Teaching demonstration device for heat transfer
By designing a teaching demonstration device including a shell, heat source and temperature-sensitive color-changing components, the problem that students find it difficult to understand the concept of heat transfer is solved, and the intuitive display of heat conduction, thermal radiation and thermal convection is achieved, which improves the teaching effect.
Patent Information
- Application Number
- CN202420733382.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-21
- Filing Date
- 2024-04-09
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-04-09
AI Technical Summary
It is difficult for students to intuitively understand the concept of heat transfer, especially the process of heat conduction.
A teaching demonstration device is designed, including a housing, a heat source and a temperature-sensitive color-distorting assembly. Through different combinations, the temperature-sensitive color-changing components show the effects of heat conduction, heat radiation and heat convection during the heating process of the heat source.
The device can intuitively display three forms of heat transfer, helping students to understand the heat transfer phenomenon in depth and improve teaching effectiveness.
Smart Images
Figure CN223038526U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a teaching demonstration device, in particular to a teaching demonstration device for heat transfer. Background Art
[0002] Heat transfer (or heat conduction) is a physical phenomenon in physics, referring to the phenomenon of heat energy transfer caused by a temperature difference. In heat transfer, the change in the internal energy of an object is measured by the amount of heat. There are mainly three basic forms of heat transfer: heat conduction, heat radiation, and heat convection. Among them, heat conduction (also known as thermal conduction) refers to the phenomenon of energy transfer that occurs through the microscopic vibration, displacement, and mutual collision of molecules, atoms, and electrons within an object when there is a temperature difference between different objects or within the same object. During the process of heat conduction, it is impossible for the naked eye to observe the movement of molecules, atoms, and electrons within the object. Therefore, in primary school science, it is relatively difficult for students to understand the concept of heat transfer. Content of the Utility Model
[0003] The purpose of the utility model is to provide a teaching demonstration device for heat transfer, which can enable students to deeply understand the concept of heat transfer and intuitively display the occurrence phenomena of different heat transfer situations to students.
[0004] The teaching demonstration device includes a housing, a heat source is positioned and fixedly connected to the housing, and a thermosensitive color-changing component is detachably fixedly connected to the housing; under the first combined setting application of the housing and the thermosensitive color-changing component, during the heating process of the heat source, the thermosensitive color-changing component shows a first display phenomenon of the heat conduction effect; and / or, under the second combined setting application of the housing and the thermosensitive color-changing component, during the heating process of the heat source, the thermosensitive color-changing component shows a second display phenomenon of the heat radiation effect; and / or, under the third combined setting application of the housing and the thermosensitive color-changing component, during the heating process of the heat source, the thermosensitive color-changing component shows a third display phenomenon of the heat convection effect.
[0005] Further, the housing includes a first outer shell in a hemispherical shape, and a plurality of positioning through holes are arranged at the outer diameter peripheral position of the first outer shell; the heat source includes a first heating element positioned and fixedly connected to the center of the sphere of the first outer shell; the first heating element includes an electric heating sheet.
[0006] Further, the thermosensitive color-changing component includes a metal strip coated with thermosensitive ink. When the first combined setting is applied, at least one end of the metal strip is inserted through the positioning through hole, and the metal strip is in contact with the first heating element; and / or, the thermosensitive color-changing component includes a metal disc coated with thermosensitive ink. When the first combined setting is applied, the metal disc is in contact with the first heating element, and the first heating element forms a supporting and positioning for the metal disc.
[0007] Further, at least two positioning through holes are provided along the diameter direction of the first housing. When the temperature-sensitive color-changing component includes a metal strip coated with temperature-sensitive ink, both ends of the metal strip are inserted into the two positioning through holes provided in the diameter direction, and the middle of the metal strip is in contact with the first heating element.
[0008] Further, when the temperature-sensitive color-changing component includes a metal disc, a support rod is radially connected to the outer periphery of the metal disc, and one end of the support rod is inserted into the positioning through hole. The first heating element and the support rod form a supporting and positioning for the metal disc.
[0009] Further, a plurality of the positioning through holes are equidistantly arranged along the outer diameter peripheral position of the first housing; when the second combination is applied, the temperature-sensitive color-changing component includes a plurality of wooden strips coated with temperature-sensitive ink, and each wooden strip is positioned and inserted into the positioning through hole. One end of each wooden strip is arranged towards the first heating element along the radial direction of the first housing, and the setting distances from one end of each wooden strip to the electric heating sheet are the same.
[0010] Further, both ends of the outer diameter peripheral position of the first housing are rotationally connected to a bracket assembly by a rotating shaft. The bracket assembly can be positioned and placed on a horizontal plane. The first housing can be turned and rotated around the bracket assembly. The first housing can be turned and rotated to a first working position where its outer diameter periphery is arranged along the horizontal plane, and the first housing can be turned and rotated to a second working position where its outer diameter periphery is arranged along the vertical plane.
[0011] Further, the temperature-sensitive color-changing component includes a wind wheel member coated with temperature-sensitive ink. The wind wheel member is positioned and mounted on the first housing through a mounting bracket. There is a heat conduction distance between the positioned and mounted wind wheel member and the first heating element, and their positions are relatively fixed.
[0012] Further, the mounting bracket extends along the radial direction of the first housing. The axis of the wheel blade of the wind wheel member corresponds to the first heating element. The heat conduction distance between the wind wheel member and the first heating element is equal to the radius of the first housing. The extending direction of the mounting bracket is perpendicular to and away from the outer diameter peripheral position of the first housing. The wind wheel member is mounted at the extending end position of the mounting bracket.
[0013] Further, a temperature measurement component is further included. The temperature measurement component includes a plurality of temperature detection end pieces and a temperature sensor electrically connected to each temperature detection end piece. Each temperature sensor is connected to a digital display device.
[0014] Further, at least two temperature detection end pieces are provided. The temperature detection end pieces include metal clip pieces, and each digital display device is integrally and fixedly installed on a bracket housing.
[0015] The teaching demonstration device of the present utility model is provided with a housing. A heat source is positioned and connected to the housing, a thermochromic component is detachably connected to the housing, the housing is connected to a bracket assembly, and the housing is rotatably arranged around the bracket assembly.
[0016] The beneficial effects of the present utility model are as follows:
[0017] Through the setting of a teaching demonstration device, the intuitive demonstration of the effects of three forms of heat transfer (heat conduction, heat radiation, and heat convection) can be effectively carried out, enabling students to simply and intuitively understand the heat transfer phenomenon and achieving a good teaching effect. Description of the Drawings
[0018] Figure 1 Schematic diagram of the application of the metal strip in the teaching demonstration device of Embodiment 1;
[0019] Figure 2 Schematic diagram of the application of the metal disc in the teaching demonstration device of Embodiment 1;
[0020] Figure 3 Schematic diagram of the first working position of the wooden strip in the teaching demonstration device of Embodiment 2;
[0021] Figure 4 Schematic diagram of the second working position of the wooden strip in the teaching demonstration device of Embodiment 2;
[0022] Figure 5 Schematic diagram of the first working position of the wind wheel in the teaching demonstration device of Embodiment 3;
[0023] Figure 6 Schematic diagram of the second working position of the wind wheel in the teaching demonstration device of Embodiment 3.
[0024] First housing 1, positioning through hole 11, first heating element 2, metal strip 31, metal disc 32, wooden strip 33, wind wheel 34, bracket assembly 4, temperature detection end piece 51, digital display device 52. Detailed Embodiments
[0025] In order to make the technical solutions, objectives, and advantages of the present utility model clearer, the present utility model will be further explained below with reference to the drawings and embodiments.
[0026] As Figures 1 to 6As shown in the figure, a teaching demonstration device of the present utility model includes a housing, a heat source is fixedly installed on the housing, and a thermochromic component is detachably installed on the housing. Under different combinations of the housing and the thermochromic component, when the heat source generates heat, during the heat generation process of the heat source, the thermochromic component can respectively display three effect display phenomena of heat conduction effect, heat radiation effect and heat convection effect.
[0027] Specifically, its structure is set as follows:
[0028] The housing includes a first outer shell 1 in a hemispherical shape, and a plurality of positioning through holes 11 are arranged at the outer diameter peripheral position of the first outer shell 1; the heat source includes a first heating element 2 supported by a support bracket fixedly installed at the inner bottom end of the first outer shell 1, and the first heating element 2 is externally connected to a power supply through the hollow support bracket, and the first heating element 2 is arranged at the center of the sphere of the first outer shell 1. The first heating element 2 is preferably an electric heating sheet.
[0029] The housing is connected to a bracket assembly 4, and the housing can be turned and rotated around the bracket assembly 4. Specifically: both ends of the outer diameter peripheral position of the first outer shell 1 are rotationally connected to the bracket assembly 4 by a rotating shaft, the bracket assembly 4 can be fixedly placed on a horizontal plane, the first outer shell 1 can be turned and rotated around the bracket assembly 4, the first outer shell 1 can be turned and rotated to a first working position where its outer diameter peripheral edge is arranged along the horizontal plane, and the first outer shell 1 can be turned and rotated to a second working position where its outer diameter peripheral edge is arranged along the vertical plane.
[0030] The bracket assembly 4 includes a bracket base and vertical brackets extending vertically at both ends of the bracket base, and both ends of the vertical brackets are connected to both ends of the first outer shell 1 by a rotating shaft.
[0031] It further includes a temperature measuring component, the temperature measuring component includes a plurality of temperature detection end pieces 51 and a temperature sensor electrically connected to each temperature detection end piece 51, each temperature sensor is connected to a digital display device 52, at least two temperature detection end pieces 51 are provided, the temperature detection end pieces 51 include metal clips, and each digital display device 52 is integrally and fixedly installed on a bracket housing. The bracket housing is fixedly installed on the bracket base.
[0032] Embodiment 1:
[0033] For the demonstration of heat conduction phenomenon, in the teaching demonstration device, the temperature-sensitive color-changing component includes a metal strip 31 coated with temperature-sensitive ink. Under the application of the first combined setting, at least one end of the metal strip 31 is inserted into the positioning through-hole 11, and the metal strip 31 is in contact with the first heating element 2; at least two positioning through-holes 11 are provided along the diameter direction of the first housing 1, and both ends of the metal strip 31 are inserted into the two positioning through-holes 11 arranged in the diameter direction.
[0034] When the heating element generates heat, the color change of the temperature-changing ink on the metal strip 31 in contact with it intuitively shows the heat conduction phenomenon, indicating that the temperature change is from the proximal end to the distal end of the first heating element 2.
[0035] The temperature detection end-piece 51 can be brought into contact with different positions of the metal strip 31, so that the temperature change situation can be intuitively displayed on the digital display device 52.
[0036] And / or, the temperature-sensitive color-changing component includes a metal disc 32 coated with temperature-sensitive ink. Under the application of the first combined setting, the metal disc 32 is in contact with the first heating element 2, and the first heating element 2 forms a supporting and positioning for the metal disc 32. A support rod is radially connected to the outer periphery of the metal disc 32, and one end of the support rod is inserted into the positioning through-hole 11, and the first heating element 2 and the support rod form a supporting and positioning for the metal disc 32.
[0037] When the heating element generates heat, the color change of the temperature-changing ink on the metal disc 32 in contact with it intuitively shows the heat conduction phenomenon, indicating that the temperature change is evenly and equidistantly extended from the proximal end of the first heating element 2 along the radial direction to the distal end.
[0038] Embodiment 2:
[0039] A plurality of positioning through-holes 11 are evenly distributed at equal intervals along the outer diameter peripheral position of the first housing 1; under the application of the second combined setting, the temperature-sensitive color-changing component includes a plurality of wooden strips 33 coated with temperature-sensitive ink, and each wooden strip 33 is positioned and inserted into the positioning through-hole 11, and one end of each wooden strip 33 is arranged towards the first heating element 2 along the radial direction of the first housing 1, and the setting distances from one end of each wooden strip 33 to the electric heating sheet are the same.
[0040] Insert wooden strips 33 coated with temperature-sensitive color-changing ink at equal distances around the first heating element 2, and fix two temperature detection end-pieces 51 at different positions far and near from the heat source. Cover the opening of the first housing 1 with a lid, and then connect the power supply of the first heating element 2. Analyze and summarize the transfer process and direction of heat radiation through the color change of the temperature-sensitive ink on the wooden strips 33 and the temperature reading changes displayed on the digital display device 52.
[0041] Based on the setting of the bracket assembly 4, we can also rotate the first housing by 90 degrees, and the wooden strip 33 will continue to change color towards the distal end. From this, it can be inferred that heat radiation can transfer heat in all directions. We can also find that the wooden strip 33 above the first outer shell 1 arranged vertically and in the second working position changes color faster. Since the wooden strip 33 is a poor conductor of heat, it shows that heat radiation is the main phenomenon here, accompanied by heat convection phenomenon.
[0042] Embodiment 3:
[0043] The temperature-sensitive color-changing component includes a wind wheel member 34 coated with temperature-sensitive ink. The wind wheel member 34 is positioned and connected to the first outer shell 1 through a mounting bracket. There is a heat conduction distance between the positioned and connected wind wheel member 34 and the first heating element 2, and their positions are relatively fixedly arranged; the mounting bracket extends along the radial direction of the first outer shell 1. The axis of the blades of the wind wheel member 34 corresponds to the first heating element 2. The heat conduction distance between the wind wheel member 34 and the first heating element 2 is equal to the radius of the first outer shell 1. The extending direction of the mounting bracket is perpendicular to the outer diameter peripheral position of the first outer shell 1 and is set away from the first outer shell 1. The wind wheel member 34 is installed at the extending end position of the mounting bracket.
[0044] When the first heating element 2 is powered on and the first outer shell 1 is placed horizontally in the first working position, it shows that the wind wheel member 34 does not rotate and the color change is not obvious; when the first outer shell 1 is rotated by 90 degrees and arranged vertically in the second working position, it can show the situation that the wind wheel member 34 rotates and changes color significantly. Students analyze and infer whether heat convection occurs and the direction of heat convection is from bottom to top by observing the color change and rotation of the temperature-sensitive ink on the wind wheel member 34 at the top of the heat convection device.
[0045] The above is only the preferred embodiment of the present invention. For those skilled in the art of this technology, without departing from the implementation principle of the present invention, the above embodiments can still be modified, and the corresponding modification schemes should also be regarded as the protection scope of the present invention.
Claims
1. A heat transfer teaching demonstration device, characterized in that: The housing comprises a first hemispherical shell, wherein a plurality of positioning through holes are arranged at the outer diameter circumference of the first shell; a heat source is arranged on the housing, wherein the heat source comprises a first heating element arranged at the center of the first shell; and a thermochromic component is detachably arranged on the housing; Under the application of the first combination setting of the shell and the thermochromic component, during the heating process of the heat source, the thermochromic component shows a first display phenomenon of the heat conduction effect; the thermochromic component includes a metal strip coated with thermosensitive ink, and when the first combination setting is applied, at least one end of the metal strip is inserted into the positioning through hole, and the metal strip is contacted with the first heating element; and / or the thermochromic component includes a metal disk coated with thermosensitive ink, and when the first combination setting is applied, the metal disk is in contact with the first heating element, and the first heating element forms a support and positioning for the metal disk; And / or, the thermochromic component comprises a plurality of wooden strips coated with thermosensitive ink, each of the wooden strips is positioned and connected in the positioning through hole, and one end of each of the wooden strips is arranged along the radial direction of the first shell toward the first heating element; in the application of the second combination of the shell and the thermochromic component, during the heating process of the heat source, the thermochromic component shows a second display phenomenon of thermal radiation effect; And / or, the outer diameter periphery of the first shell is rotatably connected to the bracket assembly at both ends with a rotating shaft, the bracket assembly can be positioned and placed in a horizontal plane, the first shell can be flipped and rotated around the bracket assembly, the first shell can be flipped and rotated to a first working position in which the outer diameter periphery is arranged along a horizontal plane, and the first shell can be flipped and rotated to a second working position in which the outer diameter periphery is arranged along a vertical plane; the thermochromic assembly includes a wind wheel component coated with thermosensitive ink, the wind wheel component is positioned and attached to the first shell by an installation bracket, and there is a heat conduction distance between the positioned and attached wind wheel component and the first heating component, and the positions of the two are relatively fixed; under the application of the third combination setting of the shell and the thermochromic assembly, during the heating process of the heat source, the thermochromic assembly shows a third display phenomenon of thermal convection effect.
2. The teaching demonstration device according to claim 1, characterized in that: The first heating element comprises an electric heating sheet.
3. The teaching demonstration device according to claim 1, characterized in that: At least two positioning through holes are arranged along the diameter direction of the first shell. When the thermochromic component includes a metal strip coated with thermosensitive ink, the two ends of the metal strip are connected to the two positioning through holes arranged in the diameter direction, and the middle part of the metal strip is arranged in contact with the first heating element.
4. The teaching demonstration device according to claim 1, characterized in that: When the thermochromic component includes a metal disk, the outer periphery of the metal disk is radially connected to a support rod, one end of the support rod is inserted into the positioning through hole, and the first heating element and the support rod form a support and positioning for the metal disk.
5. The teaching demonstration device as claimed in claim 2, characterized in that: A plurality of positioning through holes are evenly spaced along the outer diameter periphery of the first shell; when the second combination is applied, the distance from one end of each wooden strip to the electric heating plate is the same.
6. The teaching demonstration device according to claim 1, characterized in that: When the third combination setting is applied, the mounting bracket is extended along the radial direction of the first shell, the blade axis of the wind wheel component is set corresponding to the first heat generating component, the heat conduction distance between the wind wheel component and the first heat generating component is equal to the radius of the first shell, the extension direction of the mounting bracket is perpendicular to the outer diameter peripheral position of the first shell and is set away from the first shell, and the wind wheel component is installed at the extension end position of the mounting bracket.
7. The teaching demonstration device according to any one of claims 1 to 6, characterized in that: It also includes a temperature measuring component, which includes a plurality of temperature detection end pieces and temperature sensors electrically connected to each of the temperature detection end pieces, and each temperature sensor is connected to a digital display device; at least two temperature detection end pieces are provided, and the temperature detection end pieces include metal clips, and each of the digital display devices is integrated and fixedly mounted on a bracket shell.