阅读说明：本技术 一种具有触指弹簧力监测功能的断路器触头系统 (Circuit breaker contact system with contact finger spring force monitoring function ) 是由 万祥军 周春龙 周柳 陆旻 于 2020-05-21 设计创作，主要内容包括：本发明提供了一种具有触指弹簧力监测功能的断路器触头系统,其特征在于,触头支持具有一个腔体,压力传感器设于腔体内,且触头弹簧的一端正好压合在压力传感器的对应工作区域,压力传感器通过输出导线与外部的控制器相连,触头弹簧一直作用在压力传感器的对应工作区域。本发明的优点是：结构简单、零部件少、便于安装；安装隐蔽,不受触头分断电弧、温升影响；原理简单易行,便于工程化。(The invention provides a circuit breaker contact system with a contact finger spring force monitoring function, which is characterized in that a contact support is provided with a cavity, a pressure sensor is arranged in the cavity, one end of a contact spring is just pressed in a corresponding working area of the pressure sensor, the pressure sensor is connected with an external controller through an output lead, and the contact spring always acts on the corresponding working area of the pressure sensor. The invention has the advantages that: the structure is simple, the parts are few, and the installation is convenient; the installation is hidden, and the influence of the disjunction electric arc and temperature rise of the contact is avoided; the principle is simple and easy to implement, and engineering is facilitated.)

1. A circuit breaker contact system with a contact finger spring force monitoring function comprises a contact support (1), wherein a spring mounting hole (13) is formed in the contact support (1), one end of a contact spring (3) is mounted in the spring mounting hole (13), the other end of the contact spring is fixedly connected with a contact finger (9) arranged on a fixed clamping plate (8), the contact finger (9) can rotate around a rotating shaft (4) on the fixed clamping plate (8), the fixed clamping plate (8) is arranged on the contact support (1), the circuit breaker contact system is characterized in that the contact support (1) is provided with a cavity (11), a pressure sensor (2) is arranged in the cavity (11), one end of the contact spring (3) is just pressed in a corresponding working area (21) of the pressure sensor (2), the pressure sensor (2) is connected with an external controller through an output lead (22), and the contact spring (3) always acts on the corresponding working area (21) of the pressure sensor (2), along with the change of the rotation angle of the contact finger (9), the compression amount of the contact spring (3) is changed, so that the pressure of the contact spring (3) pressed on a corresponding working area (21) of the pressure sensor (2) is changed along with the change of the compression amount, the pressure sensor (2) outputs a signal along with the change of the pressure of the contact spring (3) in real time, and after the signal is calculated by an external controller, the residual service life value or the residual service life percentage value of the contact system of the circuit breaker is quantitatively displayed in real time.

2. The circuit breaker contact system with finger spring force monitoring function as claimed in claim 1, wherein the cavity (11) is arranged in coupling with the bottom of the spring mounting hole (13).

3. The circuit breaker contact system with the function of monitoring the spring force of the contact finger according to claim 1, wherein when the external controller operates the signal, the real-time signal obtained by the pressure sensor (2) is compared with an internal preset rated value or initial value and a minimum value or terminal value, and the remaining life value or the percentage value of the remaining life of the circuit breaker contact system is displayed quantitatively in real time.

4. The circuit breaker contact system with the function of monitoring the spring force of the contact finger as claimed in claim 1, wherein the external controller is further connected with an early warning system for reminding a user to replace the circuit breaker with the service life of the circuit breaker contact system close to the end value of the full life cycle in time.

5. The contact system of a circuit breaker with finger spring force monitoring function according to claim 1, characterized in that the contact support 1 is provided with a wiring groove (12) for facilitating the wiring of the output conductor (22), and the wiring groove (12) is connected with the cavity (11).

Technical Field

The invention relates to a frame type circuit breaker contact system with a contact finger spring force monitoring function, and belongs to the field of low-voltage electrical appliances.

Background

The frame-type circuit breaker is an important component in a low-voltage distribution system, is usually used as an inlet main switch or a branch main switch for distributing electric energy in a distribution network, protecting circuits, power supply equipment and the like, and avoids the damage of faults such as overload, undervoltage, short circuit, single-phase grounding and the like. The existing frame-type circuit breaker contact system mainly comprises a contact support, a contact spring, a rotating shaft, a fastener, a bracket, a bus, a fixed clamping plate, a contact finger, a contact, a connecting rod and other parts. When the circuit breaker works in a distribution circuit, a moving contact and a fixed contact of the circuit breaker are required to be connected with larger normal current or short circuit and overload current, so that a moving contact of the circuit breaker needs certain final pressure to overcome electric repulsion force generated by the current, and the pressure of a contact finger of a contact system is provided by a contact spring arranged in a contact support, so that the pressure value of the contact spring is a very critical parameter in the normal operation process of the circuit breaker. The pressure of the contact spring comprehensively reflects the temperature around the contact finger of the contact system, the abrasion or/and burning loss of the contact, the installation state of the contact spring and other contact system states. The contact support is generally molded integrally from flame-retardant insulating plastic and is provided with a hole for mounting a spring.

Disclosure of Invention

The purpose of the invention is: the contact system of the circuit breaker can directly reflect the pressure value or the value change of the contact spring.

In order to achieve the above object, the technical scheme of the invention is to provide a circuit breaker contact system with a contact finger spring force monitoring function, which comprises a contact support, wherein a spring mounting hole is arranged in the contact support, one end of a contact spring is mounted in the spring mounting hole, the other end of the contact spring is fixedly connected with a contact finger arranged on a fixed clamping plate, the contact finger can rotate around a rotating shaft on the fixed clamping plate, and the fixed clamping plate is arranged on the contact support. The pressure sensor outputs a signal which changes along with the pressure of the contact spring in real time, and after the signal is calculated by an external controller, the residual service life value or the residual service life percentage value of the contact system of the circuit breaker is quantitatively displayed in real time.

Preferably, the cavity is coupled to a bottom of the spring mounting hole.

Preferably, when the external controller operates the signal, the real-time signal obtained by the pressure sensor is compared with an internal preset rated value or initial value and a minimum value or terminal value, and the residual life value or the residual life percentage value of the contact system of the circuit breaker is displayed quantitatively in real time.

Preferably, the external controller is further connected with an early warning system to remind a user of timely replacing the circuit breaker with the service life of the circuit breaker contact system close to the end value of the full life cycle.

Preferably, the contact support is provided with a wiring groove for facilitating wiring of the output wire, and the wiring groove is connected with the cavity.

The invention can provide a breaker contact system with a function of monitoring the spring force of a contact finger, a pressure sensor can be installed in the breaker contact system, the pressure value or the change condition of the value of the spring of the contact system can be intuitively monitored in real time through the real-time output of the sensor, the running state of the contact system and the breaker thereof is directly reflected, the service life cycle use condition of the contact system can be quantitatively monitored to a certain extent, and a user can conveniently and timely replace the breaker with the operation times close to the end of the full service life cycle. The popularization and the application of the invention can better monitor the service state and the service life cycle of the circuit breaker, improve the safety and the stability of a power distribution system, and bring convenience to the daily inspection, maintenance and replacement of the circuit breaker.

The invention has the advantages that:

1) the structure is simple, the parts are few, and the installation is convenient;

2) the installation is hidden, and the influence of the disjunction electric arc and temperature rise of the contact is avoided;

3) the principle is simple and easy to implement, and engineering is facilitated.

Drawings

Figure 1 is a diagram of a contact support structure of the contact system of the present invention;

FIG. 2 is a schematic view of a sensor;

FIG. 3 is a schematic view of a contact spring and sensor installation;

figure 4 is a diagram of a contact system of the present invention.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

As shown in fig. 4, the contact system of the circuit breaker provided by the invention comprises a contact support 1, a pressure sensor 2, a contact spring 3, a rotating shaft 4, a fastener 5, a bracket 6, a bus 7, a fixed clamp plate 8, a contact finger 9, a contact 10 and other parts.

The contact support 1 is generally molded integrally from flame-retardant insulating plastic and is provided with spring mounting holes 13 for mounting the contact springs 3. Meanwhile, the contact support 1 of the invention is provided with a cavity 11 for mounting the pressure sensor 2, the cavity 11 is coupled with the bottom of the spring mounting hole 13, the pressure sensor 2 is mounted in the cavity 11, and one end of the contact spring 3 is just pressed in a corresponding working area 21 of the pressure sensor 2.

The contact support 1 is provided with a wiring groove 12 for facilitating the routing of an output wire 22, and the pressure sensor 2 is connected with an external controller through the output wire 22. The wiring duct 12 is connected to the chamber 11. The contact spring 3 and the pressure sensor 2 are installed in the contact support 1 as shown in fig. 3 and 4, and the contact spring 3 is positively pressed on one side of the contact finger 9, so that the contact finger 9 can freely rotate around the rotating shaft 4. The contact spring 3 is always acted on the corresponding working area 21 of the pressure sensor 2, and the change of the compression amount of the contact spring 3 is caused along with the change of the rotation angle of the contact finger 9, so that the pressure of the contact spring 3 pressed on the corresponding working area 21 of the pressure sensor 2 is changed along with the change of the compression amount, and the pressure sensor 2 can output a signal (such as a voltage signal) which is in one-to-one correspondence with the pressure of the contact spring 3 in real time. After the operation of the external controller, the real-time signal is compared with an internal preset rated value (or initial value) and a minimum value (or terminal value), and the residual life value (or percentage value of the residual life) of the contact system is quantitatively displayed in real time. The technical personnel in the field can also set an early warning system to remind a user to replace the circuit breaker with the service life of the circuit breaker contact system close to the end value of the whole service life cycle in time.