Anti-demagnetization bistable quick release for elastic operation mechanism

Abstract

The invention relates to an anti-demagnetization bistable quick release for an elastic operation mechanism, which is characterized by comprising an anti-demagnetization double-magnet unit, an armature unit, a coil unit and a self-adaptive pulse control system, and is characterized in that the anti-demagnetization double-magnet unit comprises a main permanent magnet, an auxiliary permanent magnet, a magnetic conductive yoke and an iron core; the main permanent magnet, the auxiliary permanent magnet and the coil unit are all assembled and connected with the magnetic conductive yoke to form a magnetic circuit loop, and the main permanent magnet and the auxiliary permanent magnet are connected in parallel to play a role in demagnetization resistance. And the magnetic conductive yoke is provided with an air gap, and a magnetic field at the air gap is used for adsorbing the armature and realizing the tripping action. When the device is matched with the circuit breaker for use, the tripping speed, the operation stability and the opening action consistency of the circuit breaker can be improved.

Description

Technical Field

[0001] This invention specifically relates to an anti-demagnetizing bistable fast trip unit for a spring-loaded operating mechanism, belonging to the technical field of power equipment operating mechanisms. Background Technology

[0002] In the field of power equipment, when anomalies (such as overcurrent, short circuit, undervoltage, etc.) are detected, it is necessary to quickly disconnect the circuit breaker. In recent years, due to the upgrading of power equipment, the requirements for the reliability and response speed of the trip unit have become increasingly higher. Therefore, it is necessary to develop a fast trip unit that is faster and more reliable, while also having the advantages of good anti-demagnetization capability, high consistency of tripping action, and low energy consumption.

[0003] Currently, traditional electromagnetic trip units are widely used in spring-operated mechanisms due to their simple structure and low cost. Their principle is electromagnetic drive; energizing a coil generates electromagnetic force, which drives the armature to move, thereby achieving the tripping action.

[0004] Electromagnetic trip units require a continuous current input to maintain the magnetic field and must be de-energized and reset after operation. Traditional electromagnetic trip units rely on instantaneous peak current for drive, placing high demands on power supply capacity. Prolonged operation can easily lead to coil overheating, potentially affecting lifespan and stability. Furthermore, response speed also depends on current rise time; while tripping is fast under high current, power fluctuations can also affect it, generally making them suitable for low-cost, low-frequency operation scenarios. However, as power equipment demands increasingly faster tripping speeds and energy efficiency, electromagnetic trip units are finding it increasingly difficult to meet these requirements. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-demagnetizing bistable fast trip unit for a spring-operated mechanism that, when used in conjunction with a circuit breaker, can improve the tripping speed, operational stability, and consistency of the opening action of the circuit breaker.

[0006] To achieve the above objectives, the technical solution of this invention is: an anti-demagnetizing bistable fast release device for a spring-loaded mechanism, the innovation of which lies in: including an anti-demagnetizing dual magnet unit, an armature unit, a coil unit, and an adaptive pulse control system.

[0007] The anti-demagnetizing dual-magnet unit includes a main permanent magnet, an auxiliary permanent magnet, a magnetically conductive yoke, and an iron core. Both the main and auxiliary permanent magnets are assembled and connected to the magnetically conductive yoke, and are arranged symmetrically along the yoke. The magnetically conductive yoke has an air gap, and two iron cores arranged opposite each other are located on the yoke and at the air gap. A complete magnetic flux loop is constructed from the main permanent magnet, auxiliary permanent magnet, magnetically conductive yoke, iron core, and air gap.

[0008] The armature unit includes an armature and an armature base. The armature is slidably fitted with the armature base, and the head of the armature is located within the air gap of the magnetic yoke. The air gap magnetic field generated at the air gap is used to attract the armature or cause the armature to trip.

[0009] The coil unit includes a coil mounted on a magnetic yoke and positioned between a main permanent magnet and an auxiliary permanent magnet. The coil is electrically connected to an adaptive pulse control system, which outputs a tripping current and dynamically adjusts the current flowing into the coil.

[0010] When there is no current in the coil, the magnetic flux circuit contains only the magnetic flux generated by the main permanent magnet and the auxiliary permanent magnet, which are connected in parallel to supply magnetism to the air gap. At this time, the superposition of magnetic flux forms an air gap magnetic field, causing the armature to be attracted to the air gap.

[0011] When the tripping action is initiated, the adaptive pulse control system supplies a tripping current to the coil. At this time, the magnetomotive force generated by the coil is connected in series with the magnetomotive force of the main permanent magnet, forming a superimposed magnetic flux in opposite directions. That is, the coil generates a magnetic flux opposite in direction to both the main and auxiliary permanent magnets, and the magnitude of this flux is the same as the original flux in the magnetic flux loop. The two cancel each other out, causing the air gap magnetic field at the air gap to disappear and lose its attraction to the armature. The armature then slides relative to the armature holder away from the air gap, completing the tripping action.

[0012] When the tripping action is completed and the coil is reset, the adaptive pulse control system supplies the current in the opposite direction to that during the tripping action to the coil again. At this time, the direction of the magnet generated by the coil in the magnetic flux circuit is the same as the magnetic flux direction of the main permanent magnet and the auxiliary permanent magnet, which strengthens the air gap magnetic field at the air gap and causes the armature to be attracted to the air gap again.

[0013] In the above technical solution, the magnetic yoke includes a left yoke, a right yoke, and a lower yoke. The left and right yokes are arranged on both sides of the lower yoke. The coil is located on the lower yoke. The main permanent magnet is located between one end of the left and lower yokes. The auxiliary permanent magnet is located between the other end of the right and lower yokes. The free ends of the left and right yokes are arranged opposite each other with a gap, and this gap forms an air gap. At the same time, an iron core is provided at the end face of the free end of each of the left and right yokes.

[0014] In the above technical solution, both the left and right magnetic yokes are L-shaped magnetic yokes, and the lower magnetic yoke is a U-shaped magnetic yoke.

[0015] In the above technical solution, the iron core is combined with the inner surfaces of the left and right magnetic yokes, and the cross-sectional area of ​​the outer surfaces of the left and right magnetic yokes is smaller than the cross-sectional area of ​​the inner surfaces, in order to enhance the magnetic field strength at the air gap.

[0016] In the above technical solution, a sliding groove is provided at the center of the armature seat, the armature is disposed in the sliding groove of the armature seat, and the armature and the sliding groove of the armature seat are in sliding engagement.

[0017] In the above technical solution, the main permanent magnet is a high coercivity permanent magnet, and the main permanent magnet is a neodymium iron boron permanent magnet or a samarium iron nitrogen permanent magnet. The auxiliary permanent magnet is a magnetic temperature compensation alloy, and the auxiliary permanent magnet is an AlNiCo permanent magnet or a samarium cobalt permanent magnet.

[0018] In the above technical solution, the coil unit further includes a coil frame, the coil is wound on the coil frame, and the coil frame is fitted onto a magnetic yoke.

[0019] In the above technical solution, the main permanent magnet is also provided with a temperature sensor for monitoring temperature, and the temperature sensor is electrically connected to the adaptive pulse control system.

[0020] In the above technical solution, the formula for calculating the tripping current output by the adaptive pulse control system is:

[0021]

[0022] Where L is the inductance of the coil, T is the temperature compensation coefficient of the coil, and k is the proportional coefficient.

[0023] In the above technical solution, the formula for calculating the proportionality coefficient k is:

[0024] k = k m ·k μ ·k f ·k s

[0025] Where, k m k is the magnetic circuit efficiency coefficient. μ k is the characteristic coefficient of the magnetic material. f k is the dynamic force coefficient. s This represents the system safety margin coefficient.

[0026] In the above technical solution, the tripping current output by the adaptive pulse control system is a gradient pulse current, which is divided into two segments: the first segment is a high-amplitude pulse and the second segment is a low-amplitude pulse. This is used to achieve precise control of the armature's movement trajectory and avoid bouncing. The magnetic flux induced by the high-amplitude pulse in the coil is completely canceled out by the sum of the magnetic fluxes of the main permanent magnet and the auxiliary permanent magnet. The ratio of the high-amplitude pulse to the low-amplitude pulse is 3:1 to 5:1, and the duration ratio is 1:3 to 1:5.

[0027] In the above technical solution, the adaptive pulse control system includes an intelligent monitoring module and a current regulation module that form a closed-loop control of the coil and are electrically connected. One end of the coil is electrically connected to the corresponding connection terminal of the intelligent monitoring module, and the intelligent monitoring module is used to monitor the current in the coil. The other end of the coil is electrically connected to the current regulation module, and the current regulation module is used to dynamically regulate the current output by the coil.

[0028] The above technical solution also includes a base plate, on which the anti-demagnetizing dual magnet unit, armature unit, coil unit and adaptive pulse control system are all mounted.

[0029] The positive effects of this invention are: by employing the anti-demagnetizing bistable fast trip device for the spring-loaded mechanism of this invention, since this invention includes an anti-demagnetizing dual magnet unit, an armature unit, a coil unit, and an adaptive pulse control system,

[0030] The anti-demagnetization dual-magnet unit includes a main permanent magnet, an auxiliary permanent magnet, a magnetically conductive yoke, and an iron core. Both the main and auxiliary permanent magnets are assembled and connected to the magnetically conductive yoke, and are symmetrically arranged along the yoke. The magnetically conductive yoke has an air gap, and a [missing information - likely a design element] is located on the yoke at the air gap.

[0031] It has two iron cores arranged opposite each other, and a complete magnetic flux circuit is constructed by the main permanent magnet, the auxiliary permanent magnet, the magnetically conductive yoke, the iron core and the air gap.

[0032] The armature unit includes an armature and an armature base. The armature is slidably fitted with the armature base, and the head of the armature is located within the air gap of the magnetic yoke. The air gap magnetic field generated at the air gap is used to attract the armature or cause the armature to trip.

[0033] The coil unit includes a coil mounted on a magnetic yoke and positioned between a main permanent magnet and an auxiliary permanent magnet. The coil is electrically connected to an adaptive pulse control system, which outputs a tripping current and dynamically adjusts the current flowing into the coil.

[0034] When there is no current in the coil, the magnetic flux circuit contains only the magnetic flux generated by the main permanent magnet and the auxiliary permanent magnet, which are connected in parallel to supply magnetism to the air gap. At this time, the superposition of magnetic flux forms an air gap magnetic field, causing the armature to be attracted to the air gap.

[0035] When the tripping action is initiated, the adaptive pulse control system supplies a tripping current to the coil. At this time, the magnetomotive force generated by the coil is connected in series with the magnetomotive force of the main permanent magnet, forming a superimposed magnetic flux in opposite directions. That is, the coil generates a magnetic flux opposite in direction to both the main and auxiliary permanent magnets, and the magnitude of this flux is the same as the original flux in the magnetic flux loop. The two cancel each other out, causing the air gap magnetic field at the air gap to disappear and lose its attraction to the armature. The armature then slides relative to the armature holder away from the air gap, completing the tripping action.

[0036] Upon completion of the tripping reset, the adaptive pulse control system supplies the coil with a current in the opposite direction to that during the tripping. At this time, the direction of the magnet generated by the coil in the magnetic flux circuit is the same as the magnetic flux direction of the main permanent magnet and the auxiliary permanent magnet, strengthening the air gap magnetic field at the air gap and causing the armature to be attracted to the air gap again.

[0037] The "bistable" nature of this invention is reflected in the following two aspects:

[0038] 1. The permanent magnet achieves self-holding of the latching state with zero power consumption, realizing a "magnetic latch" instead of a mechanical latch;

[0039] 2. Control the pulse current to ensure that the speed and trajectory of the armature during the tripping process are within a controllable range.

[0040] Specifically, this invention utilizes a permanent magnet to provide a constant magnetic field, resulting in a faster response time (microseconds). The direction of the magnetic field is changed by controlling the polarity current of the coil, thereby driving the armature. Only a short-duration pulse current (to change the magnetic field polarity) is needed for operation, eliminating the need for continuous power supply. The permanent magnet's magnetic field is persistent, achieving a self-locking function through its "magnetic holding" characteristic. Only an instantaneous pulse current is required to trigger the action, resulting in extremely low energy consumption (typically about 10%-20% of electromagnetic drives). It generates little heat, making it suitable for high-frequency operation or long-term standby scenarios. Attached Figure Description

[0041] Figure 1 This is a three-dimensional structural schematic diagram of a specific embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the circuit principle of the adaptive pulse control system of the present invention;

[0043] Figure 3 This is a flowchart illustrating the tripping process of the present invention. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and the given embodiments, but is not limited thereto.

[0045] This invention provides further explanation of the technical terms involved:

[0046] Spring-operated mechanism: The spring-operated mechanism is the core mechanical device in electrical equipment that enables rapid opening and closing of circuits. It utilizes the physical characteristics of spring energy storage and release to ensure the speed and reliability of circuit protection. It is mainly used in circuit breakers, disconnect switches, and other equipment. Its core function is to ensure that the current is quickly cut off in the event of a circuit fault (such as a short circuit or overload), protecting equipment and personnel safety.

[0047] Trip Unit: A trip unit is a device mechanically connected to a circuit breaker to release the holding mechanism and automatically disconnect the circuit breaker. The trip unit plays the role of a "protective actuator" in the operating mechanism, ensuring reliable disconnection of the circuit breaker in the event of a fault through real-time monitoring, rapid triggering, and energy release. It is a key component for power system safety.

[0048] like Figure 1 , 2 As shown in Figure 3, a demagnetizing bistable fast trip unit for a spring-loaded mechanism includes a demagnetizing dual magnet unit 1, an armature unit 2, a coil unit 3, and an adaptive pulse control system 4.

[0049] The anti-demagnetization dual-magnet unit 1 includes a main permanent magnet 11, an auxiliary permanent magnet 12, a magnetically conductive yoke 13, and an iron core 14. Both the main permanent magnet 11 and the auxiliary permanent magnet 12 are assembled and connected to the magnetically conductive yoke 13, and are symmetrically arranged along the yoke 13. The yoke 13 has an air gap 15, and two iron cores 14 arranged opposite each other are located on the yoke 13 at the air gap 15. A complete magnetic flux loop is constructed from the main permanent magnet 11, the auxiliary permanent magnet 12, the magnetically conductive yoke 13, the iron core 14, and the air gap 15.

[0050] The armature unit 2 includes an armature 21 and an armature seat 22. The armature 21 is slidably engaged with the armature seat 22, and the head of the armature 21 is located within the air gap 15 of the magnetic yoke 13. The air gap magnetic field generated at the air gap 15 is used to attract the armature 21 or to cause the armature 21 to perform a tripping action.

[0051] The coil unit 3 includes a coil 31, which is mounted on the magnetic yoke 13 and located between the main permanent magnet 11 and the auxiliary permanent magnet 12. The coil 31 is electrically connected to the adaptive pulse control system 4, which is used to output the tripping current and to dynamically adjust the current flowing into the coil 31.

[0052] When there is no current in the coil 31, the magnetic flux circuit is only filled with magnetic flux generated by the main permanent magnet 11 and the auxiliary permanent magnet 12, which are connected in parallel to supply magnetism to the air gap 15. At this time, the magnetic flux is superimposed to form an air gap magnetic field at the air gap 15, causing the armature 21 to be attracted to the air gap 15.

[0053] When the tripping action is performed, the adaptive pulse control system 4 supplies a tripping current to the coil 31. At this time, the magnetomotive force generated by the coil 31 is connected in series with the magnetomotive force of the main permanent magnet 11, forming a superimposed magnetic flux in opposite directions. That is, the coil 31 generates a magnetic flux in the opposite direction to that of the main permanent magnet 11 and the auxiliary permanent magnet 12, and the magnitude of the magnetic flux is the same as the original magnetic flux in the magnetic flux circuit. The two cancel each other out, causing the air gap magnetic field at the air gap 15 to disappear and lose its attraction force on the armature 21. The armature 21 slides relative to the armature seat 22 and away from the air gap 15, completing the tripping action.

[0054] When the tripping action is completed and reset, the adaptive pulse control system 4 supplies the current in the opposite direction to that during the tripping action to the coil 31 again. At this time, the direction of the magnet generated by the coil 31 in the magnetic flux circuit is the same as the magnetic flux direction of the main permanent magnet 11 and the auxiliary permanent magnet 12, which strengthens the air gap magnetic field at the air gap 15 and causes the armature 21 to be attracted to the air gap 15 again.

[0055] Furthermore, such as Figure 1 As shown, in order to make the structure of the present invention more reasonable, the layout more optimized, and to ensure the integrity of the magnetic flux circuit, the magnetic yoke 13 includes a left yoke 131, a right yoke 132 and a lower yoke 133. The left yoke 131 and the right yoke 132 are arranged on both sides of the lower yoke 133. The coil 31 is provided on the lower yoke 133. The main permanent magnet 11 is provided between one end of the left yoke 131 and the lower yoke 133. The auxiliary permanent magnet 12 is provided between the other end of the right yoke 132 and the lower yoke 133. The free ends of the left yoke 131 and the right yoke 132 are arranged opposite each other with a gap, and this gap forms an air gap 15. At the same time, the free end face of the left yoke 131 and the right yoke 132 are provided with iron cores 14.

[0056] Furthermore, such as Figure 1 As shown, in order to facilitate the assembly of the magnetic yoke, the left magnetic yoke 131 and the right magnetic yoke 132 are both L-shaped magnetic yokes, and the lower magnetic yoke 133 is a U-shaped magnetic yoke.

[0057] Furthermore, such as Figure 1 As shown, in order to strengthen the magnetic field strength at the air gap, the outer side of the iron core is processed into a structure with a reduced diameter. That is, the iron core 14 is combined with the inner side of the left magnetic yoke 131 and the right magnetic yoke 132, and the cross-sectional area of ​​the outer side of the left magnetic yoke 131 and the right magnetic yoke 132 is smaller than the cross-sectional area of ​​the inner side, in order to strengthen the magnetic field strength at the air gap 15.

[0058] Furthermore, in order to provide linear guidance for the movement of the armature and ensure the stability and accuracy of the armature's trajectory, a sliding groove is provided at the center of the armature seat 22, and the armature 21 is disposed in the sliding groove of the armature seat 22, with the armature 21 slidingly engaged with the sliding groove of the armature seat 22.

[0059] Furthermore, the main permanent magnet 11 of the present invention is a high coercivity permanent magnet, and the main permanent magnet 11 is a neodymium iron boron permanent magnet or a samarium iron nitrogen permanent magnet. The auxiliary permanent magnet 12 is a magnetic temperature compensation alloy, and the auxiliary permanent magnet 12 is an AlNiCo permanent magnet or a samarium cobalt permanent magnet.

[0060] The main permanent magnet 11 of the present invention can provide most of the air gap magnetic field at room temperature, but its magnetic performance will decay at high temperature. The auxiliary permanent magnet 12 can also provide a part of the magnetic flux. Its characteristic is that its magnetic performance decay is very small at high temperature. Therefore, the main permanent magnet and the auxiliary permanent magnet of the present invention can work together to ensure that the present invention can provide a stable magnetic flux circuit in different temperature situations.

[0061] Furthermore, such as Figure 1 As shown, in order to make the structure more reasonable and to facilitate assembly, the coil unit 3 also includes a coil frame 32, the coil 31 is wound on the coil frame 32, and the coil frame 32 is fitted on the magnetic yoke 13.

[0062] Furthermore, such as Figure 1 As shown, in order to monitor the current temperature of the main permanent magnet in real time and dynamically adjust the current connected to the coil based on the temperature of the main permanent magnet, a temperature sensor 16 for monitoring the temperature is also provided on the main permanent magnet 11. The temperature sensor 16 is electrically connected to the adaptive pulse control system 4.

[0063] Furthermore, the formula for calculating the tripping current output by the adaptive pulse control system 4 is as follows:

[0064]

[0065] Where L is the inductance of the coil, T is the temperature compensation coefficient of the coil, and k is the proportional coefficient.

[0066] Furthermore, the formula for calculating the proportionality coefficient k is as follows:

[0067] k = k m ·k μ ·k f ·k s

[0068] Where, k m k is the magnetic circuit efficiency coefficient. μ k is the characteristic coefficient of the magnetic material. fk is the dynamic force coefficient. s This represents the system safety margin coefficient.

[0069] Furthermore, k is essentially a comprehensive proportionality coefficient, and the magnetic circuit efficiency coefficient k m Representing the integrity and efficiency of the magnetic circuit, it quantifies the loss of magnetomotive force from the coil to the air gap in the magnetic circuit, and the characteristic coefficient k of the magnetic permeable material. μ This reflects the characteristics of the magnetic properties of the yoke and core, which are magnetically conductive materials, as they change with temperature and nonlinearity. The dynamic force coefficient k... f This represents the "excess force" required for the tripping mechanism. For reliable tripping, the magnetic force generated by the coil must not only counteract the permanent magnet attraction but also provide an additional force to overcome inertia, friction, and ensure acceleration.

[0070] Furthermore, the tripping current output by the adaptive pulse control system 4 is a gradient pulse current, which is divided into two segments: a high-amplitude pulse in the first segment and a low-amplitude pulse in the second segment. This is used to achieve precise control of the armature's movement trajectory and avoid bouncing. The magnetic flux induced by the high-amplitude pulse in the coil is completely canceled out by the sum of the magnetic fluxes of the main permanent magnet and the auxiliary permanent magnet. The ratio of the high-amplitude pulse to the low-amplitude pulse is 3:1 to 5:1, and the duration ratio is 1:3 to 1:5.

[0071] Furthermore, such as Figure 2 As shown, the adaptive pulse control system 4 includes an intelligent monitoring module 41 and a current regulation module 42 that form a closed-loop control of the coil 31 and are electrically connected. The temperature sensor 16 and one end of the coil 31 are respectively electrically connected to the corresponding connection terminals of the intelligent monitoring module 41. The intelligent monitoring module 41 is used to monitor the working temperature of the permanent magnet and the current in the coil. The other end of the coil 31 is electrically connected to the current regulation module 42, and the current regulation module 42 is used to output a dynamically adjusted current to the coil 31.

[0072] The intelligent monitoring module 41 and the current regulation module 42 described in this invention are used to regulate and control the current in the coil by monitoring the current magnitude and the temperature of the permanent magnet in real time. The two modules only require a small amount of power to maintain a standby state. They do not output current when tripping is not required, and output current to the coil 31 when tripping is required to achieve the tripping action.

[0073] Furthermore, such as Figure 1 As shown, in order to improve the overall structural integration of the present invention, a base plate 5 is also included, and the anti-demagnetizing dual magnet unit 1, armature unit 2, coil unit 3 and adaptive pulse control system 4 are all disposed on the base plate 5.

[0074] The principle of the anti-demagnetizing bistable fast trip device of the present invention is based on permanent magnet drive, which uses permanent magnets to provide a constant magnetic field. The main permanent magnet provides a stable magnetic field to ensure the holding force of the trip device at room temperature; the auxiliary permanent magnet is used to compensate for the magnetic field of the main permanent magnet to decay due to the increase in temperature.

[0075] The principle of the locking mechanism in this invention is as follows: relying on the attraction force generated by the air gap magnetic field, the armature is firmly attracted to the iron core, thereby achieving the "closed holding" state. This is a pure "magnetic lock", with no mechanical friction, extremely high reliability, and no need to use the magnetic field generated by the coil being energized. Maintaining the closed state does not require any electrical energy, achieving zero power consumption holding.

[0076] Upon tripping: The current flowing through the control coil generates a magnetic flux that counteracts the magnetic flux generated by the permanent magnet. The magnetic attraction at the air gap instantly disappears or reverses, and the armature is rapidly released under the action of the tripping spring, completing the tripping process. The change in the air gap magnetic field from "present" to "absent" directly acts as a switch to trigger the mechanism.

[0077] The "bistable" nature of this invention is reflected in the following two aspects:

[0078] 1. The permanent magnet achieves self-holding of the latching state with zero power consumption, realizing a "magnetic latch" instead of a mechanical latch;

[0079] 2. Control the pulse current to ensure that the speed and trajectory of the armature during the tripping process are within a controllable range.

[0080] Specifically, this manifests as follows: tripping can be triggered with only a short pulse current, resulting in extremely low energy consumption (typically about 10%-20% of that of electromagnetic drives); low heat generation, making it suitable for high-frequency operation or long-term standby scenarios; the magnetic field is provided by a permanent magnet, resulting in faster response speed (microsecond level); no continuous current requirement, strong resistance to power supply interference, and higher reliability; the auxiliary permanent magnet can counteract the effect of high temperature on the magnetic flux of the main permanent magnet; and precise control of armature movement to avoid bouncing.

[0081] In summary, the anti-demagnetizing bistable fast trip unit of this invention is suitable for high reliability and high frequency operation scenarios (such as industrial circuit breakers and smart grids), as well as systems with high requirements for energy saving, fast response and anti-interference.

[0082] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A demagnetizing bistable fast trip unit for a spring-loaded mechanism, characterized in that: It includes an anti-demagnetizing dual magnet unit (1), an armature unit (2), a coil unit (3), and an adaptive pulse control system (4). The anti-demagnetization dual magnet unit (1) includes a main permanent magnet (11), an auxiliary permanent magnet (12), a magnetically conductive yoke (13), and an iron core (14). The main permanent magnet (11) and the auxiliary permanent magnet (12) are both assembled and connected to the magnetically conductive yoke (13), and the main permanent magnet (11) and the auxiliary permanent magnet (12) are symmetrically arranged along the magnetically conductive yoke (13). The magnetically conductive yoke (13) is provided with an air gap (15), and two iron cores (14) are arranged opposite to each other on the magnetically conductive yoke (13) and located at the air gap (15). A complete magnetic flux circuit is constructed by the main permanent magnet (11), the auxiliary permanent magnet (12), the magnetically conductive yoke (13), the iron core (14), and the air gap (15). The armature unit (2) includes an armature (21) and an armature seat (22). The armature (21) and the armature seat (22) are slidably engaged, and the head of the armature (21) is located in the air gap (15) of the magnetic yoke (13). The air gap magnetic field generated at the air gap (15) is used to attract the armature (21) or to cause the armature (21) to perform a tripping action. The coil unit (3) includes a coil (31) which is mounted on a magnetic yoke (13) and located between the main permanent magnet (11) and the auxiliary permanent magnet (12). The coil (31) is electrically connected to an adaptive pulse control system (4), which is used to output a tripping current and to dynamically adjust the current flowing into the coil (31). When there is no current in the coil (31), only the magnetic flux generated by the main permanent magnet (11) and the auxiliary permanent magnet (12) in the magnetic flux circuit forms a parallel relationship to supply magnetism to the air gap (15). At this time, the magnetic flux is superimposed to form an air gap magnetic field at the air gap (15), causing the armature (21) to be attracted to the air gap (15). When the tripping action is performed, the adaptive pulse control system (4) supplies tripping current to the coil (31). At this time, the magnetomotive force generated by the coil (31) and the magnetomotive force of the main permanent magnet (11) form a series relationship and form a superimposed magnetic flux in opposite directions. That is, the coil (31) generates a magnetic flux in the opposite direction to the main permanent magnet (11) and the auxiliary permanent magnet (12), and the magnitude of the magnetic flux is the same as the original magnetic flux in the magnetic flux circuit. The two cancel each other out, causing the air gap magnetic field at the air gap (15) to disappear and lose the attraction force on the armature (21). The armature (21) slides relative to the armature seat (22) and away from the air gap (15), completing the tripping action. When the tripping action is completed and reset, the adaptive pulse control system (4) supplies the current in the opposite direction to that during the tripping action to the coil (31) again. At this time, the direction of the magnet generated by the coil (31) in the magnetic flux circuit is the same as the magnetic flux direction of the main permanent magnet (11) and the auxiliary permanent magnet (12), which strengthens the air gap magnetic field at the air gap (15) and causes the armature (21) to be attracted to the air gap (15) again.

2. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: The magnetic yoke (13) includes a left yoke (131), a right yoke (132), and a lower yoke (133). The left yoke (131) and the right yoke (132) are arranged on both sides of the lower yoke (133). The coil (31) is located on the lower yoke (133). The main permanent magnet (11) is located between one end of the left yoke (131) and the lower yoke (133). The auxiliary permanent magnet (12) is located between the other end of the right yoke (132) and the lower yoke (133). The free ends of the left yoke (131) and the right yoke (132) are arranged opposite each other with a gap, and this gap forms an air gap (15). At the same time, the free end face of the left yoke (131) and the right yoke (132) is provided with an iron core (14).

3. The anti-demagnetizing bistable fast trip unit for the spring-operated mechanism according to claim 2, characterized in that: The left yoke (131) and the right yoke (132) are both L-shaped yokes, and the lower yoke (133) is a U-shaped yoke.

4. The anti-demagnetizing bistable fast trip unit for the spring-operated mechanism according to claim 2, characterized in that: The iron core (14) is combined with the inner surfaces of the left magnetic yoke (131) and the right magnetic yoke (132), and the cross-sectional area of ​​the outer surfaces of the left magnetic yoke (131) and the right magnetic yoke (132) is smaller than the cross-sectional area of ​​the inner surfaces, in order to strengthen the magnetic field strength at the air gap (15).

5. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: The armature seat (22) is provided with a sliding groove at its center, and the armature (21) is provided in the sliding groove of the armature seat (22), and the armature (21) slides in conjunction with the sliding groove of the armature seat (22).

6. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: The main permanent magnet (11) is a high coercivity permanent magnet, and the main permanent magnet (11) is a neodymium iron boron permanent magnet or a samarium iron nitrogen permanent magnet. The auxiliary permanent magnet (12) is a magnetic temperature compensation alloy, and the auxiliary permanent magnet (12) is an aluminum nickel cobalt permanent magnet or a samarium cobalt permanent magnet.

7. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: The coil unit (3) also includes a coil frame (32), the coil (31) is wound on the coil frame (32), and the coil frame (32) is fitted on the magnetic yoke (13).

8. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: The main permanent magnet (11) is also provided with a temperature sensor (16) for monitoring temperature, and the temperature sensor (16) is electrically connected to the adaptive pulse control system (4).

9. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: The formula for calculating the tripping current output by the adaptive pulse control system (4) is as follows: Where L is the inductance of the coil, T is the temperature compensation coefficient of the coil, and k is the proportional coefficient.

10. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 9, characterized in that: The formula for calculating the proportionality coefficient k is: k=k m ·k μ ·k f ·k s Where, k m k is the magnetic circuit efficiency coefficient. μ k is the characteristic coefficient of the magnetic material. f k is the dynamic force coefficient. s This represents the system safety margin coefficient.

11. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: The tripping current output by the adaptive pulse control system (4) is a gradient pulse current, and the gradient pulse current is divided into two segments. The first segment is a high-amplitude pulse, and the second segment is a low-amplitude pulse, which is used to achieve precise control of the armature movement trajectory and avoid bouncing. The magnetic flux induced by the high-amplitude pulse in the coil is completely canceled out by the sum of the magnetic flux of the main permanent magnet and the auxiliary permanent magnet. The ratio of the high-amplitude pulse to the low-amplitude pulse is 3:1 to 5:1, and the duration ratio is 1:3 to 1:

5.

12. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: The adaptive pulse control system (4) includes an intelligent monitoring module (41) and a current regulation module (42) that form a closed-loop control of the coil (31) and are electrically connected. One end of the coil (31) is electrically connected to the corresponding connection end of the intelligent monitoring module (41), and the intelligent monitoring module (41) is used to monitor the current in the coil. The other end of the coil (31) is electrically connected to the current regulation module (42), and the current regulation module (42) is used to output a dynamically regulated current to the coil (31).

13. The anti-demagnetizing bistable fast release device for the spring-operated mechanism according to claim 1, characterized in that: It also includes a base plate (5), on which the anti-demagnetizing dual magnet unit (1), armature unit (2), coil unit (3) and adaptive pulse control system (4) are all located.

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