Adjustable oil-damped electromagnetic release for circuit breaker

Abstract

The application discloses an adjustable oil-damping electromagnetic release applied to a circuit breaker and belongs to the technical field of releases. The oil-damping electromagnetic release comprises an oil-damping base unit, an intelligent control module and the like. The oil-damping base unit comprises an oil cup, an axially movable oil cup core, a pole shoe arranged at the end of the oil cup and a first coil arranged on the outer wall of the oil cup. When the first coil is electrified, the first electromagnetic force driving the oil cup core to move towards the pole shoe is generated. The intelligent control module is arranged at the end of the oil cup and is used for outputting controllable direct current to generate the second electromagnetic force in the same direction or in the opposite direction of the first electromagnetic force. The release is provided with the rated current regulation function and the overload protection regulation function by adjusting the size and the direction of the second electromagnetic force. By introducing the controllable second electromagnetic force into the traditional oil-damping electromagnetic release, the rated current specification can be regulated, the release action time can be adjusted, the advantage of the temperature stability of the oil-damping release is reserved, and the short board of the unadjustable protection characteristics is made up.

Description

Technical Field

[0001] This invention belongs to the field of trip unit technology, specifically relating to an adjustable oil-damped electromagnetic trip unit for use in circuit breakers. Background Technology

[0002] With the development of power systems and the increasing demands of users for the safety performance of electrical equipment, circuit breakers, as a key component of circuit protection, directly affect the stability and safety of the entire power system. Circuit breakers use trip units to achieve overcurrent protection; however, traditional trip units currently have certain limitations in practical applications.

[0003] 1. Thermal-electromagnetic trip unit

[0004] Temperature sensitivity: The operating characteristics of thermo-electromagnetic trip units are highly dependent on ambient temperature, especially under extreme temperature conditions (such as below -40℃ or above +85℃), their operating stability will be significantly affected, causing changes in protection characteristics and thus affecting the reliability of the circuit breaker.

[0005] Limited rated current specifications: Due to design limitations, circuit breakers using thermal-electromagnetic trip units can only offer a limited selection of rated current specifications, which cannot meet the needs of multiple selective current protections of the same circuit breaker in specific situations. This limits its applicability in different application fields.

[0006] 2. Electronic trip unit

[0007] Cost and size issues: Although electronic trip units can achieve more rated current specifications and can adjust the overcurrent tripping multiple within a certain range, their high cost and large size are the main obstacles to their widespread application.

[0008] In addition, electronic components are sensitive to environmental conditions (such as humidity and vibration), which may affect their reliability in long-term use.

[0009] 3. Traditional oil-damped electromagnetic trip unit

[0010] Non-adjustable protection characteristics: Although traditional oil-damped electromagnetic trip units can operate reliably over a wide temperature range (-40℃ to +85℃) and have good rated current setting accuracy, their overcurrent protection characteristics are usually fixed and cannot be adjusted according to specific application requirements. This limits their application effectiveness in scenarios where flexible adjustment of protection characteristics is required. Summary of the Invention

[0011] This invention addresses the aforementioned problems in the prior art by proposing an adjustable oil-damped electromagnetic trip unit with adjustable overload protection that is unaffected by temperature.

[0012] This invention can be achieved through the following technical solutions:

[0013] An adjustable oil-damped electromagnetic trip unit for use in circuit breakers, comprising:

[0014] The oil damping matrix unit includes an oil cup, an axially movable oil cup core, a pole shoe disposed at the end of the oil cup, and a first coil wound around the outer wall of the oil cup. When the first coil is energized, a first electromagnetic force is generated to drive the oil cup core toward the pole shoe.

[0015] An intelligent control module, located at the end of the oil cup, outputs a controllable DC current to generate a second electromagnetic force that is in the same or opposite direction to the first electromagnetic force. This second electromagnetic force acts on the iron core of the oil cup. By adjusting the magnitude and direction of the second electromagnetic force, the trip unit acquires rated current adjustment and overload protection adjustment functions.

[0016] The rated current adjustment function is configured to: actively adjust the direction and magnitude of the second electromagnetic force to effectively change the combined ampere-turns of the first coil;

[0017] The overload protection adjustment function is configured as follows: the intelligent control module automatically adjusts the direction and magnitude of the second electromagnetic force based on the real-time current of the first coil, so as to dynamically control the time when the oil cup core moves to the pole shoe.

[0018] As a further improvement of the present invention, the intelligent control module includes:

[0019] Control the iron core, which is close to the end face of the oil cup iron core;

[0020] The second coil is wound around the outside of the control core;

[0021] A DC power supply module is electrically connected to the second coil. The DC power supply module outputs a set current to cause the second coil to 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.

[0022] As a further improvement of the present invention, the control core and the oil cup core are coaxially arranged, and the second electromagnetic force generated by the control core acts on the axial end face of the oil cup core, forming an end face magnetic coupling structure.

[0023] As a further improvement of the present invention, the intelligent control module also includes a plastic fixing sleeve, which is fitted onto the end of the oil cup and used to install the control iron core and the second coil.

[0024] As a further improvement of the present invention, the plastic fixing sleeve is divided into a first mounting space and a second mounting space, wherein...

[0025] The first mounting space is coaxially arranged with the oil cup core and is used to install the control core, and the shape of the first mounting space matches the control core to fix the control core.

[0026] The second mounting space surrounds the outside of the first mounting space and is used to mount the second coil.

[0027] As a further improvement of the present invention, the intelligent control module is configured as follows:

[0028] The second coil is wound around the outside of the oil cup core;

[0029] 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.

[0030] As a further improvement of the present invention, the DC magnetic flux generated by the second coil is applied to the radial circumferential surface of the oil cup core, forming a circumferential magnetic coupling structure.

[0031] As a further improvement of the present invention, the intelligent control module further includes a plastic retaining sleeve, which is fitted onto the end of the oil cup and used to install the second coil, wherein...

[0032] One end of the oil cup core extends into the plastic retaining sleeve so that the DC magnetic flux generated by the second coil is applied to the radial circumferential surface of the oil cup core.

[0033] As a further improvement of the present invention, the oil cup is filled with silicone oil, and 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.

[0034] The second electromagnetic force generated by the intelligent control module produces an adjustable electromagnetic force on the movement of the oil cup core.

[0035] As a further improvement of the present invention, 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.

[0036] Compared with the prior art, the present invention has the following beneficial effects.

[0037] 1. Significantly improved stability across the entire temperature range and breakthrough in overcoming the limitation of non-adjustable protection characteristics.

[0038] Combining the low temperature sensitivity of silicone oil with the temperature drift-free characteristics of electromagnetic damping, it ensures consistent tripping action under extreme ambient temperatures, overcoming the temperature dependence defect of thermo-electromagnetic trip units.

[0039] Simultaneously, the intelligent control module outputs a controllable DC current to generate electromagnetic forces in the same or opposite directions, achieving continuous adjustment of the action time of the oil damping trip unit for the first time. Users can flexibly set the protection characteristics according to their needs, solving the industry pain point of fixed protection parameters in traditional oil damping solutions.

[0040] 2. Rated current specification is adjustable

[0041] Users can actively adjust the direction and magnitude of the second electromagnetic force to effectively change the combined ampere-turns of the first coil, thereby meeting the requirements of different rated current specifications and adapting to different application scenarios.

[0042] 3. Precise control of tripping response

[0043] The physical damping force of silicone oil and the adjustable electromagnetic force of the intelligent control module form a combined effect. While retaining the inherent advantages of oil damping, the electromagnetic force dynamically adjusts the hysteresis effect to achieve precise time control. This not only slows down the movement time of the oil cup core, but also enables precise control of the tripping response time.

[0044] 4. Dual solutions adapt to diverse scenarios

[0045] Example 1 is suitable for situations where a large damping force is required to delay the movement of the oil cup core, and is particularly suitable for application scenarios with long tripping time requirements or large loads.

[0046] The second embodiment, due to its compact design, is more suitable for applications with limited space or cost sensitivity, and can meet diverse protection feature requirements.

[0047] 5. High-efficiency magnetic circuit optimized response speed

[0048] Example 1 adopts an end-face magnetic coupling structure to ensure the shortest magnetic flux path and the least loss, thereby improving magnetic field efficiency and system response speed;

[0049] Example 2 uses a circumferential magnetic coupling structure to make the second coil tightly surround the oil cup core, which optimizes the magnetic flux path and improves the uniformity and stability of the magnetic field.

[0050] 6. Compact structure and cost optimization

[0051] The intelligent control module is integrated into a plastic mounting sleeve, which is simple and compact in structure, reducing the overall size of the trip unit and making it easy to integrate into miniaturized or compact circuit breakers. This aligns with the trend of miniaturization in modern electrical equipment and eliminates the need for complex electronic components, further reducing production and maintenance costs. Attached Figure Description

[0052] Figure 1 This is a cross-sectional view of the adjustable oil-damped electromagnetic trip device according to Embodiment 1 of the present invention;

[0053] Figure 2 This is a cross-sectional view of the adjustable oil-damped electromagnetic trip device according to Embodiment 2 of the present invention.

[0054] In the diagram, 100 is the oil cup; 110 is the oil cup core; 120 is the pole shoe; 130 is the oil cup spring; 140 is the first coil; 150 is the magnetic yoke; 160 is the armature; and 170 is the armature spring.

[0055] 200 Intelligent control module; 210 Control iron core; 220 Second coil; 230 DC power supply module; 240 Plastic fixing sleeve; 241 First mounting space; 242 Second mounting space. Detailed Implementation

[0056] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical methods of the present invention. However, the present invention is not limited to these embodiments.

[0057] Example 1

[0058] like Figure 1 As shown, the present invention provides an adjustable oil-damped electromagnetic trip unit for use in circuit breakers, comprising:

[0059] The oil damping base unit includes an oil cup 100, an axially movable oil cup core 110, a pole shoe 120 disposed at the end of the oil cup 100, an oil cup spring 130 disposed inside the oil cup 100, and a first coil 140 wound around the outer wall of the oil cup 100. When the first coil 140 is energized, a first electromagnetic force is generated to drive the oil cup core 110 toward the pole shoe 120 (this oil damping base unit, together with the magnetic yoke 150, armature 160, and armature spring 170, forms a complete oil damping electromagnetic trip device).

[0060] The intelligent control module 200 is located at the end of the oil cup 100 and is used to output a controllable DC current to generate a second electromagnetic force that is in the same or opposite direction to the first electromagnetic force. The second electromagnetic force acts on the iron core 110 of the oil cup. By adjusting the magnitude and direction of the second electromagnetic force, the trip unit can have rated current adjustment function and overload protection adjustment function.

[0061] The rated current adjustment function (active adjustment) is configured as follows: the user actively adjusts the direction and magnitude of the second electromagnetic force to effectively change the combined ampere-turns of the first coil 140, thereby meeting the requirements of different rated current specifications. For example, the rated current of the first coil 140 is 40A, but its matching equipment requires a rated current of 60A. At this time, the second electromagnetic force is set in the same direction as the first electromagnetic force and acts on the oil cup core to make up for the 20A rated current difference. The same applies to the opposite direction, thereby flexibly adapting to a variety of application scenarios.

[0062] The overload protection adjustment function (automatic adjustment) is configured as follows: the PCB board of the intelligent control module 200 monitors the size of the circuit in real time, and based on the comparative analysis of the first electromagnetic force of the first coil 140, automatically adjusts the direction and magnitude of the second electromagnetic force to dynamically control the time when the oil cup iron core 110 moves to the pole shoe 120, thereby realizing the adjustment of overload protection characteristics, that is, realizing the controllable adjustment of the tripping action time.

[0063] In the case of continuous overload, the intelligent control module 200 adjusts the direction of the second electromagnetic force to be opposite to that of the first electromagnetic force, delaying the tripping time and avoiding false tripping caused by short-term overload or starting current.

[0064] In the event of a short circuit, the intelligent control module 200 adjusts the direction of the second electromagnetic force to be the same as that of the first electromagnetic force, further improving the tripping speed and ensuring the reliability of instantaneous protection.

[0065] It is worth mentioning that by introducing a second electromagnetic force into the traditional oil-damped electromagnetic trip unit, the tripping action time can be adjusted, predicted, and repeatedly controlled. This not only retains the advantages of the oil-damped trip unit, such as simple structure, good temperature stability, and strong anti-interference ability, but also makes up for its shortcoming of non-adjustable overload protection characteristics.

[0066] Furthermore, compared to the currently used traditional hydraulic damping electromagnetic trip units, thermo-electromagnetic trip units, and electronic trip units, the adjustable hydraulic damping electromagnetic trip unit provided in this embodiment addresses the shortcomings of the aforementioned three types of trip units:

[0067] 1. The problem of non-adjustable protection characteristics of traditional oil-damped electromagnetic trip units:

[0068] Traditional oil-damped electromagnetic trip units can operate over a wide temperature range, but their overcurrent protection characteristics are usually fixed and cannot be adjusted according to specific application requirements.

[0069] The adjustable oil-damped electromagnetic trip unit provided in this embodiment introduces an intelligent control module 200, which generates electromagnetic forces in the same or opposite direction by outputting a set DC current, thereby accelerating or delaying the movement time of the oil cup core 110, thus achieving precise control of the trip response time. Users can flexibly adjust the protection characteristics of the trip unit according to actual needs, enhancing the adaptability and flexibility of the equipment, meeting the needs of different application scenarios, and the overload protection adjustable function is not affected by temperature.

[0070] 2. Temperature sensitivity issue of thermo-electromagnetic trip units:

[0071] The operating characteristics of traditional thermo-electromagnetic trip units are highly dependent on ambient temperature, and they are unstable under extreme temperature conditions (such as below -40°C or above +85°C).

[0072] The adjustable oil-damped electromagnetic trip unit provided in this embodiment uses silicone oil as the damping medium. Silicone oil has a low viscosity temperature change coefficient, which enables the trip unit to work stably in a wide temperature range of -40℃ to +85℃. Furthermore, the intelligent control module 200 introduced is also unaffected by temperature.

[0073] 3. Cost and size issues of electronic trip units:

[0074] Electronic trip units can achieve more rated current specifications and a certain adjustment range, but their high cost and large size limit their widespread application.

[0075] In summary, the adjustable oil-damped electromagnetic trip unit provided in this embodiment detects the circuit current and compares the electromagnetic force of the first coil 140 to provide the corresponding current direction and magnitude of the second coil 220, enabling the selection of multiple rated current specifications. Furthermore, the intelligent control module 200 achieves precise control of the trip response time, eliminating the need for complex electronic components, reducing manufacturing costs and equipment size, while maintaining high-precision current setting capability and flexible protection characteristic adjustment capability.

[0076] Overall, the adjustable oil-damped electromagnetic trip unit provided in this embodiment, by combining oil damping technology and intelligent control module 200, not only solves the problems of temperature sensitivity, cost and size, and non-adjustable protection characteristics in the prior art, but also significantly improves the performance and applicability of the circuit breaker.

[0077] This innovative design provides a more reliable, efficient, and economical circuit protection solution for power systems, greatly improving the safety and stability of electrical equipment and providing a highly reliable, adaptable, and low-cost intelligent protection solution for medium and low voltage circuit breakers.

[0078] Preferably, the intelligent control module 200 is configured as follows:

[0079] Control core 210, which is close to the end face of oil cup core 110;

[0080] The second coil 220 is wound around the outside of the control core 210;

[0081] The DC power module 230 is electrically connected to the second coil 220. The DC power module 230 outputs a set current to make the second coil 220 generate a specific DC magnetic flux and magnetize the control iron core 210. The control iron core 210 generates an attractive force or a pushing force (i.e., a second electromagnetic force) on the oil cup iron core 110, thereby adjusting the speed at which the oil cup iron core 110 moves toward the pole shoe 120.

[0082] Its operating principle is explained in detail below:

[0083] When an overcurrent occurs in the main circuit of the circuit breaker, the first coil 140 (main excitation coil) is energized to generate the first electromagnetic force, which drives the oil cup core 110 to accelerate towards the pole shoe 120. At the same time, according to the preset protection characteristics, the DC power supply module 230 outputs a controllable DC current to the second coil 220, which establishes a stable DC magnetic flux in the control core 210.

[0084] Since the control core 210 and the oil cup core 110 have opposite end faces, the control core 210 generates an axial positive thrust or reverse attraction (i.e., the second electromagnetic force) on the oil cup core 110. The second electromagnetic force acts on the initial stage and acceleration process of the oil cup core 110's movement.

[0085] Since the magnitude of the second electromagnetic force is controllable (by adjusting the magnitude of the DC current), the time required for the oil cup core 110 to reach the pole shoe 120 can be precisely controlled, thereby achieving adjustable tripping action time.

[0086] Furthermore, the control core 210 and the oil cup core 110 are coaxially arranged, and the second electromagnetic force generated by the control core 210 acts on the axial end face of the oil cup core 110, forming an end-face magnetic coupling structure. This minimizes the magnetic flux path and losses, significantly improving magnetic field efficiency and system response speed, and ensuring a rapid response to overcurrent conditions. In addition, by precisely adjusting the current output of the DC power module 230, the strength of the second electromagnetic force can be flexibly adjusted, enabling fine control of the tripping time and meeting the protection characteristics requirements of different application scenarios.

[0087] In addition, this compact design not only reduces the overall size of the equipment, making it easier to integrate into miniaturized or compact circuit breakers, but also improves space utilization, which is in line with the development trend of miniaturization of modern electrical equipment. At the same time, since there are no complex mechanical parts involved in the adjustment process, and control is carried out solely by stable electromagnetic effects, the failure rate is greatly reduced, and the long-term operational stability and reliability of the system are improved.

[0088] Furthermore, the following is a description of the overall layout of the intelligent control module 200 in this embodiment:

[0089] The intelligent control module 200 also includes a plastic fixing sleeve 240, which is fitted onto the end of the oil cup 100 and used to install the control iron core 210 and the second coil 220, ensuring the structural stability and electromagnetic performance of the entire intelligent control module 200.

[0090] Specifically, the plastic fixing sleeve 240 is divided into a first installation space 241 and a second installation space 242, wherein,

[0091] The first mounting space 241 is coaxially arranged with the oil cup core 110 and is used to install the control core 210, ensuring precise alignment between the control core 210 and the oil cup core 110. Furthermore, the shape of the first mounting space 241 matches the control core 210, which can firmly fix the control core 210 and prevent it from shifting or deflecting during operation, thereby ensuring the stability of the magnetic field and the effective transmission of electromagnetic force.

[0092] The second mounting space 242 surrounds the outside of the first mounting space 241 and is used to mount the second coil 220. This surround design allows the second coil 220 to tightly surround the control core 210, optimizing the magnetic flux path and improving magnetic field efficiency. In addition, by placing the second coil 220 in the independent second mounting space 242, not only can good electrical isolation be achieved to avoid external interference, but also additional physical protection can be provided for the coil, extending its service life.

[0093] Overall, this layout not only optimizes the magnetic field path and reduces air gaps and magnetic resistance, but also ensures efficient transmission of the second electromagnetic force, improves the accuracy and response speed of tripping time adjustment, and simplifies the assembly process, reduces production costs, provides good sealing, and improves the protection level and long-term operational reliability of the equipment.

[0094] It is also worth mentioning that the adjustable oil-damped electromagnetic trip unit provided in this embodiment also has a composite damping force. This feature further enhances its control accuracy and flexibility, as detailed below:

[0095] First, the oil cup 100 is filled with silicone oil. When the oil cup core 110 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 110. This physical damping force slows down the movement speed of the oil cup core 110 through the viscous resistance of the liquid, thus playing a delay role. In addition, the viscosity of silicone oil is less affected by temperature changes, ensuring the consistent performance of the trip unit over a wide temperature range.

[0096] Secondly, the second electromagnetic force generated by the intelligent control module 200 produces an adjustable electromagnetic force on the movement of the oil cup iron core 110. This adjustable electromagnetic force is achieved by outputting a set current through the DC power module 230, which magnetizes the control iron core 210 and applies an attractive or pushing force to the oil cup iron core 110, thereby adjusting the movement time of the oil cup iron core 110 towards the pole shoe 120.

[0097] These two damping forces—physical damping force and adjustable electromagnetic force—are superimposed to form a composite force. While retaining the inherent advantages of physical damping force, the electromagnetic force dynamically adjusts the delay effect, enabling precise control of the tripping response time. This also improves the overall stability and reliability of the system. By adjusting the output current of the intelligent control module 200, the intensity of the adjustable electromagnetic force can be flexibly adjusted, thereby fine-tuning the tripping time according to actual needs and meeting the protection requirements of different application scenarios.

[0098] In summary, this composite damping mechanism combines the physical damping of silicone oil with the adjustable electromagnetic force generated by the intelligent control module 200, significantly enhancing the adjustment capability and adaptability of the trip unit. It provides an efficient and reliable overcurrent protection solution, which not only optimizes the timing control of the tripping action but also improves the stability and durability of the equipment in complex environments.

[0099] Example 2

[0100] like Figure 2 As shown, the difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 provides an intelligent control module 200 with a different structure, which is described in detail below:

[0101] Preferably, the intelligent control module 200 is configured as follows:

[0102] The second coil 220 is wound around the outside of the oil cup core 110;

[0103] The DC power module 230 is electrically connected to the second coil 220. The DC power module 230 outputs a set current to make the second coil 220 generate a specific DC magnetic flux. The DC magnetic flux forms a second electromagnetic force applied to the oil cup core 110.

[0104] Unlike Embodiment 1, Embodiment 2 employs a circumferential magnetic coupling structure, where the second coil 220 is directly mounted on the outer periphery of the oil cup core 110. After being energized, an axially distributed DC magnetic field is established around the oil cup core 110. A second electromagnetic force is generated on the oil cup core 110 using the principle of electromagnetic induction. This second electromagnetic force is in the same or opposite direction to the first electromagnetic force generated by the first coil 140, achieving the same effect as the scheme in Embodiment 1.

[0105] Specifically, the plastic retaining sleeve 240 is fitted onto the end of the oil cup 100 and is used to install the second coil 220. In particular, one end of the oil cup core 110 extends into the plastic retaining sleeve 240 so that the DC magnetic flux generated by the second coil 220 is applied to the radial circumferential surface of the oil cup core 110.

[0106] This structural design eliminates the complex separation space in the independent control iron core 210 and plastic fixing sleeve 240, making the structure simpler and easier to assemble. At the same time, it reduces the number of parts, which helps to reduce manufacturing costs and improve reliability. Furthermore, by adjusting the output current of the DC power module 230, precise control of the second electromagnetic force can still be achieved, thereby enabling the adjustability of the tripping time.

[0107] Furthermore, it is worth mentioning that the two solutions provided in Embodiment 1 and Embodiment 2 apply different positions and strengths to the oil cup core 110, and can be applied to different characteristic curve requirements:

[0108] In Embodiment 1, the intelligent control module 200 controls the iron core 210 to generate a second electromagnetic force, which acts on the axial end face of the oil cup iron core 110, forming an end-face magnetic coupling structure. This design can provide a strong second electromagnetic force, which is suitable for situations where a large damping force is required to delay the movement of the oil cup iron core 110, and is particularly suitable for application scenarios with long tripping time requirements or large loads.

[0109] In Embodiment 2, the second coil 220 is directly wound around the outer circumferential surface of the oil cup core 110, and a second electromagnetic force is formed by radially applied DC magnetic flux. The electromagnetic force generated in this way is relatively uniform and has a wider range of action, making it suitable for scenarios requiring fine adjustment of the tripping response time. Due to its more compact structure and reduced number of parts, it is more suitable for applications with limited space or cost sensitivity.

[0110] These two solutions, through different mechanical layouts and electromagnetic force application methods, can meet diverse protection characteristics requirements. Users can choose the appropriate solution according to specific application scenarios to achieve the best overcurrent protection effect.

[0111] Whether strong electromagnetic damping force or precise time control is required, both designs offer flexible and efficient solutions, enhancing the circuit breaker's ability to adapt to different operating conditions.

[0112] The technical means disclosed in this invention are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

[0113] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0114] Furthermore, in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0115] The technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0116] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An adjustable oil-damped electromagnetic trip unit for use in circuit breakers, characterized in that, include: The oil damping matrix unit includes an oil cup, an axially movable oil cup core, a pole shoe disposed at the end of the oil cup, and a first coil wound around the outer wall of the oil cup. When the first coil is energized, a first electromagnetic force is generated to drive the oil cup core toward the pole shoe. An intelligent control module, located at the end of the oil cup, outputs a controllable DC current to generate a second electromagnetic force that is in the same or opposite direction to the first electromagnetic force. This second electromagnetic force acts on the iron core of the oil cup. By adjusting the magnitude and direction of the second electromagnetic force, the trip unit acquires rated current adjustment and overload protection adjustment functions. The rated current adjustment function is configured to: actively adjust the direction and magnitude of the second electromagnetic force to effectively change the combined ampere-turns of the first coil; The overload protection adjustment function is configured as follows: the intelligent control module automatically adjusts the direction and magnitude of the second electromagnetic force based on the real-time current of the first coil, so as to dynamically control the time when the oil cup core moves to the pole shoe.

2. The adjustable oil-damped electromagnetic trip unit for circuit breakers according to claim 1, characterized in that, 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 cause the second coil to 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.

3. The adjustable oil-damped electromagnetic trip unit for circuit breakers according to claim 2, characterized in that, The control core and the oil cup core are coaxially arranged. The second electromagnetic force generated by the control core acts on the axial end face of the oil cup core, forming an end face magnetic coupling structure.

4. The adjustable oil-damped electromagnetic trip unit for circuit breakers according to claim 2, characterized in that, The intelligent control module also includes a plastic fixing sleeve, which is fitted onto the end of the oil cup and used to install the control iron core and the second coil.

5. An adjustable oil-damped electromagnetic trip unit for circuit breakers according to claim 4, characterized in that, The plastic fixing sleeve is divided into a first installation space and a second installation space, wherein... The first mounting space is coaxially arranged with the oil cup core and is used to install the control core, and the shape of the first mounting space matches the control core to fix the control core. The second mounting space surrounds the outside of the first mounting space and is used to mount the second coil.

6. The adjustable oil-damped electromagnetic trip unit for circuit breakers according to claim 1, characterized in that, The intelligent control module is 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.

7. An adjustable oil-damped electromagnetic trip unit for circuit breakers according to claim 6, characterized in that, The DC magnetic flux generated by the second coil is applied to the radial circumferential surface of the oil cup core, forming a circumferential magnetic coupling structure.

8. An adjustable oil-damped electromagnetic trip unit for circuit breakers according to claim 6, characterized in that, The intelligent control module also includes a plastic retaining sleeve, which is fitted onto the end of the oil cup and used to install the second coil, wherein... One end of the oil cup core extends into the plastic retaining sleeve so that the DC magnetic flux generated by the second coil is applied to the radial circumferential surface of the oil cup core.

9. An adjustable oil-damped electromagnetic trip unit for use in circuit breakers 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.

10. An adjustable oil-damped electromagnetic trip unit for use in circuit breakers according to claim 9, 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.

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