Isolation circuit breaker and middle door interlocking structure thereof

Abstract

The invention 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] The present invention relates to the technical field of high-voltage switchgear, and in particular to an isolating circuit breaker and a middle door interlocking structure thereof. Background Art

[0002] The longitudinal rotation isolating circuit breaker combines the high-voltage vacuum circuit breaker and the high-voltage isolating switch into one. The circuit breaker operating mechanism drives the moving contact of the vacuum interrupter in the three-phase pole to open and close the circuit, and the isolating operating mechanism is used to rotate the three-phase pole longitudinally to achieve the isolation function. In order to prevent the middle door (the door leaf corresponding to the trolley position) from opening when the isolating circuit breaker is in the working position, avoid entering the energized interval, avoid electric shock accidents, and prevent staff from operating incorrectly and improve the safety of isolation operation, an interlocking device is provided in the longitudinal rotation isolating circuit breaker. The middle door can only be opened when the isolating circuit breaker is in the isolation position, and the isolating switch can only be operated when the middle door of the longitudinal rotation isolating circuit breaker is closed, that is, the isolation operating handle can be inserted after the middle door is closed to connect with the operating contact on the isolation motor to control the isolation motor to control the isolation function. At present, the interlocking device structure in the longitudinal rotation isolating circuit breaker is relatively complex, occupies a large installation space, and causes the size of the switchgear to be large. Summary of the invention

[0003] The object of the present invention is to provide a middle door interlocking structure with simple structure and high safety and an isolating circuit breaker using the middle door interlocking structure.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] As one aspect, the present invention provides a middle door interlocking structure, which is suitable for being arranged in an isolating circuit breaker to realize the interlocking of the middle door of the isolating circuit breaker and the isolating operation, and includes a middle door locking component and an isolating operation limiting component. The middle door locking component is used to interlock 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 is switched from the isolating position to the working position, the middle door is locked. When the isolating circuit breaker is switched from the working position to the isolating position, the middle door is unlocked so that the middle door can be opened. The isolating operation limiting component is arranged in the operating mechanism of the isolating circuit breaker near the operating contact of the isolating motor, and can be blocked in the insertion channel between the isolating operating handle and the operating contact when the middle door is opened, so as to limit the plugging of the isolating operating handle and the operating contact. When the middle door is closed, the insertion channel can be released under the pressing action of the isolating operating handle for plugging of the isolating operating handle and the operating contact.

[0006] In one embodiment, the middle door locking assembly includes a lock catch and a lock rod; the lock catch is used to be fixed to the inner side of the middle door and defines an annular lock catch structure with the middle door, and the annular lock catch structure is located above the operating mechanism; the lock rod is arranged in the operating mechanism, and the lock rod can be driven to rise from the top of the operating mechanism to pass through the annular lock catch structure, or retract the operating mechanism to disengage from the annular lock catch structure.

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

[0008] In one embodiment, the connecting rod seat includes a seat plate, a fixed plate formed by bending one end of the seat plate upward, and a pair of side plates formed by bending both sides of the seat plate upward, the fixed plate is provided with a fixing hole for passing a fixing part to fix to the frame, the pair of side plates are each provided with a connecting rod shaft hole, the connecting rod shaft is passed through the pair of connecting rod shaft holes and the two ends are respectively passed through the side plates, and the first connecting rod and the second connecting rod are connected to the position where the connecting rod shaft passes through.

[0009] In one embodiment, the isolation operation limit assembly includes a limit rod and a linkage crank rod; at least part of the structure of the limit rod is horizontally arranged in front of the operating contact, and at least part of the structure can be pressed by the isolation operation handle to rotate away from the insertion channel when the middle door is closed; the linkage crank rod includes an integrally formed clamping rod and a pressure rod, the clamping rod is pressed against one side of the limit rod, and the upper end of the pressure rod passes through the operating mechanism and can make the clamping rod leave the rotation path of the limit rod under the pressure of the lock.

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

[0011] Furthermore, the isolation operation limit assembly also includes a mounting seat, which includes an integrally formed transverse mounting plate and a vertical fixing plate, the limit rod is rotatably mounted on the transverse mounting plate, and the vertical fixing plate is used to be fixed to the frame of the operating mechanism.

[0012] Furthermore, the isolation operation limit assembly also includes a tension spring and a connecting rod. The connecting rod and the limit rod are integrally formed in a manner of having an included angle. 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 is provided with a plurality of spring connecting holes along its length direction; the transverse mounting plate comprises a rectangular main body and an extension arm, a rotating shaft mounting hole is provided on the rectangular main body near the corner end, the limiting rod is installed on the transverse mounting plate by inserting the rotating shaft into the rotating shaft mounting hole, the extension arm is provided at a position of the rectangular main body away from the rotating shaft mounting hole, and a spring connecting hole is provided at a position of the extension arm away from the rectangular main body; the two ends of the tension spring are respectively hooked on the spring connecting holes of the connecting rod and the extension arm.

[0014] As a second aspect, the present invention also provides an isolating circuit breaker, comprising a cabinet, a trolley pluggably arranged in the cabinet, a middle door that can be opened and closed and connected to the cabinet and is arranged at a position corresponding to the trolley, and the above-mentioned middle door interlocking structure, the trolley comprises a trolley frame and three-phase poles and an operating mechanism all arranged on the trolley frame, the operating mechanism is used to switch the working state of the three-phase poles, the operating mechanism comprises a box body, a frame arranged in the box body, an isolating motor fixed on the frame and a working state switching device, the isolating motor has an operating contact, the operating contact is used to operate the isolation of the isolating switch under the action of the isolating operating handle, the middle door locking assembly and the working state switching device lock the middle door or release the lock of the middle door according to the working state of the isolating circuit breaker, and the isolation operation limit assembly limits the docking of the isolation operating handle and the operating contact or releases the restriction on the insertion channel of the isolation operating handle according to the opening and closing state of the middle door.

[0015] The beneficial effects brought about by the technical solution provided by the present invention are as follows: in the middle door interlocking structure of the present invention, the locking and unlocking of the middle door are realized by linking the middle door locking component with the working state switching device of the isolating circuit breaker. The middle door can be opened only when the isolating circuit breaker is in the isolation position and cannot be opened when it is in the working position, thereby preventing the middle door from being opened in the working state and preventing entry into the energized interval. The isolation operation limit component is linked with the opening and closing state of the middle door to avoid operating the isolation when the middle door is opened, prevent no operation, avoid damage to the isolating circuit breaker equipment, and improve operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments of the present invention are briefly introduced below.

[0017] Figure 1 A schematic diagram of the structure of a middle door interlocking structure provided by an embodiment of the present invention when the middle door is in an open state;

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

[0019] Figure 3 A schematic diagram of the structure of a middle door locking assembly provided by an embodiment of the present invention;

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

[0021] Figure 5 A schematic diagram of the structure of an isolation operation limit assembly provided by an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the structure of a limit rod and a connecting rod provided in an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of the structure of a linkage turning rod provided by an embodiment of the present invention;

[0024] Figure 8 A schematic diagram of the structure of a mounting base provided by an embodiment of the present invention;

[0025] Fig. 9 A schematic diagram of the structure of an operating mechanism provided by an embodiment of the present invention in a state where the middle door is opened;

[0026] Fig.10 A schematic structural diagram of an operating mechanism provided by an embodiment of the present invention in a middle door locked state. DETAILED DESCRIPTION

[0027] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

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

[0029] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "connected" may be directly connected or indirectly connected through intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0030] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish between devices, modules or units, and are not used to limit these devices, modules or units to 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 also Figures 1 to 10 The present invention relates to an isolating circuit breaker and a door interlocking structure 100 thereof, which are used to improve the operating safety of the isolating circuit breaker.

[0032] The isolating circuit breaker also includes a cabinet, a trolley that is pluggable and arranged in the cabinet, and a middle door that is openably connected to the cabinet and arranged at a position corresponding to the trolley. The trolley includes a trolley frame and three-phase poles and an operating mechanism 1000 that are all arranged on the trolley frame. The operating mechanism 1000 is used to switch the working state of the isolating circuit breaker, for example, to make the three-phase poles work in the circuit breaker state or the isolating switch state. The operating mechanism 1000 includes a box, a frame arranged in the box, an isolating motor 200 fixed on the frame, and a working state switching device. The isolating motor 200 has an operating contact 210, and the operating contact 210 is used to operate the isolation of the isolating switch under the action of the isolating operating handle. The middle door interlocking structure 100 is used to prohibit the middle door from being opened when the isolating circuit breaker is in the working state and prohibit the isolating switch from being operated when the middle door is opened, thereby improving the operating safety of the isolating circuit breaker and solving the problem of entering the live interval.

[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, and 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 assembly 10 and an isolation operation limit assembly 20. The middle door locking assembly 10 is used to realize locking and unlocking of the middle door, and the isolation operation limit is used to limit the insertion of the isolation operation handle or release the restriction on the isolation operation handle.

[0035] In one embodiment, the middle door locking assembly 10 is used to interlock with the working state switching device of the isolating circuit breaker to realize locking and unlocking of the middle door of the isolating circuit breaker. When the isolating circuit breaker is switched from the isolating position to the working position, the middle door is locked. When the isolating circuit breaker is switched from the working position to the isolating position, the middle door is unlocked so that the middle door can be opened. In this way, the middle door can be prevented from being opened when the isolating circuit breaker is in the working position, thereby preventing the operator from entering the energized interval.

[0036] The isolation operation limit assembly 20 is arranged in the operating mechanism 1000 near the operating contact 210 of the isolation motor 200, and can be blocked in the insertion channel between the isolation operation handle and the operating contact 210 when the middle door is opened, thereby limiting the plugging of the isolation operation handle and the operating contact 210. When the middle door is closed, the isolation operation handle can be pressed to release the insertion channel for the plugging of the isolation operation handle and the operating contact 210.

[0037] In one embodiment, the middle door locking assembly 10 includes a lock catch 11 and a lock rod 12, and both the lock catch 11 and the lock rod 12 are formed by processing metal plates.

[0038] The lock catch 11 is generally a U-shaped member, which is used to be fixed to the inner side of the middle door and defines an annular lock catch 11 structure with the middle door. Optionally, when the middle door is closed, the annular lock catch 11 structure is located above the operating mechanism 1000.

[0039] The locking rod 12 is arranged in the operating mechanism 1000, and the upper end of the locking rod 12 can be driven to rise from the top of the operating mechanism 1000 and pass through the annular lock buckle 11 structure, blocking the moving path of the lock buckle 11 when the middle door is opened to prevent the middle door from being opened, or the upper end of the locking rod 12 is driven to retract the operating mechanism 1000 and disengage from the annular lock buckle 11 structure.

[0040] Furthermore, the middle door locking assembly 10 also includes a connecting rod mechanism and a linkage plate 13. The connecting rod mechanism includes a connecting rod seat 14, a connecting rod shaft 15, a first connecting rod 16 and a second connecting rod 17. The connecting rod seat 14 is used to be fixed to the frame inside the operating mechanism 1000. The connecting rod shaft 15 is rotatably arranged in the connecting rod seat 14. One end of each of the first connecting rod 16 and the second connecting rod 17 is connected to the connecting rod shaft 15 respectively; the linkage plate 13 is connected to the other end of the first connecting rod 16, and the linkage plate 13 is also used to be connected to the working state switching device to slide horizontally with the working state switching of the isolating circuit breaker; the lower end of the locking rod 12 is connected to the other end of the second connecting rod 17.

[0041] It should be noted that, in the present embodiment, the linkage plate 13 moves left and right along the horizontal direction with the working state switching device. When the isolating circuit breaker is switched from the working position to the isolating position, the linkage plate 13 slides from left to right, and when the isolating circuit breaker is switched 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 the grounding function or the interlocking of the trolley. Since it does not belong to the key point of the present invention, it will not be elaborated in detail here.

[0042] In one embodiment, the connecting rod seat 14 includes a seat plate, a fixed 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 fixed plate 141 is provided with fixing holes for passing fixing parts (such as bolts) to fix to the frame. The pair of side plates 142 are provided with connecting rod shaft holes 1421. The connecting rod shaft 15 is passed through the pair of connecting rod shaft holes 1421 and the two ends are respectively passed through the side plates 142. The first connecting rod 16 and the second connecting rod 17 are connected to the part where the connecting rod shaft 15 passes through.

[0043] The working principle of the middle door locking assembly 10 of the present invention is:

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

[0045] In one embodiment, the isolation operation limit assembly 20 includes a limit rod 21 and a linkage crank 22. At least a portion of the limit rod 21 is horizontally arranged in front of the operating contact 210, and at least a portion of the structure can be pressed by the isolation operation handle to rotate away from the insertion channel when the middle door is closed; the linkage crank 22 includes an integrally formed abutting rod 221 and a contact pressure rod 222, the abutting rod 221 is pressed against one side of the limit rod 21, the upper end of the contact pressure rod 222 passes through the operating mechanism 1000 and can rotate under the push of the lock buckle 11 when the middle door is closed, so that the abutting rod 221 leaves the rotation path of the limit rod 21.

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

[0047] In one embodiment, an acute angle is defined between the pressing rod 221 and the contact pressure rod 222, and the size of the contact pressure rod 222 gradually decreases in the direction away from the connection portion of the pressing rod 221 and the contact pressure rod 222, thereby making the center of gravity of the linkage crank 22 lower, and after the pushing force on the contact pressure rod 222 is removed, it can automatically reset under the action of gravity and press against one side of the limit rod 21. Optionally, the linkage crank 22 is rotatably connected to the frame in the operating mechanism 1000 via a rotating shaft.

[0048] Furthermore, the isolation operation limit assembly 20 also includes a mounting seat 23, and the mounting seat 23 includes an integrally formed horizontal mounting plate 231 and a vertical fixing plate 232. The limit rod 21 is rotatably mounted on the horizontal mounting plate 231, and the vertical fixing plate 232 is used to be fixed to the frame of the operating mechanism 1000.

[0049] Furthermore, the isolation operation limit assembly 20 also includes a tension spring 24 and a connecting rod 25. The connecting rod 25 and the limit rod 21 are integrally formed in a manner having an 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 limit rod 21 to the front end of the operating contact 210 after the isolation operation handle is pulled out (that is, the pushing force of the operating handle on the limit rod 21 is cancelled).

[0050] In one embodiment, the connecting rod 25 is provided with a plurality of spring connection holes along its length direction; the transverse mounting plate comprises a rectangular body and an extension arm, the rectangular body is provided with a shaft mounting hole 2311 near the corner end, the limit rod 21 is installed on the transverse mounting plate 231 by inserting the shaft into the shaft mounting hole 2311, the extension arm is provided at a position of the rectangular body away from the shaft mounting hole, and a spring connection hole 2312 is provided at a position of the extension arm away from the rectangular body. The two ends of the tension spring 24 are respectively hooked on the spring connection holes 251 and 2312 of the connecting rod 25 and the extension arm. By providing a smaller extension arm on one side of the rectangular body instead of widening the rectangular body as a whole (using a large-sized rectangular plate), the weight of the mounting seat 23 can be reduced.

[0051] During the closing process of the middle door, the lock buckle 11 on the inner side of the middle door pushes the contact rod 222 of the linkage turning rod 22 to rotate clockwise, driving the pressing rod 221 to tilt upward and leave the rotation path of the limit rod 21, unlocking the rotation restriction of the limit rod 21, so that the isolation operating handle pushes the limit rod 21 to rotate out of 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 is reset under the action of the tension spring 24. When the middle door is opened, the linkage turning rod 22 is reset counterclockwise under the action of gravity, so that the pressing rod 221 is pressed against one side of the limit rod 21, locking the rotation path of the limit rod 21, and the isolation operating handle cannot be inserted, thus meeting the interlocking function requirements.

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

[0053] It can be understood that the box body of the operating mechanism 1000 is provided with a clearance hole corresponding to the lock rod 12 of the middle door locking assembly 10 and the linkage crank rod 22 of the isolation operation limit assembly 20, wherein a clearance hole corresponding to the linkage crank rod 22 extends along the insertion direction of the isolation operation handle (i.e., the front and rear direction of the box body), so that the contact pressure rod 222 of the linkage crank rod 22 can move forward and backward.

[0054] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features with similar functions invented in the present invention (but not limited to) to form a technical solution.

[0055] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, 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. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A middle door interlocking structure, suitable for being arranged in an isolating circuit breaker to realize the interlocking of the middle door of the isolating circuit breaker with the isolating operation, characterized in that: include: Middle door locking assembly and isolation operation limit assembly; The middle door locking assembly is used to work in conjunction with the working state switching device of the isolating circuit breaker to realize locking and unlocking of the middle door of the isolating circuit breaker. When the isolating circuit breaker is switched from the isolating position to the working position, the middle door is locked. When the isolating circuit breaker is switched from the working position to the isolating position, the middle door is unlocked so that the middle door can be opened. The isolation operation limit assembly is arranged in the operating mechanism of the isolation circuit breaker near the operating contact of the isolation motor, and can be blocked in the insertion channel between the isolation operation handle and the operating contact when the middle door is opened, thereby limiting the plugging of the isolation operation handle and the operating contact. When the middle door is closed, the insertion channel can be released under the pressure of the isolation operation handle for plugging of the isolation operation handle and the operating contact.

2. The middle door interlocking structure according to claim 1, characterized in that: The middle door locking assembly includes a lock catch and a lock rod; The lock catch is used to be fixed to the inner side of the middle door and defines an annular lock catch structure with the middle door, and the annular lock catch structure is located above the operating mechanism; The locking rod is arranged in the operating mechanism, and the locking rod can be driven to rise and extend from the top of the operating mechanism to penetrate the annular locking structure, or retract the operating mechanism to separate from the annular locking structure.

3. The middle door interlocking structure according to claim 2, characterized in that: The middle door locking assembly also includes a connecting rod mechanism and a linkage plate; The connecting rod mechanism comprises a connecting rod seat, a connecting rod shaft, a first connecting rod and a second connecting rod, wherein the connecting rod seat is used to be fixed to a frame inside the operating mechanism, the connecting rod shaft is rotatably arranged in the connecting rod seat, and one end of each of the first connecting rod and the second connecting rod is connected to the connecting rod shaft respectively; The linkage plate is connected to the other end of the first connecting rod, and the linkage plate is also used to be connected 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 middle door interlocking structure 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 upward, and a pair of side plates formed by bending both sides of the seat plate upward. The fixing plate is provided with a fixing hole for passing a fixing part to fix to the frame. The pair of side plates are each provided with a connecting rod shaft hole. The connecting rod shaft is passed through the pair of connecting rod shaft holes and the two ends are respectively passed through the side plates. The first connecting rod and the second connecting rod are connected to the position where the connecting rod shaft passes through.

5. The middle door interlocking structure according to claim 1, characterized in that: The isolation operation limit assembly includes a limit rod and a linkage crank rod; At least a portion of the structure of the limit rod is horizontally arranged in front of the operating contact, and at least a portion of the structure can be pressed by the isolation operating handle to rotate away from the insertion channel when the middle door is closed; The linkage crank rod includes an integrally formed pressing rod and a contact pressure rod. The pressing rod is pressed against one side of the limiting rod. The upper end of the contact pressure rod passes through the operating mechanism and can make the pressing rod leave the rotation path of the limiting rod under the push of the lock.

6. The middle door interlocking structure according to claim 5, characterized in that: An acute angle is defined between the abutting rod and the contact pressure rod, and a size of the contact pressure rod gradually decreases in a direction away from a connection portion between the abutting rod and the contact pressure rod.

7. The middle door interlocking structure according to claim 5, characterized in that: The isolation operation limit assembly also includes a mounting seat, which includes an integrally formed transverse mounting plate and a vertical fixing plate. The limit rod is rotatably mounted on the transverse mounting plate, and the vertical fixing plate is used to be fixed to the frame of the operating mechanism.

8. The middle door interlocking structure according to claim 7, characterized in that: The isolation operation limit assembly further comprises a tension spring and a connecting rod. The connecting rod and the limit rod are integrally formed in a manner of having an included angle. The two ends of the tension spring are respectively connected to the transverse mounting plate and the connecting rod.

9. The middle door interlocking structure according to claim 8, characterized in that: The connecting rod is provided with a plurality of spring connecting holes along its length direction; The transverse mounting plate comprises a rectangular body and an extension arm, the rectangular body is provided with a shaft mounting hole near a corner end, the limit rod is installed on the transverse mounting plate by inserting the shaft into the shaft mounting hole, the extension arm is provided at a position of the rectangular body away from the shaft mounting hole, and a spring connection hole is provided at a position of the extension arm away from the rectangular body; The two ends of the tension spring are respectively hooked on the spring connecting holes of the connecting rod and the extension arm.

10. An isolating circuit breaker, comprising a cabinet, a trolley pluggably arranged in the cabinet, and a middle door connected to the cabinet in an openable and closable manner and arranged at a position corresponding to the trolley, the trolley comprising a trolley frame and three-phase poles and an operating mechanism all arranged on the trolley frame, the operating mechanism being used to switch the working state of the three-phase poles, the operating mechanism comprising a box, a frame arranged in the box, an isolating motor fixed on the frame, and a working state switching device, the isolating motor having an operating contact, the operating contact being used to operate the isolation of the isolating switch under the action of an isolating operating handle, characterized in that, It also includes a middle door interlocking structure as described in 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 isolation operation limit component limits the docking of the isolation operation handle and the operating contact or releases the restriction on the insertion channel of the isolation operation handle according to the opening and closing state of the middle door.

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