CN111968892A - Current limiting device of quick circuit breaker - Google Patents

Abstract

The invention discloses a current limiting device of a quick circuit breaker, which comprises a shell, and a static contact rod and a movable contact rod which are arranged in the shell, wherein an elastic pressing mechanism on the shell presses one side of the movable contact rod, and the elastic pressing mechanism consists of a rectangular limiting sleeve fixedly arranged on the inner wall of the shell, a rectangular movable plate arranged in the rectangular limiting sleeve in a sliding manner, a screw rod penetrating through the middle part of the rectangular movable plate and in threaded connection with the rectangular movable plate, and a compression spring arranged under the rectangular limiting sleeve and fixedly connected with the static contact rod; the middle part of rectangle fly leaf is provided with pressure sensor, pressure sensor and the singlechip electric connection on the shell lateral wall, the singlechip turns into digital signal transmission from the signal of telecommunication that pressure sensor received and shows for the electronic screen that the shell outside set up. The device can carry out accurate quick regulation to the pressure holding power of elasticity pressure holding mechanism, bears the electronic repulsion that different heavy currents produced to conveniently use the circuit breaker in different usage.

Description

Current limiting device of quick circuit breaker

Technical Field

The invention belongs to the technical field of electrical equipment, and particularly relates to a current limiting device of a quick circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time. The circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to the application range, the high-voltage and low-voltage boundary lines are relatively vague, and the circuit breakers above 3kV are generally called high-voltage electric appliances. The circuit breaker can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power supply circuit, the motor and the like, and automatically cutting off a circuit when faults such as serious overload, short circuit, undervoltage and the like occur, and the function of the circuit breaker is equivalent to the combination of a fuse type switch, an over-under-heat relay and the like. Furthermore, no parts need to be changed after breaking the fault current. At present, it has been widely used.

The circuit breaker adopts a group of contacts to perform switching-on and switching-off current, and when large short-circuit current occurs, the contacts are difficult to switch off electric arcs, so that high switching-off is difficult to realize. In particular, in the case of a circuit breaker having a rated current of 16A or less, when a large short-circuit current is applied, a problem of breaking the circuit breaker is likely to occur in which a coil or a heating element is blown. A current limiting device needs to be provided.

When the circuit breaker is normally used, the elastic pressing structure is pressed, the contacts on the opposite surfaces of the static contact rod and the movable contact rod are mutually abutted and pressed to form a channel with an external circuit, after a large current passes between the static contact rod and the movable contact rod, electric repulsion is generated to push the static contact rod and the movable contact rod to be away from each other, when a certain distance is kept away, short-circuit current is rapidly disconnected, so that a main circuit is protected, when the circuit breaker is applied to different electric equipment, the passing large current is different, the electric repulsion required to be resisted by the elastic pressing structure is also different, the circuit breaker is designed and manufactured just for the different electric equipment, the cost is increased, manpower and material resources are consumed, the applicability is also insufficient, and the improved design is required.

Disclosure of Invention

The present invention is directed to a current limiting device for a fast circuit breaker, which is used to solve the above problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a current limiting device of a quick circuit breaker comprises a shell, a static contact rod and a movable contact rod, wherein the static contact rod and the movable contact rod are arranged in the shell, an elastic pressing and holding mechanism on the shell is pressed and held on one side of the movable contact rod, so that contacts on opposite surfaces of the movable contact rod and the static contact rod are pressed and held together, and the elastic pressing and holding mechanism comprises a rectangular limiting sleeve fixedly arranged on the inner wall of the shell, a rectangular movable plate arranged in the rectangular limiting sleeve in a sliding mode, a screw rod penetrating through the middle of the rectangular movable plate and in threaded connection with the rectangular movable plate, and a compression spring arranged under the rectangular limiting sleeve and fixedly connected with the static;

the middle part of rectangle fly leaf is provided with pressure sensor, pressure sensor and the singlechip electric connection on the shell lateral wall, the singlechip turns into digital signal transmission from the signal of telecommunication that pressure sensor received and shows for the electronic screen that the shell outside set up.

Preferably, a movable nut is fixedly arranged in the middle of the rectangular movable plate and sleeved on the outer side of the screw rod and is in threaded connection with the screw rod.

Preferably, the side of the shell is rotatably provided with a knob, and the end part of the screw penetrates through the shell and is fixedly connected with the middle part of the knob.

Preferably, the thread bush and the shell are of an integrally formed structure, and the shell, the rectangular limiting sleeve, the rectangular movable plate and the screw rod are made of insulating rubber materials.

Preferably, a buzzer is arranged on the shell and electrically connected with the single chip microcomputer.

The invention has the technical effects and advantages that: this quick circuit breaker's current limiting device presses the pressure of holding the mechanism to compression spring through rotatory screw rod adjustment elasticity to the pressure gram number between adjustment movable contact pole and the stationary contact pole, the resistance to electronic repulsion between adjustment movable contact pole and the stationary contact pole, thereby it is different to the application degree of different numerical value heavy currents, thereby guarantee that the circuit breaker is applicable to various consumer, the practicality is stronger, has saved the step to different consumer customization circuit breakers, saves cost and manpower.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of the elastic pressing mechanism.

In the figure: 1. a housing; 2. a stationary contact bar; 3. a movable contact rod; 4. an elastic pressing mechanism; 41. a rectangular limiting sleeve; 42. a rectangular movable plate; 43. a screw; 44. a compression spring;

5. a pressure sensor; 6. a single chip microcomputer; 7. an electronic screen; 8. a buzzer; 9. a knob; 10. a movable nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a current limiting device of a quick circuit breaker as shown in fig. 1-2, which comprises a shell 1, and a static contact rod 2 and a movable contact rod 3 which are arranged in the shell 1, wherein an elastic pressing mechanism 4 on the shell 1 is pressed and held on one side of the movable contact rod 3, so that contacts on opposite surfaces of the movable contact rod 3 and the static contact rod 2 are pressed and held together, and the elastic pressing mechanism 4 comprises a rectangular limiting sleeve 41 fixedly arranged on the inner wall of the shell 1, a rectangular movable plate 42 arranged in the rectangular limiting sleeve 41 in a sliding manner, a screw 43 penetrating through the middle part of the rectangular movable plate 42 and in threaded connection with the rectangular movable plate 42, and a compression spring 44 arranged under the rectangular limiting sleeve 41 and fixedly connected with the static contact rod 2;

the middle part of rectangle fly leaf 42 is provided with pressure sensor 5, pressure sensor 5 and the singlechip 6 electric connection on the shell 1 lateral wall, singlechip 6 turns into digital signal transmission from the signal of telecommunication that pressure sensor 5 received and shows for the electronic screen 7 that the shell 1 outside set up.

A current limiting device adjusting step, rotating the screw 43 clockwise, due to the screw 43 being in threaded connection with the middle of the rectangular movable plate 42, the rectangular movable plate 42 vertically descends along the screw 43 to press the compression spring 44 on the movable contact rod 3 through the interaction force between the threads, so that the compression spring 44 is shortened to generate a restoring force, and then the compression amount of the compression spring 44 is increased along with the descending of the rectangular movable plate 42, so as to generate a larger restoring force, so that the holding force of one end of the compression spring 44 on the movable contact rod 3 is increased, and simultaneously the restoring forces of the two ends of the compression spring 44 are the same, namely the pressure of the compression spring 44 on the movable contact rod 3 is the same as the pressure of the compression spring 44 on the pressure sensor 5 at the lower side of the rectangular movable plate 42, the pressure sensor 5 converts the pressure signal into a digital signal and transmits the, show specific body pressure gram number on electronic screen 7, through adjustment compression spring 44 pressure gram number, adjust the resistance to electronic repulsion between movable contact rod 3 and the quiet contact rod 2 to the application degree to different numerical value heavy currents is different, thereby guarantees that the circuit breaker is applicable to various consumer, and the practicality is stronger, has saved the step to different consumer customization circuit breakers, saves cost and manpower.

The middle part of the rectangular movable plate 42 is fixedly provided with a movable nut 10, and the movable nut 10 is sleeved outside the screw 43 and is in threaded connection with the screw 43. Through the cooperation between the movable nut 10 and the screw 43, it is ensured that the rectangular movable plate 42 is vertically lifted along the screw 43 in the process of clockwise or counterclockwise rotation of the screw 43.

The side of the shell 1 is rotatably provided with a knob 9, and the end part of the screw 43 penetrates through the shell 1 and is fixedly connected with the middle part of the knob 9. The screw 43 can be conveniently and rapidly rotated by an operator through the knob 9.

Thread bush and shell 1 are integrated into one piece structure, and shell 1, rectangle stop collar 41, rectangle fly leaf 42 and screw rod 43 are insulating rubber material and make, guarantee insulating properties, place the normal operation of electronic equipment such as static influence pressure sensor 5.

The shell 1 is provided with a buzzer 8, and the buzzer 8 is electrically connected with the singlechip 6. When a large current passes through the space between the movable contact rod 3 and the static contact rod 2, the generated electric repulsive force pushes the movable contact rod 3 and the static contact rod 2 to be away from each other, the upper end of the compression spring 44 and the rectangular movable plate 42 are squeezed to generate squeezing force, when the pressure detected by the pressure sensor 5 exceeds a set value, the single chip microcomputer 6 sends a starting signal to the buzzer 8, and the buzzer 8 makes a sound to prompt a maintenance worker.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (5)

1. A current limiting device of a quick circuit breaker comprises a shell (1), a static contact rod (2) and a movable contact rod (3) which are arranged inside the shell (1), wherein an elastic pressing and holding mechanism (4) on the shell (1) presses and holds one side of the movable contact rod (3) so that contacts on opposite surfaces of the movable contact rod (3) and the static contact rod (2) are pressed and held together, and the current limiting device is characterized in that: the elastic pressing and holding mechanism (4) comprises a rectangular limiting sleeve (41) fixedly arranged on the inner wall of the shell (1), a rectangular movable plate (42) arranged in the rectangular limiting sleeve (41) in a sliding mode, a screw rod (43) penetrating through the middle of the rectangular movable plate (42) and in threaded connection with the rectangular movable plate (42), and a compression spring (44) arranged right below the rectangular limiting sleeve (41) and fixedly connected with the static contact rod (2);

the middle part of rectangle fly leaf (42) is provided with pressure sensor (5), pressure sensor (5) and singlechip (6) electric connection on shell (1) lateral wall, singlechip (6) will be followed the signal of telecommunication conversion that pressure sensor (5) received and are shown for electronic screen (7) that shell (1) outside set up for digital signal transmission.

2. The current limiting apparatus of a quick circuit breaker according to claim 1, wherein: the middle part of the rectangular movable plate (42) is fixedly provided with a movable nut (10), and the movable nut (10) is sleeved on the outer side of the screw rod (43) and is in threaded connection with the screw rod (43).

3. The current limiting apparatus of a quick circuit breaker according to claim 1, wherein: the side of the shell (1) is rotatably provided with a knob (9), and the end part of the screw rod (43) penetrates through the middle part of the shell (1) and the knob (9) to be fixedly connected.

4. The current limiting apparatus of a quick circuit breaker according to claim 1, wherein: the thread bush and the shell (1) are of an integrated structure, and the shell (1), the rectangular limiting bush (41), the rectangular movable plate (42) and the screw (43) are all made of insulating rubber materials.

5. The current limiting apparatus of a quick circuit breaker according to claim 1, wherein: the shell (1) is provided with a buzzer (8), and the buzzer (8) is electrically connected with the single chip microcomputer (6).

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