Isolation circuit breaker and middle door interlocking structure thereof

Abstract

The utility model provides an isolation circuit breaker and a middle door interlocking structure thereof. The interlocking structure comprises a middle door locking assembly and an isolation operation limiting assembly. The middle door locking assembly is used for being in linkage with a working state switching device of the isolation circuit breaker, locking and unlocking of a middle door of the isolation circuit breaker are achieved, when the isolation circuit breaker is switched from the isolation position to the working position, the middle door is locked, and when the isolation circuit breaker is switched from the working position to the isolation position, locking of the middle door is relieved, so that the middle door can be opened. The isolation operation limiting assembly is arranged in an operating mechanism of the isolation circuit breaker close to an operating contact of the isolation motor, and can be blocked in an insertion channel between the isolation operation handle and the operating contact when the middle door is opened to limit the insertion of the isolation operation handle and the operating contact. When the middle door is closed, the insertion channel can be reserved under the pressing effect of the isolation operation handle so that the isolation operation handle can be connected with the operation contact in an inserted mode, the problem of entering an electrified interval is solved, and operation safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage switchgear technology, and more specifically, to an isolating circuit breaker and its interlocking structure. Background Technology

[0002] The longitudinal rotating isolating circuit breaker integrates a high-voltage vacuum circuit breaker and a high-voltage disconnecting switch. It uses a circuit-breaking operating mechanism to drive the moving contacts of the vacuum interrupter within the three-phase poles to open and close the circuit, and an isolating operating mechanism to achieve the isolation function by longitudinally rotating the three-phase poles. To prevent the intermediate door (the door corresponding to the handcart position) from opening when the isolating circuit breaker is in the working position, thus preventing entry into the energized compartment, avoiding electric shock accidents, and preventing operator misoperation and improving isolation operation safety, the longitudinal rotating isolating circuit breaker is equipped with an interlocking device. The intermediate door can only be opened when the isolating circuit breaker is in the isolated position, and the disconnecting switch can only be operated when the intermediate door is closed. That is, the isolating operating handle can only be inserted and connected to the operating contacts on the isolating motor after the intermediate door is closed to control the isolating motor for isolation function control. Currently, the interlocking device structure in the longitudinal rotating isolating circuit breaker is relatively complex and occupies a large installation space, resulting in a large size of the switchgear. Utility Model Content

[0003] The purpose of this utility model is to provide a simple and highly secure middle door interlocking structure and an isolation circuit breaker that uses this middle door interlocking structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] In one aspect, this utility model provides a middle door interlocking structure, suitable for installation in an isolating circuit breaker to achieve interlocking between the middle door and the isolating operation. It includes a middle door locking component and an isolating operation limiting component. The middle door locking component is used in conjunction with the isolating circuit breaker's operating state switching device to lock and unlock the middle door. When the isolating circuit breaker switches from the isolating position to the operating position, the middle door is locked; when the isolating circuit breaker switches from the operating position to the isolating position, the middle door is unlocked, allowing it to be opened. The isolating operation limiting component is located near the operating contact of the isolating motor in the isolating circuit breaker's operating mechanism. When the middle door is open, it can block the insertion channel between the isolating operating handle and the operating contact, restricting the insertion of the operating handle and the operating contact. When the middle door is closed, the insertion channel can be opened by the pressure of the isolating operating handle, allowing the operating handle and the operating contact to insert.

[0006] In one embodiment, the middle door locking assembly includes a latch and a locking rod; the latch is used to fix to the inside of the middle door and define an annular latch structure with the middle door, the annular latch structure being located above the operating mechanism; the locking rod is disposed within the operating mechanism, and the locking rod can be driven upward to extend from the top of the operating mechanism and pass through the annular latch structure, or retracted into the operating mechanism to disengage from the annular latch structure.

[0007] Furthermore, the middle door locking assembly also includes a linkage mechanism and a linkage plate; the linkage mechanism includes a linkage seat, a linkage shaft, a first linkage, and a second linkage, the linkage seat is used to fix it to the frame inside the operating mechanism, the linkage shaft is rotatably passed through the linkage seat, and one end of each of the first and second linkages is connected to the linkage shaft; the linkage plate is connected to the other end of the first linkage, and the linkage plate is also used to connect to the working state switching device so as to slide horizontally as the working state of the isolating circuit breaker switches; the lower end of the locking rod is connected to the other end of the second linkage.

[0008] In one embodiment, the connecting rod seat includes a seat plate, a fixing plate formed by bending one end of the seat plate upwards, and a pair of side plates formed by bending both sides of the seat plate upwards. The fixing plate has fixing holes for passing through fixing members and fixing to the frame. Each of the pair of side plates has a connecting rod shaft hole. The connecting rod shaft passes through the pair of connecting rod shaft holes and its two ends pass through the side plates respectively. The first connecting rod and the second connecting rod are connected to the parts where the connecting rod shafts pass through.

[0009] In one embodiment, the isolation operation limiting assembly includes a limiting rod and a linkage crank; at least a portion of the limiting rod is horizontally positioned in front of the operating contact, and this at least portion can be rotated away from the insertion channel by the isolation operation handle when the middle door is closed; the linkage crank includes an integrally formed clamping rod and a pressing rod, the clamping rod abutting against one side of the limiting rod, and the upper end of the pressing rod protruding from the operating mechanism and can be pushed away from the rotation path of the limiting rod by the locking buckle.

[0010] In one embodiment, an acute angle is defined between the abutment rod and the contact rod, and the size of the contact rod gradually decreases in the direction away from the connection between the abutment rod and the contact rod.

[0011] Furthermore, the isolation operation limiting component also includes a mounting base, which includes an integrally formed horizontal mounting plate and a vertical fixing plate. The limiting rod is rotatably mounted on the horizontal mounting plate, and the vertical fixing plate is used to fix it to the frame of the operating mechanism.

[0012] Furthermore, the isolation operation limiting assembly also includes a tension spring and a connecting rod, wherein the connecting rod and the limiting rod are integrally formed at an angle, and the two ends of the tension spring are respectively connected to the transverse mounting plate and the connecting rod.

[0013] In one embodiment, the connecting rod has multiple spring connection holes along its length; the transverse mounting plate includes a rectangular body and an extension arm, the rectangular body has a pivot mounting hole near its corner, the limiting rod is mounted on the transverse mounting plate by inserting the pivot into the pivot mounting hole, the extension arm is located on the rectangular body away from the pivot mounting hole, and the extension arm has a spring connection hole at the location away from the rectangular body; the two ends of the tension spring are respectively hooked onto the spring connection holes of the connecting rod and the extension arm.

[0014] As a second aspect, this utility model also provides an isolating circuit breaker, including a cabinet, a handcart detachably disposed within the cabinet, a middle door detachably connected to the cabinet and disposed at a position corresponding to the handcart, and the aforementioned middle door interlocking structure. The handcart includes a handcart frame and three-phase poles and an operating mechanism disposed on the handcart frame. The operating mechanism is used to switch the working state of the three-phase poles. The operating mechanism includes a housing, a frame disposed within the housing, an isolating motor fixed to the frame, and a working state switching device. The isolating motor has an operating contact, which is used to operate the isolating switch under the action of the isolating operating handle. The middle door locking component and the working state switching device lock or unlock the middle door according to the working state of the isolating circuit breaker. The isolating operation limiting component restricts the docking of the isolating operating handle and the operating contact or releases the restriction of the insertion channel of the isolating operating handle according to the opening and closing state of the middle door.

[0015] The beneficial effects of the technical solution provided by this utility model are as follows: In the interlocking structure of the middle door of this utility model, the locking and unlocking of the middle door is achieved by linking the middle door locking component with the working state switching device of the isolating circuit breaker. The middle door can only be opened when the isolating circuit breaker is in the isolation position, and cannot be opened when it is in the working position. This can prevent the middle door from being opened in the working state and prevent entry into the energized compartment. The isolation operation limit component is linked with the opening and closing state of the middle door to avoid operation of the isolation when the middle door is open, prevent no operation, prevent damage to the isolating circuit breaker equipment, and improve operational safety. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the middle door interlocking structure provided in one embodiment of the present invention in the middle door open state;

[0018] Figure 2 for Figure 1 The diagram shown is a schematic diagram of the middle door interlocking structure in the middle door locked state;

[0019] Figure 3 This is a schematic diagram of the structure of a middle door locking assembly provided in one embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the structure of a connecting rod seat provided in one embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of an isolation operation limiting component provided in one embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the limiting rod and connecting rod provided in one embodiment of the present utility model;

[0023] Figure 7 This is a schematic diagram of the linkage lever provided in one embodiment of the present utility model;

[0024] Figure 8 This is a schematic diagram of the structure of a mounting base provided in one embodiment of the present utility model;

[0025] Figure 9 A schematic diagram of the operating mechanism in the middle door open state according to an embodiment of the present utility model;

[0026] Figure 10 This is a schematic diagram of the operating mechanism in the middle door locked state according to an embodiment of the present invention. Detailed Implementation

[0027] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0028] It should be understood that the steps described in the method embodiments of this utility model may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this utility model is not limited in this respect.

[0029] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "connection" can refer to a direct connection or an indirect connection via intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description.

[0030] It should be noted that the concepts of "first" and "second" mentioned in this utility model are only used to distinguish between devices, modules or units, and are not used to limit these devices, modules or units to necessarily be different devices, modules or units, nor are they used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0031] See Figures 1 to 10 This utility model relates to an isolating circuit breaker and its interlocking structure 100, which is used to improve the operational safety of the isolating circuit breaker.

[0032] The isolating circuit breaker also includes a cabinet, a detachable handcart housed within the cabinet, and a central door connected to the cabinet and positioned corresponding to the handcart. The handcart includes a handcart frame, three-phase terminals mounted on the frame, and an operating mechanism 1000. The operating mechanism 1000 is used to switch the operating state of the isolating circuit breaker, for example, to operate the three-phase terminals in circuit breaker mode or disconnector mode. The operating mechanism 1000 includes a housing, a frame housed within the housing, an isolating motor 200 fixed to the frame, and an operating state switching device. The isolating motor 200 has an operating contact 210, which is used to operate the disconnector switch under the action of the isolating operating handle. The central door interlocking structure 100 prevents the central door from being opened when the isolating circuit breaker is in operation and prevents the disconnector switch from being operated when the central door is open, thereby improving the operational safety of the isolating circuit breaker and solving the problem of entering a energized compartment.

[0033] The isolation motor 200 is a forward and reverse motor, which can switch the working state of the isolation switch under the action of the operating contact 210. The working state switching device is used to realize the switching of the isolation circuit breaker between the isolation state and the working state.

[0034] The middle door interlocking structure 100 includes a middle door locking component 10 and an isolation operation limit component 20. The middle door locking component 10 is used to lock and unlock the middle door, and the isolation operation limit component is used to restrict the insertion of the isolation operation handle or to release the restriction on the isolation operation handle.

[0035] In one embodiment, the middle door locking component 10 is used to link with the working state switching device of the isolating circuit breaker to realize the locking and unlocking of the middle door of the isolating circuit breaker. When the isolating circuit breaker switches from the isolation position to the working position, the middle door is locked. When the isolating circuit breaker switches from the working position to the isolation position, the locking of the middle door is released so that the middle door can be opened. Thus, the middle door can be prevented from being opened when the isolating circuit breaker is in the working position, preventing operators from entering the energized compartment.

[0036] The operating contact 210 of the isolation operation limiting component 20 near the isolation motor 200 is disposed in the operating mechanism 1000. When the middle door is open, it can block the insertion channel between the isolation operation handle and the operating contact 210, restricting the insertion of the isolation operation handle and the operating contact 210. When the middle door is closed, the insertion channel can be opened by the pressure of the isolation operation handle to allow the isolation operation handle and the operating contact 210 to be inserted.

[0037] In one embodiment, the middle door locking assembly 10 includes a latch 11 and a locking rod 12, both of which are formed from sheet metal.

[0038] The latch 11 is generally U-shaped and is used to fix to the inside of the middle door and define a ring latch 11 structure with the middle door. Optionally, when the middle door is closed, the ring latch 11 structure is located above the operating mechanism 1000.

[0039] The locking rod 12 is located within the operating mechanism 1000, and the upper end of the locking rod 12 can be driven to extend upward from the top of the operating mechanism 1000 and pass through the annular latch 11 structure, blocking the movement path of the latch 11 when the middle door is opened, thus preventing the middle door from being opened, or the upper end of the locking rod 12 can be driven to retract into the operating mechanism 1000 and disengage from the annular latch 11 structure.

[0040] Furthermore, the middle door locking assembly 10 also includes a linkage mechanism and a linkage plate 13. The linkage mechanism includes a linkage seat 14, a linkage shaft 15, a first linkage 16, and a second linkage 17. The linkage seat 14 is used to fix to the frame inside the operating mechanism 1000. The linkage shaft 15 is rotatably passed through the linkage seat 14. One end of the first linkage 16 and the second linkage 17 are respectively connected to the linkage shaft 15. The linkage plate 13 is connected to the other end of the first linkage 16. The linkage plate 13 is also used to connect to the working state switching device so as to slide horizontally as the working state of the isolating circuit breaker switches. The lower end of the locking rod 12 is connected to the other end of the second linkage 17.

[0041] It should be noted that in this embodiment, the linkage plate 13 moves horizontally left and right along with the working state switching device. When the isolating circuit breaker switches from the working position to the isolating position, the linkage plate 13 slides from left to right; when the isolating circuit breaker switches from the isolating position to the working position, the linkage plate 13 slides from right to left. The linkage plate 13 is connected to the upper end of the first connecting rod 16, and the locking rod 12 is connected to the right end of the second connecting rod 17, and can move up and down when the upper end of the first connecting rod 16 slides left and right. The lower end of the first connecting rod 16 and the left end of the second connecting rod 17 can be connected to other plates (or rods) to realize other functions of the isolating circuit breaker, such as grounding function or interlocking of the handcart. Since these are not key points of this utility model, they will not be elaborated on here.

[0042] In one embodiment, the connecting rod seat 14 includes a seat plate, a fixing plate 141 formed by bending one end of the seat plate upward, and a pair of side plates 142 formed by bending both sides of the seat plate upward. The fixing plate 141 has fixing holes for fasteners (e.g., bolts) to pass through and fix to the frame. The pair of side plates 142 have connecting rod shaft holes 1421. The connecting rod shaft 15 passes through the pair of connecting rod shaft holes 1421 and its two ends pass through the side plates 142 respectively. The first connecting rod 16 and the second connecting rod 17 are connected to the parts where the connecting rod shaft 15 passes through.

[0043] The working principle of the middle door locking component 10 of this utility model is as follows:

[0044] When the isolating circuit breaker switches from the working state to the isolated state under the action of the working state switching device, the linkage plate 13 slides from left to right, thereby driving the first connecting rod 16 to rotate clockwise. The second connecting rod 17 rotates clockwise under the action of the connecting rod shaft 15, thereby driving the locking rod 12 connected to the second connecting rod 17 to move downward. When the isolating circuit breaker is switched to the isolated position, the upper end of the locking rod 12 is at its lowest position, retracting into the housing of the operating mechanism 1000 and separating from the latch 11, opening the movement channel of the latch 11, and the middle door can be opened. Conversely, when the isolating circuit breaker switches from the isolated state to the working state, the linkage plate 13 slides from right to left, thereby driving the first connecting rod 16 to rotate counterclockwise. The second connecting rod 17 rotates counterclockwise under the action of the connecting rod shaft 15, thereby driving the locking rod 12 connected to the second connecting rod 17 to move upward. When the isolating circuit breaker is in the working position, the upper end of the locking rod 12 reaches its highest point. At this time, if the middle door is opened, the middle door lock plate is blocked by the plate and cannot be opened. Therefore, by linking the middle door locking component 10 with the working state switching device of the isolating circuit breaker, the locking and unlocking of the middle door can be reliably realized.

[0045] In one embodiment, the isolation operation limiting assembly 20 includes a limiting rod 21 and a linkage crank 22. At least a portion of the limiting rod 21 is horizontally positioned in front of the operating contact 210, and this portion can be rotated away from the insertion channel by the isolation operation handle when the middle door is closed. The linkage crank 22 includes an integrally formed clamping rod 221 and a pressing rod 222. The clamping rod 221 abuts against one side of the limiting rod 21, and the upper end of the pressing rod 222 extends through the operating mechanism 1000 and can rotate under the push of the latch 11 when the middle door is closed, thereby causing the clamping rod 221 to leave the rotation path of the limiting rod 21.

[0046] In this embodiment, the limiting rod 21 is configured to rotate in the horizontal direction, and the linkage crank 22 is configured to rotate in the vertical direction. Thus, the locking and unlocking of the isolation operation is completed through the movement in two vertical directions, which simplifies the design of the interlocking structure, reduces the volume of the interlocking structure, and consequently reduces the size of the isolation circuit breaker.

[0047] In one embodiment, an acute angle is defined between the clamping rod 221 and the pressing rod 222, and the size of the pressing rod 222 gradually decreases away from the connection point between the clamping rod 221 and the pressing rod 222. This causes the center of gravity of the linkage lever 22 to be lower, allowing it to automatically reset under gravity and abut against one side of the limiting rod 21 after the pushing force on the pressing rod 222 is removed. Optionally, the linkage lever 22 is rotatably connected to the frame within the operating mechanism 1000 via a pivot.

[0048] Furthermore, the isolation operation limiting component 20 also includes a mounting base 23, which includes an integrally formed horizontal mounting plate 231 and a vertical fixing plate 232. The limiting rod 21 is rotatably mounted on the horizontal mounting plate 231, and the vertical fixing plate 232 is used to fix it to the frame of the operating mechanism 1000.

[0049] Furthermore, the isolation operation limiting assembly 20 also includes a tension spring 24 and a connecting rod 25. The connecting rod 25 and the limiting rod 21 are integrally formed with an included angle. The two ends of the tension spring 24 are respectively connected to the transverse mounting plate and the connecting rod 25, and are used to reset the limiting rod 21 horizontally at the front end of the operating contact 210 after the isolation operation handle is pulled out (i.e. the pushing force of the operation handle on the limiting rod 21 is removed).

[0050] In one embodiment, the connecting rod 25 has multiple spring connection holes along its length; the transverse mounting plate includes a rectangular body and an extension arm. A pivot mounting hole 2311 is provided near the corner of the rectangular body. The limiting rod 21 is mounted to the transverse mounting plate 231 by inserting a pivot into the pivot mounting hole 2311. The extension arm is located on the rectangular body away from the pivot mounting hole, and a spring connection hole 2312 is provided on the extension arm away from the rectangular body. The two ends of the tension spring 24 are hooked onto the spring connection holes 251 and 2312 of the connecting rod 25 and the extension arm, respectively. By providing a smaller extension arm on one side of the rectangular body, instead of widening the entire rectangular body (using a large rectangular plate), the weight of the mounting base 23 can be reduced.

[0051] During the closing process of the middle door, the latch 11 on the inner side of the middle door pushes the contact rod 222 of the linkage lever 22 to rotate clockwise, causing the abutment rod 221 to tilt upwards and leave the rotation path of the limit rod 21, releasing the rotation restriction of the limit rod 21. This allows the isolation operating handle to push the limit rod 21 to rotate away from the insertion channel, and the isolation operating handle can be inserted into the operating contact 210 of the isolation motor 200. When the isolation operating handle is pulled out, the limit rod 21 returns to its original position under the action of the tension spring 24. When the middle door is opened, the linkage lever 22 rotates counterclockwise to return to its original position under the action of gravity, causing the abutment rod 221 to press against one side of the limit rod 21, locking the rotation path of the limit rod 21. The isolation operating handle cannot be inserted, thus achieving the interlocking function requirement.

[0052] Therefore, by linking the isolation limit component with the opening and closing state of the middle door, the isolation operation handle can be prevented from performing isolation operations when the middle door is open, thus improving the safety of isolation operations.

[0053] Understandably, the housing of the operating mechanism 1000 is provided with clearance holes corresponding to the locking rod 12 of the middle door locking assembly 10 and the linkage crank 22 of the isolation operation limiting assembly 20. One clearance hole corresponding to the linkage crank 22 extends along the insertion direction of the isolation operation handle (i.e., the front and rear direction of the housing), so that the contact rod 222 of the linkage crank 22 can move back and forth.

[0054] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this utility model is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features of this utility model that have similar functions.

[0055] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A middle door interlocking structure, suitable for installation in an isolating circuit breaker to achieve interlocking between the middle door of the isolating circuit breaker and the isolating operation, characterized in that, include: Middle door locking assembly and isolation operation limit assembly; The middle door locking component is used to link with the working state switching device of the isolating circuit breaker to realize the locking and unlocking of the middle door of the isolating circuit breaker. When the isolating circuit breaker switches from the isolation position to the working position, the middle door is locked. When the isolating circuit breaker switches from the working position to the isolation position, the middle door is unlocked so that the middle door can be opened. The operating contact of the isolation operation limit component near the isolation motor is located in the operating mechanism of the isolation circuit breaker. When the middle door is open, it can block the insertion channel between the isolation operation handle and the operating contact, restricting the insertion of the isolation operation handle and the operating contact. When the middle door is closed, the insertion channel can be opened by the pressure of the isolation operation handle to allow the isolation operation handle and the operating contact to be inserted.

2. The interlocking structure for the middle door according to claim 1, characterized in that, The middle door locking assembly includes a latch and a locking bar; The latch is used to fix to the inside of the middle door and define a ring-shaped latch structure with the middle door. The ring-shaped latch structure is located above the operating mechanism. The locking rod is located within the operating mechanism, and the locking rod can be driven to rise and extend from the top of the operating mechanism to pass through the annular locking structure, or retract into the operating mechanism to disengage from the annular locking structure.

3. The interlocking structure for the middle door according to claim 2, characterized in that, The middle door locking assembly also includes a linkage mechanism and a linkage plate; The linkage mechanism includes a linkage seat, a linkage shaft, a first linkage, and a second linkage. The linkage seat is used to fix it to the frame inside the operating mechanism. The linkage shaft is rotatably inserted through the linkage seat. One end of each of the first linkage and the second linkage is connected to the linkage shaft. The linkage plate is connected to the other end of the first linkage, and the linkage plate is also used to connect to the working state switching device so as to slide horizontally as the working state of the isolating circuit breaker switches. The lower end of the locking rod is connected to the other end of the second connecting rod.

4. The interlocking structure for the middle door according to claim 3, characterized in that, The connecting rod seat includes a seat plate, a fixing plate formed by bending one end of the seat plate upwards, and a pair of side plates formed by bending both sides of the seat plate upwards. The fixing plate has fixing holes for fasteners to pass through and fix to the frame. Each of the pair of side plates has a connecting rod shaft hole. The connecting rod shaft passes through the pair of connecting rod shaft holes and its two ends pass through the side plates respectively. The first connecting rod and the second connecting rod are connected to the parts where the connecting rod shafts pass through.

5. The interlocking structure for the middle door according to claim 1, characterized in that, The isolation operation limiting component includes a limiting rod and a linkage crank; The limiting rod has at least a portion of its structure horizontally positioned in front of the operating contact, and this portion of its structure can be isolated and rotated away from the insertion channel by the operating handle when the middle door is closed; The linkage lever includes an integrally formed clamping rod and a pressing rod. The clamping rod abuts against one side of the limiting rod, and the upper end of the pressing rod passes through the operating mechanism and can cause the clamping rod to leave the rotation path of the limiting rod under the push of the latch.

6. The interlocking structure for the middle door according to claim 5, characterized in that, An acute angle is defined between the clamping rod and the pressing rod, and the size of the pressing rod gradually decreases in the direction away from the connection between the clamping rod and the pressing rod.

7. The interlocking structure for the middle door according to claim 5, characterized in that, The isolation operation limiting assembly also includes a mounting base, which includes an integrally formed horizontal mounting plate and a vertical fixing plate. The limiting rod is rotatably mounted on the horizontal mounting plate, and the vertical fixing plate is used to fix it to the frame of the operating mechanism.

8. The interlocking structure for the middle door according to claim 7, characterized in that, The isolation operation limiting assembly also includes a tension spring and a connecting rod. The connecting rod and the limiting rod are integrally formed at an angle. The two ends of the tension spring are respectively connected to the horizontal mounting plate and the connecting rod.

9. The interlocking structure for the middle door according to claim 8, characterized in that, The connecting rod is provided with multiple spring connection holes along its length; The horizontal mounting plate includes a rectangular body and an extension arm. A pivot mounting hole is provided on the rectangular body near the corner. The limiting rod is installed on the horizontal mounting plate by inserting the pivot into the pivot mounting hole. The extension arm is located on the rectangular body away from the pivot mounting hole. A spring connection hole is provided on the extension arm away from the rectangular body. The two ends of the tension spring are hooked onto the spring connection holes of the connecting rod and the extension arm, respectively.

10. A disconnecting circuit breaker, comprising a cabinet, a detachable handcart disposed within the cabinet, and a central door connected to the cabinet and positioned corresponding to the handcart, the handcart comprising a handcart frame and three-phase poles and an operating mechanism disposed on the handcart frame, the operating mechanism being used to switch the operating states of the three-phase poles, the operating mechanism comprising a housing, a frame disposed within the housing, an disconnecting motor fixed to the frame, and an operating state switching device, the disconnecting motor having an operating contact, the operating contact being used to operate the disconnecting switch to disconnect under the action of an disconnecting operating handle, characterized in that... It also includes the middle door interlocking structure according to any one of claims 1 to 9, wherein the middle door locking component and the working state switching device lock or unlock the middle door according to the working state of the isolating circuit breaker, and the isolating operation limit component restricts the docking of the isolating operation handle with the operating contact or releases the restriction of the insertion channel of the isolating operation handle according to the opening and closing state of the middle door.

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