CN216133563U - Short circuit harm presentation device - Google Patents
Short circuit harm presentation device Download PDFInfo
- Publication number
- CN216133563U CN216133563U CN202122098183.3U CN202122098183U CN216133563U CN 216133563 U CN216133563 U CN 216133563U CN 202122098183 U CN202122098183 U CN 202122098183U CN 216133563 U CN216133563 U CN 216133563U
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- Prior art keywords
- short circuit
- polyvinyl chloride
- power
- small bulb
- core
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- 230000006378 damage Effects 0.000 title claims abstract description 8
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 24
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 9
- 238000005286 illumination Methods 0.000 claims abstract description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 abstract description 8
- 239000000779 smoke Substances 0.000 abstract description 4
- 230000000007 visual effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
A short circuit hazard demonstration device adopts a 500W step-down transformer to convert 220V illumination electricity into 12V low-voltage electricity, and obtains larger load capacity. The 12V low-voltage power supplies power to the small bulb with the rated voltage of 12V, the small bulb can normally emit light, and the normal state of the circuit is demonstrated. Then, two ends of the small bulb are connected in parallel with a section of polyvinyl chloride insulating single-core multistrand of 0.3mm2Flexible conductor forming short circuit state and showing little light emission of small bulb, polyvinyl chloride insulating single core and multiple strands of 0.3mm2The flexible conductor immediately heats, and after a plurality of seconds, the polyvinyl chloride insulating skin emits thick smoke to demonstrate the serious harm of short circuit. The experiment authenticity is strong, the phenomenon is visual and obvious, the operation is simple, the device can be used repeatedly, and the cost is low.
Description
Technical Field
The utility model relates to a physical teaching aid for middle schools, in particular to a demonstration experiment device capable of demonstrating short circuit hazards.
Background
Short-circuiting is an important concept in middle school physics. The damage of short circuit is mainly caused by fire hazard due to heating of circuit elements, and may damage the circuit elements. This is a difficult point for students who lack perceptual knowledge, so intuitive experiments are needed to support teaching. Teaching is supported by experimental schemes generally arranged in teaching materials, for example, in eight-grade books of science of Zhejiang education publishers, an experimental scheme that one lead is short-circuited with one dry battery is adopted, teachers make efforts in the teaching process, but most of the experimental results are poor, so that the experiment becomes a difficult experiment.
Disclosure of Invention
In order to overcome the experimental defects, the utility model provides the short circuit hazard demonstration device which can demonstrate the hazard of short circuit visually and effectively.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a step-down transformer with 500W rated power is adopted to convert 220V lighting power into 12V low-voltage power, and large load capacity is obtained. The 12V low-voltage power supplies power to the small bulb with the rated voltage of 12V, the small bulb can normally emit light, and the normal state of the circuit is demonstrated. Then, two ends of the small bulb are connected in parallel with a section of polyvinyl chloride insulating single-core multistrand of 0.3mm2Flexible conductor forming short circuit state and showing little light emission of small bulb, polyvinyl chloride insulating single core and multiple strands of 0.3mm2The flexible conductor immediately heats, thick smoke is emitted from the polyvinyl chloride insulating skin after a plurality of seconds, serious harm of short circuit is demonstrated, and the experimental phenomenon is visual and obvious.
The utility model has the beneficial effects that: firstly, the phenomenon is obvious, the visibility is high, the intuition is strong, and the impression of students is deep; secondly, a simulation substitute is not adopted, but practical circuit equipment is completely adopted, so that the authenticity of the experiment is strong; thirdly, the short circuit harm demonstration device is simple to operate, can be used repeatedly, and the experiment cost is low.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
Fig. 1 is a circuit schematic of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
In FIG. 1, S1Is a power switch, B is a fuse, T is a transformer with a rated power of 500W, S2Is a control switch, L is a small bulb, J1Is terminal 1, J2Is a binding post 2, W is a polyvinyl chloride insulating single-core multistrand 0.3mm2A flexible conductor.
In FIG. 2, 1 is the power line, 2 is the power switch S13, a power box, 4, a right wire outlet, 5, a left wire outlet, 6, a small bulb L, 7, a left binding post, 8, a left threading hole frame, 9, a polyvinyl chloride insulating single-core multistrand of 0.3mm2Flexible conductor, 10. right threading hole frame, 11. panel, 12. right binding post13. control switch S2。
Detailed Description
In FIG. 1, 220V illumination voltage is passed through a closed power switch S1And the fuse B reaches the primary coil of a transformer T with the rated power of 500W, and the secondary coil of the transformer T outputs low-voltage power of 12V. When controlling the switch S2Closure, J1Terminals 1 and J2The polyvinyl chloride insulating single-core multistrand of 0.3mm is not connected between the binding posts 22When the wire is soft, the small bulb L emits light normally to demonstrate the normal working state of the circuit; when controlling the switch S2Is closed and J1Terminals 1 and J2A polyvinyl chloride insulating single-core multistrand of 0.3mm is connected between the binding posts 22When the wire is flexible, the circuit is in short circuit state, the small bulb L hardly emits light, and the polyvinyl chloride insulating single-core multistrand is 0.3mm2The flexible conductor immediately heats, and after a plurality of seconds, the polyvinyl chloride insulating skin emits dense smoke to demonstrate the short circuit state of the circuit.
In the embodiment shown in fig. 2, the short circuit hazard demonstration device mainly comprises a panel (11) and a power supply box (3), wherein the panel (11) is made of fireproof insulating materials and is fixed on the front side surface of the power supply box (3). A small bulb L (6), a left binding post (7), a left threading hole frame (8) and a polyvinyl chloride insulating single-core multistrand of 0.3mm are arranged on the panel (11)2A flexible lead (9), a right threading hole frame (10), a right binding post (12) and a control switch S2(13) Etc. mainly used for demonstrating and presenting experimental phenomena, in particular to utilize a left threading hole frame (8) and a right threading hole frame (10) to insulate polyvinyl chloride with single core and multistrand of 0.3mm2The flexible lead (9) is suspended and connected in parallel at two ends of the small bulb L (6), which not only leads the polyvinyl chloride insulation single core multistrand to be 0.3mm2The connection relation of the flexible leads (9) is clear, and the experimental phenomenon of high visibility is facilitated. The left threading hole frame (8) and the right threading hole frame (10) are small supports with metal rings. A transformer T with the rated power of 500W and a fuse B are arranged in the power box (3), and a power switch S is arranged on the side wall of the power box (3)1(2) The power box (3) is externally connected with a power line (1). Rated power 500The 12V output end lead of the W transformer T adopts a polyvinyl chloride insulating single-core multistrand 2.5mm2The flexible lead passes through the right wire outlet hole (4) and the left wire outlet hole (5) to connect the left wiring terminal (7), the small bulb L (6), the right wiring terminal (12) and the control switch S on the panel (11)2(13) Are connected in series.
In the embodiment shown in fig. 2, further, the basic operation of the demonstration experiment is: the polyvinyl chloride insulating single-core multi-strand 0.3mm is not connected firstly2A flexible conductor (9) for connecting the power line (1) to a 220V lighting power socket and closing the power switch S1(2) The transformer T with the rated power of 500W works to output 12V low-voltage power, and then the control switch S is closed2(13) And the small bulb L (6) emits light normally to demonstrate the normal working state of the circuit. Switch off control switch S2(13) One section of polyvinyl chloride insulating single-core multistrand of 0.3mm2After the flexible lead (9) passes through the left threading hole frame (8) and the right threading hole frame (10), the polyvinyl chloride insulating single-core multistrand is 0.3mm2Core wires at two ends of the flexible lead (9) are connected in parallel at two ends of the small bulb L (6) through the left binding post (7) and the right binding post (12), and then the control switch S is closed2(13) Polyvinyl chloride insulating single-core multistrand 0.3mm2The flexible lead (9) immediately heats, and after a plurality of seconds, the polyvinyl chloride insulating skin emits dense smoke to demonstrate the short circuit state of the circuit.
Claims (3)
1. A short circuit harm presentation device, characterized by: from mains switch S1Fuse B, transformer T with 500W rated power and control switch S2Small bulb L and one section of polyvinyl chloride insulating single core multistrand of 0.3mm2The flexible conductor W forms a circuit, and 220V illumination voltage passes through a power switch S1And a primary coil of a transformer T with a fuse B reaching a rated power of 500W, a secondary coil outputting a low voltage via a control switch S2Reaches 0.3mm of multiple strands of single core insulated by small bulb L and polyvinyl chloride2And the flexible conducting wires W are connected in parallel to form a short-circuit unit.
2. The short circuit hazard demonstration apparatus of claim 1 wherein: the short circuit hazard demonstration device is composed of a panel (11) made of fireproof insulating materials and a power box (3).
3. The short circuit hazard demonstration apparatus of claim 1 wherein: a small bulb L (6), a left binding post (7), a left threading hole frame (8) and a polyvinyl chloride insulating single-core multistrand of 0.3mm are arranged on the panel (11)2A flexible lead (9), a right threading hole frame (10), a right binding post (12) and a control switch S2(13) A transformer T with 500W rated power and a fuse B are arranged in the power box (3), and a power switch S is arranged on the side wall of the power box (3)1(2) The power box (3) is externally connected with a power line (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122098183.3U CN216133563U (en) | 2021-09-01 | 2021-09-01 | Short circuit harm presentation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122098183.3U CN216133563U (en) | 2021-09-01 | 2021-09-01 | Short circuit harm presentation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216133563U true CN216133563U (en) | 2022-03-25 |
Family
ID=80772381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122098183.3U Expired - Fee Related CN216133563U (en) | 2021-09-01 | 2021-09-01 | Short circuit harm presentation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216133563U (en) |
-
2021
- 2021-09-01 CN CN202122098183.3U patent/CN216133563U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220325 |