A contact structure and a high-voltage DC relay

Abstract

This invention discloses a contact structure and a high-voltage DC relay. The contact structure includes two stationary contacts and a moving contact. The moving contact has a rod-shaped structure, and its two ends correspond to the two stationary contacts. Because the moving contact has a rod-shaped structure, it can be formed by upsetting or machining from rod or wire material. Therefore, compared with traditional moving contacts obtained by stamping sheet metal, this invention can achieve zero-waste processing or significantly reduce waste generation, thereby greatly reducing the material cost of the moving contact.

Description

Technical Field

[0001] This invention relates to a relay, and more particularly to a contact structure and a high-voltage DC relay. Background Technology

[0002] A relay is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. Essentially, it is an "automatic switch" that uses a smaller current to control a larger current, thus playing roles in automatic adjustment, safety protection, and circuit switching. High-voltage DC relays are a type of relay. Most existing high-voltage DC relays adopt a direct-acting structure with a moving contact, utilizing two stationary contacts and one moving contact. The moving contact of existing high-voltage DC relays is generally a long strip shape, stamped from sheet metal. This stamping process generates waste material, resulting in higher material costs. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a contact structure and a high-voltage DC relay.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a contact structure, including two stationary contacts and a moving contact; the moving contact is a rod-shaped structure, and the two ends of the moving contact correspond to the two stationary contacts respectively.

[0005] Furthermore, the two stationary contacts and the moving contact are in line contact when in contact, and the direction of the line contact is consistent with the length direction of the moving contact.

[0006] Furthermore, the cross-sections of the two ends of the moving contact are respectively circular, semi-circular, or polygonal, and the surfaces of the two stationary contacts that are used to contact the moving contact are respectively planes.

[0007] Furthermore, the plane has rounded chamfers around its four edges.

[0008] Furthermore, the moving contact is formed by forging or machining from a rod or wire.

[0009] Furthermore, each of the two ends of the moving contact is provided with at least one groove at the part where it contacts the corresponding stationary contact, or each of the two stationary contacts is provided with at least one groove at the part where it contacts the moving contact; the groove is elongated and is provided along the width direction of the moving contact.

[0010] Furthermore, the middle part of the moving contact is flat.

[0011] The present invention also provides a high-voltage DC relay, including a push rod component, a coil and a moving iron core, wherein the bottom of the push rod component is fixed to the moving iron core and the moving iron core is fitted into the through hole of the coil; characterized in that it further includes a contact structure as described above, wherein the top of the push rod component is movably connected to the moving contact.

[0012] Furthermore, the push rod component includes a U-shaped bracket, a spring seat, a fixing plate, a contact spring, and a push rod; the fixing plate, the upper part of the push rod, and the spring seat are fixed together by injection molding; the U-shaped bracket is inverted, and its bottom is connected to the fixing plate; the middle part of the moving contact is mounted between the top wall of the U-shaped bracket and the spring seat by a contact spring; and the lower part of the push rod is fixedly connected to the moving iron core.

[0013] Furthermore, it also includes at least one upper yoke and at least one lower armature, with the upper yoke fixed to the lower end face of the top wall of the U-shaped bracket and the lower armature fixed to the moving contact.

[0014] Furthermore, the lower armature is U-shaped and is fitted or inserted into the middle of the moving contact, with both ends of the lower armature facing upwards; the number of the upper yoke and the lower armature is one, or the number of the upper yoke and the lower armature is at least two, and the upper yoke and the lower armature correspond one-to-one.

[0015] Furthermore, it also includes two permanent magnets, which are respectively placed on both sides of the moving contact in the length direction, and the magnetic pole direction of each permanent magnet is located in the length direction of the moving contact.

[0016] Furthermore, it also includes a ceramic cover, with the two stationary contacts respectively passing through the top of the ceramic cover and the moving contact located inside the ceramic cover; the two permanent magnets are respectively located outside the ceramic cover; it also includes two U-shaped yoke clamps, which are arranged opposite each other along the length direction of the moving contact and surround the outside of the ceramic cover, with the two permanent magnets respectively located between the corresponding U-shaped yoke clamps and the ceramic cover.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Since the moving contact is a rod-shaped structure, it can be formed by upsetting or turning using rod or wire. Therefore, compared with the traditional moving contact obtained by stamping sheet metal, the present invention can achieve waste-free processing of the moving contact or greatly reduce waste generation, thereby greatly reducing the material cost of the moving contact.

[0019] 2. The two stationary contacts and the moving contact are in line contact when in contact, which reduces the contact resistance between the stationary and moving contacts and the electrodynamic repulsion between the contacts, improves the contact reliability, facilitates rapid arc breaking, and reduces contact wear. In particular, when the cross-section of the two ends of the moving contact is circular, semi-circular, or polygonal, on the one hand, the arc-shaped surface of the moving contact or the straight line formed by the surface can be used to achieve line contact between the moving and stationary contacts. On the other hand, the arc-shaped surface of the moving contact or the inclined surface formed by the surface is set in the arc-blowing direction. When the contacts separate and the arc is drawn, under the action of the magnetic blowing field, the arc can move outward rapidly along the arc-shaped surface of the round bar or the inclined surface formed by the surface and the round chamfer of the stationary contact. As the contact gap increases rapidly, it is conducive to the outward movement of the arc root, thereby reducing the time for the arc to continuously burn at the contact position, reducing contact wear, and improving the life of the relay.

[0020] 3. The groove design allows for multi-point contact between the moving contact and the stationary contact. Under the same contact pressure, since the parallel contact resistance is less than the contact resistance of a single contact point, multi-point contact reduces the total contact resistance between the relay contacts, resulting in less heat generation and higher reliability. Furthermore, multi-point contact between the moving and stationary contacts also facilitates current shunting. Based on the principle of electro-repulsion, the reduced electro-repulsion force at multiple points improves the product's short-circuit withstand capability, thereby enhancing the relay's reliability.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the contact structure and high-voltage DC relay of the present invention are not limited to the embodiments. Attached Figure Description

[0022] Figure 1 This is an exploded view of the present invention (excluding the outer casing) in Embodiment 1;

[0023] Figure 2 This is a three-dimensional structural schematic diagram of the present invention (excluding the outer shell) according to Embodiment 1;

[0024] Figure 3 This is Example 1 Figure 2 Top view;

[0025] Figure 4 This is Example 1 Figure 3 EE sectional view;

[0026] Figure 5 This is a three-dimensional structural schematic diagram of the moving contact of the present invention in Embodiment 1;

[0027] Figure 6 This is a front view of the two stationary contacts and the moving contact of the present invention in the contact state according to Embodiment 1;

[0028] Figure 7 This is a side view of the two stationary contacts and the moving contact of the present invention in the contact state according to Embodiment 1.

[0029] Figure 8 This is a schematic diagram of the arc blowing between the stationary contact and the moving contact of the present invention in Embodiment 1;

[0030] Figure 9 This is a schematic diagram of the arc blowing of the present invention in the state of having a U-shaped yoke clamp, as described in Embodiment 1.

[0031] Figure 10 This is a schematic diagram of the arc blowing of the present invention in the absence of the U-shaped yoke clamp in Embodiment 1;

[0032] Figure 11 This is a three-dimensional structural schematic diagram of the moving contact of the present invention in Embodiment 2;

[0033] Figure 12 This is a front view of the two stationary contacts and the moving contact of the present invention in the contact state according to Embodiment 2.

[0034] Figure 13 This is a three-dimensional structural schematic diagram of the moving contact of the present invention in Embodiment 3;

[0035] Figure 14 This is a side view of the two stationary contacts and the moving contact of the present invention in the contact state in Embodiment 3;

[0036] Figure 15 This is a schematic diagram of the arc blowing between the stationary contact and the moving contact of the present invention in Embodiment 3;

[0037] Figure 16 This is a three-dimensional structural schematic diagram of the moving contact of the present invention in Embodiment 4;

[0038] Figure 17 This is a three-dimensional structural schematic diagram of the moving contact of the present invention in Embodiment 5;

[0039] Figure 18 This is a side view of the two stationary contacts and the moving contact of the present invention in the contact state in Embodiment 5;

[0040] Figure 19 This is a schematic diagram of the arc blowing between the stationary contact and the moving contact of the present invention in Embodiment 5;

[0041] Figure 20 This is a three-dimensional structural schematic diagram of the moving contact of the present invention in Embodiment Six;

[0042] Figure 21 This is a side view of the two stationary contacts and the moving contact of the present invention in the contact state in Embodiment Six;

[0043] Figure 22 This is a schematic diagram of the arc blowing between the stationary contact and the moving contact of the present invention in Embodiment Six;

[0044] Figure 23 This is an exploded view of the present invention in Embodiment Seven;

[0045] Figure 24 This is a three-dimensional structural diagram of the moving contact and lower armature of the present invention in the combined state, as shown in Embodiment 7. Figure 1 ;

[0046] Figure 25 This is a three-dimensional structural diagram of the moving contact and another lower armature of the present invention in a combined state, as shown in Embodiment 7.

[0047] Figure 26 This is a cross-sectional view of the present invention in Embodiment Seven;

[0048] Figure 27 This is a three-dimensional structural schematic diagram of the two stationary contacts of the present invention in Embodiment 8;

[0049] Figure 28 This is a front view of the two stationary contacts and the moving contact of the present invention in the contact state in Embodiment 8;

[0050] Figure 29 This is a side view of the two stationary contacts and the moving contact of the present invention in the contact state in Embodiment 8. Detailed Implementation

[0051] Example 1

[0052] Please see Figures 1-10 As shown, a contact structure of the present invention includes two stationary contacts 1 and a moving contact 6. The contact structure of the present invention can be applied to high-voltage DC relays, but is not limited thereto. When the contact structure of the present invention is applied to a high-voltage DC relay, the high-voltage DC relay, in addition to the stationary contacts 1 and the moving contact 6, also includes a push rod component, a coil 14, and a moving iron core 13. The two ends of the moving contact 6 correspond to the two stationary contacts 1 respectively. The top of the push rod component is movably connected to the middle of the moving contact 6, and the bottom of the push rod component is fixed to the moving iron core 13. The moving iron core 13 is fitted into the through hole of the coil 14. The moving contact 6 has a rod-shaped structure, and its two ends 61 correspond to the two stationary contacts 1 respectively. Specifically, the two stationary contacts 1 are arranged side-by-side along the length of the moving contact 6, and the moving contact 6 is located below the stationary contacts 1. The two ends 61 of the moving contact 6 are respectively fitted into the bottom end of the stationary contacts 1. The moving contact 6 is specifically formed by forging or machining from rod or wire. The rod-shaped structure refers to a structure that is consistent with or substantially consistent with the rod or wire material, and its cross-section can be circular, semi-circular, polygonal, etc. The middle part 62 of the moving contact 6 is stamped into a flat plate shape.

[0053] In this embodiment, the two stationary contacts 1 and the moving contact 6 are in line contact with each other, and the direction of the line contact is consistent with the length direction of the moving contact 6. Specifically, the cross-sections of the two ends of the moving contact 6 are circular, that is, the moving contact 6 is made of a round rod, and the bottom surfaces of the two stationary contacts 1 that are in contact with the moving contact 6 are planes, and the four edges of the planes are respectively provided with rounded chamfers 11. Figure 6 In the three-dimensional coordinate system, the length direction of the moving contact is consistent with the Y-axis direction, and the width direction of the moving contact is consistent with the X-axis direction.

[0054] In this embodiment, a high-voltage DC relay of the present invention includes a stationary contact 1, a moving contact 6, a push rod assembly, a coil 14, and a moving iron core 13. The push rod assembly includes a U-shaped bracket 4, a spring seat 8, a fixing plate 82, a contact spring 7, and a push rod 81. The upper parts of the fixing plate 82 and the push rod 81 are fixed together with the spring seat 8 by injection molding. The U-shaped bracket 4 is inverted, and its bottom is connected to the fixing plate 82. The middle part of the moving contact 6 is mounted between the top wall of the U-shaped bracket 4 and the spring seat 8 through the contact spring 7. The lower part of the push rod 81 is fixedly connected to the moving iron core 13.

[0055] In this embodiment, the coil 14 is located in a U-shaped yoke 16, and a magnetic cylinder 15 extending into the coil 14 is provided at the bottom center of the U-shaped yoke 16. The moving iron core 13 is movably fitted inside the magnetic cylinder 15. A yoke plate 10 is connected to the upper end of the U-shaped yoke 16, and a frame plate 9 is provided at the upper end of the yoke plate 10. The yoke plate 10 and the frame plate 9 are brazed together, and a stationary iron core 11 is fitted in the middle of the yoke plate 10. The bottom of the push rod 8 passes through the frame plate 9, the stationary iron core 11 and a reaction spring 12 from top to bottom, and is fixedly connected to the moving iron core 13. The reaction spring 12 is stretched between the stationary iron core 11 and the moving iron core 13.

[0056] In this embodiment, the invention further includes two permanent magnets 5, which are respectively positioned on both sides of the moving contact 6 along its length. The magnetic poles of each permanent magnet 5 are respectively located along the length of the moving contact 6, that is, the N pole and S pole of each permanent magnet 5 are distributed along the length of the moving contact 6. The invention also includes a ceramic cover 2 located above the frame plate 9, the frame plate 9 being brazed to the ceramic cover 2. The two stationary contacts 1 are respectively inserted through the top of the ceramic cover 2, and the moving contact 6 is located inside the ceramic cover 2; the two permanent magnets 5 are respectively located outside the ceramic cover 2. The invention also includes two U-shaped yoke clips 3, which are arranged opposite each other along the length of the moving contact 6 and surround the outside of the ceramic cover 2. The two permanent magnets 5 are respectively located between the corresponding U-shaped yoke clips 3 and the ceramic cover 2.

[0057] This invention discloses a contact structure and a high-voltage DC relay. Because its moving contact 6 is a rod-shaped structure, it can be formed by forging or machining from rod or wire material. Therefore, compared with traditional moving contacts obtained by sheet metal stamping, this invention can achieve waste-free processing of the moving contact 6 or greatly reduce waste generation, thereby significantly reducing the material cost of the moving contact 6. The two stationary contacts 1 and the moving contact 6 are in line contact in the contact state, reducing the contact resistance between the stationary contacts 1 and the moving contact 6 and the electro-repulsive force between the contacts, thus improving the contact reliability. In particular, because the cross-section of the two ends 61 of the moving contact 6 is circular, the moving contact 6 can be made from a round rod. Thus, on the one hand, the arc-shaped surface of the round rod can be directly used to achieve line contact between the moving contact 6 and the stationary contacts 1; on the other hand, when the contacts separate and arc is drawn, under the action of the magnetic blowing magnetic field, the arc can move rapidly outward along the arc-shaped surface of the round rod and the rounded chamfer 11 of the stationary contact 1. Figure 8 As shown, as the contact gap rapidly increases, it facilitates the outward movement of the arc root, thereby reducing the time the arc continues to burn at the contact point, reducing contact wear, and improving the relay's lifespan. Furthermore, under the magnetic field of the two permanent magnets 5, the arcs generated by the separation of the two stationary contacts 1 and the moving contact 6 are rapidly pulled apart in their respective directions. Specifically, when the two permanent magnets 5 are of the same polarity and facing each other, the arcs blow towards the same side (in...). Figure 9 , Figure 10 From a visual perspective, the direction of the electric arc generated by the separation of the two stationary and moving contacts can be either upper left-upper right or lower left-lower right. When the two permanent magnets are of the same polarity but not opposite each other, the electric arc will blow in different directions (in...). Figure 9 , Figure 10 From a certain perspective, the directions of the electric arcs generated by the separation of the two stationary and moving contacts are either upper left to lower right or lower left to upper right. Figure 9 , Figure 10 In the diagram, the arrow indicates the direction of the magnetic field arcing, and the dashed line indicates the direction of the magnetic field. The arc-extinguishing space in the width direction of the moving contact is larger than the arc-extinguishing space in the length direction of the moving contact in this invention.

[0058] Example 2

[0059] Please see Figure 11 , Figure 12 As shown, the contact structure and high-voltage DC relay of the present invention differ from the first embodiment described above in that: at least one groove 63 is provided at each of the two ends of the moving contact 6 where it contacts the corresponding stationary contact 1. The number of grooves 63 is specifically one, but not limited to this. The groove 63 is approximately located at the middle of the upper surface of its respective end, and the groove 63 is elongated and arranged along the width direction of the moving contact 6.

[0060] In this invention, a high-voltage DC relay features a groove 63 that allows for multi-point contact between the moving contact 6 and the stationary contact 1. Under the same contact pressure, since the parallel contact resistance is less than the contact resistance of a single contact point, multi-point contact reduces the total contact resistance between the relay contacts, resulting in less heat generation and higher reliability. Furthermore, multi-point contact between the moving contact and the stationary contact 1 also facilitates current shunting. Based on the principle of electro-repulsion, the multi-point electro-repulsion reduces the total electro-repulsion force (the electro-repulsion force is proportional to the square of the current, and the sum of the shunted electro-repulsion forces is less than the original electro-repulsion force), which improves the product's short-circuit withstand capability and thus enhances the relay's reliability.

[0061] Example 3

[0062] Please see Figures 13-15 As shown, the contact structure and high-voltage DC relay of the present invention differ from the embodiments described above in that the cross-sections of the two ends 61 of the moving contact are polygonal, specifically triangular, with one vertex of the triangle pointing upwards to mate with the bottom end of the stationary contact. Thus, the stationary contact 1 and the moving contact 6 remain in line contact when in contact. Under the action of the magnetic blowing field, the electric arc 17 generated between the stationary contact 1 and the moving contact 6 can rapidly move outwards along the corresponding inclined surface of the end 61 of the moving contact and the rounded chamfer 11 of the stationary contact 1, such as... Figure 15 As shown.

[0063] Example 4

[0064] Please see Figure 16 As shown, the contact structure and high-voltage DC relay of the present invention differ from the above-described embodiment three in that: at least one groove 63 is provided at each of the two ends 61 of the moving contact 6 where it contacts the corresponding stationary contact 1. The number of grooves 63 is specifically one, but not limited to this. The groove 63 is approximately located at the middle of the upper surface of its respective end, and the groove 63 is elongated and located in the width direction of the moving contact 6.

[0065] The groove 63 allows for multi-point contact between the moving contact 6 and the stationary contact 1. Under the same contact pressure, since the parallel contact resistance is less than the contact resistance of a single contact point, multi-point contact reduces the total contact resistance between the relay contacts, resulting in less heat generation and higher reliability. Furthermore, multi-point contact between the moving contact and the stationary contact 1 also facilitates current shunting. Based on the principle of electro-repulsion, the reduced electro-repulsion force at multiple points improves the product's short-circuit withstand capability, thereby enhancing the relay's reliability.

[0066] Example 5

[0067] Please see Figures 17-19As shown, the contact structure and high-voltage DC relay of the present invention differ from the embodiments described above in that the cross-sections of the two ends 61 of the moving contact are respectively pentagonal, with one vertex of the pentagon pointing upwards to mate with the bottom end of the stationary contact 1. Thus, the stationary contact 1 and the moving contact 6 remain in line contact when in contact. Under the action of the magnetic blowing field, the electric arc 17 generated between the stationary contact 1 and the moving contact 6 can rapidly move outwards along the corresponding inclined surface of the end 61 of the moving contact and the rounded chamfer 11 of the stationary contact 1, such as... Figure 19 As shown.

[0068] Example 6

[0069] Please see Figures 20-22 As shown, the contact structure and high-voltage DC relay of the present invention differ from the embodiments described above in that the cross-sections of the two ends 61 of the moving contact are respectively hexagonal, with one vertex of the hexagon pointing upwards to mate with the bottom end of the stationary contact 1. Thus, the stationary contact 1 and the moving contact 6 remain in line contact when in contact. Under the action of the magnetic blowing field, the electric arc 17 generated between the stationary contact 1 and the moving contact 6 can rapidly move outwards along the corresponding inclined surface of the moving contact end 61 and the rounded chamfer 11 of the stationary contact 1, such as... Figure 22 As shown.

[0070] Example 7

[0071] Please see Figures 23-26 As shown, the contact structure and high-voltage DC relay of the present invention differ from the first embodiment described above in that: the present invention further includes at least one upper yoke 18 and at least one lower armature 19. The upper yoke 18 is fixed to the lower end face of the top wall of the U-shaped bracket 4, and the lower armature 19 is fixed to the moving contact 6. The lower armature 19 is specifically U-shaped and is fitted or inserted into the middle 62 of the moving contact, with both ends of the lower armature 19 facing upwards. Figure 25 As shown, there is one upper yoke 18 and one lower armature 19. The two sides of the lower armature 19 are located on both sides of the middle part 62 of the moving contact in the width direction. When a large short-circuit current flows through the moving contact 6, the magnetic attraction of the upper yoke 18 to the lower armature 19 pushes the moving contact 6 upward to resist the electrodynamic repulsion caused by the short-circuit current. Figure 23 , 24As shown, the number of upper yokes 18 and lower armatures 19 is at least two, specifically two, but not limited to this. The upper yokes 18 and lower armatures 19 are vertically aligned. The two upper yokes 18 are distributed along the width direction of the top wall of the U-shaped bracket 4, and the two lower armatures 19 are located on opposite sides of the moving contact's center 62 in the width direction, with their adjacent sides inserted into the clearance through-holes 621 provided in the moving contact's center 62. The fact that there are at least two upper yokes 18 and lower armatures 19 increases the number of magnetic pole faces (at least four in total), improves magnetic efficiency, and increases the attractive force.

[0072] Example 8

[0073] Please see Figures 27-29 As shown, the contact structure and high-voltage DC relay of the present invention differ from the first embodiment described above in that: the two stationary contacts 1 are each provided with at least one groove 12 at the portion where they contact the moving contact 6. The number of grooves 12 is specifically one, but not limited to this. The groove 12 is elongated and is arranged along the width direction of the moving contact 6.

[0074] The groove 12 allows for multi-point contact between the moving contact 6 and the stationary contact 1. Under the same contact pressure, since the parallel contact resistance is less than the contact resistance of a single contact point, multi-point contact reduces the total contact resistance between the relay contacts, resulting in less heat generation and higher reliability. Furthermore, multi-point contact between the moving contact and the stationary contact 1 also facilitates current shunting. Based on the principle of electro-repulsion, the reduced electro-repulsion force at multiple points improves the product's short-circuit withstand capability, thereby enhancing the relay's reliability.

[0075] The stationary contact 1 and the moving contact 6 remain in line contact when in contact. Under the action of the magnetic blowing field, the electric arc 17 generated between the stationary contact 1 and the moving contact 6 can rapidly move outward along the arc-shaped surface of the end 61 of the moving contact and the rounded chamfer 11 of the stationary contact 1, such as... Figure 29 As shown.

[0076] The contact structure and high-voltage DC relay of the present invention are identical to or can be implemented using existing technologies for the parts not described herein.

[0077] The above embodiments are only used to further illustrate a contact structure and a high-voltage DC relay of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A contact structure comprising two stationary contacts and a moving contact; characterized in that: The moving contact has a rod-shaped structure, and the two ends of the moving contact correspond to the two stationary contacts respectively; The moving contact has an arc-shaped surface or a surface with an inclined plane. The surfaces of the two stationary contacts that are in contact with the moving contact are planes, and the planes are parallel to the length and width directions of the moving contact. The two stationary contacts and the moving contact are in line contact in the contact state, and the direction of the line contact is consistent with the length direction of the moving contact. The contact structure also includes two permanent magnets, which are respectively placed on both sides of the moving contact in the length direction. The magnetic pole direction of each permanent magnet is located in the length direction of the moving contact, so that the moving contact can achieve arc displacement on both sides of the moving contact surface along the width direction of the moving contact at the line contact position.

2. The contact structure according to claim 1, characterized in that: The cross-sections at both ends of the moving contact are respectively circular, semi-circular, or polygonal.

3. The contact structure according to claim 2, characterized in that: The plane has rounded chamfers around its four edges.

4. The contact structure according to claim 1, characterized in that: The moving contact is formed by upset or machined from bar or wire.

5. The contact structure according to any one of claims 1-4, characterized in that: The moving contact has at least one groove at each end of its two ends where it contacts the corresponding stationary contact, or the two stationary contacts have at least one groove at each end of their respective ends where they contact the moving contact; the groove is elongated and is arranged along the width of the moving contact.

6. The contact structure according to any one of claims 1-4, characterized in that: The middle part of the moving contact is flat.

7. A high-voltage DC relay, comprising a push rod assembly, a coil, and a moving iron core, wherein the bottom of the push rod assembly is fixed to the moving iron core, and the moving iron core is fitted into a through hole in the coil; characterized in that, It also includes a contact structure as described in any one of claims 1-6, wherein the top of the push rod component is movably connected to the moving contact.

8. The high-voltage DC relay according to claim 7, characterized in that: The push rod component includes a U-shaped bracket, a spring seat, a fixing plate, a contact spring, and a push rod; the fixing plate, the upper part of the push rod, and the spring seat are fixed together by injection molding; the U-shaped bracket is inverted, and its bottom is connected to the fixing plate; the middle part of the moving contact is mounted between the top wall of the U-shaped bracket and the spring seat by a contact spring; and the lower part of the push rod is fixedly connected to the moving iron core.

9. The high-voltage DC relay according to claim 8, characterized in that: It also includes at least one upper yoke and at least one lower armature, with the upper yoke fixed to the lower end face of the top wall of the U-shaped bracket and the lower armature fixed to the moving contact.

10. The high-voltage DC relay according to claim 9, characterized in that: The lower armature is U-shaped and is fitted or inserted into the middle of the moving contact, with both ends of the lower armature facing upwards; the number of the upper yoke and the lower armature is one, or the number of the upper yoke and the lower armature is at least two, and the upper yoke and the lower armature correspond one-to-one.

11. The high-voltage DC relay according to claim 7, characterized in that: It also includes a ceramic cover, with the two stationary contacts respectively passing through the top of the ceramic cover and the moving contact located inside the ceramic cover; the two permanent magnets are respectively located outside the ceramic cover; it also includes two U-shaped yoke clamps, which are arranged opposite to each other along the length direction of the moving contact and surround the outside of the ceramic cover, with the two permanent magnets respectively located between the U-shaped yoke clamps on the corresponding sides and the ceramic cover.

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