Isolation circuit breaker interlocking structure and high-voltage switch cabinet

Abstract

The utility model provides an isolation circuit breaker interlocking structure and a high-voltage switch cabinet. The interlocking structure comprises a connecting rod mechanism, a linkage plate, a middle door lock catch, a middle door limiting rod, a handcart limiting rod and a limiting baffle plate, the linkage plate, the middle door limiting rod, the handcart limiting rod and the limiting baffle are connected through the linkage mechanism, and the linkage plate is linked with the working state of the isolation circuit breaker to drive the middle door limiting rod, the handcart limiting rod and the limiting baffle to correspondingly achieve interlocking and unlocking of the middle door, the handcart and the grounding switch. According to the interlocking structure, due to the fact that various interlocks are tightly connected, the interlocking structure is simple and compact in structure, convenient to operate and safer and more reliable in performance.

Description

Technical Field

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

[0002] High-voltage switchgear should have extremely high safety and anti-misoperation functions to avoid personal injury and material loss. Therefore, switchgear should have a complete anti-misoperation mechanical interlocking device: that is, it should have the "five protections" function, namely, preventing accidental opening and closing of circuit breakers, preventing opening and closing of disconnecting switches with charge, preventing power supply with grounding, preventing grounding with power on, and preventing accidental entry into energized compartments, so as to effectively prevent the occurrence of electrical misoperation accidents.

[0003] In traditional high-voltage electrical switchgear, the interlocking structures for the five protection functions are set up separately, resulting in a complex internal structure of the isolating circuit breaker with many parts and a relatively large size. Utility Model Content

[0004] The purpose of this utility model is to provide a simple, easy-to-operate, and safe and reliable circuit breaker interlocking structure and a high-voltage switchgear using this interlocking structure.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] In a first aspect, this utility model provides an interlocking structure for an isolating circuit breaker, including a linkage mechanism, a linkage plate, a middle door latch, a middle door limit rod, a handcart limit rod, and a limit baffle. The linkage mechanism includes a linkage seat fixed to a frame within the operating mechanism of the isolating circuit breaker, a linkage shaft rotatably disposed on the linkage seat, and a first link and a second link connected to both ends of the linkage shaft. The linkage plate is connected to one end of the first link and configured to slide horizontally as the isolating circuit breaker switches between the working position and the isolating position. The middle door latch is installed inside the middle door. The middle door limit rod is connected to one end of the second link and can extend into the middle door latch when the isolating circuit breaker is in the working position and into the middle door latch when the isolating circuit breaker is in the isolating position. The system allows the middle door latch to move outward; the handcart limit rod is connected to the other end of the second link and can move downward into the preset limit notch on the handcart lock rod when the isolating circuit breaker is in the working position, and move upward to be pulled out from the limit notch when the isolating circuit breaker is in the isolation position; the grounding switch operation blocking shaft is used to connect to the grounding switch to operate the opening and closing of the grounding switch under the action of the grounding operation handle, and is configured to move in the vertical direction; the limit baffle is connected to the other end of the first link and is configured to slide in the horizontal direction, blocking the grounding switch operation blocking shaft above when the isolating circuit breaker is in the working position, and allowing the grounding switch operation blocking shaft to move upward when the isolating circuit breaker is in the isolation position.

[0007] In one embodiment, the connecting rod seat includes a seat plate, a fixing plate formed by bending one end of the seat plate upward, a pair of side plates formed by bending both sides of the seat plate upward, and a limiting plate formed by bending the other end of the seat plate laterally; the pair of side plates are provided with shaft holes, and the connecting rod shaft passes through the shaft holes; the limiting plate is provided with limiting holes, and the upper end of the handcart limiting rod passes through the limiting holes.

[0008] In one embodiment, the interlocking structure further includes a support plate for fixing to the frame, the support plate having a clearance hole, and the end of the limiting baffle away from the first connecting rod is placed in the clearance hole and can pass through the clearance hole.

[0009] In one embodiment, both the linkage plate and the limiting baffle are provided with waist-shaped holes, which extend along the width direction of the plate. The linkage plate and the limiting baffle are connected to the first connecting rod through their respective waist-shaped holes.

[0010] In one embodiment, the interlocking structure further includes an isolation operation limiting component, which includes a horizontally rotatable limiting arm positioned in front of the operating contact on the isolation motor of the isolating circuit breaker. The limiting arm is configured to rotatably allow the isolating operating handle to engage with the operating contact when the isolating circuit breaker is in the isolation position, under the pushing action of the isolating operating handle, and to prevent the isolating operating handle from entering the engagement position when the isolating circuit breaker is in the working position.

[0011] In one embodiment, the isolation operation limiting assembly further includes a mounting base and a return spring. The mounting base is used to fix to the frame of the operating mechanism, the limiting arm is rotatably mounted on the mounting base, and the return spring is used to reset the limiting arm to lie horizontally in front of the operating contact when the force exerted by the isolation operation handle on the limiting arm is removed.

[0012] In one embodiment, the isolation operation limiting assembly further includes an auxiliary arm connected at an angle to the limiting arm, and the reset spring is a tension spring with its two ends connected to the mounting base and the auxiliary arm, respectively. The interlocking structure further includes a grounding switch linkage rod, which is configured to move up and down with the opening and closing of the grounding switch. A stop plate is fixed at the top of the grounding switch linkage rod. The stop plate can move upward to block the rotation path of the auxiliary arm when the grounding switch is closed, and move downward to allow the rotation path of the auxiliary arm when the grounding switch is opened.

[0013] In one embodiment, the isolation operation limiting assembly further includes a crank arm, which includes a clamping rod and a linkage contact rod. The clamping rod abuts against one side of the limiting arm, one end of the linkage contact rod is connected to the clamping rod, and the other end of the linkage contact rod extends through the operating mechanism during installation and can be pushed by the middle door latch when the middle door is closed, so that the clamping rod rotates away from the rotation path of the limiting arm.

[0014] In one embodiment, the angle between the linkage rod and the clamping rod is an acute angle, and the crank arm is also provided with a counterweight at the connection position between the linkage rod and the clamping rod, and the linkage rod gradually shrinks in the direction away from the counterweight.

[0015] As a second aspect, this utility model also provides a high-voltage switchgear, including a cabinet, an isolating circuit breaker, a middle door, a grounding switch, and the aforementioned isolating circuit breaker interlocking structure. The isolating circuit breaker is provided with an operating mechanism, which includes a housing, a frame housed within the housing, an isolating motor fixed to the frame, and a retractable locking rod housed within the housing. When extended, the locking rod can be stopped inside the cabinet. The connecting rod seat is fixed to the frame. The linkage plate and the limiting baffle are both inserted through the frame. The middle door latch is fixed to the inside of the middle door.

[0016] The beneficial effects of the technical solution provided by this utility model are:

[0017] 1. The interlocking structure of the isolating circuit breaker of this utility model connects the linkage plate, the middle door limit rod, the handcart limit rod, and the limit baffle through a linkage mechanism. The linkage plate is linked with the working state of the isolating circuit breaker, thereby driving the middle door limit rod, the handcart limit rod, and the limit baffle to realize the interlocking and unlocking of the middle door, the handcart, and the grounding switch. This achieves the linkage between the working state of the middle door, the handcart, and the grounding switch and the isolating circuit breaker. The interlocking structure of this utility model is simple and compact in structure, easy to operate, and safer and more reliable in performance because the various interlocks are closely connected.

[0018] 2. The interlocking structure of the isolating circuit breaker of this utility model is also equipped with an isolating operation limit structure, which is interlocked with the opening and closing of the intermediate door and the opening and closing of the grounding switch. This ensures that the isolating circuit breaker can only be operated in the isolating position and when the grounding switch is open, which further improves the operational safety of the high-voltage switchgear, prevents misoperation, and avoids equipment damage. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the interlocking structure of the isolating circuit breaker in the working position according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 The diagram shows the interlocking structure of the isolating circuit breaker in the isolating position.

[0022] Figure 3 This is a schematic diagram of the linkage mechanism provided in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a connecting rod seat provided in one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of a linkage plate provided in one embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of the structure of a limiting baffle provided in one embodiment of the present utility model;

[0026] Figure 7 This is a schematic diagram of the structure of a support plate provided in one embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of a limiting fork provided in one embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the linkage contact rod provided in one embodiment of the present utility model;

[0029] Figure 10 This is a schematic diagram of the structure of a mounting base provided in one embodiment of the present utility model;

[0030] Figure 11 This is a schematic diagram of the interlocking structure between the operating mechanism and the grounding switch linkage assembly provided in one embodiment of the present utility model;

[0031] Figure 12 for Figure 11 The diagram shows another state of the interlocking structure. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] See Figures 1 to 10 and combined Figure 11 and Figure 12 This utility model relates to an interlocking structure for an isolating circuit breaker (hereinafter referred to as "interlocking structure"), which is used in a high-voltage switchgear to realize the interlocking function between the isolating circuit breaker and the cabinet, intermediate door and grounding switch of the high-voltage switchgear, so as to avoid misoperation and improve operational safety.

[0037] It should be understood that the disconnecting circuit breaker of this utility model includes a handcart frame and three-phase poles and an operating mechanism, all mounted on the handcart frame. The three-phase poles, operating mechanism, and handcart frame constitute a pluggable disconnecting circuit breaker. The operating mechanism is used to switch the working state of the three-phase poles, that is, to place the three-phase poles of the disconnecting circuit breaker in the working position or the isolated position. The operating mechanism is equipped with an isolation motor, which has operating contacts for operating the isolation by inserting the isolation operating handle into the operating contacts. Correspondingly, the high-voltage switchgear, in addition to the disconnecting circuit breaker, also includes a cabinet, a grounding switch, and a current transformer. The disconnecting circuit breaker is pluggably installed inside the cabinet, and the cabinet is equipped with a central door corresponding to the disconnecting circuit breaker for protection.

[0038] The interlocking structure of this utility model is mainly used to realize the interlocking functions of the middle door, the handcart, the grounding switch, and the isolation operation interlocking function. The realization of each interlocking function is related to the working state of the isolation circuit breaker to improve operational safety.

[0039] See Figure 1Specifically, the interlocking structure 100 mainly includes the following components: linkage mechanism 10, linkage plate 20, grounding operation stop assembly 60, grounding switch linkage assembly 50, middle door locking assembly 30, and handcart limit rod 40.

[0040] Please combine Figure 3 The linkage mechanism 10 includes a linkage seat 11, a linkage shaft 12, a first linkage 13, and a second linkage 14. The linkage seat 11 is used to be installed on the frame 500 inside the operating mechanism 1000. The linkage shaft 12 is rotatably passed through the linkage seat 11. The first linkage 13 and the second linkage 14 are connected to the two ends of the linkage shaft 12. Preferably, the middle part of the first linkage 13 and the second linkage 14 is connected to the linkage shaft 12.

[0041] The linkage plate 20 is connected to one end of the first link 13. The linkage plate 20 is also used to link with the working state of the isolation circuit breaker. It slides horizontally when the isolation circuit breaker switches between the working position and the isolation position. In this embodiment, the linkage plate 20 slides in the left and right direction.

[0042] The middle door locking assembly 30 includes a middle door latch 31 and a middle door limiting rod 32 that can be inserted into the middle door latch 31.

[0043] The middle door latch 31 is used to fix it to the inside of the middle door. The middle door latch 31 is generally U-shaped and is fixed to the middle door with its open end facing the middle door.

[0044] The middle door limiting rod 32 is connected to one end of the second link 14 and is configured to move in the vertical direction. When the isolating circuit breaker is switched from the isolating position to the working position, the middle door limiting rod 32 moves upward and can pass into the middle door latch 31, blocking the movement path of the middle door latch 31 during the opening of the middle door and preventing the middle door from being opened. When the isolating circuit breaker is switched from the working position to the isolating position, the middle door limiting rod 32 moves downward and disengages from the middle door latch 31, allowing the middle door latch 31 to move outward, and the middle door can be opened.

[0045] The handcart limiting rod 40 is connected to the other end of the second link 14 and is configured to move in the vertical direction. It is understood that since the handcart limiting rod 40 and the middle door limiting rod 32 are connected to both ends of the second link 14, the moving direction of the handcart limiting rod 40 is opposite to that of the middle door limiting rod 32. When the handcart limiting rod 40 moves downwards to a predetermined distance, it inserts into a preset limiting notch on the handcart locking rod 300, restricting the handcart locking rod 300 from retracting inwards, preventing the handcart from being pulled out of the cabinet. When the handcart limiting rod 40 moves upwards and is pulled out of the limiting notch, the restriction of the handcart locking rod 300 is released, and the handcart can be pulled out of the cabinet.

[0046] The grounding switch linkage assembly 50 includes the grounding switch operation blocking shaft 51, which is connected to the grounding switch to operate the grounding switch opening and closing under the action of the grounding operation handle, and is configured to be movable in the vertical direction.

[0047] The grounding operation blocking assembly 60 includes a limiting baffle 61 connected to the other end of the first link 13 and configured to slide horizontally. When the isolating circuit breaker is in the operating position, it blocks the grounding switch operation blocking shaft 51 above it; when the isolating circuit breaker is in the isolation position, it allows the grounding switch operation blocking shaft 51 to move upwards. It is understood that since the limiting baffle 61 and the linkage plate 20 are connected to both ends of the first link 13, the sliding direction of the limiting baffle is opposite to the sliding direction of the linkage plate 20. That is, when the linkage plate 20 slides from left to right, the limiting baffle slides from right to left; conversely, when the linkage plate 20 slides from right to left, the limiting baffle slides from left to right.

[0048] Understandably, in this embodiment, the rotation of the connecting rod is converted into linear movement of the limiting baffle, the middle door limiting rod 32, and the handcart limiting rod 40 by necessary limiting components.

[0049] The linkage plate 20 and the limiting baffle 61 are both installed in the frame 500 of the operating mechanism 1000, thereby restricting its sliding in the left and right directions. The top end of the middle door limiting rod 32 is installed in the top end of the box of the operating mechanism 1000, and the handcart limiting rod 40 passes through the limiting hole 1141 preset on the connecting rod seat 11 to limit the movement of the middle door limiting rod 32 and the handcart limiting rod 40 in the up and down directions.

[0050] The working principle of the interlocking structure 100 of this utility model is as follows:

[0051] Please combine Figure 1 and Figure 12 When the isolating circuit breaker is in the working position, the linkage plate 20 is located at its leftmost position, the upper end of the middle door limit rod 32 is at its highest position and is inserted into the middle door latch 31, the lower end of the handcart limit rod 40 is at its lowest position and is inserted into the limit notch of the handcart lock rod 300, and the limit baffle is located at its rightmost position and blocks the grounding switch operation blocking shaft 51.

[0052] Please combine Figure 2 and Figure 11When the isolating circuit breaker switches from the working position to the isolating position, the linkage plate 20 slides from left to right, causing the first linkage 13 to rotate clockwise. Under the action of the first linkage 13, the limit baffle moves from right to left, making way for the grounding switch operation blocking shaft 51 to move upward. The grounding operation handle can be inserted to operate the opening and closing of the grounding switch. The second linkage 14 rotates clockwise under the action of the first linkage 13, thereby causing the middle door limit rod 32 to move downward and the handcart limit rod 40 to move upward, thereby releasing the locking of the middle door and the handcart, allowing the middle door to be opened and the handcart to be pulled out from the high-voltage switch cabinet.

[0053] Conversely, when the isolating circuit breaker switches from the isolating position to the working position, the linkage plate 20 slides from right to left, causing the first linkage 13 to rotate counterclockwise. Under the action of the first linkage 13, the limit baffle 61 moves from left to right, moving above the grounding switch operation blocking shaft 51 to restrict the upward movement of the grounding switch operation blocking shaft 51. At this time, the grounding operation handle cannot be inserted to operate the opening and closing of the grounding switch. The second linkage 14 rotates counterclockwise under the action of the first linkage 13, thereby causing the middle door limit rod 32 to move upward and the handcart limit rod 40 to move downward, thus completing the locking of the middle door and the handcart, so that the middle door cannot be opened and the handcart cannot be pulled out from the high-voltage switch cabinet.

[0054] As can be seen from the above, the interlocking structure 100 of this utility model connects the linkage plate 20, the middle door limit rod 32, the handcart limit rod 40, and the limit baffle 61 by setting the linkage mechanism 10. The linkage plate 20 is linked with the working state of the isolating circuit breaker, which drives the middle door limit rod 32, the handcart limit rod 40, and the limit baffle to realize the interlocking and unlocking of the middle door, the handcart, and the grounding switch, thereby realizing the linkage between the working state of the middle door, the handcart, the grounding switch, and the isolating circuit breaker. Since the various interlocks are closely connected, the interlocking structure 100 of this utility model is simple and compact, easy to operate, and safer and more reliable.

[0055] Please combine Figure 4 In one embodiment, the connecting rod seat 11 includes a seat plate 110, a fixing plate formed by bending one end of the seat plate 110 upwards, a pair of side plates 112 formed by bending both sides of the seat plate 110 upwards, and a limiting plate 114 formed by bending the other end of the seat plate 110 laterally. The fixing plate is used to install onto the frame 500. The pair of side plates 112 have shaft holes, through which the connecting rod shaft 12 passes. The limiting plate 114 has the aforementioned limiting hole 1141, through which the upper end of the handcart limiting rod 40 passes, thereby limiting the movement trajectory of the handcart limiting rod 40 and converting rotation into vertical movement.

[0056] Please combine Figure 7 and Figure 11In one embodiment, the grounding operation blocking assembly 60 further includes a support plate 62 for fixing to the frame 500. The support plate 62 includes a main body 621 and a fixing part 622. The fixing part 622 is formed by bending both ends of the main body 621 and is used to fix to the frame 500. The main body 621 has a clearance hole 6211. The end of the limiting baffle 61 away from the first connecting rod 13 is placed in the clearance hole and can pass through the clearance hole. Preferably, the limiting baffle 61 is bent to form a blocking part 611. The blocking part blocks above the linkage rod 52, increasing the lateral dimension of the blocking part, ensuring the blocking effect, and further improving the reliability of the equipment.

[0057] Please combine Figure 5 and Figure 6 In one embodiment, both the linkage plate 20 and the limiting baffle 61 are provided with waist-shaped holes 21 and 612. The waist-shaped holes 21 and 612 serve as connecting holes and extend along the width direction of the plate (i.e., the height direction of the isolating circuit breaker). The linkage plate 20 and the limiting baffle 61 are connected to the first connecting rod 13 through their respective waist-shaped holes, thereby facilitating the assembly of the linkage plate 20 and the limiting baffle with the connecting rod mechanism 10.

[0058] Furthermore, the interlocking structure 100 also includes an isolation operation limit component 70, which is used to realize the linkage between the isolation operation and the opening and closing of the intermediate door and the opening and closing of the grounding switch. Isolation can only be operated when the intermediate door is closed and the grounding switch is open, so as to avoid misoperation, further improve the operation safety of the high-voltage switchgear, avoid damage to the equipment due to misoperation, and also avoid the risk of electric shock to the operator.

[0059] Please combine Figures 8-10 The isolation operation limiting assembly 70 includes a horizontally rotatable limiting arm 711, which is positioned horizontally in front of the operating contact 210 on the isolation motor 200 of the isolation circuit breaker. The limiting arm 711 is configured to allow the isolation operating handle to rotate and make way for the docking position between the isolation operating handle and the operating contact 210 when the isolation circuit breaker is in the isolation position, and to prevent the isolation operating handle from entering the docking position when the isolation circuit breaker is in the working position.

[0060] In one embodiment, the isolation operation limiting assembly 70 further includes a mounting base 73 and a return spring (not shown, the same below). The mounting base 73 is used to fix to the frame 500 of the operating mechanism 1000. The limiting arm 711 is rotatably mounted on the mounting base 73. The return spring is used to reset the limiting arm 711 to lie horizontally in front of the operating contact 210 when the force exerted by the isolation operation handle on the limiting arm 711 is removed.

[0061] In one embodiment, the isolation operation limiting assembly 70 further includes an auxiliary arm 712 connected at an angle to the limiting arm 711. The reset spring is a tension spring, with its two ends connected to the mounting base 73 and the auxiliary arm 712, respectively. The interlocking structure 100 also includes a grounding switch linkage rod 52, which is configured to move up and down with the opening and closing of the grounding switch. A stop plate 53 is fixed at the top of the grounding switch linkage rod 52. The stop plate 53 can move upward to block the rotation path of the auxiliary arm 712 when the grounding switch is closed, and move downward to allow the rotation path of the auxiliary arm 712 when the grounding switch is opened.

[0062] The interlocking process between the above isolation operation and the opening / closing of the middle door and the grounding switch is as follows:

[0063] When the middle door is open, the clamping rod 722 abuts against the limiting arm 711, restricting its rotation. At this time, the isolation operating handle cannot be inserted to operate the isolation motor 200. During the closing process of the middle door, the middle door latch 31 on the inner side of the middle door moves inward, pushing the linkage contact rod 721 to extend to one end of the operating mechanism 1000, causing the linkage contact rod 721 to rotate clockwise. The clamping rod 722 tilts upward and gradually moves away from the rotation path of the limiting arm 711. When the middle door is fully closed, the isolation operating handle can be inserted to operate the isolation motor 200 for isolation operation. When the middle door is opened, the middle door latch 31 moves outward, the force on the linkage contact rod 721 is removed, the crank arm 72 returns to its original position under its own gravity, and the clamping rod 722 abuts against the limiting rod.

[0064] When the grounding switch is closed, the grounding switch linkage rod 52 moves upward so that its stop plate 53 is located within the rotation path of the auxiliary arm 712, and the auxiliary arm 712 cannot rotate. At this time, the isolation operation handle cannot be inserted to operate the isolation. When the grounding switch is open, the grounding switch linkage rod 52 moves downward so that its stop plate 53 is located below the auxiliary arm 712, making room for the rotation path of the auxiliary arm 712. At this time, the isolation operation handle can be inserted to operate the isolation.

[0065] The limiting arm 711 and the auxiliary arm 712 are integrally formed, and the included angle between them is an obtuse angle, forming a fork-shaped limiting member 71, which can rotate synchronously.

[0066] In one embodiment, the mounting base 73 includes a mounting plate 731, a fixing plate 732 formed by bending the mounting plate 731 downward, and an extension arm 733 connected to one side of the mounting plate 731. The mounting plate 731 has a connecting shaft hole 7311 for mounting a connecting shaft. The fixing plate is used to fix it to the frame 500. The extension arm 733 has a spring connecting hole.

[0067] The fork-shaped limiting member 71 is rotatably mounted on the mounting plate 731 by inserting a connecting shaft into the connecting shaft hole 7311. The auxiliary arm 712 has multiple spring connecting holes 7121 along its length, and the two ends of the tension spring are hooked into the spring connecting holes of the extension arm 733 and the auxiliary arm 712, respectively. By providing multiple spring connecting holes 7121 on the auxiliary arm 712, the tension spring can be hooked into the corresponding spring connecting hole 7121 according to the required elastic force, thereby adjusting the elastic force of the return spring and ensuring that the limiting arm 711 can accurately return to its original position.

[0068] In one embodiment, the isolation operation limiting assembly 70 further includes a crank arm 72, which includes a clamping rod 722 and a linkage contact rod 721. The clamping rod 722 abuts against one side of the limiting arm 711. One end of the linkage contact rod 721 is connected to the clamping rod 722. The other end of the linkage contact rod 721 extends through the operating mechanism 1000 during installation and can be pushed by the middle door latch 31 when the middle door is closed, so that the clamping rod 722 rotates away from the rotation path of the limiting arm 711.

[0069] In one embodiment, the angle between the linkage rod 721 and the clamping rod 722 is an acute angle. The crank arm 72 is also provided with a counterweight at the connection position between the linkage rod 721 and the clamping rod 722. The linkage rod 721 gradually shrinks in the direction away from the counterweight, so that the center of gravity of the crank arm 72 is lower. After the force applied to the linkage rod 721 is removed, it automatically returns to its original position under the action of gravity, so that the clamping rod 722 abuts against the limiting arm 711, preventing the isolation operating handle from entering the docking position between it and the operating contact 210.

[0070] It should be noted that in the isolation operation limiting assembly 70 of this utility model, the fork-shaped limiting member 71 rotates in the horizontal direction and the crank arm 72 rotates in the vertical direction. The interlocking of the isolation operation is achieved through the rotation in two directions, making full use of the internal space of the operating mechanism 1000 and making the structure of the isolation circuit breaker more compact.

[0071] 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.

[0072] 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 circuit breaker interlocking structure for realizing interlocking between the circuit breaker and the cabinet, grounding switch, and intermediate door of a high-voltage switchgear, characterized in that, include: The linkage mechanism includes a linkage seat on a frame for fixing to an operating mechanism in an isolating circuit breaker, a linkage shaft rotatably disposed on the linkage seat, and a first linkage and a second linkage connected to both ends of the linkage shaft; The linkage plate is connected to one end of the first linkage and is configured to slide horizontally as the isolating circuit breaker switches between the working position and the isolating position; The middle door latch is used to install on the inside of the middle door; The middle door limit rod is connected to one end of the second link and can extend into the middle door latch when the isolating circuit breaker is in the working position, and allow the middle door latch to move outward when the isolating circuit breaker is in the isolation position. The handcart limit rod is connected to the other end of the second link and can move downwards into the preset limit notch on the handcart lock rod when the isolating circuit breaker is in the working position, and move upwards to be pulled out from the limit notch when the isolating circuit breaker is in the isolation position. The grounding switch operating blocking shaft is used to connect to the grounding switch to operate the grounding switch opening and closing under the action of the grounding operating handle, and is configured to be movable in the vertical direction. A limit baffle, connected to the other end of the first link, is configured to slide horizontally, blocking the grounding switch operating blocking shaft above the circuit breaker when the isolating circuit breaker is in the working position, and allowing the grounding switch operating blocking shaft to move upward when the isolating circuit breaker is in the isolation position.

2. The interlocking structure for the isolating circuit breaker according to claim 1, characterized in that, The connecting rod seat includes a seat plate, a fixing plate formed by bending one end of the seat plate upward, a pair of side plates formed by bending both sides of the seat plate upward, and a limiting plate formed by bending the other end of the seat plate laterally. The pair of side plates are provided with shaft holes, and the connecting rod shaft passes through the shaft holes; The limiting plate has a limiting hole, and the upper end of the handcart limiting rod passes through the limiting hole.

3. The interlocking structure for the isolating circuit breaker according to claim 1, characterized in that, It also includes a support plate for fixing to the frame, the support plate having a clearance hole, and the end of the limiting baffle away from the first connecting rod is placed in the clearance hole and can pass through the clearance hole.

4. The interlocking structure for the isolating circuit breaker according to claim 1, characterized in that, Both the linkage plate and the limiting baffle are provided with waist-shaped holes, which extend along the width direction of the plate. The linkage plate and the limiting baffle are connected to the first connecting rod through their respective waist-shaped holes.

5. The interlocking structure for the isolating circuit breaker according to claim 1, characterized in that, It also includes an isolation operation limit assembly, which includes a horizontally rotatable limit arm positioned in front of the operating contact on the isolation motor of the isolating circuit breaker and configured to rotatably allow the isolating operation handle to engage with the operating contact when the isolating circuit breaker is in the isolation position, and to prevent the isolating operation handle from entering the engagement position when the isolating circuit breaker is in the working position.

6. The interlocking structure for the isolating circuit breaker according to claim 5, characterized in that, The isolation operation limit assembly also includes a mounting base and a return spring. The mounting base is used to fix it to the frame of the operating mechanism. The limit arm is rotatably mounted on the mounting base. The return spring is used to reset the limit arm to lie horizontally in front of the operating contact when the force exerted by the isolation operation handle on the limit arm is removed.

7. The interlocking structure for the isolating circuit breaker according to claim 6, characterized in that, The isolation operation limiting assembly also includes an auxiliary arm connected at an angle to the limiting arm, and the reset spring is a tension spring, with its two ends connected to the mounting base and the auxiliary arm, respectively. It also includes a grounding switch linkage rod, which is configured to move up and down with the opening and closing of the grounding switch. A stop plate is fixed at the top of the grounding switch linkage rod. The stop plate can move up to block the rotation path of the auxiliary arm when the grounding switch is closed, and move down to allow the rotation path of the auxiliary arm when the grounding switch is opened.

8. The interlocking structure for the isolating circuit breaker according to claim 5, characterized in that, The isolation operation limiting assembly also includes a crank arm, which includes a clamping rod and a linkage contact rod. The clamping rod abuts against one side of the limiting arm, and one end of the linkage contact rod is connected to the clamping rod. The other end of the linkage contact rod extends through the operating mechanism during installation and can be pushed by the middle door latch when the middle door is closed, so that the clamping rod rotates away from the rotation path of the limiting arm.

9. The interlocking structure for the isolating circuit breaker according to claim 8, characterized in that, The angle between the linkage contact rod and the clamping rod is an acute angle. The crank arm is also provided with a counterweight at the connection position between the linkage contact rod and the clamping rod. The linkage contact rod gradually shrinks in the direction away from the counterweight.

10. A high-voltage switchgear, comprising a cabinet, an isolating circuit breaker, an intermediate door, and a grounding switch, wherein the isolating circuit breaker is provided with an operating mechanism, the operating mechanism comprising a housing, a frame disposed within the housing, an isolating motor fixed to the frame, and a retractable locking rod disposed within the housing, wherein the locking rod, when extended, can stop inside the cabinet, characterized in that, It also includes the isolation circuit breaker interlocking structure according to any one of claims 1 to 9, wherein the connecting rod seat is fixed on the frame, the linkage plate and the limiting baffle are both inserted through the frame, and the middle door latch is fixed on the inner side of the middle door.

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