Isolation operation handle limiting mechanism and isolation circuit breaker

Abstract

The utility model provides an isolation operation handle limiting mechanism which is used for being arranged in an operation mechanism of an isolation circuit breaker and is arranged close to an operation contact of a positive and negative rotation motor of the operation mechanism, and the limiting mechanism comprises a limiting fork and a crank arm, the limiting fork comprises a blocking arm, and at least part of the structure of the blocking arm is rotatably and transversely arranged in front of the operating contact; the crank arm comprises a feeler lever and an abutting arm which are connected with each other, the feeler lever is used for receiving an external touch effect, the abutting arm abuts against one side of the blocking arm and is used for limiting rotation of the blocking arm so as to prevent the isolation operation handle from entering a butt joint position between the isolation operation handle and the operation contact, and the abutting arm can be rotationally separated from the blocking arm when the feeler lever is subjected to the touch effect. The blocking arm can be exposed out of the butt joint position in a rotating mode under the action force of insertion of the isolation operation handle. Therefore, the isolation switch is prevented from being operated when the middle door is opened, the isolation operation safety is improved, and the problem of electric shock is avoided.

Description

Technical Field

[0001] This utility model relates to the field of high voltage switchgear technology, and more specifically, to an isolation operating handle limit mechanism and an isolation circuit breaker. Background Technology

[0002] The rotary disconnect circuit breaker integrates a high-voltage circuit breaker and a high-voltage disconnect 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 isolation operating mechanism to achieve the isolation function by rotating the three-phase poles longitudinally. To prevent operator error and electric shock, and to improve the safety of isolation operation, the rotary disconnect circuit breaker is equipped with an interlocking device. The disconnect switch can only be operated when the intermediate door (the door corresponding to the trolley position) of the rotary disconnect circuit breaker is closed. Specifically, the isolation operating handle can only be inserted and connected to the operating contacts on the forward and reverse motors after the intermediate door is closed, controlling the forward and reverse motors for isolation function control. Currently, the interlocking device structure in the rotary disconnect 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 an isolation operating handle limiting mechanism with a simple structure and reduced installation space, as well as an isolation circuit breaker using the isolation operating handle limiting mechanism.

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

[0005] This utility model provides an isolation operating handle limiting mechanism for being installed in the operating mechanism of an isolation circuit breaker and located near the operating contacts of the forward and reverse motor of the operating mechanism. The limiting mechanism includes a limiting fork and a crank arm. The limiting fork includes a stop arm, at least a portion of which is rotatably positioned horizontally in front of the operating contact. The crank arm includes a contact rod and a clamping arm connected to each other. The contact rod receives external pressure, and the clamping arm abuts against one side of the stop arm to limit the rotation of the stop arm and prevent the isolation operating handle from entering the mating position between itself and the operating contact. The clamping arm can rotate and separate from the stop arm when the contact rod is subjected to pressure, so that the stop arm can rotate and expose the mating position when subjected to the insertion force of the isolation operating handle.

[0006] In one embodiment, the stop arm rotates horizontally and the crank arm rotates vertically.

[0007] In one embodiment, the limiting fork further includes a connecting arm, which is connected to the stop arm at an angle; the isolation operating handle limiting mechanism further includes a return spring, which is connected to the connecting arm and is used to reset the stop arm horizontally in front of the operating contact when the force exerted by the isolation operating handle on the stop arm is removed.

[0008] In one embodiment, the isolation operating handle limiting mechanism further includes a mounting base for connecting to a bracket within the operating mechanism; the limiting fork is rotatably mounted on the mounting base, and the return spring is a tension spring, with one end connected to the connecting arm and the other end connected to the mounting base.

[0009] In one embodiment, the mounting base includes a horizontal mounting plate and a vertical mounting plate formed by bending the horizontal mounting plate downwards. The horizontal mounting plate has a pivot hole, and the vertical mounting plate has a screw hole. The limiting fork is rotatably mounted on the horizontal mounting plate by inserting a pivot into the pivot hole. The vertical mounting plate is used to fix the bracket with screws through the screw holes.

[0010] In one embodiment, the connecting arm has a spring mounting hole, and one end of the reset spring is hooked onto the spring mounting hole.

[0011] In one embodiment, the spring mounting holes are provided in a plurality of locations along the length of the connecting arm.

[0012] In one embodiment, the angle between the contact rod and the clamping arm is an acute angle, and the width of the contact rod gradually decreases in the direction away from the contact area between the clamping arm and the contact rod.

[0013] As a second aspect, this utility model also provides an isolating circuit breaker, including a handcart frame, three-phase poles, an operating mechanism, and the aforementioned isolating operating handle limiting mechanism. The three-phase poles and the operating mechanism are both mounted on the handcart frame, and the three-phase poles can be controlled to reciprocate 90° via the operating mechanism to connect the circuit or achieve isolation. The operating mechanism includes a housing and a forward and reverse motor mounted inside the housing and having operating contacts. The stop arm is positioned horizontally in front of the operating contacts, and the contact rod extends from the top of the housing.

[0014] In one embodiment, a support is erected inside the housing, and the support is provided with a clearance hole to allow the rotation of the stop arm; when the isolation operation handle limiting mechanism has a mounting base, the mounting base is fixed to one side of the support, and the stop arm passes through the clearance hole on the support.

[0015] The beneficial effects of the technical solution provided by this utility model are as follows: by setting a limit fork and a crank arm to cooperate with each other, the stop arm of the limit fork is horizontal in front of the operating contact of the forward and reverse motor, and the crank arm is pressed against and prevents the isolation operation handle from entering the docking position with the operating contact. When the crank arm is subjected to external pressure (such as the lock on the middle door), it rotates to make room for the rotation path of the stop arm, so that the isolation operation handle can be inserted into the operating contact. By rotating the operating contact, the direction of the forward and reverse motor is controlled, thereby realizing the isolation operation control. Thus, the isolation switch is avoided when the middle door is open, the safety of the isolation operation is improved, and the risk of electric shock is also avoided. 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 structure of the isolation operation handle limiting mechanism provided in one embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the structure of a limiting fork provided in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of a crank arm provided in one embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of a mounting base provided in one embodiment of the present utility model;

[0021] Figure 5 This is a partial structural schematic diagram of the operating mechanism provided in one embodiment of the present utility model. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Understandably, the disconnecting circuit breaker involved in this utility model is a longitudinal rotating disconnecting circuit breaker, which integrates a circuit breaker and a disconnecting switch. In addition, it has three-phase poles and an operating mechanism, which can be used to operate the disconnecting switch to achieve the isolation function. The operating mechanism includes a housing and a forward and reverse rotating motor installed in the housing. The forward and reverse rotating motor is used to control the three-phase poles to rotate longitudinally by 90° to connect the circuit or achieve isolation.

[0027] See Figures 1 to 4 and combined Figure 5 This utility model relates to an isolation operating handle limiting mechanism (hereinafter referred to as "limiting mechanism 100"), which is used to be installed in the operating mechanism of an isolating circuit breaker to block or allow the isolating operating handle to enter the docking position between itself and the operating contacts on the forward and reverse motor in the operating mechanism. This ensures that the isolating operating handle cannot dock with the operating contacts when the middle door is open, but can dock with the operating contacts and operate the isolation function of the isolating circuit breaker when the middle door is closed. This avoids misoperation, prevents electric shock, and improves the safety performance of the isolating circuit breaker.

[0028] Please combine Figure 2 and Figure 3 The limiting mechanism 100 includes a limiting fork 10 and a crank arm 20, with the crank arm 20 disposed on one side of the limiting fork 10. The limiting fork 10 includes a stop arm 11, at least a portion of which is rotatably positioned horizontally in front of the operating contact. The crank arm 20 includes a contact rod 22 and a clamping arm 21 connected to each other. The contact rod 22 is used to receive external pressure (e.g., pressure from a pusher 300 fixed to the inside of the middle door). The clamping arm 21 abuts against one side of the stop arm 11 to limit the rotation of the stop arm 11, thereby preventing the isolation operating handle from entering the docking position between it and the operating contact. It can also rotate clockwise to separate from the stop arm 11 when the contact rod 22 is subjected to pressure, allowing the stop arm 11 to rotatably expose the docking position when subjected to the force of the isolation operating handle insertion.

[0029] In one embodiment, the stop arm 11 rotates in a horizontal direction, and the crank arm 20 rotates in a vertical direction and rotatably enters the rotation path of the stop arm 11 to stop the stop arm 11 from continuing to rotate, or rotatably leaves the rotation path of the stop arm 11 to allow the stop arm 11 to rotate.

[0030] In this embodiment, the clamping arm 21 tilts upward in a clockwise direction and separates from the stop arm 11 when the contact rod 22 is pressed. Preferably, the angle between the contact rod 22 and the clamping arm 21 is an acute angle, and the width of the contact rod 22 gradually decreases in the direction away from the contact area between the clamping arm 21 and the contact rod 22, so that the center of gravity of the crank arm 20 is set relatively low, so that the crank arm 20 can automatically reset under the action of gravity after the pressing action is removed, thus restricting the rotation of the stop arm 11.

[0031] Preferably, the crank arm is further provided with a counterweight head 23, which is connected to the contact rod 22 and the abutment arm 21. The counterweight head 23 is provided with a hinge hole 231, and the crank arm can rotate around the hinge in the vertical direction by passing a rotating shaft through the hinge hole.

[0032] In one embodiment, the limiting fork 10 further includes a connecting arm 12, which is integrally formed with the stop arm 11 at an included angle. Preferably, the included angle is an obtuse angle. Please refer to... Figure 5 The limiting mechanism 100 also includes a return spring, which is connected to the connecting arm 12 and is used to reset the stop arm 11 (i.e., rotate it counterclockwise) when the force of the isolation operating handle on the stop arm 11 is removed, so that the stop arm 11 is placed horizontally in front of the operating contact, thereby restricting the insertion of the isolation operating handle.

[0033] In one embodiment, the limiting mechanism 100 further includes a mounting base 30 for connection to a bracket 400 within the operating mechanism. The limiting fork 10 is rotatably mounted on the mounting base 30, and the return spring is a tension spring 40, with one end connected to the connecting arm 12 and the other end connected to the mounting base 30.

[0034] The limiting fork 10 also includes a mounting part 13, which is integrally formed with the stop arm 11 and the connecting arm 12. The mounting part 13 has a shaft hole 131, and the stop arm 11 and the connecting arm 12 are located on the same side of the diameter of the shaft hole 131.

[0035] Please combine Figure 4In one embodiment, the mounting base 30 includes a horizontal mounting plate 31 and a vertical mounting plate 32 formed by bending the horizontal mounting plate 31 downward. The horizontal mounting plate 31 has a pivot hole 311 corresponding to the shaft hole 131, and the vertical mounting plate 32 has a screw hole 321.

[0036] The limiting fork 10 is rotatably mounted on the horizontal mounting plate 31 by means of a pivot inserted into the pivot hole 131 and the pivot hole 311. The vertical mounting plate 32 is used to fix the bracket 400 with screws inserted in the screw hole 321.

[0037] In one embodiment, the connecting arm 12 has a spring mounting hole 121, the transverse mounting plate 31 extends outward to form a spring connecting arm, the spring connecting arm has a spring connecting hole 312, and the two ends of the reset spring are hooked on the spring mounting hole 121 and the spring connecting hole 312 respectively.

[0038] Optionally, the spring connection hole 312 and the shaft hole 311 are distributed generally along the diagonal of the transverse mounting plate 31.

[0039] In one embodiment, the spring mounting holes 121 are provided in multiple locations along the length of the connecting arm 12, so that the connection position of the reset spring on the connecting arm 12 can be adjusted according to the required elastic force.

[0040] See Figure 5 As a second aspect, this utility model also provides an isolating circuit breaker, including a handcart frame (not shown in the figure, the same below), three-phase poles (not shown in the figure, the same below), an operating mechanism (not shown, the same below), and the aforementioned limiting mechanism 100. The three-phase poles and the operating mechanism are both mounted on the handcart frame, and the three-phase poles can be controlled to reciprocate 90° by the operating mechanism to connect the circuit or achieve isolation. The operating mechanism includes a housing and a forward and reverse motor 200 mounted inside the housing and having an operating contact 210. The stop arm 11 of the limiting fork 10 is placed horizontally in front of the operating contact, and the contact rod 22 extends out from the top of the housing.

[0041] In one embodiment, a bracket 400 is erected inside the housing. The bracket 400 has a clearance hole (not shown, the same below) to allow rotation of the stop arm 11. The clearance hole is rectangular and extends along the width direction (i.e., the horizontal direction) of the bracket. The mounting base 30 is fixed to one side of the bracket 400, and the stop arm 11 passes through the clearance hole on the bracket 400 and can slide within the clearance hole during rotation.

[0042] 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.

[0043] 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. An isolated operating handle position mechanism for setting into an operating mechanism of an isolating circuit breaker and arranged close to the operating contact of the operating mechanism of the forward and reverse motor, characterized in that, The limiting fork and the crank arm are included; The limiting fork includes a blocking arm, at least part of the structure of the blocking arm is rotatably arranged in front of the operating contact; The crank arm includes a contact rod and a blocking arm, the contact rod is used for receiving external pressure, the blocking arm is arranged on one side of the blocking arm and is used for limiting the rotation of the blocking arm to block the isolation operating handle from entering the docking position between the operating contact and the blocking arm, and the blocking arm can be separated from the blocking arm when the contact rod is subjected to the pressure, so that the blocking arm can be rotatably exposed to the docking position when subjected to the force of the insertion of the isolation operating handle.

2. The isolated operating handle stop mechanism of claim 1, wherein, The blocking arm rotates in the horizontal direction, and the crank arm rotates in the vertical direction.

3. The isolated operating handle stop mechanism of claim 1, wherein, The limiting fork further includes a connecting arm, the connecting arm is integrally connected with the blocking arm at an angle; The isolation operating handle limiting mechanism further includes a reset spring, the reset spring is connected with the connecting arm and is used for resetting the blocking arm to be horizontally arranged in front of the operating contact when the force of the isolation operating handle on the blocking arm is removed.

4. The isolated operating handle stop mechanism of claim 3, wherein, The isolation operating handle limiting mechanism further includes a mounting seat, the mounting seat is used for being connected to a support in the operating mechanism; The limiting fork is rotatably mounted on the mounting seat, the reset spring is a tension spring, one end of the tension spring is connected to the connecting arm, and the other end of the tension spring is connected to the mounting seat.

5. The isolated operating handle stop mechanism of claim 4, wherein, The mounting seat includes a horizontal mounting plate and a vertical mounting plate formed by bending the horizontal mounting plate downward, the horizontal mounting plate is provided with a rotating shaft hole, and the vertical mounting plate is provided with a screw hole; The limiting fork is rotatably arranged on the horizontal mounting plate by inserting the rotating shaft into the rotating shaft hole, and the vertical mounting plate is used for being fixed to the support by screwing a screw into the screw hole.

6. The isolated operating handle stop mechanism of claim 3, wherein, The connecting arm is provided with a spring mounting hole, and one end of the reset spring is hooked on the spring mounting hole.

7. The isolated operating handle stop mechanism of claim 6, wherein, The spring mounting hole is divided into a plurality of spring mounting holes along the length direction of the connecting arm.

8. The isolated operating handle stop mechanism of claim 3, wherein, The angle between the contact rod and the blocking arm is an acute angle, and the width of the contact rod gradually decreases in the direction away from the contact position between the blocking arm and the contact rod.

9. An isolating circuit breaker comprising a trolley frame, a three-phase pole column and an operating mechanism, the three-phase pole column and the operating mechanism are arranged on the trolley frame, and the three-phase pole column can be controlled to rotate back and forth by 90° by the operating mechanism to connect the circuit or realize isolation, the operating mechanism comprises a box body and a forward-reverse motor arranged in the box body and having an operating contact, characterized in that, The isolation operating handle limiting mechanism of any one of claims 1 to 8 is further included, wherein the blocking arm is horizontally arranged in front of the operating contact, and the contact rod is arranged to pass through the top end of the box body.

10. The isolating circuit breaker of claim 9, wherein, The support is vertically arranged in the box body, and the support is provided with a clearance hole for avoiding the rotation of the blocking arm; When the isolation operating handle limiting mechanism has the mounting seat, the mounting seat is fixed to one side of the support, and the blocking arm passes through the clearance hole in the support.

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