A DC relay based on magnetic steel for arc extinguishing

Abstract

This invention discloses a DC relay for arc extinguishing based on magnets, comprising a ceramic cover, a stationary contact, a moving spring, a yoke plate, a metal frame, an insulating base, and several magnets. The magnets are respectively positioned next to the moving spring corresponding to the stationary and moving contacts, utilizing the magnetic field generated by the magnets to extinguish the arc. The insulating base is mounted on the yoke plate and has a surrounding wall and a support platform. The support platform fits under the bottom of the ceramic cover and has a groove in which an elastically deformable sealing ring is embedded. The deformable portion of the sealing ring extends along the gap between the inner wall of the ceramic cover and the surrounding wall of the insulating base, and the gap between the bottom surface of the ceramic cover and the support platform of the insulating base. This invention utilizes the sealing ring to effectively prevent the formation of a metal path between metal spatter adhering to the inner wall of the ceramic cover and the metal on the bottom surface of the ceramic cover due to arc extinguishing by the magnets, thereby improving insulation performance.

Description

Technical Field

[0001] This invention relates to a DC relay, and more particularly to a DC relay based on a magnet for arc extinguishing. Background Art

[0002] Most existing DC relays adopt a direct-acting reed (also known as a solenoid direct-acting) design. Their contact parts consist of two stationary contacts and one moving reed. The two stationary contacts are typically mounted on top of a ceramic housing, with their bottom ends extending into the housing. The moving reed, being a direct-acting type, is located inside the ceramic housing, with its two ends engaging with the two stationary contacts. When the moving reed is in contact with both stationary contacts, current flows in through one of the contacts, passes through the moving reed, and exits through the other. The moving reed is mounted on one end of a push rod assembly, the other end of which is connected to the moving iron core of the magnetic circuit. When current flows through the coil, causing the push rod assembly to move upwards, the moving reed contacts the two stationary contacts, connecting the load. When the current is disconnected, the push rod assembly moves downwards under the action of a return spring, separating the moving reed from the two stationary contacts, disconnecting the load. When this type of DC relay is used in high-voltage environments, a magnet needs to be placed near the contacts to extinguish the arc. Therefore, in practical applications, there are frequent situations where the arc needs to be interrupted. However, the arc energy is extremely high, easily burning the contacts and causing the contact surface to melt. Under the magnetic force of the magnet, liquid metal splashes, eventually forming a metal path on the inner wall of the ceramic cover in the later stages of its lifespan, leading to poor insulation. To solve this technical problem, such as... Figure 1 , Figure 2 As shown, Figure 1 This is a cross-sectional view of a partial structure of a prior art DC relay. Figure 2 for Figure 1 The enlarged schematic diagram of part A in the prior art shows that in this type of DC relay, an insulating base 200 is installed inside the arc-extinguishing cavity formed mainly by the ceramic cover 100. The yoke plate 300 is fixed to the bottom end of the ceramic cover 100 by a metal frame 400. The insulating base 200 is usually installed on the yoke plate 300 to isolate the splashed metal and achieve the purpose of protecting the insulation. However, in this type of DC relay, because there is a gap between the insulating base 200 and the inner wall of the ceramic cover 100, it cannot play a complete isolation role. The metal vapor particles generated by the arc extinguishing of the magnet will still fall into the gap, so that the metal splashes attached to the inner wall of the ceramic cover 100 and the metal on the bottom surface of the ceramic cover 100 form a metal path, resulting in poor insulation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a DC relay based on magnet for arc extinguishing. Through structural improvements, it can effectively prevent the formation of a metal path between metal spatter adhering to the inner wall of the ceramic cover and the metal on the bottom surface of the ceramic cover, thereby improving the insulation performance.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: a DC relay based on magnets for arc extinguishing, comprising a ceramic cover, stationary contacts, a moving spring, a yoke plate, a metal frame, an insulating base, and several magnets; the ceramic cover is fixed to the metal frame through a metallized layer at its bottom, and the bottom of the metal frame is fixed to the yoke plate; two stationary contacts are respectively fixed to the top of the ceramic cover, and the stationary contact points at their bottom are accommodated in the cavity of the ceramic cover; the moving spring is a straight plate type, and the moving contact points at both ends of the moving spring are respectively fitted below the two stationary contacts in the cavity; the several magnets are respectively arranged next to the moving spring corresponding to the moving and stationary contacts, so as to realize arc extinguishing by utilizing the magnetic field formed by the magnets; the insulating base... The insulating seat is mounted on the yoke plate. An upward-protruding wall is provided along the edge of the insulating seat. The edge of the insulating seat also has a horizontally protruding support that surrounds the entire perimeter. The support of the insulating seat fits under the bottom of the ceramic cover. A groove surrounding the entire perimeter is provided on the platform of the support of the insulating seat. An elastically deformable sealing ring is embedded in the groove so that when the bottom surface of the ceramic cover presses against the sealing ring, the sealing ring deforms. The deformed part of the sealing ring extends along the gap between the inner wall of the ceramic cover and the wall of the insulating seat, and the gap between the bottom surface of the ceramic cover and the support of the insulating seat. This can prevent metal spatter adhering to the inner wall of the ceramic cover due to the arc extinguishing of the magnet from forming a metal path with the metal on the bottom surface of the ceramic cover.

[0005] The plurality of magnets consists of four magnets, which are respectively arranged on both sides of the width of the moving spring at positions corresponding to the moving and stationary contacts. The magnetic poles of the two magnets corresponding to the same pair of moving and stationary contacts are opposite on the side facing the moving and stationary contacts, while the magnetic poles of the two magnets corresponding to the same side of the width of the moving spring are the same on the side facing the corresponding moving and stationary contacts. A yoke clamp is also connected between the two magnets corresponding to the same pair of moving and stationary contacts. The four magnets are respectively arranged at positions directly opposite the moving and stationary contacts.

[0006] Of the four magnets, the two magnets on the left side corresponding to the current flow direction of the moving reed are designated as N poles on the side facing the corresponding moving and stationary contacts.

[0007] The plurality of magnets consists of four magnets, which are respectively arranged on both sides of the width of the moving spring at positions corresponding to the moving and stationary contacts. The magnetic poles of the two magnets corresponding to the same pair of moving and stationary contacts are set to be the same on the side facing the moving and stationary contacts. A yoke clamp is also connected between the two magnets corresponding to the same pair of moving and stationary contacts. The four magnets are respectively arranged at positions directly opposite the moving and stationary contacts.

[0008] Of the four magnets, the magnetic poles on the sides of the two magnets corresponding to the width of the moving spring and facing the corresponding moving and stationary contacts are set to be the same.

[0009] Of the four magnets, the magnetic poles of the two magnets on the same side of the width of the moving spring are set to be opposite on the side facing the corresponding moving and stationary contacts.

[0010] The plurality of magnets consists of four magnets, which are respectively arranged on both sides of the width of the moving spring at positions corresponding to the moving and stationary contacts. The magnetic poles of the two magnets corresponding to the same pair of moving and stationary contacts are set to be opposite on the side facing the moving and stationary contacts. The magnetic poles of the two magnets corresponding to the same side of the width of the moving spring are also set to be opposite on the side facing the corresponding moving and stationary contacts. A yoke clamp is also connected between the two magnets corresponding to the same pair of moving and stationary contacts.

[0011] The two magnets corresponding to the same pair of moving and stationary contacts are set at an offset position relative to the same pair of moving and stationary contacts, and the two magnets are staggered.

[0012] The plurality of magnets are two magnets, which are respectively arranged at the two ends of the length of the moving spring at positions corresponding to the moving and stationary contacts, and the magnetic poles of the opposite sides of the two magnets are set to opposite; the two magnets are also connected to two yoke clamps, and the two yoke clamps further include at least two yoke segments located on both sides of the width of the moving spring at positions corresponding to the moving and stationary contacts; the two magnets are respectively arranged at positions directly opposite the moving and stationary contacts.

[0013] The yoke clamps are U-shaped, with the bottom walls of the two yoke clamps connected to the opposite sides of the two magnets, and the ends of the two side walls of the two yoke clamps forming corresponding yoke segments.

[0014] The yoke clamps are U-shaped, with the bottom walls of the two yoke clamps connected to the opposite sides of the two magnets respectively. The ends of the two side walls of the two yoke clamps extend beyond the width of the moving spring to the positions corresponding to the moving and stationary contacts. The two side walls of the two yoke clamps contain the yoke segments.

[0015] The yoke clamps are U-shaped, with the bottom walls of the two yoke clamps respectively fitting to both sides of the width of the movable spring, and the ends of the two side walls of the two yoke clamps respectively connected to the opposite sides of the two magnets.

[0016] The plurality of magnets consists of two magnets, which are respectively positioned on both sides of the width of the moving spring, corresponding to the moving and stationary contacts, and the moving and stationary contacts corresponding to the two magnets are different; each of the two magnets is also connected to a yoke clamp, which is L-shaped, with one side of the L-shape of the yoke clamp connected to the side of the corresponding magnet that is away from the moving and stationary contacts, and the other side of the L-shape of the yoke clamp located outside the two ends corresponding to the length of the moving spring; the two magnets are respectively positioned directly opposite the moving and stationary contacts.

[0017] The magnetic poles on the side of the two magnets facing the moving and stationary contacts are set to be the same.

[0018] The magnetic poles of the two magnets facing the moving and stationary contacts are set to be opposite.

[0019] The length of the sealing ring is slightly smaller than the length of the groove in the insulating seat, so that the sealing ring is elastically tensioned in the groove.

[0020] The insulating base also includes a base plate, and the surrounding wall is disposed in the edge of the base plate so that the surrounding wall and the base plate form an arc-extinguishing cavity, and the projection of the stationary contact and the moving spring on the insulating base is located in the arc-extinguishing cavity.

[0021] The enclosure is fully enclosed, surrounding the entire perimeter of the insulating base.

[0022] The enclosure is in the shape of two semi-enclosed sections, which are located on the outside of the projection positions corresponding to the two ends of the movable spring.

[0023] The arc-extinguishing cavity is also equipped with a grid structure to increase the arc-extinguishing size and creepage distance.

[0024] The grid structure in the arc-extinguishing cavity includes a first grid structure located at the outer edge of the projection position corresponding to the two ends of the moving spring, and the height of the first grid structure is greater than the height of the enclosure wall.

[0025] The top of the first grid structure is close to the edge of the corresponding end of the moving spring, and the first grid structure is semi-enclosed.

[0026] The grid structure in the arc-extinguishing cavity also includes a second grid structure located between the first grid structure and the enclosure wall. The second grid structure is arranged approximately along the length direction of the moving spring, and the height of the second grid structure is approximately the same as the height of the enclosure wall.

[0027] In the ceramic cover, at the position of the inner side wall, corresponding to the length direction of the moving spring, there are limiting ribs on both sides to limit the displacement of the moving spring to the two sides of the width during the up and down movement. The limiting ribs protrude to the edge of the first grid structure to block the electric arc.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. This invention employs a method of placing several magnets next to the moving and stationary contacts of the moving spring to extinguish the arc using the magnetic field generated by the magnets. Furthermore, the invention includes a groove surrounding the entire perimeter of the support platform of the insulating base, into which a resiliently deformable sealing ring is embedded. When the bottom surface of the ceramic cover mates with the support platform of the insulating base, the sealing ring is pressed against it, causing deformation. The deformed portion of the sealing ring extends along the gaps between the inner wall of the ceramic cover and the surrounding wall of the insulating base, and between the bottom surface of the ceramic cover and the support platform of the insulating base. This effectively prevents metal spatter adhering to the inner wall of the ceramic cover due to the arc extinguishing effect from forming a metal path with the metal on the bottom surface of the ceramic cover during arc extinguishing, thereby improving insulation performance.

[0030] 2. This invention, by designing the insulating base as an arc-extinguishing cavity and incorporating a grid structure within the arc-extinguishing cavity, can increase the arc elongation dimension under the action of the arc-extinguishing magnetic circuit, effectively saving on the height dimension of the DC relay and reducing its size.

[0031] 3. The present invention uses the design of the top of the first grid structure to be close to the edge of the corresponding end of the moving spring, and the first grid structure to be semi-enclosed, and the design of the limiting rib of the inner sidewall of the ceramic cover to protrude to the edge of the first grid structure, so as to block electric arc.

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the DC relay based on magnet for arc extinguishing of the present invention is not limited to the embodiments. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view of a partial structure of a prior art DC relay with an insulated base;

[0034] Figure 2 yes Figure 1 Enlarged diagram of part A in the diagram;

[0035] Figure 3 This is a schematic diagram of a partial structure of Embodiment 1 of the present invention;

[0036] Figure 4 This is a schematic diagram of the magnet distribution in Embodiment 1 of the present invention;

[0037] Figure 5 This is a cross-sectional view of a portion of the structure of Embodiment 1 of the present invention;

[0038] Figure 6 This is an exploded view of the assembly of the ceramic cover, insulating base, metal frame and yoke plate of the present invention;

[0039] Figure 7 yes Figure 5Enlarged schematic diagram of part B in the diagram;

[0040] Figure 8 This is a three-dimensional structural schematic diagram of the insulating base according to Embodiment 1 of the present invention;

[0041] Figure 9 This is a cross-sectional view of the insulating base according to Embodiment 1 of the present invention;

[0042] Figure 10 This is a cross-sectional view of the sealing ring being installed in the insulating base according to Embodiment 1 of the present invention;

[0043] Figure 11 This is a cross-sectional view of the structure of the ceramic cover with stationary contact and the insulating base in accordance with Embodiment 1 of the present invention.

[0044] Figure 12 This is a schematic diagram of the magnet distribution in Embodiment 2 of the present invention;

[0045] Figure 13 This is a schematic diagram of the magnet distribution in Embodiment 3 of the present invention;

[0046] Figure 14 This is a schematic diagram of the magnet distribution in Embodiment 4 of the present invention;

[0047] Figure 15 This is a schematic diagram of the magnet distribution in Embodiment 5 of the present invention;

[0048] Figure 16 This is a schematic diagram of the magnet distribution in Embodiment Six of the present invention;

[0049] Figure 17 This is a three-dimensional structural schematic diagram of the insulating base according to Embodiment Six of the present invention;

[0050] Figure 18 This is a cross-sectional view of the insulating base according to Embodiment Six of the present invention;

[0051] Figure 19 This is a cross-sectional view of the sealing ring being installed in the insulating base according to Embodiment Six of the present invention;

[0052] Figure 20 This is a cross-sectional view of the structure of the ceramic cover with stationary contact and the insulating base in embodiment seven of the present invention.

[0053] Figure 21 This is a schematic diagram of the magnet distribution in Embodiment 8 of the present invention;

[0054] Figure 22 This is a schematic diagram of the magnet distribution in Embodiment Nine of the present invention;

[0055] Figure 23 This is a schematic diagram of the magnet distribution in Embodiment 10 of the present invention;

[0056] Figure 24 This is a schematic diagram of the magnet distribution in Embodiment Eleven of the present invention;

[0057] Figure 25 This is a schematic diagram of the magnet distribution in Embodiment Twelve of the present invention;

[0058] Figure 26 This is a schematic diagram of the magnet distribution in Embodiment Thirteen of the present invention;

[0059] Figure 27 This is a schematic diagram of the magnet distribution in Embodiment Fourteen of the present invention;

[0060] Figure 28 This is a schematic diagram of the magnet distribution in Embodiment 15 of the present invention. Detailed Implementation

[0061] Example 1

[0062] See Figures 3 to 11 As shown, the present invention discloses a DC relay for arc extinguishing based on magnets, comprising a ceramic cover 1, stationary contacts 2, a moving spring 3, a yoke plate 4, a metal frame 5, an insulating base 6, and several magnets 81. The ceramic cover 1 has a cover-shaped structure with its opening facing downwards. The bottom surface of the ceramic cover 1 is provided with a metallized layer. The ceramic cover 1 is fixed to the upper end of the metal frame 5 through the metallized layer, and the lower end of the metal frame 5 is fixed to the yoke plate 4. The ceramic cover 1, the metal frame 5, and the yoke plate 4 form a cavity 11. Two stationary contacts 2 are respectively fixed to the top end (i.e., the top wall) of the ceramic cover 1, and the stationary contact points at the bottom end of the stationary contacts 2 extend into the cavity 11. The moving spring 3 is a straight plate type, and the moving contact points at both ends of the moving spring 3 are respectively engaged below the two stationary contacts 2 in the cavity 11, that is, the two ends of the moving spring 3 are respectively engaged with the bottom ends of the two stationary contacts 2. The moving spring 3 is mounted on the push rod component. At the top of 7, the bottom of the push rod component 7 passes through the yoke plate 4 and connects to the moving iron core of the magnetic circuit section; several magnets 81 are respectively arranged next to the moving spring 3 at positions corresponding to the moving and stationary contacts (i.e., corresponding moving and stationary contacts) to achieve arc extinguishing using the magnetic field formed by the magnets; in this embodiment, there are four magnets 81, which are located outside the ceramic cover 1. The four magnets 81 are respectively arranged on both sides of the width of the moving spring at positions corresponding to the moving and stationary contacts (i.e., corresponding moving and stationary contacts), and the magnetic poles of the two magnets 81 corresponding to the same pair of moving and stationary contacts are opposite on the side facing the moving and stationary contacts, while the magnetic poles of the two magnets 81 corresponding to the same side of the width of the moving spring are the same on the side facing the corresponding moving and stationary contacts. A yoke clamp 82 is also connected between the two magnets corresponding to the same pair of moving and stationary contacts; in this embodiment, as Figure 4As shown, the left stationary contact 2 is where current flows in, and the right stationary contact 2 is where current flows out. Therefore, in the moving reed 3, the current flows from the end closer to the left stationary contact 2 to the other end closer to the right stationary contact 2. The four magnets 81 are respectively positioned opposite the moving and stationary contacts; Figure 4 As shown, among the four magnets 81, the two magnets 81 on the left side corresponding to the current flow direction of the moving spring have their magnetic poles facing the corresponding moving and stationary contacts as N poles, and the two magnets 81 on the right side corresponding to the current flow direction of the moving spring have their magnetic poles facing the corresponding moving and stationary contacts as S poles. The yoke clamp 82 is roughly U-shaped, with the bottom wall of the U-shape of the yoke clamp 82 corresponding to the outer ends of the corresponding ends of the length of the moving spring 3. The two side walls of the U-shape of the yoke clamp 82 are respectively connected to the back sides of the two magnets 81 corresponding to the moving and stationary contacts of the same pair of moving and stationary contacts. The insulating seat 6 is mounted on the yoke plate 4, and the edge of the insulating seat 6 has an upwardly protruding wall 61. The edge of the insulating seat 6 also has a horizontally protruding ring. The support platform 62 surrounds the entire perimeter of the insulating base 6 and fits under the bottom of the ceramic cover 1. A groove 63 surrounding the entire perimeter is also provided on the platform surface of the support platform 62 of the insulating base 6. An elastically deformable sealing ring 64 is embedded in the groove 63 so that when the bottom end face of the ceramic cover 1 presses against the sealing ring 64, the sealing ring 64 deforms. A portion 641 of the deformed sealing ring 64 extends along the gap between the inner wall of the ceramic cover 1 and the perimeter wall 61 of the insulating base, and another portion 642 of the deformed sealing ring 64 extends along the gap between the bottom end face 12 of the ceramic cover 1 and the support platform 62 of the insulating base. This can prevent metal spatter adhering to the inner wall of the ceramic cover due to the arc extinguishing of the magnet from forming a metal passage with the metal on the bottom end face 12 of the ceramic cover.

[0063] In this embodiment, the insulating base 6 further includes a base plate 65, and the surrounding wall 61 is disposed in the edge of the base plate 65, so that the surrounding wall 61 and the base plate 65 form an arc-extinguishing cavity 66, and the projections of the stationary contact 2 and the moving spring 3 on the insulating base are located in the arc-extinguishing cavity. The base plate 65 is provided with at least a through hole 651 through which the push rod component 7 can pass.

[0064] In this embodiment, the enclosure 61 is a two-part semi-enclosed shape, with the two semi-enclosed enclosure 61 located on the outside of the projection positions corresponding to the two ends of the movable spring 3.

[0065] In this embodiment, the arc-extinguishing cavity 66 is also provided with a grid structure to increase the arc-extinguishing size and creepage distance.

[0066] In this embodiment, the grid structure in the arc-extinguishing cavity includes a first grid structure 67 located at the outer edge of the projection position corresponding to the two ends of the moving spring, and the height of the first grid structure 67 is greater than the height of the enclosure wall.

[0067] In this embodiment, the top end of the first grid structure 67 is close to the edge of the corresponding end of the movable spring 3, and the first grid structure 67 is semi-enclosed.

[0068] In this embodiment, the grid structure in the arc extinguishing cavity further includes a second grid structure 68 located between the first grid structure 67 and the enclosure wall 61. The second grid structure 68 is arranged approximately along the length direction of the moving spring 3, and the height of the second grid structure 68 is approximately the same as the height of the enclosure wall 61.

[0069] In this embodiment, in the ceramic cover 1, at the position of the inner side wall, corresponding to the length direction of the moving spring, there are limiting ribs 13 on both sides to limit the moving spring 3 from shifting to the width sides during the up and down movement.

[0070] In this embodiment, the magnetic field formed by the cooperation of the four magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 4 The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Since the magnetic blowing force is directed outward, it does not interfere with each other.

[0071] The DC relay in this embodiment has a load polarity requirement, and the arc extinguishing capabilities differ greatly between the forward and reverse directions. When connected in reverse, the directions of the two magnetic blow-out forces will be towards the inside, and they will affect each other.

[0072] This invention discloses a DC relay for arc extinguishing based on magnets. Four magnets 81 are respectively positioned on both sides of the width of the moving spring 3, corresponding to the moving and stationary contacts. The magnetic poles of the two magnets 81 corresponding to the same pair of moving and stationary contacts are opposite on the side facing the moving and stationary contacts, while the magnetic poles of the two magnets 81 corresponding to the same side of the width of the moving spring 3 are the same on the side facing the corresponding moving and stationary contacts. A yoke clamp 82 is connected between the two magnets 81 corresponding to the same pair of moving and stationary contacts. A groove 63 surrounding the entire perimeter is provided on the platform 62 of the insulating base 6. A resiliently deformable sealing ring 64 is embedded in the groove 63. When the bottom end face 12 of the ceramic cover 1 mates with the support platform 62 of the insulating seat, it presses against the sealing ring 64, causing the sealing ring 64 to deform. The deformed part of the sealing ring extends along the gap between the inner wall of the ceramic cover and the surrounding wall of the insulating seat, and the gap between the bottom end face of the ceramic cover and the support platform of the insulating seat. Thus, when the arc-extinguishing magnetic field composed of the four magnets 81 performs arc extinguishing, it can prevent the formation of a metal path between the metal spatter adhering to the inner wall of the ceramic cover due to the arc extinguishing of the magnets and the metal on the bottom end face of the ceramic cover, thereby improving the insulation performance.

[0073] The present invention discloses a DC relay based on magnet for arc extinguishing, which adopts an insulating base 6 designed as an arc extinguishing cavity 66, and has a grid structure in the arc extinguishing cavity 66, which can increase the size of the arc elongation under the action of the arc extinguishing magnetic circuit, effectively saving the height of the DC relay and reducing its volume.

[0074] Example 2

[0075] See Figure 12 As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment 1 in that four magnets 81 are respectively arranged on both sides of the width of the moving spring, corresponding to the moving and stationary contacts (i.e., corresponding moving and stationary contacts), and the magnetic poles of the two magnets 81 corresponding to the same pair of moving and stationary contacts facing the moving and stationary contacts are set to be the same. A yoke clamp 82 is also connected between the two magnets 81 corresponding to the same pair of moving and stationary contacts; as shown Figure 12 As shown, among the four magnets 81, the magnetic poles of the two magnets 81 on the same side of the width of the moving spring 3 facing the corresponding moving and stationary contacts are set to be the same. That is, among the four magnets 81, the magnetic poles of the two magnets 81 on the left side of the current flow direction of the moving spring facing the corresponding moving and stationary contacts are set to N poles, and the magnetic poles of the two magnets 81 on the right side of the current flow direction of the moving spring facing the corresponding moving and stationary contacts are also set to N poles. The yoke clamp 82 is roughly U-shaped. The bottom wall of the U-shape of the yoke clamp 82 is located at the outer end of the corresponding end of the length of the moving spring 3. The two side walls of the U-shape of the yoke clamp 82 are respectively connected to the back of the two magnets 81 corresponding to the moving and stationary contacts of the same pair of moving and stationary contacts.

[0076] In this embodiment, the magnetic field formed by the cooperation of the four magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 12 The magnetic blowout force, indicated by the middle arrow, acts in two directions to extinguish the arc at the two pairs of moving and stationary contacts. Since the direction of the magnetic blowout force is always outward (i.e.,...),... Figure 12 (diagonally above) and they will not interfere with each other.

[0077] The DC relay in this embodiment has no polarity requirement for the load, and its arc extinguishing capabilities are equal in both forward and reverse directions. When connected in reverse, the directions of the two magnetic blow forces are both outward (i.e., diagonally downward), and they will not affect each other.

[0078] Example 3

[0079] See Figure 13As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment 2 in that, among the four magnets 81, the magnetic poles of the two magnets 81 on the left side corresponding to the current flow direction of the moving reed are set as S poles on the side facing the corresponding moving and stationary contacts, and the magnetic poles of the two magnets 81 on the right side corresponding to the current flow direction of the moving reed are also set as S poles on the side facing the corresponding moving and stationary contacts; the magnetic field formed by the four magnets 81 and the two yoke clamps 82 can form as follows: Figure 13 The magnetic blowout force, indicated by the middle arrow, acts in two directions to extinguish the arc at the two pairs of moving and stationary contacts. Since the direction of the magnetic blowout force is always outward (i.e.,...),... Figure 13 (diagonally below in the middle), they will not interfere with each other.

[0080] Example 4

[0081] See Figure 14 As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment 2 in that, among the four magnets 81, the magnetic poles of the two magnets 81 on the same side of the width of the moving spring are opposite on the side facing the corresponding moving and stationary contacts; that is, among the four magnets 81, the magnetic poles of the two magnets 81 corresponding to the left moving and stationary contacts are N poles, and the magnetic poles of the two magnets 81 corresponding to the right moving and stationary contacts are S poles; thus, the magnetic poles of the two magnets 81 on the left side of the width of the moving spring are opposite on the side facing the corresponding moving and stationary contacts, and the magnetic poles of the two magnets 81 on the right side of the width of the moving spring are also opposite on the side facing the corresponding moving and stationary contacts. The magnetic field formed by the four magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 14 The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Since the direction of the magnetic blowing force is outward (slanting upward on the left and slanting downward on the right), they do not interfere with each other.

[0082] Example 5

[0083] See Figure 15As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment 2 in that, among the four magnets 81, the magnetic poles of the two magnets 81 on the same side of the width of the moving spring are opposite on the side facing the corresponding moving and stationary contacts; that is, among the four magnets 81, the magnetic poles of the two magnets 81 corresponding to the left moving and stationary contacts are S poles, and the magnetic poles of the two magnets 81 corresponding to the right moving and stationary contacts are N poles; thus, the magnetic poles of the two magnets 81 on the left side of the width of the moving spring are opposite on the side facing the corresponding moving and stationary contacts, and the magnetic poles of the two magnets 81 on the right side of the width of the moving spring are also opposite on the side facing the corresponding moving and stationary contacts. The magnetic field formed by the four magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 15 The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Since the magnetic blowing force is directed outward (slanting downward on the left and slanting upward on the right), it will not interfere with each other.

[0084] Example 6

[0085] See Figures 16 to 19 As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment 1 in that four magnets 81 are respectively arranged on both sides of the width of the moving spring 3 at positions corresponding to the moving and stationary contacts (i.e., corresponding moving and stationary contacts). The magnetic poles of the two magnets 81 corresponding to the same pair of moving and stationary contacts facing the moving and stationary contacts are set to opposite directions. Similarly, the magnetic poles of the two magnets 81 on the same side of the width of the moving spring 3 facing the corresponding moving and stationary contacts are also set to opposite directions. A yoke clamp 82 is also connected between the two magnets 81 corresponding to the same pair of moving and stationary contacts. Figure 16As shown, among the four magnets 81, in the two magnets 81 on the left side of the current flow direction of the moving reed, the magnet 81 closer to the left stationary contact 2 has its magnetic pole facing the corresponding moving and stationary contact as the N pole, and the magnet 81 closer to the right stationary contact 2 has its magnetic pole facing the corresponding moving and stationary contact as the S pole. In the two magnets 81 on the right side of the current flow direction of the moving reed, the magnet 81 closer to the left stationary contact 2 has its magnetic pole facing the corresponding moving and stationary contact as the S pole, and the magnet 81 closer to the right stationary contact 2 has its magnetic pole facing the corresponding moving and stationary contact as the S pole. The magnetic pole of the magnet 81 on the stationary contact 2 side facing the corresponding moving and stationary contact is set as the N pole; the two magnets 81 corresponding to the same pair of moving and stationary contacts are set at an offset position relative to the same pair of moving and stationary contacts, and the two magnets 81 are staggered; the yoke clip 82 is roughly U-shaped, the bottom wall of the U-shape of the yoke clip 82 corresponds to the outer end of the corresponding end of the length of the moving spring 3, and the two side walls of the U-shape of the yoke clip 82 are respectively connected to the back of the two magnets 81 corresponding to the same pair of moving and stationary contacts.

[0086] In this embodiment, the enclosure 61 is a fully enclosed shape, and the enclosure 61 surrounds the entire periphery of the insulating base.

[0087] In this embodiment, the magnetic field formed by the cooperation of the four magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 4 The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Since the magnetic blowing force is directed diagonally upward in the same direction, it will not interfere with each other.

[0088] The DC relay in this embodiment has no polarity requirement for the load, and its arc extinguishing capabilities are equal in both forward and reverse directions. When connected in reverse, the two magnetic blow forces are directed diagonally downward in the same direction and will not affect each other.

[0089] The present invention provides a DC relay for arc extinguishing based on magnets. Since one of the two magnetic blowing forces points to the middle position, the enclosure 61 adopts a fully enclosed shape to facilitate arc extinguishing.

[0090] Example 7

[0091] See Figure 20 As shown, the DC relay based on magnet arc extinguishing of the present invention differs from Embodiment Six in that the enclosure 61 is a two-segment semi-enclosed shape, and the two segments of the enclosure 61 are respectively located on the outer side of the projection positions corresponding to the two ends of the moving spring 3; and in the ceramic cover 1, at the position of the inner side wall, corresponding to the two sides of the moving spring in the length direction, there are limiting ribs 13 to limit the moving spring from shifting to the two sides of the width during the up and down movement, and the limiting ribs 13 protrude to the edge of the first grid structure 67.

[0092] In this embodiment, since the enclosure 61 is designed as a two-part semi-enclosed shape, meaning there is no enclosure 61 in the middle area, the limiting ribs 13 on the inner sidewall of the ceramic cover 1 are designed to protrude to the edge of the first grid structure 67, thereby forming a retaining wall. Figure 20 As shown (the arrows in the diagram indicate the direction of the magnetic blowout force), it can block one of the magnetic blowout forces on the right from directing the electric arc towards the middle region.

[0093] Example 8

[0094] See Figure 21 As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment Six in that, among the four magnets 81, in the two magnets 81 on the left side of the current flow direction of the moving reed, the magnet 81 near the left stationary contact 2 has its magnetic pole facing the corresponding moving and stationary contact as an S pole, and the magnet 81 near the right stationary contact 2 has its magnetic pole facing the corresponding moving and stationary contact as an N pole. In the two magnets 81 on the right side of the current flow direction of the moving reed, the magnet 81 near the left stationary contact 2 has its magnetic pole facing the corresponding moving and stationary contact as an N pole, and the magnet 81 near the right stationary contact 2 has its magnetic pole facing the corresponding moving and stationary contact as an S pole. The magnetic field formed by the four magnets 81 and the two yoke clamps 82 can generate a magnetic field as shown in the diagram. Figure 21 The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Since the magnetic blowing force is directed diagonally downward in the same direction, it will not interfere with each other.

[0095] Example 9

[0096] See Figure 22 As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment 1 in that the plurality of magnets 81 are two magnets, which are respectively arranged at both ends of the length of the moving spring 3 at positions corresponding to the moving and stationary contacts, and the magnetic poles of the opposite sides of the two magnets 81 are set to opposite; the two magnets 81 are also connected to two yoke clamps 82, and the two yoke clamps 82 further include at least two yoke segments 821 located on both sides of the width of the moving spring 3 at positions corresponding to the moving and stationary contacts; the two magnets 81 are respectively arranged at positions directly opposite the moving and stationary contacts; as Figure 22As shown, in the two magnets 81, the magnetic pole of the side of the magnet 81 facing the corresponding moving and stationary contact on the left stationary contact 2 side is designated as the N pole, and the magnetic pole of the side of the magnet 81 facing the corresponding moving and stationary contact on the right stationary contact 2 side is designated as the S pole. In this embodiment, both yoke clips 82 are U-shaped, and the bottom wall 822 of the U-shape of the two yoke clips 82 is connected to the opposite side of the two magnets 81, that is, one yoke clip 82 is connected to one magnet 81. The ends of the two side walls 823 of the U-shape of the two yoke clips extend beyond the width of the moving spring 3 to the positions corresponding to the moving and stationary contacts. The two side walls 823 of the U-shape of the two yoke clips 82 contain the yoke segment 821.

[0097] In this embodiment, the magnetic field formed by the cooperation of the two magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 22 The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Since the magnetic blowing force is directed outward at an angle, with one pointing downward and the other upward, they do not interfere with each other.

[0098] The DC relay in this embodiment has no polarity requirement for the load, and its arc extinguishing capabilities are equal in both forward and reverse directions. When connected in reverse, the directions of the two magnetic blow-out forces are both obliquely outward and will not affect each other.

[0099] Example 10

[0100] See Figure 23 As shown, the DC relay based on magnet for arc extinguishing of the present invention differs from Embodiment 9 in that the ends of the two U-shaped side walls 823 of the two yoke clamps 82 respectively constitute corresponding yoke segments 821.

[0101] The magnetic field formed by the combination of two magnets 81 and two yoke clamps 82 can create a magnetic field like... Figure 23 The magnetic blowout force is in the direction indicated by the middle arrow.

[0102] Example 11

[0103] See Figure 24 As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment Nine in that the U-shaped bottom walls 824 of the two yoke clips 82 are respectively adapted to both sides of the width of the moving spring 3, and the ends of the two side walls 825 of the U-shape of the two yoke clips are respectively connected to the opposite sides of the two magnets 81. The yoke segments 821 of the two yoke clips 82, located on both sides of the width of the moving spring 3, corresponding to the positions of the moving and stationary contacts, are provided at the corresponding bottom walls 824 of the U-shape of the yoke clip 82.

[0104] The magnetic field formed by the combination of two magnets 81 and two yoke clamps 82 can create a magnetic field like... Figure 24The magnetic blowout force is in the direction indicated by the middle arrow.

[0105] Example 12

[0106] See Figure 25 As shown, the DC relay for arc extinguishing based on magnets of the present invention differs from Embodiment Six in that the plurality of magnets 81 are two magnets, which are respectively arranged on both sides of the width of the moving spring 3 at positions corresponding to the moving and stationary contacts, and the moving and stationary contacts corresponding to the two magnets 81 are different, that is, one magnet corresponds to the left stationary contact 2 side, and the other magnet 81 corresponds to the right stationary contact 2 side; the two magnets 81 are also respectively connected to a yoke clamp 82, which is L-shaped. One side 821 of the L-shape of the yoke clamp 82 is connected to the side of the corresponding magnet 81 that is away from the moving and stationary contacts, and the other side 822 of the L-shape of the yoke clamp 82 is located outside the two ends corresponding to the length of the moving spring 3; as Figure 25 As shown, in the two magnets 81, the magnetic pole of the side of the magnet 81 facing the corresponding moving and stationary contact on the left stationary contact 2 side is set as N pole, and the magnetic pole of the side of the magnet 81 facing the corresponding moving and stationary contact on the right stationary contact 2 side is also set as N pole, that is, the magnetic poles of the two magnets 81 facing the moving and stationary contact are the same.

[0107] In this embodiment, the magnetic field formed by the cooperation of the two magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 25 The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Since the magnetic blowing force is in the same direction and obliquely upward, it will not interfere with each other.

[0108] The DC relay in this embodiment has no polarity requirement for the load, and its arc extinguishing capabilities are equal in both forward and reverse directions. When connected in reverse, the directions of the two magnetic blow forces are both obliquely downward in the same direction and will not affect each other.

[0109] Example 13

[0110] See Figure 26 As shown, the DC relay based on magnets for arc extinguishing according to the present invention differs from Embodiment Twelve in that, of the two magnets 81, the magnetic pole of the side of the magnet 81 corresponding to the left stationary contact 2 facing the corresponding moving and stationary contact is set as the S pole, and the magnetic pole of the side of the magnet 81 corresponding to the right stationary contact 2 facing the corresponding moving and stationary contact is also set as the S pole.

[0111] In this embodiment, the magnetic field formed by the cooperation of the two magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 26The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Since the magnetic blowing force is oriented diagonally downwards in the same direction, it does not interfere with each other.

[0112] The DC relay in this embodiment has no polarity requirement for the load, and its arc extinguishing capabilities are equal in both forward and reverse directions. When connected in reverse, the two magnetic blow forces are both oriented diagonally upwards in the same direction and will not affect each other.

[0113] Example 14

[0114] See Figure 27 As shown, the DC relay based on magnets for arc extinguishing according to the present invention differs from Embodiment Twelve in that the magnetic poles of the two magnets facing the moving and stationary contacts are set to opposite directions. Specifically, among the two magnets 81, the magnetic pole of the magnet 81 corresponding to the left stationary contact 2 facing the corresponding moving and stationary contact is set to the N pole, and the magnetic pole of the magnet 81 corresponding to the right stationary contact 2 facing the corresponding moving and stationary contact is set to the S pole.

[0115] In this embodiment, the magnetic field formed by the cooperation of the two magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 27 The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Both magnetic blowing forces are directed outwards, with one on the left pointing diagonally upwards and the other on the right pointing diagonally downwards, so they do not interfere with each other.

[0116] The DC relay in this embodiment has a load polarity requirement, and the arc extinguishing capabilities differ greatly between the forward and reverse directions. When connected in reverse, both magnetic blowing forces are directed inward, with one on the left pointing diagonally downward and the other on the right pointing diagonally upward, resulting in some interference between the two magnetic blowing forces.

[0117] Example 15

[0118] See Figure 28 As shown, the DC relay based on magnets for arc extinguishing according to the present invention differs from Embodiment Twelve in that the magnetic poles of the two magnets facing the moving and stationary contacts are set to opposite directions. Specifically, among the two magnets 81, the magnetic pole of the magnet 81 corresponding to the left stationary contact 2 facing the corresponding moving and stationary contact is set to the S pole, and the magnetic pole of the magnet 81 corresponding to the right stationary contact 2 facing the corresponding moving and stationary contact is set to the N pole.

[0119] In this embodiment, the magnetic field formed by the cooperation of the two magnets 81 and the two yoke clamps 82 can generate a magnetic field as follows: Figure 28The magnetic blowing force in the direction indicated by the middle arrow extinguishes the arc of the two pairs of moving and stationary contacts. Both magnetic blowing forces are directed inward, with one on the left pointing diagonally downward and the other on the right pointing diagonally upward, which will cause interference between them.

[0120] The DC relay in this embodiment has a load polarity requirement and a large difference in arc extinguishing capability between the forward and reverse directions. When connected in reverse, both magnetic blowing forces are directed outwards, with one on the left pointing diagonally upwards and the other on the right pointing diagonally downwards, and there is no interference between the two magnetic blowing forces.

[0121] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A DC relay for arc extinguishing based on magnetic steel, comprising a ceramic cover, a static contact, a moving spring, a yoke iron plate, a metal frame, an insulating seat and a plurality of magnetic steels; the ceramic cover is fixed to the metal frame through a metallized layer at the bottom, and the bottom end of the metal frame is fixed to the yoke iron plate; two static contacts are respectively fixed to the top of the ceramic cover and the static contacts arranged at the bottom are accommodated in the cavity of the ceramic cover; the moving spring is a straight sheet type, and the moving contacts arranged at the two ends of the moving spring are respectively matched under the two static contacts in the cavity; the characteristics are: The several magnets are respectively arranged at the side positions of the moving spring corresponding to the moving and static contacts, so as to realize arc extinguishing by utilizing the magnetic field formed by the magnets; the insulating seat is mounted on the yoke iron plate, and a surrounding wall is protruding upward from the edge of the insulating seat, and a support protruding horizontally and surrounding the entire periphery is also provided on the edge of the insulating seat, and the support of the insulating seat is matched under the bottom end of the ceramic cover; a groove surrounding the entire periphery is also provided on the table surface of the support of the insulating seat, and an elastically deformable sealing ring is embedded in the groove, so that when the bottom end surface of the ceramic cover is pressed against the sealing ring, the sealing ring is deformed, and the deformed part of the sealing ring extends respectively along the gap between the inner wall of the ceramic cover and the surrounding wall of the insulating seat and the gap between the bottom end surface of the ceramic cover and the support of the insulating seat, thereby being able to block the metal splashes attached to the inner wall of the ceramic cover due to the arc extinguishing of the magnet and the metal on the bottom end surface of the ceramic cover to form a metal path.

2. The DC relay based on magnetic steel for arc extinguishing according to claim 1, characterized in that: The plurality of magnets are four magnets, which are respectively arranged at positions corresponding to the moving and static contacts on both sides of the width of the moving reed, and the magnetic poles of the two magnets corresponding to the same pair of moving and static contacts facing the moving and static contacts are set to be opposite, while the magnetic poles of the two magnets corresponding to the same side of the width of the moving reed facing the corresponding moving and static contacts are set to be the same, and a yoke clamp is also connected between the two magnets corresponding to the same pair of moving and static contacts; the four magnets are respectively arranged at positions directly opposite to the moving and static contacts.

3. The DC relay based on magnetic steel for arc extinguishing according to claim 2, characterized in that: Among the four magnetic steels, the magnetic poles of the two magnetic steels on the left side corresponding to the current flow direction of the moving spring piece facing the corresponding moving and static contacts are set as N poles.

4. The DC relay based on magnetic steel for arc extinguishing according to claim 1, characterized in that: The plurality of magnets are four magnets, which are respectively arranged at positions corresponding to the moving and static contacts on both sides of the width of the moving reed sheet, and the magnetic poles of the two magnets corresponding to the same pair of moving and static contacts facing the moving and static contacts are set to be the same, and a yoke clamp is also connected between the two magnets corresponding to the same pair of moving and static contacts; the four magnets are respectively arranged at positions directly opposite to the moving and static contacts.

5. The DC relay based on magnetic steel for arc extinguishing according to claim 4, characterized in that: Among the four magnetic steels, the magnetic poles of two magnetic steels corresponding to the same side of the width of the moving spring piece facing the corresponding moving and static contacts are set to be the same.

6. The DC relay based on magnetic steel for arc extinguishing according to claim 4, characterized in that: Among the four magnetic steels, the magnetic poles of two magnetic steels corresponding to the same side of the width of the moving spring piece facing the corresponding moving and static contacts are set to be opposite.

7. The DC relay based on magnetic steel for arc extinguishing according to claim 1, characterized in that: The plurality of magnets are four magnets, which are respectively arranged at positions corresponding to the moving and static contacts on both sides of the width of the moving reed, and the magnetic poles of the two magnets corresponding to the same pair of moving and static contacts facing the moving and static contacts are set to be opposite, and the magnetic poles of the two magnets corresponding to the same side of the width of the moving reed facing the corresponding moving and static contacts are also set to be opposite, and a yoke clamp is also connected between the two magnets corresponding to the same pair of moving and static contacts.

8. The DC relay based on magnetic steel for arc extinguishing according to claim 7, characterized in that: The two magnetic steels corresponding to the same pair of moving and static contacts are arranged at offset positions relative to the same pair of moving and static contacts, and the two magnetic steels are staggeredly distributed.

9. The DC relay based on magnetic steel for arc extinguishing according to claim 1, characterized in that: The plurality of magnets are two magnets, which are respectively arranged at positions corresponding to the moving and static contacts outside the two ends of the length of the moving reed, and the magnetic poles of the opposite sides of the two magnets are set to be opposite; the two magnets are also connected to two yoke clamps, and the two yoke clamps also include at least yoke sections located on both sides of the width of the moving reed corresponding to the positions of the moving and static contacts; the two magnets are respectively arranged at positions directly opposite to the moving and static contacts.

10. The DC relay based on magnetic steel for arc extinguishing according to claim 9, characterized in that: The yoke iron clamps are U-shaped, and the bottom walls of the U shapes of the two yoke iron clamps are respectively connected to the opposite sides of the two magnetic steels, and the ends of the two side walls of the U shapes of the two yoke iron clamps respectively constitute corresponding yoke iron sections.

11. The DC relay based on magnetic steel for arc extinguishing according to claim 9, characterized in that: The yoke clamps are U-shaped, and the bottom walls of the U-shape of the two yoke clamps are respectively connected to the opposite sides of the two magnetic steels. The ends of the two side walls of the U-shape of the two yoke clamps respectively exceed the positions corresponding to the moving and static contacts on both sides of the width of the moving spring sheet; the two side walls of the U-shape of the two yoke clamps contain the yoke section.

12. The DC relay based on magnetic steel for arc extinguishing according to claim 9, characterized in that: The yoke iron clamps are U-shaped, and the bottom walls of the U-shape of the two yoke iron clamps are respectively adapted to the two sides of the width of the movable spring sheet, and the ends of the two side walls of the U-shape of the two yoke iron clamps are respectively connected to the opposite sides of the two magnetic steels.

13. The DC relay based on magnetic steel for arc extinguishing according to claim 1, characterized in that: The plurality of magnetic steels are two magnetic steels, and the two magnetic steels are respectively arranged at positions corresponding to the moving and static contacts on both sides of the width of the moving spring piece, and the moving and static contacts corresponding to the two magnetic steels are different; the two magnetic steels are also respectively connected to a yoke clamp, and the two yoke clamps are L-shaped, one side of the L-shaped yoke clamp is connected to a side of the corresponding magnetic steel facing away from the moving and static contacts, and the other side of the L-shaped yoke clamp is located outside the two ends corresponding to the length of the moving spring piece; the two magnetic steels are respectively arranged at positions directly opposite to the moving and static contacts.

14. The DC relay based on magnetic steel for arc extinguishing according to claim 13, characterized in that: The magnetic poles of the two magnets facing the moving and static contacts are set to be the same.

15. The DC relay based on magnetic steel for arc extinguishing according to claim 13, characterized in that: The magnetic poles of the two magnets facing the moving and static contacts are arranged to be opposite.

16. The DC relay based on magnetic steel for arc extinguishing according to claim 1, characterized in that: The ring length of the sealing ring is slightly smaller than the ring length of the groove of the insulating seat, so that the sealing ring is elastically tensioned in the groove.

17. The DC relay based on magnetic steel for arc extinguishing according to claim 1, characterized in that: The insulating seat also includes a bottom plate, and the surrounding wall is arranged at the edge of the bottom plate, so that an arc extinguishing cavity is surrounded by the surrounding wall and the bottom plate, and the projections of the static contact and the moving spring on the insulating seat are located in the arc extinguishing cavity.

18. The DC relay based on magnetic steel for arc extinguishing according to claim 17, characterized in that: The surrounding wall is in a fully enclosed shape and surrounds the entire periphery of the insulating seat.

19. The DC relay based on magnetic steel for arc extinguishing according to claim 17, characterized in that: The surrounding wall is in a two-section half-enclosed shape, and the two sections of the surrounding wall in the half-enclosed shape are respectively located outside the projection positions corresponding to the two ends of the movable spring piece.

20. The DC relay based on magnetic steel for arc extinguishing according to claim 17, characterized in that: A grid bar structure is also provided in the arc extinguishing cavity to increase the arc extinguishing size and creepage distance.

21. The DC relay based on magnetic steel for arc extinguishing according to claim 20, characterized in that: The grid bar structure in the arc extinguishing cavity includes a first grid bar structure located at the outer edge of the projection position corresponding to the two ends of the moving spring piece, and the height of the first grid bar structure is greater than the height of the surrounding wall.

22. The DC relay based on magnetic steel for arc extinguishing according to claim 21, characterized in that: The top end of the first grid bar structure is close to the edge of the corresponding end of the movable spring piece, and the first grid bar structure is in a half-wrapped shape.

23. The DC relay based on magnetic steel for arc extinguishing according to claim 21, characterized in that: The bar structure in the arc extinguishing cavity further includes a second bar structure between the first bar structure and the surrounding wall. The second bar structure is substantially arranged along the length direction of the movable spring piece. The height of the second bar structure is substantially the same as the height of the surrounding wall.

24. The DC relay based on magnetic steel for arc extinguishing according to claim 21, characterized in that: In the ceramic cover, at the position of the inner wall, limiting ribs are provided on both sides corresponding to the length direction of the movable spring piece, which are used to limit the movable spring piece from deviating to both sides of the width during the up and down movement. The limiting ribs protrude to the edge of the first grid structure to block the arc.

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