Environment-friendly cabinet circuit breaker

Abstract

The utility model discloses an environment-friendly cabinet circuit breaker, which comprises a rack, a circuit breaker main body and a grounding contact are arranged on the rack, the circuit breaker main body comprises a connecting contact, an isolation operation shaft is rotatably arranged on the rack, an isolation knife is also arranged on the rack in a swinging manner, and the grounding contact is arranged on the rack. One end of the isolation knife is an assembling end and is rotatably connected with the rack, the other end of the isolation knife is a contact end, the connecting contact and the grounding contact are arranged on the motion trail of the contact end of the isolation knife, the isolation operation shaft is provided with a connecting flange, the connecting flange is connected with the isolation knife through a transmission arm arranged in an arc shape, and the transmission arm is connected with the isolation knife. One end of the transmission arm is rotatably connected with the connecting flange, and the other end is rotatably connected with the isolation knife. The device is simple in structure, more reasonable in structural layout, reliable and stable in isolation operation and transmission, and good in use effect.

Description

Technical Field

[0001] The utility model relates to an environmental protection cabinet circuit breaker. Background Art

[0002] Environmentally friendly cabinet circuit breakers are the core switchgear of environmentally friendly switchgear. They are widely used in medium and low voltage power distribution systems, performing functions such as circuit connection, disconnection, and fault protection. Their most prominent feature is the use of environmentally friendly dielectrics such as air, nitrogen, and solid insulating materials, replacing the potent greenhouse gas SF6 as insulation and arc extinguishing media, thus reducing carbon emissions at the source. This device offers reliable insulation and arc extinguishing performance, quickly interrupting the current in the event of a fault, ensuring system safety. The dielectric is non-toxic and flame-retardant, reducing operational risks. Suitable for use in scenarios such as new energy power plants, data centers, and rail transit, they feature long maintenance cycles and low costs. Existing circuit breakers require significant force to perform isolation operations, making the overall structure cumbersome and bulky, making it difficult to miniaturize and reducing its effectiveness. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention provides an environmentally friendly cabinet circuit breaker, which has a simple structure, a more reasonable structural layout, reliable and stable isolation operation transmission, and good use effect.

[0004] To achieve the above-mentioned objectives, the present utility model provides an environmental protection cabinet circuit breaker, comprising a frame, on which a circuit breaker body and a grounding contact are provided, the circuit breaker body including a connecting contact, an isolating operating shaft rotatably provided on the frame, and an isolating knife swung on the frame, one end of the isolating knife being an assembly end and rotatably connected to the frame, and the other end being a contact end, the connecting contact and the grounding contact being arranged on the motion trajectory of the contact end of the isolating knife, a connecting flange being provided on the isolating operating shaft, the connecting flange being connected to the isolating knife by an arc-shaped transmission arm, one end of the transmission arm being rotatably connected to the connecting flange, and the other end being rotatably connected to the isolating knife.

[0005] The beneficial effect of this arrangement is that, compared to linear or complex transmission structures, the use of an arc-shaped transmission arm to connect the connecting flange and the isolating blade of the isolation operating shaft enables force and motion transmission within a smaller space, making the entire isolation operating structure more compact. This facilitates the integrated installation of environmental protection cabinet circuit breakers within limited cabinet space, meeting the requirements of miniaturization of environmental protection cabinets. When the isolation operating shaft rotates, the transmission arm is driven by the connecting flange, which in turn drives the isolating blade to swing. The arc-shaped transmission arm can effectively disperse stress during transmission, reducing wear and deformation between components, ensuring smooth force transmission during operation, and enabling the isolating blade to accurately contact and separate with the connecting contact or grounding contact according to a predetermined trajectory, thereby improving the reliability of the opening and closing operations.

[0006] As a further configuration of the present invention, an isolation knife seat is provided on the frame corresponding to the isolation knife position, the isolation knife assembly end is rotatably connected to the isolation knife seat through a rotating shaft, and the isolation knife seat is provided with a ring-shaped accommodating cavity corresponding to the rotating shaft position, and a finger contact spring is provided in the accommodating cavity.

[0007] The beneficial effect of this arrangement is that the finger spring in the annular accommodating cavity forms continuous elastic pressure on the rotating shaft, ensuring that the isolation knife assembly end and the cutter head seat are always in close contact, reducing the contact resistance of the connection part, reducing the current transmission loss, improving the temperature rise problem from the source, and avoiding insulation aging caused by local overheating. At the same time, the elastic compression structure can compensate for the wear gap caused by long-term rotation, buffer the mechanical vibration during operation, and ensure contact stability. In addition, the cutter head seat provides precise positioning and support for the rotating shaft, improves the consistency of the isolation knife's swing trajectory, and cooperates with the uniform force of the finger spring to further optimize the current conduction path, adapt to high-frequency operation scenarios, and extend the service life of the equipment.

[0008] As a further configuration of the present invention, the isolation knife is divided into two blade heads, and a matching groove for engaging with a connecting contact or a grounding contact is formed between the two blade heads.

[0009] The beneficial effects of this setting are: with this setting, the matching slot can be precisely connected with the connecting contact or the grounding contact, increasing the contact area, reducing the contact resistance, and improving the conductivity and current stability; the split structure makes the tool head processing and assembly more flexible, adaptable to contacts of different specifications, and easy to maintain and replace; the clamping method enhances the reliability of the mechanical connection, and the contacts are not easy to fall off when opening and closing, ensuring the stability of the operation.

[0010] As a further configuration of the present invention, a clamping plate is connected between the two blade heads, and a connecting flange is extended from the clamping plate out of the matching groove, and the transmission arm is rotatably connected to the connecting flange.

[0011] The beneficial effects of this setting are: with this setting, the clamping plate structurally limits the two-part blade head, offsets the impact force of opening and closing and the influence of long-term thermal expansion and contraction of current carrying, firmly matches the slot width, ensures the contact connection accuracy and electrical connection stability, and reduces the risk of poor contact; the connecting flange provides an adaptive connection point for the transmission arm, makes the transmission force more balanced, optimizes the force transmission path, and improves the operation synchronization and movement smoothness; at the same time, it strengthens the overall rigidity of the isolation knife, disperses stress concentration, delays component wear and aging, and helps the environmental protection cabinet circuit breaker to operate stably for a long time under high-frequency operation and complex working conditions, thereby improving equipment reliability and service life.

[0012] As a further configuration of the present invention, a clamping screw is also provided on the two cutting heads, and a clamping spring is in contact between the head of the clamping screw and the side wall of one of the cutting heads. The other end of the clamping screw is threadedly fitted with a fastening screw, and the fastening screw is pressed against the side wall of the other cutting head.

[0013] The beneficial effects of this setting are: with this setting, the tightening spring forms an elastic pre-tightening force between the screw head and the blade head, which can automatically compensate for the gap caused by wear of the blade head due to long-term use or thermal expansion and contraction, and continuously ensure the clamping force of the matching slot on the contact to avoid loose contact; the fastening screw accurately adjusts the distance between the two blade heads through thread matching, adapts to contacts of different thicknesses, and improves the versatility of the structure; the elastic clamping method can buffer the mechanical impact of opening and closing operations, reduce contact wear, reduce contact resistance fluctuations, ensure stable current conduction, and effectively improve the connection reliability and service life of the environmental protection cabinet circuit breaker under frequent operation and complex working conditions.

[0014] As a further configuration of the present invention, the connecting contact and the grounding contact are respectively provided with a protrusion, and the protrusion is connected to the edge of the connecting contact or the edge of the grounding contact via a smooth inclined surface.

[0015] The beneficial effects of this arrangement are as follows: With this arrangement, the ridges can form a precise fit with the mating grooves of the isolating blades, increasing contact pressure and effective contact area, reducing contact resistance, reducing heat loss, ensuring stable current conduction, and avoiding poor contact due to vibration or slight displacement; the smooth bevel guides the isolating blades along the bevel to smoothly slide into or out of the ridges during opening and closing, reducing mechanical jamming and impact wear, lowering operational resistance, and improving operational reliability. Furthermore, the bevel transition disperses the electric field strength, avoiding insulation aging caused by localized electric field concentration and extending the service life of the contacts; the ridge structure enhances the mechanical strength of the contacts, allowing them to better withstand clamping force and short-circuit current shocks, adapting to the long-term and stable operation of environmentally friendly cabinet circuit breakers under complex working conditions.

[0016] As a further configuration of the present invention, the frame is provided with an arc isolation plate between the grounding contact and the connecting contact.

[0017] The beneficial effects of this setting are: it can effectively prevent the arc generated during opening and closing from spreading to the surrounding area, avoid the arc from causing burning damage to adjacent contacts or insulating components, and reduce the risk of insulation aging; at the same time, it can reduce the leakage of arc energy, prevent the arc from causing ionization of the gas inside the cabinet or excessive temperature rise, and improve arc extinguishing efficiency and operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic cross-sectional view of an embodiment of the present invention;

[0020] Figure 3 This is a partial enlarged view of the isolation knife position in the embodiment of the present utility model;

[0021] Figure 4 This is a schematic cross-sectional view of the connection between the isolation blade and the isolation blade holder in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The implementation of the environmental protection cabinet circuit breaker of the utility model is as follows Figures 1 to 4 As shown: it includes a frame 1, on which a circuit breaker body 2 and a grounding contact 11 are provided, and the circuit breaker body 2 includes a connecting contact 21, an isolating operating shaft 3 is rotatably provided on the frame 1, and an isolating knife 4 is also swingably provided on the frame 1, one end of the isolating knife 4 is an assembly end and is rotatably connected to the frame 1, and the other end is a contact end, the connecting contact 21 and the grounding contact 11 are arranged on the motion trajectory of the contact end of the isolating knife 4, and a connecting flange 31 is provided on the isolating operating shaft 3, and the connecting flange 31 is connected to the isolating knife 4 through an arc-shaped transmission arm 32, and one end of the transmission arm 32 is rotatably connected to the connecting flange 31, and the other end is rotatably connected to the isolating knife 4. The beneficial effect of this arrangement is that, compared to a linear or complex transmission structure, the arc-shaped transmission arm 32 is used to connect the connecting flange 31 of the isolation operating shaft 3 and the isolation blade 4. This arrangement can achieve force and motion transmission in a smaller space, making the entire isolation operating structure more compact, facilitating the integrated installation of the environmental protection cabinet circuit breaker within the limited cabinet space, and meeting the miniaturization requirements of the environmental protection cabinet. When the isolation operating shaft 3 rotates, the transmission arm 32 is driven to move via the connecting flange 31, and the transmission arm 32 then drives the isolation blade 4 to swing. The arc-shaped transmission arm 32 can effectively disperse stress during the transmission process, reduce wear and deformation between components, ensure smooth force transmission during operation, and enable the isolation blade 4 to accurately contact and separate with the connection contact 21 or the grounding contact 11 according to a predetermined trajectory, thereby improving the reliability of the opening and closing operations.

[0023] As a further configuration of the present invention, an isolation knife seat 13 is provided on the frame 1 corresponding to the position of the isolation knife 4, and the assembly end of the isolation knife 4 is rotatably connected to the isolation knife seat 13 via a rotating shaft 45. The isolation knife seat 13 is provided with an annular accommodating cavity corresponding to the position of the rotating shaft 45, and a finger spring 14 is provided in the accommodating cavity. The beneficial effect of such a configuration is that with such a configuration, the finger spring 14 in the annular accommodating cavity forms a continuous elastic pressure on the rotating shaft, ensuring that the assembly end of the isolation knife 4 is always in close contact with the cutter head seat, reducing the contact resistance of the connection part, reducing the current transmission loss, improving the temperature rise problem from the source, and avoiding insulation aging caused by local overheating. At the same time, the elastic pressing structure can compensate for the wear gap caused by long-term rotation, buffer the mechanical vibration during operation, and ensure contact stability. In addition, the cutter head seat provides precise positioning and support for the rotating shaft, improves the consistency of the swing trajectory of the isolation knife, cooperates with the uniform force of the finger spring, further optimizes the current conduction path, adapts to high-frequency operation scenarios, and extends the service life of the equipment.

[0024] As a further feature of this embodiment, the isolating blade 4 is split into two separate blade heads 41. A mating slot is formed between the two blade heads 41 for engaging with the connecting contact 21 or the grounding contact 11. This arrangement provides the following benefits: the mating slot precisely engages with the connecting contact 21 or the grounding contact 11, increasing the contact area, reducing contact resistance, and improving electrical conductivity and current flow stability. The split structure allows for more flexible blade processing and assembly, accommodating contacts of varying specifications and facilitating maintenance and replacement. The snap-fit ​​connection enhances mechanical connection reliability, preventing the contacts from falling off during opening and closing, ensuring operational stability.

[0025] As a further arrangement of this embodiment, a clamping plate 33 is further connected between the two blade heads 41, and the clamping plate 33 has a connecting flange 31 extending outward from the matching groove, and the transmission arm 32 is rotatably connected to the connecting flange 31. The beneficial effect of this arrangement is as follows: with this arrangement, the clamping plate 33 structurally limits the two blade heads 41, offsets the impact of opening and closing and the influence of long-term current-carrying thermal expansion and contraction, stabilizes the matching groove width, ensures the contact clamping accuracy and electrical connection stability, and reduces the risk of poor contact; the connecting flange 31 provides an adaptive connection point for the transmission arm 32, so that the transmission force is more balanced, optimizes the force transmission path, and improves the synchronization of operation and the smoothness of movement; at the same time, it strengthens the overall rigidity of the isolation knife 4, disperses stress concentration, delays the wear and aging of components, and helps the environmental protection cabinet circuit breaker to operate stably for a long time under high-frequency operation and complex working conditions, thereby improving the reliability and service life of the equipment.

[0026] As a further configuration of this embodiment, a clamping screw 42 is also provided on the two blade heads 41. A clamping spring 43 is provided between the head of the clamping screw 42 and the side wall of one of the blade heads 41. The other end of the clamping screw 42 is threadedly engaged with a fastening screw 44, and the fastening screw 44 is pressed against the side wall of the other blade head 41. The beneficial effect of this configuration is that the fastening spring forms an elastic pre-tightening force between the screw head and the blade head 41, which can automatically compensate for the wear of the blade head 41 caused by long-term use or the gap caused by thermal expansion and contraction, continuously ensure the clamping force of the matching slot on the contact, and avoid loose contact; the fastening screw 44 accurately adjusts the distance between the two blade heads 41 through threaded engagement, adapts to contacts of different thicknesses, and improves the versatility of the structure; the elastic clamping method can buffer the mechanical impact of the opening and closing operations, reduce contact wear, reduce contact resistance fluctuations, ensure stable current conduction, and effectively improve the connection reliability and service life of the environmental protection cabinet circuit breaker under frequent operations and complex working conditions.

[0027] As a further configuration of this embodiment, a protrusion 22 is provided on the connecting contact 21 and the grounding contact 11, respectively. The protrusion 22 is connected to the edge of the connecting contact 21 or the edge of the grounding contact 11 through a smooth bevel. The beneficial effect of this configuration is as follows: with this configuration, the protrusion 22 can form a precise fit with the matching groove of the isolating knife 4, thereby increasing the contact pressure and effective contact area, reducing the contact resistance, reducing heat loss, ensuring stable current conduction, and avoiding poor contact caused by vibration or slight displacement; the smooth bevel guides the isolating knife 4 to slide smoothly into or out of the protrusion 22 along the bevel when opening and closing the switch, reducing mechanical jamming and impact wear, reducing operational resistance, and improving operational reliability. In addition, the bevel transition disperses the electric field strength, avoids insulation aging caused by local electric field concentration, and extends the service life of the contact; the protrusion 22 structure enhances the mechanical strength of the contact, can better withstand the clamping force and short-circuit current impact, and adapts to the long-term stable operation of the environmental protection cabinet circuit breaker under complex working conditions.

[0028] As a further feature of this embodiment, the frame 1 is provided with an arc-isolating plate 12 between the grounding contact 11 and the connecting contact 21. This arrangement has the following beneficial effects: it effectively blocks the arc generated during opening and closing from spreading to the surrounding area, preventing the arc from burning and damaging adjacent contacts or insulating components, and reducing the risk of insulation aging; it also reduces the leakage of arc energy, preventing the arc from causing ionization of the gas inside the cabinet or excessive temperature rise, thereby improving arc extinguishing efficiency and operational safety.

[0029] The above example is only one preferred specific example of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. An environmental protection cabinet circuit breaker, comprising a frame, a circuit breaker body and a grounding contact disposed on the frame, the circuit breaker body including a connection contact, and an isolation operating shaft rotatably disposed on the frame, characterized in that: An isolation knife is also swingably arranged on the frame, one end of the isolation knife is an assembly end and is rotatably connected to the frame, and the other end is a contact end. The connecting contact and the grounding contact are arranged on the motion trajectory of the contact end of the isolation knife. A connecting flange is provided on the isolation operating shaft, and the connecting flange is connected to the isolation knife through an arc-shaped transmission arm. One end of the transmission arm is rotatably connected to the connecting flange, and the other end is rotatably connected to the isolation knife.

2. The environmental protection cabinet circuit breaker according to claim 1, characterized in that: An isolation knife seat is provided on the frame corresponding to the isolation knife position. The isolation knife assembly end is rotatably connected to the isolation knife seat through a rotating shaft. The isolation knife seat is provided with a ring-shaped accommodating cavity corresponding to the rotating shaft position. A finger contact spring is provided in the accommodating cavity.

3. The environmental protection cabinet circuit breaker according to claim 1, characterized in that: The isolating blade is divided into two blade heads, and a matching groove for clamping with a connecting contact or a grounding contact is formed between the two blade heads.

4. The environmental protection cabinet circuit breaker according to claim 3, characterized in that: A clamping plate is further connected between the two cutting heads. The clamping plate has a connecting flange extending outward from the matching groove, and the transmission arm is rotatably connected to the connecting flange.

5. The environmental protection cabinet circuit breaker according to claim 3, characterized in that: The two cutting heads are also provided with a clamping screw, a clamping spring is in contact between the clamping screw head and one of the side walls of the cutting head, and the other end of the clamping screw is threadedly matched with a fastening screw, which is pressed against the side wall of the other cutting head.

6. The environmental protection cabinet circuit breaker according to claim 3, characterized in that: The connecting contact and the grounding contact are respectively provided with a protrusion, and the protrusion is connected to the edge of the connecting contact or the edge of the grounding contact via a smooth inclined surface.

7. The environmental protection cabinet circuit breaker according to claim 1, characterized in that: The frame is provided with an arc isolation plate between the grounding contact and the connecting contact.

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