Multi-gear electric heater power demonstration device for teaching

Abstract

The utility model discloses a multi-gear electric heater power demonstration device for teaching, which belongs to the technical field of electric heater power demonstration, and comprises a box body, the upper end of the box body is fixedly connected with a mounting plate, the lower end of the box body is fixedly connected with a pair of mutually symmetrical supporting legs, and the front surface of the box body is provided with serially connected electric heating wires. The key points of the technical scheme are that a 24V low-voltage power supply and a low-temperature thermochromic material are adopted to supply power, the change condition of power of different gears is clearly presented on the premise of ensuring safety, the power is distinguished more intuitively and clearly through colors, and through the arrangement that the front side of a box body is provided with series heating wire demonstration and the back side is provided with parallel heating wire demonstration, the demonstration effect is better. Series connection and parallel connection are demonstrated separately, penetration and distinguishing can be performed more conveniently and visually, students can understand the demonstration more easily, meanwhile, the corresponding heating wires correspond to corresponding characters, and the demonstration difficulty is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heater power demonstration, and more specifically, to a multi-gear electric heater power demonstration device for teaching. Background Technique

[0002] A multi-gear electric heater power demonstration device is a teaching or experimental tool specifically used to intuitively display the power change of a multi-gear electric heater under different working conditions. It usually has an adjustable circuit structure. By switching different gears, the connection mode of the heating wire is changed, such as series connection, parallel connection or other combination forms, so as to realize the adjustment of the power size. The device can, in a more obvious way, such as through the heating degree, relevant indicators or measuring instruments, etc., enable users to clearly observe and understand the difference in the power of the electric heater under different gears and the underlying circuit principle.

[0003] However, the analysis of the circuit structure and power problem of a multi-gear electric heater is difficult for students. The traditional principle of a multi-gear electric heater realizes the power change by changing the series-parallel relationship of the heating wire. However, the traditional electric power teaching aid is connected to the circuit with a 220V voltage, and the heating phenomenon is obvious, but the voltage exceeds the safe voltage and it is easy to get scalded by high temperature. At the same time, by using a 24V low-voltage power supply and low-temperature thermochromic materials, the change of the power size of different gears is clearly presented on the premise of ensuring safety.

[0004] Therefore, a multi-gear electric heater power demonstration device for teaching is proposed to solve the above problems. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a multi-gear electric heater power demonstration device for teaching, which clearly presents the change of the power size of different gears on the premise of ensuring safety by using a 24V low-voltage power supply and low-temperature thermochromic materials.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions:

[0007] A multi-gear electric heater power demonstration device for teaching includes a box body. The upper end of the box body is fixedly connected with a mounting plate, the lower end of the box body is fixedly connected with a pair of symmetrically arranged supporting legs. A series of heating wires are installed on the front of the box body, a pair of thermochromic plates are installed on the front of the box body, a series power switch is installed on the front of the box body, a series working indicator light is installed on the front of the box body, and a series of marks are installed on the front of the box body.

[0008] In this scheme, R1 and R2 are heating wires, R3 is an LED lamp current-limiting resistor, LED is an indicator light, S1 is the main switch, S2 is the short-circuit switch of resistor R2, and DC12-24V is a DC power supply of 12V-24V.

[0009] Refer to Figures 4 - 5 As shown, a parallel-connected electric heating wire is installed on the back of the box body, a parallel-connected power switch and a parallel-connected working indicator light are installed on the back of the box body, a parallel-connected sign is also installed on the back of the box body, and a pair of thermochromic plates are also installed on the back of the box body;

[0010] In this solution, R1 and R2 are electric heating wires, R3 is an LED lamp current-limiting resistor, S is the main switch, S1 is the direct-circuit switch of R1, DC12 - 24V is a DC power supply of 12V - 24V, and there are physical diagrams and demonstration effects.

[0011] Refer to Figures 1 - 3 As shown, the front of the mounting plate is engraved with words for demonstrating the power of multi-stage electric heaters.

[0012] Refer to Figure 4 As shown, a handle is fixedly installed at the upper end of the box body.

[0013] Refer to Figures 1 - 3 As shown, the box body is powered by a 24V low-voltage power supply, and a low-temperature thermochromic material is used as the bottom plate of the electric heating wire.

[0014] Refer to Figures 1 - 3 As shown, the thermochromic plate is made of thermochromic materials with two temperatures of 31°C or 45°C.

[0015] Both the front and back of the box body are provided with two pairs of rubber joint jacks, and the thermochromic plate is connected to the middle of the box body through the rubber joint jacks;

[0016] In this solution, an electric heating wire with a diameter of 0.4mm is wound around the thermochromic panel, and both ends are connected to rubber plugs. The electric heating wire resistances in the two panels are different, being 16Ω and 24Ω respectively.

[0017] In summary, the present utility model has the following beneficial effects:

[0018] (1) By adopting a 24V low-voltage power supply and low-temperature thermochromic materials, this solution clearly presents the changes in power levels of different gears on the premise of ensuring safety, and it is more intuitive and clear to distinguish the power levels by color.

[0019] (2) Through the setting of series-connected electric heating wire demonstration on the front of the box body and parallel-connected electric heating wire demonstration on the back, this solution demonstrates series connection and parallel connection separately, making it more convenient and intuitive to penetrate them, and separating them makes it easier for students to understand. At the same time, the corresponding electric heating wires have corresponding words, further reducing the demonstration difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the connection structure between the front of the box body and the thermochromic plate in this embodiment;

[0021] Figure 2 It is a schematic diagram of the front structure of the box body in this embodiment;

[0022] Figure 3 It is a schematic diagram of the series electric heating wire circuit structure in this embodiment;

[0023] Figure 4 It is a schematic diagram of the back structure of the box body in this embodiment;

[0024] Figure 5 It is a schematic diagram of the parallel electric heating wire circuit structure in this embodiment.

[0025] In the figure, 1. Box body; 2. Mounting plate; 3. Support leg; 4. Series electric heating wire; 5. Thermochromic plate; 6. Series power switch; 7. Series working indicator light; 8. Series label; 9. Parallel electric heating wire; 10. Parallel power switch; 11. Parallel working indicator light; 12. Parallel label. Specific implementation mode

[0026] The following further details the present utility model in conjunction with the accompanying drawings.

[0027] Among them, the same parts are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0028] Refer to Figures 1 - 3 As shown, a multi - gear electric heater power demonstration device for teaching includes a box body 1. An installation plate 2 is fixedly connected to the upper end of the box body 1, a pair of symmetrically arranged support legs 3 are fixedly connected to the lower end of the box body 1. A series electric heating wire 4 is installed on the front of the box body 1, a pair of thermochromic plates 5 are installed on the front of the box body 1, a series power switch 6 is installed on the front of the box body 1, a series working indicator light 7 is installed on the front of the box body 1, and a series label 8 is installed on the front of the box body 1;

[0029] In this solution, R1 and R2 are electric heating wires, R3 is an LED lamp current - limiting resistor, LED is an indicator light, S1 is the main switch, S2 is the short - circuit switch for resistor R2, and DC12 - 24V is a DC power supply of 12V - 24V.

[0030] Refer to Figures 4 - 5 As shown, a parallel electric heating wire 9 is installed on the back of the box body 1, a parallel power switch 10 and a parallel working indicator light 11 are installed on the back of the box body 1, a parallel label 12 is also installed on the back of the box body 1, and a pair of thermochromic plates 5 are also installed on the back of the box body 1;

[0031] In this solution, R1 and R2 are heating wires, R3 is the current-limiting resistor for the LED lamp, S is the main switch, S1 is the direct-circuit switch for R1, DC12 - 24V is the DC power supply of 12V - 24V, and there are physical diagrams and demonstration effects.

[0032] Refer to Figures 1 - 3 As shown, the front of the mounting plate 2 is engraved with words for demonstrating the power of multi-stage electric heaters.

[0033] Refer to Figure 4 As shown, a handle is fixedly installed at the upper end of the box body 1.

[0034] Refer to Figures 1 - 3 As shown, the box body 1 is powered by a 24V low-voltage power supply, and a heat-sensitive discoloration material at a low temperature of about 30°C is used as the base plate of the heating wire.

[0035] Refer to Figures 1 - 3 As shown, the heat-sensitive discoloration plate 5 is made of heat-sensitive discoloration materials at two temperatures of 31°C or 45°C.

[0036] On both the front and back of the box body 1, two pairs of rubber joint jacks are provided, and the heat-sensitive discoloration plate 5 is connected to the middle of the box body 1 through the rubber joint jacks;

[0037] In this solution, a heating wire with a diameter of 0.4mm is wound around the heat-sensitive discoloration panel, and both ends are connected to rubber plugs. The resistance of the heating wires in the two panels is different, being 16Ω and 24Ω respectively.

[0038] Specific implementation process: It is powered by a 24V low-voltage power supply, and a heat-sensitive discoloration material at a low temperature of about 30°C is used as the base plate of the heating wire. The power level is reflected by the change in the color of the base plate when heated by the heating wire to the heat change temperature, without heating to red heat, safely and clearly presenting the power levels of different gears of the multi-stage electric heater. The heat-sensitive discoloration panel 5 is wound with a heating wire. A heating wire with a diameter of 0.4mm is wound around the heat-sensitive discoloration panel 5, and both ends are connected to rubber plugs. The resistance of the heating wires in the two panels is different, being 16Ω and 24Ω respectively. When in use, it is inserted into the rubber socket of the demonstration device. After the power is turned on, the heating wire generates heat to change the color of the heat-sensitive material, and the power level of the heating wire is reflected by the speed of color change, which reflects the speed of temperature rise. It is made of heat-sensitive discoloration materials at two temperatures of 31°C or 45°C, which are respectively suitable for demonstrating under different temperature conditions in winter and summer.

[0039] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-speed electric heater power demonstration device for teaching, comprising a box (1), characterized in that: The upper end of the box (1) is fixedly connected to a mounting plate (2), the lower end of the box (1) is fixedly connected to a pair of mutually symmetrical supporting legs (3), the front of the box (1) is installed with a series heating wire (4), the front of the box (1) is installed with a pair of thermochromic plates (5), the front of the box (1) is installed with a series power switch (6), the front of the box (1) is installed with a series working indicator light (7), and the front of the box (1) is installed with a series logo (8); The box (1) is powered by a 24V low-voltage power supply, and a low-temperature 30°C thermochromic material is used as the bottom plate of the heating wire.

2. A teaching multi-speed electric heater power demonstration device according to claim 1, characterized in that: A parallel heating wire (9) is installed on the back of the box (1), a parallel power switch (10) and a parallel working indicator light (11) are installed on the back of the box (1), a parallel logo (12) is also installed on the back of the box (1), and a pair of thermochromic panels (5) are also installed on the back of the box (1).

3. The teaching multi-stage electric heater power demonstration device according to claim 1, characterized in that: The front side of the mounting plate (2) is engraved with words showing the power demonstration of multiple electric heaters.

4. The teaching multi-stage electric heater power demonstration device according to claim 1, characterized in that: A handle is fixedly mounted on the upper end of the box body (1).

5. The teaching multi-stage electric heater power demonstration device according to claim 1, characterized in that: The thermochromic plate (5) is made of two thermochromic materials with a temperature of 31°C or 45°C.

6. The teaching multi-stage electric heater power demonstration device according to claim 1, characterized in that: Two pairs of rubber joint jacks are provided on the front and back of the box body (1), and the thermochromic plate (5) is connected to the middle of the box body (1) via the rubber joint jacks.

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