Contactor

Abstract

The invention belongs to the technical field of electrical elements, and particularly relates to a contactor which comprises a shell, a static contact assembly and a moving contact assembly, the static contact assembly comprises a first static contact and a second static contact which are oppositely arranged, and the first static contact and the second static contact are each provided with a frustum-shaped inner wall facing the moving contact assembly side; and the moving contact assembly is provided with a frustum structure matched with the frustum-shaped inner wall. The frustum structure of the moving contact assembly is attached to the frustum-shaped inner wall, so that the effective contact area is remarkably increased, the contact resistance and the temperature rise are reduced, and the large-current conductive stability is improved; meanwhile, the distance between the roots of the first static contact and the second static contact is compressed to a safety critical value by utilizing the guiding characteristic of a conical surface, so that the consumption of silver alloy and other precious metal contact materials is greatly reduced, and the manufacturing cost and the product size are reduced; the conical surface contact effectively disperses the electric field intensity in the breaking process, the arc generation rate is reduced from the structural design, the service life of the contact is prolonged, and the breaking reliability is improved.

Description

Technical Field

[0001] This invention belongs to the field of electrical component technology, and specifically relates to a contactor. Background Technology

[0002] Currently, contactors generally employ a planar or simple arc-surface mating structure for their stationary and moving contacts. This design suffers from three inherent drawbacks: First, the effective contact area is limited, resulting in high contact resistance and significant temperature rise under high current, affecting conductivity stability. Second, to prevent interphase arcing during disconnection, a large safety distance must be maintained between the two stationary contacts, leading to a bulky contact assembly and high consumption of precious metal contact materials such as silver alloys, resulting in high costs. Third, the contact area decreases sharply and the electric field becomes highly concentrated at the moment of contact separation, easily inducing initial arcing and exacerbating contact erosion. Although attempts have been made to optimize this design with structures such as double-break points, these methods have failed to overcome the aforementioned contradictions at their root cause: the contact shape and spacing. Summary of the Invention

[0003] The purpose of this application is to provide a contactor that solves the technical problems of existing contactors with planar contact structure, such as small effective contact area, large stationary contact spacing, high cost of precious metal materials, and easy arcing during disconnection.

[0004] This application provides a contactor, including a housing, a stationary contact assembly, and a moving contact assembly. The stationary contact assembly is disposed on the housing and includes a first stationary contact and a second stationary contact disposed opposite to each other. The first stationary contact and the second stationary contact each have a frustoconical inner wall facing the moving contact assembly side. The moving contact assembly is provided with a frustum structure that mates with the frustum-shaped inner wall.

[0005] Optionally, the moving contact assembly includes an insulating fixing head and a moving contact body nested in the insulating fixing head. The moving contact body has a frustoconical outer wall that mates with the frustoconical inner wall, and the two ends of the insulating fixing head protrude from the two ends of the moving contact body, respectively.

[0006] Optionally, the frustum-shaped inner wall is an incomplete conical surface, and the central angle of the directrix of the frustum-shaped inner wall is 60°~135°.

[0007] Optionally, the contactor further includes an arc-extinguishing blocking mechanism, which is disposed above the stationary contact assembly. The arc-extinguishing blocking mechanism includes an elastic telescopic structure and an insulating blocking component connected to the lower end of the elastic telescopic structure. During the opening process, the moving contact assembly moves away from the stationary contact assembly. The insulating blocking component maintains contact with the moving contact assembly under the elastic force of the elastic telescopic structure and moves down synchronously, gradually inserting into the gap between the first stationary contact and the second stationary contact, thereby physically isolating the arc generated during the opening.

[0008] Optionally, the contactor further includes a drive mechanism for driving the moving contact assembly.

[0009] Optionally, the insulating barrier assembly includes two insulators disposed within the housing, a first elastic telescopic member with its two ends respectively abutting against the two insulators, and a guide member that slides with the two insulators. The guiding direction of the guide member is consistent with the telescopic direction of the first elastic telescopic member. The first elastic telescopic member is used to push the two insulators to respectively adhere to the first stationary contact and the second stationary contact.

[0010] Optionally, the driving device is a pneumatic assembly, which includes a cylinder, a piston, and a rod. The rod is connected to the moving contact assembly, and the movement of the rod drives the moving contact assembly. The insulating fixed head is connected to the pneumatic assembly.

[0011] Optionally, the elastic telescopic structure is a compression spring, a disc spring assembly, or a silicone elastomer.

[0012] Optionally, the two insulators are arranged opposite to each other or nested together, and the two insulators have receiving cavities for housing the first elastic telescopic member.

[0013] Optionally, the guide includes a connector inserted into the elastic telescopic structure and a guide rod laterally fixed to the connector, with both ends of the guide rod being movably inserted into the two insulators respectively.

[0014] Optionally, the cylinder body is sealed to the outer shell, and the inner cavity of the outer shell is a vacuum chamber.

[0015] Optionally, the two insulators can be combined to form a frustum or a frustum.

[0016] Optionally, the housing has a conical cavity near the stationary contact assembly for guiding the two insulators to close together when the circuit is closed.

[0017] Optionally, the first elastic telescopic member is a compression spring, a disc spring assembly, or a silicone elastomer.

[0018] Optionally, the outer casing includes a first housing and a second housing that are detachably connected, the second housing being connected to the cylinder body, and the lateral dimension of the inner cavity of the second housing being 2 to 5 times the lateral dimension of the rod body.

[0019] Optionally, the pneumatic assembly further includes a second elastic telescopic member for assisting in pushing the piston to reset.

[0020] Optionally, the second elastic telescopic member is a compression spring, a disc spring assembly, or a silicone elastomer.

[0021] The beneficial effects of this application are that the frustum structure of the moving contact assembly, in close contact with the frustum-shaped inner wall, significantly increases the effective contact area, reduces contact resistance and temperature rise, and improves the stability of high-current conduction. At the same time, the cone-shaped guiding characteristics are used to compress the distance between the roots of the first and second stationary contacts to a safe critical value, which greatly reduces the amount of precious metal contact materials such as silver alloys, thereby reducing manufacturing costs and product volume. The cone-shaped contact effectively disperses the electric field intensity during the breaking process, reducing the arc generation rate from a structural design perspective, extending contact life and improving breaking reliability. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the contactor provided in an embodiment of this application; Figure 2 This is an exploded structural diagram of the contactor provided in an embodiment of this application; Figure 3 This is a cross-sectional structural diagram of the contactor provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the guide component provided in an embodiment of this application.

[0023] In the diagram: 100, outer shell; 110, first shell; 111, conical cavity; 120, second shell; 130, vacuum cavity; 200, stationary contact assembly; 210, first stationary contact; 220, second stationary contact; 230, frustum-shaped inner wall; 300, moving contact assembly; 310, insulating fixing head; 320, moving contact body; 400, arc-extinguishing blocking mechanism; 410, elastic telescopic structure; 420, insulator; 421, receiving cavity; 430, first elastic telescopic component; 440, guide component; 441, connector; 442, guide rod; 500, pneumatic assembly; 510, cylinder; 520, piston; 530, rod; 540, second elastic telescopic component. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] Before introducing the embodiments of this application, the background technology involved in this application will be introduced first.

[0026] Currently, contactors generally employ a planar or simple arc-surface mating structure for their stationary and moving contacts. This design suffers from three inherent drawbacks: First, the effective contact area is limited, resulting in high contact resistance and significant temperature rise under high current, affecting conductivity stability. Second, to prevent interphase arcing during disconnection, a large safety distance must be maintained between the two stationary contacts, leading to a bulky contact assembly and high consumption of precious metal contact materials such as silver alloys, resulting in high costs. Third, the contact area decreases sharply and the electric field becomes highly concentrated at the moment of contact separation, easily inducing initial arcing and exacerbating contact erosion. Although attempts have been made to optimize this design with structures such as double-break points, these methods have failed to overcome the aforementioned contradictions at their root cause: the contact shape and spacing.

[0027] As a core switching element in power control systems, contactors inevitably generate an electric arc the instant the moving and stationary contacts separate when interrupting load current. If the arc cannot be extinguished quickly, it will lead to severe contact erosion, decreased insulation performance, and even phase-to-phase short circuits or fires, directly affecting equipment lifespan and system safety. Therefore, efficient and reliable arc-extinguishing technology is a key aspect of contactor design.

[0028] Currently, the widely used arc extinguishing technologies mainly include: Arc extinguishing by grid plates: The electric arc is divided into multiple short arc segments by copper / zinc plated metal grid plates, and extinguished by increasing the near-electrode voltage drop and heat dissipation (such as CJ0-40 contactor). Magnetic blowout and electrodynamic arc extinguishing: The electric arc is elongated and guided into the arc extinguishing chamber by using the magnetic field of the current itself or an external magnetic field; Longitudinal slot arc extinguishing: The arc is compressed and cooled by a slit made of arc-resistant material (common in contactors with a current of 20A or higher). Improvement solutions include auxiliary contact delay separation or arc ignition structure optimization.

[0029] However, existing technologies still have the following significant drawbacks: The arc extinguishing process is mostly a "passive response", relying on the arc's own motion characteristics (such as sufficient current to generate magnetic blow-out force, and the arc stably entering the grid plate). In the initial stage of contact separation, there is a lack of active intervention mechanism, which can easily cause local high-temperature welding or ablation at the contact tip. When interrupting a small current (such as in a control circuit or under light load conditions), the arc energy is low, making it difficult to effectively trigger magnetic blowout or electrodynamic arc extinguishing, resulting in prolonged arcing time and decreased interruption reliability. Additional structures such as grid plates and arc-extinguishing chambers are relatively large, increasing product costs and installation space requirements.

[0030] In summary, existing contactors suffer from problems such as small contact area, large stationary contact spacing (leading to high costs of precious metal materials), and low reliability due to the planar contact structure. To address these issues, this application provides a contactor.

[0031] like Figures 1-4 As shown, the contactor provided in this application includes a housing 100, a stationary contact assembly 200, and a moving contact assembly 300. The stationary contact assembly 200 is disposed on the housing 100 and includes a first stationary contact 210 and a second stationary contact 220 disposed opposite to each other. The first stationary contact 210 and the second stationary contact 220 each have a frustoconical inner wall 230 facing the moving contact assembly 300. The moving contact assembly 300 is provided with a frustoconical structure that cooperates with the frustoconical inner wall 230.

[0032] The contactor provided in this application, when closed, has its frustum-shaped structure of the moving contact assembly 300 precisely embedded axially between the frustum-shaped inner walls 230 of the first stationary contact 210 and the second stationary contact 220, forming a conical surface contact, and the conductive path is stable and reliable; when opened, the frustum-shaped structure smoothly disengages along the conical surface, and the contact area gradually shrinks with displacement, avoiding a sudden increase in current density and electric field concentration caused by abrupt changes in contact area, and suppressing the induction of initial electric arc from the structural source.

[0033] The contactor provided in this application features a frustoconical structure in the moving contact assembly 300 that fits snugly against the frustoconical inner wall 230, significantly increasing the effective contact area, reducing contact resistance and temperature rise, and improving high-current conductivity stability. Simultaneously, the conical guiding characteristics compress the distance between the roots of the first stationary contact 210 and the second stationary contact 220 to a safe critical value, drastically reducing the amount of precious metal contact materials such as silver alloys, thus lowering manufacturing costs and product size. The conical contact effectively disperses the electric field intensity during the breaking process, reducing the arc generation rate from a structural design perspective, extending contact life, and improving breaking reliability.

[0034] In some possible implementations, the moving contact assembly 300 includes an insulating fixing head 310 and a moving contact body 320 nested in the insulating fixing head 310. The moving contact body 320 has a frustoconical outer wall that mates with the frustoconical inner wall 230. The two ends of the insulating fixing head 310 protrude from the two ends of the moving contact body 320, respectively.

[0035] Specifically, the moving contact body 320 is made of conductive metal, such as pure copper, copper alloy, or silver cadmium oxide alloy. Its outer periphery forms a frustoconical outer wall that precisely matches the frustoconical inner wall 230 of the stationary contact, ensuring concentrated contact pressure and reliable conductivity when the circuit is closed. The insulating fixing head 310 is made of high-temperature resistant engineering plastic or ceramic, and is integrally inserted into the moving contact body 320. Both ends of the head protrude from the end face of the moving contact body 320 and cover most of the end face of the moving contact body 320. During the opening process, when the moving contact body 320 separates from the stationary contact assembly 200 and generates an arc, the protruding portions at both ends of the insulating fixing head 310 first enter and cover the upper and lower edge areas of the gap between the first stationary contact 210 and the second stationary contact 220, forming a bidirectional insulating barrier. This effectively suppresses the arc from spreading upwards or downwards along the end of the moving contact body 320, forcing the arc to be confined to the narrow central channel. Simultaneously, the insulating fixing head 310 provides a clear alignment reference and synchronously moving support surface for the insulator 420 in the upper arc-extinguishing barrier mechanism 400, ensuring its precise insertion into the core area of ​​the gap. The moving contact assembly 300 significantly extends the arc creepage path, restricts the plasma expansion space, and works synergistically with the insulating barrier assembly to extinguish the arc.

[0036] In some possible implementations, the frustum-shaped inner wall 230 is an incomplete conical surface, and the central angle of the directrix of the frustum-shaped inner wall 230 is 60°~135°.

[0037] Specifically, the frustum-shaped inner wall 230 of the first stationary contact 210 and the second stationary contact 220 facing the moving contact assembly 300 is designed as an incomplete conical surface, with its generatrix extending axially, while the guideline (i.e., the cross-sectional profile perpendicular to the axis) is only a segment of arc, with the corresponding central angle controlled within the range of 60° to 135°, forming a symmetrically distributed "C"-shaped or fan-shaped groove structure; thus, the guiding and self-centering functions required for the frustum mating are retained.

[0038] In some embodiments, the first stationary contact 210 and the second stationary contact 220 are formed by partial stamping / machining of a copper alloy substrate, the conical surface is silver-plated to ensure conductivity, and the non-working area is insulated.

[0039] The contactor also includes an arc-extinguishing isolation mechanism 400, which is disposed above the stationary contact assembly 200. The arc-extinguishing isolation mechanism 400 includes an elastic telescopic structure 410 and an insulating barrier component connected to the lower end of the elastic telescopic structure 410. During the opening process, the moving contact assembly 300 moves away from the stationary contact assembly 200. The insulating barrier component maintains contact with the moving contact assembly 300 under the elastic force of the elastic telescopic structure 410 and moves down synchronously, gradually inserting into the gap between the first stationary contact 210 and the second stationary contact 220 to physically isolate the arc generated during the breaking process.

[0040] After the tripping command is triggered, the moving contact assembly 300 moves downward (away from the stationary contact) under the action of the driving mechanism. Simultaneously, the insulating barrier component in the arc-extinguishing isolation mechanism 400, maintained by the pre-tightening force of the elastic telescopic structure 410, remains in close contact with the surface of the moving contact assembly 300 and moves downward synchronously. At the instant the moving and stationary contacts separate and generate an arc, the insulating barrier component is precisely inserted into the conical gap between the first stationary contact 210 and the second stationary contact 220, forming a high-insulation barrier that forcibly physically isolates the arc—directly cutting off the arc's conductive path, compressing the arc space, hindering the diffusion of ionized gas, and accelerating cooling through heat absorption by the insulating material. This process does not depend on the arc's energy or magnetic field; it actively intervenes at the initial stage of tripping, efficiently extinguishing the arc in its nascent stage, making it particularly valuable for high-current contactors.

[0041] The contactor provided in this application fundamentally solves the pain points of passive response and low reliability of low-current breaking in traditional arc extinguishing technology through the "synchronous follow-up + physical isolation" mechanism. It significantly shortens the arcing time, greatly reduces the risk of contact erosion and welding, and improves the breaking stability and safety under low-energy conditions such as light load and control circuit. Structurally, it eliminates complex accessories such as grid plates and magnetic blow-out coils, simplifies the arc extinguishing chamber design, and reduces manufacturing costs and installation space requirements. At the same time, the frustum-shaped moving contact assembly 300 and the frustum-shaped inner wall 230 of the first stationary contact 210 and the second stationary contact 220 cooperate to improve the motion guidance accuracy, providing a more compact, efficient, and universal arc extinguishing solution for power control systems.

[0042] It should be noted that, in the closed state, the moving contact assembly 300 is tightly fitted with the frustoconical inner wall 230 of the first stationary contact 210 and the second stationary contact 220 to form a conductive path, and the insulating barrier assembly abuts against the upper end face of the moving contact under the elastic force of the elastic telescopic structure 410.

[0043] In some possible implementations, the insulating barrier assembly includes two insulators 420 disposed within the housing 100, a first elastic telescopic member 430 whose two ends respectively abut against the two insulators 420, and a guide member 440 that slides with the two insulators 420. The guiding direction of the guide member 440 is consistent with the telescopic direction of the first elastic telescopic member 430. The first elastic telescopic member 430 is used to push the two insulators 420 to fit against the first stationary contact 210 and the second stationary contact 220 respectively.

[0044] In the above implementation, when the circuit breaker is opened, the moving contact assembly 300 is driven to move downward, and the elastic telescopic structure 410 of the arc extinguishing and blocking mechanism 400 causes the entire insulating blocking assembly to move downward synchronously with the moving contact. At the same time, the first elastic telescopic member 430 arranged laterally inside the insulating blocking assembly pushes the two insulators 420 to expand to both sides along the guide member 440, closely fitting the upper edge of the frustum-shaped inner wall 230 of the first stationary contact 210 and the second stationary contact 220, accurately inserting into the gap at the initial stage of contact separation, forming a high-insulation physical barrier—directly cutting off the arc path, compressing the ionization channel, and enhancing heat dissipation, so that the arc is forcibly divided and extinguished at the budding stage, especially effectively suppressing the continuous arcing when the small current is interrupted. When the circuit is closed, the moving contact assembly 300 resets upward, pushing the insulation barrier assembly to move upward and exit the gap; the two insulators 420 are synchronously retracted under the constraint of the guide member 440, and the first elastic telescopic member 430 maintains the contact force to ensure that the insulators 420 are in contact with the moving contact assembly 300, completely avoiding the closed contact surface of the moving contact and stationary contact cone structure, so as to achieve interference-free conduction and reliable reset.

[0045] It should be noted that the insulator 420 can be made of alumina ceramic, silicon nitride ceramic, mica composite material or modified arc-resistant engineering plastic, etc., which are materials that can block electric arcs.

[0046] In some possible implementations, the elastic telescopic structure 410 is a compression spring, a disc spring assembly, or a silicone elastomer. The compression spring can be a stainless steel helical spring or a helical spring with an insulating layer on its surface.

[0047] In some possible implementations, two insulators 420 are arranged opposite to each other or nested together, and the two insulators 420 have receiving cavities 421 for accommodating the first elastic telescopic member 430.

[0048] Specifically, cylindrical blind holes are opened at the center of the opposite end faces of the two insulators 420 to serve as receiving cavities 421; the two ends of the first elastic telescopic member 430 are respectively embedded in the blind holes of the two insulators 420 and abut against the bottom of the holes; the two insulators 420 are arranged opposite each other in the horizontal direction, and the outer side wall slides in fit with the inner cavity of the outer shell 100; during assembly, the two insulators 420 are initially in a closed state. When the arc-extinguishing blocking mechanism 400 moves down to the opening critical position with the follower contact assembly 300, the first elastic telescopic member 430 pushes the two insulators 420 to expand outward synchronously along the guide rod 442. The arc-shaped working surface of the outer side of the insulator 420 (the radius of curvature matches the frustum-shaped inner wall 230) precisely fits the first stationary contact 210 and the second stationary contact 220 to form a continuous and seamless insulating barrier, effectively blocking the arc path, while avoiding motion interference and dust accumulation, ensuring the reliability and repeatability of the arc-extinguishing action.

[0049] In other embodiments, one of the two insulators 420, in addition to having a cylindrical blind hole, also has an annular sleeve extending from the blind hole, which can extend into the blind hole of the other insulator 420, so that the two insulators 420 are always connected and the first elastic telescopic member 430 is completely surrounded.

[0050] In some possible implementations, such as Figure 4 As shown, the guide member 440 includes a connector 441 inserted into the elastic telescopic structure 410 and a guide rod 442 laterally fixed to the connector 441. The two ends of the guide rod 442 are respectively movably inserted into two insulators 420.

[0051] Specifically, the connector 441, which is inserted into the truncated cone portion of the elastic telescopic structure 410, serves a positioning function. The bottom of the truncated cone has a protrusion, and the guide rod 442 passes through the protrusion with an interference fit, or the connector 441 and the guide rod 442 are integrally formed. Correspondingly, the opposite sides of the two insulators 420 have grooves to accommodate the protrusion and the guide rod 442. During operation, during the opening phase, the elastic telescopic structure 410 drives the connector 441 and the guide rod 442 to move downward as a whole. At the same time, the thrust of the first elastic telescopic component 430 causes the two insulators 420 to slide precisely along the guide rod 442 to fit against the truncated cone-shaped inner wall 230, instantly constructing a continuous insulating barrier to block the electric arc; during closing, it resets in the reverse direction.

[0052] It should be noted that connector 441 may be made of stainless steel or alumina ceramic, but is not limited to these.

[0053] In some possible implementations, the two insulators 420 are combined to form a frustum or ellipse.

[0054] Specifically, the outer wall of the insulator 420 matches the frustoconical inner wall 230 of the first stationary contact 210 or the second stationary contact 220. When the two insulators 420 are combined to form a frustum, the insulator 420 does not protrude from the frustoconical inner wall 230; when the two insulators 420 are combined to form an elliptical frustum, the insulator 420 does not protrude from the frustoconical inner wall 230, but does not exceed the first stationary contact 210 and the second stationary contact 220, thereby extending the insulating coverage of the insulator 420 and improving the arc extinguishing effect.

[0055] In some possible implementations, such as Figure 3 As shown, the housing 100 has a conical cavity 111 near the stationary contact assembly 200, which guides the two insulators 420 to close together when the circuit is closed.

[0056] Specifically, the inner wall of the outer casing 100 is provided with a conical cavity 111 that matches the contour of the insulator 420 (its cone angle is slightly greater than or equal to the outer cone angle of the frustum / elliptic formed after the two insulators 420 are joined together). When the contactor performs the closing action, the moving contact assembly 300 moves upward and pushes the arc-extinguishing blocking mechanism 400 to move upward as a whole, and the two insulators 420 enter the conical cavity 111. The inner wall of the conical cavity 111 applies a radial constraint force to the outer side of the two insulators 420, and under the guidance of the guide rod 442, it forces the two to overcome the thrust of the first elastic telescopic member 430 and move towards the center synchronously, so as to achieve precise and stable reassembly. In this way, not only is it ensured that the insulator 420 is completely out of the stationary contact gap in the non-working state (when the circuit is closed) to avoid interfering with the conduction of the main circuit, but the self-centering effect of the conical cavity 111 also eliminates assembly tolerances and movement deviations, ensuring that the insulator 420 is in the preset initial position before each circuit breaker trips, thereby improving the consistency and reliability of the arc extinguishing action.

[0057] In some possible implementations, the first elastic telescopic member 430 is a compression spring, a disc spring assembly, or a silicone elastomer. The compression spring can be a stainless steel helical spring or a helical spring with an insulating layer on its surface.

[0058] In some possible implementations, the housing 100 includes a detachably connected first housing 110 and a second housing 120, the second housing 120 being connected to the cylinder 510, and the lateral dimension of the inner cavity of the second housing 120 being 2 to 5 times the lateral dimension of the rod 530.

[0059] Specifically, the first housing 110 and the second housing 120 are connected by screws, clips, or flanges to achieve quick assembly and disassembly, facilitating maintenance, contact replacement, or pneumatic system repair. The lateral dimension of the inner cavity of the second housing 120 is 2 to 5 times the lateral dimension of the rod 530, providing sufficient guiding space for the reciprocating motion of the rod 530 while avoiding jamming caused by assembly errors or thermal expansion.

[0060] In some possible implementations, the contactor also includes a drive device for driving the moving contact assembly 300. The drive device can be electromagnetic (e.g., a coil-armature mechanism), permanent magnet, or a motor drive mechanism, and its output is connected to the insulating fixed head 310 of the moving contact assembly 300 via a linkage, push rod, or direct coupling.

[0061] In some possible implementations, the driving device is a pneumatic assembly 500, which includes a cylinder 510, a piston 520, and a rod 530. The rod 530 is connected to the moving contact assembly 300, and the movement of the rod 530 drives the moving contact assembly 300. An insulating fixed head 310 is connected.

[0062] Specifically, when an external control air source supplies air to one side of the cylinder 510, the air pressure pushes the piston 520 to move axially, causing the rod 530 to extend and retract synchronously, thereby driving the insulating fixed head 310 and the moving contact body 320 nested therein to move as a whole. When closing, the rod 530 advances, so that the frustum-shaped outer wall of the moving contact body 320 is tightly fitted with the frustum-shaped inner wall 230 of the stationary contact assembly 200 to achieve conduction. When opening, the air circuit is switched or depressurized, the piston 520 retracts under the action of the return spring or reverse air pressure, and the rod 530 pulls the moving contact assembly 300 to quickly disengage from the stationary contact, while simultaneously driving the insulating barrier assembly of the upper arc-extinguishing barrier mechanism 400 to move down and insert into the gap synchronously.

[0063] In some possible implementations, the cylinder 510 is sealed to the housing 100, and the inner cavity of the housing 100 is a vacuum chamber 130.

[0064] Specifically, the cylinder body 510 and the outer shell 100 are connected in an airtight manner through a sealing ring or sealant, and the entire inner cavity of the outer shell 100 is evacuated and maintained at a high vacuum (10). -3 Pa~10 -7 The vacuum arc extinguishing environment is formed by the vacuum (Pa), and the arc generated by the contact separation in the vacuum is naturally and quickly extinguished due to the lack of medium. Together with the arc extinguishing and blocking mechanism 400, it forms a dual guarantee of "vacuum arc extinguishing + active isolation".

[0065] In some possible implementations, the pneumatic assembly 500 also includes a second elastic telescoping member 540 for assisting in the reset of the piston 520.

[0066] Specifically, the second elastic telescopic component 540 can be a compression spring, a disc spring assembly, or an elastic rubber element. One end of the component abuts against the end wall of the inner cavity of the cylinder 510, and the other end acts on one side of the piston 520. When the air source is switched or exhaust is performed, the second elastic telescopic component 540 releases its pre-stored elastic potential energy, actively pushing the piston 520 back to its initial position, thereby driving the rod 530 and the connected moving contact assembly 300 to quickly return to their original positions to complete the opening or closing action. In this way, the shortcomings of relying solely on reverse air supply or gravity reset, such as slow response and low reliability, are effectively compensated for. Especially under conditions of air pressure fluctuation, air supply delay, or air shortage, the contactor can still be reliably disconnected, improving safety redundancy. At the same time, the elastic reset force can buffer the impact at the end of the piston 520's movement, reducing mechanical noise and wear, and can work in conjunction with the pneumatic drive force to optimize the motion curve. For example, it can accelerate separation at the end of the opening stage to enhance arc extinguishing, and flexibly fit at the end of the closing stage to reduce bounce.

[0067] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0068] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A contactor, characterized in that, The device includes a housing (100), a stationary contact assembly (200), and a moving contact assembly (300). The stationary contact assembly (200) is disposed on the housing (100). The stationary contact assembly (200) includes a first stationary contact (210) and a second stationary contact (220) disposed opposite to each other. The first stationary contact (210) and the second stationary contact (220) each have a frustoconical inner wall (230) facing the moving contact assembly (300). The moving contact assembly (300) is provided with a frustum structure that cooperates with the frustum-shaped inner wall (230).

2. The contactor according to claim 1, characterized in that, The moving contact assembly (300) includes an insulating fixing head (310) and a moving contact body (320) nested in the insulating fixing head (310). The moving contact body (320) has a frustoconical outer wall that mates with the frustoconical inner wall (230). The two ends of the insulating fixing head (310) protrude from the two ends of the moving contact body (320).

3. The contactor according to claim 2, characterized in that, The frustum-shaped inner wall (230) is an incomplete conical surface, and the central angle of the directrix of the frustum-shaped inner wall (230) is 60°~135°.

4. The contactor according to any one of claims 1 to 3, characterized in that, The contactor also includes an arc-extinguishing isolation mechanism (400), which is disposed above the stationary contact assembly (200). The arc-extinguishing isolation mechanism (400) includes an elastic telescopic structure (410) and an insulating barrier component connected to the lower end of the elastic telescopic structure (410). During the opening process, the moving contact assembly (300) moves away from the stationary contact assembly (200). The insulating barrier component maintains contact with the moving contact assembly (300) under the elastic force of the elastic telescopic structure (410) and moves down synchronously, gradually inserting into the gap between the first stationary contact (210) and the second stationary contact (220) to physically isolate the arc generated during the opening. And / or, the contactor further includes a drive mechanism for driving the moving contact assembly (300).

5. The contactor according to claim 4, characterized in that, The insulating barrier assembly includes two insulators (420) disposed within the housing (100), a first elastic telescopic member (430) with its two ends respectively abutting against the two insulators (420), and a guide member (440) slidably engaged with the two insulators (420). The guiding direction of the guide member (440) is consistent with the telescopic direction of the first elastic telescopic member (430). The first elastic telescopic member (430) is used to push the two insulators (420) to respectively adhere to the first stationary contact (210) and the second stationary contact (220). And / or, the driving device is a pneumatic assembly (500), the pneumatic assembly (500) includes a cylinder (510), a piston (520) and a rod (530), the rod (530) is connected to the moving contact assembly (300), the rod (530) moves to drive the moving contact assembly (300), and the insulating fixing head (310) is connected; And / or, the elastic telescopic structure (410) is a compression spring, a disc spring assembly, or a silicone elastomer.

6. The contactor according to claim 5, characterized in that, The two insulators (420) are arranged opposite to each other or nested together, and the two insulators (420) have receiving cavities (421) for housing the first elastic telescopic member (430). And / or, the guide (440) includes a connector (441) inserted into the elastic telescopic structure (410) and a guide rod (442) laterally fixed to the connector (441), with the two ends of the guide rod (442) respectively movably inserted into the two insulators (420). And / or, the cylinder (510) is sealed to the outer shell (100), and the inner cavity of the outer shell (100) is a vacuum chamber (130).

7. The contactor according to claim 6, characterized in that, The two insulators (420) are combined to form a frustum or a frustum.

8. The contactor according to claim 7, characterized in that, The housing (100) has a conical cavity (111) near the stationary contact assembly (200) for guiding the two insulators (420) to close together when the circuit is closed; And / or, the first elastic telescopic member (430) is a compression spring, a disc spring assembly, or a silicone elastomer.

9. The contactor according to claim 8, characterized in that, The outer casing (100) includes a first casing (110) and a second casing (120) that are detachably connected. The second casing (120) is connected to the cylinder (510). The lateral dimension of the inner cavity of the second casing (120) is 2 to 5 times the lateral dimension of the rod (530). And / or, the pneumatic assembly (500) further includes a second elastic telescopic member (540) for assisting in pushing the piston (520) to reset.

10. The contactor according to claim 9, characterized in that, The second elastic telescopic component (540) is a compression spring, a disc spring assembly, or a silicone elastomer.

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