Mounting box for electric mechanism of medium-voltage circuit breaker

Abstract

The utility model discloses an electric mechanism mounting box for a medium-voltage circuit breaker, which comprises an operating part and an electric driving mechanism capable of driving the operating part to rotate, and is characterized by also comprising a motor box body, the motor box body is provided with an inner cavity, and the front side of the motor box body is provided with an opening and closing door; the operating part and the electric driving mechanism are respectively arranged in an inner cavity of the motor box body, and a through hole for the operating part to extend out is formed in the rear side wall of the motor box body; the opening and closing door is provided with a manual operation hole, the manual operation hole corresponds to the position of the operation piece, the motor box body is further provided with a movable cover plate, the movable cover plate is movably installed on the opening and closing door, and the movable cover plate can close or open the manual operation hole; the motor box body is further provided with a locking mechanism capable of powering off the electric driving mechanism when the movable cover plate opens the manual operation hole, and the locking mechanism is electrically connected with the electric driving mechanism. According to the mounting box, a chassis truck can be transformed into an electric chassis truck, the interior of a cabinet body does not need to be transformed, and operation hidden dangers are avoided.

Description

Technical Field

[0001] This utility model relates to the field of medium-voltage switchgear, and in particular to a mounting box for the electric mechanism of a medium-voltage circuit breaker. Background Technology

[0002] The KYN27 armored withdrawable AC metal-enclosed switchgear (KYN cabinet) plays a vital role in power systems and is widely used in substations. Like other products, the KYN cabinet's functionality is continuously improved through practical application to meet user requirements. In recent years, considering operator safety and improved operational efficiency, users have increasingly demanded electrically operated circuit breaker trolleys for moving the circuit breaker trolleys into and out of the KYN cabinet. This has prompted manufacturers to further improve the functionality of the KYN cabinet and equip newly designed KYN cabinets with electric chassis trolleys to meet user needs. However, a large number of older, operational units still require specialized personnel to use dedicated operating handles to move the circuit breaker trolleys into the working position or out to the test position. To reduce manpower and improve safety measures, modifications to a large number of operating units are necessary.

[0003] However, the original cabinet itself cannot be operated electrically. If the solution is to directly convert the manual chassis to an electric chassis, the internal structure of the cabinet needs to be modified. Since there are many KYN cabinet manufacturers, the chassis and cabinet structures used are diverse, making the modification difficult. Moreover, there is the issue of affecting the cabinet's warranty after the modification.

[0004] Therefore, other manufacturers are currently installing the electric operating mechanism on the outside of the KYN circuit breaker door panel. For example, CN111293622A, published on June 16, 2020, discloses a switchgear with an electric operating device. This includes a cabinet and a transport vehicle for carrying electrical equipment. The cabinet has a door, and the transport vehicle includes a body, end beams, and a lead screw. The end beams are mounted on the cabinet, and one end of the lead screw is mounted on the body, while the other end passes through the body and is mounted on the end beam. It also includes an electric operating device connected to the lead screw, which drives the body to slide relative to the end beam. The electric operating device is mounted on the door and detachably connected to it. This modification allows for electric operation via a manual chassis driven by the electric mechanism. However, the electric mechanism is exposed, with the operating hole exposed. Inserting the operating handle allows the circuit breaker to be cranked into the switchgear's insertion position, compromising the safety of maintenance personnel and posing a risk of simultaneous electric and manual operation. Furthermore, the protruding electric mechanism is not only easily bumped but also unsightly. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a medium-voltage circuit breaker electric mechanism mounting box. This electric mechanism mounting box can convert the chassis vehicle from manual to electric without modifying the cabinet interior, and can protect the electric mechanism to avoid operational hazards.

[0006] To solve the above technical problems, the following technical solution is adopted:

[0007] A mounting box for the electric mechanism of a medium-voltage circuit breaker includes an operating component and an electric drive mechanism capable of driving the operating component to rotate. The box further includes a motor housing with an inner cavity and a switch door on its front side. The operating component and the electric drive mechanism are respectively disposed within the inner cavity of the motor housing. A through hole for the operating component to extend is formed on the rear side wall of the motor housing. The switch door has a manual operation hole corresponding to the position of the operating component. The motor housing also has a movable cover plate movably mounted on the switch door, capable of closing or opening the manual operation hole. The motor housing also has a locking mechanism that de-energizes the electric drive mechanism when the movable cover plate opens the manual operation hole; the locking mechanism is electrically connected to the electric drive mechanism.

[0008] When in use, the aforementioned mounting box is directly installed on the existing door panel of the switchgear. The operating components can then connect to the chassis shaft through the access holes on the door panel. The electric mechanism mounting box is easy to install, requiring no modification to the switchgear interior. During use, the chassis can be remotely driven via the electric drive mechanism. Simultaneously, the motor box protects both the operating components and the electric drive mechanism. When manual operation is not required, the movable cover covers the manual operation hole, preventing manual operation of the chassis via the operating handle. When manual operation is needed, opening the movable cover exposes the manual operation hole, allowing the operating handle to be inserted into the operating component for manual operation. Simultaneously, the locking mechanism de-energizes the electric drive mechanism, preventing electric operation. Therefore, manual and electric operation cannot be performed simultaneously, effectively avoiding operational hazards and protecting the safety of maintenance personnel.

[0009] The aforementioned electric drive mechanism can adopt the same structure as the electric operating device in CN111293622A.

[0010] In a preferred embodiment, one end of the movable cover is hinged to the door, and the trigger end of the locking mechanism corresponds to the position of the movable cover.

[0011] In a further preferred embodiment, the motor housing is also equipped with an unlocking knob. The unlocking knob is rotatably mounted on the switch door, and the unlocking knob protrudes from the front side of the switch door. The unlocking knob is connected to the movable cover plate, which is located on the rear side of the switch door. By rotating the movable cover plate with the unlocking knob, the manual operation hole is covered or exposed. After rotation, the movable cover plate triggers the trigger end of the locking mechanism, causing the locking mechanism to de-energize the electric drive mechanism. Typically, the unlocking knob has a lock hole. When the movable cover plate is in the closed state, the unlocking knob can be locked through the lock hole to prevent unauthorized operation.

[0012] In a further preferred embodiment, the locking mechanism includes a position switch, the contacts of which correspond to the position of the movable cover. After the movable cover rotates, it presses against or moves away from the contacts of the position switch, thereby de-energizing the electric drive mechanism. After the movable cover covers the manual operation hole again, it returns to the state of moving away from or pressing against the contacts of the position switch, and the electric drive mechanism is re-energized, allowing the chassis vehicle to be driven electrically.

[0013] In a further preferred embodiment, the locking mechanism further includes a position switch spring. The position switch spring has a mounting end and a contact end. The mounting end of the position switch spring is mounted on the position switch, the contact end of the position switch spring corresponds to the position of the movable cover plate, and the middle part of the position switch spring corresponds to the contact position of the position switch. By adding the position switch spring using a lever mechanism, it is ensured that the position switch change is triggered only after the movable cover plate has undergone a significant rotation, preventing the electric drive mechanism from easily losing power due to misoperation. Furthermore, the positions of the movable cover plate and the position switch are easier to set.

[0014] In a further preferred embodiment, the movable cover plate is provided with a contact slope, and the contact end of the position switch spring is provided with an arc-shaped protrusion, with the contact slope and the arc-shaped protrusion corresponding to each other. The arc-shaped protrusion of the position switch spring maintains contact with the movable cover plate, and as the movable cover plate rotates, the arc-shaped protrusion moves along the contact slope. This method of contact makes the movable cover plate easy to rotate without effort and effectively reduces wear.

[0015] In a further preferred embodiment, the motor housing is also equipped with a return spring. One end of the return spring is connected to the rear side of the switch door, and the other end is connected to the movable cover plate. When no manual operation is required, the movable cover plate can automatically reset under the action of the return spring, returning to the state of covering the manual operation hole, thus preventing the electric drive mechanism from being easily de-energized due to accidental operation.

[0016] The beneficial effects of this utility model are as follows: this electric mechanism mounting box can convert a chassis vehicle from manual to electric without modifying the interior of the cabinet, and it can protect the electric mechanism and avoid operational hazards. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the electric mechanism mounting box in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the electric mechanism mounting box when the door is opened in an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the movable cover plate and locking mechanism in an embodiment of this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0021] like Figure 1-3 The diagram shows a mounting box for the electric mechanism of a medium-voltage circuit breaker, comprising a motor housing 1, an operating component 2, and an electric drive mechanism 3 capable of driving the operating component 2 to rotate. The motor housing 1 has an inner cavity, and a switch door 101 is provided on the front side of the motor housing 1. The operating component 2 and the electric drive mechanism 3 are respectively disposed in the inner cavity of the motor housing 1. A through hole 102 for the operating component 2 to extend is provided on the rear side wall of the motor housing 1. The switch door 101 is provided with a manual operation hole 1011, which corresponds to the position of the operating component 2. The motor housing 1 is also provided with a movable cover plate 103, which is movably mounted on the switch door 101 and can close or open the manual operation hole 1011. The motor housing 1 is also provided with a locking mechanism 104 that can de-energize the electric drive mechanism 3 when the movable cover plate 103 opens the manual operation hole 1011. The locking mechanism 104 is electrically connected to the electric drive mechanism 3.

[0022] When in use, the aforementioned mounting box is directly installed on the existing door panel of the switchgear. The operating component 2 can then connect to the chassis shaft through the access hole on the door panel. The electric mechanism mounting box is easy to install, requiring no modification to the switchgear interior. During use, the chassis can be remotely driven via the electric drive mechanism 3. Simultaneously, the motor box 1 protects both the operating component 2 and the electric drive mechanism 3. When manual operation is not required, the movable cover 103 covers the manual operation hole 1011, preventing manual operation of the chassis via the operating handle. When manual operation is needed, opening the movable cover 103 exposes the manual operation hole 1011, allowing the operating handle to be inserted into the operating component 2 for manual operation. Simultaneously, the locking mechanism 104 de-energizes the electric drive mechanism 3, preventing electric operation. Therefore, manual and electric operation cannot be performed simultaneously, effectively avoiding operational hazards and protecting the safety of maintenance personnel.

[0023] The electric drive mechanism 3 described above adopts the same structure as the electric operating device in CN111293622A.

[0024] One end of the movable cover plate 103 is hinged to the switch door 101, and the trigger end of the locking mechanism 104 corresponds to the position of the movable cover plate 103.

[0025] The motor housing 1 is also equipped with an unlocking knob 105, which is rotatably mounted on the switch door 101 and protrudes from the front side of the switch door 101. The unlocking knob 105 has a lock hole 1051. The unlocking knob 105 is connected to a movable cover plate 103, which is located on the rear side of the switch door 101. By rotating the movable cover plate 103 with the unlocking knob 105, the manual operation hole 1011 is covered or exposed. After the movable cover plate 103 is rotated, it can trigger the trigger end of the locking mechanism 104, causing the locking mechanism 104 to de-energize the electric drive mechanism 3. When the movable cover plate 103 is in the closed state, the unlocking knob 105 can be locked through the lock hole 1051 to prevent unauthorized operation.

[0026] The locking mechanism 104 includes a position switch 1041 and a position switch spring 1042. The position switch spring 1042 has a mounting end and a contact end. The mounting end of the position switch spring 1042 is mounted on the position switch 1041. The contact end of the position switch spring 1042 corresponds to the position of the movable cover 103, and the middle part of the position switch spring 1042 corresponds to the contact position of the position switch 1041. By using a lever to add the position switch spring 1042, it is ensured that the position switch 1041 is triggered only after the movable cover 103 has rotated significantly, thereby cutting off the power to the electric drive mechanism 3. This avoids the electric drive mechanism 3 being easily cut off due to misoperation. At the same time, the positions of the movable cover 103 and the position switch 1041 are easier to set.

[0027] The movable cover plate 103 is provided with a contact slope 1031, and the contact end of the position switch spring 1042 is provided with an arc-shaped protrusion 10421. The contact slope 1031 and the arc-shaped protrusion 10421 are positioned correspondingly. The arc-shaped protrusion 10421 of the position switch spring 1042 maintains contact with the movable cover plate 103, and as the movable cover plate 103 rotates, the arc-shaped protrusion 10421 moves along the contact slope 1031. This contact method makes the movable cover plate 103 easy to rotate without effort and effectively reduces wear.

[0028] The motor housing 1 is also equipped with a return spring 106. One end of the return spring 106 is connected to the rear side of the switch door 101, and the other end of the return spring 106 is connected to the movable cover plate 103. When no manual operation is required, the movable cover plate 103 can automatically reset under the action of the return spring 106, returning to the state of covering the manual operation hole 1011, thus preventing the electric drive mechanism 3 from being easily de-energized due to accidental operation.

Claims

1. A medium voltage circuit breaker electric mechanism installation box, comprising an operating member and an electric drive mechanism capable of driving the operating member to rotate, characterized in that: It also includes a motor box body, which is provided with an inner cavity, and a switch door is provided on the front side of the motor box body, the operating piece and the electric drive mechanism are respectively arranged in the inner cavity of the motor box body, and a through hole for the operating piece to extend out is opened on the rear side wall of the motor box body; a manual operating hole is provided on the switch door, and the manual operating hole corresponds to the position of the operating piece; a movable cover plate is also provided on the motor box body, and the movable cover plate can be movably installed on the switch door, and the movable cover plate can close or open the manual operating hole; a locking mechanism is also provided on the motor box body, which can cut off the power of the electric drive mechanism when the movable cover plate opens the manual operating hole, and the locking mechanism is electrically connected to the electric drive mechanism.

2. A medium voltage circuit breaker electric mechanism installation box according to claim 1, characterized in that: One end of the movable cover is hinged to the switch door, and the trigger end of the locking mechanism corresponds to the position of the movable cover.

3. A medium voltage circuit breaker electric mechanism installation box according to claim 2, characterized in that: The motor box body is also provided with an unlocking knob, which is rotatably mounted on the switch door and exposed on the front side of the switch door. The unlocking knob is connected to the movable cover plate, which is located on the rear side of the switch door.

4. A medium voltage circuit breaker electric mechanism installation box according to claim 2, characterized in that: The locking mechanism comprises a position switch, and the contact of the position switch corresponds to the position of the movable cover.

5. A medium voltage circuit breaker electric mechanism installation box according to claim 4, characterized in that: The locking mechanism also includes a position switch spring, which has a mounting end and a contact end. The mounting end of the position switch spring is installed on the position switch, the contact end of the position switch spring corresponds to the position of the movable cover, and the middle of the position switch spring corresponds to the contact position of the position switch.

6. A medium voltage circuit breaker electric mechanism installation box according to claim 5, characterized in that: The movable cover plate is provided with a contact slope, and the contact end of the position switch spring is provided with an arc-shaped protrusion, and the contact slope corresponds to the position of the arc-shaped protrusion.

7. A medium voltage circuit breaker electric mechanism installation box according to claim 2, characterized in that: The motor box body is also provided with a return spring, one end of which is connected to the rear side of the switch door, and the other end of which is connected to the movable cover plate.

Images