A circuit breaker anti-slow opening device

Abstract

The present invention belongs to the technical field of circuit breakers, and discloses a circuit breaker anti-slow opening device, which is arranged on the circuit breaker. The circuit breaker includes a piston cylinder, a piston rod, a lifting rod and a hydraulic drive mechanism. The piston rod can move to the closing position by retracting relative to the piston cylinder. The piston rod is connected to the hydraulic drive mechanism through the lifting rod. The hydraulic drive mechanism can drive the piston rod to extend and retract in the piston cylinder, and can fix the piston rod in the closing position. The circuit breaker anti-slow opening device includes a fixing assembly and an elastic sheet. The fixing assembly is fixedly arranged below the piston cylinder, and the elastic sheet is fixedly arranged on the fixing assembly. An elastic clamp is protrudingly arranged on the elastic sheet. A clamping groove is correspondingly provided on the outer side wall of the lifting rod. The elastic clamp is suitable for clamping with the clamping groove when the piston rod moves to the closing position, so that the piston rod is kept in the closing position when the hydraulic drive mechanism fails. The circuit breaker anti-slow opening device provided by the present invention has a simple structure, is easy to arrange, and can realize an effective anti-slow opening function.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a circuit breaker anti-slow opening device. Background Art

[0002] The circuit breaker mainly uses a hydraulic drive mechanism as a driving component for opening or closing. When the hydraulic drive mechanism is in normal working condition, the internal oil pressure is normal, so that the piston rod can be kept in the closed position. However, when the hydraulic drive mechanism has abnormal pressure loss or other faults, the piston rod can no longer be reliably supported in the closed position. At this time, when the sum of the forces such as the piston rod's own gravity, atmospheric pressure, and the resistance contact reaction force is greater than the system's own friction force, the piston rod and other components will move slowly downward, that is, the circuit breaker contacts will be slowly opened, which has serious safety hazards and will cause the circuit breaker to explode in severe cases.

[0003] At present, some manufacturers have specially designed some anti-slow-release devices for preventing the piston rod from leaving the closed position when the hydraulic drive mechanism loses pressure abnormally. However, the existing anti-slow-release devices have complex structures, many components, high production costs, and are not easy to install and arrange. Summary of the invention

[0004] The object of the present invention is to provide a circuit breaker anti-slow tripping device which has a simple structure and can reliably and effectively realize the anti-slow tripping function.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A circuit breaker anti-slow opening device is arranged on the circuit breaker, the circuit breaker comprises a piston cylinder, a piston rod, a lifting rod and a hydraulic drive mechanism, the first end of the piston rod is movable and retractable in the piston cylinder, the piston rod is retracted relative to the piston cylinder and can move to a closing position, the second end of the piston rod is connected to the hydraulic drive mechanism through the lifting rod, the hydraulic drive mechanism can drive the piston rod to retract in the piston cylinder, and can fix the piston rod in the closing position, the circuit breaker anti-slow opening device comprises:

[0007] A fixing assembly, fixedly arranged below the piston cylinder;

[0008] An elastic sheet is fixedly arranged on the fixing assembly, an elastic clamp is protruding from the elastic sheet, a clamping groove is correspondingly provided on the outer side wall of the lifting rod, and the elastic clamp is suitable for clamping with the clamping groove when the piston rod moves to the closing position, so that the piston rod can be maintained in the closing position when the hydraulic drive mechanism fails.

[0009] Optionally, at least two of the fixing components and at least two of the elastic sheets are provided accordingly.

[0010] Optionally, the fixing assembly includes a fixing block and a fixing bracket, the fixing block is fixedly disposed below the piston cylinder, the fixing bracket is fixedly disposed below the fixing block, the first end of the elastic sheet is fixedly connected to the fixing block, and the second end of the elastic sheet is fixedly connected to the fixing bracket.

[0011] Optionally, a first fixing groove is formed on the fixing block, and the first end of the elastic sheet is inserted into the first fixing groove.

[0012] Optionally, the elastic sheet is welded to the first fixing groove.

[0013] Optionally, a second fixing groove is formed on the fixing bracket, and the second end of the elastic sheet is inserted into the second fixing groove.

[0014] Optionally, a fixing plate is fixedly disposed below the piston cylinder, and the fixing block is fixedly disposed below the fixing plate.

[0015] Optionally, the fixing plate is fixed to the piston cylinder via a plurality of first fixing members, the fixing block is fixed to the fixing plate via a plurality of second fixing members, and the fixing bracket is fixed to the fixing block via a plurality of third fixing members.

[0016] Optionally, the first fixing member, the second fixing member and the third fixing member are all configured as screws.

[0017] Optionally, the fixing block is configured in a fan ring shape, and an avoidance groove for avoiding the first fixing member is provided on the fixing block.

[0018] Beneficial effects:

[0019] The circuit breaker anti-slow opening device provided by the present invention has a fixing component fixedly arranged below the piston cylinder and used for fixing the elastic sheet, an elastic clamping head is protruding from the elastic sheet, and a clamping groove is correspondingly opened on the outer wall of the lifting rod. When the piston rod retracts relative to the piston cylinder and moves to the closing position, the elastic clamping head on the elastic sheet can be clamped in the clamping groove. When the hydraulic drive mechanism has an unexpected pressure loss or other faults and can no longer reliably support the piston rod in the closing position, the elastic clamping head clamped in the clamping groove will provide an upward supporting force to the groove wall of the clamping groove to prevent the piston rod from moving slowly downward, so that the piston rod can be reliably maintained in the closing position. The structure is simple and easy to arrange, and an effective anti-slow opening function can be achieved only through the mechanical structure of the fixing component and the elastic sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic structural diagram of a circuit breaker anti-slow opening device provided in Embodiment 1 of the present invention when the circuit breaker is in a closed state;

[0021] Figure 2 It is a structural schematic diagram of a circuit breaker slow opening prevention device provided in the circuit breaker closing or opening process provided in the first embodiment of the present invention;

[0022] Figure 3 1 is a schematic structural diagram of a circuit breaker anti-slow opening device provided in Embodiment 1 of the present invention when the circuit breaker is in an open state;

[0023] Figure 4 is an exploded schematic diagram of a fixing plate and a fixing block provided in Embodiment 1 of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the fixing plate and the fixing block provided in the first embodiment of the present invention when viewed from an upward perspective.

[0025] In the figure:

[0026] 110, fixing block; 1101, second connecting hole; 1102, third mounting hole; 111, first fixing groove; 112, avoidance groove; 120, fixing bracket; 121, second fixing groove; 130, fixing plate; 1301, first connecting hole; 141, first fixing member; 142, second fixing member; 143, third fixing member;

[0027] 200, elastic sheet; 210, elastic clamp;

[0028] 310, piston cylinder; 320, piston rod; 330, lifting rod; 331, clamping groove. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] Embodiment 1

[0034] Reference Figures 1 to 3 As shown, this embodiment provides a circuit breaker anti-slow opening device. The circuit breaker anti-slow opening device is arranged on the circuit breaker, and the circuit breaker includes a piston cylinder 310, a piston rod 320, a lifting rod 330 and a hydraulic drive mechanism (not shown). The first end of the piston rod 320 is movable and retractable in the piston cylinder 310, and the piston rod 320 is retracted relative to the piston cylinder 310 and can move to the closing position. The second end of the piston rod 320 is connected to the hydraulic drive mechanism through the lifting rod 330, and the hydraulic drive mechanism can drive the piston rod 320 to retract in the piston cylinder 310 and fix the piston rod 320 in the closing position.

[0035] The circuit breaker anti-slow opening device includes a fixing component and an elastic sheet 200, wherein the fixing component is fixedly arranged below the piston cylinder 310, the elastic sheet 200 is fixedly arranged on the fixing component, an elastic clamp 210 is protrudingly arranged on the elastic sheet 200, and a clamping groove 331 is correspondingly provided on the outer side wall of the lifting rod 330. The elastic clamp 210 is suitable for clamping with the clamping groove 331 when the piston rod 320 moves to the closing position, so that the piston rod 320 can be kept in the closing position when the hydraulic drive mechanism fails.

[0036] When the piston rod 320 is retracted relative to the piston cylinder 310 and moved to the closing position, the elastic clamp 210 on the elastic sheet 200 can be clamped in the clamping groove 331. When the hydraulic drive mechanism has an unexpected pressure loss or other faults and can no longer reliably support the piston rod 320 in the closing position, the elastic clamp 210 clamped in the clamping groove 331 will provide an upward supporting force to the groove wall of the clamping groove 331 to prevent the piston rod 320 from moving slowly downward, thereby allowing the piston rod 320 to be reliably maintained in the closing position. The structure is simple and easy to arrange, and an effective anti-slow separation function can be achieved only through the mechanical structure of the fixing component and the elastic sheet 200.

[0037] Specifically, the piston cylinder 310 is fixedly arranged on the circuit breaker body (not shown), the piston rod 320 is telescopically arranged on the piston cylinder 310 in the vertical direction, the first end of the lifting rod 330 is fixedly connected to the second end of the piston rod 320, and the second end of the lifting rod 330 is connected to the hydraulic drive mechanism. The piston rod 320 of the circuit breaker moves upward from the open position to the closed position. Figures 1 to 3 shown.

[0038] Specifically, Figure 1 The figure is a schematic structural diagram when the piston rod 320 is in the closing position. When the piston rod 320 is in this position, the elastic clamping head 210 on the elastic sheet 200 is clamped in the clamping groove 331 provided on the lifting rod 330 .

[0039] When the hydraulic drive mechanism works normally, the hydraulic drive mechanism can support the lifting rod 330 so that the piston rod 320 is reliably fixed in the closed position. Figure 2 As shown, the hydraulic drive mechanism applies a large driving force to the lifting rod 330, driving the lifting rod 330 to move downward rapidly. When the lifting rod 330 moves downward, the engaging groove 331 tends to disengage from the elastic clamp 210. Since the outward lateral thrust of the engaging groove 331 applied to the elastic clamp 210 by the engaging groove 331 is greater than the combined force of the friction force of the elastic clamp 210 on the engaging groove 331 and the elastic force of the elastic sheet 200 itself, the elastic sheet 200 will bend elastically in the direction away from the piston rod 320 during the process to allow the elastic clamp 210 to disengage from the engaging groove 331. Then, the hydraulic drive mechanism continues to drive the lifting rod 320 to move downward to the position shown in FIG. Figure 3 The open position is shown.

[0040] When the circuit breaker is closed normally in the open state, refer to Figure 3As shown, the hydraulic drive mechanism provides a large driving force to the lifting rod 330, driving the lifting rod 330 to move upward quickly. When the side wall of the lifting rod 330 contacts the elastic clamp 210, the side wall of the lifting rod 330 gives the elastic clamp 210 a lateral thrust outward that is greater than the combined force of the friction force of the elastic clamp 210 on the side wall of the lifting rod 330 and the elastic force of the elastic sheet 200 itself, so that the elastic sheet 200 is elastically bent in the direction away from the piston rod 320, thereby causing the lifting rod 330 to push the elastic clamp 210 outward to Figure 2 The lifting rod 330 then continues to move upward until the piston rod 320 reaches the closing position. Figure 1 As shown, the elastic clamp head 210 is clamped into the clamping groove 331 again.

[0041] When the hydraulic drive mechanism encounters an unexpected pressure loss or other fault, the hydraulic drive mechanism can no longer reliably support the piston rod 320 in the closed position. At this time, the elastic clamping head 210 clamped in the clamping groove 331 will provide an upward supporting force to the groove wall of the clamping groove 331, which can effectively overcome the combined force of the piston rod 320, lifting rod 330 and other connecting components' own gravity, atmospheric pressure, resistance contact reaction force and other forces, so that the piston rod 320 can be reliably maintained in the closed position, thereby playing an effective role in preventing slow separation.

[0042] Furthermore, the fixing assembly includes a fixing block 110 and a fixing bracket 120, the fixing block 110 is fixedly disposed below the piston cylinder 310, the fixing bracket 120 is fixedly disposed below the fixing block 110, the first end of the elastic sheet 200 is fixedly connected to the fixing block 110, and the second end of the elastic sheet 200 is fixedly connected to the fixing bracket 120.

[0043] Further, the fixing block 110 is provided with a first fixing groove 111, and the first end of the elastic sheet 200 is inserted into the first fixing groove 111. In this embodiment, the first end of the elastic sheet 200 and the first fixing groove 111 are preferably configured as an interference fit. The fixing bracket 120 is provided with a second fixing groove 121, and the second end of the elastic sheet 200 is inserted into the second fixing groove 121. In this embodiment, the second end of the elastic sheet 200 and the second fixing groove 121 are preferably configured as an interference fit.

[0044] Furthermore, the elastic sheet 200 is welded to the first fixing groove 111. Welding has the characteristics of simple operation, fast and efficient operation process, high overall strength of the welded structure, good density of the connection part, economical and practical, etc. In addition, the welding of the elastic sheet 200 to the first fixing groove 111 can also prevent the elastic sheet 200 from coming out relative to the first fixing groove 111 when deformation occurs, further ensuring the reliability and stability of the fixing of the elastic sheet 200.

[0045] Furthermore, a fixing plate 130 is fixedly disposed below the piston cylinder 310 , and the fixing block 110 is fixedly disposed below the fixing plate 130 .

[0046] In this embodiment, the fixing plate 130 is fixed to the piston cylinder 310 via a plurality of first fixing members 141 , the fixing block 110 is fixed to the fixing plate 130 via a plurality of second fixing members 142 , and the fixing bracket 120 is fixed to the fixing block 110 via a plurality of third fixing members 143 .

[0047] Specifically, refer to Figure 1 , Figures 4 to 5 As shown, corresponding to the plurality of first fixing members 141, the fixing plate 130 is provided with a plurality of first connection holes 1301, and the piston cylinder 310 is provided with a plurality of first mounting holes (not shown), and each first fixing member 141 is connected to the corresponding first mounting hole after penetrating the corresponding first connection hole 1301, thereby realizing reliable fixation between the fixing plate 130 and the piston cylinder 310. Corresponding to the plurality of second fixing members 142, the fixing block 130 is provided with a plurality of second connection holes 1101, and the fixing plate 130 is provided with a plurality of second mounting holes (not shown), and each second fixing member 142 is connected to the corresponding second mounting hole after penetrating the corresponding second connection hole 1101, thereby realizing reliable fixation between the fixing block 110 and the fixing plate 130. Corresponding to the multiple third fixing members 143, the fixing bracket 120 is provided with multiple third connecting holes (not shown), and the fixing block 110 is provided with multiple third mounting holes 1102. Each third fixing member 143 is connected to the corresponding third mounting hole 1102 after passing through the corresponding third connecting hole, thereby achieving reliable fixation between the fixing bracket 120 and the fixing block 110.

[0048] Preferably, in this embodiment, the number of the first fixing member 141, the first connecting hole 1301 and the first mounting hole are all set to four; the number of the second fixing member 142, the second connecting hole 1101 and the second mounting hole are all set to four; the number of the third fixing member 143, the third connecting hole and the third mounting hole 1102 are all set to four.

[0049] Preferably, in this embodiment, the first fixing member 141, the second fixing member 142 and the third fixing member 143 are all configured as screws. Specifically, the first fixing member 141 passes through the corresponding first connection hole 1301 and is screwed to the corresponding first mounting hole; the second fixing member 142 passes through the corresponding second connection hole 1101 and is screwed to the corresponding second mounting hole; the third fixing member 143 passes through the corresponding third connection hole and is screwed to the corresponding third mounting hole 1102.

[0050] In this embodiment, at least two fixing components and at least two elastic sheets 200 are provided. Preferably, in this embodiment, at least two fixing components and at least two elastic sheets 200 are provided, and the two elastic sheets 200 are provided at opposite sides of the piston rod 320 at an interval of 180 degrees, and the lifting rod 330 is also provided with two clamping grooves 331 corresponding to the elastic sheets 200 on each side.

[0051] The present embodiment is not limited thereto, and the number of the fixing components and the elastic sheets 200 may also be three, four, or more, and no further limitation is made herein.

[0052] Further, refer to Figures 4 to 5 As shown, the fixing block 110 is configured in a fan ring shape, and a evacuation groove 112 for evading the first fixing member 141 is provided on the fixing block 110. The evacuation groove 112 can provide an effective penetration space for the first fixing member 141, thereby avoiding interference with the first fixing member 141 when the fixing block 110 is installed on the fixing plate 130.

[0053] Embodiment 2

[0054] The circuit breaker anti-slow tripping device provided in this embodiment is different from that in the first embodiment in that the connection mode between the fixing block 110 and the fixing plate 130 is set to be welding, and the connection mode between the fixing bracket 120 and the fixing block 110 is set to be welding.

[0055] In this embodiment, the fixed bracket 120 is welded to the fixed block 110, and the fixed block 110 is welded to the fixed plate 130, which is equivalent to the fixed bracket 120, the fixed block 110 and the fixed plate 130 being arranged in one piece. On the one hand, the process of separately assembling the fixed plate 130, the fixed block 110 and the fixed bracket 112 is omitted during production and assembly, making the disassembly and assembly process relative to the piston cylinder 320 simpler and more convenient. On the other hand, it can avoid the need to separately equip the second fixing 142, the third fixing member 143 and other connecting components, thereby further reducing production costs and improving practicality.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A circuit breaker anti-slow opening device, arranged on a circuit breaker, the circuit breaker comprising a piston cylinder (310), a piston rod (320), a lifting rod (330) and a hydraulic drive mechanism, the first end of the piston rod (320) is movably retractable in the piston cylinder (310), the piston rod (320) is retracted relative to the piston cylinder (310) and can move to a closing position, the second end of the piston rod (320) is connected to the hydraulic drive mechanism through the lifting rod (330), the hydraulic drive mechanism can drive the piston rod (320) to retract in the piston cylinder (310), and can fix the piston rod (320) in the closing position, characterized in that: The circuit breaker anti-slow opening device comprises: A fixing assembly, fixedly disposed below the piston cylinder (310); An elastic sheet (200) is fixedly arranged on the fixing assembly, an elastic clamp (210) is protrudingly arranged on the elastic sheet (200), a clamping groove (331) is correspondingly provided on the outer side wall of the lifting rod (330), and the elastic clamp (210) is suitable for clamping with the clamping groove (331) when the piston rod (320) moves to the closing position, so that the piston rod (320) can be maintained in the closing position when the hydraulic drive mechanism fails.

2. The circuit breaker anti-slow opening device according to claim 1, characterized in that: At least two of the fixing components and the elastic sheets (200) are correspondingly provided.

3. The circuit breaker anti-slow opening device according to claim 1, characterized in that: The fixing assembly comprises a fixing block (110) and a fixing bracket (120), wherein the fixing block (110) is fixedly disposed below the piston cylinder (310), and the fixing bracket (120) is fixedly disposed below the fixing block (110), and the first end of the elastic sheet (200) is fixedly connected to the fixing block (110), and the second end of the elastic sheet (200) is fixedly connected to the fixing bracket (120).

4. The circuit breaker anti-slow opening device according to claim 3, characterized in that: The fixing block (110) is provided with a first fixing groove (111), and the first end of the elastic sheet (200) is inserted into the first fixing groove (111).

5. The circuit breaker anti-slow opening device according to claim 4, characterized in that: The elastic sheet (200) is welded to the first fixing groove (111).

6. The circuit breaker anti-slow opening device according to claim 4, characterized in that: The fixing bracket (120) is provided with a second fixing groove (121), and the second end of the elastic sheet (200) is inserted into the second fixing groove (121).

7. The circuit breaker anti-slow opening device according to claim 3, characterized in that: A fixing plate (130) is fixedly disposed below the piston cylinder (310), and the fixing block (110) is fixedly disposed below the fixing plate (130).

8. The circuit breaker anti-slow opening device according to claim 7, characterized in that: The fixing plate (130) is fixed to the piston cylinder (310) via a plurality of first fixing members (141), the fixing block (110) is fixed to the fixing plate (130) via a plurality of second fixing members (142), and the fixing bracket (120) is fixed to the fixing block (110) via a plurality of third fixing members (143).

9. The circuit breaker anti-slow opening device according to claim 8, characterized in that: The first fixing member (141), the second fixing member (142) and the third fixing member (143) are all configured as screws.

10. The circuit breaker anti-slow opening device according to claim 8, characterized in that: The fixing block (110) is arranged in a fan-shaped shape, and an avoidance groove (112) for avoiding the first fixing member (141) is provided on the fixing block (110).

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