Fiber bundle perforation sealing protection structure suitable for electrical equipment cavity

Abstract

The invention discloses a fiber bundle perforation sealing protection structure suitable for an electrical equipment cavity, which relates to the technical field of electrical engineering, and comprises a protection shell mechanism, a fiber bundle, a small flange, a three-light mirror and a sealing system, the protective shell mechanism is used for being in sealed connection with a through hole of an electrical equipment cavity and providing external protection and comprises a metal flange and a protective box, and the metal flange is fixed to the through hole of the electrical equipment cavity through a bolt; according to the invention, the ZY-LOC high-pressure self-tightening flange is adopted to realize dynamic sealing when the fiber bundle passes through the internal and external interfaces of the electrical equipment, the TP347H stainless steel flange and the 35CrMoVA high-strength bolt are combined to ensure the structural stability in a high-temperature and high-pressure environment, and the high-precision coupling of the optical fiber and the camera is realized through the design of the three-light-mirror blind hole and the adjustable adapter ring. And a structural adhesive and sealing ring dual-sealing scheme is utilized, and multi-layer adhesive injection is performed on the optical fiber through hole, so that the sealing reliability and the anti-aging capability are enhanced, and gas leakage is effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical engineering, and particularly relates to a fiber bundle perforation sealing protection structure suitable for a cavity of an electrical device. BACKGROUND

[0002] With the development of electrical devices towards intelligence and high reliability, the signal transmission demand of internal state monitoring and external control system of the electrical devices is increasingly improved. As an ideal signal transmission medium, optical fiber bundles have been widely applied to internal and external signal connection of various electrical devices for transmitting image, data and other key information due to their advantages of anti-electromagnetic interference, high bandwidth, electrical insulation and the like.

[0003] However, when the optical fiber bundle is led out from the inside of the electrical device (usually a sealed cavity filled with insulating gas) to the external environment, it must pass through the internal and external interface of the device cavity. This passing process needs to open a perforation on the device shell, thereby raising a key technical problem, that is, how to ensure long-term and reliable sealing at the perforation (to maintain the airtightness of the internal environment of the device and prevent gas leakage or contamination) while not affecting or even optimizing the signal transmission performance of the optical fiber bundle itself.

[0004] In view of the protection requirement of the optical fiber bundle passing through the sealing interface, the following several traditional sealing protection technical schemes exist in the industry at present:

[0005] First, mechanical sealing technology. This technology mainly adopts O-ring, rubber pad and other elastic elements to press and seal between the optical fiber bundle and the perforation or the flange joint surface. The advantage is that the structure is relatively simple, easy to install and maintain. However, in the application scenarios where there is a high pressure difference in the electrical device or the internal and external media (such as insulating gas and air) have different characteristics, the traditional end face rubber seal is often difficult to completely prevent micro-leakage. In addition, the rubber material is prone to aging, hardening or cracking in a high temperature, high pressure or chemical environment for a long time, resulting in the decay of sealing performance over time and insufficient reliability.

[0006] Second, welding and brazing sealing technology. This technology melts the surface of the optical fiber bundle by metalizing treatment, and then melts it with the metal through-wall piece by welding or brazing process to realize permanent sealing. This method can theoretically provide extremely high sealing strength. However, its main challenge is that the process is complex and the cost is high: first, the brittle glass optical fiber needs to be treated with precise metalized coating; second, the high temperature stress generated in the welding process is easy to cause damage to the optical fiber or cracks at the connection due to the large difference in thermal expansion coefficient between the metal and the glass material, which has a reliability risk.

[0007] Third, resin and adhesive sealing technology. This technology uses adhesives such as epoxy resin to fill the gap between the optical fiber bundle and the hole, and forms a sealed body after curing. This method has good adaptability and can fill irregular gaps. However, its limitations are also obvious: most organic adhesives have limited high-temperature resistance, and their mechanical properties and sealing performance will decrease significantly in the continuous high-temperature working environment of electrical equipment; long-term exposure to harsh environments such as heat and humidity, ozone, etc. The glue is prone to aging, cracking or debonding from the base, and there is a risk of seal failure; in addition, its long-term stability and durability often cannot meet the long-term operation life requirement of high-reliability electrical equipment for decades.

[0008] In summary, the mechanical sealing, welding sealing and resin sealing schemes in the prior art have different degrees of defects in pressure resistance and durability, process complexity and reliability, temperature resistance and aging resistance when applied to the specific scenario of sealing the optical fiber bundle hole of the cavity of the electrical equipment. Therefore, the present application proposes a fiber bundle hole sealing protection structure suitable for the cavity of electrical equipment. SUMMARY

[0009] The purpose of the present application is to provide a fiber bundle hole sealing protection structure suitable for the cavity of electrical equipment to solve the problem of different degrees of defects in pressure resistance and durability, process complexity and reliability, temperature resistance and aging resistance when applied to the specific scenario of sealing the optical fiber bundle hole of the cavity of the electrical equipment in the prior art.

[0010] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a fiber bundle hole sealing protection structure suitable for the cavity of electrical equipment, comprising a protective shell mechanism, a fiber bundle, a small flange, a three-mirror and a sealing system;

[0011] The protective shell mechanism is used to connect and seal with the hole of the cavity of the electrical equipment and provide external protection, which comprises a metal flange and a protective box, the metal flange is fixed by bolts at the hole of the cavity of the electrical equipment, and the end face is provided with a sealing groove, the protective box is coaxially fixed on the side of the metal flange away from the cavity, and the inside forms an installation channel through in the axial direction;

[0012] The three-mirror is coaxially assembled in the installation channel of the protective box, and the end facing the cavity is provided with an axially extending blind hole, the blind hole is used to accommodate and fix the end of the fiber bundle;

[0013] Further, the sealing system comprises:

[0014] The dynamic sealing part is realized by the metal flange, which comprises a sleeve, a sleeve joint and a T-shaped sealing ring, the sleeve joint is integrally formed with the metal flange, the sleeve is sleeved outside the sleeve joint, and the T-shaped sealing ring is embedded in the sealing groove, forming a high-pressure self-tightening sealing structure;

[0015] A static sealing part is formed by structural glue injected and solidified in the blind hole of the tri-prism, which fills the annular gap between the inner wall of the blind hole and the end of the fiber bundle and forms a sealing layer tightly bonded with the end of the fiber bundle through a multi-layer glue injection process;

[0016] An interface sealing part includes multiple sets of sealing rings respectively embedded at the threaded connection of the blind hole of the tri-prism, between the mounting surface of the protective shell mechanism and the cavity of the electrical equipment, and at the connecting surface of the protective box and external components.

[0017] Further, the small flange is nested outside the fiber bundle and fixedly connected with the metal flange, for tightly fixing the fiber bundle to ensure air tightness.

[0018] Further, the metal flange is a ZY-LOC high-pressure self-tightening flange made of TP347H stainless steel, and the bolt is made of 35CrMoVA.

[0019] Further, the end of the protective box is provided with a lens view angle recess, which is an inner tapered structure with a taper angle adapted to the imaging view angle of the fiber bundle to ensure that the imaging field of view is not blocked, and the outer surface of the protective box is provided with an electromagnetic shielding layer to form a metal shielding structure.

[0020] Further, the tri-prism includes a mirror body made of barium fluoride glass, the blind hole is axially provided in the mirror body, and threaded sleeves are arranged at both ends of the mirror body and are threadedly connected with the inner wall of the mounting channel of the protective box for fixing the tri-prism in the protective box.

[0021] Further, it further includes a standard camera C interface and an adjustable adapter ring, the standard camera C interface is an external adapter interface independent of the tri-prism, which is installed at the light path output end of the tri-prism away from the blind hole to form an external connection structure for light path transmission, and the adjustable adapter ring is coaxially assembled between the standard camera C interface and the tri-prism and forms an axially adjustable fitting relationship with the standard camera C interface for accurately adjusting the coupling distance between the end face of the fiber bundle and the target surface of the external camera.

[0022] Further, the structural glue is epoxy resin glue, which is injected into the perforation gap of the fiber bundle through a multi-layer glue injection process to sequentially complete bottom gap filling, middle sealing reinforcement, and surface protection packaging.

[0023] Further, it further includes a small cover plate, which is covered on the side of the metal flange facing the electrical equipment cavity, and the lamination surface of the small cover plate and the metal flange is sealed by the structural glue to form isolation protection between the air chamber inside and outside.

[0024] Further, the outer part of the fiber bundle is provided with a metal tube except the area adhered to the sealing ring and the structural adhesive.

[0025] The present application has the following advantages:

[0026] The present application sets a sealing system of dynamic sealing part, static sealing part and interface sealing part, uses ZY-LOC high pressure self-tightening flange to realize dynamic sealing when the fiber bundle passes through the interface inside and outside the electrical equipment, combines TP347H stainless steel flange and 35CrMoVA high-strength bolt to ensure the structural stability in high temperature and high pressure environment, realizes high-precision coupling of the optical fiber and the camera through three-mirror blind hole design and adjustable ring, and uses the structural adhesive + sealing ring double sealing scheme to inject glue in multiple layers at the optical fiber perforation position, enhances the sealing reliability and anti-aging ability, and effectively prevents gas leakage. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0028] Figure 1 The structural diagram of the protective shell mechanism of the fiber bundle perforation sealing protection structure suitable for the cavity of the electrical equipment in the present application;

[0029] Figure 2 The cross-sectional view of the protective shell mechanism in the present application;

[0030] Figure 3 The installation schematic diagram of the three-mirror design in the present application;

[0031] Figure 4 The structural schematic diagram of the three-mirror in the present application;

[0032] Figure 5 The sealing schematic diagram of the structural adhesive + sealing ring in the present application;

[0033] Figure 6 The structural schematic diagram of the three-mirror fixing small flange in the present application.

[0034] Explanation of reference signs:

[0035] 1, protective shell mechanism; 101, metal flange; 102, protective box; 103, sealing groove; 104, lens view angle recess; 105, metal shielding structure; 106, bolt;

[0036] 2, fiber bundle; 3, small flange;

[0037] 4, three-mirror; 401, blind hole; 402, threaded sleeve; 403, mirror body;

[0038] 5, structural glue; 6, sealing ring; 7, adjustable ring; 8, small cover plate. DETAILED DESCRIPTION

[0039] In order to make the technical personnel in the field better understand the technical solutions of the present application, the present application will be further described in detail below in conjunction with the drawings.

[0040] As shown in the accompanying Figure 1 to the accompanying Figure 6 drawings:

[0041] Example 1:

[0042] The present application provides a kind of fiber bundle perforation sealing protection structure suitable for electrical equipment cavity, including protection shell mechanism 1, fiber bundle 2, small flange 3, three-mirror 4 and sealing system;

[0043] Protection shell mechanism 1 is used to be connected with the perforation sealing of electrical equipment cavity and provides external protection, it includes metal flange 101 and protection box 102, metal flange 101 is fixed in the perforation of electrical equipment cavity by bolt 106, its end surface is equipped with sealing groove 103, protection box 102 is coaxially fixed on the side of metal flange 101 away from cavity, and inside it forms the installation channel along the axial through;

[0044] Three-mirror 4 is coaxially assembled in the installation channel of protection box 102, and the end thereof towards cavity is equipped with axially extending blind hole 401, blind hole 401 is used to accommodate and fix the end of fiber bundle 2;

[0045] Among them, sealing system includes:

[0046] Dynamic sealing part, realized by metal flange 101, it includes clamping sleeve, sleeve joint and T-shaped sealing ring, sleeve joint is integrally formed with metal flange 101, clamping sleeve is sleeved on the outside of sleeve joint, T-shaped sealing ring is embedded in sealing groove 103, and constitutes high-pressure self-tightening sealing structure;

[0047] Specifically, under the action of initial installation of prestress, the "lip" of the T-shaped sealing ring is pre-pressed against the end face of the butt joint sleeve. When the internal pressure of the system rises, the pressure will further act on the sealing ring, so that the pressing force between the lip of the sealing ring and the sealing surface continues to increase, thereby realizing the self-tightening effect of "the higher the pressure, the tighter the sealing", and significantly improving the sealing reliability under high pressure working conditions. The unique clamping sleeve structure can uniformly constrain the sealing ring in the 360° circumferential direction. This design not only makes the upper limit of the pressure-bearing capacity of the flange more accurate and predictable, but also greatly enhances the resistance of the flange to external force disturbances such as pipeline vibration and impact, thereby maintaining the stability of the sealing interface. The elastic deformation range of the sealing ring can be optimized by the taper angle of the lip. When the taper angle is designed reasonably (for example, so that the sealing efficiency η is within the ideal range), efficient sealing can be achieved within a wide pressure range, and the sealing efficiency η can be characterized as the relationship between the effective deformation of the sealing ring and the pressure. When the ratio is in an optimized state, excellent sealing effect can be achieved under lower pre-tightening force. The sealing ring and the sleeve are subjected to clamping force, and under the action of the sleeve, the clamping force is uniformly transmitted to the sealing ring through the taper surface of the sleeve. This uniform load distribution ensures that the sealing ring can maintain close and consistent contact with the sealing groove 103 of the metal flange 101 on the entire sealing surface, eliminating local leakage channels. When the pipeline system produces torsional or bending loads, the flange structure can effectively isolate the direct impact of these loads on the core sealing surface. The synergistic effect between the various components (such as the clamping sleeve, the sleeve, and the sealing ring) of the flange structure makes the sealing surface more compact under slight deformation, thereby maintaining the integrity of the seal.

[0048] The static sealing part is composed of a structural adhesive 5 injected and solidified in the blind hole 401 of the three-mirror 4, which fills the annular gap between the inner wall of the blind hole 401 and the end of the fiber bundle 2, and forms a sealing layer tightly bonded to the end of the fiber bundle 2 through a multi-layer injection process.

[0049] Specifically, the multi-layer injection process is specifically applied to the blind hole structure of the three-mirror, and combines the double-sided uniform injection technology. The structural adhesive 5 is mechanically matched at the threaded connection of the blind hole 401, the sealing ring mounting surface, etc., to realize reliable sealing connection between the insulating plate (not shown in the figure) and the cover plate, and between the cover plate and the cavity of the gas insulated switchgear. For the fiber bundle 2 penetrating through, the epoxy resin adhesive is accurately injected and multi-layer injected in the perforation gap of the fiber rod (i.e. the annular space between the inner wall of the blind hole 401 and the fiber bundle 2), and finally a complete and high-strength static sealing body is formed inside the three-mirror 4.

[0050] The double-sided recess uniform injection technology accurately and uniformly injects sealing glue into the specific recess structure pre-set on both sides of the fiber bundle 2 penetrating into the blind hole section.

[0051] The advantages are:

[0052] Significantly increase the effective sealing area and bonding strength: Compared with simple annular gap filling, precise glue injection in the pre-set grooves on both sides allows the liquid glue to wrap the fiber bundle surface more fully and fill the groove space. After the glue solidifies, a mechanical interlocking and large-area bonding structure is formed at the groove, greatly increasing the effective contact and bonding area between the fiber bundle and the solidified sealing glue, thereby significantly improving the reliability and peel strength of the static seal.

[0053] Optimize the stress distribution and structural integrity of the sealing layer: The uniformly injected glue forms a locally thickened reinforcement zone in the groove, making the thickness and mechanical distribution of the entire sealing glue layer more uniform in the circumferential direction. This greatly enhances the structural integrity and stress resistance of the sealing body, enabling it to more effectively resist uneven stresses caused by internal and external pressure differences, temperature changes, mechanical vibrations or impacts, thereby more reliably preventing gas micro-leakage and the intrusion of external contaminants such as moisture and dust.

[0054] Enhance long-term environmental stability and durability: The uniform, complete and mechanically interlocked glue layer provides more consistent protection and better resistance to factors such as humidity, ozone and chemical media in long-term operating environments. This effectively slows down the aging, cracking or debonding risk of the glue material itself, the fiber bundle 2 and the inner wall of the blind hole 401, ensuring that the fiber bundle maintains a persistent and stable sealing state for the design life of the electrical equipment for decades.

[0055] Improve process adaptability and maintainability: This technology has certain tolerance for the diameter tolerance and shape of the fiber bundle. By adjusting the size of the groove and the glue injection parameters, it can flexibly adapt to different product specifications and meet diverse sealing needs of equipment. At the same time, due to the uniform injection and regular shape of the glue layer, it is easier to evaluate the integrity of the sealing layer through visual or non-destructive testing methods during subsequent equipment maintenance, making it easier to detect potential defects and simplifying maintenance and inspection work.

[0056] The interface sealing part includes multiple sets of sealing rings 6, which are respectively embedded at the threaded connection of the blind hole 401 of the three-mirror 4, between the mounting surface of the protection shell mechanism 1 and the cavity of the electrical equipment, and at the connecting surface between the protection box 102 and the external component. Specifically, the interface sealing part can effectively compensate for the machining tolerance and assembly error, and can adapt to the size changes caused by certain vibration and temperature changes. It works with the dynamic sealing part and the static sealing part to form a complete sealing and protection system from the inside of the equipment cavity to the external environment, multiple levels, all directions, and no weak links. The dynamic sealing part withstands the main pressure, the static sealing part fixes and seals the fiber bundle 2 for a long time, and the interface sealing part blocks all possible auxiliary leakage channels, thereby ensuring the long-term air tightness of the electrical equipment cavity in high-pressure and harsh environments.

[0057] In an embodiment of the present application, the metal flange 101 is a ZY-LOC high-pressure self-tightening flange made of TP347H stainless steel. The flange is made of TP347H stainless steel, which has excellent thermal strength and intergranular corrosion resistance, and good welding performance, and can adapt to the high temperature and high pressure working environment of the high voltage electrical equipment cavity.

[0058] Specifically, the flange is preferably a ZY-LOC standard high-pressure self-tightening flange structure. ZY-LOC has the characteristics of stable operation and long service life, which is determined by the structure of the flange. Taking the high temperature resistance performance as an example: first, its self-tightening feature can compensate for the thermal stress caused by temperature difference. The higher the system temperature or pressure, the greater the sealing self-tightening force, which offsets the sealing relaxation caused by thermal expansion. Second, its structure has an excellent heat dissipation path. Heat is first transferred from the high-temperature pipeline to the sleeve, and then to the bolt 106, with the temperature decreasing in steps. For example, when the fluid temperature in the pipeline is 350℃, the temperature at the bolt 106 position can be significantly reduced to about 150℃ or so after passing through the heat dissipation path. This thermal decay effect greatly reduces the stress and deformation of the bolt 106 and the flange body due to thermal expansion and contraction, so that the flange can still maintain reliable sealing performance and structural strength in a high temperature environment, complementing the high temperature resistance of the TP347H stainless steel material itself.

[0059] Among them, it needs to be further described that the performance table of TP347H stainless steel is shown in the following table:

[0060]

[0061] Performance table of TP347H stainless steel

[0062] In an embodiment of the present application, the bolt 106 is made of 35CrMoVA. Specifically, since the structure is applied to the cavity of a gas insulated electrical device, the bolt 106 not only needs to provide sufficient initial pretightening force during installation, but also needs to resist external forces caused by internal gas pressure, temperature fluctuations and potential vibrations during long-term operation, and in particular needs to avoid the attenuation of pretightening force caused by high-temperature creep relaxation. As a low-alloy high-strength steel, 35CrMoVA has excellent comprehensive mechanical properties, good hardenability, and outstanding high-temperature strength and anti-relaxation ability;

[0063] Further, in order to verify the structural reliability of the material bolt 106 in the high-pressure self-tightening flange combination, a special stress analysis was conducted. The analysis results show that under the typical working load of the flange, the axial stress value of the bolt 106 is 155.7 MPa, the radial stress value is 31.52 MPa, and the tangential stress value is 100.67 MPa. These stress values are far below the yield strength and endurance strength limit of 35CrMoVA material at the corresponding working temperature, indicating that the bolt 106 has sufficient strength safety margin. Therefore, the use of 35CrMoVA material bolt 106 can ensure the long-term stable operation of the flange connection system in the high-pressure environment of the electrical device cavity. It effectively guarantees the application and maintenance of the initial pretightening force, is the key basic component to support the reliable sealing of the dynamic sealing part and prevent leakage caused by bolt 106 creep relaxation, and together with the TP347H stainless steel flange body forms a solid mechanical sealing frame that can withstand high temperature and high pressure.

[0064] Further, it needs to be further described that the performance parameters of 35CrMoVA bolt are shown in the following table:

[0065]

[0066] Performance table of 35CrMoVA stainless steel

[0067] In an embodiment of the present application, the structural adhesive 5 is epoxy resin adhesive, which is injected into the perforation gap of the fiber bundle 2 by a multi-layer injection process to sequentially complete the bottom gap filling, middle sealing reinforcement and surface protection packaging. Specifically, first, a small amount of epoxy resin adhesive is injected into the annular gap between the inner wall of the blind hole 401 and the end of the fiber bundle 2, ensuring that the glue flows uniformly along the gap, filling the small gap, and setting to lay the foundation for the overall sealing; after the bottom layer is cured, the epoxy resin adhesive is injected again to 2 / 3 of the depth of the blind hole 401, and the glue is stirred gently with a special tool to expel internal bubbles, and then set again to strengthen the density of the sealing layer and improve the anti-leakage ability; after the middle layer is cured, the epoxy resin adhesive is injected to the orifice of the blind hole 401, so that the glue liquid is flush with the end face of the blind hole 401, forming a complete protective packaging, and setting to isolate external moisture, dust and other pollutants;

[0068] In an embodiment of the present application, the end of the protective box 102 is provided with a lens view angle recess 104, which is an internal conical structure with a cone angle adapted to the imaging view angle of the fiber bundle 2, ensuring that the imaging field of view is not blocked, and the outer surface of the protective box 102 is provided with an electromagnetic shielding layer, forming a metal shielding structure 105. Specifically, the lens view angle recess 104 is an internal conical structure, which ensures that the imaging light cone of the fiber bundle 2 can completely pass through the recess without being physically blocked by the side wall of the protective box 102, thereby structurally eliminating the loss of field of view and ensuring that the optical image collected from the inside of the cavity can be transmitted to the external imaging device without loss. In addition, the metal shielding structure 105 can reflect or absorb the electromagnetic waves of the external space radiation, and isolate the weak electromagnetic radiation that may be generated during internal signal transmission, effectively suppressing electromagnetic interference and radio frequency interference, providing a "quiet" electromagnetic environment for internal precise optical signal transmission, and preventing signal quality from being degraded due to electromagnetic noise.

[0069] In an embodiment of the present application, the three-mirror 4 includes a mirror body 403 made of barium fluoride glass, a blind hole 401 is axially provided in the mirror body 403, and threaded sleeves 402 are arranged at both ends of the mirror body 403, which are threadedly connected with the inner wall of the mounting channel of the protective box 102, for fixing the three-mirror 4 in the protective box 102. Specifically, the core optical element mirror body 403 of the three-mirror 4 is made of barium fluoride glass, which has high transmittance, low dispersion and good chemical stability in a wide spectral range from ultraviolet to mid-infrared, and is suitable for multi-spectral imaging or sensing that may be involved in electrical equipment.

[0070] In an embodiment of the present application, a standard camera C interface and an adjustable adapter ring 7 are further included, the standard camera C interface is an external adaptive interface independent of the three-mirror 4, which is mounted at the light path output end of the three-mirror 4 away from the blind hole 401, forming an external connection structure for light path transmission, and the adjustable adapter ring 7 is coaxially arranged between the standard camera C interface and the three-mirror 4, and forms an axially adjustable fitting relationship with the standard camera C interface, for accurately adjusting the coupling distance between the end face of the fiber bundle 2 and the target surface of the external camera. Specifically, the standard camera C interface is provided in this structure, which is installed as an independent module at the light path output end of the three-mirror 4, seamlessly guiding the internal outgoing light signal to the external camera, and the adjustable adapter ring 7 is a key optical alignment component, which cooperates with the standard camera C interface through precise threads or bayonet structure, allowing axial fine adjustment, and by rotating the adjustable adapter ring 7, the air gap between the output end face of the fiber bundle 2 and the image sensor (target surface) of the external camera can be accurately changed. This adjustment is crucial for optimizing the light path coupling efficiency, eliminating aberrations and ensuring clear imaging of the outgoing light spot on the camera target surface, thereby maximizing the signal-to-noise ratio and image resolution of signal transmission, and adapting to the needs of different cameras or different working distances.

[0071] In one embodiment of the present application, a small cover plate 8 is further included, which covers the side of the metal flange 101 facing the electrical equipment cavity, and the contact surface of the small cover plate 8 and the metal flange 101 is sealed by the structural adhesive 5 to form a gas chamber inside and outside isolation protection. Specifically, any theoretically possible trace gas permeation path through the main sealing interface is further blocked, and a local protection of the flange connection area is formed inside the equipment cavity to prevent the possible conductive impurities, metal particles or abnormal arc inside from directly acting on the main sealing surface, thereby improving the sealing safety of the system in the case of extreme internal failure.

[0072] In one embodiment of the present application, the outer part of the fiber bundle 2 is sleeved with a metal tube except the area in contact with the sealing ring 6 and the structural adhesive 5. Specifically, the metal tube (not shown in the figure) provides mechanical protection for the fiber bundle 2 to prevent the fiber bundle 2 from being damaged due to bending, extrusion, friction or accidental impact during installation, use or maintenance. The metal tube also has certain flame-retardant and high-temperature-resistant effects, thereby improving the durability and safety of the entire transmission line in complex industrial environments.

[0073] Embodiment two:

[0074] This embodiment is basically the same as the previous embodiment, except that the small flange 3 is nested outside the fiber bundle 2 and fixedly connected with the metal flange 101, which is used to press and fix the fiber bundle 2 to ensure the air tightness. The specific implementation scheme is that the small flange 3 is designed with a through-hole structure that precisely matches the outer diameter of the fiber bundle 2, so that it can be closely nested outside the fiber bundle 2. The small flange 3 is uniformly provided with a plurality of screw mounting holes in the circumferential direction, which are fixedly connected with the metal flange 101 through screws. When the screws are tightened, an axial pressing force is generated to pull the small flange 3 towards the metal flange 101, thereby synchronously pressing the fiber bundle 2 nested in the small flange 3, and finally making the end part of the fiber bundle 2 stably contact with the blind hole 401 of the three-mirror 4 to form a mechanical fixed constraint, thereby ensuring the air tightness of the electrical equipment cavity.

[0075] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above figures and description are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A fiber bundle perforated sealing and protective structure suitable for the cavity of electrical equipment, characterized in that, It includes a protective outer shell mechanism (1), fiber bundle (2), small flange (3), three-color mirror (4), and sealing system; The protective housing mechanism (1) is used to make a perforated sealing connection with the electrical equipment cavity and provide external protection. It includes a metal flange (101) and a protective box (102). The metal flange (101) is fixed to the perforation of the electrical equipment cavity by bolts (106), and its end face is provided with a sealing groove (103). The protective box (102) is coaxially fixed to the side of the metal flange (101) away from the cavity, and an axially through installation channel is formed inside. The three-light mirror (4) is coaxially mounted in the installation channel of the protective box (102), and one end of it facing the cavity is provided with an axially extending blind hole (401), which is used to accommodate and fix the end of the fiber bundle (2).

2. The fiber bundle perforated sealing and protective structure for electrical equipment cavities according to claim 1, characterized in that, The sealing system includes: The dynamic sealing part is achieved by a metal flange (101), which includes a ferrule, a sleeve and a T-shaped sealing ring. The sleeve is integrally formed with the metal flange (101), the ferrule is sleeved on the outside of the sleeve, and the T-shaped sealing ring is embedded in the sealing groove (103) to form a high-pressure self-tightening sealing structure. The static sealing part is composed of structural colloid (5) injected and cured in the blind hole (401) of the three-light mirror (4). The structural colloid (5) fills the annular gap between the inner wall of the blind hole (401) and the end of the fiber bundle (2), and forms a sealing layer that is tightly bonded to the end of the fiber bundle (2) through a multi-layer injection process. The interface sealing part includes multiple sets of sealing rings (6), which are respectively embedded in the blind hole (401) threaded connection of the three-light mirror (4), between the mounting surface of the protective shell mechanism (1) and the electrical equipment cavity, and between the protective box (102) and the external component connection surface.

3. The fiber bundle perforated sealing and protective structure for electrical equipment cavities according to claim 1, characterized in that, The small flange (3) is nested outside the fiber bundle (2) and fixedly connected to the metal flange (101) to compress and fix the fiber bundle (2) to ensure airtightness.

4. The fiber bundle perforated sealing and protective structure for electrical equipment cavities according to claim 1, characterized in that, The metal flange (101) is a ZY-LOC high-pressure self-tightening flange made of TP347H stainless steel, and the bolt (106) is made of 35CrMoVA.

5. A fiber bundle perforated sealing and protective structure suitable for electrical equipment cavities according to claim 1, characterized in that, The protective box (102) has a lens viewing angle recess (104) at its end. The lens viewing angle recess (104) is an inner cone structure. Its cone angle is adapted to the imaging angle of the fiber bundle (2) to ensure that the imaging field of view is unobstructed. The outer surface of the protective box (102) is provided with an electromagnetic shielding layer, which constitutes a metal shielding structure (105).

6. The fiber bundle perforated sealing and protective structure for electrical equipment cavities according to claim 1, characterized in that, The tri-light mirror (4) includes a mirror body (403) made of barium fluoride glass. The blind hole (401) is axially opened in the mirror body (403). Both ends of the mirror body (403) are equipped with threaded sleeves (402). The threaded sleeves (402) are threadedly connected to the inner wall of the mounting channel of the protective box (102) for fixing the tri-light mirror (4) in the protective box (102).

7. A fiber bundle perforated sealing and protective structure suitable for electrical equipment cavities according to claim 1, characterized in that, It also includes a standard camera C interface and an adjustable connector (7). The standard camera C interface is an external adapter interface independent of the three-light mirror (4). It is installed on the optical path output end of the three-light mirror (4) away from the blind hole (401) to form an external connection structure for optical path transmission. The adjustable connector (7) is coaxially assembled between the standard camera C interface and the three-light mirror (4) and forms an axially adjustable fit with the standard camera C interface to precisely adjust the coupling distance between the end face of the fiber bundle (2) and the external camera target surface.

8. A fiber bundle perforated sealing and protective structure suitable for electrical equipment cavities according to claim 2, characterized in that, The structural colloid (5) is an epoxy resin adhesive, which is injected into the perforation gap of the fiber bundle (2) using a multi-layer injection process to sequentially complete the bottom layer gap filling, middle layer sealing reinforcement and surface layer protective encapsulation.

9. A fiber bundle perforated sealing and protective structure suitable for electrical equipment cavities according to claim 1, characterized in that, It also includes a small cover plate (8), which covers the side of the metal flange (101) facing the electrical equipment cavity. The contact surface between the small cover plate (8) and the metal flange (101) is sealed by structural colloid (5) to form an isolation and protection between the inside and outside of the air chamber.

10. A fiber bundle perforated sealing and protective structure suitable for electrical equipment cavities according to claim 2, characterized in that, The fiber bundle (2) is covered with a metal tube except for the area that is in contact with the sealing ring (6) and the structural colloid (5).

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