Shell of miniature circuit breaker

Abstract

The utility model relates to a miniature circuit breaker shell, which comprises a bottom shell and an upper shell arranged on the bottom shell, a semicircular first raised line is arranged on the bottom shell corresponding to a wiring screw hole, a second raised line matched with the first raised line is arranged on the upper shell, the first raised line and the second raised line enclose to form an annular raised part, and the first raised line and the second raised line are connected with the bottom shell. The bottom shell and the upper shell are provided with locking buckle plates used for locking the first protruding strip and the second protruding strip, the locking buckle plates are provided with locking clamping holes matched with the protruding parts, and the protruding parts are clamped in the locking clamping holes to form clamping matching of the locking block buckle plates, the first protruding strip and the second protruding strip. The utility model has the advantages of simple structure, stable and reliable performance, and convenient assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a small circuit breaker. Background Art

[0002] Miniature circuit breakers, also known as miniature circuit breakers, are suitable for overload and short-circuit protection of AC 50 / 60Hz rated voltage 230 / 400V and rated current not exceeding 125A lines. They can also be used for infrequent operation conversion of lines under normal circumstances. Miniature circuit breakers are mainly used in various places such as industry, commerce, high-rise and residential buildings. Miniature circuit breakers include a shell, an operating mechanism, a moving contact, a static contact, an arc extinguishing system, and wiring terminals. The shell includes a bottom shell and an upper shell arranged on the bottom shell. The bottom shell and the upper shell of the existing miniature circuit breaker are riveted together by multiple rivets. When the miniature circuit breaker is connected, the wiring terminals are subjected to a large torque, and the bottom shell and the upper shell corresponding to the wiring terminals are easily stretched apart, resulting in unreliable working performance of the miniature circuit breaker. Summary of the invention

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a small circuit breaker housing with simple structure, stable and reliable performance and convenient assembly.

[0004] To achieve the above-mentioned purpose, the utility model adopts a small circuit breaker housing, including a bottom shell and an upper shell arranged on the bottom shell, a semi-circular first convex strip is arranged on the bottom shell corresponding to the wiring screw hole, a second convex strip matching with the first convex strip is arranged on the upper shell, the first convex strip and the second convex strip surround a circular convex portion, the bottom shell and the upper shell are provided with a locking buckle plate for locking the first convex strip and the second convex strip, a locking card hole matching with the convex portion is arranged on the locking buckle plate, the convex portion is engaged in the locking card hole, and constitutes a snap fit between the locking block buckle plate and the first convex strip and the second convex strip.

[0005] The beneficial effect of the above structure is that the locking buckle plate can lock the first convex strip of the bottom shell with the second convex strip of the upper shell, thereby ensuring that the connection between the bottom shell and the upper shell is more compact and firm, so that the connection at the shell wiring screw hole is more firm, and the corresponding wiring terminals of the bottom shell and the upper shell are not easy to be spread apart, which is conducive to improving the working reliability of the small circuit breaker shell. The locking buckle plate is clamped on the first convex strip and the second convex strip, so that it is easy to assemble the locking buckle plate with the bottom shell and the upper shell, and the assembly efficiency is higher. Therefore, the small circuit breaker shell has the advantages of simple structure, stable and reliable performance, and convenient assembly.

[0006] In particular, the locking plate is symmetrically provided with two hooks, the bottom shell and the upper shell are respectively provided with through holes for the hooks to pass through, the inner walls of the bottom shell and the upper shell are respectively provided with engaging grooves that match the hooks, the hooks pass through the through holes and engage in the engaging grooves, and form an engaging fit between the two hooks and the bottom shell and the upper shell. The locking plate is engaged in the engaging grooves in the bottom shell and the upper shell through the two hooks, thereby ensuring that the connection between the locking plate and the bottom shell and the upper shell is more compact and firm, and the bottom shell and the upper shell are not easily stretched apart, which is conducive to improving the working reliability of the housing of the small circuit breaker.

[0007] In particular, the bottom shell and the upper shell are provided with a decorative cover, two supporting arms are provided at both ends of one side of the decorative cover, the bottom shell and the upper shell are respectively provided with a receiving groove matched with the two supporting arms, the receiving grooves are respectively provided with a positioning shaft matched with the supporting arms, the two supporting arms are respectively provided with a positioning hole matched with the positioning shaft, the positioning shaft is inserted into the positioning hole, and constitutes a rotational connection and cooperation between the decorative cover and the positioning shaft of the bottom shell and the upper shell. The decorative cover is connected to the positioning shaft of the bottom shell and the upper shell through the two supporting arms, so that the assembly of the decorative cover with the bottom shell and the upper shell is convenient, and the assembly efficiency is higher.

[0008] In particular, the decorative cover is provided with a limiting groove, the bottom shell and the upper shell are provided with limiting blocks matched with the limiting groove, the limiting groove is buckled on the limiting blocks, and constitutes a snap fit between the decorative cover and the bottom shell and the upper shell. The limiting groove of the decorative cover is snapped on the limiting blocks of the bottom shell and the upper shell, thereby ensuring a more compact connection between the decorative cover and the bottom shell and the upper shell.

[0009] In particular, one end of the two support arms is provided with an arc-surface protrusion matched with the receiving groove, and the receiving groove is provided with an arc-surface groove matched with the arc-surface protrusion, and the arc-surface protrusion moves with the support arms and slides back and forth on the arc-surface groove. The arc-surface protrusions of the two support arms are slidably arranged on the arc-surface groove of the receiving groove, so that the two support arms will not be stuck or stuck with the receiving grooves of the bottom shell and the upper shell, ensuring that the decorative cover can be reliably rotated on the bottom shell and the upper shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a stereogram of an embodiment of the utility model.

[0011] Figure 2 This is an exploded view of an embodiment of the utility model.

[0012] Figure 3 It is a cross-sectional view of an embodiment of the utility model.

[0013] Figure 4 It is a three-dimensional diagram of a decorative cover according to an embodiment of the utility model. DETAILED DESCRIPTION

[0014] like Figures 1 to 4 As shown, the embodiment of the utility model is a small circuit breaker housing, including a bottom shell 10 and an upper shell 11 arranged on the bottom shell 10, a semi-circular first convex strip 101 is arranged on the bottom shell 10 corresponding to the wiring screw hole 100, a second convex strip 111 is arranged on the upper shell 11 to match the first convex strip 101, the first convex strip 101 and the second convex strip 111 surround a circular convex portion 1000, the bottom shell 10 and the upper shell 11 are provided with a locking buckle plate 12 for locking the first convex strip 101 and the second convex strip 111, the locking buckle plate 12 is provided with a locking card hole 121 matching the convex portion 1000, the convex portion 1000 is engaged in the locking card hole 121, and constitutes a snap fit between the locking block buckle plate 12 and the first convex strip 101 and the second convex strip 111.

[0015] like Figure 2 and 3 As shown, the locking buckle plate 12 is symmetrically provided with two hooks 122, the bottom shell 10 and the upper shell 11 are respectively provided with through holes 1001 for the hooks 122 to pass through, and the inner walls of the bottom shell 10 and the upper shell 11 are respectively provided with snap-in grooves 1002 that match the hooks 122, and the hooks 122 pass through the through holes 1001 and snap into the snap-in grooves 1002, and form snap-in cooperation between the two hooks 122 and the bottom shell 10 and the upper shell 11. The locking buckle plate is snap-fitted into the snap-in grooves in the bottom shell and the upper shell through the two hooks, so that the connection between the locking buckle plate and the bottom shell and the upper shell can be more compact and firm, and the bottom shell and the upper shell are not easily stretched apart, which is conducive to improving the working reliability of the housing of the small circuit breaker.

[0016] like Figure 2 and 4As shown, the bottom shell 10 and the upper shell 11 are provided with a decorative cover 13, and two supporting arms 131 are provided at both ends of one side of the decorative cover 13. The bottom shell 10 and the upper shell 11 are respectively provided with a receiving groove 1003 matched with the two supporting arms 131, and the receiving groove 1003 is respectively provided with a positioning shaft 1004 matched with the supporting arm 131, and the two supporting arms 131 are respectively provided with a positioning hole 132 matched with the positioning shaft 1004, and the positioning shaft 1001 is inserted into the positioning hole 132, and constitutes the rotational connection and cooperation between the decorative cover 13 and the positioning shaft 1004 of the bottom shell 10 and the upper shell 11. The decorative cover is connected to the positioning shafts of the bottom shell and the upper shell through the two supporting arms, so that the assembly of the decorative cover with the bottom shell and the upper shell is convenient, and the assembly efficiency is higher. The decorative cover 13 is provided with a limiting groove 133, and the bottom shell 10 and the upper shell 11 are provided with limiting blocks 1005 that match the limiting groove 133. The limiting groove 133 is buckled on the limiting blocks 1005, and constitutes the snap-fitting of the decorative cover 13 with the bottom shell 10 and the upper shell 11. The limiting groove of the decorative cover is snapped on the limiting blocks of the bottom shell and the upper shell, so as to ensure that the connection between the decorative cover and the bottom shell and the upper shell is more compact. The two support arms 131 are provided with an arc-surface protrusion 1311 that matches the receiving groove 1003 on one end, and the receiving groove 1003 is provided with an arc-surface groove 10031 that matches the arc-surface protrusion 1311. The arc-surface protrusion 1311 moves with the support arm 131 and slides back and forth on the arc-surface groove 10031. The arcuate protrusions of the two support arms are slidably arranged on the arcuate grooves of the receiving grooves, so that the two support arms will not be stuck or jammed with the receiving grooves of the bottom shell and the upper shell, ensuring that the decorative cover can be reliably rotated on the bottom shell and the upper shell.

[0017] The locking buckle plate can lock the first convex strip of the bottom shell with the second convex strip of the upper shell, thereby ensuring that the connection between the bottom shell and the upper shell is more compact and firm, so that the connection at the shell wiring screw hole is more firm, and the corresponding wiring terminals of the bottom shell and the upper shell are not easy to be stretched apart, which is conducive to improving the working reliability of the small circuit breaker shell. The locking buckle plate is clamped on the first convex strip and the second convex strip, so as to facilitate the assembly of the locking buckle plate with the bottom shell and the upper shell, and the assembly efficiency is higher. Therefore, the small circuit breaker shell has the advantages of simple structure, stable and reliable performance, and convenient assembly.

Claims

1. A miniature circuit breaker housing, comprising a bottom housing and an upper housing disposed on the bottom housing, characterized in that: A semicircular first convex strip is arranged on the bottom shell at a position corresponding to the wiring screw hole, a second convex strip matching with the first convex strip is arranged on the upper shell, the first convex strip and the second convex strip enclose a circular convex portion, a locking buckle plate for locking the first convex strip and the second convex strip is arranged on the bottom shell and the upper shell, a locking card hole matching with the convex portion is arranged on the locking buckle plate, the convex portion is engaged in the locking card hole, and constitutes a snap fit between the locking block buckle plate and the first convex strip and the second convex strip.

2. The miniature circuit breaker housing according to claim 1, characterized in that: Two hooks are symmetrically arranged on the locking buckle plate, and through holes for the hooks to pass through are respectively arranged on the bottom shell and the upper shell, and connecting grooves matching with the hooks are respectively arranged on the inner walls of the bottom shell and the upper shell. The hooks pass through the through holes and engage in the connecting grooves, and form a connecting fit between the two hooks and the bottom shell and the upper shell.

3. The miniature circuit breaker housing according to claim 1 or 2, characterized in that: The bottom shell and the upper shell are provided with decorative covers, and two supporting arms are provided on both ends of one side of the decorative cover. The bottom shell and the upper shell are respectively provided with receiving grooves matching with the two supporting arms, and the receiving grooves are respectively provided with positioning shafts matching with the supporting arms. The two supporting arms are respectively provided with positioning holes matching with the positioning shafts, and the positioning shafts are inserted into the positioning holes to form a rotational connection between the decorative cover and the positioning shafts of the bottom shell and the upper shell.

4. The miniature circuit breaker housing according to claim 3, characterized in that: The decorative cover is provided with a limiting groove, and the bottom shell and the upper shell are provided with limiting blocks matched with the limiting groove. The limiting groove is buckled on the limiting block, and constitutes a snap fit between the decorative cover and the bottom shell and the upper shell.

5. The miniature circuit breaker housing according to claim 3, characterized in that: An arcuate protrusion matched with the receiving groove is arranged on one end of the two support arms, and an arcuate groove matched with the arcuate protrusion is arranged in the receiving groove. The arcuate protrusion moves with the support arms and slides back and forth on the arcuate groove.

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