Breaker with real-time contact force monitoring

Abstract

The application discloses a circuit breaker capable of monitoring contact pressure in real time, which comprises a shell, a movable contact arranged in the shell, a static contact and a pressure sensor, one end of the static contact is a contact part, the other end of the static contact is a fixed part fixed on the shell, the contact part and the fixed part of the static contact are in conduction, a static silver point matched with the movable contact is arranged on one side surface of the contact part of the static contact, the pressure sensor is arranged between the other side surface of the contact part and a bottom plate of the shell, and the pressure sensor is connected with an intelligent controller or a separate display module; when the circuit breaker is closed, the movable contact presses the static silver point, the final pressure between the movable contact and the static silver point is transmitted to the pressure sensor, and the pressure sensor transmits information to the intelligent controller or the separate display module. The application aims at overcoming the defects of the prior art, and provides the circuit breaker capable of monitoring the contact pressure in real time, which has simple structure, improves the reliability of the product, and is convenient and timely for finding operation abnormities.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to a circuit breaker capable of monitoring contact pressure in real time. BACKGROUND

[0002] Generally, low-voltage circuit breakers, especially low-voltage universal circuit breakers, have a compression force (hereinafter referred to as contact final compression force) between the moving contact and the static contact in the closed state. The contact final compression force is a key parameter of the circuit breaker, which directly affects the performance of the product. In the prior art, the contact pressure value is determined by simulating the opening and closing movement of the circuit breaker contact during the assembly and debugging stage of the circuit breaker. However, it cannot be used in the normal running power-on situation. So far, no product has been found that can monitor the contact final compression force in real time under power-on condition, and the running state of the product cannot be monitored in real time. SUMMARY

[0003] The purpose of the present application is to overcome the defects of the prior art, provide a circuit breaker capable of monitoring contact pressure in real time, which has a simple structure, improves the reliability of the product, and facilitates the timely discovery of abnormal operation.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A circuit breaker capable of monitoring contact pressure in real time, comprising a shell, a moving contact, a static contact and a pressure sensor arranged in the shell. One end of the static contact is a contact part, and the other end is a fixed part fixed on the shell. The contact part and the fixed part of the static contact are in conduction. A static silver point matched with the moving contact is arranged on one side surface of the contact part of the static contact. The other side surface of the contact part and the bottom plate of the shell are provided with the pressure sensor. The pressure sensor is used to connect with an intelligent controller or a separate display module. When the circuit breaker is closed, the moving contact compresses the static silver point, and the final compression force between the moving contact and the static silver point is transmitted to the pressure sensor. The pressure sensor transmits information to the intelligent controller or the separate display module.

[0006] Preferably, a containing groove is arranged on the bottom plate, the pressure sensor is installed in the containing groove, and a pad is arranged between the pressure sensor and the contact part of the static contact. The pad is placed in the containing groove and can slide in the depth direction of the containing groove.

[0007] Preferably, one side surface of the pad is a contact surface in contact with the contact part of the static contact, and the other side surface is a transmission surface in contact with the pressure sensor. The edge of the transmission surface of the pad is protruding or flush with the edge of the contact surface, and the size of the transmission surface of the pad is less than or equal to the size of the pressure sensor.

[0008] Preferably, the containing groove is a square groove, the pressure sensor is a square pressure sensor, and the pad is a cuboid.

[0009] Preferably, the cushion is a heat insulation and insulation piece.

[0010] Preferably, the pressure sensor is a high-temperature pressure sensor, which is installed on the bottom plate and directly connected with the contact part of the static contact when the circuit breaker is closed.

[0011] Preferably, the pressure sensor is fixed on the contact part of the static contact, and the pressure sensor is in contact with the bottom plate when the circuit breaker is closed.

[0012] Preferably, the fixed part of the static contact is fixed on the bottom plate of the shell, and is separated from the contact part, and the fixed part and the contact part are connected through a soft connection.

[0013] Preferably, the static contact is further provided with an arc striking sheet, one end of the arc striking sheet is connected to the contact part of the static contact, and the other end of the arc striking sheet is raised and parallel to and spaced from the fixed part.

[0014] Preferably, the pressure sensor is a thin film pressure sensor.

[0015] The circuit breaker capable of monitoring the contact pressure in real time of the present application realizes real-time monitoring of the contact pressure during the use of the circuit breaker by providing the pressure sensor between the opposite surface of the static silver point of the static contact and the shell, and the role of monitoring the contact pressure is to determine the contact wear condition and determine whether the contact can still be used normally, thereby playing a role of monitoring the running state of the circuit breaker, facilitating the timely discovery of abnormal running conditions, and improving the reliability of the product. The structure is simple, compact and reasonable. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a side view of part of the structure of the circuit breaker of the present application;

[0017] Figure 2 is a side view of the static contact of the present application;

[0018] Figure 3 is a front view of the static contact of the present application;

[0019] Figure 4 is an exploded view of part of the structure of the shell of the present application. DETAILED DESCRIPTION

[0020] The following embodiments are given in conjunction with the Figures 1 to 4 The circuit breaker capable of monitoring the contact pressure in real time of the present application is not limited to the description of the following embodiments.

[0021] As Figure 1 andFigure 2 As shown, the circuit breaker of the present invention, capable of real-time monitoring of contact pressure, includes a housing 4, a moving contact 5, a stationary contact 1, and a pressure sensor 3 disposed within the housing 4. One end of the stationary contact 1 is a contact portion 11, and the other end is a fixing portion 13 fixed to the housing 4 for electrical connection with a downstream connection bar (not shown in the figure). The contact portion 11 and the fixing portion 13 of the stationary contact 1 are electrically connected. A stationary silver point 10 that mates with the moving contact 5 is provided on one side of the contact portion 11 of the stationary contact 1. A pressure sensor 3 is provided between the other side of the contact portion 11 and the bottom plate 40 of the housing 4. The pressure sensor 3 is connected to an intelligent controller or a separate display module (not shown in the figure). When the circuit breaker is closed, the moving contact 5 presses the stationary silver point 10 tightly. The final pressure between the moving contact 5 and the stationary silver point 10 is transmitted to the pressure sensor 3, which transmits the information to the intelligent controller or a separate display module for user observation. The circuit breaker of the present invention, capable of real-time monitoring of contact pressure, utilizes a pressure sensor positioned between the opposite side of the stationary contact's silver point and the housing. This allows for real-time monitoring of contact pressure during the circuit breaker's operation. Monitoring contact pressure helps determine the wear condition of the contacts and whether they are still usable, thus monitoring the circuit breaker's operating status and facilitating timely detection of operational anomalies. The structure is simple, improving product reliability. Furthermore, the pressure sensor's placement between the stationary contact and the housing does not interfere with internal components such as the wiring of the moving contact, resulting in a simple and compact structure.

[0022] like Figures 1-4 As shown, in one embodiment of the circuit breaker of the present invention capable of real-time monitoring of contact pressure, a pad 2 is provided between the pressure sensor 3 and the contact portion 11 of the stationary contact 1. A receiving groove 400 is provided on the base plate 40. The pressure sensor 3 is installed in the receiving groove 400, and the pad 2 is placed within the receiving groove 400. The pad 2 can be positioned within the receiving groove 400 in the depth direction (e.g., ...). Figure 1 The contact point 11 of the stationary contact 1 contacts the pad 2 when the circuit breaker is closed, and the final pressure between the moving contact 5 and the stationary contact 10 is transmitted to the pressure sensor 3 through the pad 2. In this embodiment, the pad 2 is a heat-insulating component. It effectively isolates the heat on the stationary contact from being transmitted to the pressure sensor through the pad, and also prevents the pressure sensor from directly contacting the conductive system, thereby preventing measurement deviations caused by high temperatures, improving the accuracy of contact pressure measurement, preventing electrical breakdown, and reducing the environmental requirements for the pressure sensor.

[0023] In the embodiment, one side of the cushion block 2 is a contact surface 20 in contact with the contact part 11 of the static contact 1, and the other side is a transmission surface in contact with the pressure sensor 3. The edge of the transmission surface of the cushion block 2 is protruded or flush with the edge of the contact surface 20, and the size of the transmission surface of the cushion block 2 is less than or equal to the size of the pressure sensor 3 (i.e. when the cushion block 2 is placed on the pressure sensor 3, the transmission surface of the cushion block 2 can be entirely on the pressure sensor 3 without a protruding part). The force on the part outside the sensing area of the pressure sensor is prevented, and the measurement accuracy of the contact pressure is improved.

[0024] Specifically, as shown in Figure 4 , the accommodating groove 400 is a square recess, the pressure sensor 3 is a square pressure sensor, and the cushion block 2 is a cuboid, i.e. the edge of the transmission surface of the cushion block 2 is flush with the edge of the contact surface 20, i.e. the size of the contact surface 20 of the cushion block 2 is equal to the size of the transmission surface. The length L1 of the cushion block 2 is less than or equal to the length L2 of the pressure sensor 3, and the width W1 of the cushion block 2 is less than or equal to the width W2 of the pressure sensor 3.

[0025] In the second embodiment of the circuit breaker capable of monitoring the contact pressure in real time of the present application, the pressure sensor 3 is a high-temperature pressure sensor 3, which is installed on the bottom plate 40 and directly connected with the contact part 11 of the static contact 1 when the circuit breaker is closed.

[0026] In the third embodiment of the circuit breaker capable of monitoring the contact pressure in real time of the present application, the pressure sensor 3 is fixed on the contact part 11 of the static contact 1, and is not in contact with the bottom plate 40 when the circuit breaker is opened, and is directly or indirectly in contact with the bottom plate 40 when the circuit breaker is closed.

[0027] As shown in Figure 2 and Figure 3 , in the structure of the static contact of the present application, the fixed part 13 of the static contact 1 is fixed on the bottom plate 40 of the housing 4 and is separately provided from the contact part 11, and the fixed part 13 and the contact part 11 are connected through the soft connection 12 to realize the conduction therebetween. The soft connection 12 is stacked by soft copper sheets and has a certain movability, but will not be too soft to cause the contact part 11 to shake and affect the performance. The traditional static contact is generally of a whole structure and is fixed with the bottom plate. Such an installation structure will generate a pre-tightening force on the static contact and will interfere with the pressure sensor. The static contact 1 of the present application is separately provided with the fixed part 13 and the contact part 11 and is connected through the soft connection 12 having a certain movability, which can prevent the pre-tightening force generated by the fixed part 13 of the static contact 1 being fastened on the bottom plate 40 from interfering with the pressure sensor, and improve the measurement accuracy of the contact pressure. Meanwhile, the present application can also prevent the additional force generated by the connection between the rear busbar and the fixed part 13 of the static contact 1 after the main busbar of the product is connected, increase the stress points, and affect the measurement of the contact pressure between the moving contact 5 and the static contact 1.

[0028] In addition, as shown in Figure 2 and Figure 3 The static contact 1 is further provided with an arc striking piece 14, one end of the arc striking piece 14 is connected to the contact part 11 of the static contact 1, and the other end of the arc striking piece 14 is raised and parallel to and spaced from the fixed part 13. The arc striking piece 14 comprises a circular arc end head 141, a transition section 142 and a connecting part 143 connected in sequence, the width of the transition section 142 is smaller than the width of the circular arc end head 141 and the connecting part 143, so that the transition section 142 is connected in a concave manner between the circular arc end head 141 and the connecting part 143, one end of the connecting part 143 of the arc striking piece 14 is connected to the contact part 11 of the static contact 1, and the other end is raised and flushly connected with the transition section 142. The arc striking piece 14 is further provided with a waist-shaped hole 140, the length of the waist-shaped hole 140 is relatively long, and the waist-shaped hole 140 extends on the circular arc end head 141, the transition section 142 and the connecting part 143.

[0029] The pressure sensor 3 of the present application adopts a thin film pressure sensor. It should be noted that the pressure sensor 3, the intelligent controller or the separate display module are all commercially available products, and the pressure sensor monitors the pressure and transmits the information to the intelligent controller or the separate display module to display is also a prior art that can be realized.

[0030] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be considered as falling within the protection scope of the present application.

Claims

1. A circuit breaker capable of real-time monitoring of contact pressure, characterized in that: The device includes a housing (4), a moving contact (5), a stationary contact (1), and a pressure sensor (3) disposed within the housing (4). One end of the stationary contact (1) is a contact portion (11), and the other end is a fixing portion (13) fixed to the housing (4). The contact portion (11) and the fixing portion (13) of the stationary contact (1) are electrically connected. One side of the contact portion (11) of the stationary contact (1) is provided with a stationary silver point (10) that cooperates with the moving contact (5), and the other side of the contact portion (11) is connected to the housing. The pressure sensor (3) is provided between the base plate (40) of (4) for real-time monitoring of contact pressure during the operation of the circuit breaker; the fixing part (13) of the stationary contact (1) is fixed on the base plate (40) of the housing (4) and is separately set from the contact part (11). The fixing part (13) and the contact part (11) are connected by a soft connection (12) to prevent the pre-tightening force generated by the fixing part (13) of the stationary contact (1) being fastened to the base plate (40) from interfering with the pressure sensor.

2. The circuit breaker capable of real-time monitoring of contact pressure according to claim 1, characterized in that: The base plate (40) is provided with a receiving groove (400), the pressure sensor (3) is installed in the receiving groove (400), and a pad (2) is provided between the pressure sensor (3) and the contact part (11) of the stationary contact (1). The pad (2) is placed in the receiving groove (400) and can slide in the depth direction of the receiving groove (400).

3. The circuit breaker capable of real-time monitoring of contact pressure according to claim 2, characterized in that: One side of the pad (2) is a contact surface (20) that contacts the contact portion (11) of the stationary contact (1), and the other side is a transmission surface that contacts the pressure sensor (3). The edge of the transmission surface of the pad (2) protrudes or is flush with the edge of the contact surface (20), and the size of the transmission surface of the pad (2) is smaller than or equal to the size of the pressure sensor (3).

4. The circuit breaker capable of real-time monitoring of contact pressure according to claim 3, characterized in that: The receiving groove (400) is a square groove, the pressure sensor (3) is a square pressure sensor, and the pad (2) is a cuboid.

5. The circuit breaker capable of real-time monitoring of contact pressure according to claim 2, characterized in that: The pad (2) is a heat insulation component.

6. The circuit breaker capable of real-time monitoring of contact pressure according to claim 1, characterized in that: The pressure sensor (3) is a high-temperature pressure sensor (3), which is installed on the base plate (40) and directly contacts the contact part (11) of the stationary contact (1) when the circuit breaker is closed.

7. The circuit breaker capable of real-time monitoring of contact pressure according to claim 1, characterized in that: The pressure sensor (3) is fixed on the contact part (11) of the stationary contact (1). When the circuit breaker is closed, the pressure sensor (3) contacts the base plate (40).

8. The circuit breaker capable of real-time monitoring of contact pressure according to claim 1, characterized in that: The stationary contact (1) is also provided with an arc-guiding plate (14). One end of the arc-guiding plate (14) is connected to the contact portion (11) of the stationary contact (1), and the other end of the arc-guiding plate (14) is raised and parallel to and spaced apart from the fixing portion (13).

9. The circuit breaker capable of real-time monitoring of contact pressure according to any one of claims 1-7, characterized in that: The pressure sensor (3) is a thin-film pressure sensor.

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