magnetic holding contactor

Abstract

This utility model relates to the field of electronic device technology, specifically disclosing a magnetically latching contactor. The contactor includes a working mechanism and a driving mechanism; the working mechanism includes a moving iron core; the driving mechanism includes a magnetically conductive housing, which forms a sealed cavity. Inside the sealed cavity are a sleeve, a magnetic plate, and two coil groups. The moving iron core is located inside the sleeve and can move vertically relative to the sleeve. The sleeve passes through one coil group, the magnetic plate, and another coil group sequentially from top to bottom. One coil group drives the moving iron core upwards, and the other coil group drives it downwards. The magnetic plate is located in a horizontal plane and includes a magnetically conductive ring and four permanent magnets. The sleeve passes through the magnetically conductive ring, and all the permanent magnets are circumferentially distributed around the ring. One pole of each permanent magnet is connected to the outer wall of the magnetically conductive ring, and the other pole is in contact with the inner wall of the magnetically conductive housing. This contactor, through improved structural design, achieves full utilization of the magnetic field and optimized spatial layout.

Description

Technical Field

[0001] This utility model relates to the field of electronic device technology, and in particular to magnetic holding contactors. Background Technology

[0002] High-voltage contactors are critical switching devices in high-voltage power circuits, and their reliability directly affects the operational safety of the entire system. Currently, most mainstream high-voltage contactors on the market employ electromagnetic drive. These contactors rely on an energized electromagnetic coil to generate a magnetic field, driving the moving iron core to actuate, thereby closing or opening the contacts. Once the action is complete, a sustaining current must be continuously supplied to the coil to maintain the current state; otherwise, the contactor will return to its initial state. While this traditional drive method is simple in structure and technologically mature, it has significant drawbacks: firstly, prolonged coil energization leads to considerable energy loss, especially in applications requiring continuous closure, which contradicts current energy conservation and environmental protection trends; secondly, when the system experiences voltage dips, power fluctuations, or faults in the low-voltage auxiliary circuit, the coil power supply may be interrupted, causing the contactor to release unexpectedly, potentially leading to system power outages or even safety accidents, and lacking fail-safe capability.

[0003] To address these issues, the industry has gradually proposed and implemented several improvement solutions in recent years, such as using mechanical locking mechanisms or magnetic holding structures to achieve position holding in the absence of power. While mechanical locking can reduce energy consumption during the holding phase, its structure is often complex, reliability is limited, and it suffers from high operating noise, short mechanical life, and poor adaptability to applications with frequent switching. Magnetic holding contactors, on the other hand, utilize the magnetic field generated by permanent magnets to maintain the state instead of electrical energy. They achieve self-holding after the coil pulse excitation is completed, significantly reducing operating energy consumption and improving resistance to voltage fluctuations.

[0004] However, existing magnetic latching contactors still have many shortcomings in terms of magnetic circuit design and structural packaging. For example, permanent magnets are usually arranged around the coil or on one side, resulting in poor magnetic circuit closure, severe magnetic leakage, and low magnetic field utilization. To improve the holding force, larger permanent magnet materials or those with higher magnetic energy products are often required, leading to increased costs and larger structural dimensions. Meanwhile, the motion guiding structure design of the moving iron core directly affects the contactor's mechanical life and operational reliability. Conventional guiding methods are susceptible to external interference or uneven wear, affecting the contactor's long-term stability. Furthermore, high-voltage applications often involve complex environments, with contactors frequently exposed to high humidity, dust, or corrosive gases. Traditional open electromagnetic drive mechanisms are prone to contamination or oxidation, affecting coil insulation and the flexibility of the moving iron core's movement, thus reducing the overall product's environmental adaptability and service life. Utility Model Content

[0005] The purpose of this invention is to provide a magnetic holding contactor that fully utilizes the magnetic field and optimizes the spatial layout.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A magnetically latching contactor includes a working mechanism and a driving mechanism. The working mechanism includes a moving iron core. The driving mechanism includes a magnetically conductive housing that forms a sealed cavity. The sealed cavity contains a sleeve, a magnetic plate, and two coil groups. The moving iron core is located inside the sleeve and can move up and down relative to the sleeve. The sleeve passes through one coil group, the magnetic plate, and another coil group sequentially from top to bottom. One coil group can drive the moving iron core to move upward, and the other coil group can drive the moving iron core to move downward. The magnetic plate is located in a horizontal plane and includes a magnetically conductive ring and four permanent magnets. The sleeve passes through the magnetically conductive ring. All the permanent magnets are circumferentially distributed on the magnetically conductive ring. One pole of each permanent magnet is connected to the outer wall of the magnetically conductive ring, and the other pole is in contact with the inner wall of the magnetically conductive housing.

[0008] As an optional technical solution for the magnetic holding contactor, the magnetic housing includes a magnetic pole piece and a magnetic cylinder. The opening of the magnetic cylinder faces upward, and the magnetic pole piece is disposed inside the magnetic cylinder. The magnetic pole piece and the inner wall of the magnetic cylinder form the sealed cavity. A pole shoe is connected to the magnetic pole piece and is located inside the sealed cavity.

[0009] As an optional technical solution for the magnetic holding contactor, the moving iron core moves between the upper limit position and the lower limit position. When the moving iron core is at the upper limit position, the top surface of the moving iron core is in contact with the surface of the pole shoe. When the moving iron core is at the lower limit position, the bottom surface of the moving iron core is in contact with the bottom of the magnetic cylinder.

[0010] As an optional technical solution for the magnetic holding contactor, the working mechanism further includes a push rod assembly and a contact assembly, with the moving iron core fixedly connected to the push rod assembly. When the moving iron core is at the upper limit position, the push rod assembly contacts and is electrically connected to the contact assembly, causing the magnetic holding contactor to be in an engaged state. When the moving iron core is at the lower limit position, the push rod assembly and the contact assembly are spaced apart, causing the magnetic holding contactor to be in an open state.

[0011] As an optional technical solution for the magnetic latching contactor, the working mechanism further includes a shielding housing, which forms a shielding cavity. The push rod assembly is disposed within the shielding cavity, with a portion of the push rod assembly extending out of the shielding cavity and connected to the moving iron core. The contact assembly is connected to the top of the shielding housing, and at least a portion of the bottom of the shielding housing is inserted into the magnetic cylinder.

[0012] As an optional technical solution for the magnetically latching contactor, the pole shoe is inserted into the top end of the sleeve, and the top end of the sleeve is spaced apart from the magnetic cylinder.

[0013] As an optional technical solution for magnetically latching contactors, the bottom surface of the moving iron core is recessed with several notches, and all the notches are evenly distributed circumferentially.

[0014] As an optional technical solution for magnetically latching contactors, the moving iron core is provided with several air passage holes that extend along its own length.

[0015] As an optional technical solution for the magnetic holding contactor, one of the two coil groups is provided with a male positioning protrusion and the other with a female positioning protrusion. The number of male positioning protrusions and the number of female positioning protrusions are the same as the number of permanent magnets. The sidewall of the male positioning protrusion abuts against the sidewall of two adjacent permanent magnets, and each male positioning protrusion is matched and plugged into one female positioning protrusion.

[0016] As an optional technical solution for the magnetically latching contactor, the sidewall of the moving iron core matches and fits against the inner wall of the sleeve, and the moving iron core and the sleeve slide together along the extension direction of the sleeve.

[0017] The beneficial effects of this utility model are:

[0018] This magnetically latching contactor arranges two coil groups on the upper and lower sides of a magnetic plate, respectively driving the moving iron core upward and downward. Combined with the magnetic field holding force provided by a permanent magnet, a stable dual-pole path is formed within the sleeve, allowing the moving iron core to be precisely positioned under magnetic force. Furthermore, by cooperating with the magnetic plate and the magnetically conductive housing, a closed double magnetic circuit is constructed, thereby reducing magnetic leakage, achieving efficient magnetic circuit closure, and improving magnetic field utilization. The entire drive mechanism is sealed within the magnetically conductive housing, effectively preventing corrosion from external factors such as dust and moisture, significantly improving the product's environmental adaptability, long-term reliability, and mechanical lifespan. The magnetic plate employs a design with four permanent magnets evenly distributed circumferentially on the magnetic ring. The magnetic ring effectively converges and evenly distributes the magnetic field generated by the four circumferential permanent magnets, forming a closed magnetic circuit through the moving iron core with the magnetic shell. This ingenious structure creates a radially uniform magnetic field, preventing magnetic dissipation. As a key magnetic flux transfer and distribution component, the magnetic ring guides the magnetic lines of force of the permanent magnets to the moving iron core more concentratedly and evenly, significantly enhancing the effective magnetic field strength acting on the moving iron core and greatly increasing the magnetic flux through it. This allows the two coil groups to provide sufficient holding force with minimal energy consumption, a smaller magnet volume, or a lower magnetic energy product when energized, ensuring the contactor reliably maintains its current state even when de-energized. It efficiently drives the moving iron core upward or downward, achieving reliable bistable switching and significant energy savings. This reduces hysteresis loss, improves operational sensitivity and energy efficiency, optimizes the magnetic circuit design, and enhances magnetic energy utilization. The bushing passes through the coil group, magnetic plate and another coil group in sequence, and the moving iron core is built into the bushing. The bushing provides precise guidance for the moving iron core, ensuring the linearity and smoothness of its operation. It makes maximum use of radial space, making the axial structure of the drive mechanism compact, which is conducive to the miniaturization design of the contactor as a whole and has a high space utilization rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the magnetic holding contactor provided in this embodiment of the utility model;

[0020] Figure 2 This is a cross-sectional view of the magnetic holding contactor provided in an embodiment of this utility model;

[0021] Figure 3 This is an exploded view of the magnetic holding contactor provided in this embodiment of the utility model;

[0022] Figure 4 This is an exploded cross-sectional view of the magnetic holding contactor provided in this embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the moving iron core provided in an embodiment of the present invention.

[0024] In the picture:

[0025] 100. Drive mechanism; 110. Magnetic pole piece; 111. Pole shoe; 120. Sleeve; 130. Magnetic cylinder; 140. First coil group; 150. Magnetic guide ring; 160. Permanent magnet; 170. Second coil group; 171. Male positioning protrusion;

[0026] 200. Working mechanism; 210. Contact group; 220. Upper shielding shell; 230. Push rod group; 240. Lower shielding shell; 250. Moving iron core; 251. Mounting through hole; 252. Notch; 253. Air passage hole. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] like Figures 1 to 5 As shown, this embodiment provides a magnetic holding contactor, including a working mechanism 200 and a driving mechanism 100. The working mechanism 200 includes a moving iron core 250. The driving mechanism 100 includes a magnetic housing, which forms a sealed cavity. The sealed cavity contains a sleeve 120, a magnetic plate, and two coil groups. The moving iron core 250 is located inside the sleeve 120 and can move up and down relative to the sleeve 120. The sleeve 120 is sequentially connected to one coil group, the magnetic plate, and another coil group from top to bottom. One coil group can drive the moving iron core 250 to move upward, and the other coil group can drive the moving iron core 250 to move downward. The magnetic plate is located in a horizontal plane and includes a magnetic ring 150 and four permanent magnets 160. The sleeve 120 is connected to the magnetic ring 150. All the permanent magnets 160 are circumferentially distributed on the magnetic ring 150. One magnetic pole of the permanent magnet 160 is connected to the outer wall of the magnetic ring 150, and the other magnetic pole is in contact with the inner wall of the magnetic housing.

[0032] This magnetically latching contactor arranges two coil groups on the upper and lower sides of a magnetic plate, respectively driving the moving iron core 250 to move upward and downward. Combined with the magnetic field holding force provided by the permanent magnet 160, a stable dual-pole path is formed within the sleeve 120, allowing the moving iron core 250 to be precisely positioned under magnetic force. Furthermore, by cooperating with the magnetic plate and the magnetically conductive housing, a closed dual magnetically conductive circuit is constructed, thereby reducing magnetic leakage, achieving efficient magnetic circuit closure, and improving magnetic field utilization. The entire drive mechanism 100 is sealed within the magnetically conductive housing, effectively preventing corrosion from external factors such as dust and moisture, significantly improving the product's environmental adaptability, long-term reliability, and mechanical lifespan. The magnetic plate adopts a design with four permanent magnets 160 evenly distributed circumferentially on the magnetic ring 150. The magnetic ring 150 effectively converges and evenly distributes the magnetic field generated by the four circumferential permanent magnets 160, forming a closed magnetic circuit through the moving iron core 250 with the magnetic shell. This structure ingeniously forms a radial uniform magnetic field, avoiding magnetic circuit dissipation. As a key magnetic flux transfer and distribution component, the magnetic ring 150 can guide the magnetic lines of force of the permanent magnets 160 to the moving iron core 250 more concentratedly and evenly, significantly enhancing the effective magnetic field strength acting on the moving iron core 250 and greatly increasing the magnetic flux through the moving iron core 250. This allows the two coil groups to provide sufficient holding force with minimal energy consumption, smaller magnet volume, or lower magnetic energy product when energized, ensuring that the contactor can reliably maintain its current state even when de-energized, efficiently driving the moving iron core 250 to move up or down, achieving reliable bistable switching, and achieving significant energy-saving effects. This reduces hysteresis loss, improves the sensitivity and energy efficiency of the action, optimizes the magnetic circuit design, and enhances the utilization rate of magnetic energy. The sleeve 120 passes through the coil group, magnetic plate, and another coil group in sequence, housing the moving iron core 250 inside the sleeve 120. The sleeve 120 provides precise guidance for the moving iron core 250, ensuring the linearity and smoothness of its action. It maximizes the utilization of radial space, making the axial structure of the drive mechanism 100 compact, which is conducive to the miniaturization design of the contactor as a whole and has a high space utilization rate.

[0033] In this embodiment, the two coil groups are defined as the first coil group 140 and the second coil group 170, respectively. The first coil group 140 is located above the magnetic plate and is used to drive the moving iron core 250 to move upward; the second coil group 170 is located below the magnetic plate and is used to drive the moving iron core 250 to move downward.

[0034] In one embodiment of this invention, the polarity of the permanent magnet 160 near the magnetic ring 150 is the S pole, and the polarity of the permanent magnet 160 away from the magnetic ring 150 is the N pole. In another embodiment of this invention, the polarity of the permanent magnet 160 is reversed. The thickness and width of the permanent magnet 160 depend on its remanent magnetization and the required holding force, and their values ​​are not fixed. Excessive remanence of the permanent magnet 160 will generate unnecessary excess holding force, and will prevent the moving iron core 250 from moving during state transitions. Therefore, the strength of the permanent magnet 160 is mainly used to provide the holding force to maintain the current state. Simultaneously, the magnetic cross-sectional area between the magnetic ring 150 and the moving iron core 250 must not be less than the minimum cross-sectional area of ​​the moving iron core 250; otherwise, magnetic conductivity will be affected.

[0035] The distribution of the magnetic field in the magnetic plate is common knowledge in the field, and its specific principle is well known to those skilled in the art. It is not the focus of this embodiment and will not be elaborated here.

[0036] In this embodiment, the magnetic housing includes a magnetic pole piece 110 and a magnetic cylinder 130. The opening of the magnetic cylinder 130 faces upward. The magnetic pole piece 110 is disposed inside the magnetic cylinder 130. The magnetic pole piece 110 and the inner wall of the magnetic cylinder 130 form a sealed cavity. A pole shoe 111 is connected to the magnetic pole piece 110 and is located inside the sealed cavity.

[0037] The combination of magnetic pole piece 110 and magnetic cylinder 130 has a simple structure, making it easy to manufacture and assemble. The combination of magnetic pole piece 110 and magnetic cylinder 130 forms a complete magnetic shielding cavity, which on the one hand confines the magnetic field so that it mainly acts on the internal magnetic circuit, reducing external magnetic leakage; on the other hand, it makes the overall structure more compact and robust. The setting of the pole shoe 111 extends the magnetic pole area, allowing it to be closer to the moving iron core 250, effectively reducing the magnetic resistance of the working air gap. The inner wall of the magnetic cylinder 130 is in direct contact with the permanent magnet 160, ensuring smooth transmission of magnetic lines of force from the magnetic ring 150, permanent magnet 160, magnetic cylinder 130, magnetic pole piece 110 to the pole shoe 111 on the magnetic pole piece 110. This allows the magnetic pole piece 110 and magnetic cylinder 130 to together form a complete, low-resistance magnetic circuit channel, ensuring that the magnetic field generated by the permanent magnet 160 and the coil can be effectively guided and utilized, providing a clear magnetic path. The pole shoe 111 on the magnetic pole piece 110 extends into the sealed cavity, which can effectively concentrate and guide the magnetic lines of force, increase the magnetic flux density in the contact area with the top of the moving iron core 250, reduce magnetic resistance, optimize the magnetic circuit path, and ensure that when the moving iron core 250 moves upward to the limit position, it can form a low magnetic resistance circuit with the pole shoe 111. This significantly increases the attraction and holding force of the moving iron core 250, improves the action sensitivity, and reduces the power consumption requirements of the drive coil, further optimizing the magnetic circuit and ensuring that the contactor can still maintain a stable position when subjected to vibration or impact, thereby enhancing the local magnetic field strength.

[0038] Furthermore, the moving iron core 250 moves between the upper limit position and the lower limit position. When the moving iron core 250 is in the upper limit position, the top surface of the moving iron core 250 is in contact with the surface of the pole shoe 111. When the moving iron core 250 is in the lower limit position, the bottom surface of the moving iron core 250 is in contact with the bottom of the magnetic cylinder 130.

[0039] The aforementioned structure clearly defines the two stable mechanical stops of the moving iron core 250: the "upper limit position" and the "lower limit position," corresponding to the contactor's engaging and disengaging states, respectively. This clearly limits the physical travel of the moving iron core 250, ensuring precise and controllable operating range. The defined working stroke and reliable limit guarantee the determinism and reliability of the contactor's operation, defining a stable bistable position. At the upper limit position, the moving iron core 250 is in contact with the pole shoe 111, forming a closed magnetic circuit with minimal magnetic resistance and zero energy consumption. At the lower limit position, the moving iron core 250 is in contact with the bottom of the magnetic cylinder 130, similarly forming a low magnetic resistance circuit. This ensures the stability of the moving iron core 250 in the disengaged state, prevents malfunctions due to vibration or impact, optimizes magnetic circuit closure, and effectively eliminates residual magnetic force, preparing for the next reliable operation. Low magnetic resistance is maintained, and reliable reset is achieved. Both states minimize or even eliminate the air gap in the magnetic circuit, allowing the magnetic holding force of the permanent magnet 160 to reach its maximum value during state maintenance, ensuring extreme stability.

[0040] Furthermore, the working mechanism 200 also includes a push rod assembly 230 and a contact assembly 210, with the moving iron core 250 fixedly connected to the push rod assembly 230. When the moving iron core 250 is at its upper limit position, the push rod assembly 230 contacts and is electrically connected to the contact assembly 210, causing the magnetic holding contactor to be in the engaged state. When the moving iron core 250 is at its lower limit position, the push rod assembly 230 and the contact assembly 210 are spaced apart, causing the magnetic holding contactor to be in the disengaged state.

[0041] The linear motion of the moving iron core 250 is directly transmitted to the contact group 210 via the push rod assembly 230, achieving precise and reliable linkage between electromagnetic drive and circuit switching. This accurately converts the mechanical action of the electromagnetic drive into the on / off state of the circuit. The specific structure is directly stable, with high transmission efficiency and fast response speed, achieving direct and reliable electrical on / off control. The position of the moving iron core 250 directly determines the contact and separation of the contacts. It is clearly defined that the mechanical motion of the moving iron core 250 is precisely transmitted to the contact group 210 via the push rod assembly 230, accurately converting the mechanical action of the electromagnetic drive into the on / off state of the circuit. This fundamentally ensures that the on / off state of the contactor is completely synchronized with the state of the mechanical drive components; that is, "when the moving iron core 250 is at its upper limit position, the magnetically held contactor is in the engaged state" and "when the moving iron core 250 is at its lower limit position, the magnetically held contactor is in the disengaged state." The function is reliable and the logic is clear. In the disconnected state, the push rod assembly 230 and the contact assembly 210 are spaced apart, providing sufficient electrical clearance and creepage distance, ensuring good insulation performance and high safety, and ensuring electrical isolation and safety.

[0042] Furthermore, the working mechanism 200 also includes a shielding housing, which forms a shielding cavity. A push rod assembly 230 is disposed within the shielding cavity, with a portion of the push rod assembly 230 extending out of the shielding cavity and connected to the moving iron core 250. A contact assembly 210 is connected to the top of the shielding housing, and at least part of the bottom of the shielding housing is inserted into the magnetic cylinder 130. Specifically, the shielding housing includes a detachably connected upper shielding shell 220 and a lower shielding shell 240, which together form the shielding cavity.

[0043] The shielding housing seals the arc-generating push rod assembly 230 and contact assembly 210 within it, effectively limiting arc expansion, promoting arc extinguishing, and preventing metal debris and fumes generated by contact operation from contaminating the precision electromagnetic components inside the drive mechanism 100, greatly improving the product's electrical safety and reliability. Simultaneously, the metal shielding housing also provides electromagnetic shielding, reducing interference from the internal arc magnetic field to external circuits and protecting the drive mechanism 100 from external electromagnetic interference. The insertion fit between the shielding housing and the magnetic cylinder 130 allows for modular assembly of the drive mechanism 100 and the working mechanism 200, enhancing the structural connection strength and overall integrity between the working mechanism 200 and the drive mechanism 100, and contributing to better sealing protection, further protecting the internal moving parts such as the push rod.

[0044] In this embodiment, the pole shoe 111 is inserted into the top end of the sleeve 120, and the top end of the sleeve 120 is spaced apart from the magnetic cylinder 130.

[0045] The structure of the pole shoe 111 inserting into the top of the sleeve 120 serves to position and center the sleeve 120, thereby ensuring the coaxiality of the moving iron core 250's movement trajectory with the center of the pole shoe 111, reducing wear, making the movement smoother, and avoiding jamming or uneven attraction caused by eccentricity. It also ensures complete contact between the moving iron core 250 and the pole shoe 111, minimizing magnetic resistance. The spaced arrangement between the top of the sleeve 120 and the magnetic cylinder 130 prevents unnecessary short-circuiting in the magnetic circuit at this point, ensuring that the magnetic field can be effectively guided to the pole shoe 111 and act on the moving iron core 250, forming the necessary magnetic circuit gap, avoiding leakage and waste of magnetic lines of force, and ensuring that the magnetic field can effectively close the path through the pole shoe 111 and the moving iron core 250, improving the efficiency of the magnetic circuit and ensuring the magnetic field strength of the main magnetic circuit.

[0046] For example, the bottom surface of the moving iron core 250 is provided with a plurality of notches 252, and all the notches 252 are evenly distributed circumferentially.

[0047] When the moving iron core 250 needs to move upward from its lower limit position, these notches 252 reduce the effective contact area between the moving iron core 250 and the bottom of the magnetic cylinder 130, thereby significantly reducing the magnetic holding force between them. This makes it easier and faster for the moving iron core 250 to disengage from the engaged state, improving the response speed and reliability of the contactor's disconnection action. Furthermore, the tiny air gaps formed at the edges of the notches 252 quickly gather magnetic lines of force, allowing the upper coil to overcome this holding force with only a small magnetic force, smoothly starting the moving iron core 250. This effectively improves the starting characteristics of the moving iron core 250, enhances the reliability and sensitivity of the contactor's transition from the disconnected to the engaged state, reduces the separation magnetic force, and ensures reliable release.

[0048] In this embodiment, the moving iron core 250 is provided with a plurality of air passage holes 253 that extend along its own length.

[0049] When the moving iron core 250 moves at high speed within the sealed sleeve 120, the air at its ends is compressed or rarefied, creating a pressure difference between the two ends and forming an "air cushion" effect. This hinders movement and may cause sluggish action or vibration. The air passage 253 connects the upper and lower spaces of the moving iron core 250, providing a flow channel for air. This allows for rapid equalization of internal air pressure, greatly reducing air resistance during the movement of the moving iron core 250, significantly reducing motion damping, making the movement of the moving iron core 250 smoother and faster, improving the contactor's operating speed and service life, eliminating the air cushion effect, and improving dynamic response.

[0050] Specifically, the moving iron core 250 is provided with a mounting through hole 251, and the part of the push rod assembly 230 extending out of the shielding cavity is matched and inserted into the mounting through hole 251.

[0051] For example, one of the two coil groups is provided with a male positioning protrusion 171 and the other is provided with a female positioning protrusion. The number of male positioning protrusions 171 and the number of female positioning protrusions are the same as the number of permanent magnets 160. The sidewall of the male positioning protrusion 171 abuts against the sidewall of two adjacent permanent magnets 160. Each male positioning protrusion 171 is matched and plugged into a female positioning protrusion.

[0052] Through the interlocking of male and female positioning protrusions, the male positioning protrusion 171 presses against the side wall of the adjacent permanent magnet 160, ensuring that the upper and lower coil groups have a unique and correct circumferential position relative to the permanent magnet 160 during assembly. This fixed relative position prevents the permanent magnet 160 from shifting due to vibration or magnetic force during operation, avoiding coil misalignment that could affect electromagnetic efficiency, thus ensuring the stability and consistency of the magnetic circuit structure. The male and female positioning protrusion structure provides a clear assembly reference, making the assembly process faster and more accurate, improving assembly precision and reliability, reducing assembly errors, and increasing production efficiency and product consistency.

[0053] In this embodiment, the male positioning protrusion 171 is located at the top of the second coil group 170, and the female positioning protrusion is located at the top of the first coil group 140, as an example.

[0054] In this embodiment, the sidewall of the moving iron core 250 matches and fits the inner wall of the sleeve 120, and the moving iron core 250 and the sleeve 120 slide together along the extension direction of the sleeve 120.

[0055] The moving iron core 250 is matched and slidably fitted with the inner wall of the sleeve 120, providing precise guidance for the moving iron core 250 and preventing it from swaying, tilting or jamming during movement. This ensures the linearity and precision of the action, makes the contact points contact and separate accurately, and guarantees the guidance and stability of the movement.

[0056] The perfectly fitted sliding contact provides the moving iron core 250 with extremely high guiding accuracy, ensuring that it moves along a precise straight trajectory, preventing skew and jamming, reducing unnecessary shaking and impact, decreasing wear between the moving iron core 250 and the bushing 120, and extending service life. This ensures the accuracy and consistency of contact opening and closing. The tight fit minimizes and equalizes the working air gap between the moving iron core 250 and the bushing 120, reducing magnetic resistance in the magnetic circuit, reducing magnetic flux leakage, and improving the utilization rate of the magnetic field and the efficiency of the electromagnetic drive. This enhances the efficiency of the magnetic circuit, as well as the electromagnetic driving force and holding force.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A magnetic latching contactor, characterized in that, include: The working mechanism (200) includes a moving iron core (250); The driving mechanism (100) includes a magnetic housing that forms a sealed cavity. A sleeve (120), a magnetic plate, and two coil groups are disposed within the sealed cavity. A moving iron core (250) is located within the sleeve (120) and can move vertically relative to the sleeve (120). The sleeve (120) is sequentially connected from top to bottom to one coil group, the magnetic plate, and another coil group. One coil group can drive the moving iron core (250) to move upwards, and the other coil group... The coil assembly can drive the moving iron core (250) to move downward; the magnetic plate is located in a horizontal plane, the magnetic plate includes a magnetic ring (150) and four permanent magnets (160), the sleeve (120) passes through the magnetic ring (150), all the permanent magnets (160) are circumferentially distributed on the magnetic ring (150), one magnetic pole of the permanent magnet (160) is connected to the outer wall of the magnetic ring (150), and the other magnetic pole is in contact with the inner wall of the magnetic housing.

2. The magnetic latching contactor according to claim 1, characterized in that, The magnetic housing includes a magnetic pole piece (110) and a magnetic cylinder (130). The opening of the magnetic cylinder (130) faces upward. The magnetic pole piece (110) is disposed inside the magnetic cylinder (130). The magnetic pole piece (110) and the inner wall of the magnetic cylinder (130) form the sealed cavity. A pole shoe (111) is connected to the magnetic pole piece (110). The pole shoe (111) is located inside the sealed cavity.

3. The magnetic latching contactor according to claim 2, characterized in that, The moving iron core (250) moves between the upper limit position and the lower limit position. When the moving iron core (250) is in the upper limit position, the top surface of the moving iron core (250) is in contact with the surface of the pole shoe (111). When the moving iron core (250) is in the lower limit position, the bottom surface of the moving iron core (250) is in contact with the bottom of the magnetic cylinder (130).

4. The magnetic latching contactor according to claim 3, characterized in that, The working mechanism (200) further includes a push rod assembly (230) and a contact assembly (210), and the moving iron core (250) is fixedly connected to the push rod assembly (230). When the moving iron core (250) is located at the upper limit position, the push rod assembly (230) contacts and is electrically connected to the contact assembly (210), so that the magnetic holding contactor is in the attracted state. When the moving iron core (250) is located at the lower limit position, the push rod assembly (230) and the contact assembly (210) are spaced apart, so that the magnetic holding contactor is in the disconnected state.

5. The magnetic latching contactor according to claim 4, characterized in that, The working mechanism (200) also includes a shielding shell, which forms a shielding cavity. The push rod assembly (230) is located in the shielding cavity, and a portion of the push rod assembly (230) extends out of the shielding cavity and is connected to the moving iron core (250). The contact assembly (210) is connected to the top of the shielding shell, and at least part of the bottom of the shielding shell is inserted into the magnetic cylinder (130).

6. The magnetic latching contactor according to claim 2, characterized in that, The pole shoe (111) is inserted into the top end of the sleeve (120), and the top end of the sleeve (120) is spaced apart from the magnetic cylinder (130).

7. The magnetic latching contactor according to claim 3, characterized in that, The bottom surface of the moving iron core (250) is provided with a number of notches (252), and all the notches (252) are evenly distributed around the circumference.

8. The magnetic latching contactor according to claim 1, characterized in that, The moving iron core (250) is provided with several air passage holes (253) that run through it along its own length.

9. The magnetic latching contactor according to claim 1, characterized in that, One of the two coil groups is provided with a male positioning protrusion (171), and the other is provided with a female positioning protrusion. The number of male positioning protrusions (171) and the number of female positioning protrusions are the same as the number of permanent magnets (160). The sidewall of the male positioning protrusion (171) abuts against the sidewall of two adjacent permanent magnets (160). Each male positioning protrusion (171) is matched and inserted with one female positioning protrusion.

10. The magnetically latching contactor according to any one of claims 1-9, characterized in that, The sidewall of the moving iron core (250) matches and fits the inner wall of the sleeve (120), and the moving iron core (250) and the sleeve (120) slide together along the extension direction of the sleeve (120).

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