Thermoelectric power generation principle demonstration teaching aid

Abstract

The utility model provides a thermoelectric power generation principle demonstration teaching aid, and belongs to the field of teaching aids, and the teaching aid comprises a box body which is internally provided with a first partition plate, and the first partition plate divides the interior of the box body into a first cavity and a second cavity; the thermoelectric power generation piece is vertically arranged on the first partition plate, the cold end face of the thermoelectric power generation piece faces the first cavity or the second cavity, the hot end face of the thermoelectric power generation piece faces the second cavity or the first cavity, the positive output end and the negative output end of the thermoelectric power generation piece are connected with binding posts respectively, and a lamp bead is connected between the two binding posts through a wire. The heat-conducting fin group comprises two heat-conducting fins, the two heat-conducting fins are correspondingly attached to the hot end face and the cold end face of the thermoelectric power generation sheet, the two heat-conducting fins correspondingly extend into the first cavity and the second cavity, and the heat-conducting fins completely cover the hot end face and the cold end face of the thermoelectric power generation sheet. And single-point heating is prevented from being unfavorable for formation of stable and effective electromotive force, so that the demonstration result is not influenced.

Description

Technical Field

[0001] The utility model relates to the field of teaching aids, in particular to a teaching aid for demonstrating the principle of thermoelectric power generation. Background Art

[0002] Thermoelectric power generation is to generate electricity by using temperature difference. Its technical principle is based on the thermoelectric effect, which refers to the thermoelectric phenomenon of the voltage difference between two substances caused by the temperature difference between two different electrical conductors or semiconductors. In order to enable students to intuitively understand and learn the principle of thermoelectric power generation, there are various teaching aids for demonstrating thermoelectric power generation in the prior art, but the principles are basically the same. For example, the teaching aid for demonstrating the principle of a thermoelectric generator disclosed in Patent CN106952546A can visually see the demonstration result, but its structure is relatively complex, and the heat source uses an alcohol lamp for heating. The heating of the alcohol lamp is uneven. Especially when the area of the thermoelectric power generation chip is large, that is, when the areas of the internal P-type conductor and N-type conductor are large, the heating of the alcohol lamp is concentrated at one point, which is not conducive to the formation of a stable and effective electromotive force for the thermoelectric power generation principle, thus affecting the demonstration result. Content of the Utility Model

[0003] The existing teaching aids for demonstrating the thermoelectric principle have a relatively complex structure, and alcohol is used for heating when heating the thermoelectric power generation chip, resulting in uneven heating. Especially when the area of the thermoelectric power generation chip is large, the heating of the alcohol lamp is concentrated at one point, which is not conducive to the formation of a stable and effective electromotive force for the thermoelectric power generation principle and affects the demonstration effect. At least one aspect or one purpose of this application can solve the above problems. Specifically, a teaching aid for demonstrating the thermoelectric power generation principle is designed, and the technical solution adopted is as follows:

[0004] A teaching aid for demonstrating the thermoelectric power generation principle, comprising:

[0005] A box body, in which a first partition is provided. The first partition divides the interior of the box body into a first cavity and a second cavity. The first cavity and the second cavity are used for containing media with temperature differences.

[0006] A thermoelectric power generation chip, which is vertically arranged on the first partition with its cold end face facing the first cavity or the second cavity and its hot end face facing the second cavity or the first cavity. Positive and negative output terminals of the thermoelectric power generation chip are respectively connected with connection terminals, and a lamp bead is connected between the two connection terminals through a wire.

[0007] A heat conducting sheet group, which includes two heat conducting sheets. The two heat conducting sheets are correspondingly attached to the hot end face and the cold end face of the thermoelectric power generation chip. At the same time, the two heat conducting sheets correspondingly extend into the first cavity and the second cavity, and the heat conducting sheets completely cover the cold end face and the hot end face of the thermoelectric power generation chip.

[0008] Preferably, it further includes:

[0009] Two thermometers are arranged on the box body close to the first cavity and the second cavity.

[0010] Preferably, a plurality of thermoelectric generators and a plurality of heat conducting fin groups are respectively arranged. The plurality of thermoelectric generators are arranged at intervals along the length direction of the first partition board, and the plurality of heat conducting fin groups are arranged at intervals along the length direction of the first partition board.

[0011] Preferably, a plurality of second partition boards are respectively arranged in the first cavity and the second cavity. The second partition boards in the first cavity and the second partition boards in the second cavity are arranged in alignment along the length direction of the first partition board. The plurality of second partition boards are arranged at intervals along the length direction of the first partition board. Each second partition board is perpendicular to the bottom of the box body. The second partition boards divide the first cavity into a plurality of first sub-cavities and divide the second cavity into a plurality of second sub-cavities. The plurality of heat conducting fin groups are correspondingly located in the plurality of first sub-cavities and the plurality of second sub-cavities.

[0012] Preferably, installation grooves are respectively arranged at the positions of the bottom end surface and the side wall of the box body corresponding to the second partition boards, and at the positions of the first partition board corresponding to the installation of the second partition boards. Sealing gaskets are arranged in the installation grooves. The second partition boards are hermetically connected with the box body and between the second partition boards.

[0013] Preferably, heat insulating layers are arranged on both side surfaces of the second partition boards.

[0014] Preferably, the heat conducting fins are aluminum sheets.

[0015] Preferably, the periphery of the box body is also wrapped with a heat insulating layer.

[0016] Preferably, a cover body is arranged on the upper surface of the box body corresponding to the positions of the first cavity and the second cavity.

[0017] The structure of the utility model is simple and convenient for demonstration. By arranging the box body and partitioning it into the first cavity and the second cavity inside, and loading media with different temperatures, such as hot water and cold water, hot water and ice water, hot water and liquid nitrogen, etc. in the two cavities, the heat conducting fin groups are used to transfer the heat of the hot medium and the cold of the cold medium to the hot end face and the cold end face of the thermoelectric generator, improving the uniform heating of the thermoelectric generator and avoiding single-point heating, which is not conducive to forming a stable and effective electromotive force and thus affecting the demonstration result. Description of the Drawings

[0018] Figure 1 is a perspective view of the utility model;

[0019] Figure 2 is a perspective view of the box body after the cover body is covered.

[0020] In the figure, 1 is the box body, 2 is the first partition board, 3 is the thermoelectric generator, 4 is the heat conducting sheet, 5 is the terminal, 6 is the lamp bead, 7 is the wire, 8 is the thermometer, 9 is the frame body, 10 is the heat insulation layer, 11 is the heat insulating layer, 12 is the second partition board, 13 is the installation groove, 14 is the gasket, and 15 is the cover body. Detailed implementation manners

[0021] To clearly illustrate the technical features of this solution, the present utility model will be elaborated in detail below through specific implementation manners in combination with the attached drawings.

[0022] In addition, in the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] As Figure 1-2 shown, a teaching aid for demonstrating the thermoelectric power generation principle includes a box body 1. A first partition board 2 is vertically provided on the bottom surface of the box body 1. The first partition board 2 divides the interior of the box body 1 into a first cavity and a second cavity. Media with temperature differences are used to be contained in the first cavity and the second cavity. For example, hot water, hot oil, etc. are contained in the first cavity, and cold water, ice water, liquid nitrogen, etc. are contained in the second cavity; or cold water, ice water, liquid nitrogen, etc. can also be contained in the first cavity, and hot water, hot oil, etc. are contained in the second cavity.

[0024] A thermoelectric generator 3 is provided on the first partition board 2. The thermoelectric generator 3 is arranged perpendicular to the first partition board 2, so that the hot end face of the thermoelectric generator 3 faces the cavity filled with the hot medium, and the cold end face faces the cavity filled with the cold medium. In the specific embodiment of this application, hot water is contained in the first cavity and cold water is contained in the second cavity. Then, the hot end face of the thermoelectric generator 3 faces the side of the first cavity, and the cold end face faces the side of the second cavity. Terminals 5 are respectively connected to the positive and negative output ends of the thermoelectric generator 3. A lamp bead 6 is connected between the two terminals 5 through a wire 7. The brightness of the lamp bead 6 can reflect the magnitude of the power generated by the thermoelectric generator 3.

[0025] In order to transfer the heat of the hot water in the first cavity to the hot end face of the thermoelectric generator 3 and transfer the cold of the cold water in the second cavity to the cold end face of the thermoelectric generator 3, a heat conducting fin group is provided on the thermoelectric generator 3. The heat conducting fin group includes two heat conducting fins 4, and the two heat conducting fins 4 are correspondingly mounted on the hot end face and the cold end face of the thermoelectric generator 3. At the same time, the two heat conducting fins 4 correspondingly extend into the first cavity and the second cavity. The heat conducting fin 4 is made of an aluminum sheet, and the aluminum sheet has good thermal conductivity. In order to ensure uniform heat conduction, the above-mentioned heat conducting fin 4 completely covers the cold end face and the hot end face of the thermoelectric generator 3.

[0026] Further, in addition to the above components, this demonstration teaching aid also includes two thermometers 8. The two thermometers 8 are arranged on the box body 1 close to the first cavity and the second cavity. The two thermometers 8 can be infrared thermometers 8, digital thermometers 8 or mercury thermometers 8. A rack 9 for placing the thermometers 8 is provided on the box body 1. The two thermometers 8 are used to measure the temperature of the medium in the first cavity and the second cavity, so that students can visually witness that the temperature difference is the prerequisite for the thermoelectric generator 3 to generate electricity.

[0027] Further, in order to demonstrate the influence of the series and parallel connection of multiple thermoelectric generators 3 on the brightness of the light bulb, multiple of the above-mentioned thermoelectric generators 3 and heat conducting fin groups are respectively provided. The multiple thermoelectric generators 3 are arranged at intervals along the length direction of the first partition 2, and the multiple heat conducting fin groups are arranged at intervals along the length direction of the first partition 2. When connecting in series, connect the positive terminal 5 of each thermoelectric generator 3 to the negative terminal 5 of another thermoelectric generator 3, so that multiple thermoelectric generators 3 are connected in series to observe the brightness of each light bead 6, and then connect the positive terminals 5 of the multiple thermoelectric generators 3 to each other and the negative terminals 5 to each other, and observe the brightness of each light bead 6, so as to demonstrate the series and parallel connection of multiple thermoelectric generators 3 and adjust the voltage and current generated by the thermoelectric generator 3.

[0028] Further, a plurality of second partitions 12 are respectively provided in the first cavity and the second cavity. The second partitions 12 in the first cavity are arranged in alignment with the second partitions 12 in the second cavity along the length direction of the first partition 2. The plurality of second partitions 12 are arranged at intervals along the length direction of the first partition 2. Each second partition 12 is perpendicular to the bottom of the box body 1. The second partition 12 divides the first cavity into a plurality of first sub-cavities and divides the second cavity into a plurality of second sub-cavities. The plurality of heat conducting fin groups are correspondingly located in the plurality of first sub-cavities and the plurality of second sub-cavities. The plurality of first sub-cavities and second sub-cavities are for facilitating the individual demonstration of one of the thermoelectric generators 3. When it is necessary to demonstrate the influence of different temperature differences on the power generation of the thermoelectric generator 3, different media with different temperature differences can be filled into different sub-cavities for individual demonstration experiments.

[0029] Further, mounting grooves 13 are respectively provided at the positions on the bottom end surface and the side wall of the box body 1 corresponding to the second partition plate 12, and at the positions on the first partition plate 2 corresponding to the installation of the second partition plate 12. A sealing gasket 14 is provided in the mounting groove 13. The sealing gasket 14 is made of a rubber gasket or a silicone gasket. The second partition plate 12 is hermetically connected to the box body 1 and the second partition plate 12. This hermetic connection can prevent water exchange between each first sub-chamber or second sub-chamber.

[0030] Further, heat insulation layers 11 are provided on both side surfaces of the second partition plate 12. The heat insulation layer can reduce heat exchange between the first sub-chamber or the second sub-chamber, especially reduce the heat exchange when there is a temperature difference between adjacent first sub-chambers or adjacent second sub-chambers.

[0031] Further, in order to avoid slowing down heat dissipation, the periphery of the box body 1 is also wrapped with a heat preservation layer 10. A cover body 15 is provided at the positions on the upper surface of the box body 1 corresponding to the first cavity and the second cavity. The cover body 15 can be opened and closed. When the medium needs to be poured in, the cover body 15 is opened. After pouring is completed, the cover body 15 is covered to reduce evaporation and heat loss.

[0032] The above specific implementation manners cannot be used as a limitation to the protection scope of the present invention. For those skilled in the art of this technology, any alternative improvement or transformation made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0033] Those parts not detailed in the present invention are all well-known technologies to those skilled in the art of this technology.

Claims

1. A teaching aid for demonstrating the thermoelectric power generation principle, characterized in that, Comprising: A box body, within which a first partition is provided. The first partition divides the interior of the box body into a first cavity and a second cavity. The first cavity and the second cavity are used for containing media with temperature differences. A thermoelectric generator, which is vertically arranged on the first partition with its cold end face facing the first cavity or the second cavity and its hot end face facing the second cavity or the first cavity. The positive and negative output terminals of the thermoelectric generator are respectively connected with connection terminals, and a lamp bead is connected between the two connection terminals through a wire. A heat conducting sheet group, which includes two heat conducting sheets. The two heat conducting sheets are correspondingly mounted on the hot end face and the cold end face of the thermoelectric generator. At the same time, the two heat conducting sheets correspondingly extend into the first cavity and the second cavity, and the heat conducting sheets completely cover the cold end face and the hot end face of the thermoelectric generator.

2. The demonstration teaching aid for the thermoelectric power generation principle according to claim 1, characterized in that, It further comprises: Two thermometers, which are arranged on the box body close to the first cavity and the second cavity.

3. The demonstration teaching aid for the principle of thermoelectric power generation according to claim 1 or 2, characterized in that, A plurality of the thermoelectric generators and a plurality of the heat conducting sheet groups are respectively provided. The plurality of thermoelectric generators are arranged at intervals along the length direction of the first partition, and the plurality of heat conducting sheet groups are arranged at intervals along the length direction of the first partition.

4. The demonstration teaching aid for the thermoelectric power generation principle according to claim 3, characterized in that, A plurality of second partitions are respectively provided in the first cavity and the second cavity. The second partitions in the first cavity and the second partitions in the second cavity are arranged in alignment along the length direction of the first partition. The plurality of second partitions are arranged at intervals along the length direction of the first partition. Each second partition is perpendicular to the bottom of the box body. The second partition divides the first cavity into a plurality of first sub-cavities and divides the second cavity into a plurality of second sub-cavities. The plurality of heat conducting sheet groups are correspondingly located in the plurality of first sub-cavities and the plurality of second sub-cavities.

5. The demonstration teaching aid for the thermoelectric power generation principle according to claim 4, characterized in that, Installation grooves are respectively provided on the bottom end face and the side wall of the box body at the positions corresponding to the second partitions, and at the positions of the first partition corresponding to the installation of the second partitions. Sealing gaskets are provided in the installation grooves, and the second partitions are hermetically connected between the box body and the second partitions.

6. The demonstration teaching aid for the thermoelectric power generation principle according to claim 5, characterized in that, Heat insulation layers are provided on both side faces of the second partition.

7. A demonstration teaching aid for the principle of thermoelectric power generation according to claim 1, characterized in that, The heat conducting sheet is an aluminum sheet.

8. A demonstration teaching aid for the principle of thermoelectric power generation according to claim 1, characterized in that, The periphery of the box body is further wrapped with a heat insulation layer.

9. A demonstration teaching aid for the thermoelectric power generation principle according to claim 1, characterized in that, Lids are provided on the upper surface of the box body at the positions corresponding to the first cavity and the second cavity.

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