A residual current circuit breaker

Abstract

The application discloses a residual current protection circuit breaker and relates to the technical field of leakage protectors, which comprises a breaking part and a detection part, wherein the detection part comprises a shell, a moving contact and a static contact arranged in the shell, and further comprises: a floating plate arranged in the shell, which drives the moving contact to move upward and electrically connect with the static contact when the water level rises; a confluence assembly arranged in the shell, which comprises a plurality of water storage hoppers, and when it rains, the rainwater is stored in the water storage hoppers, and then the water storage hoppers are turned over and pour rainwater on the upper surface of the floating plate, and the floating plate is inclined and swings; a sewage discharge assembly arranged in the shell, which comprises a sewage discharge groove and a flow guide groove; the application can cut off the power supply in advance before the equipment is flooded, automatically restore the power supply when the water level falls, and does not need manual closing and troubleshooting of false tripping; the false tripping is prevented through vibration cleaning of the contact; the inclined bottom plate cooperates with the sewage discharge structure to automatically discharge silt, avoids silt accumulation and blockage of components, and improves the outdoor operation safety and stability.

Description

Technical Field

[0001] This invention relates to the field of residual current circuit breaker technology, and in particular to a residual current protection circuit breaker. Background Technology

[0002] With the continuous expansion of low-voltage power distribution network coverage, the widespread use of various electrical equipment, and the increasingly diverse electrical application scenarios, power distribution lines are often exposed to complex operating conditions and natural environments, making them prone to residual current anomalies. In order to effectively ensure the safety of electricity users, ensure the stable operation of electrical equipment, and improve the overall safety management level of low-voltage power distribution systems, special protection against residual current in power distribution circuits has become an important development requirement in the power distribution field. Residual current protection circuit breakers are also gradually being widely used in various power distribution scenarios.

[0003] Chinese patent application CN102290292A discloses a residual current protection circuit breaker, which includes a zero-sequence current transformer with an annular central cavity, a power supply side terminal assembly, and a load side terminal assembly. The power supply side terminal assembly includes A, B, and C pole incoming terminals, and the load side terminal assembly includes A, B, and C pole outgoing terminals.

[0004] Chinese patent application CN104347329A discloses a residual current protection circuit breaker, including a housing, a circuit control board disposed inside the housing, and a zero-sequence current transformer. The zero-sequence current transformer is connected to a zero-sequence current transformer plug. The outer surface of the housing is provided with a display screen, buttons, indicator lights, a manual trip push rod, and a switch opening / closing handle.

[0005] The above-mentioned technical solutions have some problems in use. For example, traditional residual current circuit breakers cannot cut off power in advance before the water level submerges electrical equipment in temporary power supply for farmland drainage, outdoor low-lying construction sites, or outdoor scenarios prone to flash floods. They can only trigger protection after the equipment is flooded and leaks electricity. In unattended outdoor environments, the equipment being energized while flooded can cause safety accidents. If the electrical equipment is submerged, forcibly turning on the electrodes can easily cause serious safety accidents such as short circuits, leakage, or even electric shock. At the same time, the moving and stationary contacts are easily affected by large impurities or small debris sticking to the contacts, which can lead to false tripping. Furthermore, the accumulation of mud and sand can hinder the linkage of components, causing problems such as float plate jamming and malfunction. Overall, the reliability and safety of operation are insufficient.

[0006] Therefore, it is necessary to invent a residual current protection circuit breaker to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a residual current protection circuit breaker to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a residual current protection circuit breaker, comprising a circuit breaking section and a detection section, wherein the detection section includes a housing and a moving contact and a stationary contact disposed inside the housing, and further includes: The float plate is located inside the casing. When the external water level rises, the float plate moves the moving contact upward and connects it to the stationary contact. The confluence assembly, located inside the housing, includes multiple water storage hoppers. When it rains, the rainwater is stored inside the water storage hoppers, causing them to flip and pour the rainwater onto the upper surface of the float plate, causing the float plate to tilt and swing. The sewage discharge assembly, located inside the housing, includes a sewage discharge trough and a flow guide trough. When the float tilts, the flow guide trough directs rainwater on the upper surface of the float to flush the sewage discharge trough.

[0009] Preferably, the bus assembly further includes: The diversion plate is symmetrically arranged on the upper side of the shell. The upper surface of the diversion plate is provided with multiple drainage slopes to collect rainwater above the diversion plate and collect it below the drainage slopes. The drain outlet is located inside the diversion plate and at the lowest point of the drainage slope. The drain outlet is located directly above the opening of the water storage hopper in the vertical direction.

[0010] Preferably, the bus assembly further includes: The support frame is symmetrically arranged on both sides of the water storage hopper in an "L" shape. One end of the support frame is fixedly connected to the lower surface of the diversion plate, and the other end is hinged to the side of the water storage hopper. The water storage hopper is equipped with a counterweight on the side away from each other, and the hinge position is located below the side of the water storage hopper closest to the counterweight. When the hopper is empty, the center of gravity of the water storage hopper is located at the support frame, keeping the water storage hopper vertical. When the hopper is full, the center of gravity shifts and causes the water storage hopper to flip.

[0011] Preferably, filter screens are provided on both sides of the outer casing, and the drain trough and the guide trough are both located on one side of the filter screens, which are used to filter out large impurities from the outside and allow rainwater to enter the interior of the outer casing.

[0012] Preferably, the sewage discharge assembly further includes: The bottom plate is located on the lower side of the outer shell. The upper surface of the bottom plate is a slope that is higher in the middle and lower on both sides. The sewage trough is opened at the bottom of the slope of the bottom plate. The guide channel is symmetrically opened on the upper surface of the floating plate and corresponds to the position of the sewage trough. The bottom plate guides the impurities in the rainwater to flow into the sewage trough. The sewage trough is used to temporarily collect and store the impurities in the rainwater.

[0013] Preferably, a plurality of elastic elements are provided above the bottom plate. The elastic elements are elastic, and the bottom of the float plate is hinged to the upper surface of the elastic elements. When rainwater carrying mud and sand flows to the upper surface of the float plate, the float plate squeezes the elastic elements to tilt and discharge the mud and sand obliquely. When the water storage bucket flips over to pour the collected rainwater onto the float plate, the float plate drives the moving contact to tilt and swing up and down with the help of the elastic elements.

[0014] Preferably, two sets of baffles are symmetrically arranged on the float plate. The baffles are located on both sides of the moving contact and correspond to the guide groove. When the water storage bucket flips over to pour the collected rainwater onto the float plate, the baffles prevent the rainwater from washing away the moving contact. An insulating base is provided between the float plate and the moving contact.

[0015] Preferably, the installation height of the stationary contact is lower than the minimum installation height of the other electrical equipment on the circuit. The stationary contact is electrically connected to the circuit breaker through a line. When the water level rises to a preset height, the float moves the moving contact upward and closes with the stationary contact, and the circuit breaker disconnects the circuit.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention, by setting up a floating plate and contact structure linked to water level, can trigger power outage in advance before the outdoor water level rises and the electrical equipment is submerged, adapting to outdoor rain and water level fluctuation scenarios and avoiding the safety risks caused by powering on the equipment after it has been flooded.

[0017] 2. When the water level changes, the float plate can automatically drive the contacts to complete the closing and opening of the circuit. The circuit can automatically restore power without manual closing and there is no need to reconnect the circuit to check for false tripping, effectively avoiding the risk of powering on electrical equipment when it is in a state of water ingress.

[0018] 3. This invention uses a filter screen on the outer shell to block large impurities and a busbar assembly to drive the float plate to swing and clean the contacts, automatically removing small debris from the contact surface and gaps, preventing rainwater from wetting impurities and forming conductive water bridges that could cause the circuit to trip unexpectedly, thus ensuring power supply stability.

[0019] 4. The present invention uses a drainage structure consisting of an inclined bottom plate, a drainage trough, and a guide trough to automatically collect and flush out mud and sand impurities inside the shell, eliminating the need for manual cleaning and preventing mud and sand accumulation from hindering the descent of the floating plate and affecting the flexibility of component linkage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a schematic diagram of the overall structure of the distribution box and detection unit of the present invention in a usage scenario; Figure 4 This is a schematic diagram of the overall structure of the detection unit of the present invention; Figure 5 This is a schematic diagram of the internal structure of the detection unit of the present invention; Figure 6 This is a schematic diagram of the internal cross-sectional view of the detection unit of the present invention. Figure 7 This is a partial structural diagram of the sewage discharge component of the present invention; Figure 8 This is a partial structural diagram of the busbar assembly of the present invention.

[0021] In the diagram: 1. Circuit breaker; 2. Detection unit; 3. Housing; 4. Float plate; 5. Moving contact; 6. Stationary contact; 7. Combination assembly; 701. Drainage plate; 702. Drain outlet; 703. Water storage hopper; 704. Support; 705. Counterweight; 8. Sewage discharge assembly; 801. Base plate; 802. Sewage discharge trough; 803. Guide channel; 9. Filter screen; 10. Elastic element; 11. Partition plate. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Example 1 Traditional residual current circuit breakers (RCCBs) have several inherent safety defects when used outdoors, resulting in significantly insufficient protection reliability. Firstly, they exhibit delayed protection capabilities, only triggering the circuit breaker after the electrical equipment is completely submerged and a leakage fault occurs. They lack a pre-warning power-off mechanism to prevent water levels from approaching the equipment, leading to a severely delayed protection response. Secondly, after a circuit breaker trips, manual reclosing is required to verify whether it was a malfunction. However, when immediate power restoration is needed, manual investigation is impossible. Alternatively, the circuit breaker may automatically reclose to determine if a secondary trip occurred, thus requiring further investigation. Whether it is a false trip or not, if the electrical equipment is still submerged in water, forcibly turning on the electrode can easily cause serious safety accidents such as short circuit, leakage, or even electric shock. Third, the outdoor environment is complex and changeable. Large impurities such as leaves can easily adhere to and cover the moving contact 5. After the rainwater level rises, even if the moving contact 5 and the stationary contact 6 make physical contact, the closing will fail due to the obstruction of impurities, and the protection function will be rendered useless. Fourth, stones, hard debris and other debris can easily accumulate on the surface of the float plate 4. The extra weight will prevent it from rising normally with the water level, causing the power failure triggering mechanism to malfunction and inducing serious safety accidents.

[0024] This invention provides, for example Figures 1 to 8The residual current protection circuit breaker shown includes: a circuit breaking section 1 and a detection section 2. The circuit breaking section 1 is located inside the distribution box, and the detection section 2 is located outside the distribution box (as shown on the right). Figure 3 As shown), the detection unit 2 can detect the external water level normally, while preventing the circuit breaker 1 from directly contacting rainwater and causing a safety accident. The circuit breaker 1 can control the opening and closing of the entire closed circuit according to the water level detected by the detection unit 2.

[0025] The detection unit 2 includes a housing 3 and a moving contact 5 and a stationary contact 6 disposed inside the housing 3. When the moving contact 5 and the stationary contact 6 abut against each other to close the circuit, the control circuit of the circuit breaker 1 is disconnected. When the moving contact 5 and the stationary contact 6 are not abut against each other to open the circuit, the control circuit of the circuit breaker 1 is connected. The moving contact 5 and the stationary contact 6 inside the housing 3 are only low-voltage weak electrical signal contacts and do not carry the load current of the main circuit. The high-voltage contacts and the arc-extinguishing chamber of the main circuit are sealed inside the circuit breaker 1. The detection unit 2 is only used as a front-end mechanical water immersion sensor, thereby completely isolating the electrical connection between the high voltage and the water body and avoiding the risk of short circuit.

[0026] The float plate 4 is located inside the outer casing 3. It can float on the water surface and move according to the water level. When the external water level rises, the float plate 4 drives the moving contact 5 to move upward and connects with the stationary contact 6 to close the circuit.

[0027] The confluence assembly 7, located inside the housing 3, includes multiple sets of water storage hoppers 703. When it rains outside, the rainwater first accumulates inside the water storage hoppers 703, causing the center of gravity of the water storage hoppers 703 to shift. Then, the water storage hoppers 703 flip over and pour the collected rainwater onto the upper surface of the float plate 4. The float plate 4 tilts and swings, and the rainwater washes away the impurities remaining on the upper surface of the float plate 4, ensuring the normal up and down movement of the float plate 4.

[0028] The sewage discharge component 8 is located inside the housing 3 and includes a sewage discharge trough 802 and a guide trough 803. When the float 4 tilts, the guide trough 803 guides the water on the float 4 to flush the sewage discharge trough 802, so as to prevent too many impurities from accumulating inside the sewage discharge trough 802 and affecting the normal discharge of rainwater impurities.

[0029] The confluence assembly 7 also includes: a diversion plate 701, which is symmetrically arranged on the upper side of the housing 3. The upper surface of the diversion plate 701 is provided with multiple drainage slopes, which form an inverted trapezoid and the lowest point of each slope is at the same position. This is used to collect rainwater above the diversion plate 701 and gather it below the drainage slope, preventing rainwater from accumulating above the diversion plate 701 for a long time and causing damage to the structure of the housing 3; and a drain outlet 702, which is opened at the lowest point of the drainage slope on the upper surface of the diversion plate 701. The drain outlet 702 is located directly above the opening of the water storage hopper 703 in the vertical direction. Rainwater above the diversion plate 701 flows continuously into the water storage hopper 703 along the drain outlet 702. In addition, the opening area of ​​the drain outlet 702 is large and will not be blocked by external impurities. Furthermore, the equipment is regularly inspected by personnel to ensure the normal operation of the drain outlet 702.

[0030] The bracket 704 is symmetrically arranged on both sides of the water storage hopper 703 in an "L" shape. One end of the bracket 704 is fixedly connected to the lower surface of the diversion plate 701, and the other end is hinged to the side of the water storage hopper 703. A sealing protective sleeve is provided at the hinge to prevent external impurities from entering and affecting the rotation of the water storage hopper 703. A counterweight 705 is provided on each side of the water storage hopper 703 away from each other. The setting of the counterweight 705 makes the center of gravity of the water storage hopper 703 located on the side away from each other. The hinge position of the bracket 704 and the water storage hopper 703 is located on the lower side of one side of the water storage hopper 703. When the hopper is empty, the center of gravity is located at the bracket 704 and keeps the water storage hopper 703 vertical. When the hopper is full of water, the center of gravity shifts and causes the water storage hopper 703 to flip.

[0031] During rainy weather, the rainwater collected by the diversion plate 701 flows continuously into the water storage hopper 703 below through the drain outlet 702. As the rainwater accumulates in the water storage hopper 703, the overall center of gravity of the water storage hopper 703 and the rainwater gradually shifts away from the support 704. When the center of gravity exceeds the equilibrium critical point, the water storage hopper 703 quickly flips around the hinge point of the support 704 towards the float 4, thereby instantly pouring the collected rainwater onto the upper surface of the float 4. Then, under the gravity of the counterweight 705, the water storage hopper 703 rotates in the opposite direction and returns to its initial state, thus repeating the above water collection process.

[0032] Furthermore, the water storage hoppers 703 are provided with a drain outlet on the side away from each other, and the height of the drain outlet is less than the height of the water storage hoppers 703. When the float plate 4 drives the moving contact 5 and the stationary contact 6 to abut against each other to close the gate, the water storage hoppers 703 are locked by the float plate 4 and cannot be overturned. The rainwater inside the water storage hoppers 703 will be continuously discharged along the drain outlet, effectively preventing the rainwater inside the water storage hoppers 703 from being discharged above the float plate 4 and affecting the normal abutment and closing state of the moving contact 5 and the stationary contact 6.

[0033] The outer casing 3 is provided with filter screens 9 on both sides, and the drain trough 802 and the guide trough 803 are both located on one side of the filter screens 9, which are used to filter large impurities from the outside and allow rainwater to enter the interior of the outer casing 3.

[0034] Two sets of baffles 11 are symmetrically arranged on the float plate 4. The baffles 11 are located on both sides of the moving contact 5 and correspond to the guide channel 803. When the water storage hopper 703 flips over to pour the collected rainwater onto the float plate 4, the baffles 11 prevent the rainwater from washing away the moving contact 5. An insulating base is provided between the float plate 4 and the moving contact 5 to prevent the moving contact 5 from contacting the rainwater. The bottom of the stationary contact 6 is a conical opening, and the inner diameter of the conical opening is larger than the outer diameter of the moving contact 5. Therefore, when the moving contact 5 moves upward and reaches below the stationary contact 6, the corrective effect of the conical opening causes the moving contact 5 to continue moving upward and connect with the stationary contact 6. At the same time, a sponge is provided inside the cylindrical opening of the stationary contact 6 to further wipe away any impurities or rainwater that may exist on the surface of the moving contact 5 when the moving contact 5 and the stationary contact 6 come into contact with each other, ensuring that the moving contact 5 and the stationary contact 6 stably come into contact with each other and connect the circuit.

[0035] The installation height of the stationary contact 6 is lower than the minimum installation height of the other electrical equipment on the circuit. The stationary contact 6 is electrically connected to the circuit breaker 1 through the line, so that the circuit disconnection action occurs before the water level submerges the electrical equipment, preventing the power from being cut off only after the water level exceeds the electrical equipment and leakage occurs. When the water level rises to the preset height, the float plate 4 drives the moving contact 5 to close with the stationary contact 6, and the circuit breaker 1 controls the circuit and disconnects the circuit.

[0036] In summary, during actual installation and use, the residual current circuit breaker should first be fixed to the ground via the base plate 801. The installation location must strictly avoid low-lying areas. In ordinary rainy weather, low-lying areas are prone to natural water accumulation. The water level may overflow the float plate 4 before the actual external water level reaches the warning line, which may cause the float plate 4 to be lifted by buoyancy and cause the moving contact 5 and the stationary contact 6 to close erroneously. This would trigger the circuit to disconnect without cause, interfering with the normal power supply. At the same time, the installation height of the stationary contact 6 should be strictly set to be lower than the minimum installation height of all electrical equipment in the circuit. This structural approach creates a pre-disconnection foundation and avoids the safety risk of electrical equipment being energized after being submerged in water from the design source.

[0037] The base plate 801 needs to be fixed on a flat and solid ground to ensure that the equipment is installed horizontally and stably. When the water level rises during rainy days, the filter screens 9 on both sides of the outer shell 3 can block large impurities such as branches and stones from entering the interior of the shell, preventing impurities from covering the moving contact 5 and causing the closing failure. At the same time, the filter screens 9 do not obstruct the infiltration of rainwater, ensuring that rainwater can smoothly enter the interior of the outer shell 3, providing the necessary conditions for the float plate 4 to float up and drive the moving contact 5 and the stationary contact 6 to close and disconnect the power.

[0038] After the equipment is installed, it is necessary to ensure that there are no obstructions above the diversion plate 701 so that rainwater can drip onto the surface of the diversion plate 701 without obstruction. Under the counterweight of the counterweight block 705 and the limiting clamping action of the bracket 704, the opening of the water storage hopper 703 is directly below the drain outlet 702, maintaining the initial vertical balance posture, and preparing for subsequent water storage and flipping actions.

[0039] In the early stages of rainfall, before the water level rises, the drainage slope on the surface of the diversion plate 701 will direct the scattered rainwater to the drain outlet 702. The rainwater will continuously flow into the water storage hopper 703 below through the drain outlet 702. As the rainwater accumulates in the water storage hopper 703, the overall center of gravity of the water storage hopper 703 and the rainwater will gradually shift to the side away from the support 704.

[0040] When the center of gravity exceeds the critical point of equilibrium, the water storage hopper 703 quickly flips towards the float plate 4 around the hinge point of the support 704, thereby instantly pouring the collected rainwater onto the upper surface of the float plate 4. After the rainwater is poured out, the water storage hopper 703 resets under the gravity of the counterweight 705, and the opening realigns with the drain outlet 702 for the next round of water storage. This process is repeated continuously, constantly flushing away stones, debris and other impurities from the surface of the float plate 4, keeping the float plate 4 clean and free from extra weight, ensuring that when the water level rises, the float plate 4 can float smoothly under the buoyancy of the rainwater, smoothly driving the moving contact 5 to move upward. During this process, the partition 11 on the float plate 4 can prevent rainwater from directly impacting the moving contact 5, and the insulating base between the float plate 4 and the moving contact 5 further isolates the rainwater, providing double protection to keep the surface of the moving contact 5 dry and avoid abnormal conductivity caused by moisture.

[0041] When continuous heavy rainfall causes the outside water level to rise, rainwater seeps into the interior of the outer casing 3 through the filter screen 9 and accumulates. Driven by the buoyancy of the rainwater, the float plate 4 moves steadily upward, simultaneously driving the moving contact 5 to move vertically upward. As the water level continues to rise, the moving contact 5 moves upward continuously, first contacting the sponge on the surface of the stationary contact 6 and wiping away any rainwater or other impurities that may be present on the surface of the moving contact 5. Then, the moving contact 5 continues to move upward and comes into close contact with the stationary contact 6, reliably closing the circuit. The circuit breaker 1 receives the contact closing signal and cuts off the circuit. Since the stationary contact 6 is installed at a height lower than all electrical equipment, the circuit breaking action occurs before the water level submerges the electrical equipment, preventing power loss after the equipment is submerged and leaking electricity, and avoiding safety accidents such as short circuits and leakage caused by water entering the equipment and then energizing it.

[0042] As the external water level gradually rises, causing the float plate 4 to move upward, the height of the upper surface of the float plate 4 will gradually exceed the height of the water storage hopper 703. At this time, when the water storage in the water storage hopper 703 reaches the preset value and wants to flip, the sides of the water storage hopper 703 will abut against the sides of the float plate 4, thus preventing it from continuing to flip. At the same time, the rainwater inside the water storage hopper 703 will continuously be discharged through the drain outlet, preventing the water storage hopper 703 from continuing to pour rainwater onto the upper surface of the float plate 4, thereby ensuring that the float plate 4 smoothly drives the moving contact 5 and the stationary contact 6 to abut against each other. After the moving contact 5 and the stationary contact 6 abut against the closing gate, the electrical circuit of the detection unit 2 is connected and triggers the electronic alarm signal, and outputs the control command to the electromagnetic tripping mechanism of the circuit breaker 1, driving the mechanism latch of the circuit breaker 1 to perform a mechanical disconnection action, thereby disconnecting the circuit of the electrical equipment.

[0043] As the rain stops and the water recedes, the water level inside the outer casing 3 gradually decreases, and the float 4 falls back smoothly under its own weight, thereby causing the moving contact 5 to separate from the stationary contact 6. The circuit automatically resumes normal power supply, without the need for manual operation to close the circuit. This design fundamentally avoids the safety hazards of traditional circuit breakers requiring manual closure to verify whether the tripping was a malfunction, which can easily lead to the forced power supply to submerged equipment. It significantly improves the safety and stability of outdoor power supply.

[0044] Example 2 Based on the above embodiments, although the present invention has effectively solved the core problems such as pre-power-off before outdoor water level rise, safety accidents of equipment power-on when water enters, and failure of contact closing due to large impurities covering the contacts, there are still two key defects that have not been overcome. First, in outdoor environments, the filter screen 9 can only block large impurities. Small impurities can easily penetrate the filter screen 9 and enter the interior of the outer shell 3 and remain between the moving contact 5 and the stationary contact 6. When rain splashes and wets the impurities, it will form a conductive water bridge, directly causing the moving contact 5 and the stationary contact 6 to be mistakenly connected, which will then cause the circuit to trip without reason. Second, outdoor rainwater often carries a large amount of mud and sand. After the rain stops, the mud and sand can easily accumulate inside the outer shell 3. This will not only hinder the float 4 from falling back to the initial position, but will also directly contact its surface after the float 4 falls, causing the mud and sand to move upward and affecting the flexibility of the float 4 in subsequent up and down movements.

[0045] A residual current protection circuit breaker, the sewage discharge assembly 8 further includes: a base plate 801, which is disposed on the lower side of the housing 3. The upper surface of the base plate 801 is a slope that is higher in the middle and lower on both sides, that is, the height of the base plate 801 gradually decreases from the center to both sides. A sewage discharge trough 802 is opened at the bottom of the slope of the base plate 801 and close to the filter screen 9. In rainy weather, the slope of the upper surface of the base plate 801 guides impurities in the rainwater to flow into the sewage discharge trough 802. The sewage discharge trough 802 is used to temporarily collect and store impurities in the rainwater. A guide channel 803 is symmetrically opened on the upper surface of the float plate 4 and corresponds to the position of the sewage discharge trough 802. When the water storage hopper 703 flips over to pour the collected rainwater onto the float plate 4, the guide channel 803 guides the rainwater on the surface of the float plate 4 to flush the sewage discharge trough 802 and flush out the mud and sand inside the sewage discharge trough 802.

[0046] Multiple elastic elements 10 are provided above the base plate 801. The elastic elements 10 are elastic. The bottom of the float plate 4 is hinged to the upper surface of the elastic elements 10. When there is no rain, the float plate 4 squeezes the multiple elastic elements 10 under the action of gravity and moves downward to the initial position. When it rains, the rainwater applies buoyancy to the float plate 4 and moves it upward. The downward pressure applied by the float plate 4 to the elastic elements 10 decreases, and the elastic elements 10 extend upward and maintain the hinged state with the float plate 4. When the rainwater carries mud and sand to the upper surface of the float plate 4, the float plate 4 squeezes the elastic elements 10 to tilt and discharges the mud and sand obliquely, preventing the rainwater carrying mud and sand to flow to the top of the float plate 4 and continuously accumulate.

[0047] In summary, after the equipment is installed, the float plate 4 is stably supported by the evenly distributed elastic elements 10 below. A fixed space for mud and sand accumulation is reserved between the bottom surface of the float plate 4 and the base plate 801, which prevents the float plate 4 from directly contacting the mud and sand on the upper surface of the base plate 801, prevents the mud and sand from adhering and abrading the bottom of the float plate 4, and ensures that there is no jamming resistance when the float plate 4 moves up and down in the future, effectively extending the service life of the float plate 4.

[0048] Although the filters 9 on both sides of the outer shell 3 block large impurities, fine mud and sand carried by rainwater can still enter the interior of the shell. The bottom plate 801 adopts an inclined surface design. Under the action of gravity, the deposited mud and sand will flow smoothly down the slope and eventually gather and be temporarily stored in the drain trough 802 near the filter 9. This prevents mud and sand from accumulating in the corners of the bottom plate 801 and forming stubborn dirt, reducing the difficulty of later cleaning. At the same time, it ensures that the interior space of the shell is clean and prevents the accumulation of mud and sand from affecting the normal operation of various components.

[0049] At the initial stage of rainfall, before the water level rises, the confluence assembly 7 starts working simultaneously. The drainage plate 701 above the outer shell 3 quickly collects rainwater through the surface drainage slope and flows into the water storage hopper 703 below through the drain outlet 702. As the rainwater is injected, the water storage hopper 703 gradually increases in weight and its center of gravity continues to shift. After it is full of water, it quickly flips around the hinge point of the bracket 704 and instantly pours the collected rainwater onto the upper surface of the float 4. Under the instantaneous impact of the rainwater, the float 4 overcomes the supporting elastic force of the elastic element 10 and tilts downward.

[0050] After the rainwater in the water storage hopper 703 has been emptied, the water storage hopper 703 resets under the gravity of the counterweight 705, while the float plate 4 quickly bounces upward under the elastic force of the elastic element 10. This process repeats, causing the float plate 4 to continuously tilt and swing the moving contact 5 at the top, constantly changing the distance between the moving contact 5 and the stationary contact 6. The maximum swing amplitude of the float plate 4 is much smaller than the safe distance between the moving contact 5 and the stationary contact 6, preventing the moving contact 5 from swinging up and down and causing accidental closing. The swing can also shake off or destroy the cobwebs, small debris and other impurities attached to the surface of the moving contact 5 and between the moving contact 5 and the stationary contact 6, cleaning the contact surface of the moving contact 5, preventing rainwater from wetting the residual impurities and forming a conductive water bridge, preventing the circuit from tripping for no reason, and ensuring the stability of power supply.

[0051] The water storage hopper 703 flips over to pour water, which impacts the upper surface of the float plate 4. Some rainwater directly impacts the filter screen 9 through the upper surface of the float plate 4 and washes it in the opposite direction. The other part of the rainwater flows in a direction along the pre-set guide channel 803 inside the float plate 4, forming a directional water flow with a certain impact force. This water flow continuously washes away the mud and sand temporarily stored inside the sewage tank 802. The strong water flow can disperse the mud, sand and fine impurities accumulated in the sewage tank 802 and discharge them to the outside of the outer casing 3 through the filter screen 9, realizing timely cleaning of mud and sand. This ensures that there is no mud and sand accumulation or impurity residue inside the outer casing 3, providing a clean working environment for core components such as the float plate 4, moving contact 5, and stationary contact 6, avoiding corrosion and jamming of components, and ensuring that the components operate sensitively and reliably when the water level rises, further improving the overall stability and safety of the circuit breaker.

[0052] After the rain stops, the rainwater inside the outer casing 3 is discharged in the opposite direction along the filter screen 9, and the float 4, under the action of gravity, presses down on the elastic element 10 and moves it down to the initial position, and all components return to normal working condition.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A residual current protection circuit breaker, comprising a circuit breaking section (1) and a detection section (2), wherein the detection section (2) comprises a housing (3) and a moving contact (5) and a stationary contact (6) disposed inside the housing (3), characterized in that, Also includes: The float (4) is located inside the outer shell (3). When the external water level rises, the float (4) drives the moving contact (5) to move upward and connects it to the stationary contact (6). The confluence assembly (7) is located inside the outer shell (3) and includes multiple sets of water storage hoppers (703). When it rains, the rainwater is stored inside the water storage hoppers (703) and then flipped over and poured onto the upper surface of the float (4). The float (4) tilts and swings. The bus assembly (7) also includes: A diversion plate (701) is symmetrically arranged on the upper side of the outer shell (3). The upper surface of the diversion plate (701) is provided with multiple drainage slopes to collect rainwater above the diversion plate (701) and collect it below the drainage slope. The drain outlet (702) is located inside the diversion plate (701) and at the lowest point of the drainage slope. The drain outlet (702) is located directly above the opening of the water storage hopper (703) in the vertical direction. The bracket (704) is symmetrically arranged on both sides of the water storage hopper (703) and is "L" shaped. One end of the bracket (704) is fixedly connected to the lower surface of the diversion plate (701), and the other end is hinged to the side of the water storage hopper (703). The water storage hopper (703) is provided with counterweights (705) on the opposite side. The hinge position is located below the side of the water storage hopper (703) near the counterweights (705). When the hopper is empty, the center of gravity of the water storage hopper (703) is located at the bracket (704) and the water storage hopper (703) remains vertical. When the hopper is full, the center of gravity shifts and causes the water storage hopper (703) to flip. The sewage discharge assembly (8), which is located inside the housing (3), includes a sewage discharge trough (802) and a guide trough (803). When the float (4) is tilted, the guide trough (803) guides the rainwater on the upper surface of the float (4) to flush the sewage discharge trough (802). The sewage discharge assembly (8) also includes: The bottom plate (801) is located on the lower side of the outer shell (3). The upper surface of the bottom plate (801) is a slope with a high middle and low sides. The drain trough (802) is opened at the bottom of the slope of the bottom plate (801). The guide trough (803) is symmetrically opened on the upper surface of the float (4) and corresponds to the position of the drain trough (802). The bottom plate (801) guides the impurities in the rainwater to flow into the drain trough (802). The drain trough (802) is used to temporarily collect and store the impurities in the rainwater.

2. A residual current protection circuit breaker according to claim 1, characterized in that, The outer shell (3) is provided with filter screens (9) on both sides, and the drain trough (802) and the guide trough (803) are both located on one side of the filter screen (9) to filter out large impurities from the outside and allow rainwater to enter the interior of the outer shell (3).

3. A residual current protection circuit breaker according to claim 1, characterized in that, Multiple elastic elements (10) are provided above the base plate (801). The elastic elements (10) are elastic. The bottom of the float plate (4) is hinged to the upper surface of the elastic elements (10). When rainwater carries mud and sand to the upper surface of the float plate (4), the float plate (4) squeezes the elastic elements (10) to tilt and discharge the mud and sand obliquely. When the water storage bucket (703) flips over to pour the collected rainwater onto the float plate (4), the float plate (4) drives the moving contact (5) to tilt and swing up and down with the help of the elastic elements (10).

4. A residual current protection circuit breaker according to claim 1, characterized in that, Two sets of baffles (11) are symmetrically arranged on the float (4). The baffles (11) are located on both sides of the moving contact (5) and correspond to the guide channel (803). When the water storage bucket (703) flips over to pour the collected rainwater onto the float (4), the baffles (11) prevent the rainwater from washing away the moving contact (5). An insulating base is provided between the float (4) and the moving contact (5).

5. A residual current protection circuit breaker according to claim 1, characterized in that, The installation height of the stationary contact (6) is lower than the minimum installation height of the other electrical equipment on the circuit. The stationary contact (6) is electrically connected to the circuit breaker (1) through the line. When the water level rises to the preset height, the float (4) drives the moving contact (5) to move upward and close the circuit with the stationary contact (6). The circuit breaker (1) disconnects the circuit.

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