A sealing structure using a segmented static contact rod

Abstract

This invention discloses a sealing structure employing a segmented static contact rod. The invention sequentially forms a primary sealing layer and a secondary permanent sealing layer through vacuuming and filling with protective gas. Simultaneously, it utilizes a mounting base limiting structure, multi-layered adhesive sealing, and an interlocking reinforcement structure to construct a tertiary external protective seal, forming a multi-dimensional, multi-level three-dimensional sealing system. This overcomes the shortcomings of traditional structures, such as poor sealing reliability and easy leakage, effectively ensuring the long-term stability of the arc-extinguishing medium environment inside the arc-extinguishing chamber. It improves the operational stability and service life of high-voltage DC relays under high-frequency switching conditions. Furthermore, the structure has a reasonable layout, simple assembly process, and excellent structural deformation resistance and weather resistance, making it suitable for use in high-voltage, high-frequency applications such as new energy vehicles and industrial power control.

Description

Technical Field

[0001] This invention belongs to the field of electrical connector technology, specifically relating to a sealing structure employing a segmented stationary contact rod. Background Technology

[0002] High-voltage DC relays and their supporting electrical devices are widely used in new energy vehicles, power control and industrial equipment. Their contact components need to maintain a stable arc-extinguishing medium environment under high voltage and frequent switching conditions. The sealed arc-extinguishing cavity structure has higher requirements for the sealing reliability of the moving contact rod during reciprocating motion.

[0003] Existing contact assemblies rely on the cooperation of moving and stationary contacts to achieve switching, and the sealing structure between the moving contact and the arc-extinguishing chamber also ensures operation. However, due to the requirement that the moving contact must simultaneously meet the functional requirements of movement and sealing, existing structures typically have an injection port on the arc-extinguishing chamber. After the arc-extinguishing medium is injected into the chamber through the injection port, a sealing element is used to seal the injection port to complete the seal. However, because the diameter of the injection port is small, sealing is difficult, and medium leakage is prone to occur during long-term use. It is difficult to ensure the long-term stability of the medium environment inside the sealed arc-extinguishing chamber, which in turn affects the switching performance and service life of the high-voltage DC relay. Summary of the Invention

[0004] The purpose of this invention is to provide a sealing structure employing a segmented static contact rod that does not have at least one of the disadvantages mentioned above.

[0005] To achieve the above objectives, the present invention discloses a sealing structure employing a segmented stationary contact rod, comprising: An arc-extinguishing cover, one end of which is used for a sealed and movable connection with the moving contact rod assembly; A stationary contact rod, the stationary contact rod comprising an air intake rod and a sealing rod; A sealing element is used to achieve a primary seal between the stationary contact rod and the arc-extinguishing shroud; The contact section of the air intake rod is located inside the arc-extinguishing shroud, and the air intake section of the air intake rod is located outside the arc-extinguishing shroud and is sealed to the arc-extinguishing shroud. There is an air intake gap between the contact section and the arc-extinguishing shroud, and the end of the air intake section is provided with an air injection hole communicating with the air intake gap. The sealing element seals the air injection hole to form a primary seal between the stationary contact rod and the arc-extinguishing shroud; After the primary seal is formed, the intake rod and the sealing rod are sealed and fixed together to form a secondary seal.

[0006] As an alternative implementation, the seal includes a plug that blocks the vent hole to form a primary seal between the stationary contact rod and the arc-extinguishing shroud.

[0007] As an optional implementation, the seal includes an air inlet pipe fixed to the end of the air injection hole, and the sealing rod is provided with a sealing hole that mates with the air inlet pipe; The air inlet pipe allows for evacuation of the arc-extinguishing shroud and injection of protective gas. By clamping the end of the air inlet pipe away from the injection port, a primary seal is formed between the stationary contact rod and the arc-extinguishing shroud.

[0008] As an optional implementation, there is a gap between the sealing hole and the air intake pipe.

[0009] As an optional implementation, the upper end of the air injection hole is provided with a connecting hole, the diameter of the connecting hole is larger than the diameter of the air injection hole, and the air inlet pipe is sealed and fixed to the connecting hole by interference fit or brazing.

[0010] As an optional implementation, one of the intake rod and the sealing rod is provided with a protrusion, and the other is provided with a cavity that mates with the protrusion, so as to distribute the radial force between the intake rod and the sealing rod, thereby protecting the sealing performance of the secondary seal.

[0011] As an optional implementation, the air intake section is provided with an annular air distribution groove on the side near the arc extinguishing shroud. One end of the annular air distribution groove is connected to the air intake gap, and the other end is connected to the air intake column. The air intake direction of the air intake column points towards the end face of the arc extinguishing shroud.

[0012] As an optional implementation, it also includes a mounting base, the mounting base having a mounting cavity, and the arc-extinguishing cover being embedded in the mounting cavity; The air intake section is sealed and fixed to the end face of the arc extinguishing shroud by welding, and there is a first weld between the two. The mounting cavity is provided with an annular protrusion. The inner ring surface of the annular protrusion is fixed to the outer ring of the air intake section at the first weld by a sealant. The bottom of the annular protrusion is fixed to the end face of the arc extinguishing cover at the first weld by a sealant, so as to form a three-level seal to prevent leakage at the first weld.

[0013] As an optional implementation, the intake rod and the sealing rod are fixed by welding to form the secondary seal, and a second weld seam exists between them; The mounting cavity has a glue-limiting protrusion at the top, and a glue-limiting groove exists between the glue-limiting protrusion and the stationary contact rod. The glue-limiting groove is filled with a first sealant layer, and the height of the first sealant layer is higher than the second weld. The annular protrusion is located at the bottom of the first sealant layer.

[0014] As an optional implementation, a first ring and a second ring are respectively provided on the outer edge of the air intake section and the sealing rod. The first ring is located between the first weld and the second weld, and the second ring is located above the second weld. Both the first ring and the second ring are inserted into the interior of the first sealing layer.

[0015] As an optional implementation, the outer ring of the arc-extinguishing shroud is fixed to the inner wall of the mounting cavity by sealant.

[0016] As an optional implementation, a recessed platform is provided at the outer edge of the end of the arc extinguishing cover, and there is a cavity between the recessed platform and the mounting cavity. The mounting base is provided with an injection hole that communicates with the cavity, through which a second sealant layer can be filled into the cavity.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention splits the traditional one-piece static contact rod into an air inlet rod and a sealing rod, and uses the static contact rod body to construct a built-in inflation channel, abandoning the existing sealing structure of opening the arc extinguishing hood for air injection. At the same time, it adopts a step-by-step multi-stage sealing process. First, the arc extinguishing chamber is evacuated and protective gas is injected through the air injection hole. The sealing element forms a first-level seal. Then, the air inlet rod and the sealing rod are sealed and fixed to form a second-level seal. The double-layer seal provides layer-by-layer protection, sealing off the inflation leakage channel, effectively solving the problem of medium leakage that is prone to occur in the traditional sealing structure, and ensuring the long-term stability of the arc extinguishing medium environment inside the arc extinguishing chamber. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a partial cross-sectional view of the sealing element being the intake pipe; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a partial cross-sectional view of the sealing element, which is a plug.

[0020] Explanation of key figure labels: 1. Stationary contact rod; 101. Inlet rod; 102. Sealing rod; 1021. Inlet section; 1022. Contact section; 103. Inlet gap; 104. Annular air distribution groove; 105. Adhesive limiting protrusion; 106. Sealing hole; 107. Inlet pipe; 108. Plug; 109. Air injection hole; 110. Recessed platform; 111. Protruding column; 2. Mounting base; 201. Mounting cavity; 3. Arc extinguishing cover; 4. Moving contact rod assembly. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to include a specific orientation, or to be constructed and operated in a specific orientation.

[0023] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0025] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0026] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0027] Please see Figures 1-3As shown, this application embodiment provides a sealing structure using a segmented stationary contact rod, including an arc-extinguishing cover 3. The arc-extinguishing cover 3 constitutes the sealed arc-extinguishing cavity of the relay, providing a closed working environment for the contact switching and arc extinguishing. One end of the arc-extinguishing cover 3 is used for a sealed and movable connection with the moving contact rod assembly 4, which not only meets the high-frequency reciprocating switching motion requirements of the moving contact rod assembly 4, but also ensures the dynamic sealing performance of the end of the arc-extinguishing cavity, preventing external air and impurities from entering the cavity. In addition, the sealed and movable connection can adopt existing common methods, which will not be described in detail here. The stationary contact rod 1 adopts a segmented split structure, specifically including an air inlet rod 101 and a sealing rod 102 that are assembled together, abandoning the traditional one-piece solid stationary contact rod 1 structure, which can realize the integrated design of cavity inflation and sealing. The sealing element is used to achieve the first-level sealing between the stationary contact rod 1 and the arc-extinguishing cover 3. The lower end of the air intake rod 101 is a contact section 1022, which is located inside the arc-extinguishing chamber 3 and is used to contact the moving contact rod assembly 4 to achieve the conduction and disconnection of the high-voltage circuit. The upper end of the air intake rod 101 is an air intake section 1021, which extends to the outside of the arc-extinguishing chamber 3 and is sealed and fixedly connected to the top end face of the arc-extinguishing chamber 3 to ensure that there is no air leakage gap at the connection between the air intake rod 101 and the arc-extinguishing chamber 3. An annular air intake gap 103 is reserved between the outer wall of the contact section 1022 of the air intake rod 101 and the inner wall of the arc-extinguishing chamber 3. A vertically penetrating air injection hole 109 is opened at the top end of the air intake section 1021. The air injection hole 109 is interconnected with the air intake gap 103 at the lower end to form an integrated air-filling guide channel that penetrates the stationary contact rod 1. During the assembly and production process, the air intake hole 109 and the air intake gap 103 can be used to ventilate the arc-extinguishing chamber 1. The internal cavity of the closed arc-extinguishing chamber 3 is evacuated, and arc-extinguishing protective gas is injected into the cavity in a measured amount. After the gas replacement and filling of the cavity is completed, the gas injection hole 109 is sealed by a sealing element to block the communication path between the cavity and the outside world, so as to form a primary seal between the stationary contact rod 1 and the arc-extinguishing chamber 3. After the primary seal is completed and the internal gas pressure of the cavity is stabilized, the top end of the air inlet rod 101 is aligned with the bottom end of the sealing rod 102 and sealed and fixed. The sealing rod 102 completely covers and wraps the gas injection hole 109 and the sealing element sealing structure to form a full-coverage secondary permanent seal, eliminating the leakage hazard left by the gas filling channel. Therefore, this embodiment adopts double-layer sealing for protection, sealing the gas filling leakage channel, effectively solving the problem that traditional sealing structures are prone to medium leakage under high pressure, high frequency vibration, and temperature difference alternating conditions, and ensuring the long-term stability of the arc-extinguishing medium environment inside the arc-extinguishing chamber.

[0028] In other embodiments, please refer to Figure 3As shown, the sealing element is in the form of a plug 108, which blocks the air injection port 109 to form a primary seal between the stationary contact rod 1 and the arc-extinguishing cover 3. Therefore, this invention integrates the air intake and ventilation structure onto the stationary contact rod 1, breaking away from the structural limitations of traditional arc-extinguishing cover 3 with its main body opening. Traditional arc-extinguishing cover 3 is constrained by the strength of the cavity structure, wall thickness, and overall assembly layout, limiting the design of the air injection port diameter to a small size, which easily leads to problems such as poor ventilation, difficulty in sealing, and seal failure. In contrast, this invention relies on the independent structural space of the segmented stationary contact rod 1, allowing the diameter of the air injection port 109 to be flexibly and reasonably increased according to inflation requirements and sealing processes, without sacrificing the overall structural strength. A larger vent diameter effectively reduces airflow resistance during vacuuming and protective gas filling, improves gas replacement efficiency within the cavity, and ensures more uniform gas filling and a higher vacuum level. Simultaneously, the larger vent diameter provides more uniform stress on the sealing surface, and the plug 108 offers ample space for assembly and alignment, reducing the difficulty of the sealing process. This effectively avoids the defects of small-hole plugs, such as misalignment, poor fit, and leakage through micro-gap, further improving the sealing reliability and production yield of the arc-extinguishing cavity from a structural perspective. In this embodiment, a sealing hole 106 can also be provided on the sealing rod 102 to prevent the plug 108 from being too long (which facilitates the sealing of the injection hole 109) and interfering with the sealing rod 102.

[0029] In other embodiments, please refer to Figures 1-2 As shown, the sealing element is the air inlet pipe 107, which is fixed to the end of the air injection port 109. The air inlet pipe 107 can be made of copper. A sealing hole 106 corresponding to the air inlet pipe 107 is vertically opened at the center of the sealing rod 102. The sealing hole 106, the air inlet pipe 107, and the air injection port 109 are vertically coaxially aligned to ensure that the airflow path is straight and regular, avoiding airflow turbulence and inflation deviation, and improving the uniformity and stability of gas replacement in the cavity. During operation, external vacuuming equipment and inflation equipment can be directly connected to the outer end of the air inlet pipe 107. Through the through channel formed by the air inlet pipe 107 and the air injection port 109, the vacuuming and impurity removal and quantitative filling of the arc-extinguishing protective gas inside the sealed cavity of the arc-extinguishing hood 3 can be successfully completed. Subsequently, in this embodiment, the end of the air inlet pipe 107 facing away from the air injection port 109 is clamped, and the port of the air inlet pipe 107 is sealed by the extrusion deformation of the pipe material, thereby forming a primary seal between the stationary contact rod 1 and the arc extinguishing cover 3. The diameter of the sealing hole 106 is larger than the outer diameter of the air inlet pipe 107, ensuring that a small fitting gap is always maintained between the inner wall of the sealing hole 106 and the outer wall of the air inlet pipe 107. This effectively offsets assembly alignment errors and the extrusion stress generated by high-temperature welding deformation, avoiding structural damage caused by hard contact impacts, and does not affect the subsequent formation of the permanent sealing structure.

[0030] Please see Figures 1-3As shown, the upper end of the air injection port 109 is provided with a connecting hole for installation. The diameter of the connecting hole is larger than that of the air injection port 109, forming a stepped hole structure between the connecting hole and the air injection port 109. This stepped expansion structure can increase the assembly contact area between the air intake pipe 107 and the air intake rod 101, improving the connection stability of the air intake pipe 107. At the same time, the air intake pipe 107 can be sealed and fixed to the inner wall of the connecting hole through two fixing methods: interference fit or brazing, adapting to different production processes and assembly scenarios. Among them, the interference fit can achieve a tight fit without gaps by structural extrusion, without the need for additional auxiliary materials, resulting in high assembly efficiency and good structural integrity. The brazing method can fill the connection gap, achieving a metal integrated sealing connection, with stronger airtightness, better high temperature resistance and vibration resistance. Both fixing methods can completely seal the tiny gaps at the connection between the air intake pipe 107 and the air intake rod 101, avoiding micro-leakage at the connection position of the inflation channel, and ensuring the airtightness and integrity of the inflation channel of the arc extinguishing chamber.

[0031] In one embodiment, a positioning structure is provided between the mating end faces of the intake rod 101 and the sealing rod 102. Specifically, an integral protrusion 111 is provided on either end face of the intake rod 101 or the sealing rod 102, and a cavity matching the shape and size of the protrusion 111 is opened on the other corresponding end face, so that the intake rod 101 and the sealing rod 102 can achieve concave-convex fitting positioning during assembly. During the process of welding the two rods to form a secondary seal, and during the actual operation of the relay under long-term high voltage, high frequency switching, and mechanical vibration, the stationary contact rod 1 is susceptible to multi-dimensional radial shear force, lateral extrusion force, and stress caused by assembly misalignment. This fitting positioning structure can effectively bear and distribute most of the radial force, avoid the butt weld and the sealing joint surface from directly bearing concentrated loads, and effectively prevent failure problems such as micro-deformation, micro-cracks, misalignment, and loosening of the secondary seal weld. Meanwhile, this structure enables rapid coaxial alignment of the two rod sections, effectively avoiding uneven sealing surface fit caused by assembly misalignment, significantly improving the forming accuracy and structural integrity of the secondary sealing structure, ensuring the airtightness and structural stability of the secondary seal for a long time, avoiding leakage of the arc-extinguishing medium caused by structural deformation under stress, and continuously protecting the overall sealing performance.

[0032] In one embodiment, an annular gas distribution groove 104 is circumferentially formed on the outer side of the bottom end of the air intake section 1021 near the arc-extinguishing shroud 3. The annular gas distribution groove 104 adopts a surrounding groove structure design, which is arranged around the outer circumference of the air intake rod 101, which can effectively disperse the concentrated airflow and evenly distribute and guide the air. The inner groove passage of the annular gas distribution groove 104 is interconnected with the air intake gap 103, and the outer guiding passage is connected to the air intake column, forming a gas distribution and guiding structure from the air injection hole 109, the air intake column, the annular gas distribution groove 104 to the air intake gap 103. The air intake and exhaust direction of the air intake column is vertically pointed to the inner end face of the arc-extinguishing shroud 3, so that the protective gas introduced through the air intake channel can first impact the end face of the arc-extinguishing shroud 3, and then evenly diffuse along the annular gas distribution groove 104 and slowly fill the entire internal space of the arc-extinguishing chamber from top to bottom. This structure improves upon the problems of concentrated airflow, excessively high local pressure, and dead zones and vacuum residue at the corners of the cavity caused by the traditional single-point direct-blowing inflation method. It can effectively slow down the intake airflow velocity and disperse the airflow pressure, achieving a uniform and sufficient gas replacement effect throughout the arc-extinguishing cavity. This significantly improves the uniformity of the filling of the arc-extinguishing protective gas and the consistency of the vacuum degree within the cavity, ensuring uniform medium pressure and gas concentration throughout the arc-extinguishing cavity. It provides a stable and balanced sealed medium environment for high-frequency arc extinguishing of the contacts, effectively improving the overall arc-extinguishing performance and operational stability of the relay.

[0033] In one embodiment, a mounting base 2 is also included. The mounting base 2 is an integral load-bearing protective structure. The mounting base 2 has an internally configured mounting cavity 201. The arc-extinguishing cover 3 is integrally embedded and limited inside the mounting cavity 201. The mounting cavity 201 achieves the positioning and fixation of the overall structure of the arc-extinguishing cover 3 and external protection, effectively improving the assembly integration and impact resistance of the overall structure and preventing internal structural displacement and shaking during relay operation. The bottom end face of the air inlet section 1021 and the top end face of the arc-extinguishing cover 3 are sealed and fixed by welding, forming a stable structure between the air inlet rod 101 and the arc-extinguishing cover 3. After welding, the connection point of the two forms a first annular weld, thus achieving basic end-face sealing. However, the first weld formed by the welding process is prone to defects such as micro-pores, sand holes, and micro-cracks that are invisible to the naked eye. Under the conditions of high pressure, temperature alternation, and long-term mechanical vibration, these micro-defects will gradually expand, leading to micro-leakage of the medium and compromising the airtightness of the arc-extinguishing cavity. To this end, an annular protrusion with a ring structure is integrally formed on the inner side of the mounting cavity 201. This annular protrusion forms a protective enclosure. The inner ring surface of the annular protrusion is arranged to fit against the outer ring wall surface of the air intake section 1021, and the two are tightly sealed together by filling with sealant. At the same time, the bottom end face of the annular protrusion completely covers the first weld area and is simultaneously bonded and cured with sealant to the end face of the arc extinguishing cover 3 and the end face of the air intake section 1021 at the first weld. Through the three-dimensional enclosure structure of the annular protrusion and the sealant filling, potential gaps and defect channels of the first weld can be wrapped and sealed, specifically compensating for the inherent deficiencies of the weld seal, constructing a reliable three-level sealing structure, isolating the leakage path of the first weld from the outside, effectively avoiding the problem of micro-leakage of the weld, and further improving the redundancy and long-term stability of the overall seal of the arc extinguishing cavity.

[0034] After the intake rod 101 and sealing rod 102 are aligned and assembled, they are fixedly connected by welding. The joint of the rods is welded and fused to form a dense secondary sealing structure, thereby sealing the internal inflation channel and blocking the leakage path of the medium. A second weld seam is formed at the welded joint of the two rod sections. This second weld seam is the core stress-bearing and sealing position of the secondary seal, and it is also the weakest area of ​​the overall sealing system that is most susceptible to environmental influences and stress damage. To specifically enhance the sealing protection capability of the second weld seam, an annular adhesive limiting protrusion 105 is integrally formed on the top of the mounting cavity 201. The adhesive limiting protrusion 105 is arranged circumferentially around the outer side of the stationary contact rod 1, so that the inner side wall of the adhesive limiting protrusion 105 and the outer side wall of the stationary contact rod 1 form an annular sealed adhesive limiting groove, which can limit the filling area and forming range of the sealant, effectively preventing assembly defects such as random flow of adhesive, overflow accumulation, and uneven thickness of adhesive layer during the injection process, and ensuring the accuracy of adhesive injection forming. The sealing groove is filled with a first sealant layer, and the overall filling height of the first sealant layer is completely higher than the vertical height of the second weld. This allows the second weld to be entirely embedded within the first sealant layer, achieving all-around, seamless sealing protection. This effectively isolates the second weld from external moisture, air, dust, and alternating high and low temperature environments, preventing erosion and damage. It also buffers shear stress caused by operational vibrations, avoiding weld failures such as micro-cracks and detachment. The annular protrusion protecting the first weld is positioned at the bottom of the first sealant layer, providing stable vertical support and positioning for the upper sealant layer. This prevents the sealant layer from sinking, detaching, or cracking over long-term use, ensuring the hierarchical stability and long-term airtightness of the double-layer weld sealing structure.

[0035] In one embodiment, a first ring and a second ring with annular structures are respectively provided on the outer edge of the air intake section 1021 and the outer edge of the sealing rod 102, with the two ring structures arranged vertically and horizontally along the axial direction of the stationary contact rod 1. The first ring is positioned on the outer wall of the rod between the first and second welds, providing restraint and reinforcement to the middle sealing area. The second ring is positioned on the outer wall of the rod above the second weld, providing restraint and wrapping to the top sealing area. The two rings form a complementary protective layout. After assembly and adhesive injection, the ring structures of both the first and second rings are completely embedded within the cured first sealant layer, forming a tight mechanically integrated structure with the sealant, changing the traditional method of pure adhesive surface bonding and relying solely on adhesive force for fixation. By utilizing the anchoring effect of the double-ring structure, the bonding strength and clamping force between the first sealing layer and the surfaces of the air intake rod 101 and sealing rod 102 can be significantly improved. This effectively resists the peeling and shear stresses generated by the long-term high-frequency vibration and alternating hot and cold deformation of the relay, preventing sealing failures such as peeling, detachment, cracking, and slippage of the sealing layer. Simultaneously, the double-ring layered embedding structure effectively enhances the overall structural stability of the sealing layer, preventing localized voids and delamination. This ensures the continuous full coverage and protection of the second weld seam by the first sealing layer, further improving the overall sealing system's anti-aging capabilities and long-term airtightness.

[0036] In one embodiment, the outer periphery of the arc-extinguishing cover 3 and the inner wall of the mounting cavity 201 are sealed and fixed together by a full-coverage adhesive injection bonding method. By filling the entire circumference of the arc-extinguishing cover 3 with sealant and curing it, the outer wall of the arc-extinguishing cover 3 and the inner wall of the mounting cavity 201 are tightly fitted into an integral structure. This annular full-area sealing structure can seal the assembly gap between the outer wall of the arc-extinguishing cover 3 and the inner wall of the mounting cavity 201, preventing external moisture, dust, and air from entering the internal structure through the gap in the side wall, and compensating for minor assembly gap defects in mechanical assembly. At the same time, the circumferential sealant layer can play a role in buffering, shock absorption, and insulation protection, absorbing the mechanical vibration generated during the operation of the relay, avoiding structural wear and loosening caused by hard collision between the arc-extinguishing cover 3 and the mounting base 2, effectively improving the overall installation firmness and positional stability of the arc-extinguishing cover 3, and forming a side-encircling sealing barrier in conjunction with the aforementioned multi-level sealing structure, further improving the three-dimensional sealing protection system of the whole machine.

[0037] The bottom end of the arc-extinguishing cover 3 has an integrally machined recessed platform 110 structure. The outer wall of the arc-extinguishing cover 3, the stepped surface of the recessed platform 110, and the inner wall of the mounting cavity 201 form an annular cavity structure, which is a reserved space for glue injection molding. The side wall of the mounting base 2 has through-hole glue injection holes corresponding to the cavity position. The glue injection holes are connected to the inside of the annular cavity. The glue injection holes not only have the function of subsequent glue injection molding, but also have the function of pressure relief and air venting during assembly. During the process of pressing the arc-extinguishing cover 3 into the mounting cavity 201, the inside of the mounting cavity 201 is a relatively closed space. Rapid insertion can easily cause the air in the cavity to be rapidly compressed and accumulated, generating local high-pressure airflow. This can easily squeeze and disperse the pre-coated sealant on the outer ring of the arc-extinguishing cover 3 from the assembly gap between the arc-extinguishing cover 3 and the mounting cavity 201, resulting in assembly defects such as uneven thickness of the sealant layer on the side wall, insufficient sealant, and delamination, affecting the sealing effect of the side wall. This structure allows the cavity to communicate with the outside environment through the injection hole. During assembly, excess air squeezed inside the mounting cavity 201 can be discharged in real time, balancing the air pressure inside and outside the cavity, effectively eliminating assembly air squeezing pressure, preventing the sealant from being squeezed out by air pressure and ensuring the integrity and uniformity of the sealant layer on the outer ring sidewall. After the arc-extinguishing cover 3 is assembled and the air pressure is balanced, the second sealant layer is quantitatively and evenly filled into the cavity through the injection hole using an external injection device. After the sealant is completely cured, it can fill the entire cavity and fit all gap end faces, further achieving the sealing protection of the arc-extinguishing cover 3. At the same time, the cured second sealant layer can form a stable support and waterproof and moisture-proof protection for the bottom of the arc-extinguishing cover 3, effectively resisting the risk of sealing failure caused by bottom environmental erosion and vibration impact, and significantly improving the weather resistance and long-term reliability of the overall sealing system.

[0038] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A seal structure employing a segmented static contact stem, characterized by, include: Arc extinguishing cover (3), one end of which is used for a sealed and movable connection with the moving contact rod assembly (4); A stationary contact rod (1), the stationary contact rod (1) including an air intake rod (101) and a sealing rod (102); A sealing element is used to achieve a primary seal between the stationary contact rod (1) and the arc-extinguishing cover (3); The contact section (1022) of the air intake rod (101) is located inside the arc extinguishing cover (3), and the air intake section (1021) of the air intake rod (101) is located outside the arc extinguishing cover (3) and is sealed to the arc extinguishing cover (3). There is an air intake gap (103) between the contact section (1022) and the arc extinguishing cover (3). The end of the air intake section (1021) is provided with an air injection hole (109) communicating with the air intake gap (103). The seal will seal the air injection hole (109) to form a primary seal between the stationary contact rod (1) and the arc extinguishing cover (3); After the primary seal is formed, the intake rod (101) and the sealing rod (102) are sealed and fixed together to form a secondary seal.

2. The seal structure employing a segmented static contact stem according to claim 1, characterized by, The sealing element includes a plug (108) that blocks the air injection hole (109) to form a primary seal between the stationary contact rod (1) and the arc extinguishing cover (3).

3. The seal structure employing a segmented static contact stem according to claim 1, wherein, The sealing element includes an air inlet pipe (107), which is fixed to the end of the air injection hole (109), and the sealing rod (102) is provided with a sealing hole (106) that cooperates with the air inlet pipe (107). A primary seal is formed between the stationary contact rod (1) and the arc extinguishing cover (3) by clamping the end of the air inlet pipe (107) away from the air injection port (109).

4. The seal structure employing a segmented static contact stem according to claim 3, wherein, The upper end of the air injection hole (109) is provided with a connecting hole, the diameter of which is larger than the diameter of the air injection hole (109), and the air inlet pipe (107) is sealed and fixed to the connecting hole by interference fit or brazing.

5. The seal structure employing a segmented static contact stem of claim 1 wherein, One of the air intake rod (101) and the sealing rod (102) is provided with a protrusion (111), and the other is provided with a cavity that mates with the protrusion (111) to distribute the radial force between the air intake rod (101) and the sealing rod (102), thereby protecting the sealing performance of the secondary seal.

6. The seal structure employing a segmented static contact stem of claim 1, wherein, The air intake section (1021) is provided with an annular air distribution groove (104) on one side near the arc extinguishing cover (3). One end of the annular air distribution groove (104) is connected to the air intake gap (103), and the other end is connected to the air intake column. The air intake direction of the air intake column points to the end face of the arc extinguishing cover (3).

7. The seal structure employing a segmented static contact stem according to any one of claims 1 to 6, characterized in that, It also includes a mounting base (2), on which a mounting cavity (201) is provided, and the arc extinguishing cover (3) is embedded in the mounting cavity (201); The air intake section (1021) is sealed and fixed to the end face of the arc extinguishing cover (3) by welding, and there is a first weld between the two; The mounting cavity (201) is provided with an annular protrusion. The inner ring surface of the annular protrusion is fixed to the outer ring of the air inlet section (1021) at the first weld by sealant. The bottom of the annular protrusion is fixed to the end face of the arc extinguishing cover (3) at the first weld by sealant, so as to form a three-level seal to prevent leakage at the first weld.

8. The seal structure employing a segmented static contact stem according to claim 7, wherein, The intake rod (101) and the sealing rod (102) are fixed by welding to form the secondary seal, and there is a second weld between them; The mounting cavity (201) has a glue-limiting protrusion (105) at the top, and there is a glue-limiting groove between the glue-limiting protrusion (105) and the stationary contact rod (1). The glue-limiting groove is filled with a first sealant layer, and the height of the first sealant layer is higher than the second weld. The annular protrusion is located at the bottom of the first sealant layer.

9. The seal structure employing a segmented static contact stem according to claim 8, wherein, The air intake section (1021) and the sealing rod (102) are respectively provided with a first ring and a second ring. The first ring is located between the first weld and the second weld, and the second ring is located above the second weld. Both the first ring and the second ring are inserted into the interior of the first sealing layer.

10. The seal structure employing a segmented static contact stem of claim 7, wherein, The outer ring of the arc-extinguishing cover (3) is fixed to the inner wall of the mounting cavity (201) by sealant.

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