Adjustable oil damping electromagnetic release applied to circuit breaker

Abstract

The invention discloses an adjustable oil damping electromagnetic release applied to a circuit breaker, and belongs to the technical field of release. Comprising an oil cup, an oil cup iron core capable of moving in the axial direction, a pole shoe arranged at the end of the oil cup and a first coil wound around the outer wall of the oil cup, and when the first coil is powered on, first electromagnetic force driving the oil cup iron core to move towards the pole shoe is generated; and the intelligent control module is arranged at the end part of the oil cup and is used for outputting controllable direct current to generate second electromagnetic force in the same direction or opposite direction as the first electromagnetic force, and the release has a rated current adjusting function and an overload protection adjusting function by adjusting the magnitude and the direction of the second electromagnetic force. The controllable second electromagnetic force is introduced into a traditional oil damping electromagnetic release, the rated current specification can be adjusted, the release action time can be adjusted, the advantage that the temperature stability of the oil damping release is good is reserved, and meanwhile the defect that the protection characteristic of the oil damping release cannot be adjusted is overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of releases, and in particular relates to an adjustable oil-damping electromagnetic release applied to a circuit breaker. Background Art

[0002] With the development of power systems and increasing user safety requirements for electrical equipment, circuit breakers, as key circuit protection components, have a direct impact on the stability and safety of the entire power system. Circuit breakers use trip units to implement overcurrent protection, but traditional trip units currently have certain limitations in practical applications.

[0003] 1. Thermal-electromagnetic release

[0004] Temperature sensitivity: The operating characteristics of thermal-electromagnetic releases are highly dependent on ambient temperature. Especially under extreme temperature conditions (such as below -40°C or above +85°C), 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 releases can only provide a limited selection of rated current specifications. They cannot meet the needs of the same circuit breaker for multiple selective current protection in specific situations, which limits their applicability in different application fields.

[0006] 2. Electronic trip unit

[0007] Cost and size issues: Although electronic trip units can meet a wider range of 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 damping electromagnetic release

[0010] Non-adjustable protection characteristics: Although traditional oil-damped electromagnetic releases can operate reliably over a wide temperature range (-40°C to +85°C) 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] The present invention aims to solve the above problems in the prior art and proposes an adjustable oil damping electromagnetic release with an adjustable overload protection function that is not affected by temperature.

[0012] The present invention can be achieved through the following technical solutions: An adjustable oil-damping electromagnetic release for a circuit breaker, comprising: An oil damping matrix unit, comprising an oil cup, an axially movable oil cup core, a pole shoe disposed at an end of the oil cup, and a first coil wound around an outer wall of the oil cup, wherein 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 is provided at the end of the oil cup and is used to output a controllable direct current to generate a second electromagnetic force in the same direction or opposite direction as the first electromagnetic force. The 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 is provided with a rated current adjustment function and an overload protection adjustment function. The rated current adjustment function is configured to: actively adjust the direction and magnitude of the second electromagnetic force to equivalently change the synthetic 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 to dynamically control the time for the oil cup core to move to the pole shoe.

[0013] As a further improvement of the present invention, the intelligent control module includes: a control iron core, which is close to the end surface of the oil cup iron core; a second coil wound outside the control iron core; A DC power supply module is electrically connected to the second coil, and outputs a set current through the DC power supply module to cause the second coil to generate a specific DC magnetic flux and magnetize the control iron core, and the control iron core generates the second electromagnetic force on the oil cup iron core.

[0014] As a further improvement of the present invention, the control core is coaxially arranged with the oil cup core, and the second electromagnetic force generated by the control core acts on the axial end face of the oil cup core to form an end face magnetic coupling structure.

[0015] As a further improvement of the present invention, the intelligent control module further includes a plastic fixing sleeve, which is sleeved on the end of the oil cup and is used to install the control iron core and the second coil.

[0016] As a further improvement of the present invention, the plastic fixing sleeve is divided into a first installation space and a second installation space, wherein: The first installation space is coaxially arranged with the oil cup core and is used to install the control core, and the shape of the first installation space matches the control core to fix the control core; The second installation space surrounds the outside of the first installation space and is used to install the second coil.

[0017] As a further improvement of the present invention, the intelligent control module is configured as follows: a second coil wound around the outside of the oil cup core; A DC power supply module is electrically connected to the second coil, and a set current is outputted by the DC power supply module to cause the second coil to generate a specific DC magnetic flux, which forms the second electromagnetic force applied to the oil cup core.

[0018] As a further improvement of the present invention, the DC magnetic flux generated by the second coil is applied to the radial circumference of the oil cup core to form a circumferential magnetic coupling structure.

[0019] As a further improvement of the present invention, the intelligent control module further includes a plastic fixing sleeve, which is sleeved on the end of the oil cup and is used to install the second coil, wherein: One end of the oil cup core extends into the plastic fixing sleeve so that the DC magnetic flux generated by the second coil is applied to the radial circumferential surface of the oil cup core.

[0020] As a further improvement of the present invention, the oil cup is filled with silicone oil, and during the axial movement of the oil cup iron core, the flow of the silicone oil generates a physical damping force on the movement of the oil cup iron core; The second electromagnetic force generated by the intelligent control module generates an adjustable electromagnetic force on the movement of the oil cup iron core.

[0021] As a further improvement of the present invention, the physical damping force is superimposed on the adjustable electromagnetic force to form a composite force, and the composite force is used to accelerate or delay the time for the oil cup core to move toward the pole shoe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The stability of the entire temperature range is significantly improved and the limit of non-adjustable protection characteristics is broken Combining the low temperature sensitivity of silicone oil with the zero temperature drift characteristics of electromagnetic damping ensures consistent tripping action under extreme ambient temperatures, overcoming the temperature dependence of thermal-electromagnetic trip units. At the same time, the intelligent control module outputs controllable DC current to generate electromagnetic force in the same or opposite direction, realizing the continuous adjustment of the action time of the oil damping release for the first time. Users can flexibly set the protection characteristics according to their needs, solving the industry pain point of fixed protection parameters of traditional oil damping solutions.

[0024] 2. Rated current specifications are adjustable The user actively adjusts the direction and magnitude of the second electromagnetic force to equivalently change the synthetic ampere-turns of the first coil to meet the requirements of different rated current specifications, thereby adapting to different usage scenarios.

[0025] 3. Precise control of tripping response The physical damping force of silicone oil and the adjustable electromagnetic force of the intelligent control module form a composite effect. While retaining the inherent advantages of oil damping, the delay effect is dynamically adjusted through electromagnetic force to achieve precise time control. This not only delays the movement time of the oil cup core, but also achieves precise control of the tripping response time.

[0026] 4. Dual solutions adapt to multiple scenarios The first embodiment is suitable for situations where a larger damping force is required to delay the movement of the oil cup core, and is particularly suitable for application scenarios that require a longer tripping time or a larger load. The second embodiment is more suitable for space-limited or cost-sensitive application environments due to its compact design and can meet diverse protection requirements.

[0027] 5. Efficient magnetic circuit optimizes response speed The first embodiment adopts an end-face magnetic coupling structure to ensure the shortest magnetic flux path and the lowest loss, thereby improving the magnetic field efficiency and system response speed; In the second embodiment, a circumferential magnetic coupling structure is used to tightly surround the oil cup core with the second coil, thereby optimizing the magnetic flux path and improving the uniformity and stability of the magnetic field.

[0028] 6. Compact structure and cost optimization The intelligent control module is integrated into a plastic fixed sleeve with a simple and compact structure, which reduces the volume of the entire trip unit and facilitates integration into miniaturized or compact circuit breakers. This conforms to the development trend of miniaturization of modern electrical equipment. At the same time, it does not require complex electronic components, further reducing production and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of an adjustable oil damping electromagnetic release according to a first embodiment of the present invention; Figure 2 It is a cross-sectional view of an adjustable oil-damping electromagnetic release according to a second embodiment of the present invention.

[0030] In the figure, 100, oil cup; 110, oil cup core; 120, pole shoe; 130, oil cup spring; 140, first coil; 150, yoke; 160, armature; 170, armature spring; 200 , intelligent control module; 210 , control core; 220 , second coil; 230 , DC power supply module; 240 , plastic fixing sleeve; 241 , first installation space; 242 , second installation space. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.

[0032] Example 1

[0033] like Figure 1 As shown, the present invention provides an adjustable oil damping electromagnetic release for a circuit breaker, comprising: The oil damping base unit includes an oil cup 100, an axially movable oil cup core 110, a pole piece 120 disposed at the end of the oil cup 100, an oil cup spring 130 disposed within the oil cup 100, and a first coil 140 wound around the outer wall of the oil cup 100. When energized, the first coil 140 generates a first electromagnetic force that drives the oil cup core 110 toward the pole piece 120. (The oil damping base unit, in conjunction with the yoke 150, armature 160, and armature spring 170, forms a complete oil damping electromagnetic release.) The intelligent control module 200 is provided at the end of the oil cup 100 and is used to output a controllable DC current to generate a second electromagnetic force in the same direction or opposite direction as the first electromagnetic force. The second electromagnetic force acts on the oil cup core 110. By adjusting the magnitude and direction of the second electromagnetic force, the trip unit has the rated current adjustment function and the overload protection adjustment function. 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 equivalently change the resultant ampere-turns of the first coil 140 to meet the requirements of different rated current specifications. For example, if the rated current of the first coil 140 is 40A, but the supporting equipment requires a rated current of 60A, the second electromagnetic force is set in the same direction as the first electromagnetic force and acts on the oil cup core to compensate for the 20A rated current difference. The same principle applies vice versa, thus flexibly adapting to various application scenarios. 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 loop 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 size of the second electromagnetic force to dynamically control the time it takes for the oil cup core 110 to move to the pole shoe 120, thereby achieving overload protection characteristic adjustment, that is, achieving controllable adjustment of the tripping action time; In the case of a continuous overload, the intelligent control module 200 adjusts the direction of the second electromagnetic force to be opposite to the first electromagnetic force, delaying the tripping time to avoid false tripping caused by a short-term overload or starting current; In the case of a short circuit, the intelligent control module 200 adjusts the direction of the second electromagnetic force to be the same as the first electromagnetic force, further improving the tripping speed and ensuring the reliability of instantaneous protection.

[0034] It is worth mentioning that it is through the introduction of a second electromagnetic force into the traditional oil-damped electromagnetic release that the tripping action time is made adjustable, predictable, and repeatable. This not only retains the advantages of the oil-damped release, such as simple structure, good temperature stability, and strong anti-interference ability, but also makes up for the shortcoming of its non-adjustable overload protection characteristics.

[0035] In addition, compared with the current traditional oil-damped electromagnetic release, thermal-electromagnetic release, and electronic release, the adjustable oil-damped electromagnetic release provided in this embodiment solves the defects of the above three releases: 1. Problems with the non-adjustable protection characteristics of traditional oil-damped electromagnetic releases: Although traditional oil-damped electromagnetic releases can operate within a wide temperature range, their overcurrent protection characteristics are usually fixed and cannot be adjusted according to specific application requirements.

[0036] The adjustable oil-damped electromagnetic release provided in this embodiment introduces an intelligent control module 200, which generates a unidirectional or reverse electromagnetic force by outputting a set DC current, thereby accelerating or delaying the movement time of the oil cup core 110, thereby achieving precise control of the tripping response time. The user can flexibly adjust the protection characteristics of the release according to actual needs, thereby enhancing the adaptability and flexibility of the equipment and meeting the needs of different application scenarios. In addition, the adjustable overload protection function is not affected by temperature.

[0037] 2. Temperature sensitivity of thermal-electromagnetic release: The operating characteristics of traditional thermal-electromagnetic releases are highly dependent on the ambient temperature and may not work stably under extreme temperature conditions (such as below -40°C or above +85°C).

[0038] The adjustable oil-damped electromagnetic release provided in this embodiment uses silicone oil as the damping medium. Silicone oil has a low viscosity temperature variation coefficient, which enables the release to operate stably in a wide temperature range of -40°C to +85°C. In addition, the introduced intelligent control module 200 is also not affected by temperature.

[0039] 3. Cost and size issues of electronic trip units: 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.

[0040] In general, the adjustable oil-damped electromagnetic release provided in this embodiment detects the loop current and compares the electromagnetic force of the first coil 140 to provide the corresponding current direction and current magnitude of the second coil 220, thereby enabling the selection of multiple rated current specifications. In addition, the intelligent control module 200 is used to achieve precise control of the tripping response time, eliminating the need for complex electronic components, reducing manufacturing costs and equipment size, while maintaining high-precision current setting capabilities and flexible protection characteristic adjustment capabilities.

[0041] In general, the adjustable oil-damped electromagnetic release provided in this embodiment, by combining oil damping technology and the intelligent control module 200, not only solves the temperature sensitivity, cost and volume problems, and the problems of non-adjustable protection characteristics in the prior art, but also significantly improves the performance and applicability of the circuit breaker.

[0042] This innovative design provides a more reliable, efficient and economical circuit protection solution for the power system, greatly improves the safety and stability of electrical equipment, and provides a highly reliable, highly adaptable and low-cost intelligent protection solution for medium and low voltage circuit breakers.

[0043] Preferably, the intelligent control module 200 is configured as follows: The control core 210 is close to the end surface of the oil cup core 110; a second coil 220 wound outside the control core 210; The DC power supply module 230 is electrically connected to the second coil 220. The DC power supply module 230 outputs a set current to cause the second coil 220 to generate a specific DC magnetic flux and magnetize the control core 210. The control core 210 generates an attractive force or thrust (i.e., a second electromagnetic force) on the oil cup core 110, thereby adjusting the speed at which the oil cup core 110 moves toward the pole shoe 120.

[0044] The operating principle is described as follows: When an overcurrent occurs in the circuit breaker's main circuit, the first coil 140 (main excitation coil) is energized to generate a first electromagnetic force, driving the oil cup core 110 to accelerate toward the pole shoe 120. Simultaneously, based on preset protection characteristics, the DC power supply module 230 outputs a controllable DC current to the second coil 220, which creates a stable DC magnetic flux in the control core 210. Since the control core 210 and the end faces of the oil cup core 110 are opposite to each other, the control core 210 generates an axial positive thrust or negative suction force (i.e., the second electromagnetic force) on the oil cup core 110. The second electromagnetic force acts on the initial stage and acceleration of the movement of the oil cup core 110. 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 accurately controlled, thereby achieving adjustable tripping action time.

[0045] Furthermore, the control core 210 is coaxially arranged with the oil cup core 110. 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 by the DC power supply module 230, the intensity of the second electromagnetic force can be flexibly adjusted, achieving fine control of the tripping time and meeting the protection characteristics required in different application scenarios. 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 components involved in the adjustment process, it only relies on stable electromagnetic effects for control, which greatly reduces the failure rate and improves the long-term operation stability and reliability of the system.

[0046] Furthermore, the following is an overall layout description of the intelligent control module 200 in this embodiment: The intelligent control module 200 further includes a plastic fixing sleeve 240 , which is sleeved on the end of the oil cup 100 and used to mount the control iron core 210 and the second coil 220 , thereby ensuring the structural stability and electromagnetic performance of the entire intelligent control module 200 .

[0047] Specifically, the plastic fixing sleeve 240 is divided into a first installation space 241 and a second installation space 242, wherein: The first mounting space 241 is coaxially arranged with the oil cup core 110 and is used to mount 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, firmly securing the control core 210 and preventing displacement or deflection during operation, thereby ensuring the stability of the magnetic field and the effective transmission of the electromagnetic force. The second installation space 242 surrounds the outside of the first installation space 241 and is used to install the second coil 220. This surround design allows the second coil 220 to tightly surround the control iron core 210, optimizes the magnetic flux path, and improves the magnetic field efficiency. In addition, by placing the second coil 220 in an independent second installation space 242, not only can good electrical isolation be achieved to avoid external interference, but it can also provide additional physical protection for the coil and extend its service life.

[0048] Overall, this layout not only optimizes the magnetic field path, reduces air gaps and magnetic resistance, but also ensures the efficient transmission of the second electromagnetic force, improving the accuracy and response speed of tripping time adjustment. At the same time, the modular layout simplifies the assembly process, reduces production costs, and provides good sealing, thereby improving the equipment's protection level and long-term operational reliability.

[0049] It is also worth mentioning that the adjustable oil damping electromagnetic release provided in this embodiment also has a composite damping force, which further enhances its control accuracy and flexibility, as described in detail below: First, the oil cup 100 is filled with silicone oil. When the oil cup core 110 is driven axially by the first electromagnetic force under overcurrent conditions, the flow of silicone oil creates a physical damping force on the oil cup core 110. This physical damping force slows down the movement of the oil cup core 110 through the viscous resistance of the liquid, thus providing a time delay. Furthermore, the viscosity of silicone oil is less affected by temperature changes, ensuring consistent performance of the trip unit over a wide temperature range. Secondly, the second electromagnetic force generated by the intelligent control module 200 generates an adjustable electromagnetic force on the movement of the oil cup core 110. This adjustable electromagnetic force is achieved by magnetizing the control core 210 by outputting a set current through the DC power supply module 230, applying an attractive force or a thrust to the oil cup core 110, thereby adjusting the movement time of the oil cup core 110 toward the pole shoe 120. The 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 delay effect is dynamically adjusted by electromagnetic force, thereby achieving precise control of the tripping response time and improving 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 to meet the protection requirements in different application scenarios.

[0050] 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 and providing an efficient and reliable overcurrent protection solution. It not only optimizes the time control of the tripping action, but also improves the stability and durability of the equipment in complex environments.

[0051] Example 2

[0052] like Figure 2 As shown, the difference between the second embodiment and the first embodiment is that the second embodiment provides an intelligent control module 200 of another structure, which is described in detail as follows: Preferably, the intelligent control module 200 is configured as follows: The second coil 220 is wound around the outside of the oil cup core 110; The DC power supply module 230 is electrically connected to the second coil 220 . The DC power supply module 230 outputs a set current to enable the second coil 220 to generate a specific DC magnetic flux. The DC magnetic flux forms a second electromagnetic force applied to the oil cup core 110 .

[0053] Unlike the first embodiment, the second embodiment adopts a circumferential magnetic coupling structure, that is, the second coil 220 is directly mounted on the outer periphery of the oil cup core 110. After power is applied, an axially distributed DC magnetic field is established around the oil cup core 110, and a second electromagnetic force is generated on the oil cup core 110 using the principle of electromagnetic induction. The direction of this second electromagnetic force is the same as or opposite to the direction of the first electromagnetic force generated by the first coil 140, achieving the same effect as the solution in the first embodiment.

[0054] Specifically, the plastic fixing sleeve 240 is sleeved on 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 fixing sleeve 240 so that the DC magnetic flux generated by the second coil 220 is applied to the radial circumference of the oil cup core 110.

[0055] This structural design eliminates the complex separation space in the independent control iron core 210 and the plastic fixing sleeve 240, making the structure simpler and easier to assemble. At the same time, it reduces the number of parts, which is conducive to reducing manufacturing costs and improving reliability. By adjusting the output current of the DC power supply module 230, the second electromagnetic force can still be precisely controlled, thereby achieving adjustability of the tripping time.

[0056] It is also worth mentioning that the two solutions provided in Example 1 and Example 2 act on the oil cup core 110 at different positions and intensities, and can be applied to different characteristic curve requirements: In the first embodiment, the intelligent control module 200 generates a second electromagnetic force by controlling the iron core 210, which acts on the axial end face of the oil cup iron core 110, forming an end-face magnetic coupling structure. This design provides a stronger second electromagnetic force and is suitable for applications requiring a larger damping force to slow the movement of the oil cup iron core 110, particularly those requiring a longer trip time or heavy loads. In the second embodiment, the second coil 220 is wound directly around the outer circumference of the oil cup core 110, generating a second electromagnetic force through radially applied DC magnetic flux. This method generates a relatively uniform electromagnetic force with a wider range of action, making it suitable for scenarios requiring fine-tuning of trip response time. Its more compact structure and reduced component count make it more suitable for space-constrained or cost-sensitive applications.

[0057] These two solutions can meet diverse protection requirements through different mechanical layouts and electromagnetic force application methods. Users can choose the appropriate solution based on the specific application scenario to achieve the best overcurrent protection effect.

[0058] Whether strong electromagnetic damping force or precise timing control is required, these two designs can provide flexible and efficient solutions, enhancing the circuit breaker's ability to adapt to different working conditions.

[0059] The technical means disclosed in the solutions of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical solutions composed of any combination of the above technical features. The above is a specific embodiment of the present invention. It should be noted that for those skilled in the art, without departing from the principles of the present invention, various improvements and modifications can be made, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

[0060] 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 position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0061] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0062] The technical solutions between the various embodiments of the present invention can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An adjustable oil damping electromagnetic release for a circuit breaker, characterized in that: include: An oil damping matrix unit, comprising an oil cup, an axially movable oil cup core, a pole shoe disposed at an end of the oil cup, and a first coil wound around an outer wall of the oil cup, wherein 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 is provided at the end of the oil cup and is used to output a controllable direct current to generate a second electromagnetic force in the same direction or opposite direction as the first electromagnetic force. The 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 is provided with a rated current adjustment function and an overload protection adjustment function. The rated current adjustment function is configured to: actively adjust the direction and magnitude of the second electromagnetic force to equivalently change the synthetic 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 to dynamically control the time for the oil cup core to move to the pole shoe.

2. The adjustable oil damping electromagnetic release for circuit breaker according to claim 1, characterized in that: The intelligent control module is configured as follows: a control iron core, which is close to the end surface of the oil cup iron core; a second coil wound outside the control iron core; A DC power supply module is electrically connected to the second coil, and outputs a set current through the DC power supply module to cause the second coil to generate a specific DC magnetic flux and magnetize the control iron core, and the control iron core generates the second electromagnetic force on the oil cup iron core.

3. The adjustable oil damping electromagnetic release for circuit breaker according to claim 2, characterized in that: The control iron core is coaxially arranged with the oil cup iron core, and the second electromagnetic force generated by the control iron core acts on the axial end face of the oil cup iron core to form an end face type magnetic coupling structure.

4. The adjustable oil damping electromagnetic release for circuit breaker according to claim 2, characterized in that: The intelligent control module further comprises a plastic fixing sleeve, which is sleeved on the end of the oil cup and is used for mounting the control iron core and the second coil.

5. The adjustable oil damping electromagnetic release for circuit breaker 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 installation space is coaxially arranged with the oil cup core and is used to install the control core, and the shape of the first installation space matches the control core to fix the control core; The second installation space surrounds the outside of the first installation space and is used to install the second coil.

6. The adjustable oil damping electromagnetic release for circuit breaker according to claim 1, characterized in that: The intelligent control module is configured as follows: a second coil wound around the outside of the oil cup core; A DC power supply module is electrically connected to the second coil, and a set current is outputted by the DC power supply module to cause the second coil to generate a specific DC magnetic flux, which forms the second electromagnetic force applied to the oil cup core.

7. The adjustable oil damping electromagnetic release for circuit breaker according to claim 6, characterized in that: The DC magnetic flux generated by the second coil is applied to the radial circumference of the oil cup core to form a circumferential magnetic coupling structure.

8. The adjustable oil damping electromagnetic release for circuit breaker according to claim 6, characterized in that: The intelligent control module further includes a plastic fixing sleeve, which is sleeved on 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 fixing 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. The adjustable oil damping electromagnetic release for circuit breaker according to claim 1, characterized in that: The oil cup is filled with silicone oil, and during the axial movement of the oil cup core, the flow of the silicone oil generates a physical damping force on the movement of the oil cup core; The second electromagnetic force generated by the intelligent control module generates an adjustable electromagnetic force on the movement of the oil cup iron core.

10. The adjustable oil damping electromagnetic release for circuit breaker 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 time for the oil cup iron core to move toward the pole shoe.

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