A high-voltage direct-current relay

Abstract

The utility model discloses a kind of high-voltage direct-current relays, comprising: fixed base, movable contact plate, push rod assembly, electromagnetic assembly, upper magnetic sheet and lower magnetic sheet, fixed base includes arc-extinguishing chamber, several permanent magnets are arranged in the circumferential direction of arc-extinguishing chamber, two static contacts of interval arrangement are arranged in arc-extinguishing chamber, two movable contacts are arranged on movable contact plate, movable contact plate is arranged at the output end of push rod assembly, electromagnetic assembly is used to drive push rod assembly to slide, upper magnetic sheet and lower magnetic sheet are respectively arranged on the upper and lower sides of movable contact plate, upper magnetic sheet is located between two static contacts, and at least the surface of upper magnetic sheet towards two static contacts is provided with insulating layer. The high-voltage direct-current relay has the ability of limit breaking and anti-short circuit, and the limit breaking performance is better than prior art, which can effectively improve the electrical life of high-voltage direct-current relay.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, specifically to a high-voltage DC relay. Background Technology

[0002] The electrical performance of a relay mainly includes its electrical life, breaking capacity, and short-circuit withstand capability. In existing high-voltage DC relays, to improve their breaking capacity and short-circuit withstand capability, Chinese patent CN202111486449X discloses a relay in which a permanent magnet is arranged circumferentially in the arc-extinguishing chamber to form an arc-blowing magnetic field. Under the action of this field, the arc generated at the moment the moving and stationary contacts open will shift, making the arc between the moving and stationary contacts longer and thus easier to extinguish. In addition, a first magnetic plate and a second magnetic plate are arranged on the upper and lower sides of the moving contact plate. Both the first and second magnetic plates are made of metal and can be magnetized by the current passing through the moving contact plate, forming a closed magnetic circuit. Therefore, when the current passes through the moving contact plate, there is an electromagnetic attraction between the first and second magnetic plates to counteract part of the electrodynamic repulsion generated by the large current flowing through the stationary contact and the moving contact of the moving contact plate, preventing the moving and stationary contacts from springing apart, improving short-circuit withstand capability, and enhancing the stability of the moving and stationary contact.

[0003] Under current industry-standard electrical performance conditions, the above-mentioned relay structure can meet the design requirements. However, as electrical performance requirements become increasingly stringent, especially when applied to large loads such as currents of around 2500A, existing relay structures frequently fail or explode. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides a high-voltage DC relay that has both ultimate breaking capacity and short-circuit withstand capability, and its ultimate breaking capacity is better than that of the prior art, which can effectively improve the electrical life of the high-voltage DC relay.

[0005] To achieve the above objectives, this utility model discloses a high-voltage DC relay, comprising:

[0006] A fixed base includes an arc-extinguishing chamber, in which several permanent magnets are arranged circumferentially, and two stationary contacts are arranged at intervals inside the arc-extinguishing chamber.

[0007] The moving contact plate is located in the arc-extinguishing chamber, and the moving contact plate is provided with two moving contacts, each of which corresponds to and cooperates with a stationary contact.

[0008] The push rod assembly slides relative to the fixed base, and the movable contact plate is located at the output end of the push rod assembly;

[0009] Electromagnetic components, used to drive the sliding of the push rod assembly;

[0010] The upper magnetic sheet and the lower magnetic sheet are provided. The upper magnetic sheet is located on the upper side of the moving contact plate facing the stationary contact, and the lower magnetic sheet is located on the lower side of the moving contact plate facing away from the stationary contact. The upper magnetic sheet is located between the two stationary contacts, and at least the surface of the upper magnetic sheet facing the two stationary contacts is provided with an insulating layer.

[0011] As an optional implementation, an insulating layer is provided on the surface of both the upper and lower magnetic sheets; or an insulating layer is provided on the surface of both the upper and lower magnetic sheets.

[0012] As an optional implementation, the insulation performance of the insulation layer is sufficient to allow the high-voltage DC relay to disconnect normally under a current of 2500A.

[0013] As an alternative implementation, the insulating layer is formed by spraying insulating material, oxidizing, or applying insulating tape.

[0014] As an optional implementation, the upper magnetic sheet is fixed relative to the arc-extinguishing chamber, and the lower magnetic sheet moves together with the moving contact plate, so that when the moving and stationary contacts are in contact, the lower magnetic sheet and the upper magnetic sheet are magnetized by the current passing through the moving contact plate and form a closed magnetic circuit, and when the moving and stationary contacts are disconnected, the lower magnetic sheet and the upper magnetic sheet separate.

[0015] As an optional implementation, the upper magnetic sheet has two opposite sides facing the two stationary contacts recessed inward to form a relief groove, which keeps the upper magnetic sheet and the stationary contacts within a preset distance range.

[0016] As an optional implementation, the upper magnetic sheet has a through hole in the middle to avoid the push rod assembly.

[0017] As an alternative implementation, at least some of the edges of the upper magnetic sheet are provided with rounded corners to enhance the adhesion of the insulating layer.

[0018] As an optional implementation, it also includes an arc-extinguishing insulating seat, which is disposed at the bottom of the arc-extinguishing chamber. The push rod assembly passes through the arc-extinguishing insulating seat to extend into the arc-extinguishing chamber, and a stop arm extends from the arc-extinguishing insulating seat to press the upper magnetic sheet against the top of the arc-extinguishing chamber.

[0019] As an optional implementation, a buffer pad is laid between the upper magnetic sheet and the top of the arc-extinguishing chamber.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention relates to a high-voltage DC relay. By incorporating a permanent magnet and two magnetic sheets, the high-voltage DC relay simultaneously possesses the capabilities of ultimate breaking capacity and short-circuit withstand. Furthermore, by applying surface insulation treatment to the magnetic sheets, the large electric arc generated when the contacts open under heavy loads will not penetrate the magnetic sheets and conduct through the two stationary contacts, allowing the arc to extinguish rapidly. Its ultimate breaking performance is superior to existing technologies, effectively improving the electrical life of the high-voltage DC relay and meeting the application requirements of heavy loads. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is one of the cross-sectional schematic diagrams of the high-voltage DC relay according to an embodiment of the present utility model.

[0024] Figure 2 for Figure 1 The image shown is a partial enlarged view of section A, which includes a schematic diagram of a single-sided electric arc path.

[0025] Figure 3 This is a second cross-sectional schematic diagram of the high-voltage DC relay according to an embodiment of the present utility model.

[0026] Figure 4 This is a schematic diagram showing the connection of some parts in the high-voltage DC relay of this utility model embodiment.

[0027] Figure 5 for Figure 4 A cross-sectional view of the structure shown.

[0028] Figure 6 This is a partial cross-sectional view of the upper magnetic conductive sheet according to an embodiment of the present invention.

[0029] in:

[0030] 1. Fixed base; 11. Arc extinguishing chamber; 12. Permanent magnet; 2. Static contact; 3. Moving contact plate; 31. Moving contact; 4. Push rod assembly; 41. First rod body; 42. Second rod body; 421. Stepped part; 43. Support sleeve; 44. Limiting component; 45. Pressure spring; 46. Return spring; 5. Electromagnetic assembly; 51. Yoke; 52. Coil; 53. Coil bracket; 54. Moving iron core; 55. Fixed iron core; 6. Upper magnetic guide plate; 61. Insulation layer; 62. Clearance groove; 63. Through hole; 64. Rounded corner; 7. Lower magnetic guide plate; 8. Arc extinguishing insulation seat; 81. Abutment arm; 9. Buffer pad. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0035] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0036] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0037] Combination Figures 1 to 6 In this embodiment, the high-voltage DC relay includes a fixed base 1, a stationary contact 2, a moving contact plate 3, a push rod assembly 4, an electromagnetic assembly 5, an upper magnetic sheet 6, a lower magnetic sheet 7, an arc-extinguishing insulating base 8, and a buffer pad 9.

[0038] The fixed base 1 includes an arc-extinguishing chamber 11, which may be specifically formed by a ceramic cover. There are two stationary contacts 2, which are arranged at intervals inside the arc-extinguishing chamber 11 and are specifically fixed to the top of the arc-extinguishing chamber 11. A number of permanent magnets 12 are also arranged around the arc-extinguishing chamber 11. Preferably, there are two permanent magnets 12. The arrangement direction of the two permanent magnets 12 is the same as the arrangement direction of the two stationary contacts 2, and the two stationary contacts 2 are located between the two permanent magnets 12.

[0039] The electromagnetic component 5 is mounted on the fixed base 1 and located below the arc-extinguishing chamber 11. The electromagnetic component 5 drives the push rod assembly 4 to slide relative to the fixed base 1. The driving end of the push rod assembly 4 is connected to the electromagnetic component 5, and the output end of the push rod assembly 4 extends into the arc-extinguishing chamber 11. The moving contact plate 3 is located inside the arc-extinguishing chamber and is mounted on the output end of the push rod assembly 4. The moving contact plate 3 is provided with two moving contacts 31. Each moving contact 31 is respectively matched with a stationary contact 2, so that when the electromagnetic component 5 drives the push rod assembly 4 to slide, the push rod assembly 4 drives the moving contact plate 3 to move toward the stationary contact 2, so that the moving contact 31 and the stationary contact 2 make contact and conduct.

[0040] The upper magnetic sheet 6 is disposed on the upper side of the moving contact plate 3 facing the stationary contact 2, and the upper magnetic sheet 6 is located between the two stationary contacts 2. Preferably, the upper magnetic sheet 6 is fixed relative to the arc-extinguishing chamber 11. Specifically, the positioning of the upper magnetic sheet 6 can be achieved by the arc-extinguishing insulating seat 8 disposed at the bottom of the arc-extinguishing chamber 11. The lower magnetic sheet 7 is disposed on the lower side of the moving contact plate 3 facing away from the stationary contact 2. Preferably, the lower magnetic sheet 7 moves together with the moving contact plate 3, so that when the moving and stationary contacts are in contact, the lower magnetic sheet 7 and the upper magnetic sheet 6 are magnetized by the current passing through the moving contact plate 3 and form a closed magnetic circuit, and when the moving and stationary contacts are disconnected, the lower magnetic sheet 7 and the upper magnetic sheet 6 are separated.

[0041] In this embodiment, it is also preferred that an insulating layer 61 is provided on the surface of both the upper magnetic sheet 6 and the lower magnetic sheet 7.

[0042] In existing technologies, high-voltage DC relays are used in new energy vehicles. Short-circuit protection in new energy vehicles generally includes two methods: for short circuits in electrical equipment such as the vehicle's air conditioning system, protection is provided by the active disconnection of the high-voltage DC relay (ultimate breaking capacity). Because the power of electrical equipment in previous vehicles was relatively low and the wires were thin, even if a short circuit occurred, the resulting current was generally less than 2000A. For short circuits in the battery pack, protection is provided by the blowing of fuses, in which case the high-voltage DC relay needs to remain conductive (short-circuit withstand capability). With the development of new energy vehicles, the power of installed electrical equipment is increasing, causing the current generated during a short circuit to exceed the ultimate breaking capacity of existing high-voltage DC relays. The arc generated by the instantaneous disconnection of the moving and stationary contacts cannot be sustained for a long time, causing a sudden increase in internal heat in the high-voltage DC relay, gas expansion, and ultimately, an explosion.

[0043] Conventional solutions include increasing the arc-blowing magnetic field strength of the permanent magnet 12, increasing the opening distance between the moving and stationary contacts, and increasing the spacing between the two stationary contacts 2 to address the problem of failure and explosion under heavy loads. However, this would increase the product size, making it unsuitable for installation and use in the confined space inside a car.

[0044] Therefore, the applicant hoped to discover the root cause of the failure and explosion problem through laboratory testing. In a specially designed multi-level load experiment, the applicant accidentally discovered that the magnetic sheet exhibited ablation. Through further experimental analysis, the applicant found that when the current under a large load reached approximately 2500A, multiple arcs were generated between the moving and stationary contacts at the moment of disconnection. Most of these arcs, under the influence of the arc-blowing magnetic field generated by the permanent magnet 12, passed along the inner wall of the arc-extinguishing chamber 11, greatly lengthening the path of the outer arc. The outer arc is easily extinguished; however, the inner arc, due to the fact that the existing magnetic sheet is made of metal and generally only has anti-rust properties (such as nickel plating, blackening, etc.), and that the magnetic sheet is not completely demagnetized at the moment the moving and stationary contacts are disconnected, attracts the inner arc. This prevents the arc from being completely blown towards the inner wall of the arc-extinguishing chamber 11 by the arc-blowing magnetic field. The inner arc breaks through the magnetic sheet, causing a short circuit between the two stationary contacts 2. The arc cannot be broken for a long time, resulting in failure and explosion.

[0045] Based on experimental findings, the applicant proposed the new high-voltage DC relay as described above. By insulating the magnetic sheet, due to the presence of the insulation layer 61, the inner arc cannot pass through the magnetic sheet but instead creeps across its surface, lengthening the arc's path and making it easier to extinguish. Figure 2The current path diagram shows that this significantly improves the overall breaking capacity of the high-voltage DC relay, effectively extending its electrical life and allowing for better control over its size. Comparative experiments between the new and old solutions revealed that the improved high-voltage DC relay, requiring only insulation of the magnetic strip, can normally disconnect under a large load current of 2500A without failure or explosion.

[0046] Thus, the high-voltage DC relay of this application has both ultimate breaking capacity and short-circuit withstand capability, and its ultimate breaking capacity performance is better than that of the prior art, which can effectively improve the electrical life of the high-voltage DC relay, and without increasing the overall size, the cost can be controlled within a small fluctuation range.

[0047] See Figures 3 to 5 To fix the upper magnetic sheet 6, in this embodiment, the push rod assembly 4 passes through the arc-extinguishing insulating seat 8 and extends into the arc-extinguishing chamber 11. An abutment arm 81 extends from the arc-extinguishing insulating seat 8. Two abutment arms 81 can be specifically provided, arranged opposite each other to press the upper magnetic sheet 6 against the top of the arc-extinguishing chamber 11. The upper magnetic sheet 6 is positioned using the arc-extinguishing insulating seat 8, resulting in a simple structure and low cost. Additionally, a buffer pad 9 is laid between the upper magnetic sheet 6 and the top of the arc-extinguishing chamber 11, further stabilizing the positioning of the upper magnetic sheet 6.

[0048] See Figure 1 , Figure 3 and Figure 5 In this embodiment, based on the principle of full disclosure, the possible solutions for the electromagnetic component 5 and the push rod component 4 are as follows:

[0049] Electromagnetic component 5 includes: coil support 53, coil 52, fixed iron core 55, yoke 51, and moving iron core 54. The fixed iron core 55 and yoke 51 are both fixed to the coil support 53. The coil support 53 is fixed to the fixed base 1, or the yoke 51 is fixed to the fixed base 1. The coil 52 is wound around the coil support 53, and the moving iron core 54 slides within the coil support 53. Push rod assembly 4 includes a first rod body 41, a second rod body 42, a support sleeve 43, a limiting member 44, a pressure spring 45, and a return spring 46. The second rod body 42 is sleeved outside the first rod body 41. The first rod body 41 is made of metal, and the second rod body 42 is made of insulating plastic. The upper end of the second rod body 42 has a stepped portion 421. The lower end is fixedly connected to the moving iron core 54. The return spring 46 is sleeved on the second rod body 42 and located between the moving iron core 54 and the fixed iron core 55. The step portion 421 is located above the fixed iron core 55. The step portion 421 can abut against the fixed iron core 55 for limiting. The moving contact plate 3, the lower magnetic sheet 7, the pressure spring 45, and the support sleeve 43 are sequentially sleeved on the first rod body 41 from top to bottom. The limiting member 44 is connected to the upper end of the first rod body 41 to limit the moving contact plate 3 from detaching from the first rod body 41. The lower surface of the support sleeve 43 abuts against the step portion 421. The upper surface of the support sleeve 43 abuts against the lower end of the pressure spring 45. The lower surface of the lower magnetic sheet 7 abuts against the upper end of the pressure spring 45. The moving contact plate 3 abuts against the lower magnetic sheet 7. When the coil 52 is energized, the yoke 51 and the fixed iron core 55 generate magnetic flux, and the magnetic flux tends to form a closed magnetic circuit, driving the moving iron core 54 to move closer to the fixed iron core 55, thereby driving the push rod assembly 4 to slide upward, and the pressure spring 45 can generate contact pressure under overtravel action.

[0050] See Figure 6 In this embodiment, the upper magnetic sheet 6 is provided with a clearance groove 62, a through hole 63, and a rounded corner 64. Since the upper magnetic sheet 6 is located between two stationary contacts 2, two clearance grooves 62 are provided. The two clearance grooves 62 are formed by indentation from two opposite sides of the upper magnetic sheet 6 facing the two stationary contacts 2. The clearance grooves 62 can increase the gap between the upper magnetic sheet 6 and the stationary contacts 2. The through hole 63 penetrates the middle of the upper magnetic sheet 6. The position of the through hole 63 corresponds to the push rod assembly 4. Specifically, the position of the through hole 63 corresponds to the upper end position of the first rod body 41. The diameter of the through hole 63 is larger than the diameter of the first rod body 41, thereby forming clearance and avoiding interference between the push rod assembly 4 and the upper magnetic sheet 6 when it slides upward. The rounded corner 64 is arranged on some edges of the upper magnetic sheet 6. Specifically, it can be on the four vertical edges of the upper magnetic sheet 6. While not affecting the contact effect between the upper magnetic sheet 6 and the lower magnetic sheet 7, it also helps to enhance the adhesion of the insulating layer 61.

[0051] The insulating layer 61 can be formed by spraying insulating material, oxidation, or applying insulating tape; among them, the sprayed insulating material is preferably Teflon, which can reduce the friction between the lower magnetic sheet 7 and the push rod by utilizing its self-lubricating properties.

[0052] It is understandable that the ability of the magnetic sheet to withstand electric arc levels can be adjusted by controlling the thickness and material of the insulating layer 61. Preferably, the thickness of the insulating layer 61 is greater than or equal to 0.2 mm. Of course, the thickness of the insulating layer 61 can also be other values, and the thickness of the insulating layer 61 can be made thinner while maintaining a certain gap between the magnetic sheet and the stationary contact 2.

[0053] In addition, regarding the shapes of the upper magnetic sheet 6 and the lower magnetic sheet 7, in this embodiment, the upper magnetic sheet 6 is plate-shaped and the lower magnetic sheet 7 is U-shaped. The upper end surfaces of the two vertical sides of the lower magnetic sheet 7 are in contact with the lower surface of the upper magnetic sheet 6 to form a closed magnetic circuit.

[0054] Of course, in other preferred embodiments, the upper magnetic sheet 6 may be in an inverted U shape and the lower magnetic sheet 7 may be in a U shape; or the upper magnetic sheet 6 may be in an inverted U shape and the lower magnetic sheet 7 may be plate-shaped; or both the upper magnetic sheet 6 and the lower magnetic sheet 7 may be in an L shape. The specific shapes of the upper magnetic sheet 6 and the lower magnetic sheet 7 are not limited here.

[0055] In some other preferred embodiments, such as when the moving and stationary contacts are disconnected, the upper surface of the lower magnetic sheet 7 is moved downward away from the lower surface of the stationary contact 2. For example, the upper magnetic sheet 6 is inverted U-shaped and the lower magnetic sheet 7 is plate-shaped. In this case, the insulating layer 61 can be provided only on the surface of the upper magnetic sheet 6, and the insulating layer 61 does not need to be provided on the surface of the lower magnetic sheet 7.

[0056] In some other preferred embodiments, an insulating layer 61 may be provided only on the surface of the upper magnetic sheet 6 facing the two stationary contacts 2, so as to ensure that the electric arc when the moving and stationary contacts are disconnected cannot penetrate the magnetic sheet 6.

[0057] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A high-voltage DC relay, characterized in that, include: A fixed base includes an arc-extinguishing chamber, in which a plurality of permanent magnets are arranged circumferentially, and two stationary contacts are arranged at intervals within the arc-extinguishing chamber. A movable contact plate is located in the arc-extinguishing chamber, and the movable contact plate is provided with two movable contacts, each of which corresponds to and cooperates with a stationary contact. A push rod assembly that slides relative to the fixed base, and a movable contact plate is disposed at the output end of the push rod assembly; An electromagnetic component for driving the push rod assembly to slide; An upper magnetic conductive sheet and a lower magnetic conductive sheet are provided. The upper magnetic conductive sheet is disposed on the upper side of the moving contact plate facing the stationary contact, and the lower magnetic conductive sheet is disposed on the lower side of the moving contact plate facing away from the stationary contact. The upper magnetic conductive sheet is located between the two stationary contacts, and at least the surface of the upper magnetic conductive sheet facing the two stationary contacts is provided with an insulating layer.

2. The high-voltage DC relay according to claim 1, characterized in that, The surface of the upper magnetic sheet is provided with an insulating layer; or the surface of both the upper magnetic sheet and the lower magnetic sheet is provided with an insulating layer.

3. The high-voltage DC relay according to claim 1, characterized in that, The insulation performance of the insulation layer is sufficient to allow the high-voltage DC relay to disconnect normally under a current of 2500A.

4. The high-voltage DC relay according to any one of claims 1 to 3, characterized in that, The insulating layer is formed by spraying insulating material, oxidation, or applying insulating tape.

5. The high-voltage DC relay according to any one of claims 1 to 3, characterized in that, The upper magnetic sheet is fixed relative to the arc-extinguishing chamber, and the lower magnetic sheet moves together with the moving contact plate, so that when the moving and stationary contacts are in contact, the lower magnetic sheet and the upper magnetic sheet are magnetized by the current passing through the moving contact plate and form a closed magnetic circuit, and when the moving and stationary contacts are disconnected, the lower magnetic sheet and the upper magnetic sheet separate.

6. The high-voltage DC relay according to claim 5, characterized in that, The upper magnetic sheet has inward recesses on two opposite sides facing the two stationary contacts to form clearance grooves, which keep the upper magnetic sheet and the stationary contacts within a preset distance range.

7. The high-voltage DC relay according to claim 5, characterized in that, The upper magnetic sheet has a through hole in the middle to avoid the push rod assembly.

8. The high-voltage DC relay according to claim 5, characterized in that, At least some of the edges of the upper magnetic sheet are rounded to enhance the adhesion of the insulating layer.

9. The high-voltage DC relay according to claim 5, characterized in that, It also includes an arc-extinguishing insulating base, which is disposed at the bottom of the arc-extinguishing chamber. The push rod assembly passes through the arc-extinguishing insulating base to extend into the arc-extinguishing chamber. An arm extends from the arc-extinguishing insulating base to press the upper magnetic sheet against the top of the arc-extinguishing chamber.

10. The high-voltage DC relay according to claim 9, characterized in that, A buffer pad is laid between the upper magnetic conductive sheet and the top of the arc-extinguishing chamber.

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