An all-fiber current transformer sensor fixing structure

Abstract

This application relates to the field of sensor technology, specifically to a sensor fixing structure for an all-fiber optic current transformer. The structure includes an annular protective box with an internal mounting groove. The protective box comprises an annular upper cover and a lower cover, which are axially connected. The mounting groove is located between the upper and lower covers and penetrates the inner circumferential surface of the protective box radially. An annular baffle, made of plastic, is provided inside the mounting groove. Both sides of the baffle abut against the inner wall of the mounting groove along the axial direction. The inner circumferential surface of the baffle is flush with the inner circumferential surface of the protective box. An annular internal space is formed between the outer circumferential surface of the baffle and the inner wall of the mounting groove. An elastic seal is provided within this internal space. The outer surface of the elastic seal covers the upper surface, lower surface, and side of the internal space away from the baffle. The inner surface of the elastic seal and the outer circumferential surface of the baffle form an annular space for mounting the sensor. This application can stably fix the sensor.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically to a fixed structure for an all-fiber current transformer sensor. Background Technology

[0002] All-fiber current sensors, also known as fiber optic current measuring devices, all-fiber current transformers, or passive electronic current transformers, are based on the magneto-optical Faraday effect and Ampere's circuital law. When a conductor is energized, the propagation modes of two light waves change relative to each other under the influence of the magnetic field around the conductor, resulting in a phase difference. This ultimately manifests as a change in the superimposed light intensity at the detector. By measuring the magnitude of the light intensity, the corresponding current magnitude can be determined.

[0003] The protective enclosure of a full-fiber optic current transformer sensor is a crucial component that protects the sensor from external influences, ensuring its stable operation. The protective enclosure provides physical protection, environmental protection, and electromagnetic shielding. Specifically, it prevents the sensor from physical damage such as mechanical shocks, collisions, and vibrations, avoiding damage to internal optical components and optical fibers caused by external forces, which could affect measurement accuracy or even cause sensor failure. It also provides dustproof, waterproof, and moisture-proof protection, preventing dust and moisture from entering the enclosure and causing contamination, corrosion, or short circuits to the sensor's optical components and circuitry. Furthermore, since the sensor of a full-fiber optic current transformer is a low-voltage system, it is susceptible to external electromagnetic interference. The sensor enclosure is typically made of materials with electromagnetic shielding properties, effectively blocking external electromagnetic fields from interfering with the internal signal transmission and processing of the sensor, ensuring the accuracy of measurement results.

[0004] In related technologies, sensor protection boxes are usually ring-shaped with interlocking top and bottom structures. The sensor is installed in a fixing groove inside the protection box. The protection box is usually made of aluminum alloy. However, in the existing technology, there is a large gap between the sensor and the fixing groove, resulting in poor fixing effect. During transportation and operation, the sensor may be displaced or deformed due to vibration, causing the protection box to fail to effectively protect the sensor. Utility Model Content

[0005] To address the technical problem that sensors in existing sensor protection boxes are prone to displacement or deformation during the transportation and operation of all-fiber current transformer sensors, this invention provides a sensor fixing structure for all-fiber current transformers.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A fixed structure for a full-fiber current transformer sensor includes an annular protective box with an internal mounting groove. The protective box includes an annular upper cover and a lower cover, which are joined axially. The mounting groove is located between the upper and lower covers and penetrates the inner circumferential surface of the protective box radially. An annular baffle made of plastic is provided inside the mounting groove. Both sides of the baffle abut against the inner wall of the mounting groove along the axial direction. The inner circumferential surface of the baffle is flush with the inner circumferential surface of the protective box. An annular internal space is formed between the outer circumferential surface of the baffle and the inner wall of the mounting groove. An elastic seal is provided in the internal space. The outer surface of the elastic seal covers the upper surface, lower surface, and side of the internal space away from the baffle. An annular space for mounting the sensor is formed between the inner surface of the elastic seal and the outer circumferential surface of the baffle.

[0008] This invention provides both elastic protection and sealing for the sensor by incorporating an elastic seal, buffering vibrations during transportation and operation, and reducing sensor displacement. Furthermore, the invention includes a plastic baffle, which, compared to aluminum alloy, offers greater flexibility and can absorb and cushion external forces on the protective housing, further reducing sensor displacement, deformation, and the probability of failure. Under the protection of the elastic seal, external moisture, dust, and other impurities will not enter the internal space through the joint between the baffle's axial sides and the inner wall of the mounting groove. The elastic seal and baffle provide comprehensive sealing protection for the sensor. Additionally, the plastic baffle can isolate external electromagnetic interference to some extent, preventing electromagnetic signals from penetrating the outer surface of the protective housing through the mounting groove and interfering with the sensor, thus ensuring the accuracy and stability of current signal transmission.

[0009] As a preferred implementation of a fixed structure for an all-fiber current transformer sensor, a positioning groove is provided on one side of the baffle along the axial direction, and a positioning protrusion adapted to the groove is provided on the inner wall of the mounting groove. The positioning groove on one side of the baffle along the axial direction and the matching positioning protrusion on the inner wall of the mounting groove make the installation of the baffle in the mounting groove more precise and stable, preventing radial displacement of the baffle within the mounting groove, further ensuring the stability of the sensor installed in the annular space, and improving the overall fixing effect of the structure on the sensor.

[0010] As a preferred implementation of the fixing structure for an all-fiber current transformer sensor, the positioning protrusion is located on either the upper or lower cover. Clearly defining whether the positioning protrusion is on the upper or lower cover makes its position clearer during manufacturing and assembly, facilitating production and installation. This ensures accurate matching between the positioning protrusion and the positioning groove, thereby better positioning the baffle and ensuring stable sensor installation.

[0011] As a preferred implementation of a fixed structure for an all-fiber current transformer sensor, the upper cover has several annular waterproof protrusions at the splicing surface with the lower cover, arranged radially. Correspondingly, the lower cover has several annular waterproof grooves at the splicing surface with the upper cover, with each groove corresponding to one of the protrusions. This structure, with its annular waterproof protrusions on the upper cover and corresponding waterproof grooves on the lower cover arranged radially, allows the waterproof protrusions and grooves to work together to form a continuous, bent seam. This effectively prevents moisture from entering the casing from the splicing surface, protecting the sensor from moisture corrosion, improving the sensor's operating environment quality, and extending its lifespan.

[0012] As a preferred implementation of the sensor fixing structure for an all-fiber current transformer, the outer circumference of the protective box is provided with a sealing groove. The position of the sealing groove corresponds to the splicing seam formed by the splicing of the upper and lower covers, and an outer sealing ring is installed inside the sealing groove. The sealing groove on the outer circumference of the protective box, with its position corresponding to the splicing seam and the installation of the outer sealing ring, further enhances the sealing performance of the protective box. In addition to preventing moisture from entering, it also prevents dust, foreign objects, etc. from entering the interior of the protective box, thus better protecting the sensor and enabling it to operate stably even in harsh environments.

[0013] As a preferred implementation of the sensor fixing structure for an all-fiber current transformer, the elastic seal is made of rubber. Rubber possesses excellent elasticity and flexibility, enabling it to better adapt to vibrations and impacts during transportation and operation, providing reliable buffering and elastic support. Simultaneously, the good sealing performance of rubber further enhances the sealing performance of the protective casing, thus providing better protection for the sensor.

[0014] As a preferred implementation of a sensor fixing structure for an all-fiber current transformer, a fixing groove is provided on the outer circumferential surface of the baffle, and a fixing block is installed within the fixing groove. The size of the fixing block is adapted to the fixing groove, and the fixing block is connected to the sensor. The fixing groove on the outer circumferential surface of the baffle, and the fixing block installed within the fixing groove, which is adapted to the size of the fixing groove, provides a tighter connection between the sensor and the baffle, further restricting the displacement of the sensor, enhancing the stability of the sensor installation, and improving the fixing effect of the fixing structure on the sensor.

[0015] As a preferred implementation of the sensor fixing structure for an all-fiber current transformer, a fixing groove is arranged around the outer circumference of the baffle. This arrangement ensures the sensor is more evenly fixed in the circumferential direction, preventing instability in any particular direction and further improving the stability and reliability of the sensor installation, while also better preventing displacement or deformation.

[0016] As a preferred implementation of a sensor fixing structure for an all-fiber current transformer, the surface of the upper cover away from the lower cover has several first threaded holes extending axially into the lower cover. These first threaded holes are evenly arranged circumferentially, and first screws are installed within them. The surface of the lower cover away from the upper cover has several second threaded holes extending axially into the upper cover. These second threaded holes are evenly arranged circumferentially, and second screws are installed within them. The first and second threaded holes are staggered circumferentially. The upper and lower covers, with their axially extending and circumferentially evenly arranged first and second threaded holes, are staggered. The installation of the first and second screws makes the connection between the upper and lower covers more secure and tighter, improving the overall structural strength of the protective box and thus better protecting the internal sensor. It also enhances the stability of the protective box during transportation and operation.

[0017] As a preferred implementation of the fixing structure for an all-fiber current transformer sensor, a first sealing block is installed in the first threaded hole, located between the head of the first screw and the surface of the upper cover away from the lower cover; a second sealing block is installed in the second threaded hole, located between the head of the second screw and the surface of the lower cover away from the upper cover. Installing the first and second sealing blocks in the first and second threaded holes respectively, located between the screw head and the surfaces of the upper and lower covers, further enhances the sealing performance at the threaded holes, preventing moisture, dust, etc., from entering the casing through the threaded holes, protecting the normal operation of the sensor, and improving the sensor's reliability and service life.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. The all-fiber optic current transformer sensor fixing structure of this utility model effectively solves the problem of sensor displacement or deformation during transportation and operation in existing technologies by setting up an annular protective box, special mounting grooves, baffles, and elastic seals, thus stably fixing the sensor. At the same time, by setting up a series of positioning, waterproof, and sealing structures, the sealing performance of the protective box is improved, protecting the sensor from external factors such as moisture and dust, improving the quality and reliability of the sensor's operating environment, extending the sensor's service life, and enhancing the overall structural strength and stability of the protective box, thus possessing good practicality and application value.

[0020] 2. This utility model provides both elastic protection and sealing for the sensor by incorporating an elastic sealing element. This buffers vibrations during transportation and operation, reducing sensor displacement. Furthermore, the utility model includes a plastic baffle, which, compared to aluminum alloy, offers greater flexibility and can absorb and buffer external forces on the protective housing, further reducing sensor displacement, deformation, and the probability of failure. Under the protection of the elastic sealing element, external moisture, dust, and other impurities will not enter the internal space through the joint between the baffle's axial sides and the inner wall of the mounting groove. The elastic sealing element and baffle provide comprehensive sealing protection for the sensor. Additionally, the plastic baffle can isolate external electromagnetic interference to a certain extent, preventing electromagnetic signals from entering the protective housing through the mounting groove and interfering with the sensor, thus ensuring the accuracy and stability of current signal transmission.

[0021] 3. The upper cover is equipped with several ring-shaped waterproof protrusions, and the lower cover is equipped with corresponding waterproof grooves, which are arranged radially. When the upper and lower covers are spliced, the waterproof protrusions and waterproof grooves cooperate to form a continuous bending splice seam, which can effectively prevent water from entering the protective box from the splicing surface of the upper and lower covers, protect the sensor from water corrosion, improve the quality of the sensor's operating environment, and extend the sensor's service life.

[0022] 4. A fixing groove is provided on the outer circumference of the baffle. A fixing block connected to the sensor is installed in the fixing groove. The fixing block and the fixing groove are matched in size, so that there is a tighter connection between the sensor and the baffle, which restricts the displacement of the sensor, enhances the stability of the sensor installation, and improves the fixing effect of the fixing structure on the sensor. Attached Figure Description

[0023] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional structural diagram of a fixed structure for an all-fiber current transformer sensor in a specific embodiment of this utility model.

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0026] Figure 3 for Figure 1 Enlarged schematic diagram of the structure at point B.

[0027] List of components and reference numerals:

[0028] 1. Protective box; 2. Top cover; 3. Bottom cover; 4. Baffle; 5. Elastic seal; 6. Sensor; 7. Positioning protrusion; 8. Waterproof protrusion; 9. Outer sealing ring; 10. Fixing block; 11. First screw; 12. Second screw; 13. First sealing block; 14. Second sealing block. Detailed Implementation

[0029] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] Reference Figures 1-3 This embodiment proposes a sensor fixing structure for an all-fiber optic current transformer, including an annular protective box 1. The protective box 1 has an internal mounting groove. The protective box 1 includes an annular upper cover 2 and a lower cover 3, which are joined axially. The mounting groove is located between the upper cover 2 and the lower cover 3. A sealing groove is provided on the outer circumference of the protective box 1, and its position corresponds to the joint seam formed by the joining of the upper cover 2 and the lower cover 3. An outer sealing ring 9 is installed inside the sealing groove. Installing the outer sealing ring 9 further enhances the sealing performance of the protective box 1, preventing moisture ingress and also preventing dust, foreign objects, etc., from entering the interior of the protective box 1, thus better protecting the sensor 6 and enabling it to operate stably even in harsh environments.

[0031] In this embodiment, the upper cover 2 has several annular waterproof protrusions 8 at the splicing surface with the lower cover 3. These protrusions 8 are arranged radially. Correspondingly, the lower cover 3 has several annular waterproof grooves at the splicing surface with the lower cover 3. The waterproof grooves correspond one-to-one with the waterproof protrusions 8. When the upper cover 2 and lower cover 3 are spliced, the waterproof protrusions 8 and the waterproof grooves cooperate to form a continuous bent splicing seam. This effectively prevents moisture from entering the interior of the protective box 1 from the splicing surface of the upper and lower covers 3, protecting the sensor 6 from moisture corrosion, improving the quality of the operating environment of the sensor 6, and extending the service life of the sensor 6.

[0032] To secure the upper cover 2 and the lower cover 3, in this embodiment, the surface of the upper cover 2 away from the lower cover 3 has several first threaded holes. These first threaded holes extend axially into the lower cover 3 and are evenly arranged circumferentially. A first screw 11 and a first sealing block 13 are installed in each of the first threaded holes, with the first sealing block 13 located between the head of the first screw 11 and the surface of the upper cover 2 away from the lower cover 3. The surface of the lower cover 3 away from the upper cover 2 has several second threaded holes. These second threaded holes extend axially into the upper cover 2 and are evenly arranged circumferentially. A second screw 12 and a second sealing block 14 are installed in each of the second threaded holes, with the second sealing block 14 located between the head of the second screw 12 and the surface of the lower cover 3 away from the upper cover 2. The first threaded holes and the second threaded holes are staggered in the circumferential direction. By installing the first screw 11 and the second screw 12, the connection between the upper cover 2 and the lower cover 3 is made more secure and tighter from both directions, improving the overall structural strength of the protective box 1. This better protects the internal sensor 6 and also enhances the stability of the protective box 1 during transportation and operation, preventing the upper cover 2 or the lower cover 3 from falling off due to unidirectional vibration. The first sealing block 13 and the second sealing block 14 further enhance the sealing at the threaded hole, preventing moisture, dust, etc., from entering the interior of the protective box 1 through the threaded hole, protecting the normal operation of the sensor 6, and improving the reliability and service life of the sensor 6.

[0033] In this embodiment, the mounting groove penetrates the inner circumferential surface of the protective box 1 in the radial direction. An annular baffle 4 is provided inside the mounting groove. The baffle 4 is made of plastic. Both sides of the baffle 4 in the axial direction abut against the inner wall of the mounting groove. The inner circumferential surface of the baffle 4 is flush with the inner circumferential surface of the protective box 1. An annular internal space is formed between the outer circumferential surface of the baffle 4 and the inner wall of the mounting groove. An elastic sealing element 5 is provided in the internal space. The elastic sealing element 5 is made of rubber. The outer surface of the elastic sealing element 5 covers the upper surface, the lower surface and the side of the internal space away from the baffle 4. An annular space for mounting the sensor 6 is formed between the inner surface of the elastic sealing element 5 and the outer circumferential surface of the baffle 4.

[0034] To facilitate the positioning of the baffle 4, in this embodiment, a positioning groove is provided on one side of the baffle 4 along the axial direction, and a positioning protrusion 7 that matches the groove is formed on the inner wall of the mounting groove. The positioning protrusion 7 is located on the lower cover 3. In other embodiments, the positioning protrusion 7 may also be located on the upper cover 2. This makes the installation of the baffle 4 in the mounting groove more precise and stable, prevents the baffle 4 from radially displacing in the mounting groove, further ensures the stability of the sensor 6 installed in the annular space, and improves the fixing effect of the entire fixing structure on the sensor 6.

[0035] To facilitate the fixing of sensor 6, in this embodiment, a fixing groove is provided on the outer circumference of baffle 4, and a fixing block 10 is provided in the fixing groove. The size of fixing block 10 is adapted to the fixing groove, and fixing block 10 is connected to sensor 6. This provides a tighter connection between sensor 6 and baffle 4, further restricting the displacement of sensor 6, enhancing the stability of sensor 6 installation, and improving the fixing effect of the fixing structure on sensor 6. Furthermore, the fixing groove surrounds the outer circumference of baffle 4, allowing sensor 6 to be fixed more evenly in the circumferential direction, avoiding situations where sensor 6 is not firmly fixed in a certain direction, further improving the stability and reliability of sensor 6 installation, and better preventing sensor 6 from shifting or deforming. In a specific embodiment, fixing block 10 and sensor 6 can be bonded together or connected by snap-fit.

[0036] In this embodiment, the direction facing the central hole of the annular structure is used as the standard to distinguish between the inside and the outside. The direction facing the central hole is the inside, and the direction away from the central hole is the outside. For example, the inner circumferential surface of the baffle 4 is the circumferential surface of the baffle 4 facing the central hole, and the outer circumferential surface of the baffle 4 is the circumferential surface of the baffle 4 away from the central hole.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fixing structure for a full-fiber current transformer sensor, comprising an annular protective box (1), wherein the protective box (1) has an internal mounting groove, the protective box (1) comprising an annular upper cover (2) and a lower cover (3), the upper cover (2) and the lower cover (3) being spliced ​​together along the axial direction, and the mounting groove being located between the upper cover (2) and the lower cover (3), characterized in that, The mounting groove penetrates the inner circumferential surface of the protective box (1) in the radial direction. An annular baffle (4) is provided inside the mounting groove. The baffle (4) is made of plastic. Both sides of the baffle (4) in the axial direction abut against the inner wall of the mounting groove. The inner circumferential surface of the baffle (4) is flush with the inner circumferential surface of the protective box (1). An annular internal space is formed between the outer circumferential surface of the baffle (4) and the inner wall of the mounting groove. An elastic seal (5) is provided in the internal space. The outer surface of the elastic seal (5) covers the upper surface of the internal space, the lower surface of the internal space, and the side of the internal space away from the baffle (4). An annular space for installing the sensor (6) is formed between the inner surface of the elastic seal (5) and the outer circumferential surface of the baffle (4).

2. The all-fiber optic current transformer sensor fixing structure according to claim 1, characterized in that, The baffle (4) has a positioning groove on one side along the axial direction, and the inner wall of the mounting groove has a positioning protrusion (7) that matches the groove.

3. The all-fiber optic current transformer sensor fixing structure according to claim 2, characterized in that, The positioning protrusion (7) is located on the upper cover (2) or the lower cover (3).

4. The all-fiber optic current transformer sensor fixing structure according to claim 1, characterized in that, The upper cover (2) has several ring-shaped waterproof protrusions (8) at the splicing surface with the lower cover (3). The ring-shaped waterproof protrusions (8) are arranged in the radial direction. Correspondingly, the lower cover (3) has several ring-shaped waterproof grooves at the splicing surface with the lower cover (3). The waterproof grooves correspond one-to-one with the waterproof protrusions (8).

5. The all-fiber optic current transformer sensor fixing structure according to claim 1, characterized in that, The outer periphery of the protective box (1) is provided with a sealing groove, the position of which corresponds to the splicing seam formed by the splicing of the upper cover (2) and the lower cover (3), and an outer sealing ring (9) is installed in the sealing groove.

6. The all-fiber optic current transformer sensor fixing structure according to claim 1, characterized in that, The elastic seal (5) is made of rubber.

7. The all-fiber optic current transformer sensor fixing structure according to claim 1, characterized in that, A fixing groove is provided on the outer circumferential surface of the baffle (4), and a fixing block (10) is provided in the fixing groove. The size of the fixing block (10) is adapted to the fixing groove, and the fixing block (10) is connected to the sensor (6).

8. The all-fiber optic current transformer sensor fixing structure according to claim 7, characterized in that, The fixed groove is wrapped around the outer periphery of the baffle (4).

9. The all-fiber optic current transformer sensor fixing structure according to claim 1, characterized in that, The upper cover (2) has several first threaded holes on its surface away from the lower cover (3). The first threaded holes extend into the lower cover (3) along the axial direction. The several first threaded holes are evenly arranged along the circumferential direction. A first screw (11) is installed in the first threaded hole. The lower cover (3) has several second threaded holes on its surface away from the upper cover (2). The second threaded holes extend into the upper cover (2) along the axial direction. The several second threaded holes are evenly arranged along the circumferential direction. A second screw (12) is installed in the second threaded hole. The first and second threaded holes are staggered in the circumferential direction.

10. The all-fiber optic current transformer sensor fixing structure according to claim 9, characterized in that, A first sealing block (13) is installed in the first threaded hole. The first sealing block (13) is located between the head of the first screw (11) and the surface of the upper cover (2) away from the lower cover (3). A second sealing block (14) is installed in the second threaded hole. The second sealing block (14) is located between the head of the second screw (12) and the surface of the lower cover (3) away from the upper cover (2).

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