A quick automatic closing mechanism of a molded case circuit breaker and a molded case circuit breaker provided with the mechanism

Abstract

The application relates to the field of power electronics, and discloses a quick automatic closing mechanism of a molded case circuit breaker and a molded case circuit breaker provided with the mechanism, which comprises a DC motor fixed on the circuit breaker, a fixed plate arranged above the DC motor, and an output end connected with a speed reducer; a gear fixed on the output end of the speed reducer; a single rack rotatably connected to a lever support of a main mechanism of the circuit breaker at one end in the radial direction of the gear, and the single rack is engaged with the gear; and a hand-operated mechanism fixed on the single rack, which can separate the single rack from the gear by moving the single rack to one side. Compared with the prior art, the engagement rotation of the rotatably connected single rack and the gear is used to realize the self-clutching of the circuit breaker, the quick closing of the reclosing-closing operation can be reliably realized, the electric operation and the manual operation can be combined, the DC motor does not need to be stopped during the manual operation, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a molded case circuit breaker fast automatic closing mechanism and a molded case circuit breaker equipped with the mechanism. Background Art

[0002] The opening and closing actions of traditional molded case circuit breakers require manual operation. However, due to the development of smart grids, a variety of assembled molded case circuit breakers have appeared on the market, and most of the assembled molded case circuit breakers are linked with handles.

[0003] For example, Chinese patent CN207149496U discloses an energy storage electric operating device for a molded case circuit breaker, in which a transmission mechanism is installed above the molded case circuit breaker, covering the entire handle of the molded case circuit breaker, thereby using the transmission mechanism to drive the handle operation to achieve automatic switching. However, this installation method increases the height of the entire molded case circuit breaker and does not have the possibility of manual operation. When manual operation is required, special tools are required to disassemble the transmission mechanism or manual operation cannot be achieved at all, that is, the reclosing mechanism must be connected to the handle, and the reclosing mechanism needs to cover the handle, so that the circuit breaker cannot be directly controlled by the handle, affecting the convenience of manually controlling the circuit breaker.

[0004] For the purpose of manual-automatic switching, Chinese patent CN201811631779.1 discloses an intelligent molded case circuit breaker, which exposes the handle to the outside and realizes manual-automatic switching by manually rotating the piece.

[0005] Traditional circuit breakers use AC motors for reclosing and reclosing. However, the motor's low speed prevents rapid closing and prevents self-clutching of the circuit breaker. Patent document CN110047713A discloses a reclosing transmission mechanism and molded case circuit breaker. These mechanisms are complex in structure and installation, requiring the motor's forward and reverse rotation to achieve reclosing and reclosing.

[0006] Chinese patent CN111105963A discloses a rapid closing mechanism that utilizes an internal double-toothed rack and an incomplete gear to achieve self-clutching of the circuit breaker, reliably performing a re-clutch-and-close operation. The mechanism can be operated both electrically and manually, using a DC motor to increase the speed for rapid circuit breaker closing. However, the internal double-toothed rack is immovable, requiring an external tool to rotate the incomplete gear to achieve self-clutching during manual re-clutch-and-close operation. Furthermore, manual self-clutching requires the DC motor to be shut down, which is very inconvenient. Summary of the Invention

[0007] The application aims at providing a plastic shell circuit breaker quick automatic closing mechanism and a plastic shell circuit breaker provided with the mechanism.

[0008] Technical scheme: The application provides a plastic shell circuit breaker quick automatic closing mechanism based on the use of a plastic shell circuit breaker, and the mechanism comprises:

[0009] A direct current motor is fixed on the circuit breaker, a fixed plate is arranged above the motor, and an output end of the motor is connected with a speed reducer;

[0010] A gear is fixed on an output end of the speed reducer;

[0011] A single rack is rotatably connected to a lever support of a main mechanism of the circuit breaker at one end along a radial direction of the gear, and a rack opening of the single rack is engaged with the gear;

[0012] A hand pushing mechanism is fixed on the single rack, and the single rack can be separated from the gear by pushing the single rack to one side.

[0013] Further, the hand pushing mechanism comprises a rocker arm, one end of the rocker arm is rotatably connected to the fixed plate, and convex cylinders are fixed on both upper and lower sides of the other end of the rocker arm, and the lower convex cylinder is slidably connected in a first groove arranged along a length direction of the single rack.

[0014] Further, the hand pushing mechanism further comprises a hand pushing plate, a second groove is arranged on a lower surface of the hand pushing plate, the upper convex cylinder of the rocker arm is slidably connected in the second groove, and a handle is arranged on an upper surface of the hand pushing plate.

[0015] Further, the second groove is arranged in an inclined manner on the lower surface of the hand pushing plate.

[0016] Further, the hand pushing plate is in a square structure, and the second groove is arranged along diagonal edges of the hand pushing plate.

[0017] Further, a limiting column is further arranged on the fixed plate, and the limiting column is arranged on a side away from the rack opening of the single rack.

[0018] The application further discloses a plastic shell circuit breaker, and the circuit breaker is provided with the plastic shell circuit breaker quick automatic closing mechanism.

[0019] Advantages:

[0020] 1. The present invention realizes self-clutching of the circuit breaker by providing a single rack connected in rotation and meshing with the gear, reliably realizing rapid closing of the re-clamp-close operation, and can be operated both electrically and manually. During manual operation, there is no need to stop the DC motor, thereby improving closing efficiency.

[0021] 2. The power source of the fast closing mechanism of the present invention uses a DC motor, which has a higher speed of up to 25r / min. Compared with the speed of 2.5r / min of the AC motor, its speed is greatly improved, which can achieve fast closing.

[0022] 3. The hand-operated mechanism of the present invention utilizes a rocker arm to slide in the groove of a single rack, and can move the single rack in an undulating manner through a raised cylinder until it is not engaged with the gear, thereby realizing self-clutching of the circuit breaker without turning off the DC motor.

[0023] 4. The present invention provides a push plate above the rocker arm, which can cover the single rack and can be directly pushed by the handle without the need for other auxiliary tools, making it easy to manually open and close the switch.

[0024] 5. The present invention provides an inclined groove on the lower surface of the hand push plate, which can ensure that the hand push plate moves horizontally when it is moved. However, the horizontal movement can realize the rotation of a single rack with one end as the origin. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the connection between the rapid automatic closing mechanism of the molded case circuit breaker and the circuit breaker of the present invention;

[0026] Figure 2 This is a structural diagram of the rapid automatic closing mechanism of the molded case circuit breaker of the present invention;

[0027] Figure 3 This is a structural schematic diagram of the hand push plate of the rapid automatic closing mechanism of the molded case circuit breaker of the present invention.

[0028] Among them, 1-DC motor, 2-gear, 3-single rack, 4-fixed plate, 5-reduction gearbox, 6-circuit breaker main mechanism lever bracket, 7-rocker arm, 8-support column, 9-raised cylinder, 10-first groove, 11-hand push plate, 12-second groove, 13-handle, 14-limiting column. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The present invention relates to the technical field of circuit breakers, and is a mechanism for fast closing on a circuit breaker. It is based on the use of a molded case circuit breaker and discloses a fast automatic closing mechanism for a molded case circuit breaker, which mainly includes a DC motor 1, a gear 2, a single rack 3, and a hand-shift mechanism, which is a power source for electric closing. The DC motor 1 is fixed on the circuit breaker, and a fixed plate 4 is fixed on the upper surface of the DC motor 1. The fixed plate 4 is fastened by screws, and the output end of the DC motor 1 is connected to the reduction box 5. The gear 2 is fixed at the output end of the reduction box 5, and the DC motor 1 rotates to drive the gear 2 to rotate. A tooth opening is provided on one side of the single rack 3, and one end thereof is connected to the lever bracket 6 of the main mechanism of the circuit breaker by rotation along the radial direction of the gear 2. The tooth opening of the single rack 3 is engaged with the gear 2, and the other end of the single rack 3 is located on the upper surface of the fixed plate 4. The hand-shift mechanism is fixed on the single rack 3, and the single rack 3 can be separated from the gear 2 by shifting the single rack 3 to one side.

[0033] In this embodiment, the hand-shift mechanism includes a rocker arm 7, one end of which is rotatably connected to the fixed plate 4 through a support column 8, and a raised cylinder 9 is fixed to the upper and lower side surfaces of the other end. The lower raised cylinder 9 is slidably connected to the first groove 10 set along the length direction of the single rack 3. By shifting the upper raised cylinder 9, the single rack 3 can be shifted to one side, so that the gear 2 and the single rack 3 are not engaged, thereby realizing self-clutching.

[0034] When the molded case circuit breaker is in the open state, the teeth of the single rack 3 do not mesh with gear 2, and the DC motor 1 remains in the running state. To manually close the circuit breaker, manually toggle the rocker 7 to rotate the single rack 3 toward gear 2 until they mesh, completing the re-engagement process. The DC motor 1 continues to rotate, and the single rack 3 meshes with gear 2 until the closing process is complete.

[0035] In order to facilitate manual operation by the operator, the trajectory of the movement is arc-shaped when the raised cylinder 9 is used to move the handle. In this embodiment, a hand push plate 11 is further provided on the rocker arm 7. The lower surface of the hand push plate 11 is provided with a second groove 12. The raised cylinder 9 on the upper side of the rocker arm 7 is slidably connected to the second groove 12. A handle 13 is provided on the upper surface of the hand push plate 11. The second groove 12 is provided in an inclined shape on the lower surface of the hand push plate 11. In this embodiment, the hand push plate 11 is a square structure, and the second groove 12 is provided along the diagonal edge of the hand push plate 11. In this way, when using the handle 13 to move the handle, only the handle 13 needs to be extended. Figure 1 Move the handle 13 horizontally in the middle A direction, and the rocker arm 7 rotates a certain angle counterclockwise. At this time, the raised cylinder 9 on the lower surface of the rocker arm 7 slides in the first groove 10, and the raised cylinder 9 on the upper surface of the rocker arm 7 slides in the second groove 12 on the lower surface of the hand push plate 11, realizing an arc rotation of the rocker arm 7 and pulling the single rack 3 away from the gear 2.

[0036] A limiting column 14 is further provided on the fixing plate 4 , and the limiting column 14 is arranged facing away from the tooth opening of the single rack 3 . The single rack 3 is arranged between the limiting column 14 and the gear 2 .

[0037] The present invention also discloses a molded case circuit breaker, which is provided with the above-mentioned molded case circuit breaker fast automatic closing mechanism, see the attached Figure 1 .

[0038] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A molded case circuit breaker fast automatic closing mechanism, based on the molded case circuit breaker, characterized in that: include: A DC motor (1) is fixed on the circuit breaker, a fixing plate (4) is provided above the DC motor, and an output end is connected to a reduction gearbox (5); A gear (2) is fixed to the output end of the reduction box (5); A single rack (3), one end of which is rotatably connected to a lever bracket (6) of a main mechanism of a circuit breaker along a radial direction of the gear (2), and a tooth opening of the single rack (3) is engaged with the gear (2); A hand-shift mechanism, wherein the hand-shift mechanism is fixed to the single rack (3), and the single rack (3) can be separated from the gear (2) by shifting the single rack (3) to one side; The hand-shift mechanism comprises a rocker arm (7), one end of which is rotatably connected to the fixed plate (4), and the other end of which is fixed with raised cylinders (9) on both the upper and lower side surfaces, and the lower raised cylinder (9) is slidably connected to a first groove (10) provided along the length direction of the single rack (3); The hand-operated mechanism further comprises a hand-push plate (11), a second groove (12) is provided on the lower surface of the hand-push plate (11), a raised cylinder (9) on the upper side of the rocker arm (7) is slidably connected in the second groove (12), and a handle (13) is provided on the upper surface of the hand-push plate (11); The second groove (12) is arranged in an inclined shape on the lower surface of the hand push plate (11).

2. The molded case circuit breaker fast automatic closing mechanism according to claim 1, characterized in that: The hand push plate (11) is a square structure, and the second groove (12) is arranged along the diagonal edge of the hand push plate (11).

3. The molded case circuit breaker fast automatic closing mechanism according to claim 1, characterized in that: A limiting column (14) is also provided on the fixed plate (4), and the limiting column (14) is arranged facing away from the tooth opening of the single rack (3).

4. A molded case circuit breaker, characterized in that: The circuit breaker is provided with a molded case circuit breaker fast automatic closing mechanism according to any one of claims 1 to 3.

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