An arc extinguishing device

Abstract

This utility model discloses an arc-extinguishing device, relating to the field of electrical switch technology, applied to electromagnetic switch elements. The electromagnetic switch element includes a base plate, a base mounted on the base plate, and two sets of moving contacts and stationary contacts mounted on the base. The arc-extinguishing device is characterized by including a horizontal magnet positioned below the moving contacts at a first predetermined distance, and a vertical magnet positioned to the side of the moving contacts at a second predetermined distance. The horizontal and vertical magnets are arranged in an L-shape, with the vertical magnet positioned along the line connecting the two moving contacts. The projection of the moving contact onto the horizontal magnet overlaps with the horizontal magnet, and the projection of the moving contact onto the vertical magnet also overlaps with the vertical magnet. The horizontal and vertical magnets work together to cause the electric arc generated between the moving and stationary contacts to rotate. This upgrades the existing arc-extinguishing device to a rotating arc-extinguishing device without increasing the overall size of the electromagnetic switch element, while ensuring that the arc-extinguishing effect is not weakened.

Description

Technical Field

[0001] This utility model relates to the field of electrical switch technology, and in particular to an arc extinguishing device. Background Technology

[0002] Electromagnetic switching components such as relays and contactors typically consist of an electromagnetic system (coil, iron core), a contact system (moving contact, stationary contact), and an arc-extinguishing device. Their working principle involves generating a magnetic field by energizing the coil, which drives the contacts to move. This utilizes electromagnetic principles to control the on / off state of the circuit, thereby fulfilling the functions of circuit control and protection.

[0003] Arc-extinguishing devices in electromagnetic switching components can quickly extinguish the arc when the circuit is broken, preventing equipment damage and personal injury. However, existing arc-extinguishing devices mostly use arc-extinguishing materials to achieve this function. This method may affect adjacent parts in the direction of arc spatter, causing arc erosion that adversely affects material properties. Therefore, it is necessary to remove material from adjacent parts to reduce the impact of arc erosion and avoid arc spatter causing thermal damage, microstructural changes, or the formation of corrosion initiation points in non-welded areas, thereby ensuring the mechanical properties and corrosion resistance of the material.

[0004] With the development of new energy technologies, traditional lead-acid batteries are gradually being replaced by lithium batteries, and voltage levels are also increasing. This places higher demands on the arc-extinguishing performance of electromagnetic switching components such as traditional voltage-level relays and contactors. To address this, the arc-rotating extinguishing device has emerged. This device uses a magnetic field to rotate the arc, extending the arc path and enhancing cooling, thereby achieving rapid arc extinguishing. Arc-rotating extinguishing devices are commonly used in high-voltage or medium-voltage switchgear (such as circuit breakers and contactors) to improve breaking capacity and equipment reliability.

[0005] The core principle of an arc-extinguishing device is to utilize the Lorentz force generated by the electric current itself or an external magnetic field to cause the arc to rotate at high speed between the contacts. During the arc rotation, its path is lengthened, and the contact area between the arc column and the surrounding medium increases, thereby accelerating the cooling and deionization process of the arc and ultimately achieving rapid arc extinguishing. This device typically includes an arc-extinguishing coil, a contact system, an arc-extinguishing chamber, and a magnetic field guiding structure. The arc-extinguishing coil generates the magnetic field and is usually connected in series or parallel with the main circuit; the contact system includes moving and stationary contacts where the arc is generated; the arc-extinguishing chamber contains the arc and provides the arc-extinguishing medium (such as SF6 gas or vacuum); and the magnetic field guiding structure (such as a magnetically conductive steel plate or a spiral contact) enhances and guides the magnetic field distribution.

[0006] However, existing arc-extinguishing devices typically employ two magnets arranged in an L-shape, positioned on the two vertical sides of the moving contact, such as... Figure 1 and Figure 2As shown, this design aims to extinguish the electric arc through rotation. However, one magnet of this L-shaped magnet is located outside the moving contact, resulting in a large overall length of the arc-extinguishing device, making it difficult to directly apply to existing electromagnetic switch components. If forced to use it, the dimensions of existing electromagnetic switch components would need to be adjusted, for example, by increasing the length of the base plate and base. This not only increases the processing difficulty and cost but also leads to a larger electromagnetic switch component, affecting the user experience.

[0007] In summary, how to upgrade existing arc-extinguishing devices into rotating arc-extinguishing devices without increasing the external dimensions of electromagnetic switch components, while simultaneously enhancing the arc-extinguishing effect, has become a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0008] The purpose of this invention is to provide an arc extinguishing device that upgrades the existing arc extinguishing device into an electric arc rotation arc extinguishing device without increasing the external dimensions of the electromagnetic switch components, while enhancing the arc extinguishing effect.

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0010] An arc-extinguishing device is applied to an electromagnetic switching element. The electromagnetic switching element includes a base plate, a base mounted on the base plate, and two sets of moving contacts and stationary contacts mounted on the base. The arc-extinguishing device includes a horizontal magnet disposed below the moving contacts and spaced apart by a first predetermined distance, and a vertical magnet disposed on the side of the moving contacts and spaced apart by a second predetermined distance. The horizontal magnet and the vertical magnet are arranged in an L-shape. The vertical magnet is arranged along the line connecting the two moving contacts. The projection of the moving contact on the horizontal magnet overlaps with the horizontal magnet, and the projection of the moving contact on the vertical magnet also overlaps with the vertical magnet. The horizontal magnet and the vertical magnet work together to cause the electric arc generated between the moving contact and the stationary contact to rotate.

[0011] Optionally, the base is provided with a support groove for mounting the vertical magnet, and the support groove is provided with a partition for isolating the vertical magnet from the moving contact.

[0012] Optionally, it also includes a mounting block installed on the base plate, the top of the mounting block having a mounting groove, and the horizontal magnet being embedded in the mounting groove.

[0013] Optionally, the upper part of the mounting groove is provided with a buckle, and the depth of the mounting groove is greater than or equal to the thickness of the horizontal magnet; when the horizontal magnet is embedded in the mounting groove, the lower surface of the buckle abuts against the upper surface of the horizontal magnet to achieve the limiting and fixing of the horizontal magnet.

[0014] Optionally, the buckle is disposed on at least one pair of opposite sidewalls of the mounting groove, and the buckle is an undercut whose upper surface gradually thins from the root connected to the sidewall of the mounting groove towards the end.

[0015] Optionally, a vertical sliding groove is provided on the side wall of the mounting groove, and the connecting end of the buckle is slidably connected in the vertical sliding groove to realize the adjustable installation of the buckle in the vertical direction.

[0016] Optionally, the bottom height of the mounting groove is adjustable to adjust the distance between the horizontal magnet and the moving contact.

[0017] Optionally, a gap is provided between the top surface of the mounting block and the bottom surface of the moving contact, and a gap is provided between the inner wall of the mounting groove and the outer wall of the horizontal magnet.

[0018] Optionally, the sidewall of the mounting block mates with the inner wall of the base to achieve installation limitation of the mounting block in the width and length directions; the mounting block is provided with limiting ribs for mates with the base to achieve installation limitation in the height direction.

[0019] Optionally, the area of ​​the horizontal magnet covers the projected area of ​​the moving contact on the horizontal magnet, and the vertical centerline of the horizontal magnet coincides with the vertical centerline of the moving contact; the area of ​​the vertical magnet covers the projected area of ​​the moving contact on the vertical magnet, and the horizontal centerline of the vertical magnet coincides with the horizontal centerline of the moving contact.

[0020] The beneficial effects of this utility model are as follows: The arc-extinguishing device provided by this utility model includes a horizontal magnet and a vertical magnet, which are arranged in an L-shape and respectively located below and to the side of the moving contact. The horizontal magnet makes full use of the space below the moving contact without increasing the height of the component; the vertical magnet is arranged along the length of the moving contact without increasing the length of the component, and its thickness does not exceed the width of the component, thus not increasing the overall width. The projections of the moving contact onto the two magnets have overlapping areas, ensuring that the magnetic field effectively acts on the arc region.

[0021] Horizontal magnets generate a vertical magnetic field, and vertical magnets generate a horizontal magnetic field; the two superimpose to form a rotating magnetic field. When the moving contact separates from the stationary contact and generates an electric arc, the combined magnetic field subjects the arc to a Lorentz force, causing stable rotational motion. The arc path is lengthened, energy is dissipated rapidly, and the cooling effect is enhanced, thereby achieving rapid arc extinguishing, reducing contact erosion, and improving breaking capacity and service life.

[0022] The arc-extinguishing device provided by this utility model makes full use of existing structural space through a reasonable arrangement of magnets, without increasing the length, width, or height of the arc-extinguishing device. It requires no adjustment to the external dimensions of existing electromagnetic switch components, enabling seamless integration and rapid upgrades with existing products. Without altering the external dimensions of the electromagnetic switch components, a traditional arc-extinguishing device can be upgraded to a high-efficiency arc-extinguishing system with arc rotation extinguishing function, and the arc-extinguishing performance is not reduced, and may even be improved. Since no redevelopment or design adjustments are required, electromagnetic switch components can be directly applied to this arc-extinguishing device, significantly simplifying the product upgrade process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a typical arc-extinguishing device in the prior art;

[0025] Figure 2 for Figure 1 The main view;

[0026] Figure 3 A schematic diagram of an arc-extinguishing device provided in a specific embodiment of this utility model;

[0027] Figure 4 for Figure 3 The main view;

[0028] Figure 5 This is a structural diagram of an arc-extinguishing device provided in a specific embodiment of the present invention;

[0029] Figure 6 for Figure 5 The main view;

[0030] Figure 7 This is a schematic diagram showing the force exerted on an electric arc by an arc-extinguishing device according to a specific embodiment of the present invention.

[0031] Figure 8 Another structural diagram of the arc-extinguishing device provided in a specific embodiment of this utility model;

[0032] Figure 9 for Figure 8 The main view;

[0033] Figure 10 for Figure 8Side view;

[0034] Figure 11 A structural diagram of the mounting block in an arc-extinguishing device provided in a specific embodiment of this utility model;

[0035] Figure 12 An exploded view of the mounting block and the horizontal magnet;

[0036] Figure 13 This is a schematic diagram showing the connection between the mounting block and the horizontal magnet.

[0037] Figure label:

[0038] 1-Static contact; 2-Vertical magnet; 3-Moving contact; 4-Horizontal magnet; 5-Mounting block; 51-Mounting groove; 52-Snap-on; 53-Limiting rib; 6-Base plate; 7-Gap. Detailed Implementation

[0039] The core of this invention is to provide an arc extinguishing device that upgrades the existing arc extinguishing device into an arc rotation arc extinguishing device without increasing the external size of the electromagnetic switch components, while enhancing the arc extinguishing effect.

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] In one specific embodiment, the arc-extinguishing device provided by this utility model is applied to an electromagnetic switch element. The electromagnetic switch element includes a base plate 6, a base mounted on the base plate 6, and two sets of moving contacts 3 and stationary contacts 1 mounted on the base. The arc-extinguishing device includes a horizontal magnet 4 located below the moving contacts 3 and spaced apart by a first predetermined distance, and a vertical magnet 2 located on the side of the moving contacts 3 and spaced apart by a second predetermined distance. The horizontal magnet 4 and the vertical magnet 2 are arranged in an L-shape. The vertical magnet 2 is arranged along the line connecting the two moving contacts 3. The projection of the moving contact 3 on the horizontal magnet 4 overlaps with the horizontal magnet 4, and the projection of the moving contact 3 on the vertical magnet 2 overlaps with the vertical magnet 2. The horizontal magnet 4 and the vertical magnet 2 work together to cause the arc generated between the moving contact 3 and the stationary contact 1 to rotate.

[0042] In the above structure, the arc extinguishing device is compact and rationally laid out, which can effectively extinguish the electric arc quickly and improve the breaking capacity and reliability of the electromagnetic switching element.

[0043] The arc-extinguishing device includes a horizontal magnet 4 and a vertical magnet 2. Please refer to [reference needed]. Figures 3 to 6 The horizontal magnet 4 is positioned below the moving contact 3, adjusting the magnet located at the outer end of the moving contact 3 in the prior art to the lower part of the moving contact 3. This fully utilizes the space below the moving contact 3 without increasing the overall height of the electromagnetic switch element. The vertical magnet 2 is positioned on the side of the moving contact 3, along the line connecting the two moving contacts 3, i.e., on the side of the moving contact 3 along its length, rather than at the end, thus not increasing the length of the electromagnetic switch element. Furthermore, the thickness of the vertical magnet 2 does not exceed the width of the electromagnetic switch element, therefore it does not increase the overall width of the element.

[0044] Normally, the closer the magnet is to the moving contact 3, the stronger the magnetic field. However, if the magnet is too close to the moving contact 3, arc spatter can cause thermal damage, structural changes, or the formation of corrosion initiation points on the magnet. Therefore, a safe distance needs to be set between the magnet and the moving contact 3. Specifically, the safe distance between the magnet and the moving contact 3 can be: a first predetermined distance, such as 1-3 mm, between the horizontal magnet 4 and the moving contact 3; and a second predetermined distance, such as 1-5 mm, between the vertical magnet 2 and the moving contact 3. This distance ensures the arc-extinguishing effect of the magnetic field while effectively preventing arc spatter from causing thermal damage, structural changes, or the formation of corrosion initiation points on the magnet, thereby protecting the mechanical properties and corrosion resistance of the magnet material and improving the reliability and service life of the arc-extinguishing device.

[0045] The projection of the moving contact 3 onto the horizontal magnet 4 overlaps with the horizontal magnet 4, and its projection onto the vertical magnet 2 also overlaps with the vertical magnet 2, ensuring that the magnetic field can effectively act on the arc region. The horizontal magnet 4 and the vertical magnet 2 are arranged in an L-shape, with the horizontal magnet 4 generating a vertical magnetic field and the vertical magnet 2 generating a horizontal magnetic field. The two magnetic fields are superimposed to form a rotating magnetic field.

[0046] When the moving contact 3 separates from the stationary contact 1, an electric arc is generated between them. At this time, the horizontal magnet 4 and the vertical magnet 2 work together to generate a composite magnetic field. The magnetic field lines of this field are distributed in a curved pattern, as shown in the image. Figure 7 As shown, the magnetic field acts on the electric arc, causing it to be subjected to the Lorentz force. Due to the rotational properties of the magnetic field, the electric arc produces a stable rotational motion under the action of the Lorentz force, and its trajectory changes from a straight line to a spiral rotation, thereby driving the electric arc to rotate.

[0047] During rotation, the electric arc is significantly elongated, its path is noticeably extended, and it comes into full contact with the surrounding arc-extinguishing medium (such as air or other gases). The rotational motion rapidly dissipates the arc energy, preventing the arc from lingering between contacts for extended periods, effectively shortening the arcing time, significantly improving arc-extinguishing performance, and enhancing cooling, thereby accelerating arc cooling and rapid extinguishing. Simultaneously, it effectively reduces contact erosion, improving breaking capacity and service life.

[0048] This invention provides a compact and efficient arc-extinguishing device. Two magnets are arranged in an L-shape and respectively positioned on the side and below the moving contact 3. By superimposing the magnetic fields in the horizontal and vertical directions, a rotating magnetic field is formed, enhancing the control of the electric arc, effectively lengthening the arc path, and achieving rapid rotation and extinguishing of the arc, thereby achieving efficient arc extinguishing. This device is particularly suitable for low-voltage electrical appliances such as electromagnetic relays and contactors that require high arc-extinguishing performance, and can significantly improve the reliability and safety of the equipment.

[0049] Meanwhile, due to the rational arrangement of the magnets, the existing structural space is fully utilized without increasing the length, width, or height of the arc-extinguishing device. No adjustments to the external dimensions of existing electromagnetic switching components are required, enabling seamless integration and rapid upgrades with existing products. Without altering the external dimensions of the electromagnetic switching components, traditional arc-extinguishing devices can be upgraded to highly efficient arc-extinguishing systems with arc rotation extinguishing capabilities, without compromising, and may even improve, arc-extinguishing performance. Since no redevelopment or design adjustments are needed, electromagnetic switching components can directly utilize this arc-extinguishing device, significantly simplifying the product upgrade process.

[0050] In addition, this magnet arrangement effectively reduces the temperature resistance requirements of plastic parts such as the base, eliminating the need for high-temperature resistant materials and thus reducing raw material costs, resulting in good economic efficiency and practicality.

[0051] Based on the above specific embodiments, the base is provided with a support groove for installing the vertical magnet 2, and the support groove is provided with a partition for isolating the vertical magnet 2 from the moving contact 3.

[0052] In one embodiment, the support groove is located on the side of the base near the moving contact 3, providing a precise installation position for the vertical magnet 2 so that the vertical magnet 2 can maintain a set distance from the moving contact 3, forming an effective magnetic field distribution. The support groove and the base can be integrally molded, reducing the number of parts and improving structural strength and installation accuracy. The shape of the support groove matches the shape of the vertical magnet 2, typically a circular, rectangular, or square groove, to ensure that the vertical magnet 2 can be securely embedded within it, preventing loosening or displacement. The depth and height of the support groove can be determined according to the dimensions of the vertical magnet 2, ensuring that the vertical magnet 2 maintains a precise second set distance from the moving contact 3 after installation, thereby achieving the best arc extinguishing effect.

[0053] A partition is installed in the support groove. The partition can be the side wall of the support groove, vertically positioned between the vertical magnet 2 and the moving contact 3, with one side facing the magnet and the other facing the moving contact 3. This partition isolates the vertical magnet 2 from the moving contact 3, preventing direct contact of the electric arc with the vertical magnet 2, avoiding damage to the magnet due to high-temperature arcing, and extending the magnet's service life. Simultaneously, it restricts the position of the magnet, preventing the vertical magnet 2 from moving towards the moving contact 3, ensuring stable installation. The partition and the support groove can be detachably connected, such as by a snap-fit ​​connection or a slot connection, for easy installation and maintenance.

[0054] The partition is typically a thin plate structure, and its thickness can be designed according to the distance between the vertical magnet 2 and the moving contact 3 to ensure effective isolation without interfering with the normal distribution of the magnetic field. The partition is made of insulating materials, such as high-temperature resistant plastics or ceramics, which have good insulation and heat resistance properties, and can effectively prevent the electric arc from burning and damaging the vertical magnet 2.

[0055] As can be seen from the above, the support groove and the partition plate achieve precise positioning, stable installation and effective protection of the vertical magnet 2, ensure that the magnetic field distribution between the vertical magnet 2 and the moving contact 3 is reasonable, avoid magnetic field interference, and ensure the stability and effectiveness of the electric arc rotation.

[0056] Based on the above specific embodiments, it also includes a mounting block 5 installed on the base plate 6. The top of the mounting block 5 is provided with a mounting groove 51, and the horizontal magnet 4 is embedded in the mounting groove 51.

[0057] In some embodiments, please refer to Figures 8 to 13 The mounting block 5 is located on the base plate 6 of the electromagnetic switch element, specifically below the moving contact 3, so that the horizontal magnet 4 can be accurately aligned with the moving contact 3 to form an effective magnetic field distribution.

[0058] The top of the mounting block 5 is provided with a mounting groove 51 specifically for mounting the horizontal magnet 4. The shape of the mounting groove 51 matches the shape of the horizontal magnet 4, and is usually a circular, rectangular or square groove to ensure that the horizontal magnet 4 can be firmly embedded in it.

[0059] The horizontal magnet 4 can be directly embedded in the mounting groove 51. There is usually a certain gap between the inner wall of the mounting groove 51 and the outer wall of the horizontal magnet 4 to avoid structural interference and to ensure the stability and adjustment flexibility of the magnet installation.

[0060] Alternatively, the sidewall of the mounting groove 51 can cooperate with the sidewall of the horizontal magnet 4 to achieve precise positioning of the horizontal magnet 4 in the width and length directions, preventing the magnet from shifting or loosening during use.

[0061] Mounting block 5 can accurately position the horizontal magnet 4 and ensure that the magnet is securely installed, preventing displacement or loosening during the operation of the electromagnetic switch element. The modular design of mounting block 5 makes the installation and removal of the horizontal magnet 4 more convenient, facilitating production assembly and subsequent maintenance.

[0062] Based on the above specific embodiments, the depth of the mounting groove 51 is matched with the thickness of the magnet. Preferably, the depth of the mounting groove 51 is greater than or equal to the thickness of the horizontal magnet 4. After the magnet is installed, it can be flush with or slightly lower than the surface of the mounting block 5, ensuring that the horizontal magnet 4 is completely embedded in the mounting groove 51, avoiding the magnet from protruding from the surface of the mounting block 5, ensuring a reliable safe distance between the horizontal magnet 4 and the moving contact 3, and preventing the electric arc from burning and damaging the horizontal magnet 4.

[0063] The upper part of the mounting groove 51 is provided with a buckle 52, which is a limiting structure provided on the upper part of the mounting groove 51. The buckle 52 is usually provided on at least one pair of opposite sidewalls of the mounting groove 51 to form a symmetrical structure to ensure the uniform distribution of the limiting force.

[0064] When the horizontal magnet 4 is inserted into the mounting groove 51, the lower surface of the buckle 52 abuts against the upper surface of the horizontal magnet 4 to form a limiting and fixing structure, thereby limiting and fixing the horizontal magnet 4 and preventing the magnet from loosening or falling off during use.

[0065] The precise fit between the mounting slot 51 and the buckle 52 ensures that the distance between the horizontal magnet 4 and the moving contact 3 is precisely controllable, thereby optimizing the magnetic field distribution, enhancing the arc rotation effect, and improving the arc extinguishing performance.

[0066] Based on the above specific embodiments, the buckle 52 is disposed on at least one pair of opposite sidewalls of the mounting groove 51, that is, disposed at symmetrical positions on both sides of the mounting groove 51. This symmetrical arrangement helps to provide a balanced limiting force when the horizontal magnet 4 is installed, prevents the magnet from tilting or loosening, and improves the stability and reliability of the assembly.

[0067] The snap fastener 52 is an inverted snap, and its upper surface gradually thins from the root where it connects to the side wall of the mounting groove 51 towards the end, forming a guide slope. This structure allows the snap fastener 52 to elastically deform when the magnet is inserted, allowing the magnet to slide smoothly into the mounting groove 51. Preferably, the guide slope on the upper surface of the snap fastener 52 forms a guide angle of 17° to 23° to improve assembly smoothness. After insertion, the snap fastener 52 springs back, and its lower surface abuts against the upper surface of the magnet, achieving limiting and fixing. Preferably, an anti-dislodgement protrusion is provided at the opening of the mounting groove 51, which works in conjunction with the snap fastener 52 to further enhance the limiting effect.

[0068] The clip 52 is a limiting clip that serves multiple functions during assembly, including guiding, limiting, and preventing detachment. Specifically, the beveled surface of the upper surface of the clip 52 acts as a guide during magnet installation, facilitating the smooth insertion of the magnet into the mounting slot 51 and reducing assembly difficulty. After installation, the lower surface of the clip 52 abuts against the upper surface of the magnet, forming a mechanical limit to prevent the magnet from coming off under vibration or impact.

[0069] The clip 52 is usually made of a material with a certain degree of elasticity and toughness, such as plastic, to ensure that the clip 52 can undergo elastic deformation when the magnet is installed, and can return to its original shape after installation, forming a firm limiting fixation.

[0070] As can be seen from the above, the inverted structure of the buckle 52 enables the rapid installation, reliable positioning, and anti-detachment fixation of the horizontal magnet 4, reduces installation resistance, and improves the structural compactness and assembly efficiency of the arc extinguishing device without adding additional fasteners, making it easier for later maintenance and replacement.

[0071] Based on the above specific embodiments, a vertical sliding groove is provided on the side wall of the mounting groove 51, and the connecting end of the buckle 52 is slidably connected in the vertical sliding groove to realize the adjustable installation of the buckle 52 in the vertical direction.

[0072] In some embodiments, a vertical groove is provided on the side wall of the mounting groove 51, extending vertically to form a guide channel. The groove structure can limit the sliding trajectory of the buckle 52, preventing deviation or detachment and improving connection stability. The groove can have a rectangular cross-section, which is simple in structure and easy to process; it can also have a dovetail cross-section, which makes the fit between the buckle 52 and the groove tighter and prevents loosening; in addition, other cross-sectional shapes with guiding functions can also be used to guide the sliding direction of the buckle 52. Preferably, a stop structure is provided at both ends of the groove to prevent the buckle 52 from sliding out of the groove range and ensure installation reliability.

[0073] The connecting end of the snap fastener 52 (i.e., the end where the snap fastener 52 connects to the mounting groove 51) is slidably installed in the vertical slide groove, allowing it to move up and down along the groove to adjust its position in the vertical direction. The connecting end of the snap fastener 52 is threaded; after being inserted into the vertical slide groove and adjusted to the correct position, it is connected to the threaded connection via a nut and pressed against the side wall of the mounting groove 51, thus fixing the position of the snap fastener 52. The snap fastener 52 can be repeatedly adjusted within the slide groove, facilitating multiple assembly or replacement of the magnet and extending the device's service life. The slide groove and snap fastener 52 are integrated into the side wall of the mounting groove 51, occupying no extra space, resulting in a compact structure and contributing to the miniaturization of the overall structure.

[0074] The clip 52 is installed in the slide groove via a sliding connection and can move up and down as needed to adapt to magnets of different thicknesses or to fine-tune the installation height, thus improving assembly flexibility. This structure allows the clip 52 to be flexibly adjusted vertically, accommodating various specifications or sizes of horizontal magnets 4, enhancing the versatility of the arc-extinguishing device. By enabling the clip 52 to be adjusted vertically, the adaptability of the arc-extinguishing device to different magnets is improved. The clip 52 can be repeatedly adjusted within the slide groove, facilitating multiple assembly or replacement of magnets and extending the device's service life.

[0075] The clip 52 is installed in the slide groove via a sliding connection and can move up and down as needed to adapt to magnets of different thicknesses or to fine-tune the installation height, thus improving assembly flexibility. This structure allows the clip 52 to be flexibly adjusted in the vertical direction, suitable for horizontal magnets 4 of various specifications or sizes, enhancing the versatility of the arc-extinguishing device. By enabling the clip 52 to be adjusted vertically, the adaptability of the arc-extinguishing device to different magnets is improved.

[0076] Of course, the buckle 52 and the mounting groove 51 can be integrally molded to reduce the number of parts and improve structural strength and installation accuracy.

[0077] Based on the above specific embodiments, the bottom height of the mounting groove 51 is adjustable, and the adjustment structure is preferably tool-free or tool-free, facilitating quick on-site adjustment and maintenance. Specifically, this can be achieved through the following mechanical structures:

[0078] The threaded adjustment structure features a threaded hole and an adjusting screw at the bottom of the mounting groove 51. Height adjustment is achieved by rotating the screw to move the bottom surface up and down. This method offers high adjustment precision, a compact structure, and is suitable for miniaturized equipment.

[0079] The slide rail and locking structure connects the bottom surface to the side wall of the mounting groove 51 via the slide rail, and the position is fixed by locking screws or clips 52. During adjustment, the locking mechanism is loosened, the bottom surface is moved to the desired height, and then fixed again, making operation simple.

[0080] The wedge-shaped adjustment structure uses an inclined plane mechanism, where the bottom surface is raised or lowered by moving the wedge block laterally. This structure allows for stepless adjustment, and the adjustment process is smooth, reliable, and highly accurate.

[0081] The structure features elastic support and a limiting mechanism. A spring or spring plate supports the bottom surface, and a limiting groove or locking mechanism allows for multi-level height adjustment. This structure is simple and low-cost.

[0082] By adjusting the height of the bottom surface of the mounting groove 51, the distance between the horizontal magnet 4 and the moving contact 3 can be precisely and flexibly adjusted, thereby optimizing the magnetic field distribution and improving the arc extinguishing effect. The same mounting groove 51 can be adapted to magnets of different thicknesses, which can meet the needs of magnets with different installation requirements, enhance the versatility and flexibility of the device, and reduce design and manufacturing costs.

[0083] Based on the above-described specific embodiments, a gap is provided between the top surface of the mounting block 5 and the bottom surface of the moving contact 3. During the operation of the electromagnetic switch element, the moving contact 3 will move up and down. The gap effectively prevents the moving contact 3 from contacting or colliding with the mounting block 5 during movement, ensuring smooth operation. The moving contact 3 generates heat due to the electric arc or current at the moment of energization or disconnection. The reserved gap provides space for its thermal expansion, avoiding structural jamming or deformation.

[0084] Preferably, the gap between the top surface of the mounting block 5 and the bottom surface of the moving contact 3 is equal to the safe distance between the horizontal magnet 4 and the moving contact 3, ensuring that the distance between the horizontal magnet 4 and the moving contact 3 is greater than the safe distance, and preventing the electric arc from burning and damaging the horizontal magnet 4.

[0085] Based on the above-described specific embodiments, a gap is provided between the inner wall of the mounting groove 51 and the outer wall of the horizontal magnet 4. The existence of this gap makes it easier to insert or remove the horizontal magnet 4 during installation or replacement, avoiding assembly difficulties or magnet damage due to interference fits, and ensuring the stability and adjustment flexibility of the magnet installation. If the mounting groove 51 and the magnet were tightly fitted, the magnet might be deformed under pressure due to external forces or temperature changes, affecting the magnetic field distribution and arc-extinguishing performance. The gap design avoids such problems.

[0086] Based on the above specific embodiments, the side wall of the mounting block 5 is matched with the inner wall of the base. Specifically, a matching shape can be used, such as a rectangle, a boss, and a groove, to achieve precise positioning and limiting of the mounting block 5 in the width (left and right) and length (front and back) directions.

[0087] When the mounting block 5 is inserted into the base, the mating structure can be mutually fitted or interlocked by the inner wall restricting the side wall, or the two can have a set amount of movement to limit their lateral movement distance, ensuring that the offset of the mounting block 5 in the horizontal plane is controllable.

[0088] This structure allows for initial positioning without the need for additional fasteners, simplifying the assembly process and improving assembly efficiency and structural stability.

[0089] Based on the above specific embodiments, the mounting block 5 is provided with a limiting rib 53, which can be a protruding rib, a retaining edge, a step, or other structure, used to cooperate with the base to achieve installation limitation in the height direction.

[0090] When the mounting block 5 is inserted into the base in the vertical direction, after the mounting block 5 is installed into the base, the limiting rib 53 abuts against or has a small gap with the corresponding structure such as the limiting groove, support surface or stop on the base. The base and the bottom plate 6 limit the upper and lower parts of the mounting block 5 respectively, forming a height limit, ensuring that the offset of the mounting block 5 in the height direction is controllable.

[0091] This structure effectively prevents the mounting block 5 from shaking or coming off in the vertical direction, thus enhancing the overall stability of the structure.

[0092] As can be seen from the above, the installation block 5 has a compact structure, is easy to assemble, and has reliable positioning.

[0093] In one embodiment, the horizontal magnet 4 and the vertical magnet 2 are respectively arranged below and to the side of the moving contact 3, forming an L-shaped magnetic field structure. To achieve the best arc-extinguishing effect, the following optimizations can be made.

[0094] The surface area of ​​the horizontal magnet 4 covers more than half of the projected area of ​​the moving contact 3 on the horizontal magnet 4. Preferably, the surface area of ​​the horizontal magnet 4 completely covers the projected area of ​​the moving contact 3 on the horizontal magnet 4, ensuring effective coverage of the area of ​​the moving contact 3 by the magnetic field.

[0095] The vertical centerline of the horizontal magnet 4 (i.e., the centerline along the length of the magnet) coincides with the vertical centerline of the moving contact 3. This centered arrangement ensures that the magnetic field is symmetrically distributed on both sides of the moving contact 3, which is beneficial for uniform arc force and stable rotation.

[0096] The surface area of ​​the vertical magnet 2 also covers more than half of the projected area of ​​the moving contact 3 on the vertical magnet 2. Preferably, the surface area of ​​the vertical magnet 2 completely covers the projected area of ​​the moving contact 3 on the vertical magnet 2, and the magnetic field of the vertical magnet 2 has a greater effect on the moving contact 3.

[0097] The horizontal centerline of the vertical magnet 2 (i.e., the centerline along the height of the magnet) coincides with the horizontal centerline of the moving contact 3. This design ensures that the magnetic field is symmetrically distributed in the vertical direction of the moving contact 3, further enhancing the stability of the arc rotation and the arc extinguishing efficiency.

[0098] Through a dual design of centerline coincidence and area coverage, the magnetic field is symmetrically distributed around the moving contact 3, ensuring balanced arc force and stable rotation trajectory. The large magnetic field coverage elongates and rotates the arc under the influence of the magnetic field, accelerating cooling and achieving more thorough deionization, thus enabling rapid arc extinguishing. This arrangement maximizes the utilization of the magnetic field without increasing the overall size and is suitable for the structural framework of existing electromagnetic switching components.

[0099] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0100] The arc-extinguishing device provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, this utility model is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An arc-extinguishing device applied to an electromagnetic switching element, the electromagnetic switching element comprising a base plate (6), a base mounted on the base plate (6), two sets of moving contacts (3) and stationary contacts (1) mounted on the base, characterized in that, The arc extinguishing device includes a horizontal magnet (4) located below the moving contact (3) and spaced apart by a first predetermined distance, and a vertical magnet (2) located on the side of the moving contact (3) and spaced apart by a second predetermined distance. The horizontal magnet (4) and the vertical magnet (2) are arranged in an L-shape. The vertical magnet (2) is arranged along the line connecting the two moving contacts (3). The projection of the moving contact (3) on the horizontal magnet (4) overlaps with the horizontal magnet (4), and the projection of the moving contact (3) on the vertical magnet (2) overlaps with the vertical magnet (2). The horizontal magnet (4) and the vertical magnet (2) work together to cause the electric arc generated between the moving contact (3) and the stationary contact (1) to rotate.

2. The device of claim 1, wherein, The base is provided with a support groove for installing the vertical magnet (2), and the support groove is provided with a partition for isolating the vertical magnet (2) from the moving contact (3).

3. The device of claim 1, wherein, It also includes a mounting block (5) installed on the base plate (6), the top of the mounting block (5) is provided with a mounting groove (51), and the horizontal magnet (4) is embedded in the mounting groove (51).

4. The device of claim 3, wherein, The upper part of the mounting groove (51) is provided with a buckle (52), and the depth of the mounting groove (51) is greater than or equal to the thickness of the horizontal magnet (4). When the horizontal magnet (4) is embedded in the mounting groove (51), the lower surface of the buckle (52) abuts against the upper surface of the horizontal magnet (4) to achieve the limiting and fixing of the horizontal magnet (4).

5. The device of claim 4, wherein, The buckle (52) is disposed on at least one pair of opposite sidewalls of the mounting groove (51), and the buckle (52) is an undercut whose upper surface gradually thins from the root connected to the sidewall of the mounting groove (51) towards the end.

6. The device of claim 4, wherein, The mounting groove (51) has a vertical sliding groove on its side wall. The connecting end of the buckle (52) is slidably connected in the vertical sliding groove so as to realize the adjustable installation of the buckle (52) in the vertical direction.

7. The device of claim 4, wherein, The bottom height of the mounting groove (51) is adjustable to adjust the distance between the horizontal magnet (4) and the moving contact (3).

8. The device of claim 3, wherein, A gap is provided between the top surface of the mounting block (5) and the bottom surface of the moving contact (3), and a gap is provided between the inner wall of the mounting groove (51) and the outer wall of the horizontal magnet (4).

9. The device of claim 3, wherein, The side wall of the mounting block (5) cooperates with the inner wall of the base to achieve installation limitation of the mounting block (5) in the width and length directions; the mounting block (5) is provided with a limiting rib (53) for cooperating with the base to achieve installation limitation in the height direction.

10. The device of claim 1, wherein, The area of ​​the horizontal magnet (4) covers the projected area of ​​the moving contact (3) on the horizontal magnet (4), and the vertical center line of the horizontal magnet (4) coincides with the vertical center line of the moving contact (3); the area of ​​the vertical magnet (2) covers the projected area of ​​the moving contact (3) on the vertical magnet (2), and the horizontal center line of the vertical magnet (2) coincides with the horizontal center line of the moving contact (3).

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