A circuit breaker integrated with an adjustable hydraulic trip unit

Abstract

The application discloses a circuit breaker integrated with an adjustable hydraulic release device, and contains a circuit breaker body with an embedded adjustable hydraulic release device, a release drive mechanism and a main contact system. The adjustable hydraulic release device comprises a release device body and an intelligent control module; the release device body is provided with an oil cup, an axially movable oil cup core, an armature, a first coil and an armature, and the armature is linked with the release drive mechanism. When the first coil is electrified, a first electromagnetic force is generated, the oil cup core is pushed to move towards the armature, and finally the armature is attracted to trigger a release action to break the circuit. The intelligent control module is located at the end of the oil cup, can generate a second electromagnetic force acting on the oil cup core in the same direction or in the opposite direction of the first electromagnetic force, and realizes rated current regulation and overload protection regulation. The design not only overcomes the problem that the protection characteristics of the traditional hydraulic electromagnetic release device are fixed, but also changes the equivalent synthetic ampere-turns by using the controllable second electromagnetic force, flexibly adjusts the rated current, and meets different equipment requirements.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of circuit breakers, and particularly relates to a circuit breaker integrated with an adjustable hydraulic release. BACKGROUND

[0002] With the development of power systems and the increasing requirements of users on the safety performance of electrical equipment, as a key component of circuit protection, the performance of circuit breakers directly affects the stability and safety of the entire power system.

[0003] At present, circuit breakers use releases to realize overcurrent protection functions, however, the traditional releases have certain limitations in actual application.

[0004] 1. Thermal-electromagnetic release:

[0005] Temperature sensitivity: The working characteristics of the thermal-electromagnetic release are highly dependent on the environmental temperature, especially under extreme temperature conditions (such as below -40℃ or above +85℃), the working stability will be significantly affected, resulting in changes in protection characteristics, thereby affecting the reliability of the circuit breaker.

[0006] Limited rated current specifications: Due to design limitations, circuit breakers using thermal-electromagnetic releases can only provide limited rated current specification options, which cannot meet the needs of multiple selectable current protection for the same circuit breaker in specific situations, which limits its applicability in different application scenarios.

[0007] 2. Electronic release:

[0008] Cost and volume problems: Although the electronic release can realize more rated current specifications and can adjust the overcurrent release multiple within a certain range, its high cost and large volume become the main obstacle to its widespread application.

[0009] In addition, electronic components are sensitive to environmental conditions (such as humidity and vibration), which may affect the reliability of long-term use.

[0010] 3. Traditional hydraulic electromagnetic release:

[0011] Non-adjustable protection characteristics: Although the traditional hydraulic electromagnetic release can work reliably within a wide temperature range (-40℃ to +85℃) and has good rated current setting accuracy, its overcurrent protection characteristics are usually fixed and cannot be adjusted according to specific application requirements, which limits its application effect in scenarios that require flexible adjustment of protection characteristics. SUMMARY

[0012] The application is aimed at the above-mentioned problems existing in the prior art, and provides an adjustable circuit breaker integrated with an adjustable hydraulic release device, which has an overload protection adjustable function and the adjustable function of the overload protection is not affected by temperature.

[0013] The application can be implemented by the following technical solutions:

[0014] An adjustable circuit breaker integrated with an adjustable hydraulic release device comprises:

[0015] A circuit breaker body, which is internally provided with an adjustable hydraulic release device, a release driving mechanism and a main contact system;

[0016] The adjustable hydraulic release device comprises a release device body and an intelligent control module, wherein,

[0017] The release device body is provided with an oil cup, an axially movable oil cup core, an armature shoe arranged at the end of the oil cup, a first coil arranged on the outer wall of the oil cup and an armature, and the armature is connected with the release driving mechanism in linkage;

[0018] The first coil generates a first electromagnetic force after being electrified, which drives the oil cup core to move towards the armature shoe, when the oil cup core moves close to the armature shoe, the first electromagnetic force attracts the armature to rotate, and triggers the release driving mechanism to rotate to break the main contact system;

[0019] The intelligent control module is arranged at the end of the oil cup, and is used for generating a second electromagnetic force acting on the oil cup core in the same direction or opposite direction of the first electromagnetic force, and the direction and size of the second electromagnetic force are adjusted to realize:

[0020] Rated current adjustment: actively adjusting to equivalently change the total ampere turns of the first coil;

[0021] Overload protection adjustment: based on the real-time current of the first coil, automatically adjusting the direction and size of the second electromagnetic force to dynamically control the time when the oil cup core moves to the armature shoe;

[0022] The intelligent control module is configured to:

[0023] A control core, which is close to the end surface of the oil cup core;

[0024] A second coil, which is arranged outside the control core;

[0025] A direct current power supply module, which is electrically connected with the second coil, and outputs a set current through the direct current power supply module, so that the second coil generates a specific direct current magnetic flux and magnetizes the control core, and the control core generates the second electromagnetic force on the oil cup core;

[0026] Or the intelligent control module is configured to:

[0027] A second coil is arranged outside the oil cup core;

[0028] A direct current power module is electrically connected with the second coil, and a set current is outputted through the direct current power module to make the second coil generate a specific direct current magnetic flux, and the direct current magnetic flux forms the second electromagnetic force applied to the oil cup core.

[0029] As a further improvement of the present application, silicon oil is filled in the oil cup, and the flow of the silicon oil generates a physical damping force for the movement of the oil cup core during the axial movement of the oil cup core;

[0030] The second electromagnetic force generated by the intelligent control module generates an adjustable electromagnetic force for the movement of the oil cup core.

[0031] As a further improvement of the present application, the physical damping force and the adjustable electromagnetic force are superimposed to form a combined force, and the combined force accelerates or delays the time of the movement of the oil cup core to the direction of the pole shoe.

[0032] As a further improvement of the present application, the tripping transmission mechanism comprises:

[0033] A rotating frame is connected with an external operating handle;

[0034] A tripping bracket is arranged in the rotating frame and connected with the rotating frame;

[0035] A tripping piece and a rotating shaft are arranged in the rotating frame, the tripping piece is sleeved on the rotating shaft and connected with the armature in linkage;

[0036] A tripping plate is hingedly connected at one end with the rotating frame and at the other end with the tripping bracket and the rotating shaft to form a locking fit therebetween.

[0037] As a further improvement of the present application, the tripping piece has a first tripping part and a second tripping part, the first tripping part is connected with the armature in linkage, and the second tripping part is connected with the tripping plate in linkage.

[0038] As a further improvement of the present application, the tripping plate is provided with a tripping groove and has a locking position and a tripping position, wherein,

[0039] When the tripping plate is in the locking position, the second tripping part abuts against the outer wall of the tripping plate to limit the rotation of the tripping plate, the tripping bracket extends into the tripping groove and abuts against the tripping plate, and at this time the tripping plate limits the rotation of the tripping bracket;

[0040] When the trip plate is switched to the tripping position, the armature is attracted and pushes the first tripping part to rotate the tripping piece, the second tripping part is rotated to the position where the trip slot is located to release the limit of the trip plate, the trip plate is rotated to the second tripping part and makes the trip bracket out of the trip slot.

[0041] As a further improvement of the application, the rotating frame is further connected with:

[0042] A movable contact bracket for mounting movable contacts, the movable contacts form a main contact system with fixedly mounted stationary contacts;

[0043] A connecting rod, two ends of which are connected with the movable contact bracket and the rotating frame respectively;

[0044] A trip spring, one end of which is connected with the top of the rotating frame, and the other end is connected with the end of the connecting rod for connecting with the rotating frame;

[0045] When the trip plate is switched to the tripping position, the trip spring pulls the connecting rod and the movable contact bracket upward to separate the movable contacts from the stationary contacts.

[0046] As a further improvement of the application, the circuit breaker body is further provided with an arc extinguishing chamber, the arc extinguishing chamber is composed of multiple layers of arc extinguishing grids, the main contact system is located in the arc extinguishing chamber, and the high-voltage arc generated when the main contact system is disconnected is extinguished by the arc extinguishing grids.

[0047] Compared with the prior art, the application has the following beneficial effects.

[0048] 1. Flexible adjustment of protection characteristics, taking into account high reliability and intelligence: the second electromagnetic force (generated by the intelligent control module) is introduced into the adjustable hydraulic electromagnetic trip device built in the circuit breaker body, which can dynamically adjust the overload protection delay characteristics (overload delay, short-circuit acceleration), breaking through the limitation of the traditional hydraulic electromagnetic trip device that the protection characteristics are fixed.

[0049] 2. Breaking through the space limit and solving the physical bottleneck of rated current adjustment: under the premise that the volume of the circuit breaker is limited and the number of turns of the first coil cannot be increased, the second controllable electromagnetic force is applied by the intelligent control module to change the equivalent number of turns of the first coil, thereby realizing the adjustment of the rated current to meet the needs of different equipment for specific rated current specifications.

[0050] 3. Precise regulation of tripping response: The physical damping force of silicone oil and the adjustable electromagnetic force of the intelligent control module form a complex effect, which not only retains the inherent advantages of oil damping, but also dynamically adjusts the delay effect through electromagnetic force to realize precise time control, not only delaying the moving time of the oil cup iron core, but also realizing precise regulation of the tripping response time.

[0051] 4. Stable operation in a wide temperature range and free from temperature dependence: The thermal sensitive elements such as bimetallic strips are completely abandoned, and the silicone oil damping + electromagnetic driving mechanism is adopted, the viscosity of silicone oil changes little with temperature, ensuring the consistency of action within the range of-40℃ to +85℃, and the intelligent control module is a direct current electromagnetic system, which is less affected by the environment temperature.

[0052] 5. Double interlocking mechanical transmission mechanism to ensure reliable action and prevent misoperation: The tripping transmission mechanism adopts the design of "double interlocking + lever triggering + spring driving": the tripping bracket is embedded in the tripping groove of the tripping plate (first level locking) + the tripping plate is limited by the outer wall of the tripping plate (second level locking), and the two levels of locking must be simultaneously released to trip, effectively preventing misoperation caused by vibration and impact. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is the sectional view of the circuit breaker integrated with the adjustable hydraulic tripper of the present application;

[0054] Figure 2 is the local schematic view of the connection between the tripping bracket, the tripping release and the tripping plate of the present application;

[0055] Figure 3 is the local schematic view of the present application Figure 2 from another perspective;

[0056] Figure 4 is the sectional view of the adjustable hydraulic tripper of the first embodiment of the present application;

[0057] Figure 5 is the sectional view of the adjustable hydraulic tripper of the second embodiment of the present application.

[0058] In the figure, 100, circuit breaker body;

[0059] 200, adjustable hydraulic tripper; 210, tripper body; 211, magnetic yoke; 212, oil cup; 213, oil cup iron core; 214, oil cup spring; 215, pole shoe; 216, first coil; 217, armature; 218, armature spring; 220, intelligent control module; 221, control iron core; 222, second coil; 223, direct current power module; 224, plastic fixing sleeve; 2241, first mounting space; 2242, second mounting space;

[0060] 300, rotating frame; 301, operating handle; 310, tripping bracket; 320, tripping piece; 321, first tripping part; 322, second tripping part; 330, rotating shaft; 340, tripping plate; 341, tripping groove; 350, moving contact bracket; 351, moving contact; 360, stationary contact; 370, connecting rod; 380, tripping spring;

[0061] 400, arc extinguishing chamber; 410, arc extinguishing grid. DETAILED DESCRIPTION

[0062] The following is a specific embodiment of the present application and further describes the technical method of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0063] Embodiment one

[0064] As shown in the drawings, the present application provides a circuit breaker integrated with an adjustable hydraulic tripper, comprising: Figures 1-4 A circuit breaker body 100, which is internally provided with an adjustable hydraulic tripper 200, a tripping drive mechanism, and a main contact system;

[0065] The adjustable hydraulic tripper 200 comprises a tripper body 210 and an intelligent control module 220, wherein,

[0066] The tripper body 210 has a magnetic yoke 211, an oil cup 212, an axially movable oil cup core 213 and an oil cup spring 214 arranged at the end of the oil cup core 213, a pole shoe 215 arranged at the end of the oil cup 212, a first coil 216 wound on the outer wall of the oil cup 212, an armature 217, and an armature spring 218, the armature 217 is connected with the tripping drive mechanism in linkage;

[0067] The first coil 216 generates a first electromagnetic force after being energized, which drives the oil cup core 213 to move towards the pole shoe 215, when the oil cup core 213 moves close to the pole shoe 215, the first electromagnetic force attracts the armature 217 to rotate, and triggers the tripping drive mechanism to rotate to break the main contact system;

[0068] The intelligent control module 220 is arranged at the end of the oil cup 212, and is used for generating a second electromagnetic force acting on the oil cup core 213 in the same direction or opposite direction of the first electromagnetic force, and adjusting the direction and size of the second electromagnetic force to realize:

[0069]

[0070] ​The rated current adjusting function (active adjustment) is configured to: the user actively adjusts the direction and size of the second electromagnetic force to equivalently change the number of synthesized ampere-turns of the first coil 216, thereby meeting the needs of different rated current specifications, for example, the rated current of the first coil 216 is 40 A, but the equipment matched therewith needs a rated current of 60 A, at this time, the second electromagnetic force is arranged in the same direction as the first electromagnetic force and acts on the oil cup iron core 213 to make up for a difference of 20 A in the rated current, and vice versa, thereby flexibly adapting to various application scenarios.

[0071] The overload protection adjusting function (automatic adjustment) is configured to: the PCB board of the intelligent control module 220 monitors the size of the loop circuit in real time, and based on comparative analysis of the first electromagnetic force of the first coil 216, automatically adjusts the direction and size of the second electromagnetic force to dynamically control the time for the oil cup iron core 213 to move to the pole shoe 215, thereby realizing the adjustment of the overload protection characteristic, that is, the controllable adjustment of the tripping action time.

[0072] Among them, in the case of continuous overload, the intelligent control module 220 adjusts the direction of the second electromagnetic force to be opposite to the first electromagnetic force, delays the tripping time, and avoids false tripping caused by short-time overload or starting current;

[0073] And in the case of short circuit, the intelligent control module 220 adjusts the direction of the second electromagnetic force to be the same as the first electromagnetic force, further improves the tripping speed, and ensures the reliability of instantaneous protection.

[0074] Overall, the tripping action of the circuit breaker of the present application is based on the principle of combining electromagnetic-hydraulic composite driving and intelligent electromagnetic regulation, and the working process can be divided into three stages:

[0075] 1. Electromagnetic driving stage

[0076] When overcurrent (such as short circuit or severe overload) occurs in the main circuit, the current flowing through the first coil 216 rapidly increases, generating a strong magnetic field, which forms the first electromagnetic force that pushes the oil cup iron core 213 to move towards the pole shoe 215.

[0077] 2. Hydraulic damping and time control stage

[0078] The oil cup 212 is filled with silicone oil, and the oil cup iron core 213 squeezes the silicone oil during movement, and the silicone oil flows through the small gap between the inner wall of the oil cup 212 and the iron core, forming a physical damping force. This damping force slows down the movement speed of the iron core, realizing a time delay characteristic similar to "hydraulic", ensuring no false action under instantaneous impact current, and having good inverse time limit protection characteristics.

[0079] At the same time, the intelligent control module 220 applies an adjustable additional force to the oil cup iron core 213 through the second electromagnetic force:

[0080] When the tripping response needs to be accelerated (such as large short-circuit current), the second electromagnetic force is superimposed in the same direction as the first electromagnetic force to accelerate the movement of the iron core;

[0081] When the action time needs to be prolonged (such as light overload), the second electromagnetic force counteracts part of the first electromagnetic force to slow down the advancing speed of the iron core.

[0082] Thus, dynamic and accurate overload protection time adjustment is achieved.

[0083] 3. Mechanical triggering and contact breaking stage

[0084] When the oil cup iron core 213 approaches the pole shoe 215, the magnetic circuit tends to be closed, the magnetic flux density rises sharply, and a strong attraction force is generated to attract and rotate the armature 217. The armature 217 drives the tripping transmission mechanism to separate the movable contact 351 from the static contact 360, complete the circuit breaking, and the arc extinguishing grid 410 in the arc extinguishing chamber 400 quickly lengthens and cools the arc to achieve safe arc extinguishing.

[0085] It is worth mentioning that, compared with the current traditional hydraulic electromagnetic trippers, thermal-magnetic trippers and electronic trippers, the adjustable hydraulic electromagnetic tripper provided in the embodiment correspondingly solves the defects of the above three types of trippers:

[0086] 1. Non-adjustable protection characteristic problem of traditional hydraulic electromagnetic tripper:

[0087] Although the traditional hydraulic electromagnetic tripper can work in a wide temperature range, its overcurrent protection characteristic is usually fixed and cannot be adjusted according to specific application requirements.

[0088] The adjustable hydraulic electromagnetic tripper provided in the embodiment introduces an intelligent control module 220, which generates a same-direction or opposite-direction electromagnetic force by outputting a set direct current, thereby accelerating or delaying the moving time of the oil cup iron core 213, so as to realize accurate regulation and control of the tripping response time. Users can flexibly adjust the protection characteristics of the tripper according to actual needs, enhance the adaptability and flexibility of the equipment, meet the needs of different application scenarios, and the overload protection adjustable function is not affected by temperature.

[0089] 2. Temperature sensitivity problem of thermal-magnetic tripper:

[0090] The working characteristics of the traditional thermal-magnetic tripper are highly dependent on the ambient temperature, and it is unstable under extreme temperature conditions (such as below -40℃ or above +85℃).

[0091] The adjustable hydraulic electromagnetic release provided by the embodiment adopts silicon oil as damping medium, and the silicon oil has a low viscosity temperature variation coefficient, so that the release can work stably in a wide temperature range of-40 DEG C to +85 DEG C, and the introduced intelligent control module 220 is also not affected by temperature.

[0092] 3. Cost and volume problem of electronic release

[0093] The electronic release can realize more rated current specifications and certain adjustment range, but the high cost and large volume limit its wide application.

[0094] Overall, the adjustable hydraulic electromagnetic release provided by the embodiment realizes the selection of multiple rated current specifications by detecting the loop current and comparing the electromagnetic force of the first coil 216, and realizes the accurate regulation of the release response time through the intelligent control module 220, without complex electronic elements, reduces the manufacturing cost and the equipment volume, and at the same time maintains the high-precision current setting capability and flexible protection characteristic adjustment capability.

[0095] The innovative design scheme provides a more reliable, efficient and economical circuit protection solution for the power system, greatly improves the safety and stability of the electrical equipment, and provides a high-reliability, high-adaptability and low-cost intelligent protection solution for the medium and low voltage circuit breaker.

[0096] In addition, regarding the rated current adjustment function, it needs to be supplemented that in the actual design and manufacture of the circuit breaker, the installation space height is limited, and the release module must realize all functions in a limited volume, therefore, as the first coil 216 generating the main driving electromagnetic force, its winding space, wire diameter and total number of turns are strictly limited by physics;

[0097] For the above problems, by integrating the intelligent control module 220 in the release and introducing the controllable second electromagnetic force, the bottleneck that the number of turns of the first coil 216 cannot be broken through due to space limitation is skillfully bypassed, and the function of flexibly adjusting the rated current is realized without changing the number of turns of the first coil 216 and without expanding the volume of the release.

[0098] Without increasing the volume and without changing the structure of the first coil 216, the flexible adjustment of the rated current is realized through the electromagnetic force superposition regulation technology, which is one of the key innovative points of the application in the compact and intelligent circuit breaker design, and has outstanding practical value and industrialization advantage.

[0099] In summary, by introducing the adjustable second electromagnetic force in the traditional hydraulic electromagnetic release structure, the application at least realizes the following breakthrough improvements:

[0100] 1. Realize flexible adjustment of protection characteristics without sacrificing environmental adaptability and reliability:

[0101] Retain the advantages of temperature insensitivity and strong anti-electromagnetic interference capability of hydraulic structure, while realizing intelligent protection through electromagnetic regulation, taking into account the high reliability of mechanical tripping device and the functional flexibility of electronic tripping device;

[0102] 2. Break through the space limit and realize multi-grade adjustable rated current, improve product versatility and adaptability:

[0103] Under the premise that the internal space of the circuit breaker is limited and the number of turns of the first coil 216 cannot be increased, the adjustable second electromagnetic force is applied through the intelligent control module 220 to equivalently adjust the synthesized magnetic motive force, without replacing the coil or the tripping device body 210 to adapt to different rated current requirements. The same model of circuit breaker can cover multiple current levels, greatly reducing the number of product models, and reducing production, inventory and operation and maintenance costs.

[0104] 3. Avoid the temperature dependence of thermal elements and solve the problem of performance drift of traditional tripping devices at extreme temperatures:

[0105] Completely abandon the thermal sensitive elements such as bimetallic strips, and the tripping action is based on electromagnetic-hydraulic mechanism, ensuring that the protection characteristics remain highly consistent at -40°C low temperature startup or +85°C high temperature operation, suitable for harsh environment applications.

[0106] 4. Achieve the functional flexibility close to electronic tripping devices at a lower cost, with high cost performance and high performance:

[0107] Without complex microprocessors, A / D sampling circuits and high-power power supply modules, multi-grade protection settings can be achieved by regulating the current of the second coil 222 through direct current, significantly reducing the complexity and manufacturing cost of the electronic system, suitable for large-scale popularization and application.

[0108] 5. The structure is reasonably designed, easy to integrate and modify on the existing circuit breaker platform, and has good engineering application prospect:

[0109] The adjustable hydraulic tripping device 200 can be embedded in the existing circuit breaker architecture as a modular component, without the need to redesign the overall arc extinguishing system or operating mechanism, facilitating product upgrading and shortening the research and development cycle.

[0110] The following is a detailed description of the adjustable hydraulic tripping device 200:

[0111] Preferably, the intelligent control module 220 is configured to:

[0112] Control the iron core 221, which is close to the end face of the oil cup iron core 213;

[0113] a second coil 222 disposed around the outside of the control core 221;

[0114] a DC power module 223 electrically connected to the second coil 222, which outputs a set current to make the second coil 222 generate a specific DC magnetic flux and magnetize the control core 221, so that the control core 221 generates an attractive or repulsive force (i.e., a second electromagnetic force) to the oil cup core 213, thereby adjusting the speed of the oil cup core 213 moving towards the pole shoe 215.

[0115] The action principle is specifically described as follows:

[0116] When an overcurrent occurs in the main circuit of the circuit breaker, the first coil 216 (main excitation coil) is energized to generate a first electromagnetic force to drive the oil cup core 213 to accelerate moving towards the pole shoe 215. At the same time, according to the preset protection characteristic, the DC power module 223 outputs a controllable DC current to the second coil 222, which establishes a stable DC magnetic flux in the control core 221.

[0117] Since the control core 221 is opposite to the end surface of the oil cup core 213, the control core 221 generates an attractive or repulsive force (i.e., a second electromagnetic force) to the oil cup core 213, which acts on the initial stage and acceleration process of the movement of the oil cup core 213.

[0118] Since the size of the second electromagnetic force is controllable (by adjusting the size of the DC current), the time required for the oil cup core 213 to reach the pole shoe 215 can be accurately controlled, thereby realizing the adjustable tripping time.

[0119] Further, the control core 221 is coaxially arranged with the oil cup core 213, the second electromagnetic force generated by the control core 221 acts on the axial end surface of the oil cup core 213, and forms an end face type magnetic force coupling structure, so that the magnetic flux path is the shortest and the loss is the smallest, which significantly improves the magnetic field efficiency and system response speed, and ensures the rapid response to the overcurrent condition. In addition, by accurately adjusting the size of the current output by the DC power module 223, the strength of the second electromagnetic force can be flexibly adjusted to realize fine regulation of the tripping time, and meet the needs of protection characteristics in different application scenarios.

[0120] In addition, this compact design not only reduces the overall size of the device, facilitates integration into small or compact circuit breakers, but also improves space utilization, in line with the development trend of modern electrical equipment miniaturization. At the same time, since there are no complex mechanical components involved in the regulation process, only stable electromagnetic effects are used for control, which greatly reduces the failure rate and improves the long-term operation stability and reliability of the system.

[0121] Further, the following is the overall layout of the intelligent control module 220 in this embodiment:

[0122] The intelligent control module 220 also includes a plastic fixing sleeve 224, which is sleeved on the end of the oil cup 212 and is used to install the control core 221 and the second coil 222, ensuring the structural stability and electromagnetic performance of the entire intelligent control module 220.

[0123] Specifically, the plastic fixing sleeve 224 is divided into a first installation space 2241 and a second installation space 2242, wherein,

[0124] The first installation space 2241 is coaxially arranged with the oil cup core 213 and is used to install the control core 221, ensuring the precise alignment between the control core 221 and the oil cup core 213, and the shape of the first installation space 2241 matches the control core 221, which can firmly fix the control core 221 and prevent it from shifting or deflecting during operation, thereby ensuring the stability of the magnetic field and the effective transmission of the electromagnetic force;

[0125] The second installation space 2242 surrounds the outside of the first installation space 2241 and is used to install the second coil 222, and this surrounding design allows the second coil 222 to closely surround the control core 221, optimizing the magnetic flux path and improving the magnetic field efficiency. In addition, by placing the second coil 222 in the independent second installation space 2242, not only can good electrical isolation be achieved to avoid external interference, but also additional physical protection can be provided for the coil, prolonging its service life.

[0126] Overall, this layout not only optimizes the magnetic field path, reduces air gap and magnetic resistance, but also ensures efficient transmission of the second electromagnetic force, improving the accuracy and response speed of the trip time adjustment. At the same time, the modular layout simplifies the assembly process, reduces production costs, and provides good sealing, improving the protection level and long-term reliability of the equipment.

[0127] In addition, it is worth mentioning that the adjustable hydraulic electromagnetic release provided in this embodiment also has a composite damping force, which further enhances its control accuracy and flexibility, as explained below:

[0128] First, the oil cup 212 is filled with silicone oil, and when the oil cup core 213 is driven to move axially by the first electromagnetic force under overcurrent conditions, the flow of silicone oil will generate a physical damping force on the oil cup core 213. This physical damping force slows down the movement of the oil cup core 213 through liquid viscous resistance, acting as a delay, and the viscosity of the silicone oil is less affected by temperature changes, ensuring consistent performance of the release over a wide temperature range.

[0129] Secondly, the second electromagnetic force generated by the intelligent control module 220 produces an adjustable electromagnetic force on the movement of the oil cup core 213. The adjustable electromagnetic force is achieved by outputting a set current from the DC power module 223 to magnetize the control core 221 and then exert an attractive force or a pushing force on the oil cup core 213 to adjust the movement time of the oil cup core 213 towards the pole shoe 215.

[0130] The two damping forces, the physical damping force and the adjustable electromagnetic force, superimpose to form a complex force. While retaining the inherent advantages of the physical damping force, the delay effect is dynamically adjusted by the electromagnetic force to achieve precise regulation of the tripping response time and improve the overall stability and reliability of the system. By adjusting the output current of the intelligent control module 220, the strength of the adjustable electromagnetic force can be flexibly adjusted, so that the tripping time can be fine-tuned according to actual needs to meet the protection requirements in different application scenarios.

[0131] In summary, this composite damping mechanism combines the physical damping of silicone oil and the adjustable electromagnetic force generated by the intelligent control module 220, significantly enhancing the regulation ability and adaptability of the tripper, providing an efficient and reliable overcurrent protection solution that not only optimizes the time control of the tripping action but also improves the stability and durability of the device in complex environments.

[0132] The following is a specific description of the tripping structure and principle of the circuit breaker body 100:

[0133] Preferably, the tripping transmission mechanism comprises:

[0134] A rotating frame 300 connected to an external operating handle 301;

[0135] A tripping bracket 310 arranged in the rotating frame 300 and connected thereto;

[0136] A tripping release 320 and a rotating shaft 330, the rotating shaft 330 being arranged in the rotating frame 300, the tripping release 320 being rotatably arranged on the rotating shaft 330 and being connected to the armature 217 in linkage;

[0137] A tripping plate 340 hingedly connected to the rotating frame 300 at one end and forming a locking fit between the tripping bracket 310 and the tripping release 320 at the other end.

[0138] The tripping release 320 has a first tripping release part 321 and a second tripping release part 322, the first tripping release part 321 being in linkage with the armature 217, and the second tripping release part 322 being in linkage with the tripping plate 340.

[0139] Specifically, the tripping plate 340 is provided with a tripping groove 341 and has a locking position and a tripping position, wherein,

[0140] When the trip plate 340 is in the locking position, the second unlocking part 322 is in abutment with the outer wall of the trip plate 340 to limit the rotation of the trip plate 340, and the trip bracket 310 extends into the trip slot 341 and is in abutment with the trip plate 340, at this time, the trip plate 340 limits the rotation of the trip bracket 310;

[0141] When the trip plate 340 is converted to the tripping position, the armature 217 is attracted and pushes the first unlocking part 321 to make the unlocking part 320 rotate, the second unlocking part 322 rotates to the position where the trip slot 341 is located to release the limiting of the trip plate 340, the trip plate 340 rotates to the second unlocking part 322 and makes the trip bracket 310 disengage from the trip slot 341.

[0142] In addition, the rotating frame 300 is also connected with:

[0143] The moving contact bracket 350 is used for mounting the moving contact 351, and the moving contact 351 and the fixedly mounted stationary contact 360 form a main contact system;

[0144] The connecting rod 370 is connected with the moving contact bracket 350 and the rotating frame 300 at two ends respectively;

[0145] The trip spring 380 is connected with the top of the rotating frame 300 at one end and connected with the connecting rod 370 at the other end for connecting with the rotating frame 300;

[0146] When the trip plate 340 is converted to the tripping position, the trip spring 380 pulls the connecting rod 370 and the moving contact bracket 350 upward to make the moving contact 351 separate from the stationary contact 360.

[0147] Detailed explanation of the tripping process principle (full-stage action flow)

[0148] The tripping drive mechanism of the present application realizes the complete automatic protection flow from fault signal sensing to main contact breaking through precise mechanical linkage design, and the whole tripping process can be divided into four stages:

[0149] Stage 1: Fault sensing and signal triggering

[0150] When overcurrent (such as short circuit or overload) occurs in the main circuit, the first coil 216 in the adjustable hydraulic trip unit 200 flows through abnormal current, generates a first electromagnetic force, and the oil cup core 213 moves to the direction of the pole shoe 215 against the silicon hydraulic pressure under the drive of the first electromagnetic force, when the core approaches the pole shoe 215, the magnetic flux density increases sharply, the armature 217 is quickly attracted and rotated.

[0151] Stage 2: Linkage unlocking (unlocking part 320 action)

[0152] After the armature 217 is attracted, it pushes its linkage component, the first tripping part 321 of the tripping piece 320, which rotates around its rotation axis 330, and the second tripping part 322 at the other end rotates accordingly, and the position originally resisting the outer wall of the release plate 340 is released, and the release plate 340 loses the limiting constraint from the second tripping part 322, and enters a free rotation state.

[0153] Stage 3: Lock release (release plate 340 and release support 310 decoupling)

[0154] After losing the limit, the release plate 340 starts to rotate around its hinge point in the release direction, and the release slot 341 on the release plate 340 rotates and shifts accordingly, and the release support 310 originally embedded in the release slot 341 is released and comes out of the release slot 341, and thus the rotation freedom of the rotating frame 300 is completely released.

[0155] Stage 4: Main contact quick breaking

[0156] Once the release support 310 comes out, the energy storage release spring 380 releases energy, pulls the connecting rod 370 upward, and the connecting rod 370 drives the moving contact support 350 to rise quickly, the moving contact 351 is separated from the static contact 360, and the circuit is physically disconnected, at the same time, the arc enters the arc chamber 400, is divided and cooled by the arc runner 410, and arc extinguishing is completed.

[0157] The release drive mechanism adopts a composite mechanism of "double interlocking + lever triggering + spring driving", which has the following obvious advantages:

[0158] 1. High reliability of locking, preventing false tripping

[0159] Double mechanical locking mechanism is adopted:

[0160] First level: the release support 310 is clamped into the release slot 341 of the release plate 340, limiting the movement of the rotating frame 300;

[0161] Second level: the second tripping part 322 of the tripping piece 320 abuts against the outer wall of the release plate 340, preventing the release plate 340 from rotating by itself;

[0162] The two levels of locking form a "logical and" relationship, and both conditions must be met to unlock, which greatly improves the stability in the closed state and effectively resists external disturbances such as vibration, impact, electromagnetic interference, etc.

[0163] 2. Sensitive and reliable tripping response

[0164] Through the tripping piece 320 as an intermediate transmission part, the small stroke attraction action of the armature 217 is converted into a clear release instruction to the release plate 340, and the lever structure has a force amplification effect, even if the driving force of the armature 217 is small, it can also reliably trigger the subsequent action;

[0165] 3. Action sequence is clear, avoiding jamming

[0166] The entire tripping process follows strict timing logic: first, the tripping plate 340 is released, then the tripping bracket 310 is released, and finally the main contact system is driven to break by the tripping spring 380. The movement path of each component is clear, without cross interference, avoiding the phenomenon of jamming caused by assembly errors or wear.

[0167] 4. Support fast breaking and high breaking capacity

[0168] The tripping spring 380 pre-stores energy, which immediately drives the contact 351 to separate after the lock release. The breaking speed is not affected by the operation speed, and the spring force can be optimized according to the breaking capacity requirement to meet the requirement of fast repulsion under high short-circuit current, which significantly improves the current limiting performance and electrical life of the circuit breaker in cooperation with the arc extinguishing system.

[0169] 5. Compact structure, conducive to miniaturization and integration

[0170] All components are centrally located around the rotating frame 300, with high space utilization, which can be modularly integrated with the adjustable hydraulic trip unit 200, facilitating replacement and upgrade in existing circuit breaker platforms.

[0171] Embodiment Two

[0172] As shown in the following figure, embodiment two is different from embodiment one in that embodiment two provides another structure of the adjustable hydraulic trip unit 200, and the intelligent control module 220 adopts a different configuration, which is specifically described as follows: Figure 5 Preferably, the intelligent control module 220 is configured as:

[0173] The second coil 222 is arranged outside the oil cup iron core 213;

[0174] The DC power module 223 is electrically connected with the second coil 222, and outputs a set current through the DC power module 223 to make the second coil 222 generate a specific DC magnetic flux, and the DC magnetic flux forms a second electromagnetic force applied to the oil cup iron core 213.

[0175] Different from embodiment one, the circumferential magnetic coupling structure is adopted in embodiment two, that is, the second coil 222 is directly sleeved outside the oil cup iron core 213, and an axial distributed DC magnetic field is established around the oil cup iron core 213 after electrification, and a second electromagnetic force is generated on the oil cup iron core 213 by using the principle of electromagnetic induction, which has the same effect as the first electromagnetic force generated by the first coil 216 in the scheme of embodiment one.

[0176]

[0177] ​Specifically, the plastic fixing sleeve 224 is sleeved on the end of the oil cup 212 and is used for mounting the second coil 222. In particular, one end of the oil cup core 213 extends into the plastic fixing sleeve 224, so that the direct-current magnetic flux generated by the second coil 222 is applied to the radial circumferential surface of the oil cup core 213.

[0178] The structure design eliminates the independent control core 221 and the complex separation space in the plastic fixing sleeve 224, is more simple and compact, is more convenient to assemble, reduces the number of parts, is beneficial to reduce the manufacturing cost and improve the reliability, and through adjustment of the output current of the direct-current power supply module 223, the precise control of the second electromagnetic force can still be realized, and then the adjustability of the tripping time is realized.

[0179] In addition, it is worth mentioning that the two schemes provided in embodiment one and embodiment two have different positions and strengths acting on the oil cup core 213 and can be applied to different characteristic curve requirements.

[0180] In embodiment one, the intelligent control module 220 generates the second electromagnetic force through the control core 221, which acts on the axial end surface of the oil cup core 213, to form an end surface type magnetic force coupling structure. This design can provide a stronger second electromagnetic force, is suitable for delaying the movement of the oil cup core 213, and is particularly suitable for application scenarios that require longer tripping time or larger load;

[0181] In embodiment two, the second coil 222 is directly wound on the external circumferential surface of the oil cup core 213, and the second electromagnetic force is formed through the radial direct-current magnetic flux. The electromagnetic force generated in this way is relatively uniform and has a wider range of action, is suitable for scenes that require fine adjustment of the tripping response time, and because the structure is more compact and the number of parts is reduced, it is more suitable for application environments with limited space or cost sensitivity.

[0182] The two schemes can meet the diversified protection characteristic requirements through different mechanical layouts and electromagnetic force application modes. Users can select appropriate schemes according to specific application scenarios to achieve the best overcurrent protection effect.

[0183] Whether it is a strong electromagnetic damping force or a fine time control, the two designs can provide flexible and efficient solutions to enhance the ability of the circuit breaker to adapt to different working conditions.

[0184] The technical means disclosed in the present application scheme is not limited to the technical means disclosed in the above technical means, and also includes technical solutions composed of any combination of the above technical features. The above is a specific embodiment of the present application. It should be pointed out that for ordinary skilled persons in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, which are also considered as the protection scope of the present application.

[0185] It should be noted that all directional indications, such as upper, lower, left, right, front, back, under, above, upward, downward, etc., are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0186] In addition, the descriptions such as "first", "second", "one", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixation", etc. should be interpreted broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0187] The technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0188] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A circuit breaker integrating an adjustable hydraulic trip unit, characterized in that, include: The circuit breaker body has an adjustable hydraulic trip unit, a trip transmission mechanism, and a main contact system built in. The adjustable hydraulic trip unit includes a trip unit body and an intelligent control module, wherein... The trip unit body has an oil cup, an axially movable oil cup core, a pole shoe disposed at the end of the oil cup, a first coil wound around the outer wall of the oil cup, and an armature, the armature being linked to the trip transmission mechanism; When the first coil is energized, it generates a first electromagnetic force that drives the oil cup core toward the pole shoe. When the oil cup core moves close to the pole shoe, the first electromagnetic force attracts the armature to rotate and triggers the tripping transmission mechanism to rotate to disconnect the main contact system. The intelligent control module is located at the end of the oil cup and is used to generate a second electromagnetic force that acts in the same or opposite direction as the first electromagnetic force on the iron core of the oil cup. This is achieved by adjusting the direction and magnitude of the second electromagnetic force. Rated current adjustment: Active adjustment to equivalently change the combined ampere-turns of the first coil; Overload protection adjustment: Based on the real-time current of the first coil, the direction and magnitude of the second electromagnetic force are automatically adjusted to dynamically control the time it takes for the oil cup core to move to the pole shoe; The intelligent control module is configured as follows: Control the iron core, which is close to the end face of the oil cup iron core; The second coil is wound around the outside of the control core; A DC power supply module is electrically connected to the second coil. The DC power supply module outputs a set current to make the second coil generate a specific DC magnetic flux and magnetize the control iron core. The control iron core generates the second electromagnetic force on the oil cup iron core. Or the intelligent control module may be configured as follows: The second coil is wound around the outside of the oil cup core; A DC power supply module is electrically connected to the second coil. The DC power supply module outputs a set current to make the second coil generate a specific DC magnetic flux. The DC magnetic flux forms the second electromagnetic force applied to the iron core of the oil cup.

2. A circuit breaker integrating an adjustable hydraulic trip unit according to claim 1, characterized in that, The oil cup is filled with silicone oil. During the axial movement of the iron core of the oil cup, the flow of the silicone oil generates a physical damping force on the movement of the iron core of the oil cup. The second electromagnetic force generated by the intelligent control module produces an adjustable electromagnetic force on the movement of the oil cup core.

3. A circuit breaker integrating an adjustable hydraulic trip unit according to claim 2, characterized in that, The physical damping force and the adjustable electromagnetic force are superimposed to form a composite force, which accelerates or delays the movement of the oil cup core toward the pole shoe.

4. A circuit breaker integrating an adjustable hydraulic trip unit according to claim 1, characterized in that, The tripping transmission mechanism includes: Rotate the frame, which connects to an external operating handle; A tripping bracket is disposed within the rotating frame and the two are connected; The fastener and the rotating shaft are connected together, with the rotating shaft passing through the rotating frame and the fastener sleeved on the rotating shaft and linked to the armature. The trip plate has one end hinged to the rotating frame and the other end locked to the trip bracket and the rotating shaft.

5. A circuit breaker integrating an adjustable hydraulic trip unit according to claim 4, characterized in that, The release component has a first release part and a second release part. The first release part is linked to the armature, and the second release part is linked to the release plate.

6. A circuit breaker integrating an adjustable hydraulic trip unit according to claim 5, characterized in that, The tripping plate is provided with a tripping groove and has a locking position and a tripping position, wherein, When the trip plate is in the locked position, the second release part abuts against the outer wall of the trip plate to restrict the rotation of the trip plate, and the trip bracket extends into the trip groove and abuts against the trip plate. At this time, the trip plate restricts the rotation of the trip bracket. When the trip plate is switched to the trip position, the armature attracts and pushes the first release part to make the release member rotate. The second release part rotates to the position of the trip groove to release the restriction on the trip plate. The trip plate rotates onto the second release part and causes the trip bracket to disengage from the trip groove.

7. A circuit breaker integrating an adjustable hydraulic trip unit according to claim 6, characterized in that, The rotating frame is also connected to: A moving contact bracket is used to mount a moving contact, which, together with a fixed stationary contact, forms a main contact system. The connecting rod has its two ends connected to the moving contact bracket and the rotating frame, respectively. A release spring, one end of which is connected to the top of the rotating frame, and the other end of which is connected to the end of the connecting rod for connection with the rotating frame; When the trip plate is switched to the trip position, the trip spring pulls the connecting rod and the moving contact bracket upward to separate the moving contact from the stationary contact.

8. A circuit breaker integrating an adjustable hydraulic trip unit according to claim 1, characterized in that, The circuit breaker body is also provided with an arc-extinguishing chamber, which is composed of multiple layers of arc-extinguishing grids. The main contact system is located in the arc-extinguishing chamber, and the arc-extinguishing grids extinguish the high-voltage arc generated when the main contact system is disconnected.

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