A contact assembly and nanocrystal relay

Abstract

The application discloses a contact assembly and nanocrystalline relay and relates to the technical field of relays; the application comprises an insulating frame, two static sheets are arranged on the insulating frame, and static contacts are arranged on the static sheets; a movable plate is slidably arranged on the insulating frame, a dynamic sheet is arranged on the movable plate, two dynamic contacts are arranged on the dynamic sheet; a differential mechanism comprises a frame fixed to the insulating frame, first guide rods and second guide rods are rotatably penetrated into opposite inner walls of the frame; the force generated by an electromagnetic component does not directly act on the dynamic sheet, the differential mechanism is arranged, two-stage speed increase is realized by the differential mechanism, the moving stroke of the dynamic sheet is greater than the moving stroke of the first rack driven by the electromagnetic component, and the moving speed of the dynamic sheet is faster than the moving speed of the first rack driven by the electromagnetic component during the closing or breaking process; the separation speed and the breaking distance are increased, the contact breaking force is sufficient, the generation of electric arc is reduced, and therefore the practicability is improved.

Description

Technical Field

[0001] This invention relates to the field of relay technology, specifically to a contact assembly and a nanocrystalline 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. In fact, it is an "automatic switch" that uses a small current and a low voltage to control a larger current and a higher voltage. It plays a role in automatic adjustment, safety protection, and circuit switching in the circuit. Nanocrystalline relays use nanocrystalline materials as magnetic materials. Nanocrystalline materials have extremely low hysteresis loss and eddy current loss, and can still maintain high permeability in the high frequency range of kHz to MHz, making them suitable for high frequency switching scenarios. With the rapid development of 5G, new energy and other fields, nanocrystalline relays will become a key component of high-precision power electronic systems. The existing relays close their contacts by generating a magnetic force to attract the armature when energized, and then break them apart by the spring force when de-energized. This means that the distance between the iron core and the armature cannot be too far, otherwise the magnetic attraction cannot overcome the mechanical reaction force of the spring to ensure effective magnetic attraction. That is, the attraction stroke and the breaking stroke are consistent and synchronous. This results in a short breaking distance between the moving and stationary contacts, insufficient breaking force, and the phenomenon of arcing and damage to the relay when breaking is prone to occur. For example, the Chinese invention patent (publication number: CN106910661B) discloses a "relay with double-sided holding function". The specification states that the breaking of the moving contact and the normally open stationary contact relies on the mechanical reaction force of the moving spring. The pressure when the moving contact and the normally closed stationary contact close is also provided by the mechanical reaction force of the moving spring. However, the mechanical reaction force of the moving spring cannot be set too large (the mechanical reaction force of the moving spring is often much smaller than the magnetic attraction force, otherwise the magnetic attraction force cannot overcome the mechanical reaction force of the moving spring, and the normally open contact end of the relay cannot be closed). Therefore, conventional relays have the disadvantage of insufficient contact breaking force. The aforementioned patents can demonstrate the deficiencies of the existing technology. Therefore, this invention proposes a contact component and a nanocrystal relay. Summary of the Invention

[0003] The purpose of this invention is to provide a contact assembly and a nanocrystalline relay to solve the problems mentioned above in the background art.

[0004] To achieve the above objectives, the present invention specifically adopts the following technical solution: One objective of this invention is to provide a contact assembly comprising: An insulating frame having two stationary plates on it, each stationary plate having a stationary contact. A movable plate is slidably mounted on an insulating frame. The movable plate is provided with a movable piece, and the movable piece is provided with two movable contacts. A differential mechanism includes a frame fixed to an insulating frame. A first guide rod and a second guide rod rotatably pass through opposite sides of the inner wall of the frame. A first large gear is fixed on the first guide rod, and a small gear and a second large gear are fixed on the second guide rod. The small gear meshes with the teeth of the first large gear. A first rack and a second rack are slidably arranged on opposite sides of the inner wall of the frame, respectively, and mesh with the teeth of the first large gear and the second large gear. An electromagnetic component is connected to the first rack and is mounted on the insulating frame. When the electromagnetic component is energized or de-energized, it drives the first rack to slide. The second rack is fixedly connected to a movable plate.

[0005] Furthermore, the electromagnetic component includes an iron core mounted on an insulating frame, a coil spirally wound on the iron core, a spring telescopic rod mounted on the insulating frame, a movable block connected to the free end of the spring telescopic rod, a magnetically conductive block mounted on the movable block, and a first rack fixedly connected to the movable block.

[0006] Furthermore, the magnetically conductive block includes a cylinder fixed on the movable block, and a permanent magnet is disposed inside the cylinder.

[0007] Furthermore, the insulating frame is provided with a bracket corresponding to the stationary contact, and the bracket is provided with an arc-extinguishing component.

[0008] Furthermore, the arc-extinguishing component includes an arc-extinguishing strip fixed on a bracket. The arc-extinguishing strip is spirally shaped and tapers along the contact separation direction. An insulating ring is fixed at the end of the arc-extinguishing strip, and the arc-extinguishing strip is coated with a nanocrystalline ceramic coating.

[0009] Furthermore, the support is provided with several magnetic pole blocks arranged in a ring, with adjacent magnetic pole blocks arranged alternately with N and S poles.

[0010] Furthermore, several concentric annular grooves are provided on the opposite sides of the stationary contact and the moving contact, and a conductive reinforcement layer is embedded in the annular grooves.

[0011] Furthermore, the conductive reinforcement layer is a gradient composite structure, comprising a silver base layer, a graphene layer, and a composite ceramic layer from the inside out.

[0012] Furthermore, two vertical rods slide through the movable plate, a movable piece is fixed at the bottom end of the two vertical rods, and an abutment spring sleeved on the vertical rods is installed between the movable piece and the movable plate.

[0013] The second objective of this invention is to provide a nanocrystal relay, which includes the contact assembly described above, and also includes a housing, an insulating frame disposed inside the housing, and first pins extending to the outside of the housing are connected to both ends of the coil, and second pins extending to the outside of the housing are connected to the stationary plate.

[0014] The beneficial effects of this invention are as follows: In this invention, the force generated by the electromagnetic component does not directly act on the moving piece. By setting a differential mechanism, a two-stage speed increase is achieved, making the moving piece's travel greater than the electromagnetic component's travel on the first rack. Furthermore, during the closing or opening process, the moving piece's speed is faster than the electromagnetic component's speed on the first rack. By increasing the separation speed and disconnection distance, the contact breaking force is sufficient, reducing the generation of electric arcs and thus improving practicality.

[0015] In this invention, the magnetic guide block consists of a cylindrical body and a permanent magnet block. The cylindrical body adopts a composite tube structure with an inner layer of permalloy and an outer layer of silicon steel. The permanent magnet block is located inside the cylindrical body. By changing the magnetic field distribution, the tube wall of the cylindrical body forms a low magnetic resistance path, guiding the magnetic lines of force to extend along the axial direction of the tube body. The magnetic line density at the opening at the end of the tube body increases, realizing magnetic field focusing, thereby enhancing the magnetic attraction between the magnetic guide block and the iron core, effectively overcoming the resistance of the spring inside the spring telescopic rod, and ensuring that the moving contact and the stationary contact are effectively closed.

[0016] In this invention, by setting up an arc-extinguishing component, the radial magnetic field generated by several magnetic pole blocks applies a Lorentz force to the electric arc, forcing the electric arc to move along the spiral arc-extinguishing strip, which plays a guiding role. The electric arc is mechanically divided in the gradually narrowing pitch channel, and at the same time forms a spiral upward trajectory, with the path length increasing to 3-5 times the initial value. The arc-extinguishing effect is enhanced by mechanical constraint. The nanocrystalline ceramic coating on the surface of the arc-extinguishing strip dissipates heat rapidly through heat conduction and radiation, achieving dual arc extinguishing.

[0017] In this invention, a moving plate is mounted on a vertical rod by sliding it through a movable plate. A contact spring is fitted on the vertical rod, so that the contact time between the moving and stationary contacts is earlier than the contact time between the magnetic block and the iron core. When the two contacts, the counter-resistance force of the contact spring not only buffers the contact between the moving and stationary contacts, preventing damage caused by hard collision and improving their service life, but also ensures effective contact between the magnetic block and the iron core, ensuring the normal operation of the differential mechanism. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the contact component of the present invention; Figure 2 This is a three-dimensional structural cross-sectional view of the contact component of the present invention; Figure 3 This is a three-dimensional structural diagram of the differential mechanism of the present invention; Figure 4 This is a three-dimensional structural diagram of the stationary plate and arc-extinguishing component of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the static plate and arc-extinguishing component of the present invention; Figure 6 This is a three-dimensional structural diagram of the electromagnetic component of the present invention; Figure 7 This is a three-dimensional structural cross-sectional view of the electromagnetic component of the present invention; Figure 8 This is the present invention. Figure 5 Enlarged view of point A in the middle; Figure 9 This is a three-dimensional structural diagram of the relay of the present invention; Figure 10 This is a three-dimensional cross-sectional view of the relay structure of the present invention.

[0019] Reference numerals: 1. Insulating frame; 2. Stationary plate; 3. Stationary contact; 4. Movable plate; 5. Moving plate; 6. Moving contact; 7. Differential mechanism; 8. Support; 9. Arc extinguishing component; 10. Magnetic pole block; 11. Annular groove; 12. Conductive reinforcement layer; 13. Vertical rod; 14. Contact spring; 15. Housing; 16. First pin; 17. Second pin; 701. Frame; 702. First guide rod; 703. Second guide rod; 704. First large gear; 705. Small gear; 706. Second large gear; 707. First rack; 708. Second rack; 709. Electromagnetic component; 7091. Iron core; 7092. Coil; 7093. Spring telescopic rod; 7094. Movable block; 7095. Magnetic block; 70951. Cylinder; 70952. Permanent magnet; 901. Arc extinguishing strip; 902. Insulating ring; 1201. Silver base layer; 1202. Graphene layer; 1203. Composite ceramic layer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] like Figures 1-9 As shown, an embodiment of the present invention provides a contact assembly comprising: An insulating frame 1 is provided with two stationary plates 2, and stationary contacts 3 are provided on the stationary plates 2; preferably, the two stationary plates 2 are horizontally fixed on the insulating frame 1, and a movable plate 4 is slidably disposed on the insulating frame 1. A movable plate 5 is provided on the movable plate 4, and two movable contacts 6 are provided on the movable plate 5. A column is fixed on the insulating frame 1, and the movable plate 4 is made of insulating material (rubber) and is movably sleeved on the column. The movable plate 4 slides vertically, so that the two movable contacts 6 can respectively contact and close with the two stationary contacts 3 or move away from and break off. This is a distinguishing feature of the prior art of the present invention. The distinguishing technical features of this invention also include a differential mechanism 7, comprising a frame 701 fixed to an insulating frame 1. A first guide rod 702 and a second guide rod 703 rotatably pass through opposite sides of the inner wall of the frame 701. A first large gear 704 is fixed to the first guide rod 702, and a small gear 705 and a second large gear 706 are fixed to the second guide rod 703. The small gear 705 meshes with the first large gear 704. A first rack 707 and a second rack 708 are slidably arranged on opposite sides of the inner wall of the frame 701. Preferably, the frame... T-shaped grooves are provided on opposite sides of the inner wall of the frame 701. T-shaped sliders are fixedly mounted on both the first rack 707 and the second rack 708. The two T-shaped sliders are slidably inserted into the two T-shaped grooves. The first rack 707 and the second rack 708 mesh with the teeth of the first large gear 704 and the second large gear 706, respectively. An electromagnetic component 709 is connected to the first rack 707 and mounted on the insulating frame 1. When the electromagnetic component 709 is energized or de-energized, it drives the first rack 707 to slide. The second rack 708 is fixedly connected to the movable plate 4. Figure 3 As shown, the first rack 707 meshes with the first large gear 704, the first large gear 704 meshes with the small gear 705, and the small gear 705 is fixed to the second large gear 706 on the second guide rod 703. The second rack 708 meshes with the second large gear 706. When the electromagnetic component 709 is energized or de-energized, it drives the first rack 707 to move. Through the cooperation of the first large gear 704, the small gear 705, and the second large gear 706, the second rack 708 can be driven to move synchronously and in the same direction. Since the cooperation between the first large gear 704 and the small gear 705 is a large-gear-small-gear relationship, and the cooperation between the small gear 705 and the second large gear 706 is a small-gear-large-gear-small-gear relationship, the first rack 707 meshes with the first large gear 704, while the second rack 705 meshes with the second large gear 706. Therefore, a two-stage speed-up effect is achieved, so that when the first rack 707 and the second rack 708 move synchronously in the same direction, their moving speeds are not the same. The moving speed of the second rack 708 is greater than that of the first rack 707. When the electromagnetic component 709 is energized or de-energized, it drives the first rack 707 to move, and the second rack 708 drives the movable plate 4 to move, thereby driving the moving piece 5 to move. However, the moving stroke of the moving piece 5 is greater than the moving stroke of the electromagnetic component 709 driving the first rack 707, and the speed during the closing or opening process is faster than the speed of the electromagnetic component 709 driving the first rack 707, so that the contact breaking force is sufficient and the generation of electric arc is reduced. In this design, the force generated by the electromagnetic component 709 does not directly act on the moving piece 5. By setting a differential mechanism 7, a two-stage speed increase is achieved, making the travel of the moving piece 5 greater than the travel of the electromagnetic component 709 driving the first rack 707. Furthermore, during the closing or opening process, the moving speed of the moving piece 5 is faster than the speed at which the electromagnetic component 709 drives the first rack 707. By increasing the separation speed and the breaking distance, the contact breaking force is sufficient, reducing the generation of electric arcs and thus improving practicality.

[0022] like Figure 6 and Figure 7 As shown, the specific structure of the electromagnetic component 709 of the present invention is disclosed. The electromagnetic component 709 includes an iron core 7091 disposed on an insulating frame 1, a coil 7092 spirally wound on the iron core 7091, a spring telescopic rod 7093 disposed on the insulating frame 1, a movable block 7094 connected to the free end of the spring telescopic rod 7093, a magnetically conductive block 7095 disposed on the movable block 7094, and a first rack 707 fixedly connected to the movable block 7094. Preferably, as shown... Figure 6 and Figure 7 As shown, the spring telescopic rod 7093 includes an outer rod and an inner rod. The inner rod is slidably inserted into the outer rod. A spring is provided between the outer rod and the inner rod. The inner rod is connected to the movable block 7094. When the coil 7092 is not energized, the iron core 7091 is not magnetic. Under the elastic force of the spring telescopic rod 7093, the movable block 7094 moves away from the iron core 7091. At this time, the moving piece 5 moves away from the stationary piece 2. When the coil 7092 is energized, the iron core 7091 generates a magnetic force, which attracts the magnetic block 70 under the action of the magnetic force. 95, and compress the spring inside the spring telescopic rod 7093, thereby causing the movable block 7094 to move closer to the iron core 7091. Through the differential mechanism 7, the moving piece 5 moves downward, thereby achieving the closure of the moving contact 6 and the stationary contact 3. When the power is off, the iron core 7091 is no longer magnetic. Under the elastic force of the spring inside the spring telescopic rod 7093, the movable block 7094 is reset. Through the differential mechanism 7, the moving piece 5 moves upward, thereby achieving the disconnection and separation of the moving contact 6 and the stationary contact 3.

[0023] like Figure 7 As shown, a further technical solution for the magnetically conductive block 7095 of the present invention is disclosed. The magnetically conductive block 7095 includes a cylindrical body 70951 fixed on a movable block 7094, and a permanent magnet block 70952 is disposed inside the cylindrical body 70951. Preferably, the permanent magnet block 70952 is made of nanocrystalline material. By controlling the grain size, interface state and external field treatment, diversified magnetic behaviors from superparamagnetic, soft magnetic to permanent magnet can be achieved. Preferably, the cylindrical body 70951 adopts a composite tube structure with an inner layer of permalloy and an outer layer of silicon steel. When the permanent magnet block 70952 is in use, the magnetically conductive block 70952 can be disposed of in a certain way. When 0952 is located inside the cylinder 70951, the material composition of the cylinder 70951 will significantly change the magnetic field distribution. The tube wall of the cylinder 70951 forms a low magnetic resistance path, guiding the magnetic lines of force to extend along the axial direction of the tube. The magnetic line density at the opening at the end of the tube increases, realizing magnetic field focusing, thereby enhancing the magnetic attraction between the magnetic block 7095 and the iron core 7091, ensuring that the closing force of the moving contact 6 and the stationary contact 3 is sufficient, effectively overcoming the resistance of the spring inside the spring telescopic rod 7093, and ensuring that the moving contact 6 and the stationary contact 3 are effectively closed.

[0024] like Figure 4As shown, the present invention discloses a further technical solution for arc extinguishing during disconnection. The insulating frame 1 is provided with a bracket 8 corresponding to the stationary contact 3, and the bracket 8 is provided with an arc extinguishing element 9. By providing the arc extinguishing element 9 corresponding to the stationary contact 3 on the insulating frame 1, the arc generated during disconnection can be eliminated without affecting the normal closing and disconnection of the moving contact 6 and the stationary contact 3, thereby protecting the moving contact 6 and the stationary contact 3, and thus protecting the relay and improving its service life.

[0025] like Figure 5 The specific structure of the arc-extinguishing component 9 of the present invention is disclosed. The arc-extinguishing component 9 includes an arc-extinguishing strip 901 fixed on a support 8. The arc-extinguishing strip 901 is spirally shaped and tapers along the contact separation direction. An insulating ring 902 is fixed at the end of the arc-extinguishing strip 901. The arc-extinguishing strip 901 is coated with a nanocrystalline ceramic coating. Preferably, the support 8 includes a ring frame, which is fixed on the insulating frame 1 by a support leg. There is a gap between the ring frame and the stationary plate 2. The ring frame surrounds the stationary contact 3. The arc-extinguishing strip 901 is made of nickel-titanium shape memory alloy, which can deform. When the moving contact 6 and the stationary contact 3 are closed, the arc-extinguishing strip 901 can axially... The compression deformation does not affect the normal contact and closure of the moving contact 6 and the stationary contact 3, and can also play a buffering role to avoid hard collision between the moving contact 6 and the stationary contact 3. When the moving contact 6 and the stationary contact 3 separate, the arc generated by the break is mechanically divided in the gradually narrowing pitch channel, and at the same time, a spiral upward trajectory is formed, with the path length increasing to 3-5 times the initial value. The arc extinguishing effect is enhanced by mechanical constraint. The nanocrystalline ceramic coating on the surface of the arc extinguishing strip 901 dissipates heat quickly through heat conduction and radiation, achieving dual arc extinguishing. An insulating ring 902 is connected to the arc extinguishing strip 901 so that the arc extinguishing strip 901 does not come into contact with the moving piece 5.

[0026] like Figure 5 As shown, the present invention discloses a further technical solution for arc extinguishing. A plurality of magnetic pole blocks 10 are arranged in a ring on the support 8. Adjacent magnetic pole blocks 10 are arranged with alternating N and S poles. Preferably, an annular groove is provided on the support 8, and the magnetic pole blocks 10 are embedded in the annular groove in a ring. At the moment of contact separation, the radial magnetic field generated by the plurality of magnetic pole blocks 10 applies Lorentz force to the arc, forcing the arc to move along the spiral arc extinguishing strip 901, which plays a guiding role, thereby further improving the arc extinguishing effect.

[0027] like Figure 8As shown, a further technical solution for contact protection of the present invention is disclosed. Several annular grooves 11 arranged in concentric circles are provided on the opposite sides of the stationary contact 3 and the moving contact 6. A conductive reinforcement layer 12 is embedded in the annular grooves 11. By opening the annular grooves 11, the annular grooves 11 guide the electric arc to spread along the concentric circle, avoiding local concentrated ablation and reducing the energy density of a single electric arc by 40%. By embedding the conductive reinforcement layer 12 in the annular grooves 11, the conductivity is improved, thereby improving the protection performance of the contact and thus improving the service life of the contact assembly.

[0028] like Figure 8 As shown, the specific structure of the conductive enhancement layer 12 of the present invention is disclosed. The conductive enhancement layer 12 is a gradient composite structure, including a silver base layer 1201, a graphene layer 1202 and a composite ceramic layer 1203 from the inside out. The silver base layer 1201 ensures high conductivity, the graphene layer 1202 improves mechanical strength, and the composite ceramic layer 1203 improves oxidation resistance, thereby improving the performance of the moving contact 6 and the stationary contact 3.

[0029] like Figure 2 As shown, a further technical solution for the moving piece 5 is disclosed in this invention. Two vertical rods 13 slide through the movable plate 4, and the moving piece 5 is fixed at the bottom end of the two vertical rods 13. A contact spring 14 sleeved on the vertical rods 13 is installed between the moving piece 5 and the movable plate 4. Because the differential mechanism 7 accelerates the movement of the moving piece 5, the moving speed of the moving piece 5 is faster than the moving speed of the movable block 7094, and the moving distance of the moving piece 5 is farther than the moving distance of the movable block 7094. By sliding through the vertical rods 13 on the movable plate 4, the moving piece 5 is set on the vertical rods 13, so that in actual use, the contact time between the moving contact 6 and the stationary contact 3 is earlier than the contact time between the magnetic block 7095 and the iron core 7091. When the moving contact 6 contacts the stationary contact 3... When the vertical rod 13 slides upward under the action of the counter-attacking force, it squeezes the counter-attacking spring 14. The counter-attacking spring 14 can not only buffer the contact between the moving contact 6 and the stationary contact 3, avoiding damage caused by hard collision and improving their service life, but also provide actual elastic counter-attacking force, so that the moving contact 6 and the stationary contact 3 can effectively contact each other, ensuring the conductivity. At the same time, it can also play a buffering role, ensuring effective contact between the moving contact 6 and the stationary contact 3, and also ensuring effective contact between the magnetic block 7095 and the iron core 7091. Preferably, the vertical rod 13 is made of rubber, and a limiting plate is fixed on it. The counter-attacking spring 14 is located between the limiting plate and the movable plate 4, and the counter-attacking spring 14 does not directly contact the moving plate 5.

[0030] like Figure 9 and Figure 10As shown, an embodiment of the present invention provides a nanocrystal relay, including the contact assembly described above, and also includes a housing 15. An insulating frame 1 is disposed inside the housing 15. Both ends of the coil 7092 are connected to first pins 16 extending out of the housing 15. The stationary plate 2 is connected to second pins 17 extending out of the housing 15. The housing 15 is used to protect the relay as a whole. The first pins 16 facilitate the connection of the coil 7092 to external wires, and the second pins 17 facilitate the connection of the stationary plate 2 to external wires.

[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A contact assembly, characterized in that, include: An insulating frame (1) is provided with two stationary plates (2), and stationary contacts (3) are provided on the stationary plates (2). The movable plate (4) is slidably mounted on the insulating frame (1). The movable plate (4) is provided with a movable piece (5), and the movable piece (5) is provided with two movable contacts (6). The differential mechanism (7) includes a frame (701) fixed on an insulating frame (1). A first guide rod (702) and a second guide rod (703) rotatably pass through opposite sides of the inner wall of the frame (701). A first large gear (704) is fixed on the first guide rod (702), and a small gear (705) and a second large gear (706) are fixed on the second guide rod (703). The small gear (705) meshes with the teeth of the first large gear (704). The inner wall is slidably provided with a first rack (707) and a second rack (708) on opposite sides. The first rack (707) and the second rack (708) mesh with the teeth of the first large gear (704) and the second large gear (706) respectively. The first rack (707) is connected to an electromagnetic component (709) provided on the insulating frame (1). When the electromagnetic component (709) is energized or de-energized, it drives the first rack (707) to slide. The second rack (708) is fixedly connected to the movable plate (4). The electromagnetic component (709) includes an iron core (7091) mounted on an insulating frame (1), a coil (7092) spirally wound on the iron core (7091), a spring telescopic rod (7093) mounted on the insulating frame (1), a movable block (7094) connected to the free end of the spring telescopic rod (7093), a magnetically conductive block (7095) mounted on the movable block (7094), and a first rack (707) fixedly connected to the movable block (7094). The insulating frame (1) is provided with a bracket (8) corresponding to the stationary contact (3), and the bracket (8) is provided with an arc extinguishing element (9). The arc extinguishing component (9) includes an arc extinguishing strip (901) fixed on the bracket (8). The arc extinguishing strip (901) is spiral in shape and gradually narrows along the contact separation direction. An insulating ring (902) is fixed at the end of the arc extinguishing strip (901). The arc extinguishing strip (901) is coated with a nanocrystalline ceramic coating. Two vertical rods (13) slide through the movable plate (4), and a movable piece (5) is fixed at the bottom of the two vertical rods (13). An abutting spring (14) sleeved on the vertical rods (13) is installed between the movable piece (5) and the movable plate (4).

2. The contact assembly according to claim 1, characterized in that, The magnetic block (7095) includes a cylindrical body (70951) fixed on a movable block (7094), and a permanent magnet block (70952) is provided inside the cylindrical body (70951).

3. The contact assembly according to claim 1, characterized in that, The support (8) is provided with a number of magnetic pole blocks (10) arranged in a ring, with adjacent magnetic pole blocks (10) arranged alternately with N and S poles.

4. The contact assembly according to claim 1, characterized in that, The stationary contact (3) and the moving contact (6) each have several concentric annular grooves (11) on their opposite sides, and a conductive reinforcement layer (12) is embedded in the annular grooves (11).

5. The contact assembly according to claim 4, characterized in that, The conductive reinforcement layer (12) is a gradient composite structure, including a silver base layer (1201), a graphene layer (1202) and a composite ceramic layer (1203) from the inside out.

6. A nanocrystalline relay, characterized in that, The contact assembly includes any one of claims 1-5, and further includes a housing (15), an insulating frame (1) disposed inside the housing (15), and first pins (16) with ends extending outside the housing (15) connected to both ends of the coil (7092), and second pins (17) with ends extending outside the housing (15) connected to the stationary plate (2).

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