and the open end of the cavity of the transparent test tube 18 can be upside down and fitted around the outer periphery of the exhaust channel 141 and immersed in the water in the receiving cavity 131. The outer periphery of the transparent test tube 18 is provided with graduation lines, so as to collect the oxygen released by the photosynthesis of algae into the transparent test tube 18.

[0050] Combination Figure 15 and Figure 16The teaching and research experimental device 10 in this embodiment also includes a clamping mechanism 15. The clamping mechanism 15 includes a support rod 151, a first clamp 154, a second clamp 155, and an adjustment component. The support rod 151 is detachably rotatably supported on the support plate 110 in a vertical direction. The first clamp 154 ​​and the second clamp 155 are disposed on the support rod 151. The adjustment component can control the first clamp 154 ​​and the second clamp 155 to move toward or away from each other. The transparent test tube 18, which is upside down and sleeved in the exhaust channel 141, passes through the clamping hole formed between the first clamp 154 ​​and the second clamp 155. Thus, the first clamp 154 ​​and the second clamp 155 clamp the transparent test tube 18, which is upside down and sleeved in the exhaust channel 141, without the experimenter having to hold the transparent test tube 18 all the time, reducing the experimenter's experimental operation intensity. Specifically, the adjustment assembly in this embodiment includes a hinge rod 156, a hinge shaft 157, a threaded rod 158, and two wing nuts 159. The connecting end of the first gripper 154 is hinged to the first end of the hinge rod 156, and the connecting end of the second gripper 155 is hinged to the second end of the hinge rod 156 via the hinge shaft 157. The threaded rod 158 passes sequentially through the connecting end of the first gripper 154, the connecting end of the second gripper 155, and the support rod 151, and the hinge shaft 157 passes through the threaded rod 158. A wing nut 159 is threaded onto the first end of the threaded rod 158 and abuts against the connecting end of the first jaw 154. Another wing nut 159 is threaded onto the second end of the threaded rod 158 and abuts against the end face of the second jaw 155 on the support rod 151 away from the wing nut 159. The second jaw 155 abuts against the end face of the support rod 151 away from the wing nut 159. Thus, by rotating and adjusting the two wing nuts 159, the first jaw 154 and the second jaw 155 can be forced to move toward or away from each other. Alternatively, the adjusting component in this embodiment can also be a jaw cylinder, which can electrically control the movement of the first jaw 154 and the second jaw 155 toward or away from each other.

[0051] To facilitate the storage of experimental instruments, the support plate 110 in this embodiment is provided with a first storage compartment 193, a second storage compartment 191, and a third storage compartment 192. The carbon dioxide generator 17 can be placed in the first storage compartment 193, the gas collecting bottle 16 can be placed inside a beaker and then placed in the second storage compartment 191, and the transparent test tube 18 can be placed in the third storage compartment 192. Specifically, in this embodiment, the first storage compartment 193, the second storage compartment 191, and the third storage compartment 192 are combined to form a storage structure 19. The storage structure 19 and the support plate 110 are two separate components. The storage structure 19 can be installed on the support plate 110 by adhesive fixing or by screw detachment. The first storage compartment 193, the second storage compartment 191, and the third storage compartment 192 can also be structural features fixedly installed on the support plate 110, in which case the first storage compartment 193, the second storage compartment 191, and the third storage compartment 192 are part of the support plate 110.

[0052] Specifically, in this embodiment, the light source is a lamp 12, which is located vertically above the aquarium 13. The mounting rod 121 of the lamp 12 is rotatably supported on the support plate 110, and the light intensity of the lamp 12 is adjustable. In this embodiment, the mounting rod 121 of the lamp 12 is rotatably supported on the support plate 110 via a rotary bearing 122. Further, in this embodiment, one end of the support rod 151 of the holding mechanism has a slot 152, which rotatably engages with the outer peripheral wall of the vertical rod of the mounting rod 121. The threaded section of the tightening bolt 153 passes through the peripheral wall of the slot 152 and presses against the vertical rod of the mounting rod 121, thereby fixing the support rod 151 to the vertical rod of the mounting rod 121.

[0053] Combination Figure 17 The teaching and research experimental device 10 in this embodiment also includes transparent light-transmitting plates 1102 of different colors. The transparent light-transmitting plates 1102 are detachably placed at the top opening of the receiving cavity 131 of the aquarium 13, thereby verifying the effect of different light colors on photosynthesis. The transparent light-transmitting plates 1102 can be transparent light-transmitting plates of colors such as red, purple, blue, and green, thereby further expanding the versatility.

[0054] Combination Figures 1 to 5 The teaching and research experimental device 10 in this embodiment also includes a carrying bag 11. The carrying bag 11 includes a supporting bottom wall 116, a first side wall 111, a second side wall 112, a third side wall 113, a fourth side wall 115, and two handles 114. A support plate 110 is fixedly installed on the supporting bottom wall 116. The first side wall 111, the second side wall 112, the third side wall 113, and the fourth side wall 115 are all made of flexible material and are sequentially connected to the four sides of the supporting bottom wall 116. The two handles 114 protrude from the supporting bottom wall 116 and are respectively installed on the first side wall 111 and the third side wall 113. The first side wall 111 is detachably connected between the second side wall 112 and the fourth side wall 115 by Velcro 117, and the third side wall 113 is detachably connected between the second side wall 112 and the fourth side wall 115 by Velcro 117. When experiments are needed or for viewing in the aquarium 13, the Velcro 117 fastening the first sidewall 111, second sidewall 112, third sidewall 113, and fourth sidewall 115 of the carrying bag 11 separates, allowing the first sidewall 111, second sidewall 112, third sidewall 113, and fourth sidewall 115 of the carrying bag 11 to unfold and open along the four perimeter of the supporting base wall 116 (as shown). Figures 3 to 5As shown), when it is necessary to move the teaching and research experimental device 10, the Velcro 117 between the first sidewall 111, the second sidewall 112, the third sidewall 113, and the fourth sidewall 115 of the carrying bag 11 is fastened, so that the first sidewall 111, the second sidewall 112, the third sidewall 113, and the fourth sidewall 115 surround and cover the relevant experimental instruments (such as...). Figure 1 and Figure 2 As shown), the two handles 114 of the bag 11 can be used to move the entire teaching and research experimental device 10, making the teaching and research experimental device 10 easy and quick to move. Moreover, at least the first side wall 111, the second side wall 112, the third side wall 113, and the fourth side wall 115 of the bag 11 are made of absorbent fabric, which can absorb the water brought out during the experimental operation or movement in time. It is easy to carry, beautiful and practical.

[0055] Furthermore, in this embodiment, the bottom wall of the aquarium 13 of the teaching and research experimental device 10 is detachably mounted on the support plate 110 by screws, which facilitates the disassembly, cleaning and water change of the aquarium 13. In this embodiment, the support plate 110 is fixed to the supporting bottom wall 116 of the bag 11 by adhesive, or the support plate 110 is placed on the supporting bottom wall 116 of the bag 11 by detachment, which facilitates the cleaning of the bag 11.

[0056] Second embodiment of the teaching and research experimental device:

[0057] As an explanation of the second embodiment of the teaching and research experimental device of the present invention, the following description only focuses on the differences from the first embodiment of the teaching and research experimental device.

[0058] See Figure 18 In this embodiment, the light source is a flexible light strip 1103, which is wrapped around the outer periphery of the transparent, light-transmitting wall of the aquarium 13. The light intensity of the flexible light strip 1103 is adjustable. The flexible light strip 1103, wrapped around the outer periphery of the transparent, light-transmitting wall of the aquarium 13, concentrates the light onto the containment cavity 131, thus better promoting the photosynthetic efficiency of algae. Different colored flexible light strips 1103 can be used to verify the effect of different light colors on photosynthesis.

[0059] To further enhance the visual appeal of the aquarium 13, a reflective film is affixed to the transparent, light-transmitting perimeter wall on the back of the aquarium 13, improving light utilization and eliminating the need for the flexible light strip 1103 to be wrapped around the transparent, light-transmitting perimeter wall where the reflective film is located. To further increase light intensity, this embodiment uses at least two flexible light strips 1103, which are arranged side-by-side vertically on the transparent, light-transmitting perimeter wall of the aquarium 13 and connected in series.

[0060] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included in the scope of the present invention patent application.

Claims

1. A teaching and research experimental device, comprising a support plate, an aquarium, an air collection cover, a light source, a carbon dioxide generator, and an air collection bottle, wherein the bottom wall of the aquarium is detachably mounted on the support plate, and a cavity is formed between the transparent, light-transmitting peripheral wall of the aquarium and the bottom wall, the cavity being used to hold water and algae, the light source being detachably mounted on the support plate and capable of illuminating the cavity, and the carbon dioxide generator being detachably mounted on the support plate, with its outlet end capable of being inserted into the water within the cavity, characterized in that: The gas collection cover is a pyramidal cover. The large-diameter end of the pyramidal cover is detachably passed through the top opening of the receiving cavity and can be immersed and covered in the water in the receiving cavity. The small-diameter cone end of the pyramidal cover is provided with a gas outlet. The outer periphery of the gas outlet is provided with a connected exhaust channel. The gas collecting bottle is detachably mounted on the support plate. The gas collecting bottle includes a transparent bottle body, a bottle cap, a first hose, a second hose, a first disconnect clamp, and a second disconnect clamp. The bottle cap is detachably fitted onto the mouth of the transparent bottle body and forms a sealed cavity with the transparent bottle body. The sealed cavity can be filled with water. The outer peripheral wall of the transparent bottle body can be squeezed and elastically deformed. The first port of the first hose and the first port of the second hose pass through the bottle cap and can be connected to the sealed cavity. The second port of the first hose is detachably sleeved and connected to the exhaust channel. The second port of the second hose can draw in clear limewater. The first disconnect clamp is mounted on the first hose and controls the connection or disconnection of the two ports of the first hose. The second disconnect clamp is mounted on the second hose and controls the connection or disconnection of the two ports of the second hose. The teaching and research experimental device also includes a carbon dioxide monitor, which includes a suction cup and a transparent monitoring bottle. The inner cavity of the transparent monitoring bottle includes a liquid inlet channel, a curved channel, and a liquid storage cavity connected in sequence. The end of the liquid inlet channel away from the curved channel has a liquid inlet. The liquid storage cavity is used to contain carbon dioxide monitoring liquid. The outer peripheral surface of the transparent monitoring bottle corresponding to the liquid inlet channel is provided with a mounting post. The mounting post can be inserted into the mounting hole of the suction cup. The suction cup can be adsorbed on the inner peripheral surface of the transparent light-transmitting peripheral wall so that the transparent monitoring bottle is immersed in the water in the containing cavity. The liquid inlet channel extends in a funnel shape, and the liquid inlet is at the position of the largest funnel opening. The liquid storage cavity is spherically shaped.

2. The teaching and research experimental device according to claim 1, characterized in that: The teaching and research experimental device also includes a transparent test tube, which is detachably mounted on the support plate. The tube can be filled with water, and the open end of the tube can be upside down and fitted around the outer periphery of the exhaust channel and immersed in the water in the receiving cavity. The outer periphery of the transparent test tube is provided with scale lines. And / or, the outer circumferential surface of the transparent bottle is provided with scale lines.

3. The teaching and research experimental device according to claim 2, characterized in that: The teaching and research experimental device also includes a clamping mechanism, which includes a support rod, a first clamp, a second clamp, and an adjustment component. The support rod is detachably rotatably supported on the support plate in a vertical direction. The first clamp and the second clamp are disposed on the support rod. The adjustment component can control the first clamp and the second clamp to move toward or away from each other. The transparent test tube, which is upside down and sleeved at the exhaust channel, passes through the clamping hole formed between the first clamp and the second clamp.

4. The teaching and research experimental device according to claim 2, characterized in that: The support plate is provided with a first storage tank, a second storage tank and a third storage tank. The carbon dioxide generator can be placed in the first storage tank, the gas collecting bottle can be placed in the second storage tank and the transparent test tube can be placed in the third storage tank.

5. The teaching and research experimental device according to claim 1, characterized in that: The carbon dioxide generator includes a reaction bottle, a cap, a fine-tuning valve, a third hose, and a gas refiner. The cap is detachably fitted onto the mouth of the reaction bottle and forms a reaction chamber with the reaction bottle. The reaction chamber is used to contain the reactants that generate carbon dioxide. The air inlet of the fine-tuning valve passes through the cover and can be connected to the reaction chamber. The first port of the third hose is connected to the air outlet of the fine-tuning valve. The gas atomizer is connected to the second port of the third hose and can be inserted into the water in the receiving chamber.

6. The teaching and research experimental device according to claim 5, characterized in that: The carbon dioxide generator also includes a check valve, which includes a valve sleeve and a valve core. The valve core is movably disposed within the sleeve of the valve sleeve. A first through hole communicating with the sleeve is opened through the first end face of the valve sleeve, and a second through hole communicating with the sleeve is opened through the second end face of the valve sleeve. The third hose includes a first section and a second section. The two ends of the first section are connected between the outlet of the fine-tuning valve and the first through hole, and the two ends of the second section are connected between the second through hole and the gas refiner. The first end face of the valve core can abut against the first end face of the valve sleeve to seal the first through hole. The second end face of the valve core has a notch. When the second end face of the valve core abuts against the second end face of the valve sleeve, the notch connects the first through hole and the second through hole. And / or, the carbon dioxide generator further includes a pressure relief valve, the inlet of which passes through the cover and is connected to the reaction chamber; And / or, the carbon dioxide generator further includes a pressure gauge, the detection port of which passes through the cover and is in communication with the reaction chamber.

7. The teaching and research experimental device according to claim 1, characterized in that: The teaching and research experimental device also includes a pH meter, which is detachably mounted on the support plate and used to detect the acidity or alkalinity of the water in the containment cavity; And / or, the first clamping plate of the first switch clamp is provided with a first connecting hole and a first clamping hole, the maximum diameter of the first clamping hole is smaller than the minimum diameter of the first connecting hole, the first hose is in the connected state when passing through the first connecting hole, and in the disconnected state when passing through the first clamping hole. And / or, the second clamping plate of the second switch clamp is provided with a second connecting hole and a second clamping hole, the maximum diameter of the second clamping hole is smaller than the minimum diameter of the second connecting hole, the second hose is in the connected state when passing through the second connecting hole, and in the disconnected state when passing through the second clamping hole.

8. The teaching and research experimental device according to claim 1, characterized in that: The light source is a lamp, which is located vertically above the aquarium. The lamp's mounting rod is rotatably supported on the support plate, and the lamp's light intensity is adjustable. Alternatively, the light source is a flexible light strip, which is wrapped around the outer peripheral surface of the transparent and light-transmitting peripheral wall, and the light intensity of the flexible light strip is adjustable.

9. The teaching and research experimental device according to claim 8, characterized in that: The light source is the lamp, and the teaching and research experimental device also includes transparent light-transmitting plates of different colors, which are detachably placed at the top opening of the receiving cavity.

10. The teaching and research experimental device according to any one of claims 1 to 9, characterized in that: The teaching and research experimental device also includes a carrying bag, which includes a supporting bottom wall, a first side wall, a second side wall, a third side wall, a fourth side wall, and two handles. The support plate is fixedly installed on the supporting bottom wall. The first side wall, the second side wall, the third side wall, and the fourth side wall are all made of flexible material and are sequentially connected to the four sides of the supporting bottom wall. The two handles are respectively protruding from the supporting bottom wall and installed on the first side wall and the third side wall. The first sidewall is detachably connected between the second sidewall and the fourth sidewall via Velcro, and the third sidewall is detachably connected between the second sidewall and the fourth sidewall via Velcro.

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