CN220065007U - Demonstration teaching aid for searching circuit fuse - Google Patents

Abstract

The utility model provides a demonstration teaching aid for searching a circuit fuse, which comprises a base plate (100), wherein two power connectors (10) are arranged on the base plate (100), a loop is formed between the two power connectors (10), a master control switch (20), an ammeter (30) and a short circuit switch (50) are sequentially connected in series on the base plate, two crocodile clips (40) and a plurality of groups of electric element loops (60) are arranged between the master control switch (20) and the short circuit switch (50), and the plurality of groups of electric element loops (60) are connected in parallel; a plurality of connection joints (70) for connecting the fuse and the electric furnace wire (71) are arranged on the bottom plate (100). The demonstration teaching aid can be used for completing the exploration of the cause of overlarge current in a circuit, realizing the selection of fuse materials aiming at different use elements, further effectively improving the teaching efficiency and ensuring the teaching safety.

Description

Demonstration teaching aid for searching circuit fuse

Technical Field

The utility model relates to the technical field of teaching aids, in particular to a demonstration teaching aid for searching a circuit fuse.

Background

In daily life, all industries are not separated from electricity. In a household circuit, the number of electronic products, equipment and the like is large, the use frequency is high, the excessive current in the circuit is easy to cause, and potential safety hazards of the circuit are easy to occur; the fuse, which is used as a 'fuse link' with overload protection function in the circuit, can be automatically fused when the current is abnormally increased, so that the current is cut off, and the circuit is protected from running safely. The Chinese patent document CN202711551U discloses a fuse action demonstration teaching aid, which can intuitively understand the action of the fuse through demonstration of the teaching aid and is helpful for learning the action of the fuse; however, the materials, thickness and the like of the fuse are different according to different circuit conditions, and the demonstration teaching aid only performs demonstration of fuse fusing effect and does not realize demonstration of fuse material search, so that students cannot intuitively know which materials and what thickness degree are more suitable for manufacturing the fuse, further teaching and experiments cannot be performed, and teaching efficiency is reduced.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model aims to provide a demonstration teaching aid for searching a circuit fuse, which can finish the research of the cause of overlarge current in a circuit, can realize the selection of fuse materials aiming at different use elements, realize the more visual and intuitive understanding and learning of the fuse by students and improve the teaching efficiency and the safety coefficient of teaching.

The aim of the utility model is achieved by the following technical scheme:

a demonstration teaching aid for searching a circuit fuse is characterized in that: the circuit comprises a bottom plate, wherein a positive power connector and a negative power connector are arranged on the bottom plate, a loop is formed between the two power connectors, a master control switch, an ammeter and a short circuit switch are sequentially connected in series on the circuit, two crocodile clamps and a plurality of groups of electric element loops are arranged between the master control switch and the short circuit switch, and the plurality of groups of electric element loops are connected in parallel; the bottom plate is provided with a plurality of connecting joints, wherein an electric furnace wire is arranged between two connecting joints, and fuses of different materials are arranged between the other connecting joints.

As an optimization scheme of the utility model, the bottom plate is arranged on the insulating base, so that the bottom plate is made of insulating materials while the bottom plate is fixed and electric leakage is avoided.

As an optimization scheme of the utility model, the power connector is respectively connected with the positive electrode and the negative electrode of external direct current power supply equipment, so that the power supply of the whole circuit is realized.

As an optimization scheme of the utility model, two ends of the ammeter are connected in parallel with a shunt, and the shunt is used for protecting the ammeter.

As an optimization scheme of the utility model, the power consumption element loop comprises a shunt switch and halogen lamps, and different power halogen lamps are adopted among a plurality of groups of power consumption loops.

As an optimization scheme of the utility model, the power of the halogen lamp is 10-60W.

As an optimization scheme of the utility model, the number of the connecting joints is eleven, the eleven connecting joints are divided into four groups, and one group is two connecting joints connected with the electric furnace wire; the remaining nine connection joints are equally divided into three groups (i.e. each group comprises three connection joints) and fuses of different materials are arranged between two adjacent connection joints.

The utility model has the following technical effects:

according to the utility model, the electric stove wire is added as a special wire and is matched with the arrangement of the crocodile clip and the ammeter, so that the conclusion of overlarge current in the circuit can be effectively and intuitively obtained by utilizing the redness degree of the electric stove wire and the number of the ammeter; meanwhile, through the arrangement of a short-circuit switch, the switching of whether the short circuit exists in a loop is realized, and the power during the short circuit is intuitively obtained by matching with a special wire and matching with the arrangement of an alligator clip and an ammeter. Through the setting of attach fitting and crocodile clamp, can carry out the selection of fuse material, thickness degree when electric current is too big or short circuit, firstly be convenient for the teaching, improve teaching efficiency, secondly be favorable to the selection demonstration of fuse material, ensure to seek more suitable fuse. In addition, through the arrangement of the loops of the electric elements of each group, the electric elements can be added in real time, the circuit load is increased, and further, the exploration and the matching of the fuses can be adaptively carried out, so that the method is close to actual life.

Drawings

Fig. 1 is a schematic structural diagram of a demonstration teaching aid in an embodiment of the utility model.

Wherein, 100, the bottom plate; 10. a power supply connector; 20. a master control switch; 30. an ammeter; 31. a shunt; 40. crocodile clips; 50. a short-circuit switch; 60. a power element loop; 61. a shunt switch; 62. a halogen lamp; 70. a connection joint; 71. an electric stove wire; 72. copper wires; 73. fine lead-antimony alloy wire; 74. a nichrome wire; 75. crude lead-antimony alloy wire.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Examples

As shown in fig. 1: a demonstration teaching aid for searching a circuit fuse is characterized in that: the base plate 100 is arranged on an insulating base, so that electric leakage is avoided while the base plate 100 is fixed, and the base plate 100 is made of insulating materials. The base plate 100 is provided with a positive power connector 10 and a negative power connector 10 (as shown in fig. 1, the upper side is a positive power connector 10, and the lower side is a negative power connector 10), and the two power connectors 10 are respectively connected with the positive pole and the negative pole of an external direct current power supply device, so that the power supply of the whole circuit is realized, and in the embodiment, the 10V external direct current power supply device is adopted. A loop is formed between the two power connectors 10, and a master control switch 20, an ammeter 30 and a short-circuit switch 50 are sequentially connected in series on the loop, and two ends of the ammeter 30 are connected in parallel with a current divider 31 for protecting the ammeter 30. Two crocodile clamps 40 and a plurality of groups of electric element loops 60 are arranged between the main control switch 20 and the short circuit switch 50 (as shown in figure 1, a circuit break is formed on a certain loop between the main control switch 20 and the short circuit switch 50, two crocodile clamps 40 are respectively arranged at two ends of the circuit break), the plurality of groups of electric element loops 60 are mutually connected in parallel, as shown in figure 1, four groups of electric element loops 60 are arranged in the embodiment, and a first electric loop, a second electric loop, a third electric loop and a fourth electric loop are sequentially arranged from left to right; the power consumption element circuit 60 includes a shunt switch 61 and halogen lamps 62, and the halogen lamps 62 with different powers are adopted among the multiple groups of power consumption circuits 60, for example, the power of the halogen lamps 62 in the first power consumption circuit is 50W, the power of the halogen lamps 62 in the second power consumption circuit is 35W, the power of the halogen lamps 62 in the third power consumption circuit is 25W, and the power of the halogen lamps 62 in the fourth power consumption circuit is 20W in the present embodiment.

The base plate 100 is provided with a plurality of connection joints 70, specifically: the number of the connection joints 70 in the present embodiment is eleven, and the eleven connection joints 70 are divided into four groups, as shown in fig. 1: the first group of fuses, the second group of fuses, the third group of fuses and the electric furnace wire 71 are arranged from top to bottom in sequence, the first group of fuses, the second group of fuses and the third group of fuses adopt three connecting joints 70 respectively, the electric furnace wire 71 adopts two connecting joints 70, copper wires 72 and fine lead-antimony alloy wires 73 are respectively arranged between adjacent connecting joints 70 of the first group of fuses, nichrome wires 74 and fine lead-antimony alloy wires 73 are respectively arranged between adjacent connecting joints 70 of the second group of fuses, and copper wires 72 and coarse lead-antimony alloy wires 75 are respectively arranged between adjacent connecting joints 70 of the third group of fuses (the diameter of the coarse lead-antimony alloy wires 75 is not smaller than twice the diameter of the fine lead-antimony alloy wires 73). The connection terminal 70 is made of a conductive material, and is different from the fuse.

Meanwhile, the connection between the circuit elements in this embodiment is performed by using wires, except as otherwise specified in this embodiment.

When the electric wire heating device is used, the main switch is closed firstly, meanwhile, the two crocodile clips 40 respectively clamp the two connecting joints 70 of the electric wire 71, the short-circuit switch 50 is opened, any shunt switch 61 is closed, the external direct-current power supply equipment is started to electrify, and the overload degree is intuitively obtained by observing the heating degree of the electric wire 71 and the indication number of the ammeter 30; thereafter, the short-circuit switch 50 is closed, and the phenomenon at the time of short-circuit is visually observed by observing the degree of heat generation of the wire 71 and the indication of the ammeter 30. Then, the external direct-current power supply equipment is disconnected, the crocodile clip 40 is respectively connected with the two-end connecting connectors 70 of the first group of fuses, the second group of fuses and the third group of fuses (namely, the middle common connector is not connected with the crocodile clip 40), the same shunt switch 61 is closed, and the fusing condition of the fuses of various materials is respectively observed when overload is conducted; when the short-circuit switch is closed, the fuse of various materials is respectively electrified and observed during short-circuit, and finally, whether overload condition or short-circuit condition is observed, the fuse of the fine lead-antimony alloy wire 73 is realized, so that the fine lead-antimony alloy wire 73 can be preferably used as the fuse. Meanwhile, the demonstration teaching aid of the embodiment can also explore the corresponding bearing capacity of each metal wire with different thickness, namely the wattage of the electric element, so that more accurate fuse data can be obtained.

Claims (6)

1. A demonstration teaching aid for searching a circuit fuse is characterized in that: the electric energy meter comprises a bottom plate (100), wherein a positive power connector (10) and a negative power connector (10) are arranged on the bottom plate (100), a loop is formed between the two power connectors (10), a master control switch (20), an ammeter (30) and a short circuit switch (50) are sequentially connected in series, two crocodile clamps (40) and a plurality of groups of electric element loops (60) are arranged between the master control switch (20) and the short circuit switch (50), and the plurality of groups of electric element loops (60) are connected in parallel; a plurality of connecting joints (70) are arranged on the bottom plate (100), wherein a wire heater (71) is arranged between two connecting joints (70), and fuses of different materials are arranged between the other connecting joints (70).

2. The demonstration teaching aid for searching for a circuit fuse according to claim 1, wherein: the bottom plate (100) is disposed on an insulating base.

3. A demonstration teaching aid for searching for a circuit fuse according to claim 1 or 2 and characterized in that: the power connector (10) is respectively connected with the positive electrode and the negative electrode of external direct current power supply equipment.

4. The demonstration teaching aid for searching for a circuit fuse according to claim 1, wherein: and two ends of the ammeter (30) are connected with a shunt (31) in parallel.

5. The demonstration teaching aid for searching for a circuit fuse according to claim 1, wherein: the power consumption element loop (60) comprises a shunt switch (61) and halogen lamps (62), and different power halogen lamps (62) are adopted among a plurality of groups of power consumption loops (60).

6. The demonstration teaching aid for searching for a circuit fuse according to claim 1, wherein: the number of the connecting joints (70) is eleven, the eleven connecting joints (70) are divided into four groups, and one group is two connecting joints (70) connected with the electric furnace wire (71); the remaining nine connection joints (70) are equally divided into three groups, and fuses of different materials are arranged between two adjacent connection joints (70).