Fiber optic connector for temperature measurement in airtight equipment

Abstract

This utility model discloses a fiber optic connector for temperature measurement in airtight equipment, aiming to solve the problems of poor fiber optic protection and difficulty in ensuring sealing performance under conditions of large temperature changes in existing solutions. The fiber optic connector of this utility model includes a connector body, a fixing part, and a fiber optic ferrule. A fixing chamber is formed within the connector body, and the fixing part is disposed within the fixing chamber and fitted onto the fiber optic ferrule. The connector body includes a connecting part and a locking part, with the connecting part connected to the locking part. One end of the fixing part is connected to the connecting part, and the other end of the fixing part is connected to the locking part. The optical fiber passes sequentially through the connecting part, the fiber optic ferrule, and the locking part. The optical fiber passing through the fiber optic ferrule is a bare optical fiber, and the inner diameter of the fiber optic ferrule matches the outer diameter of the bare optical fiber. The inner diameter of the fiber optic through-hole in the fiber optic ferrule matches the outer diameter of the bare optical fiber, blocking the gas leakage path and meeting the requirements of an airtight environment for a long time, thus preventing equipment downtime due to seal failure.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic temperature measurement technology, and in particular to a fiber optic connector for temperature measurement in airtight equipment. Background Technology

[0002] To ensure internal insulation, many large-scale power equipment hydrogen-cooled generators use hydrogen as a cooling medium. During operation, temperature monitoring of critical components such as the stator windings and core is crucial for equipment safety: overheating of the stator bars can lead to insulation aging, while excessively high localized temperatures in the core can cause thermal stress deformation, potentially even causing unit shutdown. In this context, fiber optic temperature sensors, with their resistance to electromagnetic interference, inherent explosion-proof properties, and corrosion resistance, have become an ideal choice for internal temperature measurement in hydrogen-cooled generators.

[0003] Fiber optic temperature measurement technology, as a wired temperature monitoring method, requires the fiber optic sensor to penetrate from the temperature measurement point inside the high-pressure hydrogen cavity to the external monitoring equipment. However, existing penetration technologies struggle to simultaneously meet requirements such as small size, reliable hydrogen sealing, and optical signal transmission. While traditional solutions utilize metal-glass sintered sealing structures to achieve airtight penetration, they are relatively bulky. This solution provides a method that enables the fiber optic sensor to penetrate from the generator's high-pressure hydrogen cavity to the external monitoring equipment while maintaining the necessary gas pressure sealing within the cavity.

[0004] Current solutions typically employ a single sealed unit containing a single optical fiber, with multiple sealed units combined into a single sealed assembly to achieve internal and external sealing. There are also solutions that use a single mechanical structural component to fix multiple optical fibers through the connection.

[0005] Chinese patent publication number CN214255962U discloses "an optical fiber connector for sealing and connecting the inside and outside of a sealed cavity". The solution uses a single connector to fix multiple optical fibers. The structure has poor protection effect on the optical fibers at both ends. It uses metal parts to directly seal the optical fibers. The thermal expansion coefficients of metal and optical fibers are quite different, making it difficult to guarantee the sealing performance in scenarios with large temperature changes. Utility Model Content

[0006] (I) Purpose of the utility model

[0007] The purpose of this invention is to provide an airtight fiber optic connector for temperature measurement, which aims to solve the problems of poor fiber optic protection and difficulty in ensuring sealing performance in scenarios with large temperature changes in existing solutions.

[0008] (II) Technical Solution

[0009] To solve the above problems, this utility model provides a fiber optic connector for temperature measurement in airtight equipment, including a connector body, a fixing part and a fiber optic ferrule. A fixing chamber is formed inside the connector body, the fixing part is disposed in the fixing chamber, and the fixing part is sleeved and fixed on the fiber optic ferrule.

[0010] The connector body includes a connecting part and a locking part. The connecting part is connected to the locking part. One end of the fixing part is connected to the connecting part, and the other end of the fixing part is connected to the locking part. The optical fiber passes through the connecting part, the optical fiber ferrule, and the locking part in sequence. The optical fiber passing through the optical fiber ferrule is a bare optical fiber. The inner diameter of the optical fiber ferrule is adapted to the outer diameter of the bare optical fiber.

[0011] Preferably, the connecting part has a first through hole, a second through hole and a third through hole. The first through hole communicates with the third through hole through the second through hole. The fixing part is located in the third through hole. One end of the locking part is connected to the inner wall of the third through hole. The axis of the second through hole is collinear with the axis of the optical fiber ferrule. The optical fiber passing through the second through hole is a bare optical fiber.

[0012] Preferably, the locking part has a fourth through hole, a fifth through hole and a sixth through hole. The fourth through hole communicates with the sixth through hole through the fifth through hole. The third through hole and the fourth through hole form the fixing chamber. The axis of the fifth through hole is collinear with the axis of the optical fiber ferrule. The optical fiber passing through the fifth through hole is a bare optical fiber.

[0013] Preferably, the fixing part has a seventh through hole, an eighth through hole and a ninth through hole. The seventh through hole communicates with the ninth through hole through the eighth through hole. The inner diameter of the seventh through hole and the ninth through hole is larger than the inner diameter of the eighth through hole. The inner diameter of the eighth through hole is adapted to the outer diameter of the optical fiber ferrule.

[0014] Preferably, the fixing part forms a first glue reservoir and a second glue reservoir. The inner diameter of the first glue reservoir is larger than the inner diameter of the seventh through hole, and the inner diameter of the second glue reservoir is larger than the inner diameter of the ninth through hole. The seventh through hole communicates with the eighth through hole through the first glue reservoir, and the eighth through hole communicates with the ninth through hole through the second glue reservoir. The optical fiber is injected with glue during the installation of the optical fiber connector.

[0015] Preferably, the fiber optic connector further includes two limiting plates, with limiting holes formed on the two limiting plates. The optical fiber passes through the limiting holes, and the outer diameter of the optical fiber is adapted to the diameter of the limiting holes. One of the limiting plates is fixedly connected to the inner peripheral sidewall of the first through hole, and the other limiting plate is fixedly connected to the inner peripheral sidewall of the sixth through hole.

[0016] Preferably, the inner peripheral sidewall of the third through hole is formed with a first protrusion, and the optical fiber connector further includes a first buffer portion, one side of the first buffer portion abutting against the first protrusion, and the other side of the first buffer portion abutting against one end of the locking portion.

[0017] Preferably, a protrusion is formed on the outer side of the locking part, and the optical fiber connector further includes a second buffer part, which is sleeved on the locking part. One end of the connecting part abuts against one side of the second buffer part, and the other side of the second buffer part abuts against the protrusion.

[0018] Preferably, a second protrusion is formed on the inner side of the locking part, and the optical fiber connector further includes a third buffer part, one side of the third buffer part abutting against the second protrusion, and the other side of the third buffer part abutting against one end of the fixing part.

[0019] Preferably, the fiber optic connector further includes a limiting pin, which passes through the sidewall of the third through hole and is connected to the locking part.

[0020] (III) Beneficial Effects

[0021] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0022] 1. The inner diameter of the fiber optic ferrule's fiber optic through-hole is compatible with the outer diameter of the bare fiber. Furthermore, the fiber optic ferrule can be made of a material with a thermal expansion coefficient similar to or the same as that of the fiber optic material. Even if the temperature fluctuates during equipment operation, the two will not create gaps due to thermal expansion and contraction, thus blocking the gas leakage path. This can meet the requirements of harsh gas-tight environments such as high-pressure hydrogen and sulfur hexafluoride for a long time, preventing equipment shutdown due to seal failure.

[0023] 2. The bare optical fiber is transmitted in the channel within the fiber ferrule and the connector body, without interference from the outer sheath, resulting in extremely low optical signal loss. The fixing part secures the ferrule and the permanent fit after glue injection effectively prevents the optical fiber from bending or shifting due to vibration or temperature changes, ensuring a stable optical signal transmission path and making temperature monitoring data accurate and reliable, providing an accurate basis for evaluating the equipment's operating status.

[0024] 3. The fiber optic connector body, fixing part, and fiber optic ferrule integrate airtight sealing and optical transmission functions into one component. It ensures airtightness through a triple sealing mechanism, including the selection of ceramic material for the fiber optic ferrule, mechanical locking of the locking and connecting parts, and glue injection treatment during assembly. Its sealing principle does not rely on a single material or structure, thus it has a stronger adaptability to changes in environmental temperature, pressure, and chemical media and a longer service life. At the same time, the volume of the entire fiber optic connector is much smaller than that of traditional metal-glass sintered sealing structures, which can flexibly adapt to the narrow installation space of power equipment, such as hydrogen-cooled generators and GIS equipment. Attached Figure Description

[0025] Figure 1 This is an exploded view of an optical fiber connector provided by this utility model;

[0026] Figure 2 This is a schematic diagram of the overall structure of an optical fiber connector provided by this utility model;

[0027] Figure 3 This is a front structural schematic diagram of an optical fiber connector provided by this utility model;

[0028] Figure 4 yes Figure 3 Schematic diagram of the cross section of AA;

[0029] Figure 5 This is a cross-sectional schematic diagram of an optical fiber connector without optical fiber provided according to this utility model;

[0030] Figure 6 yes Figure 5 A schematic enlarged view of part B in the middle;

[0031] Figure 7 This is a cross-sectional schematic diagram of the fixing part and the fiber optic ferrule of an optical fiber connector provided by this utility model.

[0032] Figure label:

[0033] 1. The main body of the penetrator;

[0034] 11. Connecting part; 11a. First through hole; 11b. Second through hole; 11c. Third through hole; 111. First boss;

[0035] 12. Locking part; 12a. Fourth through hole; 12b. Fifth through hole; 12c. Sixth through hole; 121. Protrusion; 122. Second boss;

[0036] 2. Fixing part; 2a. Seventh through hole; 2b. Eighth through hole; 2c. Ninth through hole; 2d. First glue reservoir; 2e. Second glue reservoir;

[0037] 3. Fiber optic ferrule;

[0038] 4. Optical fiber;

[0039] 5. Limiting plate; 5a. Limiting hole;

[0040] 6. First buffer section; 7. Second buffer section; 8. Third buffer section; 9. Limit pin. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0042] The accompanying drawings show schematic diagrams of layer structures according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0043] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0044] In the description of this utility model, it should be noted that the terms "first" to "ninth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Combination Figures 1 to 7 This utility model provides a fiber optic connector for temperature measurement in airtight equipment, including a connector body 1, a fixing part 2, and a fiber optic ferrule 3. A fixing chamber is formed inside the connector body 1, and the fixing part 2 is disposed inside the fixing chamber and is sleeved and fixed on the fiber optic ferrule 3. The connector body 1 includes a connecting part 11 and a locking part 12. The connecting part 11 is connected to the locking part 12. One end of the fixing part 2 is connected to the connecting part 11, and the other end of the fixing part 2 is connected to the locking part 12. The fiber optic 4 passes through the connecting part 11, the fiber optic ferrule 3, and the locking part 12 in sequence. The fiber optic 4 passing through the fiber optic ferrule 3 is a bare fiber, and the inner diameter of the fiber optic ferrule 3 is adapted to the outer diameter of the bare fiber.

[0046] Specifically, the connector body 1 serves as the overall structural carrier, forming a fixed chamber that provides installation space for the fixing part 2 and the fiber optic ferrule 3. Simultaneously, the combination of the connecting part 11 and the locking part 12 constructs an overall assembly and a closed channel for fiber optic transmission 4. The fixing part 2 is nested within the fixed chamber to secure the fiber optic ferrule 3, ensuring stable ferrule positioning. A bare fiber optic cable passes through the fiber optic ferrule 3, its inner diameter precisely matching the outer diameter of the bare fiber, ensuring complete contact between the bare fiber and the fiber optic ferrule 3 when installed. The connecting part 11 and the locking part 12, when connected, form the main frame of the connector, providing channels for the entry and exit ends of the fiber optic 4, together forming the fixed chamber.

[0047] In a preferred embodiment, during the assembly of the fiber optic connector and its passage through the fiber optic cable 4, each component is glued after connection, corresponding to the channel through which the fiber optic cable 4 passes and the connection points between the components. The material of the fiber optic ferrule 3 is not limited here, as long as the thermal expansion coefficients of the fiber optic ferrule 3 and the fiber optic cable 4 are close. For example, when the fiber optic cable 4 is made of quartz glass, the fiber optic ferrule 3 can be made of ceramic or glass, which can effectively encapsulate the fiber optic cable 4 and have a close or similar thermal expansion coefficient, ensuring reliable sealing under varying temperature conditions.

[0048] With this configuration, the inner diameter of the fiber optic ferrule 3 through the hole of the fiber optic 4 is adapted to the outer diameter of the bare fiber. Furthermore, the fiber optic ferrule 3 can be made of ceramic or glass, with a thermal expansion coefficient similar to or the same as that of the quartz glass material of the fiber optic 4. Even if the temperature fluctuates during equipment operation, the two will not create gaps due to thermal expansion and contraction, thus preventing gas leakage. This ensures long-term compliance with the requirements of harsh gas-tight environments such as high-pressure hydrogen and sulfur hexafluoride, preventing equipment shutdown due to seal failure. The bare fiber transmits within the channel between the fiber optic ferrule 3 and the connector body 1, without external sheath interference, resulting in extremely low optical signal loss. The permanent fit of the fixing part 2 after the ferrule is fitted and glued effectively prevents the fiber optic 4 from bending or shifting due to vibration or temperature changes, ensuring a stable optical signal transmission path and accurate and reliable temperature monitoring data, providing an accurate basis for evaluating equipment operating status. The fiber optic connector body 1, fixing part 2, and fiber optic ferrule 3 integrate airtight sealing and optical transmission functions into one component. Airtightness is ensured through a triple sealing mechanism, including the selection of ceramic material for the fiber optic ferrule 3, mechanical locking of the locking part 12 and the connecting part 11, and glue injection during assembly. Its sealing principle does not rely on a single material or structure, thus it has a stronger adaptability to changes in environmental temperature, pressure, and chemical media, and a longer service life. At the same time, the volume of the entire fiber optic connector is much smaller than that of traditional metal-glass sintered sealing structures, which can flexibly adapt to the narrow installation space of power equipment, such as hydrogen-cooled generators and GIS equipment.

[0049] In a preferred embodiment, the connecting part 11 has a first through hole 11a, a second through hole 11b, and a third through hole 11c. The first through hole 11a communicates with the third through hole 11c through the second through hole 11b. The fixing part 2 is located inside the third through hole 11c. One end of the locking part 12 is connected to the inner wall of the third through hole 11c. The axis of the second through hole 11b is collinear with the axis of the optical fiber ferrule 3. The optical fiber 4 passing through the second through hole 11b is a bare optical fiber.

[0050] Specifically, the first through-hole 11a of the connecting part 11 provides an entry channel for the optical cable with an outer sheath, protecting the outer layer of the optical cable from wear at the edge of the connector. The second through-hole 11b connects the first through-hole 11a and the third through-hole 11c, and a bare optical fiber passes through it, providing initial positioning and linear guidance for the bare optical fiber. The diameter of the second through-hole 11b can be slightly larger than the diameter of the bare optical fiber, for example, 1.1 times the diameter of the bare optical fiber. After the optical fiber 4 passes through the second through-hole 11b, it is treated with adhesive to facilitate the installation of the optical fiber 4 and ensure stability and sealing effect after installation. The third through-hole 11c, as part of the fixing chamber, accommodates the fixing part 2, and its inner wall is connected to the locking part 12, serving as the assembly interface between the connecting part 11 and the locking part 12. The connector 11 guides the optical fiber 4 through a three-section through hole. After the optical cable enters through the first through hole 11a, the outer sheath is stripped off to become a bare optical fiber. It is then precisely guided through the second through hole 11b, which is collinear with the axis of the optical fiber ferrule 3, and inserted into the optical fiber ferrule 3 located in the third through hole 11c. At the same time, the third through hole 11c is connected to the locking part 12 to form a complete fixed cavity, providing a stable installation environment for the fixing part 2 and the ferrule.

[0051] With this design, the interconnected design of the first through-hole 11a, the second through-hole 11b, and the third through-hole 11c, combined with the collinearity of the axis of the second through-hole 11b and the ferrule axis, ensures that the path of the bare optical fiber from the point of stripping from the optical cable to the entrance of the optical fiber ferrule 3 is a straight line. This avoids friction and compression between the optical fiber 4 and the edge of the through-hole, protecting the bare optical fiber from mechanical damage and reducing optical signal loss due to bending. The third through-hole 11c, as part of the fixed chamber, provides a closed and stable accommodating space for the fixing part 2; and through its connection with the locking part 12, the fixed chamber is completely sealed, preventing the fixing part 2 and the optical fiber ferrule 3 from shifting position due to external environmental factors such as vibration and air pressure changes, ensuring the long-term reliability of the sealing structure. The dimensions of the three through-holes can be flexibly adjusted according to actual needs. For example, the first through-hole 11a can be adapted to optical cable sheaths of different outer diameters, and the second through-hole 11b can be adapted to bare optical fibers of different diameters, enabling the connector to be compatible with multiple specifications of optical fiber 4 or optical cable, improving product versatility.

[0052] In a preferred embodiment, the locking part 12 is formed with a fourth through hole 12a, a fifth through hole 12b and a sixth through hole 12c. The fourth through hole 12a communicates with the sixth through hole 12c through the fifth through hole 12b. The third through hole 11c and the fourth through hole 12a form a fixed cavity. The axis of the fifth through hole 12b is collinear with the axis of the optical fiber ferrule 3. The optical fiber 4 passing through the fifth through hole 12b is a bare optical fiber.

[0053] Specifically, the fourth through hole 12a and the third through hole 11c of the locking part 12 form a fixed cavity. The bare optical fiber passes through the fifth through hole 12b, which serves as a positioning channel for the bare optical fiber within the locking part 12. The diameter of the fifth through hole 12b can be slightly larger than the diameter of the bare optical fiber, for example, 1.1 times the diameter of the bare optical fiber. After the optical fiber 4 passes through the fifth through hole 12b, it is treated with adhesive to facilitate the installation of the optical fiber 4 and ensure stability and sealing effect after installation. The sixth through hole 12c provides a passage for the optical cable with an outer sheath, protecting the outer layer of the optical cable from damage. The locking part 12 engages with the three-section through-hole of the connecting part 11 through a three-section through-hole. The bare optical fiber enters the optical fiber ferrule 3 through the second through-hole 11b and exits through the fifth through-hole 12b. It is then re-wrapped in the outer sheath at the sixth through-hole 12c to become an optical cable. The fifth through-hole 12b and the third through-hole 11c are collinear, meaning that the bare optical fiber passing through the third through-hole 11c, the optical fiber ferrule 3, and the fifth through-hole 12b is on the same straight line, ensuring the straightness of the bare optical fiber transmission. At the same time, the fourth through-hole 12a and the third through-hole 11c enclose a complete fixed cavity, ensuring the integrity of the internal sealing structure.

[0054] With this configuration, the locking part 12's three-section through-hole cooperates with the connecting part 11's three-section through-hole. The interconnected design of the fourth through-hole 12a, fifth through-hole 12b, and sixth through-hole 12c, combined with the collinearity of the fifth through-hole 12b's axis and the ferrule axis, ensures that the path of the bare optical fiber from the point of stripping from the optical cable to the entrance of the optical fiber ferrule 3 is a straight line. This avoids friction and compression between the optical fiber 4 and the edge of the through-hole, protecting the bare optical fiber from mechanical damage and reducing optical signal loss due to bending, thus improving overall transmission stability. The fourth through-hole 12a and the third through-hole 11c enclose a sealed fixed chamber. The fixing part 2 and the optical fiber ferrule 3 are completely enclosed within this sealed space. Sealing operations such as glue injection and the mating of the optical fiber ferrule 3 with the optical fiber 4 are all completed within this sealed chamber and at both ends via the second through-hole 11b and the fifth through-hole 12b. Under high-pressure environments, this can more effectively prevent gas leakage or intrusion. The sixth through hole 12c and the first through hole 11a serve as the outlet and inlet of the optical cable, respectively. The direction of fiber 4's entry and exit is not restricted here; as long as fiber 4 can pass through and the usage requirements are met, it is acceptable. The structure is symmetrical, and the hole diameters are all adapted to the outer sheath of the optical cable, providing consistent protection for the cable. This prevents the cable from being squeezed or worn at the inlet or outlet due to improper hole diameters, extending the cable's lifespan and reducing maintenance needs.

[0055] In a preferred embodiment, the fixing part 2 is formed with a seventh through hole 2a, an eighth through hole 2b and a ninth through hole 2c. The seventh through hole 2a is connected to the ninth through hole 2c through the eighth through hole 2b. The inner diameters of the seventh through hole 2a and the ninth through hole 2c are larger than the inner diameter of the eighth through hole 2b. The inner diameter of the eighth through hole 2b is adapted to the outer diameter of the optical fiber ferrule 3.

[0056] Specifically, the inner diameters of the seventh through hole 2a and the ninth through hole 2c of the fixing part 2 are larger than those of the eighth through hole 2b, providing installation guidance space for the fiber optic ferrule 3 and the fiber optic cable 4, and also providing operational space for subsequent glue application. The inner diameter of the eighth through hole 2b precisely matches the outer diameter of the fiber optic ferrule 3, fitting and fixing the fiber optic ferrule 3 to ensure stable positioning of the ferrule within the fixing part 2. The fixing part 2 uses a three-section through hole to fix the fiber optic ferrule 3. The large diameters of the seventh through hole 2a and the ninth through hole 2c guide the fiber optic ferrule 3 and the fiber optic cable 4 smoothly into place, preventing them from bumping against the edge of the fixing part 2; the eighth through hole 2b matches the outer diameter of the ferrule, tightly fitting and fixing the ferrule.

[0057] This design, with its large-diameter guiding structure in the seventh and ninth through holes 2a and 2c, allows the fiber optic ferrule 3 to slide quickly and accurately into the eighth through hole 2b without requiring high-precision alignment, reducing assembly difficulty and improving efficiency. Simultaneously, the large diameter prevents hard collisions between the fiber optic ferrule 3 and the edge of the through hole in the fixing part 2, protecting the fiber optic ferrule 3 from damage, especially for ceramic ferrules which are easily damaged during installation, ensuring the integrity of the fiber optic ferrule 3 during assembly. The tight fit between the eighth through hole 2b and the outer diameter of the fiber optic ferrule 3 eliminates any radial movement space within the fixing part 2. After adhesive injection, the adhesive fills the gaps between the seventh and ninth through holes 2c and the ferrule; after curing, it not only fixes the axial position of the ferrule but also forms a continuous sealing layer, firmly bonding the ferrule to the fixing part 2. Even under vibration, the ferrule will not shift, ensuring airtightness and optical transmission performance.

[0058] It should be noted that the relationship between the length of the fiber optic ferrule 3 and the length of the eighth through-hole 2b is not limited here; they can be the same length, with both ends of the fiber optic ferrule 3 located on either side of the eighth through-hole 2b. (Combined with...) Figure 7 In a preferred embodiment, the length of the fiber optic ferrule 3 is greater than the length of the eighth through hole 2b. The two ends of the fiber optic ferrule 3 are located in the seventh through hole 2a and the ninth through hole 2c, respectively. After the fiber optic ferrule 3 is installed, glue is injected to fill the gap between the seventh through hole 2a, the ninth through hole 2c and the ferrule, forming a dual function of fixing and sealing.

[0059] In a preferred embodiment, the fixing part 2 is formed with a first glue storage tank 2d and a second glue storage tank 2e. The inner diameter of the first glue storage tank 2d is larger than the inner diameter of the seventh through hole 2a, and the inner diameter of the second glue storage tank 2e is larger than the inner diameter of the ninth through hole 2c. The seventh through hole 2a is connected to the eighth through hole 2b through the first glue storage tank 2d, and the eighth through hole 2b is connected to the ninth through hole 2c through the second glue storage tank 2e. The optical fiber 4 is injected with glue during the installation of the optical fiber connector.

[0060] Specifically, the inner diameters of the first glue reservoir 2d and the second glue reservoir 2e are larger than the inner diameters of the seventh through hole 2a and the ninth through hole 2c, providing glue storage space for glue injection and increasing the contact area between the glue and the fixing part 2 and the fiber optic ferrule 3. The fixing part 2 improves the glue injection effect by providing the first glue reservoir 2d and the second glue reservoir 2e on both sides of the eighth through hole 2b. The seventh through hole 2a is connected to the eighth through hole 2b through the first glue reservoir 2d, and the eighth through hole 2b is connected to the ninth through hole 2c through the second glue reservoir 2e. During glue injection, the glue first accumulates in large quantities in the glue reservoir and then penetrates into the mating gap between the ferrule and the eighth through hole 2b, forming a continuous sealing layer with a large contact area. Simultaneously, the glue injection process fills all component gaps, forming a continuous sealing layer and further enhancing the sealing effect.

[0061] With this configuration, the first adhesive reservoir 2d and the second adhesive reservoir 2e provide larger adhesive holding space. During adhesive injection, the adhesive can accumulate fully in the reservoir and then penetrate into the mating gap between the ferrule and the fixing part 2, ensuring the penetration and sealing effect of the adhesive during the injection process. Even if there are tiny gaps, the adhesive can fully fill them, especially in high-pressure and airtight environments, which can more effectively block leakage channels and ensure long-term sealing reliability. After the adhesive cures in the reservoir, it forms an embedded connection with the fixing part 2 and the ferrule, increasing the contact area and improving the fixing strength. The axial and radial movement of the fiber optic ferrule 3 is effectively restricted by the cured adhesive. Even under external tension or vibration, the ferrule can remain stable, avoiding sealing failure or abnormal optical signal transmission due to displacement.

[0062] In a preferred embodiment, the fiber optic connector further includes two limiting plates 5, with limiting holes 5a formed on the two limiting plates 5. The fiber optic cable 4 passes through the limiting holes 5a, and the outer diameter of the fiber optic cable 4 is adapted to the diameter of the limiting holes 5a. One of the limiting plates 5 is fixedly connected to the inner peripheral sidewall of the first through hole 11a, and the other limiting plate 5 is fixedly connected to the inner peripheral sidewall of the sixth through hole 12c.

[0063] Specifically, the two limiting plates 5 are fixed to the inner peripheral sidewalls of the first through hole 11a and the sixth through hole 12c, respectively. The specific positions of the two limiting plates 5 are not limited here. Figure 4 and Figure 5As shown, in the preferred embodiment, the two limiting plates 5 are located on the inner sides of the two ends of the first through hole 11a and the sixth through hole 12c near the inlet or entrance, respectively. That is, one limiting plate 5 is located near the left side of the first through hole 11a, and the other limiting plate 5 is located near the right side of the sixth through hole 12c. Limiting holes 5a are formed on the limiting plates 5. The optical fiber 4 passes through the limiting holes 5a, and the hole diameter matches the outer diameter of the optical fiber 4. The number of limiting holes 5a is set according to the number of optical fibers 4. When the optical fibers 4 are in a bundle, one corresponding limiting hole 5a is provided on the limiting plate 5. When the optical fibers 4 are in multiple bundles, the limiting plate 5 is provided with a corresponding number of limiting holes 5a, serving as a limiting and initial sealing function. The limiting holes 5a position the optical fiber 4, ensuring the coaxiality of the optical fiber 4, the optical fiber ferrule 3, and each through hole. Two limiting plates 5 are fixed at the inlet and outlet of the connector, respectively. After the optical fiber 4 passes through the limiting hole 5a, the optical fiber 4 is precisely positioned because the diameter of the limiting hole 5a matches the outer diameter of the optical fiber 4, ensuring that its axis is consistent with the axis of each through hole and the optical fiber ferrule 3. In this way, when the optical fiber 4 is inserted into the ferrule and each through hole, it will not be displaced due to shaking, thus ensuring sealing and transmission performance.

[0064] With this configuration, the limiting hole 5a is adapted to the outer diameter of the optical fiber 4, fixing the position of the optical fiber 4 at the inlet and outlet. This ensures that the transmission path of the optical fiber 4 within the entire fiber optic connector is completely coaxial with the ferrule and the axes of each through-hole. This coaxiality prevents friction and compression between the optical fiber 4 and the ferrule and through-hole edges, reducing damage to the optical fiber 4 and optical signal loss. Simultaneously, after the optical fiber 4 passes through the limiting hole 5a, the limiting plate 5 forms a preliminary sealing structure at both ends of the first through-hole 11a and the sixth through-hole 12c, improving sealing reliability and preventing other impurities from entering from both ends during operation, thus contaminating or damaging the fiber optic connector and improving the overall structural stability. The limiting plate 5 provides radial constraint to the optical fiber 4, preventing it from shaking or shifting due to vibration during equipment operation. The stability of the optical fiber 4 further ensures the positional stability of the fixing part 2 and the optical fiber ferrule 3, allowing the fiber optic connector to maintain stable performance even under vibration environments such as generators.

[0065] In a preferred embodiment, the inner peripheral sidewall of the third through hole 11c is formed with a first protrusion 111, and the fiber optic connector also includes a first buffer portion 6, one side of the first buffer portion 6 abuts against the first protrusion 111, and the other side of the first buffer portion 6 abuts against one end of the locking portion 12.

[0066] Specifically, the first boss 111 is located on the inner circumferential sidewall of the third through hole 11c, providing support for the first buffer part 6. The first buffer part 6 is located between the first boss 111 and the locking part 12, serving to buffer, dampen shocks, and prevent deformation under pressure after installation, thereby improving the sealing effect. The first boss 111 in the third through hole 11c abuts against one side of the first buffer part 6, and the other side of the first buffer part 6 abuts against one end of the locking part 12. When the connector is subjected to axial vibration or stress, the first buffer part 6 absorbs and buffers the stress, such as with an elastic rubber ring, to prevent the locking part 12 from directly colliding with the connecting part 11, thus protecting internal components such as the fixing part 2 and the fiber optic ferrule 3.

[0067] It should be noted that the specific connection method between the connecting part 11 and the locking part 12 is not limited here; it can be a snap-fit, screw-fit, or butt joint followed by welding. In a preferred embodiment, the connecting part 11 and the locking part 12 are screwed together. After the screwing is completed, the first buffer part 6 is under pressure, which creates a preload between the threads of the connecting part 11 and the locking part 12, ensuring the connection effect during use. At the same time, the first buffer part 6 can also seal the gap between the connecting part 11 and the locking part 12, further improving the overall sealing effect.

[0068] With this design, the first buffer part 6 can effectively absorb axial vibration energy. After the vibration generated by the equipment operation is weakened by the buffer part, the direct collision between the locking part 12 and the connecting part 11 is avoided, which can prevent problems such as loosening of the fixing part 2 and breakage of the optical fiber ferrule 3, and improve the product's vibration resistance life. The first buffer part 6 can compensate for axial clearance errors during assembly, making the connection between the locking part 12 and the connecting part 11 tighter. Even if there are slight deviations in the axial dimensions of each component during processing, the elasticity and compressibility of the first buffer part 6 can keep the structure compact after assembly, improve overall stability, and thus ensure sealing and transmission performance.

[0069] In a preferred embodiment, a protrusion 121 is formed on the outer side of the locking part 12, and the fiber optic connector also includes a second buffer part 7, which is sleeved on the locking part 12. One end of the connecting part 11 abuts against one side of the second buffer part 7, and the other side of the second buffer part 7 abuts against the protrusion 121.

[0070] Specifically, the protrusion 121 is located outside the locking part 12, providing limiting support for the second buffer part 7. The second buffer part 7 is sleeved on the locking part 12, located between the connecting part 11 and the protrusion 121, protecting the connection structure of the penetrator body 1. The structure of the protrusion 121 and the working principle and effect of the second buffer part 7 are similar to those of the first protrusion 111 and the first buffer part 6 mentioned above, and will not be described in detail here.

[0071] In a preferred embodiment, a second protrusion 122 is formed on the inner side of the locking part 12, and the fiber optic connector also includes a third buffer part 8, one side of the third buffer part 8 abuts against the second protrusion 122, and the other side of the third buffer part 8 abuts against one end of the fixing part 2.

[0072] Specifically, the second protrusion 122 is located inside the locking part 12, providing limiting support for the third buffer part 8. When the locking part 12 adopts a three-section through-hole structure, the second protrusion 122 is formed at the position where the fourth through hole 12a and the fifth through hole 12b connect. That is, the diameter of the fifth through hole 12b needs to be reduced to be smaller than the diameter of the fourth through hole 12a, and the second protrusion 122 is formed at this reduced position. The third buffer part 8 is disposed between the second protrusion 122 and the fixing part 2, protecting the fixing part 2 and the fiber optic ferrule 3. The second protrusion 122 inside the locking part 12 abuts against one side of the third buffer part 8, and the other side abuts against one end of the fixing part 2. When the connector is subjected to axial force or vibration, it is transmitted to the third buffer part 8, preventing the fixing part 2 from directly colliding with the locking part 12, and protecting the fixing part 2 and the fiber optic ferrule 3.

[0073] With this design, the third buffer section 8 can buffer the axial force between the fixing section 2 and the locking section 12, protecting the fixing section 2 and the fiber optic ferrule 3, and improving product reliability and service life. By buffering the axial force, the third buffer section 8 keeps the fit between the fixing section 2 and the ferrule stable, ensuring tight contact between the fiber optic ferrule 3 and the fiber optic cable 4, and the integrity of the adhesive sealing layer between the fixing section 2 and the fiber optic ferrule 3, maintaining airtight performance over the long term and improving overall stability.

[0074] In a preferred embodiment, the fiber optic connector further includes a limiting pin 9, which passes through the sidewall of the third through hole 11c and is connected to the locking part 12.

[0075] Specifically, the limiting pin 9 passes through the side wall of the third through hole 11c and connects to the locking part 12, serving as a circumferential limiting element to prevent relative rotation between the locking part 12 and the connecting part 11. Corresponding insertion holes are provided at the mating positions of the locking part 12 and the connecting part 11. After the locking part 12 and the connecting part 11 are mated, the insertion hole positions on the two components correspond. At this time, the limiting pin 9 is installed into the insertion hole to limit the relative position of the locking part 12 and the connecting part 11, restricting relative rotation between the locking part 12 and the connecting part 11 in the circumferential direction. Even under circumferential torque or vibration, the connection between the two will not loosen, ensuring the structural stability of the penetrator body 1.

[0076] It should be noted that the specific number and installation method of the limit pins 9 are not limited here. (Combined with...) Figure 4In a preferred embodiment, two limiting pins 9 are provided, located on the upper and lower sides of the connecting part 11 and the locking part 12, respectively. Threaded holes are machined at corresponding positions on the connecting part 11 and the locking part 12. The limiting pins 9 are screw-like and engage with the threaded holes to achieve circumferential limiting of the connecting part 11 and the locking part 12. The threaded holes on the connecting part 11 are through holes, while the threaded holes on the locking part 12 can be either through holes or non-through holes. The threaded holes can be machined before the connecting part 11 and the locking part 12 are connected, or they can be machined after the connection is completed.

[0077] With this design, the limiting pin 9 effectively prevents relative rotation between the locking part 12 and the connecting part 11, which is especially suitable for easily loosened connection methods such as threaded connections. Circumferential vibration and torque during equipment operation can easily cause threads to loosen, thereby damaging the sealing chamber structure of the connector. The circumferential limiting of the limiting pin 9 ensures the long-term stability of the connector body 1 connection and maintains the integrity of the internal seal and the overall structure. The pin hole of the limiting pin 9 is usually drilled only after the locking part 12 is tightened to the optimal position, ensuring the accuracy and consistency of the assembly.

[0078] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A gas-tight temperature sensing fiber optic penetrator, comprising: The fiber optic connector includes a connector body (1), a fixing part (2) and a fiber optic ferrule (3). A fixing chamber is formed inside the connector body (1). The fixing part (2) is disposed in the fixing chamber and is sleeved and fixed on the fiber optic ferrule (3). The connector body (1) includes a connecting part (11) and a locking part (12). The connecting part (11) is connected to the locking part (12). One end of the fixing part (2) is connected to the connecting part (11), and the other end of the fixing part (2) is connected to the locking part (12). The optical fiber (4) passes through the connecting part (11), the optical fiber ferrule (3), and the locking part (12) in sequence. The optical fiber (4) passing through the optical fiber ferrule (3) is a bare optical fiber. The inner diameter of the optical fiber ferrule (3) is adapted to the outer diameter of the bare optical fiber.

2. The fiber optic conduit of claim 1, wherein, The connecting part (11) has a first through hole (11a), a second through hole (11b) and a third through hole (11c). The first through hole (11a) communicates with the third through hole (11c) through the second through hole (11b). The fixing part (2) is located inside the third through hole (11c). One end of the locking part (12) is connected to the inner wall of the third through hole (11c). The axis of the second through hole (11b) is collinear with the axis of the optical fiber ferrule (3). The optical fiber (4) passing through the second through hole (11b) is a bare optical fiber.

3. The fiber optic conduit of claim 2, wherein, The locking part (12) has a fourth through hole (12a), a fifth through hole (12b) and a sixth through hole (12c). The fourth through hole (12a) communicates with the sixth through hole (12c) through the fifth through hole (12b). The third through hole (11c) and the fourth through hole (12a) form the fixed chamber. The axis of the fifth through hole (12b) is collinear with the axis of the optical fiber ferrule (3). The optical fiber (4) passing through the fifth through hole (12b) is a bare optical fiber.

4. The fiber optic conduit of claim 3, wherein, The fixing part (2) has a seventh through hole (2a), an eighth through hole (2b) and a ninth through hole (2c). The seventh through hole (2a) communicates with the ninth through hole (2c) through the eighth through hole (2b). The inner diameter of the seventh through hole (2a) and the ninth through hole (2c) is larger than the inner diameter of the eighth through hole (2b). The inner diameter of the eighth through hole (2b) is adapted to the outer diameter of the optical fiber ferrule (3).

5. The fiber optic conduit according to claim 4, wherein, The fixing part (2) has a first glue reservoir (2d) and a second glue reservoir (2e). The inner diameter of the first glue reservoir (2d) is larger than the inner diameter of the seventh through hole (2a), and the inner diameter of the second glue reservoir (2e) is larger than the inner diameter of the ninth through hole (2c). The seventh through hole (2a) is connected to the eighth through hole (2b) through the first glue reservoir (2d), and the eighth through hole (2b) is connected to the ninth through hole (2c) through the second glue reservoir (2e). The optical fiber (4) is injected with glue during the installation of the optical fiber connector.

6. The fiber optic conduit according to claim 5, wherein, The fiber optic connector also includes two limiting plates (5), with limiting holes (5a) formed on the two limiting plates (5). The fiber optic cable (4) passes through the limiting holes (5a), and the outer diameter of the fiber optic cable (4) is adapted to the diameter of the limiting holes (5a). One of the limiting plates (5) is fixedly connected to the inner peripheral sidewall of the first through hole (11a), and the other limiting plate (5) is fixedly connected to the inner peripheral sidewall of the sixth through hole (12c).

7. The fiber optic conduit of claim 2, wherein, The inner peripheral sidewall of the third through hole (11c) is formed with a first boss (111), and the optical fiber connector also includes a first buffer part (6). One side of the first buffer part (6) abuts against the first boss (111), and the other side of the first buffer part (6) abuts against one end of the locking part (12).

8. The fiber optic conduit of claim 1, wherein, The locking part (12) has a protrusion (121) on its outer side. The fiber optic connector also includes a second buffer part (7), which is sleeved on the locking part (12). One end of the connecting part (11) abuts against one side of the second buffer part (7), and the other side of the second buffer part (7) abuts against the protrusion (121).

9. The fiber optic conduit of claim 1, wherein, The locking part (12) has a second protrusion (122) formed on its inner side. The optical fiber connector also includes a third buffer part (8). One side of the third buffer part (8) abuts against the second protrusion (122), and the other side of the third buffer part (8) abuts against one end of the fixing part (2).

10. The fiber optic conduit of claim 2, wherein, The fiber optic connector also includes a limiting pin (9), which passes through the side wall of the third through hole (11c) and is connected to the locking part (12).

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