A closing limiting structure of a switch device

Abstract

The application discloses a closing limiting structure of a switch electric appliance, which comprises a shell and an operating mechanism in the shell; the operating mechanism comprises a rack, a jump buckle, a lock buckle, a re-buckle and a buckle resetting piece; the jump buckle and the lock buckle are rotationally arranged on the rack; when the operating mechanism is in a closing energy storage state, the jump buckle is locked with the lock buckle, and the jump buckle, the lock buckle and the re-buckle form a steady state; wherein, the limiting device is detachably arranged on the shell, or rotationally arranged on the shell, or movably arranged on the shell; the limiting device has a first position for limiting the rotation of the re-buckle to limit the rotation of the re-buckle; after being driven by external force, the limiting device is separated from the first position to release the limitation on the re-buckle. The closing limiting structure of the switch electric appliance can realize the closing transportation of the product.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, specifically to the operating mechanism of switchgear, and more particularly to a closing limit structure for switchgear. Background Technology

[0002] Existing molded case circuit breakers and some high-performance disconnectors all employ the following operating mechanism, such as the tripping device of a circuit breaker operating mechanism disclosed in CN1901125A. This device includes a traction rod, a first latch (commonly referred to as a re-latch in the art), a second latch (commonly referred to as a latch in the art), and a trip latch (commonly referred to as a trip latch in the art). The first latch is essentially fixed to the traction rod and moves with it. When the circuit breaker is in the closed state, the first latch abuts against the back of the second latch to restrict its movement, and the second latch and the trip latch remain engaged. The forces among the three are balanced, and the entire operating mechanism remains stably in the closed state. When an abnormality occurs in the line, the traction rod is driven to rotate by an external force, such as being driven to rotate by a thermomagnetic trip unit. This causes the holding force of the first latch against the second latch to disappear. At this time, the balance of forces among the three is broken, and the entire operating mechanism, under the action of its main torsion spring, trips the circuit breaker.

[0003] The existing switch structure described above is currently insufficient to meet certain specific customer needs. For example, customers may require the product to be delivered to them in a closed state until installation. In this case, the traction rod is easily subjected to external forces and rotates when the circuit is closed (bumps and vibrations during transport can cause the traction rod to rotate). This rotation of the traction rod disrupts the force balance between the first latch, the second latch, and the trip latch, causing the circuit breaker to trip and often resulting in inconvenience for customers.

[0004] Therefore, how to develop a switch structure that can meet customer needs has become an urgent problem to be solved in this field. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to overcome the shortcomings of the prior art and to provide a closing limit structure for a switching device that can achieve the effect of transporting the product in the closed state.

[0006] This invention provides a closing limit structure for a switchgear, comprising: a housing and an operating mechanism located within the housing; the operating mechanism includes a frame, a trip latch, a locking latch, a re-latch, and a fastener reset component; the trip latch and the locking latch are rotatably configured with respect to the frame; the re-latch is rotatably configured with respect to the frame or the housing; when the operating mechanism is in a closed energy storage state, the trip latch and the locking latch are locked, and the re-latch abuts against or engages with the locking latch to achieve a stable state for the trip latch, the locking latch, and the re-latch. It also includes a limiting device, which is detachably, rotatably, or movablely connected to the housing. The limiting device has a first position for limiting the rotation of the re-clamp, thereby limiting the rotation of the re-clamp, so that the tripping latch, locking latch, and re-clamp are stably in a steady state under the closed state. When the limiting device is driven by an external force, it disengages from the first position to release the restriction on the re-clamp.

[0007] The limiting device is provided with a first retaining structure between itself and the housing. The first retaining structure is a mechanical connection structure whose connection state changes after being subjected to external force. When no external force is applied, the limiting device is kept in the first position by the first retaining structure.

[0008] It also includes a reset component. When the limiting device is in the first position, the reset component is in an energy storage state and is used to provide a reset force to the limiting device to move away from the first position after the first holding structure is released. The reset force is less than the holding force provided by the first holding structure.

[0009] The first retaining structure is a threaded structure, and the housing has a threaded hole. The limiting device includes a limiting part that forms a threaded engagement with the threaded hole and a driving part for direct or indirect operation. The limiting part is used to restrict the re-clamping from rotating.

[0010] The housing has a cavity formed to accommodate the limiting device, and a threaded hole is located at the bottom of the cavity.

[0011] The housing includes a top cover, a base, and a cavity support, wherein the cavity is disposed on the cavity support; the top cover has an operating hole communicating with the cavity, and the limiting device is placed inside the cavity after being completely disengaged from the first position; the cavity support and the top cover are integral parts, or the cavity support and the base are integral parts, or the cavity support and the top cover are connected by fasteners, or the cavity support and the base are connected by fasteners.

[0012] The limiting device is rotatably or movablely disposed with the housing. The limiting device also includes a second position, which is the position after the limiting device is disengaged from the first position. A second retaining structure is provided between the limiting device and the housing. Both the first retaining structure and the second retaining structure are interference fit structures or snap-fit ​​structures, so as to keep the limiting device in the second position when no external force is applied.

[0013] The limiting device and the housing are provided with a first slot and a second slot, and the other is provided with a protrusion. When the protrusion is in the first slot, it forms the first retaining structure, and when the protrusion is in the second slot, it forms the second retaining structure. The protrusion can switch back and forth between the first slot and the second slot by rotating or moving the limiting device.

[0014] The device and the housing are provided with a first slot and a second slot, respectively, and the other is provided with a spring foot with a protrusion. When the protrusion is in the first slot, it forms the first retaining structure, and when the protrusion is in the second slot, it forms the second retaining structure. The protrusion can switch back and forth between the first slot and the second slot by moving the limiting device.

[0015] The first slot and the second slot are connected by a transition surface, and the transition surface has a raised position. When the protrusion switches back and forth between the first slot and the second slot, it always abuts against the transition surface. The spring foot deformation is the largest when the protrusion abuts against the raised position.

[0016] The first retaining structure is a tearable low-strength connection structure, and a discontinuous break is provided between the limiting device and the housing to form the tearable low-strength connection structure; the housing is provided with a mating hole, and one end of the limiting device is a limiting part that passes through the mating hole into the housing to limit the rotation of the re-fastening.

[0017] The first retaining structure is an interference fit structure, and the housing has a mating hole. The limiting device passes through the mating hole to form an interference fit. The limiting device includes a limiting part located inside the housing, which is used to limit the rotation of the re-clamp.

[0018] It also includes a traction rod, which is rotatably mounted to the frame. The re-clamp is fixed to the traction rod or the re-clamp and the traction rod are an integral part. When the first position is reached, the limiting device is located within the rotation trajectory of the lock or the traction rod to limit the rotation of the re-clamp.

[0019] The operating mechanism further includes an upper connecting rod, a main tension spring, a hinge shaft, and a lever rotatably connected to the frame; one end of the upper connecting rod is rotatably connected to the jump buckle, and the other end is connected to the hinge shaft; the two ends of the main tension spring are respectively connected to the lever and the hinge shaft, and the main tension spring is in a deformed state when the operating mechanism is in the closed state.

[0020] An operating handle is fixed to the lever.

[0021] The housing is equipped with an operating knob, which is driven by a gear transmission structure or a linkage transmission structure.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: A closing limit structure for a switchgear includes: a housing and an operating mechanism located within the housing; the operating mechanism includes a frame, a trip latch, a locking latch, a re-latch, and a fastener reset component; the trip latch and the locking latch are rotatably configured with respect to the frame; the re-latch is rotatably configured with respect to the frame or the housing; when the operating mechanism is in a closed energy storage state, the trip latch and the locking latch are locked, and the re-latch abuts or engages with the locking latch to make the trip latch, the locking latch, and the re-latch form a stable state; wherein, a limiting device is also included, which is detachably configured with respect to the housing, or rotatably configured with respect to the housing, or movable configured with respect to the housing; the limiting device has a first position for limiting the rotation of the re-latch to restrict the rotation of the re-latch, thereby making the trip latch, the locking latch, and the re-latch stably in a stable state; the limiting device is disengaged from the first position after being driven by an external force to release the restriction on the re-latch.

[0023] The device employs a limit switch to prevent rotation of the latch when the switch is closed. Even during transport, bumps and vibrations will not disrupt the stable state of the trip, lock, and re-clamp, ensuring the switch remains stably closed. After delivery to the customer, the limit switch can be detached, rotated, or moved to disengage it from its first position, allowing the switch to open normally. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the rotary disconnector switch according to Embodiment 1 of the present invention is shown; Figure 2 A cross-sectional view of the operating mechanism of Embodiment 1 of the present invention is shown; Figure 3 A schematic diagram of the operating mechanism structure of Embodiment 1 of the present invention is shown; Figure 4 A schematic diagram showing the linkage between the operation knob and the operation mechanism in Embodiment 1 of the present invention is shown; Figure 5 A diagram showing the relationship between the operating mechanism and the limiting device in Embodiment 1 of the present invention is provided. Figure 6 A schematic diagram of the limiting device according to Embodiment 1 of the present invention is shown; Figure 7A schematic diagram of the molded case circuit breaker according to Embodiment 2 of the present invention is shown; Figure 8 A schematic diagram of the limiting device according to Embodiment 3 of the present invention is shown; Figure 9 A schematic diagram of the limiting device according to Embodiment 4 of the present invention is shown; Figure 10 A schematic diagram of the limiting device according to Embodiment 5 of the present invention is shown; Figure 11 A schematic diagram of the limiting device according to Embodiment 6 of the present invention is shown; Figure 12 A schematic diagram of the limiting device according to Embodiment 7 of the present invention is shown; Figure 13 A diagram showing the relationship between the limiting device, the first holding structure, and the second holding structure in Embodiment 7 of the present invention is shown. Figure 14 A modified embodiment of the present invention 7 is shown; Figure 15 Another variation of embodiment 7 of the present invention is shown; Figure 16 This diagram illustrates the state of the limiting device in the first position according to Embodiment 8 of the present invention. Figure 17 This diagram illustrates the state of the limiting device in the second position according to Embodiment 8 of the present invention. Figure 18 A diagram showing the relationship between the limiting device, the first holding structure, and the second holding structure in Embodiment 8 of the present invention is provided. Detailed Implementation

[0026] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] A closing limit structure for a switchgear includes: a housing and an operating mechanism located within the housing; the operating mechanism includes a frame, a trip latch, a locking latch, a re-latch, and a fastener reset component; the trip latch and the locking latch are rotatably mounted to the frame; the re-latch is rotatably mounted to the frame or the housing; when the operating mechanism is in a closed energy storage state, the trip latch and the locking latch are locked, and the re-latch abuts or engages with the locking latch to achieve a stable state for the trip latch, the locking latch, and the re-latch; the structure also includes a limiting device, which is detachably mounted to the housing, rotatably mounted to the housing, or movable mounted to the housing; the limiting device has a first position for limiting the rotation of the re-latch to restrict its rotation, thereby ensuring that the trip latch, the locking latch, and the re-latch are stably in a stable state; the limiting device disengages from the first position when driven by an external force to release the restriction on the re-latch.

[0032] The device employs a limit switch to prevent rotation of the latch when the switch is closed. Even during transport, bumps and vibrations will not disrupt the stable state of the trip, lock, and re-clamp, ensuring the switch remains stably closed. After delivery to the customer, the limit switch can be detached, rotated, or moved to disengage it from its first position, allowing the switch to open normally.

[0033] To ensure the limiting device remains relatively stable in its first position, a first retaining structure can be provided between the limiting device and the housing. This first retaining structure is a mechanical connection structure whose connection state can be changed under external force. When no external force is applied, the limiting device is held in the first position by this first retaining structure. The mechanical connection method here can be an interference fit, a snap-fit, a threaded connection, a tearable low-strength connection, etc.—any mechanical structure that can change its position under external force is acceptable.

[0034] The following are examples of implementation methods for several mechanical connection methods:

[0035] Implementation Method 1

[0036] The first retaining structure is a threaded structure, and the housing has a threaded hole. The limiting device includes a limiting part that forms a threaded engagement with the threaded hole and a driving part for direct or indirect operation; the limiting part is used to limit the rotation of the re-clamp.

[0037] This structural design is relatively simple, and the limit device is easy to install and remove; it only requires a tool to tighten it.

[0038] The threaded structure can be further modified, for example, by forming a cavity on the housing to accommodate a limiting device, with the threaded hole located at the bottom of the cavity.

[0039] This design makes it difficult for the limiting device to detach directly from the housing, and it is also relatively convenient to install, as the limiting device can be directly placed into the cavity for installation.

[0040] This threaded structure can be further modified. For example, the housing includes a top cover, a base, and a cavity support, with the cavity disposed on the cavity support. The top cover has an operating hole communicating with the cavity, and the limiting device is placed inside the cavity after being completely disengaged from the first position. The cavity support and the top cover are integral parts, or the cavity support and the base are integral parts, or the cavity support and the top cover are connected by fasteners, or the cavity support and the base are connected by fasteners.

[0041] With this structure, users only need to insert the tool into the operating hole to operate, which ensures that the limiting device is always in the receiving cavity. This avoids the obvious through hole in the housing after the limiting device of the aforementioned threaded structure is removed, which would cause the salt spray test to fail or be unsightly.

[0042] Implementation Method 2

[0043] The first retaining structure is a tearable low-strength connection structure. A discontinuous break is provided between the limiting device and the housing to form the tearable low-strength connection structure. The housing has a mating hole, and one end of the limiting device is a limiting part that passes through the mating hole into the housing to limit the rotation of the re-fastening.

[0044] This implementation method is an irreversible way to disassemble and assemble the limiting device, and it is also a relatively simple implementation method. After receiving the switch, the user can directly break the low-strength connection structure to remove the limiting device, which is very convenient to operate.

[0045] Implementation Method 3

[0046] The first retaining structure is an interference fit structure. The housing has a mating hole, and the limiting device passes into the mating hole to form an interference fit. The limiting device includes a limiting part located inside the housing, which is used to limit the rotation of the re-clamp.

[0047] In this implementation method, the installation and removal of the limiting device are both convenient. After receiving the switch, the user can pull out the limiting device to remove it; similarly, the limiting device can also be installed in the opposite direction.

[0048] Implementation Method 4

[0049] In this embodiment, the limiting device is rotatably or movablely disposed with the housing. In this embodiment, the limiting device also includes a second position, which is the position after the limiting device is disengaged from the first position. A second retaining structure is provided between the limiting device and the housing. Both the first and second retaining structures are interference fit structures or snap-fit ​​structures, so as to keep the limiting device in the second position when no external force is applied.

[0050] The advantage of this implementation is that the limiting device does not completely detach from the housing. Instead, the limiting device disengages from the first position by rotating or moving within the housing, making it extremely convenient for the user. Furthermore, the limiting device remains relatively stable in both the first and second positions because an interference fit or snap-fit ​​structure can be used to maintain the limiting device in either position.

[0051] The snap-fit ​​structure in this implementation can be further configured as follows. Both the limiting device and the housing have a first slot and a second slot on one side, and a protrusion on the other. When the protrusion is in the first slot, it forms the first retaining structure; when it is in the second slot, it forms the second retaining structure. The protrusion switches between the first and second slots by rotating or moving the limiting device. This allows for two options: First, the first and second slots are located on the limiting device, while the protrusion is located on the housing. When the limiting device moves or rotates, the first and second slots move and engage with the protrusion to achieve a locking mechanism. Second, the first and second slots are located on the housing, while the protrusion is located on the limiting device. When the limiting device moves or rotates, the protrusion moves and engages with the first and second slots to achieve a locking mechanism. This locking structure is easier to operate and less complex to design.

[0052] The above-mentioned snap-fit ​​structure can also be modified as follows: One of the limiting device and the housing has a first slot and a second slot, and the other has a spring foot with a protrusion. When the protrusion is in the first slot, it forms the first retaining structure, and when the protrusion is in the second slot, it forms the second retaining structure. The protrusion can switch back and forth between the first slot and the second slot by rotating or moving the limiting device.

[0053] This spring-loaded design allows the protrusion to deform as it switches between the first and second slots, facilitating its rapid entry into a slot when it reaches it. Simultaneously, the spring-loaded design also reduces the rigid impact force between the housing and the limiting device when the protrusion leaves a slot (for example, the previous type of protrusion-slot engagement relied on rigid impact force, where the protrusion is forced into the slot during the movement of the limiting device).

[0054] The above-mentioned snap-fit ​​structure can also be modified as follows: The first slot and the second slot are connected by a transition surface, and the transition surface has a raised position; the protrusion always abuts against the transition surface when switching back and forth between the first slot and the second slot, and the spring foot deformation is maximized when the protrusion abuts against the raised position.

[0055] This transition surface and the spring foot's matching structure can prevent the spring foot from regressing when it crosses the raised position, and can even accelerate the movement of the limiting device to a certain extent.

[0056] In addition to the above-described structure, to improve the efficiency of the limiting device disengaging from the first position, all the above embodiments may further include a reset member. When the limiting device is in the first position, the reset member is in an energy-storing state, and after the first holding structure is released, it is used to provide a reset force to the limiting device to move in the direction of disengagement from the first position; this reset force is less than the holding force provided by the first holding structure. Many types of reset members can be selected here, such as compression springs, tension springs, torsion springs, leaf springs, etc., as long as they can provide a reset force.

[0057] In addition to the above structure, in order to improve the ease of installation of the re-clamp, all the above embodiments may also include a traction rod, which is rotatably arranged with the frame, and the re-clamp is fixed on the traction rod or the re-clamp and the traction rod are an integral part; the limiting device, when in the first position, is located within the rotation trajectory of the re-clamp or the traction rod to limit the rotation of the re-clamp.

[0058] In addition to the above-described structure, the operating mechanism of all the above embodiments also includes an upper connecting rod, a main tension spring, a hinge shaft, and a lever rotatably connected to the frame; one end of the upper connecting rod is rotatably connected to the trip latch, and the other end is connected to the hinge shaft; both ends of the main tension spring are connected to the lever and the hinge shaft respectively, and the main tension spring is in a deformed state when the operating mechanism is in the closed state. This mechanism is also a conventional mechanism for plastic housing mechanisms. The movement of the lever causes the main tension spring to deform. When the switch is in the closed state, the main tension spring is deformed. At this time, if the trip latch, the locking latch, and the re-latch are in a steady state, the operating mechanism will stably remain in the closed state. Once the re-latch rotates, causing the steady state of the trip latch, the locking latch, and the re-latch to be broken, the operating mechanism will quickly switch to the open state under the action of the main tension spring.

[0059] All of the above embodiments can be applied to molded case circuit breakers. When applied to molded case circuit breakers, an operating handle is fixed on the lever, and the operating handle extends from the housing for easy operation.

[0060] All of the above embodiments can be applied to rotary disconnect switches. When applied to rotary disconnect switches, an operating knob is provided on the housing. The operating knob is connected to a lever through a gear transmission structure or a linkage transmission structure so that the operating knob drives the lever to rotate.

[0061] The following describes the contents involved in the above embodiments with reference to several specific examples. Example 1

[0062] like Figures 1-6 As shown, embodiments of the present invention provide a closing limit structure for a switching device, specifically a closing limit structure for a rotary disconnector, comprising: The housing 2 includes a top cover 2a, a base 2b, and a cavity support 2c. The top cover 2a and the base 2b are fastened together by bolts, or alternatively by snap-fit. The cavity support 2c is also fastened to the top cover 2a by bolts. The cavity support 2c can be integral with the top cover 2a, integral with the base 2b, or bolted to the base 2b. A cavity R1 is formed in the cavity support 2c, with its opening facing the top cover 2a. An operating hole CZ1 on the top cover 2a communicates with the cavity R1.

[0063] An operating knob 22 is provided on the upper surface of the housing 2, and a gear transmission structure is provided inside the housing 2. This gear transmission structure includes an input gear 32, an output gear 33, and a swing member 34. The input gear 32 and the output gear 33 are rotatably mounted relative to the housing 2 and mesh with each other. The input gear 32 is fixed to the rotating shaft 31 of the operating knob 22, and the eccentric position of the output gear 33 is fixed to the first end of the fixed swing member 33. This fixing can be achieved by bolting or riveting. The second end of the swing member 34 always abuts against the lever 17. This abutment can also be replaced by fixing, such as bolting or riveting. With this structure, the operating knob 22 can be converted into the rotation of the lever 17.

[0064] The aforementioned gear transmission structure can also employ some existing technologies, such as the main body in patent CN114093732A. The aforementioned gear transmission structure can also be replaced by a linkage transmission structure, which is existing technology, such as the centrally located mechanism in patent CN216902575U.

[0065] An operating mechanism 1 is provided inside the housing 2. The operating mechanism 1 includes a frame 11, a jump buckle 12, a locking buckle 13, a re-locking buckle 14, a fastener reset component 15, a traction rod 16 (in this embodiment, the traction rod 16 and the re-locking buckle 14 are separate parts, but they can also be integrated), a lever 17, an upper connecting rod 18, a main tension spring 19, and a hinge shaft 20. The frame 11 is fixed inside the base 2b, and this fixing can be achieved by bolts or snap-fit. The jump buckle 12, locking buckle 13, re-locking buckle 14, traction rod 16, and lever 17 are all rotatably connected to the frame 11; one end of the upper connecting rod 18 is rotatably connected to the jump buckle 12, and the other end is connected to the hinge shaft 20; both ends of the main tension spring 19 are connected to the lever 17 and the hinge shaft 20, respectively. The specific connection methods of these components are common knowledge in the art and will not be described in detail here. Through the connection of these components, when the switch is in the closed position, the main tension spring 19 is in a stretched deformation state, the trip latch 12 and the locking latch 13 are locked, and the re-latch 14 abuts against the locking latch 13 to make the trip latch 12, the locking latch 13, and the re-latch 14 form a stable state. The stable state of the three can keep the operating mechanism stably in the closed state. When the stable state of the three is broken (for example, the re-latch 14 deflects), the operating mechanism 1 can quickly switch to the open state under the action of the main tension spring 19. The fastener reset component 15 is a torsion spring, with one end abutting against the locking latch 13 and the other end against the re-latch 14, used to reset the locking latch 13 and the re-latch 14.

[0066] Therefore, the steady state of the three mechanisms mentioned above is disrupted during the closing and transportation process, necessitating the addition of a limiting device to limit the re-clamp 14. In this embodiment, the limiting device is a bolt, which is located within the accommodating cavity R1 when not in a limiting position. One end of the bolt is the limiting part G1, and the other end is the driving part Q1, which can be driven by tools such as a blank. A threaded hole LW1 is provided at the bottom of the accommodating cavity R1. The bolt, through its threaded engagement with the threaded hole LW1, allows the limiting part G1 to extend into one side of the traction rod 16 (or, in a scheme where the traction rod 16 and the re-clamp are integrated, the limiting part G1 extends into one side of the re-clamp 14), effectively preventing the re-clamp 14 from rotating (i.e., the first position), thus limiting and preventing the re-clamp 14 from rotating. When the customer wants to cancel the limiting of the re-clamp 14, the driving part Q1 can be operated by inserting a tool such as a blank into the operating hole CZ1. Here, the first retaining structure formed by the threaded structure is very convenient to operate, and the bolt can stably maintain the first position.

[0067] In this embodiment, to facilitate user operation, a reset element FW1 is provided within the receiving cavity R1. This reset element FW1 is a spring, which is sleeved on the bolt and rests between the receiving cavity R1 and the driving part Q1. When the bolt is rotated clockwise into the threaded hole LW1, the spring can compress and store energy. When the bolt rotates counterclockwise, the threads on the bolt disengage from the threaded hole LW1, and the spring can accelerate the bolt's retraction. Because the bolt engages with the threaded hole LW1, the reset force of the reset element FW1 does not affect the bolt's stable position in the first position (i.e., the holding force of the first retaining structure on the limiting device is greater than the reset force of the reset element FW1). Example 2

[0068] like Figure 7 As shown, the switch in Embodiment 2 is a molded case circuit breaker. The difference from Embodiment 1 is that it does not have the features of an operating knob, gear transmission structure, or linkage structure. Instead, an operating handle 21 is fixed on the lever 17, and the operating handle 21 extends out of the housing 2 for operation. Example 3

[0069] like Figure 8 As shown, the difference between Embodiment 3 and Embodiment 1 is that there is no cavity support. In Embodiment 2, the limiting device is still a bolt, and a threaded hole LW1 is directly opened on the upper cover 2a. The limiting device directly cooperates with the threaded hole LW1, and the user can simply unscrew the limiting device when disassembling it. Example 4

[0070] like Figure 9 As shown, the difference between Embodiment 4 and Embodiment 3 is that a receiving cavity R1 is formed on the upper cover 2a, and the threaded hole LW1 is located at the bottom of the receiving cavity R1. During disassembly and assembly, the limiting device can be located inside the receiving cavity R1 for disassembly and assembly. Example 5

[0071] like Figure 10 As shown, the difference between Embodiment 5 and Embodiment 3 is that the limiting device and the upper cover 2a are not threaded together, but rather an interference fit. Specifically, the limiting device is a column-like structure that inserts into the mating hole PH1 on the upper cover 2a to form an interference fit. The limiting part G1 of the limiting device is used to restrict the rotation of the traction rod 16 (in a scheme where the re-fastener is integrated with the traction rod 16, it can be located on the re-fastener side). At this time, the first retaining structure is an interference fit structure, thereby ensuring that the limiting device is stably in the first position. When the user needs to release the restriction on the traction rod 16, the limiting device can be pulled out from outside the upper cover 2a. Example 6

[0072] like Figure 11As shown, the difference between Embodiment 6 and Embodiment 3 is that the limiting device and the upper cover 2a are not threaded together, but rather use a tearable low-strength connection structure. Specifically, a part of the limiting device is inserted into the mating hole PH1 on the upper cover 2a, located next to the traction rod 16 (in a re-fastening scheme integrated with the traction rod 16, it is equivalent to being located next to the re-fastening). The limiting device and the surface of the upper cover 2a are connected by a discontinuous break (i.e., a tearable low-strength connection structure). At this time, the first retaining structure is the tearable low-strength connection structure S1, thereby ensuring that the limiting device is stably in the first position. When the user needs to release the restriction on the traction rod 16, the discontinuous break can be broken, and the limiting device can be pulled out from outside the upper cover 2a. Example 7

[0073] like Figure 12-13 As shown, the difference between Embodiment 7 and Embodiment 3 is that the limiting device and the upper cover 2a are not threaded together, but are movable, specifically, they can slide relative to the upper cover 2a. The limiting device has a limiting part G1 located inside the housing 2, and a driving part Q1 (which can be a handle, grip, etc.) that can be operated from outside the housing 2. The driving part Q1 does not necessarily have to protrude from the housing 2; it can also be completely inside the housing 2, as long as the housing 2 has a corresponding operating hole. In this embodiment, the limiting device can slide to the first position (the position where the limiting part G1 restricts the movement of the traction rod 16) under the action of external force, and it can also slide to the second position (the position where the limiting part G1 no longer restricts the movement of the traction rod 16) under the action of external force. In the first and second positions, the limiting device is held by a first retaining structure and a second retaining structure, respectively. Specifically, the first and second retaining structures are as follows: a first slot C1 and a second slot C2 are provided on the housing 2, and a protrusion T is provided on the limiting device. The protrusion T enters different slots to form a snap-fit ​​structure. For example, when the protrusion T is located in the first slot C1, the first retaining structure is formed; when the protrusion T is located in the second slot C2, the second retaining structure is formed. Of course, a snap-fit ​​structure can also be omitted, that is, the first slot C1 and the second slot C2 are not provided, and a similar effect can be achieved by using an interference fit between the protrusion T and the housing 2.

[0074] like Figure 14 As a variation of this embodiment, a spring foot T1 is provided on the limiting device, and a protrusion T is provided on the spring foot T1. During the movement of such a limiting device, the spring foot T1 will deform. As the protrusion switches back and forth between the first slot C1 and the second slot C2, the spring foot T1 will deform, which is beneficial for the protrusion T to quickly enter the slot when it reaches a certain slot. At the same time, the setting of the spring foot T1 will also help reduce the rigid collision force between the shell and the limiting device when the protrusion T leaves a certain slot.

[0075] like Figure 15 As shown, in this embodiment, the first slot C1 and the second slot C2 are connected by a transition surface C3, and the transition surface C3 has a raised position C4; the protrusion T always abuts against the transition surface C3 when switching back and forth between the first slot C1 and the second slot C2, and the deformation of the spring foot T1 is the largest when the protrusion T abuts against the raised position C4.

[0076] The structure of the transition surface C3 and the spring foot T1 can prevent the spring foot T1 from moving backward when it passes the raised position C4, and can even accelerate the movement of the limiting device to a certain extent. Example 8

[0077] like Figure 16-18 As shown, the difference between Embodiment 8 and Embodiment 7 is that the limiting device and the upper cover 2a are not movable, but rotatable. The limiting device has a limiting part G1 located inside the housing 2, and a driving part Q1 (which can be a handle, grip, etc.) that can be operated from outside the housing 2. The driving part Q1 does not necessarily have to protrude from the housing 2; it can also be completely inside the housing 2, as long as the housing 2 has a corresponding operating hole. In this embodiment, the limiting device can be rotated to a first position (the limiting part G1 restricts the movement of the traction rod 16) by external force, and it can also be rotated to a second position (the limiting part G1 no longer restricts the movement of the traction rod 16) by external force. In the first and second positions, the limiting device is held by a first retaining structure and a second retaining structure, respectively. Specifically, the first and second retaining structures are provided with a first slot C1 and a second slot C2 on the housing 2, and a protrusion T on the limiting device. The protrusion T enters different slots to form a snap-fit ​​structure. For example, the first retaining structure is formed when the protrusion T is located in the first slot C1, and the second retaining structure is formed when the protrusion T is located in the second slot C2. Of course, a similar effect can also be achieved without using a snap-fit ​​structure, that is, without opening the first slot C1 and the second slot C2, but by using the protrusion T and the housing 2 in an interference fit.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A closing limit structure for a switchgear, comprising: a housing (2) and an operating mechanism (1) located within the housing (2); the operating mechanism (1) comprises a frame (11), a trip latch (12), a latch (13), a re-latch (14), and a fastener reset component (15); the trip latch (12) and the latch (13) are rotatably disposed with the frame (11); the re-latch (14) is rotatably disposed with the frame (11) or the housing (2); when the operating mechanism (1) is in the closed state, the trip latch (12) is locked with the latch (13), and the re-latch (14) abuts or engages with the latch (13) to make the trip latch (12), the latch (13), and the re-latch (14) form a stable state; Its features are: It also includes a limiting device, which is detachably configured with respect to the housing (2), or rotatably configured with respect to the housing (2), or movable configured with respect to the housing (2); the limiting device has a first position for limiting the rotation of the re-clamp (14) to limit the rotation of the re-clamp (14), so that the trip latch (12), the lock latch (13), and the re-clamp (14) are stably in the steady state of the closed state; the limiting device is driven by an external force to disengage from the first position to release the restriction on the re-clamp (14).

2. The closing limit structure of a switching device according to claim 1, characterized in that... The limiting device and the housing (2) are provided with a first retaining structure. The first retaining structure is a mechanical connection structure whose connection state changes after being subjected to external force. The limiting device is kept in the first position by the first retaining structure when no external force is applied.

3. The closing limit structure of a switching device according to claim 2, characterized in that... It also includes a reset member (FW1). When the limiting device is in the first position, the reset member (FW1) is in an energy storage state and is used to provide a reset force to the limiting device to move away from the first position after the first holding structure is released. The reset force is less than the holding force provided by the first holding structure.

4. The closing limit structure of a switching device according to claim 2 or 3, characterized in that... The first retaining structure is a threaded structure, and the housing (2) has a threaded hole (LW1). The limiting device includes a limiting part (G1) that forms a threaded engagement with the threaded hole (LW1) and a driving part (Q1) for direct or indirect operation. The limiting part (G1) is used to limit the rotation of the re-clamp (14).

5. The closing limit structure of a switching device according to claim 4, characterized in that... The housing (2) has a cavity (R1) for accommodating the limiting device, and a threaded hole (LW1) is located at the bottom of the cavity (R1).

6. The closing limit structure of a switching device according to claim 5, characterized in that... The housing (2) includes a top cover (2a), a base (2b), and a cavity support (2c). The cavity (R1) is disposed on the cavity support (2c). The top cover (2a) is provided with an operation hole (CZ1) communicating with the cavity (R1). The limiting device is placed in the cavity (R1) after it is completely disengaged from the first position. The cavity support (2c) and the top cover (2a) are integral parts, or the cavity support (2c) and the base (2b) are integral parts, or the cavity support (2c) and the top cover (2a) are connected by fasteners, or the cavity support (2c) and the base (2b) are connected by fasteners.

7. A closing limit structure for a switching device according to claim 2 or 3, characterized in that... The limiting device is rotatably or movablely disposed with the housing (2). The limiting device also includes a second position, which is the position after the limiting device is disengaged from the first position. A second retaining structure is provided between the limiting device and the housing (2). Both the first retaining structure and the second retaining structure are interference fit structures or snap-fit ​​structures, so as to keep the limiting device in the second position when no external force is applied.

8. The closing limit structure of a switching device according to claim 7, characterized in that... The limiting device and the housing (2) are provided with a first slot (C1) and a second slot (C2), and the other is provided with a protrusion (T); when the protrusion (T) is located in the first slot (C1), it forms the first retaining structure, and when the protrusion (T) is located in the second slot (C2), it forms the second retaining structure; the protrusion (T) can switch back and forth between the first slot (C1) and the second slot (C2) by rotating or moving the limiting device.

9. The closing limit structure of a switching device according to claim 7, characterized in that... The limiting device and the housing (2) are provided with a first slot (C1) and a second slot (C2), and the other is provided with a spring foot (T1) with a protrusion (T); when the protrusion (T) is in the first slot (C1), it forms the first retaining structure, and when the protrusion (T) is in the second slot (C2), it forms the second retaining structure; the protrusion (T) can switch back and forth between the first slot (C1) and the second slot (C2) by moving the limiting device.

10. The closing limit structure of a switching device according to claim 9, characterized in that... The first slot (C1) and the second slot (C2) are connected by a transition surface (C3), which has a raised position (C4). The protrusion (T) always abuts against the transition surface (C3) when switching back and forth between the first slot (C1) and the second slot (C2). The deformation of the spring foot (T1) is the largest when the protrusion (T) abuts against the raised position (C4).

11. The closing limit structure of a switching device according to claim 2, characterized in that... The first retaining structure is a tearable low-strength connection structure. A discontinuous break is provided between the limiting device and the housing (2) to form the tearable low-strength connection structure. The housing (2) is provided with a mating hole (PH1). One end of the limiting device is a limiting part (G1), which is inserted into the housing (2) through the mating hole (PH1) to limit the rotation of the re-fastener (14).

12. The closing limit structure of a switching device according to claim 2, characterized in that: The first retaining structure is an interference fit structure. The housing (2) has a mating hole (PH1) and the limiting device is inserted into the mating hole (PH1) to form an interference fit. The limiting device includes a limiting part (G1) located in the housing (2) and the limiting part (G1) is used to limit the rotation of the re-clamp (14).

13. The closing limit structure of a switching device according to claim 1, characterized in that... It also includes a traction rod, the traction rod (16) being rotatably mounted to the frame (11), the re-clamp (14) being fixed to the traction rod (16) or the re-clamp (14) and the traction rod (16) being an integral part; the limiting device, when in the first position, is located within the rotation trajectory of the re-clamp (14) or the traction rod (16) to limit the rotation of the re-clamp (14).

14. The closing limit structure of a switching device according to claim 1, characterized in that... The operating mechanism also includes an upper connecting rod (18), a main tension spring (19), a hinge shaft (20), and a lever (17) rotatably connected to the frame (11). One end of the upper connecting rod (18) is rotatably connected to the jump buckle (12), and the other end is connected to the hinge shaft (20). The two ends of the main tension spring (19) are respectively connected to the lever (17) and the hinge shaft (20). When the operating mechanism (1) is in the closed state, the main tension spring (19) is in the deformed state.

15. The closing limit structure of a switching device according to claim 14, characterized in that... An operating handle (21) is fixed on the lever, and part of the operating handle (21) extends out of the housing (2).

16. The closing limit structure of a switching device according to claim 14, characterized in that... The housing (2) is provided with an operating knob (22), which is connected to the lever (17) through a gear transmission structure or a linkage transmission structure, so that the operating knob (22) drives the lever (17) to rotate.

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