Demonstration teaching aid for hydrogen fuel cell principle

Abstract

The invention discloses a hydrogen fuel cell principle demonstration teaching aid, and relates to the field of teaching aids, the hydrogen fuel cell principle demonstration teaching aid comprises a cell box, the top of the cell box is covered with a sealing cover, one side of the cell box is fixedly provided with a cathode groove, the other side of the cell box is fixedly provided with an anode groove, an anode column is inserted into the anode groove, and a cathode column is inserted into the cathode groove. A charging power source is installed on the circumferential outer wall of the cathode groove, a releasing electric appliance is installed on the circumferential outer wall of the anode groove, and a charging and discharging switching mechanism is fixedly installed at the bottom of the battery box. According to the demonstration teaching aid for the hydrogen fuel cell principle, the charging and discharging principle of a hydrogen fuel cell can be displayed only by rotating the switching wheel without plugging any joint, and a traditional wire clamping connection mode is replaced by rotating the switching wheel through back-and-forth switching between internal conductive contacts; loosening or deformation caused by abrasion between the wire connector and the wiring contact of the discharge battery module is avoided, and the service life of the teaching aid is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of teaching aids, and particularly to a teaching aid for demonstrating the principle of a hydrogen fuel cell. Background Art

[0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. Its basic principle is the reverse reaction of electrolyzing water. Hydrogen and oxygen are respectively supplied to the anode and the cathode. After hydrogen diffuses outward through the anode and reacts with the electrolyte, electrons are released and reach the cathode through an external load. In this process, hydrogen reacts with oxygen to generate water, and electrical energy is produced as a byproduct.

[0003] In a school experiment class, if the principle of a hydrogen fuel cell needs to be visually demonstrated, a corresponding teaching aid is required;

[0004] After retrieval, a Chinese patent with the publication number CN205122059U discloses a teaching aid for demonstrating a hydrogen fuel cell. The text includes an installation platform for the teaching aid. On the upper end surface of the left side of the installation platform, a rectangular first slot and a second slot are formed. A discharge battery module and a power generation battery module are respectively inserted into the first slot and the second slot. Between the first slot and the second slot, two rectangular third slots are formed on the installation platform. A water storage tank is inserted into the third slot. The water storage tank is respectively connected to the discharge battery module and the power generation battery module through hoses. On the upper end surface of the right side of the installation platform, a slot hole penetrating the bottom surface of the installation platform is formed. A motor is inserted and fixed in the slot hole of the installation platform. An impeller is fixedly connected to the rotating shaft of the motor. The motor is electrically connected to the power generation battery module through a wire;

[0005] Although the above device can demonstrate the great development prospect of a hydrogen fuel cell, in actual use, the wiring contacts of the discharge battery module are exposed outside, and external power supply wires need to be connected for power supply. The joints of the power supply wires are generally connected to the wiring contacts of the discharge battery module by clamping. During long-term demonstration, wear will occur between the joints of the power supply wires and the wiring contacts of the discharge battery module, resulting in loosening or deformation of the wire joints (such as alligator clips) and the wiring contacts of the discharge battery module, and further causing poor contact, so that phenomena such as unstable current and sudden power-off of the teaching aid may occur in the experiment, affecting the demonstration effect, and the exposed wiring contacts of the discharge battery module may be accidentally touched by students or teachers during the demonstration, thus causing danger. Summary of the Invention

[0006] The present disclosure provides a teaching aid for demonstrating the principle of a hydrogen fuel cell, which at least overcomes the problems in the related art to a certain extent.

[0007] Other features and advantages of the present disclosure will become apparent through the following detailed description, or will be partially learned through the practice of the present disclosure.

[0008] According to one aspect of the present disclosure, a demonstration teaching aid for the principle of a hydrogen fuel cell is provided, including a battery box. The top of the battery box is covered with a sealing cover. One side of the battery box is fixedly provided with a cathode groove, and the other side of the battery box is fixedly provided with an anode groove. An anode column is inserted inside the anode groove, and a cathode column is inserted inside the cathode groove. A charging power source is installed on the circumferential outer wall of the cathode groove, and a releasing electrical appliance is installed on the circumferential outer wall of the anode groove. A charge-discharge switching mechanism is fixedly installed at the bottom of the battery box. Support seats are installed on both sides of the bottom of the charge-discharge switching mechanism. A fixed cover is provided on the charge-discharge switching mechanism. A moving platform is movably arranged inside the fixed cover, and a rack is screwed and installed on the surface of the moving platform.

[0009] In some embodiments, the sealing cover is snap-fitted and fixed to the upper side inside the battery box. The sealing cover is in an "8" shape, and both ends of the sealing cover are circular. A plurality of groups of card seats are evenly arranged on the circumferential outer walls of both ends of the sealing cover, and the cross-section of the card seat is in an "L" shape.

[0010] In some embodiments, a handle is fixedly provided on the sealing cover. The handle is in a "U" shape. Two support seats are fixedly connected to the bottom of the battery box through the charge-discharge switching mechanism, and the two support seats are symmetrically structured about the central axis of the charge-discharge switching mechanism.

[0011] In some embodiments, a negative wire A and a positive wire A are respectively installed on the charging power source; a negative wire B and a positive wire B are respectively installed on the releasing electrical appliance; one end of the negative wire B far from the releasing electrical appliance is installed with a discharge power-on seat A, one end of the positive wire B far from the releasing electrical appliance is installed with a discharge power-on seat B, one end of the negative wire A far from the charging power source is installed with a charging power-on seat A, and one end of the positive wire A far from the charging power source is installed with a charging power-on seat B.

[0012] In some embodiments, the charging power-on seat A and the discharge power-on seat A are installed together, the charging power-on seat B and the discharge power-on seat B are installed together, and the charging power-on seat A, the discharge power-on seat A, the charging power-on seat B, and the discharge power-on seat B are provided with a moving platform at the bottom.

[0013] In some embodiments, a cathode column is installed above the charging power-on seat A, and an anode column is installed above the charging power-on seat B. Snap balls are provided at the bottoms of the anode column and the cathode column; the internal structures of the charging power-on seat A, the discharge power-on seat A, the charging power-on seat B, and the discharge power-on seat B are the same; a plurality of groups of spiral blades are evenly arranged on the circumferential outer walls of the cathode column and the anode column, and a gas aggregation cylinder is wrapped outside both the cathode column and the anode column. The gas aggregation cylinder is made of sponge and has a cross-section in a plum blossom shape.

[0014] In some embodiments, an installation groove is formed inside the charging power supply base B. A spring is arranged inside the installation groove. A floating seat is movably arranged inside the installation groove through the spring. A stress inclined surface is arranged on the outer side of the top of the floating seat. A clamping groove is formed in the top of the floating seat. The sizes of the clamping groove and the clamping ball are adapted to each other. The clamping ball is clamped inside the clamping groove. The clamping ball is electrically connected to the positive wire A through the floating seat.

[0015] In some embodiments, the charge-discharge switching mechanism includes a fixed cover, a perforation, a switching wheel, a charging indicator hole, a discharging indicator hole, a moving table, a limiting seat, a limiting column, a rack and a gear. The fixed cover is installed at the bottom of the battery box. Perforations are formed on both sides of the outer wall of the fixed cover. The perforations are rectangularly arranged. The negative wire A, the negative wire B, the positive wire A and the positive wire B are respectively inserted into the two groups of perforations.

[0016] In some embodiments, a switching wheel is movably installed on the fixed cover. A gear is installed at the end of the rotating shaft of the switching wheel. A charging indicator hole and a discharging indicator hole are respectively formed on one side of the switching wheel. An indicating needle is arranged on the outer side of the switching wheel.

[0017] In some embodiments, a rack is installed at the bottom of the gear. The sizes of the rack and the gear are adapted to each other. The rack is meshed and connected with the gear. Limiting seats are installed on both sides of the moving table at the bottom of the rack. Limiting columns are respectively inserted into the two groups of limiting seats. The limiting columns are fixedly connected to the side wall of the fixed cover through a mounting frame.

[0018] The technical solutions provided in the embodiments of the present application at least include the following beneficial effects:

[0019] There is no need to plug or unplug any connectors. Only by rotating the switching wheel can the charging and discharging principle of the hydrogen fuel cell be demonstrated. By rotating the switching wheel, the internal conductive contacts are switched back and forth, replacing the traditional wire clamping connection method, avoiding wear between the wire connectors and the wiring contacts of the discharging battery module, resulting in loosening or deformation, and extending the service life of the teaching aid.

[0020] Furthermore, by setting two gears on the switching wheel, namely the charging indicator hole and the discharging indicator hole, different circuit loops can be switched by rotating the switching wheel, avoiding the time-consuming problem of connecting wires one by one in the traditional plugging and unplugging operation. When explaining the "fuel cell charge-discharge cycle", the teacher can quickly switch the mode, allowing students to directly observe the laws of voltage and current changing with the mode; the conductive contacts are hidden inside the charge-discharge switching mechanism, and only the insulating rotating handle is exposed outside. Students cannot directly touch the electrodes or wire connectors, avoiding the electric shock risk caused by accidental contact, which is especially suitable for experimental courses in primary and junior high schools. Description of the Drawings

[0021] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0022] Figure 1 The front view of a demonstration teaching aid for the principle of a hydrogen fuel cell in an embodiment of the present application;

[0023] Figure 2 is Figure 1 The bottom view of the demonstration teaching aid for the principle of the hydrogen fuel cell shown;

[0024] Figure 3 is Figure 1 The top view of the demonstration teaching aid for the principle of the hydrogen fuel cell shown;

[0025] Figure 4 The schematic diagram of the internal structure of the battery box in an embodiment of the present application;

[0026] Figure 5 The schematic diagram of the spiral blade in an embodiment of the present application;

[0027] Figure 6 The schematic diagram of the charge-discharge switching mechanism in an embodiment of the present application;

[0028] Figure 7 is Figure 6 The rear view of the charge-discharge switching mechanism shown;

[0029] Figure 8 is Figure 6 The sectional view of the charge-discharge switching mechanism shown;

[0030] Figure 9 The schematic diagram of the charging power supply socket in an embodiment of the present application;

[0031] Reference numerals

[0032] 1. Battery box; 11. Cathode tank; 111. Cathode column; 112. Spiral blade; 113. Gas accumulation cylinder; 12. Anode tank; 121. Anode column; 2. Sealing cover; 21. Card holder; 22. Handle; 3. Charge-discharge switching mechanism; 30. Fixed cover; 31. Perforation; 32. Switching wheel; 33. Charge indicator hole; 331. Discharge indicator hole; 34. Moving platform; 35. Limit seat; 36. Limit column; 37. Rack; 38. Gear; 4. Support seat; 5. Charging power supply; 51. Negative wire A; 510. Charging power-on seat A; 52. Positive wire A; 520. Charging power-on seat B; 5201. Floating seat; 5202. Force-receiving inclined plane; 5203. Card slot; 5204. Card ball; 6. Release electrical appliance; 61. Negative wire B; 610. Discharge power-on seat A; 62. Positive wire B; 620. Discharge power-on seat B. Detailed implementation manners

[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more complete and thorough, and will fully convey the concept of the example embodiments to those skilled in the art. The features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0034] In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted.

[0035] In one embodiment, as Figures 1-8 shown, the demonstration teaching aid based on the principle of hydrogen fuel cell in this application may include a battery box 1. The top of the battery box 1 is covered with a sealing cover 2. A cathode tank 11 is fixedly arranged on one side of the battery box 1, and an anode tank 12 is fixedly arranged on the other side of the battery box 1. An anode column 121 is inserted into the anode tank 12, and a cathode column 111 is inserted into the cathode tank 11. A charging power supply 5 is installed on the circumferential outer wall of the cathode tank 11, and a release electrical appliance 6 is installed on the circumferential outer wall of the anode tank 12. A charge-discharge switching mechanism 3 is fixedly installed at the bottom of the battery box 1, and support seats 4 are installed on both sides of the bottom of the charge-discharge switching mechanism 3. A fixed cover 30 is arranged on the charge-discharge switching mechanism 3, and a moving platform 34 is movably arranged inside the fixed cover 30. A rack 37 is screwed and installed on the surface of the moving platform 34.

[0036] Working principle: When in use, first turn on the external switch of the charging power supply 5. At this time, the negative wire A51, the charging power supply socket A510, the cathode column 111, the anode column 121, the charging power supply socket B520, and the positive wire A52 form a closed loop, causing the electrolyte inside the battery box 1, where the electrolyte includes but is not limited to dilute sulfuric acid, to generate hydrogen gas near the cathode column 111. There are many bubbles and they rise quickly, and oxygen gas is generated near the anode column 121. There are few bubbles and they rise slowly. This is the charging process.

[0037] The discharging process is as follows: At this time, rotate the gear 38. The gear 38 drives the rack 37 to move horizontally, causing the separation between the cathode column 111 and the charging power supply socket A510, and the separation between the anode column 121 and the charging power supply socket B520. Instead, the bottom of the cathode column 111 is electrically connected to the discharging power supply socket A610, and the bottom of the anode column 121 is electrically connected to the discharging power supply socket B620. At this time, the negative wire B61, the discharging power supply socket A610, the cathode column 111, the anode column 121, the discharging power supply socket B620, and the positive wire B62 form a closed loop. Turn on the switch of the fan on the releasing electrical appliance 6, and the fan can rotate and work.

[0038] In the above way, the demonstration of the principle of the hydrogen fuel cell is completed; the demonstration method is simple and fast, without the need to plug or unplug any connectors. Just rotate the switching wheel 32 to display the charging and discharging principles of the hydrogen fuel cell. The rotation of the switching wheel 32 realizes the back-and-forth switching between internal conductive contacts, replacing the traditional wire clamping connection method, avoiding wear between the wire connectors and the wiring contacts of the discharging battery module, which may cause loosening or deformation, and extending the service life of the teaching aid; there are two gears on the switching wheel 32, namely the charging indicator hole 33 and the discharging indicator hole 331. The charging indicator hole 33 represents the charging mode, and the discharging indicator hole 331 represents the discharging mode. By rotating the switching wheel 32, different circuit loops are switched, avoiding the time-consuming problem of connecting wires one by one in the traditional plugging and unplugging operation. When explaining the "charging and discharging cycle of the fuel cell", the teacher can quickly switch the mode and cooperate with the dynamic blackboard writing or PPT to let the students directly observe the laws of voltage and current changing with the mode; the conductive contacts are hidden inside the charging and discharging switching mechanism 3, and only the insulating rotating handle is exposed outside. Students cannot directly touch the electrodes or wire connectors, avoiding the electric shock risk caused by accidental contact, which is especially suitable for experimental classes in primary and junior high schools.

[0039] When the mobile station 34 is moving horizontally, the limiting posts 36 are inserted into the limiting seats 35 on both sides of the mobile station 34. The length of the limiting posts 36 limits the horizontal movement range of the mobile station 34. The movement range of this specific distance can be adapted to the switching distance between the charging power supply seat A510, the discharging power supply seat A610, the charging power supply seat B520, and the discharging power supply seat B620, so that when the mobile station 34 moves to the leftmost end, the anode post 121 contacts the charging power supply seat B520. On the contrary, when the mobile station 34 moves to the rightmost end, the anode post 121 contacts the discharging power supply seat B620, ensuring the reliability of the demonstration device during use;

[0040] The clamping method between the anode post 121 and the charging power supply seat B520 and the discharging power supply seat B620 is the same, and this method is the same as the clamping method between the cathode post 111 and the charging power supply seat A510 and the discharging power supply seat A610. Here, only the clamping method between the anode post 121 and the charging power supply seat B520 is described: a clamping ball 5204 is arranged at the bottom of the anode post 121. When the clamping ball 5204 moves horizontally and contacts the force-receiving inclined surface 5202, the force-receiving inclined surface 5202 is squeezed, causing the floating seat 5201 to move downward and compress the spring at its bottom (the spring is not drawn in the figure). When the clamping ball 5204 moves directly above the clamping groove 5203, the spring resets, causing the clamping ball 5204 to fit tightly inside the clamping groove 5203, completing the closing of the circuit; the surfaces of the clamping ball 5204 and the floating seat 5201 can be silver-plated to maintain good electrical conductivity even after long-term friction;

[0041] In the hydrogen fuel cell charge and discharge principle demonstration teaching aid, integrating the battery box 1, the discharge electrical appliance 6, the charging power supply 5 and the charge-discharge switching mechanism 3 into a whole is an important upgrade to the traditional decentralized teaching aids. By optimizing the spatial structure and functional connection, the practicability, safety and teaching efficiency of the teaching aid are significantly improved. In the traditional mode, multiple independent components such as batteries, power supplies, and switches need to be carried separately. After integration, only one device is required to complete the task. Teachers can carry the teaching aid with one hand and conduct on-site demonstrations in the classroom, or easily move it across classes and campuses by putting it in a backpack. The integrated design avoids the problem of messy desktops caused by cable connections in traditional decentralized devices, such as wire entanglement and component scattering, reducing the required area of the operating table, which is especially suitable for scenarios with small classes or limited laboratory space. Students cannot directly contact the live components, reducing the risk of electric shock. Although it has an integrated appearance, it adopts a modular structure inside. For example, the discharge electrical appliance 6 and the charging power supply 5 can be independently disassembled. When a certain component fails, teachers can quickly replace the module. Integrating multiple functions of the hydrogen fuel cell in a single device not only solves the pain points of traditional teaching aids such as "scattered and difficult to use, dangerous and error-prone", but also through upgrades in four dimensions: space compression, process simplification, safety enhancement, and data accuracy, transforms the abstract electrochemical principle into an intuitive experience that can be observed, operated, and verified. Whether it is the enlightenment teaching in the basic education stage or the scientific research preview in higher education, the integrated teaching aid can become an efficient bridge connecting "theoretical knowledge" and "practical innovation".

[0042] In one embodiment, the sealing cover 2 is snap-fitted and fixed to the upper inner side of the battery box 1. The sealing cover 2 is in an "8" shape, and both ends of the sealing cover 2 are circular. A plurality of groups of card seats 21 are evenly arranged on the circumferential outer walls at both ends of the sealing cover 2, and the cross-section of the card seat 21 is in an "L" shape.

[0043] In one embodiment, a handle 22 is fixedly arranged on the sealing cover 2. The handle 22 is in a "U" shape. Two groups of support seats 4 are fixedly connected to the bottom of the battery box 1 through the charge-discharge switching mechanism 3, and the two groups of support seats 4 are centrosymmetric structures with respect to the central axis of the charge-discharge switching mechanism 3.

[0044] In one embodiment, a negative wire A51 and a positive wire A52 are respectively installed on the charging power supply 5, and a negative wire B61 and a positive wire B62 are respectively installed on the discharge electrical appliance 6. One end of the negative wire B61 far from the discharge electrical appliance 6 is provided with a discharge power-on seat A610, one end of the positive wire B62 far from the discharge electrical appliance 6 is provided with a discharge power-on seat B620, one end of the negative wire A51 far from the charging power supply 5 is provided with a charging power-on seat A510, and one end of the positive wire A52 far from the charging power supply 5 is provided with a charging power-on seat B520.

[0045] In one embodiment, the charging power supply base A510 and the discharging power supply base A610 are installed together, the charging power supply base B520 and the discharging power supply base B620 are installed together, and a moving platform 34 is provided at the bottom of the charging power supply base A510, the discharging power supply base A610, the charging power supply base B520 and the discharging power supply base B620.

[0046] In one embodiment, a cathode column 111 is installed on the upper side of the charging power supply base A510, an anode column 121 is installed on the upper side of the charging power supply base B520, and snap balls 5204 are provided at the bottoms of both the anode column 121 and the cathode column 111; the internal structures of the charging power supply base A510, the discharging power supply base A610, the charging power supply base B520 and the discharging power supply base B620 are the same; multiple groups of spiral blades 112 are uniformly arranged on the circumferential outer walls of the cathode column 111 and the anode column 121, and gas aggregation cylinders 113 are wrapped around the outer sides of the cathode column 111 and the anode column 121, and the gas aggregation cylinders 113 are made of sponge and have a plum blossom-shaped cross-section structure.

[0047] The spiral structure of the spiral blades 112 can significantly increase the surface area of the electrodes, make the contact between the electrolyte and the electrodes more sufficient, accelerate the rate of the electrochemical reaction, improve the output efficiency of the fuel cell, enhance the generation amount of bubbles, improve the display effect, and the spiral direction of the spiral blades 112 can guide the electrolyte to form a directional flow in the battery box, reduce the local concentration difference, avoid the "dead volume" of the electrolyte, and make the reaction more uniform.

[0048] The porous structure in the gas aggregation cylinders 113 has a large surface area and adsorption capacity, can quickly capture the gases generated by the electrochemical reaction, such as oxygen generated at the cathode and hydrogen generated at the anode, avoid the direct escape of the gases into the electrolyte, and facilitate observation and collection. By intercepting the gases through the porous medium, a visible bubble aggregation phenomenon is formed to visually display the gas generation process.

[0049] The pore network in the gas aggregation cylinders 113 can make the gases uniformly diffuse in the aggregation cylinders, avoid the gas jet or uneven reaction caused by too high local air pressure, and at the same time slow down the gas release speed, which is convenient for stable observation and measurement.

[0050] The flexible material of the sponge can buffer the mechanical contact between the electrodes and the battery box 1, prevent the electrodes or the container from being damaged by hard collision, and at the same time reduce the liquid splash when the teaching aid moves or tilts, improving the safety.

[0051] The spiral blades 112 accelerate the gas generation of the electrochemical reaction, and the sponge aggregation cylinders synchronously adsorb and collect the gases, forming an efficient link of "gas generation plus gas collection", which is suitable for quickly presenting the experimental phenomena during classroom demonstrations. The aggregation state of the gases in the sponge, such as the bubble size and the rising speed, can be directly observed through the transparent battery box 1 to help students understand the gas generation principle of the fuel cell and the electrode reaction differences, such as the different gas generation rates at the cathode and the anode.

[0052] Through the area - increasing and flow - promoting characteristics of the spiral blade 112 and the adsorption and homogenization characteristics of the sponge, multiple improvements in the electro - chemical reaction efficiency, gas collection effect, and demonstration intuitiveness are achieved, which is especially suitable for the dynamic display of principles and students' understanding in teaching scenarios; during actual use, in combination with the transparent battery box 1 and the gas outlet pipe, expansion experiments such as gas production rate measurement and voltage output can be further designed to deepen the teaching effect.

[0053] In one embodiment, an installation groove is formed inside the charging and power - on seat B520. A spring is arranged inside the installation groove. A floating seat 5201 is movably arranged inside the installation groove through the spring. A force - receiving inclined surface 5202 is arranged on the outer side of the top of the floating seat 5201. A clamping groove 5203 is formed at the top of the floating seat 5201. The sizes of the clamping groove 5203 and the clamping ball 5204 are adapted to each other. The clamping ball 5204 is clamped inside the clamping groove 5203. The clamping ball 5204 is electrically connected to the positive - pole wire A52 through the floating seat 5201.

[0054] In one embodiment, the charge - discharge switching mechanism 3 includes a fixed cover 30, perforations 31, a switching wheel 32, a charging indication hole 33, a discharging indication hole 331, a moving table 34, a limiting seat 35, a limiting column 36, a rack 37, and a gear 38. The fixed cover 30 is installed at the bottom of the battery box 1. Perforations 31 are formed on both sides of the outer wall of the fixed cover 30. The perforations 31 are rectangularly arranged. The negative - pole wire A51, negative - pole wire B61, positive - pole wire A52, and positive - pole wire B62 are respectively inserted into the two groups of perforations 31.

[0055] In one embodiment, a switching wheel 32 is movably installed on the fixed cover 30. A gear 38 is installed at the end of the rotating shaft of the switching wheel 32. A charging indication hole 33 and a discharging indication hole 331 are respectively formed on one side of the switching wheel 32. An indicating needle is arranged on the outer side of the switching wheel 32.

[0056] In one embodiment, a rack 37 is installed at the bottom of the gear 38. The rack 37 is adapted to the gear 38 in size. The rack 37 is meshed with the gear 38. Limiting seats 35 are installed on both sides of the moving table 34 at the bottom of the rack 37. Limiting columns 36 are respectively inserted into the two groups of limiting seats 35. The limiting columns 36 are fixedly connected to the side wall of the fixed cover 30 through a mounting frame.

[0057] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present disclosure. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The description and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A demonstration teaching aid for the principle of a hydrogen fuel cell, comprising a battery box (1), characterized in that, The top of the battery box (1) is covered with a sealing cover (2). One side of the battery box (1) is fixedly provided with a cathode groove (11), and the other side of the battery box (1) is fixedly provided with an anode groove (12). An anode column (121) is inserted into the anode groove (12), and a cathode column (111) is inserted into the cathode groove (11). A charging power supply (5) is installed on the circumferential outer wall of the cathode groove (11), and a release electrical appliance (6) is installed on the circumferential outer wall of the anode groove (12). The bottom of the battery box (1) is fixedly installed with a charge-discharge switching mechanism (3). Support seats (4) are installed on both sides of the bottom of the charge-discharge switching mechanism (3). A fixed cover (30) is arranged on the charge-discharge switching mechanism (3). A moving platform (34) is movably arranged inside the fixed cover (30). A rack (37) is screwed and installed on the surface of the moving platform (34).

2. The demonstration teaching aid for the principle of hydrogen fuel cell according to claim 1, characterized in that, The sealing cover (2) is clamped and fixed on the upper side inside the battery box (1). The sealing cover (2) is arranged in an "8" shape. Both ends of the sealing cover (2) are circular. A plurality of groups of clamping seats (21) are evenly arranged on the circumferential outer walls at both ends of the sealing cover (2). The cross section of the clamping seat (21) is arranged in an "L" shape.

3. The demonstration teaching aid for the principle of hydrogen fuel cell according to claim 2, wherein: A handle (22) is fixedly arranged on the sealing cover (2). The handle (22) is arranged in a "U" shape. The bottom of the battery box (1) is fixedly connected with two support seats (4) through the charge-discharge switching mechanism (3). The two support seats (4) are symmetrically structured about the central axis of the charge-discharge switching mechanism (3).

4. The demonstration teaching aid based on the principle of hydrogen fuel cell according to claim 1, characterized in that: A negative wire A (51) and a positive wire A (52) are respectively installed on the charging power supply (5). A negative wire B (61) and a positive wire B (62) are respectively installed on the release electrical appliance (6). One end of the negative wire B (61) far away from the release electrical appliance (6) is installed with a discharge power-on seat A (610). One end of the positive wire B (62) far away from the release electrical appliance (6) is installed with a discharge power-on seat B (620). One end of the negative wire A (51) far away from the charging power supply (5) is installed with a charging power-on seat A (510). One end of the positive wire A (52) far away from the charging power supply (5) is installed with a charging power-on seat B (520).

5. The demonstration teaching aid according to the principle of the hydrogen fuel cell as claimed in claim 4, wherein: The charging power-on seat A (510) and the discharge power-on seat A (610) are installed together. The charging power-on seat B (520) and the discharge power-on seat B (620) are installed together. The charging power-on seat A (510), the discharge power-on seat A (610), the charging power-on seat B (520) and the discharge power-on seat B (620) are provided with a moving platform (34) at the bottom.

6. The demonstration teaching aid based on the principle of hydrogen fuel cell according to claim 5, characterized in that: On the upper side of the charging and power-on base A (510), a cathode column (111) is installed. On the upper side of the charging and power-on base B (520), an anode column (121) is installed. At the bottom of both the anode column (121) and the cathode column (111), there are clamping balls (5204). The internal structures of the charging and power-on base A (510), the discharging and power-on base A (610), the charging and power-on base B (520), and the discharging and power-on base B (620) are the same. On the circumferential outer walls of the cathode column (111) and the anode column (121), multiple groups of spiral blades (112) are evenly arranged. The outer sides of the cathode column (111) and the anode column (121) are both wrapped with a gas aggregation cylinder (113), and the gas aggregation cylinder (113) is made of sponge and has a plum blossom-shaped cross-section structure.

7. The demonstration teaching aid for the hydrogen fuel cell principle according to claim 6, characterized in that: An installation groove is opened inside the charging and power-on base B (520). A spring is arranged inside the installation groove. A floating seat (5201) is movably arranged inside the installation groove through the spring. A force-receiving inclined surface (5202) is arranged on the outer side of the top of the floating seat (5201). A clamping groove (5203) is opened at the top of the floating seat (5201). The sizes of the clamping groove (5203) and the clamping ball (5204) are adapted to each other. The clamping ball (5204) is clamped inside the clamping groove (5203). The clamping ball (5204) is electrically connected to the positive wire A (52) through the floating seat (5201).

8. The demonstration teaching aid for the principle of hydrogen fuel cell according to claim 1, characterized in that: The charge-discharge switching mechanism (3) includes a fixed cover (30), a perforation (31), a switching wheel (32), a charging indication hole (33), a discharging indication hole (331), a moving table (34), a limiting seat (35), a limiting column (36), a rack (37), and a gear (38). The fixed cover (30) is installed at the bottom of the battery box (1). Perforations (31) are opened on both sides of the outer wall of the fixed cover (30). The perforations (31) are rectangularly arranged. The negative wire A (51), the negative wire B (61), the positive wire A (52), and the positive wire B (62) are respectively inserted into the two groups of perforations (31).

9. The demonstration teaching aid based on the principle of hydrogen fuel cell according to claim 8, characterized in that: The switching wheel (32) is movably installed on the fixed cover (30). A gear (38) is installed at the end of the rotating shaft of the switching wheel (32). A charging indication hole (33) and a discharging indication hole (331) are respectively opened on one side of the switching wheel (32). An indicating needle is arranged on the outer side of the switching wheel (32).

10. The demonstration teaching aid based on the principle of hydrogen fuel cell according to claim 9, characterized in that: The rack (37) is installed at the bottom of the gear (38). The sizes of the rack (37) and the gear (38) are adapted to each other. The rack (37) is meshed and connected with the gear (38). Limiting seats (35) are installed on both sides of the moving table (34) at the bottom of the rack (37). Limiting columns (36) are respectively inserted into the two groups of limiting seats (35). The limiting columns (36) are fixedly connected to the side wall of the fixed cover (30) through a mounting frame.

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