Improved knife switch

Abstract

The utility model relates to the technical field of knife switches, in particular to an improved knife switch, which comprises an insulating base and a plurality of wire outlet end connecting plates fixed on the front side of the upper end of the insulating base at equal intervals, the plurality of wire inlet end connecting plates are fixed at the rear side of the upper end of the insulating base at equal intervals, the moving contacts are fixed at the upper ends of the plurality of wire outlet end connecting plates, and the contact knives are rotatably mounted among the upper ends of the plurality of moving contacts. According to the utility model, an original knife switch structure is scientifically and rationally improved, the wire outlet end connecting plate and the wire inlet end connecting plate are provided with the external expansion ends, and the heat conduction layers are arranged among the insulating base, the wire outlet end connecting plate and the wire inlet end connecting plate, so that the conductive sectional area is increased, and the heat conduction efficiency is improved. The heat conduction and heat dissipation efficiency of the wire inlet and outlet end is further improved, the reliability of the electric contact performance of the wire inlet and outlet end is ensured, the abnormal temperature rise problem in the working process of the knife switch is reduced, and the service life of the knife switch is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of knife switch technology, and in particular to an improved knife switch. Background Technology

[0002] A knife switch, also known as a knife gate, is generally used in AC or DC low-voltage (not exceeding 500V) circuits that do not require frequent switching on and off. Its operating current must not exceed the rated value under rated voltage. On machine tools, knife switches are mainly used as power switches; they are generally not used to connect or disconnect the motor's operating current.

[0003] like Figure 3 As shown, the previous generation knife switch structure has the following shortcomings in actual use: insufficient contact area at the input and output terminals of the knife switch (insufficient conductive cross-sectional area) causes unreliable wire connection and heat generation, resulting in excessive temperature rise of the knife switch itself, which directly affects the safety and stability of the knife switch in actual use.

[0004] Therefore, designing and manufacturing a knife switch that can increase the conductive cross-sectional area and reduce the occurrence of temperature rise is particularly important in the design, manufacturing and practical use of knife switches. Utility Model Content

[0005] The purpose of this utility model is to solve the problem of insufficient contact area at the input and output terminals of the previous generation of knife switches, which caused the wire connection to overheat easily, and to propose an improved knife switch.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An improved knife switch includes an insulating base, multiple outgoing terminal connecting plates equidistantly fixed to the front side of the upper end of the insulating base, multiple incoming terminal connecting plates equidistantly fixed to the rear side of the upper end of the insulating base, moving contacts fixed to the upper ends of the multiple outgoing terminal connecting plates, contact blades rotatably mounted between the upper ends of the multiple moving contacts, an insulating crossbeam mounted between the free ends of the multiple contact blades, a handle mounted on the middle of the outer side of the insulating crossbeam, and a stationary contact fixed to the upper end of the incoming terminal connecting plate and engaging with the contact blade. The upper ends of both the outgoing terminal connecting plates and the incoming terminal connecting plates are fixedly connected with wire bolts for wire connection. An improved section for enhancing the electrical contact performance of the circuit and reducing the temperature rise of the circuit is provided between the insulating base, the outgoing terminal connecting plates, and the incoming terminal connecting plates.

[0008] As a further description of the above technical solution:

[0009] The improved part includes an extended end integrally fixed to the outgoing end connecting plate and the incoming end connecting plate near the fixing bolt, and a heat-conducting layer filled between the insulating base, the outgoing end connecting plate and the connecting part of the incoming end connecting plate.

[0010] As the further description of the above technical solution:

[0011] The shape of the outwardly expanded end is a circular structure, and the center of the outwardly expanded end is on the same vertical center line as the axis of the fixed wire bolt.

[0012] As the further description of the above technical solution:

[0013] The heat-conducting layer is made of heat-conducting silicone grease material.

[0014] As the further description of the above technical solution:

[0015] The moving contact includes a wire outlet connecting block vertically welded and fixed on the upper end of the wire outlet connecting plate, and two first baffle plates symmetrically riveted on both ends of the wire outlet connecting block, and the upper ends of the two first baffle plates are rotationally connected with the contact blade through a limiting bolt.

[0016] As the further description of the above technical solution:

[0017] The stationary contact includes a wire inlet connecting block vertically welded and fixed on the wire inlet connecting plate, two contact sheets symmetrically riveted and fixed on both ends of the wire inlet connecting block, a spring plug integrally fixed on the upper ends of the two contact sheets and outwardly bent and distributed, and a second baffle plate riveted and fixed on the outer sides of the two contact sheets.

[0018] As the further description of the above technical solution:

[0019] The upper end of the insulating base is provided with a plurality of rectangularly distributed mounting holes.

[0020] As described above, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] In the utility model, the original knife switch structure is scientifically and rationally improved, the outwardly expanded ends are arranged on the wire outlet connecting plate and the wire inlet connecting plate, and the heat-conducting layer is arranged between the insulating base, the wire outlet connecting plate and the wire inlet connecting plate, so that the electric conduction cross-sectional area is increased, the heat conduction and heat dissipation of the wire inlet and outlet ends are further improved, the reliability of the electric contact performance of the wire inlet and outlet ends is ensured, the abnormal temperature rise problem in the working process of the knife switch is reduced, and the service life of the knife switch is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A structural schematic diagram of an improved knife switch is provided in the utility model;

[0023] Figure 2 A top view structural schematic diagram of the utility model is provided;

[0024] Figure 3 Figure 1 is a structural schematic diagram of a prior art last generation knife switch.

[0025] Legend:

[0026] 1, insulating base; 101, mounting hole; 2, outgoing line end connecting plate; 201, outgoing line connecting block; 202, first baffle; 3, incoming line end connecting plate; 301, incoming line connecting block; 302, contact piece; 303, spring plug; 304, second baffle; 4, contact knife; 401, insulating cross beam; 402, handle; 5, limiting bolt; 6, outwardly expanding end; 7, wire fixing bolt; 8, heat conducting layer. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0028] Please refer to Figures 1-3 The present application provides a technical solution: an improved knife switch, comprising an insulating base 1, a plurality of outgoing line end connecting plates 2 fixed equidistantly on the front side of the upper end of the insulating base 1, a plurality of incoming line end connecting plates 3 fixed equidistantly on the rear side of the upper end of the insulating base 1, a moving contact fixed on the upper end of the plurality of outgoing line end connecting plates 2, a contact knife 4 rotatably installed between the upper ends of the plurality of moving contacts, an insulating cross beam 401 installed between the free ends of the plurality of contact knives 4, a handle 402 installed on the middle of the outer side of the insulating cross beam 401, and a stationary contact fixed on the upper end of the incoming line end connecting plate 3 and engaged with the contact knife 4. The upper end of the outgoing line end connecting plate 2 and the incoming line end connecting plate 3 are both fixedly connected with a wire fixing bolt 7 for wire connection. An improved part for improving the electrical contact performance of the circuit and reducing the temperature rise of the circuit is arranged between the insulating base 1, the outgoing line end connecting plate 2 and the incoming line end connecting plate 3.

[0029] Specifically, as Figure 1 and Figure 2As shown, the improved part includes an integral fixing of the expanded end 6 of the outgoing terminal junction plate 2 and the incoming terminal junction plate 3 near one end of the wire fixing bolt 7 and a heat conducting layer 8 filled between the insulation base 1, the outgoing terminal junction plate 2 and the incoming terminal junction plate 3. The expanded end 6 is in a circular structure, and the center of the expanded end 6 is on the same vertical center line as the axis of the wire fixing bolt 7. This structure can make the contact area between the outgoing terminal junction plate 2 and the incoming terminal junction plate 3 and the wire fixing bolt 7 balanced, and when the conductor part of the wire is wound and fixed on the wire fixing bolt 7 on the outgoing terminal junction plate 2 or the incoming terminal junction plate 3, it can be in good contact, thereby ensuring the reliability of the incoming and outgoing terminal electrical contact performance of the knife switch.

[0030] At the same time, the heat conducting layer 8 is made of heat conducting silicone material, which improves the heat conducting effect of the heat conducting layer 8, can absorb local heat and quickly dissipate in the form of a surface, thereby accelerating the conduction of heat dissipation.

[0031] Specifically, as shown in Figures 1-3 The moving contact includes an outgoing terminal junction block 201 vertically welded and fixed on the upper end of the outgoing terminal junction plate 2 and two first baffles 202 symmetrically riveted on both ends of the outgoing terminal junction block 201, and the upper ends of the two first baffles 202 are connected with the knife blade 4 through the limiting bolt 5.

[0032] Specifically, as shown in Figures 1-3 The static contact includes an incoming terminal junction block 301 vertically welded and fixed on the incoming terminal junction plate 3, two contact sheets 302 symmetrically riveted and fixed on both ends of the incoming terminal junction block 301, a spring plug 303 integrally fixed on the upper ends of the two contact sheets 302 and outwardly bent and distributed, and a second baffle 304 riveted and fixed on the outer side of the two contact sheets 302.

[0033] Specifically, as shown in Figures 1-3 The upper end of the insulation base 1 is provided with a plurality of rectangularly distributed mounting holes 101, which facilitates the mounting and fixing operation of the insulation base 1 through fasteners.

[0034] Working principle: as Figure 3As shown, the original outgoing terminal connecting plate 2 and the incoming terminal connecting plate 3 are both in long strip structure, which results in limited conductive cross-sectional area between the outgoing terminal connecting plate 2 and the wire fixing bolt 7 and between the incoming terminal connecting plate 3 and the wire fixing bolt 7. When the conductor part of the wire is fixed on the outgoing terminal connecting plate 2 or the incoming terminal connecting plate 3 through the wire fixing bolt 7, the outgoing terminal connecting plate 2 and the incoming terminal connecting plate 3 cannot be in good contact with the wire part, which leads to the abnormal temperature rise of the internal circuit of the knife switch. The application sets the circular expanded end 6 on the outgoing terminal connecting plate 2 and the incoming terminal connecting plate 3 close to one end of the wire fixing bolt 7, and the center of the expanded end 6 and the axis of the wire fixing bolt 7 are on the same vertical center line, which can make the wire part in stable contact with the power connection part of the outgoing terminal connecting plate 2 and the incoming terminal connecting plate 3, effectively reducing the occurrence of the abnormal temperature rise of the internal circuit of the knife switch. Meanwhile, the heat-conducting silicone grease is filled between the connecting part of the insulating base 1, the outgoing terminal connecting plate 2 and the incoming terminal connecting plate 3, which can efficiently conduct the heat absorbed by the outgoing terminal connecting plate 2 and the incoming terminal connecting plate 3 in the form of surface and efficiently conduct the heat to the side of the insulating base 1 or the outgoing terminal connecting plate 2 and the incoming terminal connecting plate 3, so as to accelerate the heat dissipation of the outgoing terminal connecting plate 2 and the incoming terminal connecting plate 3.

[0035] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An improved knife switch comprising an insulating base (1), a plurality of outgoing terminal junction plates (2) fixed equidistantly on the front side of the upper end of the insulating base (1), a plurality of incoming terminal junction plates (3) fixed equidistantly on the rear side of the upper end of the insulating base (1), moving contacts fixed on the upper end of the plurality of outgoing terminal junction plates (2), a knife blade (4) rotatably installed between the upper ends of the plurality of moving contacts, an insulating crossbeam (401) installed between the free ends of the plurality of knife blades (4), a handle (402) installed in the middle of the outer side of the insulating crossbeam (401), and a stationary contact fixed on the upper end of the incoming terminal junction plate (3) and engaged with the knife blade (4), characterized in that, The upper end of the outgoing line terminal junction plate (2) and the incoming line terminal junction plate (3) is fixedly connected with a wire fixing bolt (7) for wire connection, and a modified part for improving circuit electrical contact performance and reducing circuit temperature rise is arranged between the insulating base (1), the outgoing line terminal junction plate (2) and the incoming line terminal junction plate (3).

2. The improved knife switch according to claim 1, wherein The modified part comprises an expanded end (6) integrally fixed to the outgoing line terminal junction plate (2) and the incoming line terminal junction plate (3) near one end of the wire fixing bolt (7) and a heat conduction layer (8) filled between the connecting part of the insulating base (1), the outgoing line terminal junction plate (2) and the incoming line terminal junction plate (3).

3. The improved knife switch according to claim 2, wherein The expanded end (6) is in a circular structure, and the center of the expanded end (6) is on the same vertical center line as the axis of the wire fixing bolt (7).

4. The improved knife switch as claimed in claim 2, wherein The heat conduction layer (8) is made of heat-conducting silicone grease material.

5. The improved knife switch as claimed in claim 1, wherein The moving contact comprises an outgoing line junction block (201) vertically welded and fixed on the upper end of the outgoing line terminal junction plate (2) and two first baffle plates (202) symmetrically riveted on both ends of the outgoing line junction block (201), and the two first baffle plates (202) are rotatably connected with the contact knife (4) through a limiting bolt (5) between the upper ends of the two first baffle plates (202).

6. The improved knife switch as claimed in claim 1, wherein The fixed contact comprises an incoming line junction block (301) vertically welded and fixed on the incoming line terminal junction plate (3), two contact sheets (302) symmetrically riveted and fixed on both ends of the incoming line junction block (301), a spring plug (303) integrally fixed on the upper ends of the two contact sheets (302) and outwardly bent and distributed, and a second baffle plate (304) riveted and fixed on the outer side of the two contact sheets (302).

7. The improved knife switch as claimed in claim 1, wherein The upper end of the insulating base (1) is provided with a plurality of rectangularly distributed mounting holes (101).

Images