Packaging structure of fiber-optic voltage sensor head

Abstract

The utility model discloses a packaging structure of optical fiber voltage sensing head relates to optical fiber voltage sensing head technical field, including closed insulating shell, the lateral wall of closed insulating shell is equipped with the fiber hole, the through -hole no. One and the through -hole no. Two, BGO crystal, faraday collimation rotatory polarimeter and optical fiber, BGO crystal and faraday collimation rotatory polarimeter all are arranged in the closed insulating shell inner chamber and opposite adhesion, and one end of optical fiber is passed through the fiber hole and is connected with faraday collimation rotatory polarimeter one end, electrode assembly no. One and electrode assembly no. Two, one end of electrode assembly no. One and electrode assembly no. Two correspond to each other and press in the both sides of BGO crystal to fasten, and the other end of electrode assembly no. One and electrode assembly no. Two correspond to each other and pass through the through -hole no. One and the through -hole no. Two, intermediate filling layer, fills in the closed insulating shell inner chamber and fiber hole. The utility model can promote the long -term stability and signal transmission reliability of optical voltage sensor under high -voltage environment, ensure its sensing head under high -voltage, strong electromagnetic interference and the stable work under the harsh environment.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic voltage sensing head technology, and in particular to the packaging structure of fiber optic voltage sensing heads. Background Technology

[0002] In traditional high-voltage power systems, electromagnetic voltage transformers (EVTs) and capacitive voltage transformers (CVTs) are typically used as the core equipment for voltage measurement. However, they have inherent drawbacks such as susceptibility to electromagnetic interference, core saturation, complex insulation structures, flammability and explosiveness, narrow bandwidth, and small dynamic range, making them unsuitable for the needs of smart grids, high-precision voltage measurement, and new power systems. Therefore, fiber optic voltage transformers (FOVTs) can effectively avoid the shortcomings of traditional transformers and are more suitable for the rapid development needs of power systems.

[0003] Existing fiber optic voltage sensor head encapsulation mostly uses a single epoxy resin potting, which is prone to cracking when the temperature changes and has poor partial discharge performance, resulting in a loss of accuracy of the fiber optic voltage transformer.

[0004] Therefore, how to provide a packaging structure for fiber optic voltage sensing heads that can improve the long-term stability and signal transmission reliability of optical voltage sensors under high-voltage environments, and ensure the stable operation of the sensing heads under high voltage, strong electromagnetic interference and harsh environments, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the packaging structure of the fiber optic voltage sensor head provided by this utility model aims to solve the problems of poor insulation performance, mechanical stability and temperature adaptability of traditional fiber optic voltage sensor head packaging structures.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a packaging structure for an optical fiber voltage sensing head, including:

[0008] A closed insulating shell, wherein a fiber optic hole is provided on a side wall 1 of the closed insulating shell, a through hole 1 is provided on a side wall 2 adjacent to the side wall 1 of the closed insulating shell, and a through hole 2 is provided on a side wall 3 opposite to the side wall 2 of the closed insulating shell.

[0009] The BGO crystal, Faraday collimator, and optical fiber are disposed within the inner cavity of the enclosed insulating shell and are arranged in relative contact with each other along the axial direction of the fiber optic hole. The Faraday collimator is located between the BGO crystal and the fiber optic hole. One end of the optical fiber passes through the fiber optic hole and is connected to the end of the Faraday collimator away from the BGO crystal.

[0010] Electrode assembly one and electrode assembly two, one end of which corresponds to and abuts against the two ends of the BGO crystal corresponding to the two sides of the sidewall two and the two sides of the sidewall three, to fasten the BGO crystal; the other ends of electrode assembly one and electrode assembly two pass through the through hole one and the through hole two and extend to the outside of the closed insulating shell.

[0011] An intermediate filling layer fills the inner cavity of the closed insulating shell and the fiber penetration hole, and covers the outer walls of the BGO crystal, the Faraday collimator, the optical fiber, the first electrode assembly, and the second electrode assembly.

[0012] The fiber optic voltage sensor head of this invention employs a multi-layer packaging architecture. The sealed insulating shell effectively resists the erosion of environmental factors such as ultraviolet rays, wind, sand, and moisture, thereby reducing interference from the external environment on the internal optical components. The intermediate filling layer effectively buffers the stress caused by temperature changes, preventing displacement or damage to the optical components due to thermal expansion and contraction. The BGO crystal is clamped and fixed by electrode assembly one and electrode assembly two, and constrained by the intermediate filling layer, providing a stable clamping force and effectively preventing crystal displacement. This invention improves the long-term stability and signal transmission reliability of the optical voltage sensor under high-voltage environments, ensuring stable operation of its sensor head under high voltage, strong electromagnetic interference, and harsh environments.

[0013] As a further improvement to the above technical solution, the enclosed insulating shell includes a box body and a top cover that can be adapted to seal at the top opening of the box body;

[0014] A fiber optic hole is provided in the middle of the first side wall of the box body, a through hole is provided in the middle of the second side wall of the box body adjacent to the first side wall, and a through hole is provided in the middle of the third side wall of the box body opposite to the second side wall.

[0015] The inner bottom surface of the housing is a positioning reference surface; the bottom surface of the BGO crystal abuts against the positioning reference surface, and the inner wall surface of the top cover presses against the top surface of the BGO crystal; the inner bottom surface of the housing has a positioning block on one side near the side wall, and the top surface of the positioning block has a positioning groove corresponding to the fiber optic hole and communicating with the fiber optic hole; the Faraday collimator is adapted to be installed in the positioning groove.

[0016] The beneficial effects of the above technical solution are as follows: the BGO crystal achieves precise positioning through the positioning reference plane, and is stabilized longitudinally by the top cover and laterally by the electrode assembly one and electrode assembly two, thus achieving precise positioning of the BGO crystal; the Faraday collimator achieves precise positioning through the positioning groove, and is constrained by the intermediate filling layer, ensuring that the optical element does not shift under vibration; thereby ensuring a stable connection between the Faraday collimator and the BGO crystal, and realizing the reference transfer between the Faraday collimator and the BGO crystal.

[0017] As a further improvement to the above technical solution, a sealing adhesive is also included, which is disposed at the outer opening of the fiber optic hole to fix the housing to the optical fiber.

[0018] The beneficial effects of the above technical solution are: fixing the optical fiber with sealing adhesive at the probe fiber outlet can improve tensile strength and ensure long-term stability.

[0019] As a further improvement to the above technical solution, a coupling adhesive is also included, which is disposed at the connection between the Faraday collimator and the optical fiber, so that the BGO crystal and the Faraday collimator are optically coupled to the optical fiber through the coupling adhesive.

[0020] The beneficial effects of the above technical solution are: by using high-refractive-index optical coupling adhesive to connect the optical fiber with the Faraday collimator and BGO crystal, low-loss transmission of optical signals can be ensured.

[0021] As a further improvement to the above technical solution, the top of the box body is provided with an annular insert groove around its top opening; the top cover is adapted to be inserted into the annular insert groove, and the inner wall of the top cover is formed with a positioning protrusion that can be adapted to press against the top surface of the BGO crystal.

[0022] The beneficial effects of the above technical solution are: by fitting the top cover into the annular mounting groove, the influence of external environmental factors such as ultraviolet rays and sandstorms on the sensing element can be further reduced; the positioning boss further improves the positioning accuracy of the BGO crystal.

[0023] As a further improvement to the above technical solution, the electrode assembly one includes an electrode clamping plate one, an electrode rod one, and an elastic element one; the electrode clamping plate one is located between the BGO crystal and the side wall two; one end of the electrode rod one passes through the through hole one and is vertically fixed on the plate surface of the electrode clamping plate one; one end of the elastic element one abuts against the side wall two, and the other end abuts against the electrode clamping plate one, thereby the electrode clamping plate one presses against the BGO crystal;

[0024] The second electrode assembly includes a second electrode clamp, a second electrode rod, and a second elastic element; the second electrode clamp is located between the BGO crystal and the third sidewall; one end of the second electrode rod passes through the second through hole and is vertically fixed to the surface of the second electrode clamp; one end of the second elastic element abuts against the third sidewall and the other end abuts against the second electrode clamp, thereby the second electrode clamp presses against the BGO crystal; the surfaces of the first electrode clamp and the second electrode clamp are parallel and together clamp and position the BGO crystal.

[0025] The beneficial effects of the above technical solution are: electrode rod one and electrode clamp one, and electrode rod two and electrode clamp two, all constitute an umbrella-shaped high-voltage electrode structure. Combined with the pre-tightening force of elastic element one and elastic element two, the uniform distribution of electric field is achieved, and a stable clamping force is provided, which further effectively prevents crystal displacement.

[0026] As a further improvement to the above technical solution, both electrode clamp one and electrode clamp two are gold-plated copper plates; both electrode rod one and electrode rod two are gold-plated copper rods.

[0027] The beneficial effect of the above technical solution is that by using gold-plated copper as the high-voltage electrode material, the effective transmission of voltage signals is achieved.

[0028] As a further improvement to the above technical solution, the enclosed insulating shell is a ceramic shell.

[0029] The beneficial effects of the above technical solution are: the use of ceramic shell for the sealed insulating shell can significantly improve insulation, high temperature resistance and anti-aging properties.

[0030] As a further improvement to the above technical solution, the intermediate filling layer is a UV-curable adhesive layer.

[0031] The beneficial effects of the above technical solution are: the intermediate filling layer is made of UV-curable adhesive, which has excellent insulation, anti-aging and UV curing properties.

[0032] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a packaging structure for an optical fiber voltage sensing head, which has the following advantages and beneficial effects:

[0033] 1. This utility model, through the cooperation of various materials and the combination of their respective characteristics, takes a structural approach and, while ensuring the electrical insulation of the sensor head, greatly improves the mechanical stability, signal transmission reliability, and environmental adaptability of the sensor head.

[0034] 2. This utility model adopts a multi-layer packaging structure, including an outer ceramic shell, a middle UV-curable adhesive buffer layer, and an inner optical fixing layer, which can effectively resist the erosion of environmental factors such as ultraviolet rays, wind, sand, and moisture, enhance the overall sealing performance, and effectively reduce the interference of the external environment on the internal optical components.

[0035] 3. This utility model effectively compensates for assembly tolerances by combining the pre-tightening force of the elastic element with the filling adhesive of the intermediate layer, ensuring that each optical element maintains stable contact over a long period of time.

[0036] 4. The present invention adopts an umbrella-shaped electrode structure to reduce the local electric field intensity and effectively suppress corona discharge; the ceramic shell and the UV-curable adhesive filling layer form a double insulation barrier, which significantly reduces dielectric loss. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 A top view of the internal structure of the packaging structure of the fiber optic voltage sensing head of this utility model.

[0039] Figure 2 A cross-sectional view of the packaging structure of the fiber optic voltage sensor head of this utility model along the fiber axis and parallel to the second sidewall.

[0040] Figure 3 A cross-sectional view of the packaging structure of the fiber optic voltage sensor head of this utility model along the vertical fiber axis.

[0041] Figure 4 A top view of the packaging structure of the fiber optic voltage sensing head of this utility model;

[0042] In the diagram: 1. Enclosed insulating shell; 11. Box body; 111. Side wall one; 1111. Fiber optic hole; 112. Side wall two; 1121. Through hole one; 113. Side wall three; 1131. Through hole two; 114. Positioning reference surface; 115. Positioning block; 1151. Positioning groove; 116. Annular mounting groove; 12. Top cover; 121. Positioning boss; 2. BGO crystal; 3. Faraday collimator; 4. Optical fiber; 5. Electrode assembly one; 51. Electrode clamp one; 52. Electrode rod one; 53. Elastic element one; 6. Electrode assembly two; 61. Electrode clamp two; 62. Electrode rod two; 63. Elastic element two; 7. Intermediate filler layer; 8. Sealing adhesive; 9. Coupling adhesive. Detailed Implementation

[0043] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0044] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] According to the embodiments of this utility model, such as Figures 1 to 4 As shown, the packaging structure of the fiber optic voltage sensor head includes: a closed insulating shell 1, a BGO crystal 2, a Faraday collimator rotator 3, an optical fiber 4, an electrode assembly 1 5, an electrode assembly 2 6, and an intermediate filling layer 7.

[0048] The side wall 111 of the sealed insulating shell 1 is provided with a fiber through hole 1111, the side wall 112 adjacent to the side wall 111 of the sealed insulating shell 1 is provided with a through hole 1121, and the side wall 113 opposite to the side wall 112 of the sealed insulating shell 1 is provided with a through hole 1131.

[0049] Both the BGO crystal 2 and the Faraday collimator 3 are disposed in the inner cavity of the sealed insulating shell 1 and are arranged in relative fit along the axial direction of the fiber optic hole 1111. The Faraday collimator 3 is located between the BGO crystal 2 and the fiber optic hole 1111. One end of the optical fiber 4 passes through the fiber optic hole 1111 and is connected to the end of the Faraday collimator 3 away from the BGO crystal 2.

[0050] One end of electrode assembly 5 and one end of electrode assembly 6 are attached to and pressed against the two ends of the corresponding sidewalls 112 and 113 of BGO crystal 2 to secure BGO crystal 2; the other ends of electrode assembly 5 and electrode assembly 6 pass through through hole 1121 and through hole 1131 and extend to the outside of the closed insulating shell 1.

[0051] The intermediate filling layer 7 fills the inner cavity of the closed insulating shell 1 and the fiber penetration hole 1111, and covers the outer walls of the BGO crystal 2, Faraday collimator 3, optical fiber 4, electrode assembly 1 5 and electrode assembly 2 6.

[0052] The fiber optic voltage sensor head of this embodiment adopts a multi-layer packaging architecture. The sealed insulating shell 1 can effectively resist the corrosion of environmental factors such as ultraviolet rays, wind, sand, and moisture, thereby reducing the interference of the external environment on the internal optical components. The intermediate filling layer 7 can effectively buffer the stress caused by temperature changes, preventing the optical components from shifting or being damaged due to thermal expansion and contraction. The BGO crystal 2 is clamped and fixed by electrode assembly 5 and electrode assembly 6, and constrained by the intermediate filling layer 7, providing a stable clamping force and effectively preventing crystal displacement. This utility model can improve the long-term stability and signal transmission reliability of the optical voltage sensor under high voltage environment, ensuring the stable operation of its sensor head under high voltage, strong electromagnetic interference and harsh environment.

[0053] Specifically, both electrode assembly 5 and electrode assembly 6 are high-voltage electrode assemblies.

[0054] In some embodiments, the enclosed insulating shell 1 includes a housing 11 and a top cover 12 that can be adapted to be sealed at the top opening of the housing 11.

[0055] A fiber optic hole 1111 is provided in the middle of the side wall 111 of the box body 11, a through hole 1121 is provided in the middle of the side wall 2 112 of the box body 11 adjacent to the side wall 111, and a through hole 2 1131 is provided in the middle of the side wall 3 113 of the box body 11 opposite to the side wall 2 112.

[0056] The inner bottom surface of the housing 11 is a positioning reference surface 114; the bottom surface of the BGO crystal 2 abuts against the positioning reference surface 114, and the inner wall surface of the top cover 12 presses against the top surface of the BGO crystal 2; the inner bottom surface of the housing 11 has a positioning block 115 on the side wall 111, and the top surface of the positioning block 115 has a positioning groove 1151 that communicates with the fiber optic hole 1111 at the corresponding fiber optic hole 1111; the Faraday collimator 3 is adapted to be installed in the positioning groove 1151.

[0057] The BGO crystal 2 is precisely positioned via the positioning reference plane 114, ensuring that the optical axis alignment accuracy (optical path collimation) between the Faraday collimator and the BGO crystal is ≤0.1°. It is further stabilized by longitudinal pressure from the top cover 12 and by lateral pressure from electrode assembly 5 and electrode assembly 6, thus achieving precise positioning of the BGO crystal 2. The Faraday collimator 3 is precisely positioned via the positioning groove 1151 and is tightly constrained by the intermediate filling layer 7, achieving a dual fixing method of filling constraint and mechanical clamping. This ensures that the optical element does not shift under vibration environments of 5-2000Hz, thereby ensuring a stable connection between the Faraday collimator 3 and the BGO crystal 2 and achieving reference transfer between them.

[0058] In some embodiments, a sealing adhesive 8 is also included, which is disposed at the outer opening of the fiber optic hole 1111 to fix the housing 11 to the optical fiber 4.

[0059] Specifically, the top coat adhesive 8 uses 16B adhesive, which is also a specialized UV-curing adhesive used in the industry.

[0060] Fiber 4 is fixed at the probe fiber outlet using 16B adhesive, which has excellent tensile strength (>50N) and long-term stability.

[0061] In some embodiments, a coupling adhesive 9 is also included, which is disposed at the connection between the Faraday collimator 3 and the optical fiber 4, so that the BGO crystal 2, the Faraday collimator 3 and the optical fiber 4 are optically coupled through the coupling adhesive 9.

[0062] The coupling adhesive 9 serves as the connection material between the optical fiber and the crystal. The high-refractive-index optical coupling adhesive connects the optical fiber 4 with the Faraday collimator rotator 3 and the BGO crystal 2, which can ensure low-loss transmission of optical signals.

[0063] In some embodiments, the top of the box body 11 is provided with an annular mounting groove 116 around its top opening; the top cover 12 is adapted to be mounted in the annular mounting groove 116, and the inner wall of the top cover 12 is provided with a positioning boss 121 that can be adapted to press against the top surface of the BGO crystal 2 at the location corresponding to the BGO crystal 2.

[0064] After the top of the housing 11 is opened with an annular mounting groove 116, an L-shaped stepped mounting structure is formed to match the top cover 12. This design enhances the overall sealing performance. The top cover 12 is fitted into the annular mounting groove 116, which can further effectively reduce the impact of external environmental factors such as ultraviolet rays and sandstorms on the sensing element. The positioning boss 121 further improves the positioning accuracy of the BGO crystal 2.

[0065] In some embodiments, the electrode assembly 5 includes an electrode clamp 51, an electrode rod 52, and an elastic member 53; the electrode clamp 51 is located between the BGO crystal 2 and the sidewall 112; one end of the electrode rod 52 passes through the through hole 1121 and is vertically fixed on the surface of the electrode clamp 51; one end of the elastic member 53 abuts against the sidewall 112 and the other end abuts against the electrode clamp 51, thereby pressing the electrode clamp 51 against the BGO crystal 2;

[0066] Electrode assembly 2 6 includes electrode clamping plate 2 61, electrode rod 2 62 and elastic element 2 63; electrode clamping plate 2 61 is located between BGO crystal 2 and side wall 3 113; one end of electrode rod 2 62 passes through through hole 2 1131 and is vertically fixed on the plate surface of electrode clamping plate 2 61; one end of elastic element 2 63 abuts against side wall 3 113 and the other end abuts against electrode clamping plate 2 61, thereby electrode clamping plate 2 61 presses against BGO crystal 2; electrode clamping plate 1 51 is parallel to the plate surface of electrode clamping plate 2 61 and together clamps and positions BGO crystal 2.

[0067] Electrode rod 52 and electrode clamp 51, and electrode rod 62 and electrode clamp 61, all form an umbrella-shaped high-voltage electrode structure. Combined with the pre-tightening force of elastic element 53 and elastic element 63, they achieve a uniform distribution of electric field and provide a stable clamping force, which further effectively prevents crystal displacement.

[0068] In some embodiments, electrode clamp 51 and electrode clamp 61 are both gold-plated copper plates; electrode rod 52 and electrode rod 62 are both gold-plated copper rods.

[0069] By using gold-plated copper as the high-voltage electrode material, the effective transmission of voltage signals was achieved.

[0070] Specifically, elastic element 1 53 is a pre-tension spring mounted on electrode rod 1 52; elastic element 2 63 is a pre-tension spring mounted on electrode rod 2 62; both elastic element 1 53 and elastic element 2 63 are made of corrosion-resistant alloy material.

[0071] It should be noted that the BGO crystal 2 achieves dual fixation in both the lateral and longitudinal directions. By combining the gold-plated copper high-voltage electrode (using an umbrella-shaped structure) with the pre-tightening spring, both a uniform distribution of the electric field and a stable clamping force are achieved, effectively preventing the crystal from shifting laterally. In addition, the precise cooperation between the positioning reference surface 114 of the housing 11 and the positioning boss 121 of the top cover 12 ensures that the axial positioning accuracy of the BGO crystal 2 is <0.02mm.

[0072] In some embodiments, the enclosed insulating shell 1 is a ceramic shell.

[0073] The enclosed insulating shell 1 is made of ceramic, which can significantly improve insulation, high temperature resistance and anti-aging properties.

[0074] Specifically, the outer encapsulation uses high-purity Al2O3 ceramic material, which has excellent insulation properties (dielectric strength >15kV / mm), high temperature resistance (>1600℃) and anti-aging properties.

[0075] In some embodiments, the intermediate filler layer 7 is a UV-curable adhesive layer.

[0076] The intermediate filler layer 7 is made of UV-curable adhesive, which has excellent insulation, anti-aging and UV curing properties.

[0077] Specifically, the inner cavity of the housing 11 is filled with UV-curable adhesive, specifically 1051 adhesive, chosen for its excellent insulation, good anti-aging properties, and UV curing characteristics. The housing 11 and top cover 12 are tightly fitted together, achieving an IP68 protection rating. The 1051 adhesive undergoes a UV pre-curing + heat curing (80℃ / 2h) process to ensure bubble-free filling and close contact between the 1051 adhesive and the BGO crystal 2, Faraday collimator 3, optical fiber 4, electrode assembly 5, and electrode assembly 6. The outer ceramic shell is encapsulated using a high-temperature sintering process (>1200℃) to achieve high density. An umbrella-shaped electrode structure reduces local electric field strength, effectively suppressing corona discharge. The Al2O3 ceramic shell and the 1051 adhesive filling layer form a double insulating barrier, reducing dielectric loss to <0.5%.

[0078] Specifically, the 1051 adhesive used in the intermediate filler layer 7 has a coefficient of thermal expansion that matches that of the optical components, effectively buffering the stress caused by temperature changes and preventing displacement or damage to the optical components due to thermal expansion and contraction, thereby improving the environmental adaptability of the sensor head.

[0079] Specifically, through precision assembly and coaxial calibration of optical components, the error can be controlled to <0.02mm; the end face of fiber 4 adopts an ultra-precision polishing process to make the angle between the end face and the axis <0.5°, so as to improve the measurement accuracy.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0081] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A packaging structure of a fiber optic voltage sensor head, characterized by, include: A closed insulating shell (1) is provided with a fiber optic hole (1111) on a side wall (111) of the closed insulating shell (1), and a through hole (1121) is provided on a side wall (112) of the closed insulating shell (1) adjacent to the side wall (111), and a through hole (1131) is provided on a side wall (113) of the closed insulating shell (1) opposite to the side wall (112). The BGO crystal (2), Faraday collimator (3), and optical fiber (4) are arranged in the inner cavity of the closed insulating shell (1) and are relatively close to each other along the axial direction of the fiber optic hole (1111). The Faraday collimator (3) is located between the BGO crystal (2) and the fiber optic hole (1111). One end of the optical fiber (4) passes through the fiber optic hole (1111) and is connected to the end of the Faraday collimator (3) away from the BGO crystal (2). Electrode assembly one (5) and electrode assembly two (6) are provided, with one end of electrode assembly one (5) and electrode assembly two (6) respectively attached to and pressed against the two ends of the BGO crystal (2) corresponding to the side wall two (112) and the side wall three (113) to fasten the BGO crystal (2); the other ends of electrode assembly one (5) and electrode assembly two (6) respectively pass through the through hole one (1121) and the through hole two (1131) and extend to the outside of the closed insulating shell (1); Intermediate filling layer (7) fills the inner cavity of the closed insulating shell (1) and the fiber optic hole (1111) and covers the outer walls of the BGO crystal (2), the Faraday collimator (3), the optical fiber (4), the first electrode assembly (5) and the second electrode assembly (6).

2. The packaging structure of the fiber optic voltage sensor head according to claim 1, wherein, The enclosed insulating shell (1) includes a box body (11) and a top cover (12) that can be adapted to seal at the top opening of the box body (11); The box body (11) has a fiber optic hole (1111) in the middle of the first side wall (111), a through hole (1121) in the middle of the second side wall (112) adjacent to the first side wall (111), and a through hole (1131) in the middle of the third side wall (113) opposite to the second side wall (112). The inner bottom surface of the box (11) is a positioning reference surface (114); the bottom surface of the BGO crystal (2) abuts against the positioning reference surface (114), and the inner wall surface of the top cover (12) presses against the top surface of the BGO crystal (2); the inner bottom surface of the box (11) near the side wall (111) has a positioning block (115), and the top surface of the positioning block (115) is provided with a positioning groove (1151) communicating with the fiber optic hole (1111) at the location corresponding to the fiber optic hole (1111); the Faraday collimator (3) is adapted to be installed in the positioning groove (1151).

3. The packaging structure of the fiber optic voltage sensor head according to claim 2, wherein, It also includes a sealing adhesive (8), which is disposed at the outer opening of the fiber optic hole (1111) to fix the housing (11) and the optical fiber (4).

4. The packaging structure of the fiber optic voltage sensing head according to claim 2, characterized in that, It also includes a coupling adhesive (9), which is disposed at the connection between the Faraday collimator (3) and the optical fiber (4) so ​​that the BGO crystal (2), the Faraday collimator (3) and the optical fiber (4) are optically coupled through the coupling adhesive (9).

5. The packaging structure of the fiber optic voltage sensing head according to claim 2, characterized in that, The top of the box (11) is provided with an annular insert groove (116) around its top opening; the top cover (12) is fitted into the annular insert groove (116), and the inner wall of the top cover (12) is provided with a positioning boss (121) that can fit and press against the top surface of the BGO crystal (2).

6. The packaging structure of the fiber optic voltage sensing head according to claim 2, characterized in that, The electrode assembly (5) includes an electrode clamp (51), an electrode rod (52), and an elastic element (53); the electrode clamp (51) is located between the BGO crystal (2) and the side wall (112); one end of the electrode rod (52) passes through the through hole (1121) and is vertically fixed on the surface of the electrode clamp (51); one end of the elastic element (53) abuts against the side wall (112) and the other end abuts against the electrode clamp (51), thereby the electrode clamp (51) presses against the BGO crystal (2); The second electrode assembly (6) includes a second electrode clamp (61), a second electrode rod (62), and a second elastic element (63). The second electrode clamp (61) is located between the BGO crystal (2) and the third side wall (113). One end of the second electrode rod (62) passes through the second through hole (1131) and is vertically fixed on the surface of the second electrode clamp (61). One end of the second elastic element (63) abuts against the third side wall (113), and the other end abuts against the second electrode clamp (61), thereby pressing the second electrode clamp (61) against the BGO crystal (2). The first electrode clamp (51) is parallel to the surface of the second electrode clamp (61) and together clamps and positions the BGO crystal (2).

7. The packaging structure of the fiber optic voltage sensing head according to claim 6, characterized in that, Both electrode clamp one (51) and electrode clamp two (61) are gold-plated copper plates; both electrode rod one (52) and electrode rod two (62) are gold-plated copper rods.

8. The packaging structure of the fiber optic voltage sensing head according to claim 1, characterized in that, The enclosed insulating shell (1) is a ceramic shell.

9. The packaging structure of the fiber optic voltage sensing head according to claim 1, characterized in that, The intermediate filler layer (7) is a UV-curable adhesive layer.

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