CN204230195U - Fuse assembly - Google Patents

Abstract

The utility model relates to a kind of fuse assembly, and it comprises the insulating body electrical module of fuse assembly being carried out to sealing, and the outer surface of insulating body has ground plane.The purpose of this utility model is to provide a kind of can reduce the spacing with other electric component, the miniaturized and fail safe by switch cubicle, the fuse assembly that connection reliability is strong.

Description

Fuse Assembly

technical field

The utility model relates to a fuse assembly.

Background technique

In recent years, the miniaturization of switchgear is a research hotspot in the industry. At present, most of the domestic 10kV switchgears are made of fixed modules connected by busbars, and the air distance is strictly implemented according to 125mm, so the cabinets are large in size and the use environment is also limited; while most of the miniaturized switchgears use the air-filled cabinet solution to meet the reduction of phases And the relative insulation distance. Since the charged SF6 gas is a greenhouse gas, it is not a promotional product. In order to make up for the shortcomings of SF6 inflatable cabinets such as greenhouse effect and easy air leakage, as well as the shortcomings of large footprint of air-insulated switchgear. At present, it is necessary to develop a new type of switchgear, which can not only meet the requirements of miniaturization, but also meet the requirements of environmental protection without using greenhouse gases.

Contents of the invention

The purpose of the utility model is to provide a fuse assembly that can reduce the distance with other electrical components, miniaturize the switchgear, and have high safety and connection reliability.

The purpose of this utility model is achieved through the following technical solutions:

A fuse assembly, which includes an insulating base body that seals the electrical module of the fuse assembly, and the outer surface of the insulating base body is coated with a grounding layer.

Compared with the prior art, the utility model has the advantages of:

1. Some parts of the electrical module of the fuse assembly are injection molded at one time through insulating materials such as epoxy resin, and the outer surface of the insulating matrix composed of insulating materials is coated with a grounding layer to achieve uniform electric field shielding and reliable grounding. , increase the safety and reliability of personal and equipment operation, and its appearance can be directly touched, and make the two-phase fuse insulation base can be close together without reducing the insulation between phases, and the distance between phases is reduced to the limit, so that the fuse assembly and other electrical components can be separated The spacing, the safe insulation distance between phases inside the switchgear and to the ground are greatly shortened, effectively reducing the volume of the switchgear;

2. The fuse assembly can be used in places with harsh environments, and the switch cabinet is truly maintenance-free;

3. The fuse assembly does not emit any toxic substances and greenhouse gases during use, and fully meets environmental protection requirements;

4. The interface size of the conical butt joint of the fuse assembly is highly versatile, and the existing general connectors can be conveniently used for electrical connection and ensure reliable connection with other electrical components;

5. The modular design can reduce the number of molds most reasonably, improve product versatility, and facilitate combination and connection.

Description of drawings

Fig. 1 is a three-dimensional structure diagram of an embodiment of the utility model in use state.

Figure 2 is a schematic side view of the embodiment of Figure 1 .

Fig. 3 is a schematic sectional view of the embodiment in Fig. 1 .

Fig. 4 is a schematic sectional view of a working state of the fuse assembly.

Fig. 5 is a schematic sectional view of another working state of the fuse assembly.

Explanation of symbols: 1 main switch assembly, 110 operating mechanism, 2 fuse assembly, 21 insulating substrate, 211 fuse chamber, 212 butt joint insertion chamber, 213 threaded connector accommodation chamber, 214 elastic insulating plug, 215 Plug fixing piece, 216 connection cavity, 217 conical butt joint, 22 grounding layer, 23 fuse unit, 231 conductive shield seat for incoming line, 2311 shielding convex edge, 232 conductive joint for incoming line, 233 fuse, 234 outgoing line Conductive shielding seat, 2341 shielding convex edge, 2342 shielding convex edge, 235 outgoing conductive connector, 236 striker, 237 strap contact finger, 238 pair of connector conductive fixing seat, 24 grounding switch, 241 long conductive rod, 2411 live display shielding ring , 242 grounding rod, 243 elastic insulating plunger, 244 grounding end cap, 2441 fixed insert, 2442 conductive end, 2443 elastic conductive contact piece, 245 insulating connecting rod, 3 busbar components, 4 switch cabinets.

Detailed ways

Below in conjunction with description accompanying drawing and embodiment the utility model content is described in detail:

1 to 5 are schematic diagrams of an embodiment of a fuse assembly provided by the present invention.

A fuse assembly is characterized in that it includes an insulating base 21 that seals the electrical module of the fuse assembly 2 , and the outer surface of the insulating base 21 is coated with a grounding layer 22 . The insulating base 21 is generally made of solid insulating materials such as epoxy resin; the grounding layer 22 is generally a metal coating such as a zinc-sprayed layer. The outer surface of the insulating substrate 21 is reliably connected to the ground potential by coating with metal particles. The high-voltage conductor forms a voltage-equalizing electrode structure through reasonable design, and forms two potentials of high and low voltage with the external grounding layer 22, and passes through a certain thickness of solid insulation in the middle. The matrix forms a stable and reliable high voltage insulation. Therefore, the solid insulation design reduces the volume of the overall structure by 2/3 compared with the original air-type structure, and the insulation performance does not change due to the influence of altitude and other external environmental factors.

The fuse assembly 2 includes a fuse unit 23 disposed in the insulating matrix 21 and electrically connected to the main switch assembly 1 , and a grounding switch 24 disposed in the insulating matrix 21 and electrically connected to the fuse unit 23 .

The insulating base 21 is provided with a fuse cavity 211 for accommodating the fuse unit 23; The incoming line conductive joint 232 in the line conductive shielding seat 231 and electrically connected to the incoming line conductive shielding seat 231, the fuse 233 inserted into the incoming line end and the incoming line conductive joint 232, located at the outlet end of the fuse 233 and embedded in the fuse The outgoing line conductive shielding seat 234 on the wall of the cavity 211, the outgoing line conductive joint 235 sleeved outside the outgoing line end of the fuse 233 and electrically connected to the outgoing line conductive shielding seat 234, and the outgoing line end of the fuse 233 are matched correspondingly and the fuse cavity is closed The impactor 236 of the outer port of 211. If the fuse 233 is blown, the striker in the middle of the striker 236 will pop out quickly and drive the operating mechanism 110 to trip so that the load switch or the circuit breaker 14 is opened.

In order to facilitate the installation and maintenance of the fuse 233, between the incoming conductive connector 232 and the incoming terminal of the fuse 233, between the outgoing conductive connector 235 and the outgoing terminal of the fuse 233, and between the outgoing conductive connector 235 and the outgoing conductive shielding seat 234 All are electrically connected through the strap contact fingers 237 .

In order to improve the shielding effect, reduce tip discharge and make the electric field more uniform, the edges of the incoming line conductive joint 232 and the outgoing line conductive joint 235 are smooth rounded corners. The outer edge of the front end of the outgoing line conductive shielding seat 234 and the rear end outer edge of the outgoing line conductive shielding seat 234 are all provided with shielding convex edges 2311, 2341, 2342 with smooth appearance, and the conductive shielding seat 231 of the incoming line and the conductive shielding seat 234 of the outgoing line The edges are smooth and rounded to avoid gaps between the insulating base 21 and the incoming conductive shielding seat 231 or the outgoing conductive shielding seat 234 when pouring the insulating matrix 21 .

The fuse unit 23 also includes a butt joint conductive fixing seat 238 electrically connected to the incoming line conductive shielding seat 231 and embedded in the insulating matrix 21; the insulating matrix 21 is located at both ends of the butt joint conductive fixing seat 238 A butt joint insertion cavity 212 and a threaded connector accommodating cavity 213 are respectively provided. The conical butt joint of the main switch assembly is inserted into the butt joint insertion cavity 212, and the threaded connector is inserted into the threaded connector accommodating cavity 213 and passed through the butt joint conductive fixing seat 238 to embed the conical pair of the main switch assembly. The conductive rod in the joint is connected and fixed to the conductive fixing seat 238 of the joint to form an electrical connection.

The threaded connector accommodating cavity 213 is filled and sealed by an elastic insulating plug 214, and the outer surface of the elastic insulating plug 214 is coated with a semiconductor conductive layer; the elastic insulating plug 214 is fixed by a plug fixing member 215, The plug fixing member 215 leans against the outer end of the elastic insulating plug 214 and is hooked and fixed outside the insulating base 21 . The elastic insulating plug 214 can play a good sealing and shielding effect on the connection part.

The front end of the insulating base 21 is provided with a connection part cavity 216 arranged side by side with the fuse unit 23; The long conductive rod 241, the grounding connecting rod 242 that passes through the cavity 216 of the connecting part and is movably connected in the long conductive rod 241, the elastic insulating plunger 243 that is sleeved outside the connecting rod 242, and is located in the cavity of the connecting part The grounding end cap 244 of the outer port of 216 and the insulating connecting rod 245 which is movable through the grounding end cap 244 and the elastic insulating plunger 243 and fixedly connected with the grounding connecting rod 242; The ground link 242 pulled by the link 245 makes the electrical connection. The grounding switch 24 is grounded synchronously with the main switch assembly 1 driven by the operating mechanism 110 . When grounded, the insulating link 245 is pulled out to form a visible fracture.

The ground end cover 244 includes a fixed insert 2441 inlaid on the front wall surface of the connecting part cavity 216, a conductive terminal 2442 that is threadedly matched with the fixed insert 2441 and has a hole for the insulating connecting rod 245 to penetrate, and is provided on the insulating The connecting rod 245 passes through the elastic conductive contact piece 2443 in the hole and is electrically connected with the conductive terminal 2442; 2443 is electrically connected to the conductive terminal 2442 .

In order to extrude the air in the connecting portion cavity 216, the conductive terminal 2442 presses against the elastic insulating plunger 243; when the insulating connecting rod 245 is inserted into the elastic insulating plunger 243, the insulating connecting rod 245 and the elastic insulating plunger 243 For interference fit. The outer surface of the elastic insulating plunger 243 has a certain taper. When the insulating connecting rod 245 is inserted into the elastic insulating plunger 243, the part of the insulating rod 245 in contact with the elastic insulating plunger 243 has a certain taper, thereby realizing the insulation of the connecting rod 245. Interference fit with the elastic insulating plunger 243.

The end of the insulating base 21 located at the rear end of the long conductive rod 241 is a tapered butt joint 217 formed of a standard outer cone structure, and the outer surface of the tapered butt joint 217 is not coated with the grounding layer 22 . The bottom of the tapered butt joint 217 is provided with an annular convex edge 218 . A live display shielding ring 2411 surrounding the long conductive rod 241 and embedded in the insulating base 21 is provided at the joint between the tapered butt joint 217 and the main body of the insulating base 21 . Since the conical butt joint 217 adopts a standard outer conical structure, it can be easily connected and expanded with other electrical components (such as cable joints) as required. The annular convex edge 218 is disposed at the bottom of the conical butt joint 217 and close to the ground layer 22 , which acts to uniform the electric field at the junction of the ground layer 22 and the uncoated ground layer 22 . The charging display shielding ring 2411 is used to sense and obtain the capacitance signal to realize the function of detecting the charging situation.

As shown in Fig. 3, in order to ensure the convenient and reliable replacement of the fuse 233, the fuse unit 23 is installed in the fuse cavity 211 of the insulating base 21, and the outgoing conductive shielding seat 234 and the long conductive rod 241 are integrally formed during the casting process. The electrical connection and failure rate between the fuse unit 23 and the grounding switch 24 can be greatly reduced. The action of the grounding switch 24 is linked with the grounding station of the main switch assembly 1 to ensure that both ends of the fuse 233 are grounded at the same time when the fuse 233 is replaced. At the same time, it can also meet the requirement of having a visible fracture when the switchgear is closed and opened, and the safety and reliability are enhanced.

The electrical interface parts of the main switch assembly 1, the fuse assembly 2 and the busbar assembly 3 all adopt a standard outer cone structure to facilitate electrical connection.

Claims (10)

1. a fuse assembly, it is characterized in that: it comprises the insulating body (21) electrical module of fuse assembly (2) being carried out to sealing, the outer surface of insulating body (21) has ground plane (12,22).

2. fuse assembly according to claim 1, is characterized in that: described fuse assembly (2) comprises to be located in insulating body (21) and the fuse unit (23) be electrically connected with main switch assembly (1) and being located in insulating body (21) and the earthed switch (24) be electrically connected with fuse unit (23).

3. fuse assembly according to claim 2, is characterized in that: described insulating body (21) offers the fuse cavity volume (211) of accommodating fuse unit (23), described fuse unit (23) comprises the inlet wire conductive shield seat (231) be embedded on the wall of fuse cavity volume (211) rear end, to be sheathed in inlet wire conductive shield seat (231) and the inlet wire conductive contact (232) be electrically connected with inlet wire conductive shield seat (231), the fuse (233) of end of incoming cables and inlet wire conductive contact (232) grafting, be positioned at fuse (233) leading-out terminal and be embedded in the outlet conductive shield seat (234) on fuse cavity volume (211) wall, be socketed on the outer and outlet conductive contact (235) be electrically connected with outlet conductive shield seat (234) of fuse (233) leading-out terminal and with fuse (233) leading-out terminal corresponding matching and the striker (236) of enclosed fuse cavity volume (211) external port.

4. fuse assembly according to claim 3, it is characterized in that: the rear end outward flange of the front end outward flange of described inlet wire conductive shield seat (231), the front end outward flange of outlet conductive shield seat (234) and outlet conductive shield seat (234) is equipped with the shielding convex edge (2311,2341,2342) of appearance fairing, and the edge of inlet wire conductive shield seat (231) and outlet conductive shield seat (234) is the fillet of fairing.

5. fuse assembly according to claim 3, is characterized in that: described fuse unit (23) also comprises and to be electrically connected with inlet wire conductive shield seat (231) and holder (238) is conducted electricity in the butt joint be embedded in insulating body (21); Described insulating body (21), its two ends being positioned at butt joint conduction holder (238) are arranged with butt joint plant chamber (212) and threaded connector containing cavity (213).

6. fuse assembly according to claim 5, it is characterized in that: described threaded connector containing cavity (213) carries out fill plug seal by elastic insulated plug (214), and the outer surface of elastic insulated plug (214) has semiconductor conducting layer; Described elastic insulated plug (214) is fixed by plug fixture (215), and described plug fixture (215) leans in the outer end of elastic insulated plug (214) and hook is fixed on insulating body (21) outward.

7. the fuse assembly according to claim 2-6 any one, is characterized in that: described insulating body (21) front end offers the connecting portion cavity volume (216) be arranged side by side with fuse unit (23), described earthed switch (24) comprises and to be electrically connected with the leading-out terminal of fuse unit (23) and the long conducting rod (241) that is connected with connecting portion cavity volume (216) rear end of front end, to be arranged in connecting portion cavity volume (216) and activity is connected to the ground connection connecting rod (242) in long conducting rod (241), be sheathed on ground connection connecting rod (242) elastic insulated plunger (243) outward, be positioned at the ground connection end cap (244) of connecting portion cavity volume (216) external port and be actively located in the insulated connecting rod (245) that ground connection end cap (244) is fixedly connected with elastic insulated plunger (243) and with ground connection connecting rod (242), during ground connection, ground connection end cap (244) and long conducting rod (241) are formed by the ground connection connecting rod (242) pulled by insulated connecting rod (245) and are electrically connected.

8. fuse assembly according to claim 7, is characterized in that: described ground connection end cap (244) comprise the fixing inserts (2441) be embedded on the wall of connecting portion cavity volume (216) front end, with fixing inserts (2441) be threaded coordinate and with the conduction termination (2442) and being located at of insulated connecting rod (245) perforating be electrically connected in insulated connecting rod (245) perforating and with conduction termination (2442) elastic conduction contact (2443); When ground connection connecting rod (242) is drawn out, ground connection connecting rod (242) is electrically connected with conduction termination (2442) by the elastic conduction contact (2443) leaned on ground connection connecting rod (242).

9. fuse assembly according to claim 7, it is characterized in that: described insulating body (21), its termination being positioned at long conducting rod (241) rear end is the taper butt joint (217) adopting normal formula outer cone Structure composing, the uncoated ground plane of outer surface (22) of taper butt joint (217).

10. fuse assembly according to claim 9, is characterized in that: described taper butt joint (217) is provided with around long conducting rod (241) with the junction of insulating body (21) main body and is embedded at the charged display shading ring (2411) in insulating body (21).