An operating mechanism for low-voltage molded case circuit breaker in power distribution cabinet

Abstract

The invention discloses an operating mechanism of a new type of low-voltage molded case circuit breaker for a power distribution cabinet, comprising a fixed bracket, mounting plates are arranged on both sides of the fixed bracket; a shell, the shell is fixedly arranged on the fixed bracket, a cavity is arranged in the shell, and an operating mechanism is arranged in the cavity. The invention has a simple structure, is easy to process, and has low cost, greatly improves the standardization of production scale, eliminates the confusion of user selection, and is convenient for maintenance and exchange.

Description

Technical Field

[0001] The invention relates to the technical field of power supply and distribution equipment accessories, and in particular to an operating mechanism of a novel low-voltage molded case circuit breaker of a power distribution cabinet. Background Art

[0002] Low-voltage circuit breakers can be seen everywhere in electrical product exhibitions and electrical appliance markets, especially molded case circuit breakers are very popular. Molded case circuit breakers have two-stage protection functions of long delay for overload and instantaneous short circuit, and can also be used in conjunction with leakage circuit breakers, measurement, electric operation and other module units. In low-voltage power distribution systems, it is often used as a terminal switch or branch switch, replacing the fuses and knife switches commonly used in the past.

[0003] Chinese patent 201410317219.4 discloses a drawer operation interlock mechanism for a low-voltage power distribution cabinet. The mechanism includes a fixed frame fixedly mounted above the bottom plate of the drawer, on which a circuit breaker operating mechanism for opening or closing the circuit breaker switch is mounted, a drawer interlock mechanism for unlocking the drawer when the circuit breaker switch is opened or locking the drawer when the circuit breaker switch is closed, and a drive shaft fixedly connected between the circuit breaker operating mechanism and the drawer interlock mechanism for simultaneously driving the circuit breaker operating mechanism and the drawer interlock mechanism to operate, the drive shaft is passed through the fixed frame, the head end is exposed outside the fixed frame, the tail end is fixedly connected to the circuit breaker operating mechanism, and the drawer interlock mechanism is fixedly connected between the head end and the tail end of the drive shaft.

[0004] However, the above patent still has problems. For example, each molded case circuit breaker model of the traditional distribution cabinet distribution unit (each drawer circuit) must be equipped with a special matching operating mechanism. In this way, due to the differences in external dimensions and switch strokes of thousands of models of molded case circuit breakers, thousands of operating mechanism models are required to match them. This makes it impossible for manufacturers of the product to form large-scale mass production, causes confusion in management and a large backlog of product inventory, and causes manufacturers to make selection errors due to the large number of models, and the non-interchangeability results in a large waste of accessories and increased costs, etc. Summary of the invention

[0005] In view of the above problems, the present invention provides an operating mechanism with a simple structure and easy use, and has an installation structure that subverts the traditional installation method on the circuit breaker, solving the limitation that each manufacturer has to equip each molded case circuit breaker model with a dedicated operating mechanism.

[0006] The technical solution adopted by the present invention to solve the above problems is:

[0007] An operating mechanism of a novel low-voltage molded case circuit breaker of a power distribution cabinet comprises a fixed bracket with mounting plates on both sides of the fixed bracket; a shell fixedly arranged on the fixed bracket, a cavity provided in the shell, and an operating mechanism provided in the cavity.

[0008] Furthermore, the operating mechanism includes a slide rod fixed in the cavity, a slider is sleeved on the slide rod, return springs are provided at both ends of the slide rod, a positioning block is provided at the front end of the slider, and a rotating arm device is provided on the positioning block.

[0009] The design of the slider can better adapt to the size of the switch. The reset spring allows the switch to rebound adaptively after being bent to the limit, so that the square shaft can be adjusted back to the correct position, making the switch operation more user-friendly.

[0010] Furthermore, the rotating arm device includes a shaft sleeve arranged on the outer shell, a rotating arm is arranged at the rear end of the shaft sleeve, a sliding groove is arranged in the rotating arm, and the positioning block is movably arranged in the sliding groove.

[0011] Furthermore, a shaft hole is provided at the front end of the shaft sleeve, a tooth-shaped square hole is provided in the shaft hole, and a square shaft is provided on the tooth-shaped square hole.

[0012] The tooth-shaped square hole design allows the operating mechanism to be suitable for more switches, while at the same time correcting the direction of the square axis and not being restricted by the original square hole to cause the switch angle to be skewed.

[0013] Furthermore, a limiting fixing plate is provided on the square shaft, the limiting fixing plate is L-shaped, one end of the limiting fixing plate is fixedly arranged on a fixing bracket, and the square shaft passes through the limiting fixing plate.

[0014] By means of the limiting fixing plate, the square shaft is fixed on the operating mechanism through the shaft sleeve and the limiting fixing plate, so that the usable length of the square shaft can be greatly increased.

[0015] Furthermore, a cover plate is provided on the rear side of the shell, and a hollow portion is provided on the cover plate.

[0016] The advantages of the present invention are:

[0017] 1. The present invention has a simple structure, is easy to process and has low cost;

[0018] 2. Due to the technical requirements for the operating mechanism (horizontal and vertical directions when the switch is open and closed), the travel of the circuit breakers produced by each manufacturer is slightly different. By improving the design of the shaft hole, the original square shape is changed to a multi-tooth shape, which solves the problem that the connection between the connecting rod and the handle is not at a 90-degree position due to the different travels of each switch;

[0019] 3. In order to meet the current specifications of low-voltage molded case circuit breakers, the operating mechanism is divided into three models, A (630A-800A), B (250A-400A) and C (63A-125A), and thousands of models are changed to three universal models. This greatly improves the standardization of production scale, eliminates the confusion of user selection, and facilitates maintenance and interchange;

[0020] 4. The present invention is easy to manufacture, convenient to assemble, stable in structure and durable.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute a part of this specification and are used to further understand the present invention, illustrate preferred embodiments of the present invention and are used together with the specification to explain the principles of the present invention. In the drawings:

[0023] Figure 1 It is a front view of the present invention;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 3 It is another three-dimensional structural schematic diagram of the present invention;

[0026] Figure 4 It is a partial structural schematic diagram of the present invention.

[0027] The following are marked in the figure:

[0028] 1 is a fixed bracket, 2 is a mounting plate, 3 is a housing, 4 is an operating mechanism, 5 is a slide bar, 6 is a slider, 7 is a return spring, 8 is a positioning block, 9 is a rotating arm device, 10 is a shaft sleeve, 11 is a rotating arm, 12 is a slide groove, 13 is an axis hole, 14 is a toothed square hole, 15 is a square shaft, 16 is a fixed limit plate, 17 is a cover plate, and 18 is a hollow part. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0030] refer to Figures 1 to 4 ,like Figure 1 The operating mechanism of a new type of low-voltage molded case circuit breaker in a distribution cabinet shown in the figure comprises a fixed bracket 1, with mounting plates 2 provided on both sides of the fixed bracket 1; a shell 3, which is fixedly arranged on the fixed bracket 1, with a cavity provided in the shell 3, and an operating mechanism 4 provided in the cavity.

[0031] The operating mechanism 4 includes a slide rod 5 fixed in the cavity, a slider 6 is sleeved on the slide rod 5, return springs 7 are provided at both ends of the slide rod 5, a positioning block 8 is provided at the front end of the slider 6, and a rotating arm device 9 is provided on the positioning block 8.

[0032] The rotating arm device 9 includes a shaft sleeve 10 arranged on the housing 1 , a rotating arm 11 is arranged at the rear end of the shaft sleeve 10 , a sliding groove 12 is arranged in the rotating arm 11 , and the positioning block 8 is movably arranged in the sliding groove 12 .

[0033] The front end of the shaft sleeve 10 is provided with an axial hole 13 , a tooth-shaped square hole 14 is provided in the axial hole 13 , and a square shaft 15 is provided on the tooth-shaped square hole 14 .

[0034] The square shaft 15 is also provided with a limiting fixing plate 16 . The limiting fixing plate 16 is L-shaped. One end of the limiting fixing plate 16 is fixedly disposed on the fixing bracket 1 . The square shaft 15 passes through the limiting fixing plate 16 .

[0035] A cover plate 17 is further disposed at the rear side of the housing 3 , and a hollow portion 18 is disposed on the cover plate 17 .

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An operating mechanism for a low-voltage molded case circuit breaker in a power distribution cabinet, characterized in that: The invention comprises a fixed bracket (1), and mounting plates (2) are arranged on both sides of the fixed bracket (1); a shell (3), and the shell (3) is fixedly arranged on the fixed bracket (1); a cavity is arranged in the shell (3), and an operating mechanism (4) is arranged in the cavity; the operating mechanism (4) comprises a slide bar (5) fixed in the cavity, a slider (6) is sleeved on the slide bar (5), and return springs (7) are arranged at both ends of the slide bar (5); a positioning block (8) is arranged at the front end of the slider (6), and a rotating arm device (9) is arranged on the positioning block (8). The rotating arm device (9) comprises a shaft sleeve (10) arranged on the outer shell (3); a rotating arm (11) is arranged at the rear end of the shaft sleeve (10); a sliding groove (12) is arranged in the rotating arm (11); the positioning block (8) is movably arranged in the sliding groove (12); an axial hole (13) is arranged at the front end of the shaft sleeve (10); a tooth-shaped square hole (14) is arranged in the axial hole (13); a square shaft (15) is arranged on the tooth-shaped square hole (14); a cover plate (17) is further arranged on the rear side of the outer shell (3); and a hollow portion (18) is arranged on the cover plate (17); The square shaft (15) is also provided with a limiting fixing plate (16), the limiting fixing plate (16) is L-shaped, one end of the limiting fixing plate (16) is fixedly arranged on the fixing bracket (1), and the square shaft (15) passes through the limiting fixing plate (16).

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