Can the high sensitivity rheostat of fast coolingTechnical field
The utility model relates to a kind of electrical device, and particularly relating to can the high sensitivity rheostat of fast cooling.
Background technology
Slide rheostat changes the resistance of self by the position of mobile slide plate, namely can protective circuit, can change again the size of current in circuit, thus to change electrical appliance both end voltage size be a critical elements in circuit.But as resistance, rheostat in use for some time, can produce fever phenomenon, and rheostatic unit resistance can change along with the change of temperature, has a strong impact on rheostatic sensitivity; The heat radiating type slide rheostat that prior art proposes, effect or undesirable.
Summary of the invention
Main purpose of the present utility model is for prior art Problems existing, and propose a kind of highly sensitive can the high sensitivity rheostat of fast cooling.
In order to achieve the above object, the technical solution of the utility model is as follows:
Rheostat involved by the utility model comprises two bracing frames, insulator, slide bar and heat abstractors; Described insulator and slide bar are arranged between two bracing frames, the described insulator screw be arranged on outside bracing frame is fastenedly connected, described slide bar passes the upper end of support frame as described above and is fixed, described insulator is hollow structure, described heat abstractor is one group of crisscross fin, described fin is placed in described insulator, described insulator is also provided with the louvre running through insulator surface.
Described slide bar is socketed with contact slide plate.
The two ends of described slide bar are upper binding post.
The lower end outside of described bracing frame is provided with lower binding post.
Described louvre is arrangement of evenly gathering.
Described lower binding post is connected with described resistance solenoid.
The beneficial effects of the utility model are: the utility model by arranging the mode of radiator in coil insulator, and the temperature that can well control slide rheostat is in room temperature all the time, and the unit resistance variable quantity of slide rheostat is little, and sensitivity is higher.
Accompanying drawing explanation
Fig. 1 is front view of the present utility model;
Fig. 2 is end view of the present utility model;
Wherein: 1 is bracing frame, 2 is louvre, and 3 is lower binding post, and 4 is screw, and 5 is upper binding post, and 6 is insulator, and 7 is slide bar, and 8 is contact slide plate, and 9 is fin.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further:
As shown in Figure 1-2, the rheostat involved by the utility model comprises two bracing frames 1, insulator 6, slide bar 7 and heat abstractor, insulator 6 and slide bar 7 are arranged between two bracing frames 1, slide bar 7 is socketed with contact slide plate 8, insulator 6 screw 4 be arranged on outside bracing frame 1 is fastenedly connected, slide bar 7 passes the upper end of support frame as described above 1 and is fixed, the two ends of slide bar 7 are upper binding post 5, insulator 6 is hollow structure, heat abstractor is one group of crisscross fin 9, fin 9 is placed in described insulator 6, insulator 6 is also provided with the louvre 2 running through insulator 6 surface, louvre 2 is arrangement of evenly gathering, insulator 6 outer surface is wound with resistance solenoid, the lower end outside of bracing frame 1 is provided with lower binding post 3, lower binding post 3 is connected with described resistance solenoid.
The present embodiment by arranging the mode of radiator in coil insulator, and the temperature that can well control slide rheostat is in room temperature all the time, and the unit resistance variable quantity of slide rheostat is little, and sensitivity is higher.