A high-voltage DC relay with improved arc extinguishing capability

Abstract

The present invention discloses a high-voltage DC relay with improved arc extinguishing capability, comprising an inner support cover, a movable contact piece, and two static contacts, wherein the two static contacts are arranged on the top of the inner support cover, the movable contact piece is located inside the inner support cover, and its two ends in the length direction respectively correspond to the bottom ends of the two static contacts; two magnetic steel components corresponding to the two static contacts are arranged in the inner support cover, and the two magnetic steel components respectively include a first magnetic steel and a second magnetic steel, the first magnetic steel and the second magnetic steel of each magnetic steel component are respectively located on opposite sides of the corresponding static contact in the length direction of the movable contact piece, and the first magnetic steel is located between the two static contacts; the contact gap between each static contact and the movable contact piece is respectively located between the first magnetic steel and the second magnetic steel of the corresponding magnetic steel component. The present invention increases the magnetic flux density at the contact without increasing the volume of the relay, reduces the distance between the magnetic steel and the contact arc starting point, and improves the arc extinguishing capability.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a high-voltage direct current relay with improved arc extinguishing capability. Background Art

[0002] A high-voltage DC relay is an electromagnetic switch that controls the on-off of high currents by switching low currents. Its working principle is as follows: when the coil of the high-voltage DC relay is energized, the coil generates a magnetic field that drives the moving iron core upward. The moving iron core then pushes the rod component to move the moving contact upward, causing the moving contact to contact the two static contacts to achieve conduction, thereby achieving the purpose of controlling high currents with low currents.

[0003] During operation, high-voltage DC relays experience high voltage, high current, and a lack of zero-crossing in the DC current. When the two static contacts and the moving contact are disconnected under load, the arc is difficult to extinguish on its own. To quickly and reliably interrupt the arc, a transverse magnetic field is typically provided within the arc extinguishing chamber to stretch the arc and rapidly cool it, thereby rapidly extinguishing the arc. This is known as magnetic blowout. Specifically, conventional high-voltage DC relays typically have two magnets arranged within the arc extinguishing chamber, with the two magnets located on either side of the moving contact in the longitudinal direction. However, because the magnets are flat and have a magnetic gap with the circular iron cup, most of the magnetic lines of force are shielded by the iron cup, preventing the 1000V / 300A switching capability from being achieved. One prior art high-voltage DC relay has two magnets on opposite sides of each static contact. However, because one of the magnets is a tile-shaped magnet located outside the arc extinguishing chamber, the distance between the contact and the two magnets is relatively large, resulting in a low magnetic flux density at the contact, limited arc extinguishing capability, and the high cost of using tile-shaped magnets. Summary of the Invention

[0004] The present invention aims to solve the technical problems in the prior art and provides a high-voltage DC relay with improved arc extinguishing capability, which improves the arc extinguishing capability by increasing the magnetic flux density at the contacts.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a high-voltage DC relay with improved arc extinguishing ability, comprising an inner support cover, a moving contact piece and two static contacts, the two static contacts are arranged through the top of the inner support cover, the moving contact piece is located in the inner support cover, and its two ends in the length direction respectively correspond to the bottom ends of the two static contacts; two magnetic steel components corresponding to the two static contacts are arranged in the inner support cover, and the two magnetic steel components respectively include a first magnetic steel and a second magnetic steel, the first magnetic steel and the second magnetic steel of each magnetic steel component are respectively located on the opposite sides of the corresponding static contact in the length direction of the moving contact piece, and the first magnetic steel is located between the two static contacts; the contact gap between each static contact and the moving contact piece is respectively located between the first magnetic steel and the second magnetic steel of the corresponding magnetic steel component.

[0006] Furthermore, the lower portion of the static contact is flat, and its length direction is perpendicular to the length direction of the moving contact piece.

[0007] Furthermore, the first magnetic steel and the second magnetic steel of each magnetic steel component are respectively located below a portion above the lower portion of the corresponding static contact.

[0008] Furthermore, the bottom surface of the static contact is an arc surface that is low in the middle and high at both ends in the width direction of the moving contact piece, or the bottom of the static contact is provided with a first arc blocking protrusion on both sides of its length direction, and the bottom surface of the first arc blocking protrusion and the bottom surface of the static contact form an arc surface that is low in the middle and high at both ends in the width direction of the moving contact piece.

[0009] Furthermore, both ends of the movable contact piece in the length direction are bent upward to form bent portions that are in contact with the static contact.

[0010] Furthermore, arc-striking chamfers are respectively provided at tops of both ends of each bent portion of the movable contact piece in the width direction of the movable contact piece.

[0011] Furthermore, each bent portion of the movable contact piece is provided with a second arc-blocking protrusion on both sides in the width direction of the movable contact piece.

[0012] Furthermore, the N pole of the first magnet and the N pole of the second magnet of each magnetic steel component are both toward one side of the movable contact piece in its length direction, and the S pole of the first magnet and the S pole of the second magnet of each magnetic steel component are both toward the other side of the movable contact piece in its length direction.

[0013] Furthermore, a dimension of the second magnetic steel in the width direction of the movable contact piece is greater than a dimension of the first magnetic steel in the width direction of the movable contact piece.

[0014] Furthermore, the interior of the inner support cover is provided with a plurality of fixed grooves corresponding to the first magnet and the second magnet, and the notches of each fixed groove are respectively facing downward, and the first magnet and the second magnet are respectively embedded in the corresponding fixed grooves, and are limited by the guide plate provided at the bottom of the inner support cover; it also includes a shell part, a coil assembly and a push rod part, and the inner support cover and the coil assembly are distributed in the shell part in the up and down directions, and the moving contact piece is driven by the push rod part, and the push rod part is linked with the moving iron core provided in the coil assembly, and the guide plate provides guidance for the up and down movement of the push rod part.

[0015] Furthermore, the top of the inner support cover is provided with two through holes for passing the two static contacts, and the bottom ends of the parts where the two through holes are located are lower than the rest of the inner top surface of the inner support cover; the top surface of the inner support cover is upwardly extended with two protrusions distributed at intervals along the connecting direction of the two static contacts, and the two through holes are respectively located in the middle of the two protrusions, and the top ends of the parts where the two through holes are located are respectively lower than the top surfaces of the protrusions

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Since the present invention arranges the two magnetic steel components in the inner support cover, and the first magnetic steel and the second magnetic steel of each magnetic steel component are respectively located on opposite sides of the corresponding static contact in the longitudinal direction of the movable contact piece, the contact gap between each static contact and the movable contact piece is respectively located between the first magnetic steel and the second magnetic steel of the corresponding magnetic steel component. As a result, the distance between each group of contacts and the magnetic steels on both sides (i.e., the first magnetic steel / the second magnetic steel) is closer than that in the prior art. Without increasing the volume of the relay, the magnetic flux density at the contact is increased, and at the same time, the distance between the magnetic steel (i.e., the first magnetic steel / the second magnetic steel) and the arc starting point of the contact is reduced, thereby improving the arc extinguishing capability.

[0018] 2. The lower part of the static contact is flat, and its length direction is perpendicular to the length direction of the moving contact piece, so that the size of the lower part of the static contact in the length direction of the moving contact piece is smaller, so that the volume of the magnetic steel component can be made larger, the magnetic field generated is stronger, and the arc extinguishing effect is better. In addition, the two ends of the static contact in the length direction are close to the two ends of the magnetic steel component, respectively. The magnetic steel component can be used to form a constant magnetic field at the end to extinguish the arc, thereby improving the utilization rate of the magnetic steel component and improving the arc extinguishing effect. The lower part of the static contact is flat, which can also increase the distance from the surface of the static contact to the inner support cover, preventing the inner support cover from being burned by the arc. The first magnet and the second magnet of each magnetic steel component are respectively located below the corresponding static contact outside the inner support cover, so that the distance between each group of contacts and the magnets on both sides is smaller, which can further reduce the distance between the magnet (i.e., the first magnet / second magnet) and the arc starting point of the contact, and further improve the arc extinguishing ability. Furthermore, the lengthwise ends of the static contact are located near the ends of the magnetic steel, utilizing the magnets to form a constant magnetic field at these ends for arc extinguishing. This improves magnetic steel utilization and arc extinguishing effectiveness without increasing the size of the magnetic steel to enhance magnetic field strength, thereby facilitating a compact and miniaturized product structure. Furthermore, the proximity of the first magnetic steel to the static contact effectively avoids interference with the high-voltage DC relay's push rod component, preventing it from interfering with its installation and movement.

[0019] 3. The bottom surface of the static contact is an arc-shaped surface, low in the middle and high at both ends along the width of the moving contact. This allows the arc to be pulled away along the arc surface when the static contact and the moving contact are disconnected, resulting in better arc extinguishing. The bottom of the static contact is provided with first arc-blocking protrusions on both sides along its length, preventing splashes or arcs from reaching the space between the static contact and the through-hole in the inner support cover through which the static contact passes, thereby forming a clean zone for contamination.

[0020] 4. The movable contact piece is bent upward at both ends along its length to form a bent portion that contacts and mates with the static contact. This bent portion is positioned higher, thereby increasing the contact gap and allowing it to fully enter the range between the first and second magnetic steels. Furthermore, the upward bends at both ends of the movable contact piece also make way for the first magnetic steel, avoiding interference with the first magnetic steel.

[0021] 5. Each bent portion of the movable contact piece is provided with arc-striking chamfers at the top of both ends in the width direction of the movable contact piece, which can provide a downward pull space for the arc and achieve a better arc extinguishing effect.

[0022] 6. The N pole of the first magnet and the N pole of the second magnet of each magnetic steel component are both toward one side of the movable contact piece in its length direction, and the S pole of the first magnet and the S pole of the second magnet of each magnetic steel component are both toward the other side of the movable contact piece in its length direction, which can make the arc directions of the two groups of contacts opposite, thereby further improving the arc extinguishing effect.

[0023] 7. The dimension of the second magnetic steel in the width direction of the moving contact piece is greater than the dimension of the first magnetic steel in the width direction of the moving contact piece, so that the arc pulling direction is offset toward the second magnetic steel, thereby preventing the arc from striking toward the auxiliary contact of the high-voltage DC relay.

[0024] 8. The top of the inner support cover is provided with two through holes for passing the two static contacts, and the bottom ends of the parts where the two through holes are located are lower than the rest of the inner top surface of the inner support cover to increase the internal space of the inner support cover; the top surface of the inner support cover extends upward with two protrusions distributed at intervals along the connecting direction of the two static contacts, and the two through holes are respectively located in the middle of the two protrusions, and the top ends of the parts where the two through holes are located are respectively lower than the top surfaces of the protrusions. In this way, the amount of glue used to achieve glue packaging in the present invention can be reduced.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the high-voltage DC relay with improved arc extinguishing capability of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2This is a cross-sectional view of the present invention Figure 1 ;

[0028] Figure 3 This is a cross-sectional view of the present invention Figure 2 ;

[0029] Figure 4 This is a schematic diagram of the positional relationship between the two static contacts, the moving contact piece and the two magnetic steel components of the present invention. Figure 1 ;

[0030] Figure 5 This is a schematic diagram of the positional relationship between the two static contacts, the moving contact piece and the two magnetic steel components of the present invention. Figure 2 ;

[0031] Figure 6 A schematic diagram of the three-dimensional structure of the static contact of the present invention;

[0032] Figure 7 It is a schematic diagram of the three-dimensional structure of the movable contact piece of the present invention;

[0033] Figure 8 It is a schematic diagram of the magnetic field direction and arc direction of the present invention;

[0034] Figure 9 This is a schematic diagram of the three-dimensional structure of the inner support cover of the present invention Figure 1 ;

[0035] Figure 10 This is a schematic diagram of the three-dimensional structure of the inner support cover of the present invention Figure 2 ;

[0036] Figure 11 This is a cross-sectional view of the inner support cover of the present invention after installing two magnetic steel components;

[0037] Among them, 1. shell, 2. static contact, 21. lower part of static contact, 211. first arc blocking protrusion, 212. bottom surface, 3. moving contact piece, 31. bending part, 311. arc striking chamfer, 312. second arc blocking protrusion, 4. inner support cover, 41. through hole, 42. fixing groove, 43. protrusion, 5. guide plate, 6. iron cup, 7. push rod component, 8. coil assembly, 9. first magnet, 10. second magnet. DETAILED DESCRIPTION

[0038] See Figures 1-11As shown, a high-voltage DC relay with improved arc extinguishing capability of the present invention includes a shell component, an inner support cover 4, a guide plate 5, two static contacts 2, a moving contact piece 3, a push rod component 7 and a coil assembly 8. The shell component specifically includes an outer shell 1 and an iron cup 6. The iron cup 6 is located in the outer shell 1. The inner support cover 4 and the coil assembly 8 are distributed in the iron cup 6 of the shell component in the up and down directions. Moreover, the inner support cover 4 is interference fit with the iron cup 6 in the upper part of the iron cup 6. The two static contacts 2 are respectively inserted into two through holes 41 provided at the top of the inner support cover 4. The moving contact piece 3 is located in the inner support cover 4 and is driven by the push rod component 7 so that its two ends in the length direction are respectively in contact with or separated from the bottom ends of the two static contacts; the guide plate 5 is fixed to the bottom of the inner support cover 4 and provides guidance for the up and down movement of the push rod component 7. In the present invention, two magnetic steel components corresponding to the two static contacts 2 are arranged in the inner support cover 4, and the two magnetic steel components respectively include a first magnetic steel 9 and a second magnetic steel 10. The first magnetic steel 9 and the second magnetic steel 10 of each magnetic steel component are respectively located on the opposite sides of the corresponding static contact 2 in the length direction of the movable contact piece 3, and the first magnetic steel 9 is located between the two static contacts 2; the contact gap between each static contact 2 and the movable contact piece 3 is respectively located between the first magnetic steel 9 and the second magnetic steel 10 of the corresponding magnetic steel component.

[0039] In this embodiment, Figure 4-Figure 6 As shown, the lower portion 21 of the static contact is flat, with its length perpendicular to the length of the movable contact piece 3. The first magnetic steel 9 and second magnetic steel 10 of each magnetic steel component are respectively located below the portion above the lower portion 21 of the corresponding static contact. The portion of the static contact 2 that passes downward through the through hole 41 of the inner support cover 2 and enters the inner support cover 2 is defined as the lower portion 21 of the static contact, while the portion above the lower portion 21 of the static contact refers to the portion of the static contact 2 located outside the inner support cover 2. This not only reduces the material used for the static contact 2, but also significantly reduces the space occupied by the lower portion 21 of the static contact within the inner support cover 2, thereby making room for the first magnetic steel 9 and the second magnetic steel 10 within the inner support cover 2. This also reduces the distance between the first magnetic steel 9 and the second magnetic steel 10 and the static contact 2. This further increases the magnetic flux density at the contact point without increasing the relay size. At the same time, it brings the contact arc starting point closer to the first magnetic steel 9 and the second magnetic steel 10, making the magnetic field intensity at the arc starting point stronger and improving the arc extinguishing effect.

[0040] In this embodiment, Figure 6As shown, the bottom of the static contact 21 is provided with first arc-blocking protrusions 211 on both sides of its longitudinal direction. The first arc-blocking protrusions 211 can prevent the arc generated by the disconnection between the static contact 2 and the movable contact piece 3 from splashing upward, so that the arc burns as far as possible below the bottom of the static contact 2, preventing the arc from splashing upward, thereby increasing the creepage distance and improving the insulation. The bottom surface of the first arc-blocking protrusion 211 and the bottom surface 212 of the static contact together form an arc surface with a low center and high ends in the width direction of the movable contact piece 3. When the static contact 2 and the movable contact piece 3 disconnect, the arc generated can be pulled apart along the arc surface, achieving a better arc extinguishing effect. Since the bottom surface of the first arc-blocking protrusion 211 and the bottom surface 212 of the static contact are both arc surfaces, and the bottom surface of the first arc-blocking protrusion 211 and the bottom surface 212 of the static contact are concentric and have the same radial dimensions, it is possible not only to avoid the bottom surface of the first arc-blocking protrusion 211 affecting the arc-pulling effect of the bottom surface 212 of the static contact, but also to increase the arc-pulling length of the bottom surface 212 of the static contact, thereby improving the arc extinguishing effect of the present invention.

[0041] In this embodiment, Figure 7 As shown, the movable contact piece 3 is bent upward at both ends along its length to form a bent portion 31 that contacts and mates with the stationary contact 2. This position of the bent portion 31 is elevated, thereby raising the contact gap between the bent portion 31 and the stationary contact 2 and allowing it to fully enter the range between the first magnetic steel 9 and the second magnetic steel 10. Furthermore, the upward bends at both ends of the movable contact piece 3 create a space inside the bent portion 31, making way for the first magnetic steel 9 and avoiding interference with the first magnetic steel 9. Arc-strike chamfers 311 are provided at the top of each of the bent portions 31 along its width, allowing the arc to be drawn along the contact surface when the contacts are opened. Specifically, the upward bends at both ends of the movable contact piece 3 increase the contact gap and the height distance between the movable contact piece 3 and the guide plate 5. The arc-strike chamfers 311 facilitate the arc to be drawn toward the guide plate 5, facilitating rapid arc breaking.

[0042] In this embodiment, Figure 7 As shown, each bending portion 31 of the moving contact piece 3 is provided with a second arc blocking protrusion 312 at the end surface at both ends of the moving contact piece 3 in the width direction. The second arc blocking protrusion 312 forms a blocking step at both ends of the moving contact piece 3 in the width direction to prevent the arc from directly hitting the bottom.

[0043] In this embodiment, the number of the first magnetic steel 9 and the second magnetic steel 10 of each magnetic steel component is one, but it is not limited to this. In other embodiments, the number of the first magnetic steel 9 and the second magnetic steel 10 of each magnetic steel component is also two, three, etc. The north pole of the first magnetic steel 9 and the second magnetic steel 10 of each magnetic steel component are both oriented to one side of the movable contact piece 3 in its length direction, and the south pole of the first magnetic steel 9 and the second magnetic steel 10 of each magnetic steel component are both oriented to the other side of the movable contact piece 3 in its length direction. In this way, the arc directions of the two sets of contacts can be made opposite, such as Figure 8 As shown in the figure, the horizontal arrow indicates the direction of the magnetic field, and the vertical arrow indicates the direction of the arc.

[0044] In this embodiment, Figure 8 As shown, the first magnetic steel 9 and the second magnetic steel 10 are both flat-plate shaped, and the dimension of the second magnetic steel 10 in the width direction of the movable contact piece 3 (i.e., the length of the second magnetic steel 10) is greater than the dimension of the first magnetic steel 9 in the width direction of the movable contact piece 3 (i.e., the length of the first magnetic steel 9). In this way, the arc drawing direction is offset toward the direction of the second magnetic steel 10, thereby preventing the arc from striking in the direction of the auxiliary contact of the high-voltage DC relay. This is because an auxiliary contact chamber is provided on one side of the movable contact piece 4 in the width direction of the inner support cover 4. After the arc drawing direction is offset toward the direction of the second magnetic steel 10, the arc can be prevented from deviating in the direction of the auxiliary contact chamber.

[0045] In this embodiment, the bottom ends of the two through holes 41 are lower than the rest of the inner top surface of the inner support cover 4 to increase the internal space of the inner support cover, provide sufficient space for the two ends of the moving contact piece 3 to bend upward, and ensure the contact gap. The top surface of the inner support cover 4 extends upward to have two protrusions 43 spaced apart along the connecting line of the two static contacts 4. The two through holes 41 are respectively located in the middle of the two protrusions 43, and the top ends of the two through holes 41 are respectively lower than the top surfaces of the protrusions 43. Figure 9 In this way, the amount of glue used to achieve glue packaging in the present invention can be reduced.

[0046] In this embodiment, Figure 10 、 Figure 11 As shown, the inner support cover 4 is provided with a plurality of fixing slots 42 corresponding to the first and second magnetic steels 9 and 10, with the notches of each fixing slot 42 facing downward. The first and second magnetic steels 9 and 10 are respectively embedded in the corresponding fixing slots 42 and restrained by the guide plate 5. The fixing slots 42 have a square cross-section, matching the flat-plate design of the first and second magnetic steels 9 and 10. This avoids the need for tile-shaped magnetic designs, simplifies the magnetic steel manufacturing process, and reduces costs.

[0047] The present invention provides a high-voltage DC relay with improved arc extinguishing capability. Since the first magnetic steel 9 and the second magnetic steel 10 of each magnetic steel component are respectively arranged in the arc extinguishing chamber, and the distance between each set of contacts and the magnetic steels on both sides (i.e., the first magnetic steel 9 and the second magnetic steel 10) is very close, the magnetic flux density at the contacts is increased without increasing the volume of the relay. At the same time, the distance between the magnetic steel (i.e., the first magnetic steel 9 / the second magnetic steel 10) and the arc starting point of the contact is very small, the magnetic field intensity at the arc starting point is strong, and the arc generated under the load conditions of 300A and 1000V can be quickly extinguished.

[0048] The present invention provides a high-voltage DC relay with improved arc extinguishing capability, and the unrelated parts are the same as those in the prior art or can be implemented by using the prior art.

[0049] The above embodiments are only used to further illustrate a high-voltage DC relay with improved arc extinguishing capability according to the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-voltage DC relay with improved arc extinguishing capability, comprising an inner support cover, a movable contact, and two stationary contacts, wherein the two stationary contacts are disposed through the top of the inner support cover, and the movable contact is located within the inner support cover, with its ends in the longitudinal direction corresponding to the bottom ends of the two stationary contacts; characterized in that: Two magnetic steel components corresponding to the two static contacts are provided in the inner support cover, and the two magnetic steel components respectively include a first magnetic steel and a second magnetic steel. The first magnetic steel and the second magnetic steel of each magnetic steel component are respectively located on opposite sides of the corresponding static contact in the length direction of the movable contact piece, and the first magnetic steel is located between the two static contacts; the contact gap between each static contact and the movable contact piece is respectively located between the first magnetic steel and the second magnetic steel of the corresponding magnetic steel component; The two ends of the movable contact piece in the length direction are respectively bent upward to form a bent portion that contacts and cooperates with the static contact, and each bent portion of the movable contact piece is respectively extended with an arc-blocking convex portion on both sides in the width direction of the movable contact piece, and the top surface of each bent portion of the movable contact piece is respectively provided with an arc-striking chamfer at both ends in the width direction of the movable contact piece, and the arc-striking chamfer is partially formed on the arc-blocking convex portion to provide a downward pull-down space for the arc.

2. The high-voltage DC relay with improved arc extinguishing capability according to claim 1, characterized in that: The lower portion of the static contact is flat, and the length direction thereof is perpendicular to the length direction of the moving contact piece.

3. The high-voltage DC relay with improved arc extinguishing capability according to claim 2, characterized in that: The first magnetic steel and the second magnetic steel of each magnetic steel component are respectively located below a portion above the lower portion of the corresponding static contact.

4. The high-voltage DC relay with improved arc extinguishing capability according to claim 2, characterized in that: The bottom surface of the static contact is an arc surface that is low in the middle and high at both ends in the width direction of the moving contact piece, or the bottom of the static contact is provided with a first arc-blocking protrusion on both sides in its length direction, and the bottom surface of the first arc-blocking protrusion and the bottom surface of the static contact form an arc surface that is low in the middle and high at both ends in the width direction of the moving contact piece; the arc-blocking protrusion on the moving contact piece is a second arc-blocking protrusion.

5. The high-voltage DC relay with improved arc extinguishing capability according to claim 1, characterized in that: The N pole of the first magnet and the N pole of the second magnet of each magnetic steel component are both toward one side of the movable contact piece in its length direction, and the S pole of the first magnet and the S pole of the second magnet of each magnetic steel component are both toward the other side of the movable contact piece in its length direction.

6. The high-voltage DC relay with improved arc extinguishing capability according to claim 1, characterized in that: A dimension of the second magnetic steel in a width direction of the movable contact piece is greater than a dimension of the first magnetic steel in the width direction of the movable contact piece.

7. The high-voltage DC relay with improved arc extinguishing capability according to claim 1, characterized in that: The interior of the inner support cover is provided with a plurality of fixed grooves corresponding to the first magnet and the second magnet, and the notches of each fixed groove are respectively facing downward, and the first magnet and the second magnet are respectively embedded in the corresponding fixed grooves, and are limited by the guide plate provided at the bottom of the inner support cover; it also includes a shell part, a coil assembly and a push rod part, and the inner support cover and the coil assembly are distributed in the shell part in the up and down directions, and the moving contact piece is driven by the push rod part, and the push rod part is linked with the moving iron core provided in the coil assembly, and the guide plate provides guidance for the up and down movement of the push rod part.

8. The high-voltage DC relay with improved arc extinguishing capability according to claim 1, characterized in that: The top of the inner support cover is provided with two through holes for passing the two static contacts, and the bottom ends of the parts where the two through holes are located are lower than the rest of the inner top surface of the inner support cover; the top surface of the inner support cover is upwardly extended with two protrusions distributed at intervals along the direction of the connection line of the two static contacts, and the two through holes are respectively located in the middle of the two protrusions, and the top ends of the parts where the two through holes are located are respectively lower than the top surfaces of the protrusions.

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