Auxiliary switch of molded case circuit breaker
Patent Information
- Application Number
- CN202522660009.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-12-16
AI Technical Summary
因此，目前装配辅助开关首先需要确保转轴处于合闸位置下进行，由于装配条件或称装配要求相对苛刻，因而影响装配效率和可靠性
Smart Images
Figure CN224745681U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to an auxiliary switch for a molded case circuit breaker. Background Technology
[0002] Molded case circuit breakers (MCCBs) are crucial control components in power transmission and distribution systems, primarily responsible for overload and short-circuit protection of power lines and equipment. To reflect the circuit breaker's on / off status, auxiliary switches are typically installed inside the circuit breaker. Generally, the output signal from the auxiliary switch is triggered by changes in the position of internal components within the circuit breaker that directly reflect the contact position, such as the rotating shaft. A circuit breaker can be equipped with one or more auxiliary switches according to the actual needs of the circuit. Auxiliary switches typically include signal output switches, push rods, and springs. When the circuit breaker is on or off, the on / off switching mechanism, such as the rotating shaft, causes a corresponding change in the state of the push rod. The push rod triggers or releases the signal output switch, causing the signal output switch to switch, thereby accurately indicating whether the circuit breaker is on or off.
[0003] When no external force is applied, the push rod of the auxiliary switch is pressed against the trigger boss of the signal output switch by one end of the push rod, i.e. the trigger end, under the action of the spring inside the auxiliary switch, such as a torsion spring. In the aforementioned position, if the operator directly installs the auxiliary switch into the accessory cavity inside the molded case circuit breaker, the other end of the push rod, which is the actuating end that cooperates with the rotating shaft, will interfere with the rotating shaft in the open position. That is, an actuating rod extending from the rotating shaft will be located in the installation path of the auxiliary switch. Therefore, the operator first needs to change the position of the push rod, for example, by pressing down on the push rod to keep one of the actuating ends of the push rod that cooperates with the rotating shaft in a state where it does not interfere with the rotating shaft, and at the same time install the auxiliary switch into the accessory cavity of the molded case circuit breaker. However, if the operator does not install the auxiliary switch in a state where the push rod does not interfere, when the rotating shaft is in the open position of the molded case circuit breaker during the installation of the auxiliary switch, the push rod will jam with the actuating rod on the rotating shaft. Even if the auxiliary switch is installed into the accessory cavity, the correct circuit breaker position status signal cannot be output by changing the position of the rotating shaft when the circuit breaker performs opening and closing operations. Therefore, the first step in assembling auxiliary switches is to ensure that the shaft is in the closed position. Since the assembly conditions or requirements are relatively stringent, this affects the assembly efficiency and reliability. Utility Model Content
[0004] The objective of this invention is to provide an auxiliary switch for a molded case circuit breaker that facilitates installation in any location, thereby improving assembly efficiency and reliability.
[0005] The present invention accomplishes its objective as follows: an auxiliary switch for a molded case circuit breaker, wherein the molded case circuit breaker includes an operating mechanism, the operating mechanism includes a rotating shaft, the auxiliary switch includes a housing, a signal output switch fixed on the housing, and a push rod rotatably mounted on the housing, wherein the rotating shaft actuates the actuating end of the push rod to rotate the push rod, and the triggering end of the push rod triggers the signal output switch to operate, characterized in that: a guide section extends from the actuating end of the push rod, and during the process of installing the auxiliary switch into the housing of the molded case circuit breaker, the guide section first contacts the rotating shaft of the operating mechanism in the open position, and as the auxiliary switch is installed, the rotating shaft slides relative to the guide section until the rotating shaft abuts against the actuating end.
[0006] Furthermore, the signal output switch has a trigger boss; the push rod is L-shaped, the bend of the L-shape forms the rotation center of the push rod, one end extending from the rotation center to the trigger boss of the signal output switch forms the trigger end of the trigger boss, and the other end extending from the rotation center of the push rod along the installation direction of the auxiliary switch forms the actuation end and the guide section in sequence.
[0007] Furthermore, the surfaces of the actuating end and the guide section facing the rotating shaft are respectively configured as a continuous actuating contact surface and a mounting guide surface. During the installation of the auxiliary switch, the rotating shaft in the off position slides relative to the mounting guide surface, and when the auxiliary switch is installed in place, the rotating shaft in the off position contacts the actuating contact surface.
[0008] Furthermore, the housing includes a base and a middle cover mounted on the base and having an auxiliary switch cavity, wherein the auxiliary switch is disposed within the auxiliary switch cavity of the middle cover, and the housing engages with the middle cover.
[0009] Furthermore, the mounting guide surface is offset away from the rotating shaft from the actuation contact surface.
[0010] Furthermore, the signal output switch is a micro switch, a limit switch, or a photoelectric switch.
[0011] The technical effect of the present invention is as follows: Since a guide section is extended on the actuating end of the push rod, when the auxiliary switch is installed into the housing, the guide section first contacts the rotating shaft of the operating mechanism in the open position. As the auxiliary switch is installed, the rotating shaft slides relative to the guide section until it abuts against the actuating end. Therefore, the auxiliary switch will not be interfered with by the rotating shaft in the open position during the installation of the auxiliary switch into the housing. This allows the molded case circuit breaker to be installed in any position, whether open or closed, thereby improving assembly efficiency and reliability. Attached Figure Description
[0012] Figure 1This is a schematic diagram of the auxiliary switch for the molded case circuit breaker of this utility model; Figure 2 for Figure 1 Detailed structural diagram of the shell shown; Figure 3 for Figure 1 A schematic diagram of the signal output switch shown; Figure 4 for Figure 1 The detailed structural diagram of the push rod shown is as follows; Figure 5 for Figure 1 A detailed structural diagram of the middle cover of the outer casing is shown; Figure 6 for Figure 1 The diagram shows the arrangement of the shaft, push rod, and signal output switch 2 during the installation of the auxiliary switch, with the shaft in the open position. Figure 7 for Figure 1 The diagram shows the arrangement of the shaft, push rod, and signal output switch 2 after the auxiliary switch is installed in the open position. Figure 8 for Figure 1 The diagram shows the arrangement of the shaft, push rod, and signal output switch when the shaft is in the closed position.
[0013] In the diagram: 1. Housing; 11. Mounting boss; 12. Shaft platform; 2. Signal output switch; 21. Trigger boss; 3. Push rod; 31. Actuating end; 311. Actuating contact surface; 32. Trigger end; 33. Guide section; 331. Mounting guide surface; 34. Torsion spring; 4. Rotating shaft; 41. Actuating rod; 5. Housing; 51. Base; 52. Middle cover; 521. Auxiliary switch cavity; 20. Mounting hole; 30. Shaft hole. Detailed Implementation
[0014] Please see Figures 1 to 8 The diagram illustrates the operating mechanism of a molded case circuit breaker, which includes a rotating shaft 4. The diagram also shows the housing 1 of an auxiliary switch, a signal output switch 2 mounted on the housing 1, and a push rod 3 rotatably mounted on the housing 1. The rotating shaft 4 actuates the actuating end 31 of the push rod 3 to rotate the push rod 3, and the triggering end 32 of the push rod 3 triggers the signal output switch 2 to operate.
[0015] The key technical point of the technical solution provided by this utility model is that a guide section 33 is extended on the actuating end 31 of the aforementioned push rod 3. When the aforementioned auxiliary switch is installed into the housing 5 of the molded case circuit breaker, the aforementioned guide section 33 first contacts the rotating shaft 4 of the operating mechanism when it is in the disconnected position. As the auxiliary switch is installed, the rotating shaft 4 slides relative to the guide section 33 until the rotating shaft 4 abuts against the actuating end 31.
[0016] Based on professional knowledge, the aforementioned auxiliary switch is used to cooperate with the rotating shaft 4 of the operating mechanism of the molded case circuit breaker's structural system. The rotating shaft 4 is equipped with the moving contact of the contact system, which is also a molded case circuit breaker's structural system. When the rotating shaft 4 rotates, it drives the moving contact to rotate, thereby causing the moving contact to close or open with the stationary contact of the contact system (commonly referred to in the industry as "closing and opening").
[0017] Depend on Figure 2 As shown, a pair of mounting bosses 11 and a shaft platform 12 protrude from the housing 1, which are formed by... Figure 3 The pair of mounting holes 20 on the aforementioned signal output switch 2 cooperate with the mounting bosses 11, that is, the pair of mounting bosses 11 extend into the pair of mounting holes 20.
[0018] Depend on Figure 2 as well as Figures 6 to 8 As shown, the aforementioned signal output switch 2 has a trigger boss 21; the aforementioned push rod 3 is L-shaped, the bend of the L-shape constitutes the rotation center of the push rod 3, one end extending from the rotation center to the trigger boss 21 of the aforementioned signal output switch 2 constitutes the trigger end 32 of the aforementioned trigger boss 21, and the other end extending from the rotation center of the push rod 3 along the installation direction of the auxiliary switch constitutes the actuation end 31 and the guide section 33 in sequence.
[0019] Depend on Figure 4 As shown, a shaft hole 30 is provided at the rotation center of the aforementioned push rod 3. This shaft hole 30 cooperates with the aforementioned shaft base 12. After the signal output switch 2 and the push rod 3 are both installed on the housing 1, a cover plate (not shown in the figure, belonging to the scope of prior art) engages with the housing 1, thereby encapsulating the signal output switch 2 and the push rod 3 within the housing 1 to form a modular auxiliary switch. Of course, the aforementioned cover plate may not be provided; instead, the signal output switch 2 and the push rod 3 may be encapsulated using the middle cover 52 or the side wall of the base 51 of the housing 5 structure system, which will be mentioned below.
[0020] Depend on Figures 6 to 8As shown, the surfaces of the aforementioned actuating end 31 and guide section 33 facing the aforementioned rotating shaft 4 are respectively configured as a continuous actuating contact surface 311 and a mounting guide surface 331. During the installation of the aforementioned auxiliary switch, the rotating shaft 4 in the open position slides relative to the mounting guide surface 331. When the auxiliary switch is installed in place, the rotating shaft 4 in the open position contacts the actuating contact surface 311. The aforementioned mounting guide surface 331 is offset away from the rotating shaft 4 based on the actuating contact surface 311, and it plays a guiding role in the relative position of the rotating shaft 4 and the push rod 3 during the installation of the auxiliary switch.
[0021] Based on the above explanation and in combination Figure 4 as well as Figures 6 to 8 It can be seen that the trigger end 32 extends from the rotation center of the L-shaped push rod 3 towards the trigger boss 21 of the signal output switch 2, that is, the trigger end 32 is formed on one arm of the L-shape, while the actuation end 31 and the guide section 33 are formed on the other arm. The other arm is arranged approximately along the installation direction of the auxiliary switch, that is, the height direction of the molded case circuit breaker, as detailed in [reference needed]. Figure 1 The height direction of the molded case circuit breaker. Furthermore, one of the aforementioned arms extends in a generally horizontal direction, as can also be seen in... Figure 1 The length direction of the molded case circuit breaker is shown, while the width direction can be found in [reference needed]. Figure 1 The orientation is perpendicular to the paper. One arm of the aforementioned L-shape is located above the signal output switch 2, while the other arm is located to one side of the signal output switch 2, extending downwards to engage with the rotating shaft 4. A torsion spring 34 is also provided on the push rod 3. Figure 1 As shown in the diagram, torsion spring 34 is sleeved on the rotation center axis of the push rod. Since one end of torsion spring 34 abuts against one arm of the push rod 3 that forms the trigger end 32, and the other end abuts against the housing 1, the trigger end 32 of the push rod 3 can maintain a triggering tendency with the trigger boss 21 of the signal output switch 2. The push rod 3 can overcome the torsion force of torsion spring 34 to rotate around the axis to release and press the trigger boss 21 of the signal output switch 2, which is a button.
[0022] See you later Figure 1 And combined Figure 5 The aforementioned housing 5 includes the base 51 mentioned above and a middle cover 52 that is fitted on the base 51 and has an auxiliary switch cavity 521. The aforementioned auxiliary switch is disposed in the auxiliary switch cavity 521 of the aforementioned middle cover 52, and the aforementioned housing 1 is engaged with the middle cover 52.
[0023] The cavity formed between the base 51 and the middle cover 52 that is placed above the base 51 and fixed is used to house the contact system, arc extinguishing system, operating mechanism, tripping mechanism and wiring terminals of the molded case circuit breaker.
[0024] In this embodiment, the aforementioned signal output switch 2 is preferably a micro switch, but it is not absolutely limited to a micro switch. For example, a limit switch or photoelectric switch or other signal device equivalent to a micro switch can be used.
[0025] See the key points Figures 6 to 8 During the installation of the auxiliary switch, the auxiliary switch is installed from top to bottom along the height direction of the molded case circuit breaker. When the molded case circuit breaker is in the open position, the actuating rod 41 on the rotating shaft 4 first contacts the end of the guide section 33, such as... Figure 6 As the auxiliary switch is installed downwards, the actuator rod 41 slides relative to the installation guide surface 331, causing the push rod 3 to rotate counterclockwise by a certain angle. Once the auxiliary switch is in place, the rotating shaft 4 contacts the actuation contact surface 311, completing the assembly of the auxiliary switch. At this time, the molded case circuit breaker is in the open position, the actuator rod 41 on the rotating shaft 4 contacts the actuation contact surface 311, and the trigger end 32 remains in the released state with the trigger boss 21 of the signal output switch 2. Figure 7 When the molded case circuit breaker is closed, the actuator rod 41 on the rotating shaft 4 releases the actuator contact surface 311, the push rod rotates clockwise, the trigger end 32 triggers the trigger boss 21 of the signal output switch 2, and the signal output switch 2 outputs a signal.
[0026] In summary, by setting the push rod contact surface in two sections, this utility model allows the auxiliary switch to be installed in any position of the circuit breaker, whether the circuit breaker is in the closed position (i.e., the closed position of the rotating shaft 4) or the push rod 3 is kept pressed to avoid interference with the rotating shaft 4. This improves assembly efficiency and avoids jamming of the push rod and rotating shaft, thereby improving the reliability of the auxiliary switch signal output.
Claims
1. An auxiliary switch for a molded case circuit breaker, the molded case circuit breaker comprising an operating mechanism, the operating mechanism comprising a rotating shaft (4), the auxiliary switch comprising a housing (1), a signal output switch (2) fixed on the housing (1), and a push rod (3) rotatably disposed on the housing (1), wherein the rotating shaft (4) actuates the actuating end (31) of the push rod (3) to rotate the push rod (3), and the triggering end (32) of the push rod (3) triggers the signal output switch (2) to operate, characterized in that: A guide section (33) is provided on the actuating end (31) of the push rod (3). When the auxiliary switch is installed into the housing (5) of the molded case circuit breaker, the guide section (33) first contacts the rotating shaft (4) of the operating mechanism in the open position. As the auxiliary switch is installed, the rotating shaft (4) slides relative to the guide section (33) until the rotating shaft (4) abuts against the actuating end (31).
2. The auxiliary switch for a molded case circuit breaker according to claim 1, characterized in that: The signal output switch (2) has a trigger boss (21); the push rod (3) is L-shaped, the bend of the L-shape forms the rotation center of the push rod (3), one end extending from the rotation center to the trigger boss (21) of the signal output switch (2) forms the trigger end (32) of the trigger boss (21), and the other end extending from the rotation center of the push rod (3) along the installation direction of the auxiliary switch forms the actuation end (31) and the guide section (33) in sequence.
3. An auxiliary switch for a molded case circuit breaker according to claim 2, characterized in that: The surfaces of the actuating end (31) and the guide section (33) facing the rotating shaft (4) are respectively configured as a continuous actuating contact surface (311) and a mounting guide surface (331). During the installation of the auxiliary switch, the rotating shaft (4) in the off position slides relative to the mounting guide surface (331), and when the auxiliary switch is installed in place, the rotating shaft (4) in the off position contacts the actuating contact surface (311).
4. An auxiliary switch for a molded case circuit breaker according to claim 1, characterized in that: The outer casing (5) includes a base (51) and a middle cover (52) fitted on the base (51) and having an auxiliary switch cavity (521). The auxiliary switch is disposed in the auxiliary switch cavity (521) of the middle cover (52), and the housing (1) engages with the middle cover (52).
5. An auxiliary switch for a molded case circuit breaker according to claim 3, characterized in that: The mounting guide surface (331) is offset away from the rotating shaft (4) based on the actuation contact surface (311).
6. An auxiliary switch for a molded case circuit breaker according to claim 1 or 2, characterized in that: The signal output switch (2) is a micro switch, limit switch or photoelectric switch.