An auxiliary contact mechanically interlocked and linked with a low-voltage circuit breaker

Abstract

The present invention relates to an auxiliary contact linked with a mechanical interlock of a low-voltage circuit breaker, including a bracket (2). Among them, a microswitch (4) and a pressing plate (3) that can rotate up and down are installed on the bracket (2). One end of the pressing plate (3) is connected to the mechanical interlock device, and the other end of the pressing plate (3) is arranged opposite to the contact of the microswitch (4). The mechanical interlock device drives the pressing plate (3) to rotate up and down, so that one end of the pressing plate (3) contacts or separates from the contact of the microswitch (4), thereby realizing the pressing and relaxation of the microswitch (4). Compared with the prior art, the present invention does not occupy the spatial position of the mechanical interlock device during installation, and can achieve simultaneous operation with the main shaft of the internal mechanism outside the circuit breaker to complete the switching of the on-off state of the microswitch contacts.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage circuit breakers, and in particular to an auxiliary contact that is mechanically interlocked with a low-voltage circuit breaker. Background Art

[0002] Low-voltage circuit breakers play a role in distributing electric energy in a power distribution line and protecting the line, power source, and electrical equipment from faults such as overload, undervoltage, short circuit, and grounding. Auxiliary contacts are one of the main accessories of low-voltage circuit breakers. They are usually installed above the circuit breaker mechanism and act simultaneously with the main contacts of the circuit breaker. They can output the opening and closing signals of the circuit breaker. Due to the limited internal space of the circuit breaker, generally only a small number of auxiliary contacts can be installed.

[0003] With the development of low-voltage electrical technology, the requirements of the power grid communication for the secondary circuit of the circuit breaker are getting higher and higher. In some cases, users need a larger number of auxiliary contacts to achieve functions such as communication, indication, and interlock. The existing low-voltage circuit breaker auxiliary contact devices at home and abroad generally have a complex structure and numerous parts, and the number of auxiliary contacts is usually fixed and small, which cannot meet the user's demand for a large-capacity auxiliary contact.

[0004] Installing an external auxiliary contact is a feasible solution to solve such problems. It can provide more auxiliary contacts while effectively utilizing the remaining space in the distribution cabinet. The existing external auxiliary contacts generally use a mechanical transmission device to link the auxiliary contacts outside the circuit breaker with the main shaft of the internal mechanism of the circuit breaker, and switch the states of the normally open and normally closed points when the main shaft is closed. However, this device will occupy the position originally installed with the mechanical interlock and cannot be installed and used simultaneously with the mechanical interlock. The mechanical interlock of the circuit breaker is used for the mutual interlock between multiple circuit breakers to prevent two or three circuit breakers from being in the closed position at the same time. At present, many power supply and distribution systems are equipped with standby emergency power supplies. The mechanical interlock plays a crucial role in improving the safety and reliability of the power supply and distribution system and is a very necessary accessory. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art and provide an auxiliary contact that is mechanically interlocked with a low-voltage circuit breaker. While installing the mechanical interlock, it can achieve the linkage between the outside of the circuit breaker and the main shaft of the internal mechanism of the circuit breaker, thereby completing the switching of the on-off states of the microswitch contacts and meeting the demand for a large-capacity auxiliary contact.

[0006] The object of the present invention can be achieved by the following technical solutions: An auxiliary contact linked with a mechanical interlock of a low-voltage circuit breaker, including a bracket, on which a microswitch and a pressing plate that can rotate up and down are installed. One end of the pressing plate is connected to the mechanical interlock device, and the other end of the pressing plate is arranged opposite to the contact of the microswitch. The mechanical interlock device drives the pressing plate to rotate up and down, so that one end of the pressing plate contacts or separates from the contact of the microswitch, so as to realize the pressing and releasing of the microswitch.

[0007] Further, the microswitch is an upper row microswitch and / or a lower row microswitch. The mechanical interlock device drives the pressing plate to rotate up and down, so as to realize the pressing and releasing of the upper row microswitch and / or the lower row microswitch.

[0008] Further, the bracket is installed outside the right side plate of the circuit breaker drawer seat and is located on one side of the mechanical interlock device.

[0009] Further, the bracket is fixedly installed outside the right side plate of the circuit breaker drawer seat by screws.

[0010] Further, the bracket is of a U-shaped structure. Mounting holes for installing the pressing plate and the microswitch are symmetrically opened on both side plates of the bracket. An installation shaft is connected between the mounting holes on both side plates. The installation shaft passes through the pressing plate and the microswitch respectively, so as to install the pressing plate and the microswitch on the bracket.

[0011] Further, the pressing plate includes a flat plate and bending parts located on both sides of the flat plate. One end of the flat plate is arranged opposite to the contact of the microswitch. The other end of the flat plate is a hook connecting part. The hook connecting part is clamped on the fixed shaft of the mechanical interlock device. A through hole for passing through the installation shaft is opened on the bending part.

[0012] Further, a pin is arranged between the side plate of the bracket and the outside of the right side plate of the circuit breaker drawer seat. The pin is riveted on the side plate of the bracket. The screw passes through the pin to fixedly install the bracket outside the right side plate of the circuit breaker drawer seat.

[0013] Further, the length of the pin is greater than or equal to the length of the installation shaft protruding from the installation hole.

[0014] Further, a retaining ring for preventing the installation shaft from sliding is sleeved between the installation shaft and the installation hole.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] First, the present invention is installed on one side of the mechanical interlock device outside the right side plate of the circuit breaker drawer seat, without occupying the original space position for installing the mechanical interlock device. And by using the linkage relationship between the pressing plate and the mechanical interlock device, the switching of the on-off state of the microswitch contacts can be effectively realized.

[0017] Second, the present invention adopts a hook - type design, enabling one end of the pressure plate to be reliably clamped on the fixed shaft of the mechanical interlocking device. Thus, when the main shaft of the internal mechanism of the circuit breaker operates, the pressure plate can be driven to rotate simultaneously through the fixed shaft, achieving the synchronism of linkage.

[0018] Third, the present invention is provided with micro - switches above or below or both above and below the pressure plate. The number of micro - switches can be set according to user requirements. In addition, both the pressure plate and the micro - switches are installed on the bracket by means of mounting shafts, with simple structure and convenient for installation and disassembly. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the structure of the auxiliary contact in the embodiment;

[0020] Figure 2 It is a schematic diagram of the external shape structure of the bracket in the embodiment;

[0021] Figure 3 It is a schematic diagram of the external shape structure of the pressure plate in the embodiment;

[0022] Figure 4 It is a schematic diagram of the installation process of the auxiliary contact in the embodiment;

[0023] Figure 5 It is a schematic diagram of the installation effect of the auxiliary contact in the opening state in the embodiment;

[0024] Figure 6 It is a schematic diagram of the connection between the mechanical interlocking device and the interior of the circuit breaker in the opening state in the embodiment;

[0025] Figure 7 It is a schematic diagram of the connection between the mechanical interlocking device and the interior of the circuit breaker in the closing state in the embodiment;

[0026] Figure 8 It is a schematic diagram of the installation effect of the auxiliary contact in the closing state in the embodiment;

[0027] Explanation of the marks in the figure: 1. Pin, 2. Bracket, 3. Pressure plate, 301. Flat plate, 302. Bending part, 303. Hook connection part, 4. Micro - switch, 5. Mounting shaft, 6. Retaining ring, 7. Fixed shaft, 8. Driving shaft, 9. Interlocking rod, 10. Mechanical interlocking device mounting plate, 11. Right side plate of the circuit breaker drawer seat, 12. First connecting rod, 13. Connecting pin, 14. Second connecting rod, 15. Main shaft of the internal mechanism of the circuit breaker. Detailed Embodiment

[0028] The present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0029] Embodiment

[0030] As Figures 1 to 2 shown, an auxiliary contact linked with the mechanical interlock of a low-voltage circuit breaker includes a bracket 2, on which a pressing plate 3 that can rotate up and down is installed. In this embodiment, micro switches 4 are installed above and below the pressing plate 3. The micro switch includes multiple wiring terminals, that is, contacts. When the contact of the micro switch is pressed, the corresponding contact closes; when the contact of the micro switch is relaxed, the corresponding contact disconnects. In actual application, according to user requirements, the micro switch 4 can be installed above or below the pressing plate 3, and the number of micro switches 4 can be set according to user requirements. Both the pressing plate 3 and the micro switch 4 are installed on the bracket 2 through a mounting shaft 5. The pressing plate 3 can rotate up and down around the mounting shaft 5 to realize the switching between the upper and lower rows of micro switches.

[0031] Specifically, the bracket 2 adopts a U-shaped structure, including two bending designs. Mounting holes for passing through the mounting shaft 5 are symmetrically opened on both side plates of the bracket 2. Both ends of the mounting shaft 5 extend out of the mounting holes, and a retaining ring 6 is sleeved between the mounting shaft 5 and the mounting holes to prevent the mounting shaft 5 from sliding. A pin 1 is riveted on one side plate of the bracket 2, and the length of the pin 1 is greater than or equal to the length of the mounting shaft 5 extending out of the mounting holes to reserve the extending space of the mounting shaft 5. After the screw passes through the pin 1, the bracket 2 can be fixedly installed on the right side plate of the circuit breaker drawer seat.

[0032] The structure of the pressing plate 3 is as Figure 3 shown, including a flat plate 301. One end of the flat plate 301 faces the contact of the micro switch 4. Both sides of the flat plate 301 are bending parts 302, and through holes for passing through the mounting shaft 5 are opened on the bending parts 302. The other end of the flat plate 301 is a hook connecting part 303 to be snap-connected to the mechanical interlock device. Through the hook connecting part 303, the linkage between the present invention and the mechanical interlock device can be realized.

[0033] During actual installation, as Figure 4 shown, both the bracket 2 and the mounting plate 10 of the mechanical interlock device are fixedly installed on the outside of the right side plate 11 of the circuit breaker drawer seat through screws. The driving shaft 8, the interlocking rod 9 and the first connecting rod 12 of the mechanical interlock device are all fixedly connected, and their rotation centers are the same. Inside the right side plate 11 of the circuit breaker drawer seat, a connecting pin 13 is riveted at the top of the second connecting rod 14 and fixedly installed at the right top of the main shaft 15 of the internal mechanism of the circuit breaker through screws. The rotation centers of the second connecting rod 14 and the main shaft 15 of the internal mechanism of the circuit breaker are the same. After the mechanical interlock device is installed, the first connecting rod 12 is located inside the right side plate 11 of the circuit breaker drawer seat, and the connecting pin 13 is coaxially engaged and contacted with the semi-circular hole part of the first connecting rod 12.

[0034] As Figure 5As shown, the auxiliary contact is installed on the right side of the external mechanical interlocking device of the right side plate 11 of the circuit breaker drawer seat, and the hook part of the pressure plate 3 in the auxiliary contact is engaged with the fixed shaft 7 at the end of the interlocking rod 9, and will not shake at will, so that the pressure plate 3 can rotate together with the interlocking rod 9 of the mechanical interlock. Figure 5 In the initial state shown, the circuit breaker is in the open state, the upper row of micro switches 4 in the auxiliary contacts are in the compressed state, and the lower row of micro switches 4 are in the released state.

[0035] like Figure 6 As shown, the second connecting rod 14 is fixed at the top right side of the main shaft 15 of the internal mechanism of the circuit breaker, and can rotate together with the main shaft 15 of the internal mechanism of the circuit breaker. The connecting pin 13 is riveted to the top of the connecting rod 14 and is coaxially in contact with the semicircular hole portion of the mechanical interlocking first connecting rod 12. The connecting rod 12 is fixed at the top of the mechanical interlocking active shaft 8 and can rotate around the active shaft 8.

[0036] When the circuit breaker mechanism stores energy and then releases energy to close the circuit, the main shaft 15 of the internal mechanism of the circuit breaker moves along Figure 6 The second connecting rod 14 and the connecting pin 13 are rotated clockwise at a certain angle around the center line of the main shaft, and the driving shaft 8 and the first connecting rod 12 follow the connecting pin 13 to rotate clockwise at a certain angle. At this time, the interlocking rod 9 will rotate together with the driving shaft 8. Finally, after the circuit breaker mechanism releases energy and closes, the inner and outer structures of the right side plate 11 of the circuit breaker drawer seat are as shown in FIG. Figure 7 and Figure 8 shown.

[0037] exist Figure 8 In the process, the driving shaft 8 and the interlocking rod 9 of the mechanical interlocking device rotate counterclockwise, so that the fixed shaft 7 drives the pressure plate 3 to rotate clockwise, thereby the upper row of micro switches 4 become the released state, and the lower row of micro switches 4 become the pressed state, realizing the switching of the contact states of the upper and lower rows of micro switches.

[0038] When the mechanical interlock realizes the switching of the opening and closing states between multiple circuit breakers, the states of the upper and lower rows of micro switches of the corresponding auxiliary contacts will also be switched.

Claims

1. An auxiliary contact mechanically interlocked and linked with a low-voltage circuit breaker, characterized in that, It includes a bracket (2) on which a microswitch (4) and a pressure plate (3) that can rotate up and down are installed. One end of the pressure plate (3) is connected to a mechanical interlocking device, and the other end of the pressure plate (3) is arranged opposite to the contact of the microswitch (4). The mechanical interlocking device drives the pressure plate (3) to rotate up and down, so that one end of the pressure plate (3) contacts or separates from the contact of the microswitch (4), thereby realizing the pressing and releasing of the microswitch (4). The bracket (2) is fixedly installed outside the right side plate (11) of the circuit breaker drawer seat by screws and is located on one side of the mechanical interlocking device. The driving shaft (8), the interlocking rod (9) and the first connecting rod (12) of the mechanical interlocking device are all fixedly connected, and their rotation centers are the same. Inside the right side plate (11) of the circuit breaker drawer seat, a connecting pin (13) is riveted to the top end of the second connecting rod (14) and is fixedly installed at the top right end of the main shaft (15) of the internal mechanism of the circuit breaker by screws. The rotation centers of the second connecting rod (14) and the main shaft (15) of the internal mechanism of the circuit breaker are the same. After the mechanical interlocking device is installed, the first connecting rod (12) is located inside the right side plate (11) of the circuit breaker drawer seat, and the connecting pin (13) is coaxially engaged and contacted with the semi-circular hole part of the first connecting rod (12). The auxiliary contact is installed at the right side position of the mechanical interlocking device outside the right side plate (11) of the circuit breaker drawer seat, and the hooked part of the pressure plate (3) in the auxiliary contact is clamped and hooked on the fixed shaft (7) at the end of the interlocking rod (9) of the mechanical interlock, so that the pressure plate (3) rotates together with the interlocking rod (9) of the mechanical interlock. And the first connecting rod (12) is fixed to the top end of the driving shaft (8) of the mechanical interlock and rotates around the driving shaft (8).

2. The auxiliary contact interlocked and linked with a low-voltage circuit breaker according to claim 1, characterized in that, The microswitch (4) is an upper row microswitch and / or a lower row microswitch. The mechanical interlocking device drives the pressure plate (3) to rotate up and down to realize the pressing and releasing of the upper row microswitch and / or the lower row microswitch.

3. An auxiliary contact mechanically interlocked and linked with a low-voltage circuit breaker according to claim 1, characterized in that, The bracket (2) is of a U-shaped structure. Mounting holes for installing the pressure plate (3) and the microswitch (4) are symmetrically opened on the two side plates of the bracket (2). An installation shaft (5) is connected between the mounting holes on the two side plates. The installation shaft (5) passes through the pressure plate (3) and the microswitch (4) respectively to install the pressure plate (3) and the microswitch (4) on the bracket (2).

4. An auxiliary contact mechanically interlocked and linked with a low-voltage circuit breaker according to claim 3, characterized in that The pressure plate (3) includes a flat plate (301) and bending parts (302) located on both sides of the flat plate (301). One end of the flat plate (301) is arranged opposite to the contact of the microswitch (4). The other end of the flat plate (301) is a hooked connecting part (303). The hooked connecting part (303) is clamped on the fixed shaft (7) of the mechanical interlocking device, and through holes for passing through the installation shaft (5) are opened on the bending parts (302).

5. An auxiliary contact mechanically interlocked and linked with a low-voltage circuit breaker according to claim 3, characterized in that, A pin (1) is provided between the side plate of the bracket (2) and the outside of the right side plate of the circuit breaker drawer seat. The pin (1) is riveted on the side plate of the bracket (2), and the screw passes through the pin (1) to fixedly install the bracket (2) outside the right side plate of the circuit breaker drawer seat.

6. An auxiliary contact mechanically interlocked and linked with a low-voltage circuit breaker according to claim 5, characterized in that, The length of the pin (1) is greater than or equal to the length of the installation shaft (5) extending out of the installation hole.

7. An auxiliary contact mechanically interlocked and linked with a low-voltage circuit breaker according to claim 3, characterized in that, A retaining ring (6) for preventing the mounting shaft (5) from sliding is sleeved between the mounting shaft (5) and the mounting hole.

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