Low voltage distribution box with integrated switch
By forming a dual-circuit parallel power supply structure through an integrated circuit breaker, combined with mechanical linkage and a continuously adjustable power distributor, the problem that traditional low-voltage distribution boxes cannot drive high-power emergency loads is solved, and safe and reliable emergency power supply is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FUZHOU SUNRAY ELECTRIC
- Filing Date
- 2026-05-09
- Publication Date
- 2026-06-19
AI Technical Summary
Traditional low-voltage distribution boxes cannot use small-capacity switches to drive high-power emergency loads, and their protection thresholds are not adjustable, resulting in low safety and reliability.
An integrated circuit breaker is used to form a dual-circuit parallel power supply. Combined with mechanical linkage and a continuously adjustable power distributor, it enables a small-capacity switch to drive a high-power emergency load, and is equipped with a linkage mechanism to synchronously disconnect the power supply path.
It enables small-capacity switches to drive high-power emergency loads, and the total tripping power is continuously adjustable, improving the safety, versatility and economy of the power distribution system.
Smart Images
Figure CN122246581A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of low-voltage power distribution equipment technology, specifically to a low-voltage distribution box with an integrated switch, capable of driving high-power emergency loads with a small-capacity switch and having continuously adjustable power distribution function. Background Technology
[0002] Traditional low-voltage distribution boxes typically consist of a main circuit breaker and multiple parallel sub-circuit breakers. Each sub-circuit breaker can only provide a single power output, and its load capacity is strictly limited by the rated capacity of the switch itself. When power is needed for high-power emergency loads, larger capacity circuit breakers must be replaced, which is costly, complex to modify, and affects the timeliness of power supply repairs.
[0003] In the existing technology, some distribution boxes use integrated circuit breakers. Although integrated circuit breakers combine knife switches and circuit breakers, the knife switches and circuit breakers are set in series to realize single-circuit dual switching to improve its closing safety. However, it is still a single-circuit output, and its distribution circuit protection threshold is fixed. It cannot continuously and accurately adjust the tripping power according to the rated power of different emergency loads, resulting in poor versatility.
[0004] Therefore, existing low-voltage distribution boxes have problems such as: inability to use small-capacity switches to drive high-power emergency loads, unadjustable protection thresholds, and low safety and reliability. Summary of the Invention
[0005] In view of the above problems, this application provides a low-voltage distribution box with an integrated switch to solve the above technical problems. It forms a dual parallel power supply through an integrated circuit breaker, and with the cooperation of mechanical linkage and continuously adjustable power distributor, it realizes that a small-capacity switch can drive a high-power emergency load, the total tripping power is continuously adjustable, and the dual circuits are synchronously disconnected in case of a fault, thereby improving the safety, versatility and economy of the power distribution system.
[0006] To achieve the above objectives, the inventors provide a low-voltage distribution box with an integrated switch, including a box body, a main circuit breaker, and multiple sub-circuit breakers, wherein the output terminals of the main circuit breaker are connected in parallel to the multiple sub-circuit breakers; wherein at least one of the sub-circuit breakers is an integrated circuit breaker consisting of a disconnector and a circuit breaker connected in series.
[0007] The integrated circuit breaker forms a dual-path synchronous emergency power supply structure through a first power supply path, a second power supply path, and a linkage mechanism: the first power supply path is directly connected to the emergency load from the circuit breaker output terminal via a first conductor; the second power supply path is directly connected to the same emergency load from the intermediate node between the integrated circuit breaker's disconnector output terminal and the circuit breaker input terminal via a second conductor; the current in the second power supply path does not pass through the circuit breaker, enabling the integrated circuit breaker with a small rated current to supply power to a higher-power emergency load; the linkage mechanism connects the disconnector and the circuit breaker's closing button. When the circuit breaker causes the closing button to trip due to overload, the linkage mechanism drives the disconnector to open synchronously, disconnecting both the first and second power supply paths from the emergency load simultaneously.
[0008] Furthermore, a dual-path continuously adjustable power distributor is provided between the first conductor and the second conductor. The continuously adjustable power distributor can continuously adjust the resistance of the first power supply path and the second power supply path to adjust the power distribution ratio and realize the continuous adjustment of the total tripping power of the emergency power supply circuit.
[0009] Furthermore, the dual-channel power continuously adjustable distributor adopts a single-knob coaxial double-slide wire rheostat; the single-knob coaxial double-slide wire rheostat includes a first resistor unit and a second resistor unit, the two sets of resistor units are coaxially driven by the same adjustment knob and realize reverse synchronous adjustment; the first resistor unit is connected in series in the first power supply path, the second resistor unit is connected in series in the second power supply path, and rotating the adjustment knob can realize continuous stepless adjustment of the power ratio of the two power supplies.
[0010] Furthermore, the linkage mechanism includes a closing driven swing arm, a disconnector rocker arm, and a linkage link; the closing driven swing arm is installed on the side of the closing button, the disconnector rocker arm is installed on the operating shaft of the disconnector, and the two ends of the linkage link are respectively hinged to the closing driven swing arm and the disconnector rocker arm, forming a linkage transmission structure.
[0011] Furthermore, when the circuit breaker closing button is pressed to close the circuit, the closing driven swing arm pushes the knife switch rocker arm to rotate through the linkage rod, causing the knife switch and the circuit breaker to close synchronously; when the circuit breaker trips due to overload or short circuit and the closing button pops back, the closing driven swing arm pulls the knife switch rocker arm to rotate in the opposite direction through the linkage rod, causing the knife switch and the circuit breaker to open synchronously.
[0012] Furthermore, the enclosure is provided with a wire trough and an insulating fixing bracket; the first wire and the second wire are fixedly arranged along the wire trough, and the single-knob coaxial double-slide rheostat is installed in the enclosure through the insulating fixing bracket, with its adjustment knob extending to the outside of the enclosure panel.
[0013] Furthermore, the rated current of the main circuit breaker is greater than or equal to 400A, and the rated current of the integrated circuit breaker is less than or equal to 100A.
[0014] Furthermore, the emergency load is another nearby low-voltage distribution box. The dual-path synchronous emergency power supply structure is connected to the other low-voltage distribution box via a quick-break switch. When the quick-break switch detects that the other low-voltage distribution box has resumed power supply, the quick-break switch disconnects.
[0015] Furthermore, the enclosure is also equipped with a voltmeter and an ammeter to detect the voltage and current of the low-voltage distribution box.
[0016] Unlike existing technologies, the low-voltage distribution box with integrated switch described above includes a box body, a main circuit breaker, and multiple sub-circuit breakers connected in parallel to the output of the main circuit breaker. At least one sub-circuit breaker is an integrated circuit breaker consisting of a disconnector and a circuit breaker connected in series. This integrated circuit breaker has two emergency power supply paths. The first power supply path connects the emergency load from the output of the circuit breaker via a first conductor. The second power supply path connects the emergency load from the intermediate node between the disconnector and the circuit breaker via a second conductor, and the current does not pass through the circuit breaker. The first and second power supply paths supply power to the same emergency load. A dual-path continuously adjustable power distributor is provided between the first and second conductors. The integrated circuit breaker is also equipped with a linkage mechanism that can drive the disconnector to open synchronously when the circuit breaker closes due to overload, thus disconnecting both power supply paths simultaneously. This technical solution allows a small-sized integrated circuit breaker to be adapted to a larger power emergency load without replacing it with a high-rated current circuit breaker, reducing equipment configuration costs. Furthermore, the dual-circuit continuously adjustable power distributor can adapt to the power requirements of different emergency loads, enabling flexible adjustment of the total tripping power of the emergency power supply circuit. In addition, the circuit breaker can control the simultaneous disconnection of the disconnect switches through a linkage mechanism, completely avoiding the safety hazard of a single circuit being energized after the circuit breaker trips, while improving the adaptability, flexibility, and safety of emergency power supply.
[0017] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description
[0018] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of the present invention and other related contents, and should not be considered as limitations on this application.
[0019] In the accompanying drawings of the instruction manual:
[0020] Figure 1 This is a schematic diagram of the external structure of the low-voltage distribution box with an integrated switch as described in a specific embodiment.
[0021] Figure 2 This is a schematic diagram of the internal structure of a low-voltage distribution box with an integrated switch as described in a specific embodiment.
[0022] Figure 3 for Figure 2 A magnified view of part A in the middle;
[0023] Figure 4 This is a schematic diagram of the integrated circuit breaker described in a specific embodiment;
[0024] Figure 5 This is a schematic diagram of the internal structure of the integrated circuit breaker described in a specific embodiment;
[0025] Figure 6 A module block diagram of the dual-path synchronous emergency power supply structure formed by the integrated circuit breaker described in the specific implementation method;
[0026] Figure 7 This is a schematic diagram illustrating the emergency power supply from one low-voltage distribution box to another, as described in a specific implementation method.
[0027] The reference numerals used in the above figures are explained as follows:
[0028] 1. Enclosure; 11. Enclosure door; 12. Observation window; 13. Cable inlet;
[0029] 2. Main circuit breaker; 3. Sub-circuit breaker; 4. Integrated circuit breaker;
[0030] 41. Disconnect switch; 411. Operating handle; 42. Circuit breaker; 421. Closing button;
[0031] 44. Dual-channel continuously adjustable power distributor; 441. First resistor unit; 442. Second resistor unit;
[0032] 45. Linkage mechanism; 46. First guide wire; 47. Second guide wire;
[0033] 400. Integrated insulating base; 401. Knife switch input terminal; 402. Common terminal; 403. Circuit breaker output terminal;
[0034] 451. Closing driven swing arm; 452. Linkage rod; 453. Disconnector rocker arm; Detailed Implementation
[0035] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.
[0036] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.
[0037] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.
[0038] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.
[0039] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.
[0040] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.
[0041] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.
[0042] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0043] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.
[0044] Please see Figures 1 to 7This embodiment of the low-voltage distribution box with integrated switch can be widely used in various scenarios in the power grid system that require emergency power supply, flexible load power adaptation, and high safety and reliability requirements, including but not limited to: backup power supply circuits for key equipment in industrial production workshops, emergency lighting and fire-fighting equipment power supply systems in commercial complexes, emergency power supply networks for public areas in residential communities, mobile power supply devices for outdoor temporary operations, emergency power supply circuits for basic medical equipment in medical facilities, power supply systems for auxiliary equipment at data center edge nodes, and village-level distribution terminals with large load fluctuations in rural power grid transformation. Compared with existing technologies, its core improvement lies in constructing dual emergency power supply paths through an integrated circuit breaker, adding dual-path continuously adjustable power distributors, and configuring linkage mechanisms. The corresponding technical effects can be summarized as: significantly improving emergency load adaptability and power supply flexibility, effectively eliminating the safety hazards of single-path energization, reducing equipment configuration and maintenance costs, while enhancing overall operational reliability and adapting to diverse emergency power supply needs of power grid terminals.
[0045] Please see Figure 1 and Figure 2 As shown, this embodiment of the low-voltage distribution box with an integrated switch includes a box body 1, a main circuit breaker 2, and multiple sub-circuit breakers 3. The input terminal of the main circuit breaker 2 is connected to the low-voltage power supply of the grid, and the output terminal of the main circuit breaker 2 is connected in parallel to the multiple sub-circuit breakers 3. At least one of the sub-circuit breakers 3 is an integrated circuit breaker 4 composed of a knife switch 41 and a circuit breaker 42 connected in series. The integrated circuit breaker 4 serves as a dedicated emergency power supply circuit, while the remaining sub-circuit breakers 3 serve as conventional load power supply circuits. Each power supply circuit is independently wired, mutually insulated, and does not interfere with each other. The box body 1 is equipped with an openable door 11, and the door 11 is equipped with an observation window 12. The side wall of the box body 1 is equipped with a cable inlet 13, through which the power supply cable of the grid enters the box body 1 and connects to the main circuit breaker 2.
[0046] like Figure 4 and Figure 5As shown, the integrated circuit breaker 4 mainly consists of a knife switch 41, a circuit breaker 42 (i.e., a miniature circuit breaker 42), an integrated insulating base 400, and a flame-retardant housing. The integrated insulating base 400 serves as the overall load-bearing foundation, integrally molded from insulating and flame-retardant material. It provides a fixed mounting position for the knife switch 41 and the circuit breaker 42, as well as an internal wiring cavity and terminal block arrangement structure, enabling the integrated assembly of the knife switch 41 and the circuit breaker 42. The flame-retardant housing covers the outside of the integrated insulating base 400, providing insulation protection, dust prevention, and protection against accidental contact with internal components. The knife switch 41 is a manually operated disconnecting switch, equipped with an operating handle 411, moving and stationary contacts, and a clearly visible break point. It primarily serves to provide electrical isolation and physical disconnection during line maintenance. The input terminal 401 of the disconnect switch is connected to the output terminal of the main circuit breaker. The circuit breaker 42 and the disconnect switch 41 are integrated in series along the power supply circuit and arranged on the same integrated insulating base 400. As the core component for circuit overload and short circuit protection, the two are integrated into one unit and do not need to be arranged and installed separately, which is suitable for the modular assembly requirements of low voltage distribution boxes.
[0047] In this embodiment, the circuit breaker 42 is a conventional circuit breaker 42, which mainly includes moving and stationary contacts, a circuit breaker output terminal 403, an operating closing mechanism, a thermal trip bimetallic strip, an electromagnetic trip unit, a mechanical trip locking mechanism, and a closing button 421 (i.e., a closing reset button). The operating closing mechanism, the thermal trip bimetallic strip, the electromagnetic trip unit, and the mechanical trip locking mechanism all employ conventional technical means for circuit breakers 42 in the art.
[0048] When an overload occurs in the circuit of circuit breaker 42, the circuit current continuously exceeds the rated current of circuit breaker 42. The bimetallic strip undergoes continuous bending deformation due to long-term heating, which in turn pushes the mechanical tripping locking mechanism to unlock. Under the action of the internal energy storage spring, circuit breaker 42 automatically disconnects the moving and stationary contacts to trip. After tripping, the closing button 421 automatically returns to its original position. If a short circuit fault occurs, the ultra-large instantaneous current will drive the electromagnetic trip device to act instantaneously, quickly unlocking the tripping mechanism to achieve instantaneous tripping and complete short circuit protection.
[0049] like Figure 2 , Figure 3 and Figure 6As shown, in this embodiment, a dual-path synchronous emergency power supply structure is formed by improving the connection method of the integrated circuit breaker 4 and adding a linkage mechanism 45. Specifically, the integrated circuit breaker 4 forms a dual-path synchronous emergency power supply structure through a first power supply path, a second power supply path, and a linkage mechanism 45. The first power supply path connects the output terminal 403 of the integrated circuit breaker 4 directly to the emergency load via a first conductor 46; the second power supply path connects the common terminal 402 (i.e., the intermediate node between the output terminal of the disconnector 41 and the input terminal of the circuit breaker 42) directly to the same emergency load via a second conductor 47. It should be noted that the first and second power supply paths, which are connected in parallel, supply power to the same emergency load; therefore, their total power is the sum of the power of the first power supply path and the power of the second power supply path. Furthermore, the current in the second power supply path does not pass through the circuit breaker 42; therefore, the integrated circuit breaker 4 only needs to carry the current of the first power supply path to enable the integrated circuit breaker 4 with a small rated current to supply power to a larger power emergency load.
[0050] like Figure 2 and Figure 6 As shown, a dual-path continuously adjustable power distributor 44 is provided between the first conductor 46 and the second conductor 47. This continuously adjustable power distributor can continuously adjust the resistance of the first power supply path and the second power supply path to adjust the power distribution ratio, thereby achieving continuous adjustment of the total tripping power of the emergency power supply circuit. The continuously adjustable power distributor uses a single-knob coaxial double-slide-wire rheostat.
[0051] like Figure 6 As shown, the single-knob coaxial dual-slide rheostat includes a first resistor unit 441 and a second resistor unit 442. Each set of resistor units can be equipped with multiple resistors of the same resistance, which are connected in series with each wire of the first power supply path and the second power supply path, respectively. The two sets of resistor units are coaxially driven by the same adjustment knob and achieve reverse synchronous adjustment. The first resistor unit 441 is connected in series with the first power supply path, and the second resistor unit 442 is connected in series with the second power supply path; rotating the adjustment knob can achieve continuous stepless adjustment of the power ratio of the two power supplies.
[0052] like Figure 3As shown, the linkage mechanism 45 includes a closing driven swing arm 451, a disconnector rocker arm 453, a linkage rod 452, and a reset torsion spring. The closing driven swing arm is installed on the side of the closing button 421 of the circuit breaker 42, and the disconnector rocker arm 453 is installed on the operating shaft of the disconnector 41. The two ends of the linkage rod are respectively hinged to the closing driven swing arm and the disconnector rocker arm 453, forming a purely mechanical linkage transmission structure; a reset torsion spring is installed on the operating shaft of the disconnector 41. When the closing button 421 of the circuit breaker 42 is manually pressed, the closing driven swing arm pushes the disconnector rocker arm 453 to rotate through the linkage rod, causing the disconnector 41 and the circuit breaker 42 to close synchronously, and the first power supply path and the second power supply path simultaneously supply power to the emergency load. When an emergency load experiences an overload or short-circuit fault, the internal tripping mechanism of circuit breaker 42 activates, tripping circuit breaker 42 and resetting the closing button 421. The closing driven swing arm pulls the disconnector rocker arm 453 in the opposite direction via the linkage rod, causing disconnector 41 to open synchronously with circuit breaker 42. At the same time, the reset torsion spring assists disconnector 41 to automatically return to the fully open position, ensuring that the first power supply path and the second power supply path are completely disconnected simultaneously, avoiding safety hazards caused by continuous power supply from a single path.
[0053] like Figure 7 The diagram shown illustrates an embodiment where a low-voltage distribution box provides emergency power to another low-voltage distribution box. The dual-path synchronous emergency power supply structure is connected to the other low-voltage distribution box via a short-circuit switch. When the short-circuit switch detects that the other low-voltage distribution box has resumed power supply, the short-circuit switch disconnects, thus achieving seamless switching between emergency power supply and original power supply.
[0054] In this embodiment, a dual-path emergency power supply structure is formed by the integrated circuit breaker 4. The second power supply path does not pass through the circuit breaker 42, allowing the small-rated integrated circuit breaker 4 to carry a larger power emergency load without replacing it with a large-capacity switch, reducing costs and modification difficulty. It can also quickly provide temporary power to high-power emergency loads. Furthermore, the power distribution is continuously adjustable through the dual-path continuously adjustable power distributor 44, and the total tripping power can be precisely set according to different emergency loads, making it highly versatile and adaptable.
[0055] Assumption: The rated allowable power of the integrated circuit breaker 4 is Pe;
[0056] The power of the first power supply path is PA (since the allowable current of the disconnector 41 is much greater than that of the circuit breaker 42, PA is actually equal to Pe).
[0057] The power of the second power supply path is PB;
[0058] Power ratio K = PB / PA;
[0059] The total overload tripping power P_total of the dual-path synchronous emergency power supply structure formed by the integrated circuit breaker 4 is P_total = PA + PB = Pe × (1 + K).
[0060] Since the first power supply path and the second power supply path are connected in parallel and have the same voltage, the power distribution ratio is inversely proportional to the resistance distribution ratio.
[0061] When the single-knob coaxial double-slide-wire rheostat is rotated, the first resistor unit 441 and the second resistor unit 442 change in opposite directions: when the knob is rotated, the resistance of the first resistor unit 441 increases, and the resistance of the second resistor unit 442 decreases simultaneously, i.e., PA decreases and PB increases; when the knob is rotated in the opposite direction, the resistance of the first resistor unit 441 decreases, and the resistance of the second resistor unit 442 increases simultaneously, i.e., PA increases and PB decreases. Therefore, by adjusting the knob rotation, the power distribution ratio can be continuously adjusted, thereby achieving continuous adjustment of the total overload tripping power.
[0062] The power regulation steps of the dual-circuit synchronous emergency power supply structure formed by the integrated circuit breaker 4 are as follows:
[0063] 1) Determine the required total tripping power P_total based on the rated power of the emergency load;
[0064] 2) Calculate the required power ratio K using the formula K = (P_total / Pe) - 1;
[0065] 3) Rotate the adjustment knob on the outside of the panel of housing 1 to change the resistance ratio of the two circuits of the single-knob coaxial double slide wire rheostat.
[0066] 4) The two resistors change in opposite directions synchronously, so that PA and PB are continuously distributed according to the set ratio;
[0067] 5) After the adjustment is completed, the integrated circuit breaker 4 will trip accurately when the total power reaches P_total.
[0068] The following is a typical adjustment example:
[0069] Assume the rated allowable power of the integrated circuit breaker 4 is Pe = 1000W.
[0070] When the power ratio PA : PB = 2 : 1;
[0071] K = PB / PA = 1 / 2 = 0.5;
[0072] P_total = 1000W × (1 + 0.5) = 1500W;
[0073] When the total power of the emergency load exceeds 1500W, the power PA of the first power supply path reaches 1000W. At this time, the circuit breaker 42 trips and drives the knife switch 41 to disconnect through the linkage mechanism 45, realizing the synchronous disconnection of the two circuits.
[0074] When the power ratio PA : PB = 1 : 1;
[0075] K = PB / PA = 1;
[0076] P_total = 1000W × (1 + 1) = 2000W;
[0077] When the total power of the emergency load exceeds 2000W, the power PA of the first power supply path reaches 1000W, and the circuit breaker 42 trips.
[0078] When the power ratio PA : PB = 2 : 3;
[0079] K = PB / PA = 3 / 2 = 1.5;
[0080] P_total = 1000W × (1 + 1.5) = 2500W;
[0081] When the total power of the emergency load exceeds 2500W, the power PA of the first power supply path reaches 1000W, and the circuit breaker 42 trips.
[0082] The housing 1 is equipped with a wire trough and an insulating fixing bracket; the first wire 46 and the second wire 47 are fixedly arranged along the wire trough, and the single-knob coaxial double sliding rheostat is installed in the housing 1 through the insulating fixing bracket, and its adjustment knob extends to the outside of the panel of the housing 1 to realize external visual adjustment.
[0083] In this embodiment, the shortcomings of existing low-voltage distribution boxes that rely solely on the output of a single circuit breaker 42 for emergency power supply and are limited by rated current and cannot adapt to high-power loads are improved. By adopting an integrated circuit breaker 4 composed of a knife switch 41 and a circuit breaker 42 connected in series and designing a dual emergency power supply path, the second power supply path draws power from the intermediate node between the knife switch 41 and the circuit breaker 42 and the current does not pass through the circuit breaker 42. This allows a small rated current switch to drive a larger power emergency load without replacing the circuit breaker 42 with a larger one. This reduces the cost of equipment configuration and modification, reduces the overall size of the distribution box, and greatly improves the versatility and adaptability of the equipment.
[0084] To address the issue that existing dual-path emergency power supply systems have a fixed power ratio and cannot adapt to the load power requirements under different operating conditions, a dual-path continuously adjustable power distributor 44 is added between the conductors of the two power supply paths. This allows for flexible adjustment of the power distribution ratio between the two power supplies, enabling continuous adjustment of the total tripping power of the emergency power supply circuit. This effectively adapts to the diverse emergency load power requirements under different scenarios, improving the flexibility and practicality of the power supply system.
[0085] Overcoming the safety hazards of existing technologies where the disconnector 41 and circuit breaker 42 are mostly operated independently, and the disconnector 41 may remain closed after the circuit breaker 42 trips, resulting in a single circuit being energized, the integrated circuit breaker 4 is equipped with a linkage mechanism 45. When the circuit breaker 42 trips due to overload or short circuit and the closing button 421 returns, the linkage mechanism 45 can simultaneously drive the disconnector 41 to open, ensuring that both power supply paths are disconnected at the same time. This completely eliminates the safety risk of residual energization and significantly improves the safety protection level of the distribution box.
[0086] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.
Claims
1. A low-voltage distribution box with an integrated switch, comprising a box body, a main circuit breaker, and multiple sub-circuit breakers, characterized in that: The output terminal of the main circuit breaker is connected in parallel to multiple sub-circuit breakers; at least one of the sub-circuit breakers is an integrated circuit breaker consisting of a disconnector and a circuit breaker connected in series. The integrated circuit breaker forms a dual-path synchronous emergency power supply structure through a first power supply path, a second power supply path, and a linkage mechanism: the first power supply path is directly connected to the emergency load from the circuit breaker output terminal via a first conductor; the second power supply path is directly connected to the same emergency load from the intermediate node between the integrated circuit breaker's disconnector output terminal and the circuit breaker input terminal via a second conductor; the current in the second power supply path does not pass through the circuit breaker, enabling the integrated circuit breaker with a small rated current to supply power to a higher-power emergency load; the linkage mechanism connects the disconnector and the circuit breaker's closing button. When the circuit breaker causes the closing button to trip due to overload, the linkage mechanism drives the disconnector to open synchronously, disconnecting both the first and second power supply paths from the emergency load simultaneously.
2. A low-voltage distribution box with an integrated switch according to claim 1, characterized in that: A dual-path continuously adjustable power distributor is provided between the first conductor and the second conductor. The continuously adjustable power distributor can continuously adjust the resistance of the first power supply path and the second power supply path to adjust the power distribution ratio and realize the continuous adjustment of the total tripping power of the emergency power supply circuit.
3. The low-voltage distribution box with integrated switch according to claim 2, characterized in that: The dual-channel power continuously adjustable distributor adopts a single-knob coaxial double-slide wire rheostat; the single-knob coaxial double-slide wire rheostat includes a first resistor unit and a second resistor unit, and the two sets of resistor units are coaxially driven by the same adjustment knob and realize reverse synchronous adjustment. The first resistor unit is connected in series in the first power supply path, and the second resistor unit is connected in series in the second power supply path. By rotating the adjustment knob, the power ratio of the two power supplies can be continuously and steplessly adjusted.
4. The low-voltage distribution box with integrated switch according to claim 1, characterized in that: The linkage mechanism includes a closing driven swing arm, a disconnector rocker arm, and a linkage link; the closing driven swing arm is installed on the side of the closing button, the disconnector rocker arm is installed on the operating shaft of the disconnector, and the two ends of the linkage link are respectively hinged to the closing driven swing arm and the disconnector rocker arm, forming a linkage transmission structure.
5. The low-voltage distribution box with integrated switch according to claim 4, characterized in that: When the circuit breaker closing button is pressed to close the circuit, the closing driven swing arm pushes the disconnector rocker arm to rotate through the linkage rod, causing the disconnector and the circuit breaker to close synchronously. When the circuit breaker trips due to overload or short circuit and the closing button pops back, the closing driven swing arm pulls the disconnector rocker arm to rotate in the opposite direction through the linkage rod, causing the disconnector and the circuit breaker to open synchronously.
6. The low-voltage distribution box with integrated switch according to claim 3, characterized in that: The enclosure is equipped with a wire trough and an insulating fixing bracket; the first wire and the second wire are fixedly arranged along the wire trough, and the single-knob coaxial double sliding rheostat is installed in the enclosure through the insulating fixing bracket, with its adjustment knob extending to the outside of the enclosure panel.
7. The low-voltage distribution box with integrated switch according to claim 3, characterized in that: The rated current of the main circuit breaker is greater than or equal to 400A, and the rated current of the integrated circuit breaker is less than or equal to 100A.
8. The low-voltage distribution box with integrated switch according to claim 1, characterized in that: The emergency load is another nearby low-voltage distribution box. The dual-path synchronous emergency power supply structure is connected to the other low-voltage distribution box via a quick-break switch. When the quick-break switch detects that the other low-voltage distribution box has resumed power supply, the quick-break switch disconnects.
9. The low-voltage distribution box with integrated switch according to claim 1, characterized in that: The enclosure is also equipped with a voltmeter and an ammeter to detect the voltage and current of the low-voltage distribution box.