Enclosed bus optical fiber temperature on-line monitoring sensor

Abstract

The utility model discloses an enclosed bus optical fiber temperature on-line monitoring sensor, which is suitable for an enclosed bus shell and comprises an optical cable, a connecting assembly and a fixing assembly. The connecting assembly comprises a corrugated pipe, a bolt head, a first sealing ring, a sealing ring fixing piece, a first stud, a second sealing ring, a third sealing ring and a second stud, and the corrugated pipe, the bolt head, the first sealing ring, the sealing ring fixing piece, the first stud, the second sealing ring, the third sealing ring and the second stud are sequentially connected to the optical cable in a sleeved mode from left to right. The optical cable can penetrate through the enclosed bus shell, the optical cable and the corrugated pipe can be fixed, the optical cable and the corrugated pipe do not move relative to the enclosed bus shell, and therefore the abnormal conditions that the optical cable slips off, a temperature measuring system fails and the like are avoided, and the connecting position of the first stud and the second stud is sealed through the second sealing ring and the third sealing ring. And the first sealing ring and the sealing ring fixing piece seal the joint of the corrugated pipe and the first stud, so that the air tightness of the enclosed bus shell is not damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber temperature measurement, in particular to a closed busbar optical fiber temperature online monitoring sensor. Background Art

[0002] Fiber optic temperature sensor is a new type of temperature sensor developed in the 1970s and is a major product in the fiber optic sensor family. Fiber optic temperature sensor transmits information based on optical signals. Due to its advantages of insulation, anti-electromagnetic interference, and high voltage resistance, it has developed rapidly in recent years and has been applied to many fields, achieving good results.

[0003] In the field of temperature measurement of isolated closed busbars, since busbars are often used for the transmission of high-power electric energy, they generate large currents and a lot of heat during operation, which requires greater temperature monitoring. In addition, due to the high-current working environment, traditional electrical temperature sensors are difficult to meet the temperature measurement requirements, and it is difficult to locate the specific heating points by infrared temperature measurement outside the closed busbar box. In the field of closed busbar temperature measurement, the demand for optical fiber temperature sensors has emerged.

[0004] We have noticed that some practitioners have adopted fluorescent fiber optic temperature sensors to monitor the temperature of closed busbars. However, they use holes in the busbar box wall to achieve the internal and external penetration of the optical fiber. The fixing reliability and sealing performance of this method need to be improved. External pulling of the optical cable may cause the optical cable to be displaced by force, and it cannot be used in gas sealing scenarios. The probe position is directly fixed with bolts, and the temperature probe is continuously under pressure, which poses a risk to long-term reliability and is inconvenient to install.

[0005] Therefore, it is necessary to develop a closed busbar optical fiber temperature online monitoring sensor that can be used in sealed scenarios and has high reliability in fixing the optical fiber and temperature sensing probe. Utility Model Content

[0006] 1. Technical problems to be solved by the utility model

[0007] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an online monitoring sensor for the temperature of an enclosed busbar optical fiber, which can fix the optical cable and the corrugated tube to the enclosed busbar housing without relative movement with the enclosed busbar housing to avoid the optical cable slipping, and has good sealing performance at the connection with the enclosed busbar housing without destroying the airtightness of the enclosed busbar housing.

[0008] 2. Technical solution

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A closed busbar optical fiber temperature online monitoring sensor is suitable for a closed busbar housing, comprising an optical cable, a connecting assembly and a fixing assembly, wherein the connecting assembly comprises a corrugated tube, a bolt head, a first sealing ring, a sealing ring fixing piece, a first stud bolt, a second sealing ring, a third sealing ring and a second stud bolt which are sequentially sleeved on the optical cable from left to right, wherein the first stud bolt is connected to the second stud bolt, the second sealing ring and the third sealing ring are used to seal the space between the first stud bolt and the second stud bolt, the corrugated tube is connected to the first stud bolt through the bolt head, the first sealing ring and the sealing ring fixing piece are used to seal the space between the corrugated tube and the first stud bolt, a preset threaded hole is provided on the side wall of the closed busbar housing, the second stud bolt is connected to the preset threaded hole, the fixing assembly is arranged at the right end of the optical cable, a temperature measuring point is provided inside the closed busbar housing, and the fixing assembly is connected and fixed to the temperature measuring point.

[0011] Preferably, a first external thread is provided on the outer side of one end of the first stud bolt close to the bolt head, and the bolt head is threadedly connected to the first stud bolt via the first external thread.

[0012] Preferably, a cylindrical through hole is opened inside the first stud bolt at one end of the first external thread, and the first sealing ring is assembled and compressed with the sealing ring fixing piece and installed in the cylindrical through hole, the first sealing ring is a hemispherical structure, and a retaining ring abutting against the first sealing ring is provided on the inner side of the bolt head away from one end of the first sealing ring, and one end of the bellows passes through the bolt head and is placed in the first sealing ring.

[0013] Preferably, a hemispherical hole communicating with the cylindrical through hole is formed at the other end of the first stud bolt, the diameter of the hemispherical hole is smaller than the diameter of the cylindrical through hole, an internal thread is formed on the inner wall of the hemispherical hole, and a second external thread is formed on the outer side of one end of the second stud bolt close to the first stud bolt, and the first stud bolt and the second stud bolt are threadedly connected via the internal thread and the second external thread.

[0014] Preferably, a mounting hole is opened inside the second stud bolt at one end of the second external thread, the second sealing ring is sleeved on the outside of the third sealing ring, the second sealing ring and the third sealing ring are installed in the mounting hole, and a hollow locking tooth is provided at one end of the second sealing ring and can abut against the inner wall of the hemispherical hole.

[0015] Preferably, the first sealing ring and the third sealing ring are made of flexible materials with good airtightness and compressible assembly, and the second sealing ring is made of a material with certain rigidity and plasticity.

[0016] Preferably, a third external thread is provided on the outer side of the other end of the second stud bolt, and the second stud bolt is threadedly connected in the preset threaded hole through the third external thread.

[0017] Preferably, the fixing component includes an optical cable threaded head fixedly connected to the outside of one end of the optical cable and a temperature sensor, one end of the temperature sensor is threadedly connected to the optical cable threaded head, and the other end of the temperature sensor is provided with an open groove, the temperature sensor is clamped on the temperature measuring point through the open groove and is fixed by bolt and nut connectors.

[0018] Preferably, an optical fiber and a temperature sensing probe are provided inside the optical cable, and the temperature sensing probe is connected to the temperature sensing body.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] (1) The utility model is connected to the preset threaded hole of the closed busbar housing by the second stud bolt, so that the optical cable can pass through the closed busbar housing, and can fix the optical cable and the corrugated tube so that they do not move relative to the closed busbar housing, thereby causing the optical cable to slip off, the temperature measurement system to fail, and other abnormal situations. The second sealing ring and the third sealing ring are used to seal the connection between the first stud bolt and the second stud bolt, and the first sealing ring and the sealing ring fixing member are used to seal the connection between the corrugated tube and the first stud bolt, without destroying the airtightness of the closed busbar housing.

[0022] (2) The utility model clamps the opening groove of the temperature sensing body at the position of the bolt and nut connector at the temperature measuring point, and then connects and fixes the temperature sensing body and the temperature measuring point through the bolt and nut connector. This can achieve the fixation of the temperature sensing body and the temperature measuring point without damaging the optical fiber and the temperature sensing probe inside the optical cable, and has the function of protecting the optical fiber and the temperature sensing probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall split three-dimensional structure of the closed busbar optical fiber temperature online monitoring sensor;

[0024] Figure 2 is a cross-sectional structural diagram of a connection component;

[0025] Figure 3 It is a cross-sectional structural diagram of the fixed component;

[0026] Figure 4 This is a structural schematic diagram of the closed busbar optical fiber temperature online monitoring sensor installed in the closed busbar housing.

[0027] In the figure: 1. optical cable; 2. bellows; 3. bolt head; 4. first sealing ring; 5. sealing ring fixing piece; 6. first stud bolt; 601. first external thread; 602. cylindrical through hole; 603. internal thread; 7. second sealing ring; 8. third sealing ring; 9. second stud bolt; 901. second external thread; 902. third external thread; 903. mounting hole; 10. optical cable threaded head; 11. temperature sensing body; 1101. open groove; 12. temperature sensing probe; a. closed busbar housing; b. preset threaded hole; c. temperature measuring point; d. bolt and nut connector. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] Example:

[0030] See also Figure 1-Figure 4 The present embodiment provides a closed busbar optical fiber temperature online monitoring sensor, which is suitable for a closed busbar housing a, including an optical cable 1, a connecting assembly and a fixing assembly. The connecting assembly includes a corrugated tube 2, a bolt head 3, a first sealing ring 4, a sealing ring fixing member 5, a first stud bolt 6, a second sealing ring 7, a third sealing ring 8 and a second stud bolt 9, which are sequentially sleeved on the optical cable 1 from left to right. The first stud bolt 6 is connected to the second stud bolt 9, and the second sealing ring 7 and the third sealing ring 8 are used to seal the space between the first stud bolt 6 and the second stud bolt 9. The corrugated tube 2 is connected to the first stud bolt 6 through the bolt head 3, and the first sealing ring 4 and the sealing ring fixing member 5 are used to seal the space between the corrugated tube 2 and the first stud bolt 6. The side wall of the closed busbar housing a is provided with a A preset threaded hole b is provided, and a second stud bolt 9 is connected to the preset threaded hole b. A fixing assembly is arranged at the right end of the optical cable 1. A temperature measuring point c is provided inside the closed busbar housing a. The fixing assembly is connected and fixed to the temperature measuring point c. The utility model is connected to the preset threaded hole b of the closed busbar housing a by the second stud bolt 9, so that the optical cable 1 can pass through the closed busbar housing a, and the optical cable 1 and the bellows 2 can be fixed so that they do not move relative to the closed busbar housing a, thereby causing the optical cable 1 to slip, the temperature measuring system to fail, and other abnormal situations to occur. The connection between the first stud bolt 6 and the second stud bolt 9 is sealed by the second sealing ring 7 and the third sealing ring 8, and the connection between the first stud bolt 6 and the second stud bolt 9 is sealed by the first sealing ring 4 and the sealing ring fixing member 5, and the connection between the bellows 2 and the first stud bolt 6 is sealed without destroying the airtightness of the closed busbar housing a.

[0031] In this embodiment, if Figure 1 and Figure 2 As shown, the first stud bolt 6 is provided with a first external thread 601 on the outer side near the end of the bolt head 3, the bolt head 3 and the first stud bolt 6 are threadedly connected through the first external thread 601, the first stud bolt 6 is provided with a cylindrical through hole 602 at one end of the first external thread 601, the first sealing ring 4 and the sealing ring fixing member 5 are assembled and pressed and installed in the cylindrical through hole 602, the first sealing ring 4 is a hemispherical structure, the inner side of the bolt head 3 away from the end of the first sealing ring 4 is provided with a retaining ring that abuts against the first sealing ring 4, one end of the bellows 2 passes through the bolt head 3 and is placed on the first sealing ring 4 During assembly, one end of the bellows 2 is passed through the bolt head 3 and the end of the bellows 2 is placed in the first sealing ring 4, and then the bolt head 3 and the first stud bolt 6 are threadedly connected and tightened through the first external thread 601, and the first sealing ring 4 and the sealing ring fixing part 5 are combined and pressed and installed in the cylindrical through hole 602, and the end of the first sealing ring 4 is deformed by contact with the retaining ring of the bolt head 3, and the first sealing ring 4 is pressed against the outside of the end of the bellows 2 to fix the position of the bellows 2 and the first stud bolt 6, and to achieve sealing at the connection between the bellows 2 and the first stud bolt 6.

[0032] In this embodiment, if Figure 1 and Figure 2 As shown, the other end of the first stud bolt 6 is provided with a hemispherical hole connected to the cylindrical through hole 602, the diameter of the hemispherical hole is smaller than the diameter of the cylindrical through hole 602, the inner wall of the hemispherical hole is provided with an internal thread 603, the outer side of the end of the second stud bolt 9 close to the first stud bolt 6 is provided with a second external thread 901, the first stud bolt 6 and the second stud bolt 9 are threadedly connected through the internal thread 603 and the second external thread 901, the second stud bolt 9 is provided with a mounting hole 903 inside the second external thread 901 end, the second sealing ring 7 is sleeved on the outside of the third sealing ring 8, and the second sealing ring 7 and the third sealing ring 8 are installed in the mounting hole 9 03, one end of the second sealing ring 7 is provided with a hollow tooth and can abut against the inner wall of the hemispherical hole. During assembly, the second sealing ring 7 and the third sealing ring 8 are installed in the mounting hole 903 by threading the first stud 6 and the second stud 9 through the internal thread 603 and the second external thread 901 to tighten them, and the end of the second sealing ring 7 with the hollow tooth is pressed against the inner wall of the hemispherical hole of the first stud 6 to deform the hollow tooth part and clamp the third sealing ring 8 on the outside of the optical cable 1, so that the position on the optical cable 1 can be fixed and the connection between the first stud 6 and the second stud 9 can be sealed.

[0033] In this embodiment, it should be noted that the first sealing ring 4 and the third sealing ring 8 are flexible materials with good airtightness and can be compressed and assembled, preferably rubber, and the second sealing ring 7 is a material with certain rigidity and plasticity, so that the hollow teeth of the second sealing ring 7 can be compressed and deformed to clamp the third sealing ring 8, preferably plastic.

[0034] In this embodiment, if Figure 1 and Figure 4 As shown, a third external thread 902 is provided on the outer side of the other end of the second stud bolt 9, and the second stud bolt 9 is threadedly connected in the preset threaded hole b through the third external thread 902. The second stud bolt 9 is conveniently connected in the preset threaded hole b through the third external thread 902, and can fix the optical cable 1 and the corrugated tube 2 on the closed busbar housing a to avoid displacement. It should be noted that the length of the second stud bolt 9 can be set according to demand to adapt to closed busbar housings a of different thicknesses.

[0035] In this embodiment, if Figure 1 , Figure 3 and Figure 4 As shown, the fixing component includes an optical cable threaded head 10 fixedly connected to the outside of one end of the optical cable 1 and a temperature sensing body 11, one end of the temperature sensing body 11 is threadedly connected to the optical cable threaded head 10, and the other end of the temperature sensing body 11 is provided with an open groove 1101, the temperature sensing body 11 is clamped on the temperature measuring point c through the open groove 1101 and is connected and fixed by a bolt and nut connector d, an optical fiber and a temperature sensing probe 12 are provided inside the optical cable 1, and the temperature sensing probe 12 is connected to the temperature sensing body 11. It should be noted that different numbers of optical fibers and temperature sensing probes 12 can be arranged inside the optical cable according to needs, and the open groove 1101 of the temperature sensing body 11 is clamped at the position of the bolt and nut connector d at the temperature measuring point c, and then the temperature sensing body 11 is connected and fixed to the temperature measuring point c through the bolt and nut connector d, which can realize the fixation of the temperature sensing body 11 and the temperature measuring point c without damaging the optical fiber and the temperature sensing probe 12 inside the optical cable 1, and has the function of protecting the optical fiber and the temperature sensing probe 12.

[0036] In this embodiment, the other end of the bellows 2 can be extended to other devices of the temperature measurement system, such as a temperature demodulator. The material of the bellows 2 can be selected by the user. Considering the protection function of the bellows 2 to the internal optical cable 1, a metal material can be selected. Considering the insulation, a plastic material can be selected.

[0037] Working principle: When in use, first pass the optical cable 1 through the loose corrugated tube 2, bolt head 3, first sealing ring 4, sealing ring fixing part 5, first stud bolt 6, second sealing ring 7, third sealing ring 8, second stud bolt 9 and the preset threaded hole b of the closed busbar housing a in sequence, pull the optical cable 1 out to a suitable distance, and the opening groove 1101 of the temperature sensing body 11 is stuck in the position of the bolt and nut connector d of the temperature measuring point c, and then connect and fix the temperature sensing body 11 to the temperature measuring point c through the bolt and nut connector d, and then tighten the corrugated tube 2. The end passes through the bolt head 3 and the end of the bellows 2 is placed in the first sealing ring 4, the bolt head 3 and the first stud bolt 6 are threadedly connected and tightened through the first external thread 601, the first sealing ring 4 and the sealing ring fixing member 5 are combined and pressed and installed in the cylindrical through hole 602, and the end of the first sealing ring 4 is deformed by contacting the retaining ring of the bolt head 3, and the first sealing ring 4 is pressed against the outer side of the end of the bellows 2 to fix the position of the bellows 2 and the first stud bolt 6, and to achieve sealing at the connection between the bellows 2 and the first stud bolt 6, and then , the first stud bolt 6 and the second stud bolt 9 are threadedly connected and tightened through the internal thread 603 and the second external thread 901, the second sealing ring 7 and the third sealing ring 8 are installed in the installation hole 903, the end of the second sealing ring 7 with the hollow clamping teeth is pressed against the inner wall of the hemispherical hole of the first stud bolt 6, the hollow clamping teeth part is deformed, and the third sealing ring 8 is clamped on the outside of the optical cable 1, that is, the position on the optical cable 1 can be fixed, and the connection between the first stud bolt 6 and the second stud bolt 9 can be sealed. Finally, The second stud bolt 9 is connected and fixed in the preset threaded hole b through the third external thread 902. The utility model can fix the optical cable 1 and the corrugated tube 2 so that they do not move relative to the closed busbar housing a, thereby causing the optical cable 1 to slip, the temperature measurement system to fail, and other abnormal situations. The second sealing ring 7 and the third sealing ring 8 are used to seal the connection between the first stud bolt 6 and the second stud bolt 9, and the first sealing ring 4 and the sealing ring fixing member 5 are used to seal the connection between the bellows 2 and the first stud bolt 6, without destroying the airtightness of the closed busbar housing a.

[0038] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A closed busbar optical fiber temperature online monitoring sensor, suitable for a closed busbar housing (a), characterized in that: The invention comprises an optical cable (1), a connecting assembly and a fixing assembly, wherein the connecting assembly comprises a corrugated tube (2), a bolt head (3), a first sealing ring (4), a sealing ring fixing member (5), a first stud bolt (6), a second sealing ring (7), a third sealing ring (8) and a second stud bolt (9) which are sleeved on the optical cable (1) in sequence from left to right, wherein the first stud bolt (6) is connected to the second stud bolt (9), and the second sealing ring (7) and the third sealing ring (8) are used to seal the space between the first stud bolt (6) and the second stud bolt (9). The bellows (2) is connected to the first stud bolt (6) via the bolt head (3); the first sealing ring (4) and the sealing ring fixing member (5) are used to seal the space between the bellows (2) and the first stud bolt (6); a preset threaded hole (b) is provided on the side wall of the closed busbar housing (a); the second stud bolt (9) is connected to the preset threaded hole (b); the fixing assembly is arranged at the right end of the optical cable (1); a temperature measuring point (c) is provided inside the closed busbar housing (a); and the fixing assembly is connected and fixed to the temperature measuring point (c).

2. A closed busbar optical fiber temperature online monitoring sensor according to claim 1, characterized in that: A first external thread (601) is provided on the outer side of one end of the first stud bolt (6) close to the bolt head (3), and the bolt head (3) and the first stud bolt (6) are threadedly connected via the first external thread (601).

3. A closed busbar optical fiber temperature online monitoring sensor according to claim 2, characterized in that: The first stud bolt (6) is provided with a cylindrical through hole (602) located at one end of the first external thread (601); the first sealing ring (4) is assembled and pressed with the sealing ring fixing member (5) and then installed in the cylindrical through hole (602); the first sealing ring (4) is a hemispherical structure; a retaining ring abutting against the first sealing ring (4) is provided on the inner side of the end of the bolt head (3) away from the first sealing ring (4); one end of the bellows (2) passes through the bolt head (3) and is placed in the first sealing ring (4).

4. A closed busbar optical fiber temperature online monitoring sensor according to claim 3, characterized in that: The other end of the first stud bolt (6) is provided with a hemispherical hole communicating with the cylindrical through hole (602); the diameter of the hemispherical hole is smaller than the diameter of the cylindrical through hole (602); the inner wall of the hemispherical hole is provided with an internal thread (603); the outer side of one end of the second stud bolt (9) close to the first stud bolt (6) is provided with a second external thread (901); the first stud bolt (6) and the second stud bolt (9) are threadedly connected via the internal thread (603) and the second external thread (901).

5. A closed busbar optical fiber temperature online monitoring sensor according to claim 4, characterized in that: The second stud bolt (9) is provided with a mounting hole (903) at one end of the second external thread (901); the second sealing ring (7) is sleeved on the outside of the third sealing ring (8); the second sealing ring (7) and the third sealing ring (8) are installed in the mounting hole (903); one end of the second sealing ring (7) is provided with a hollow latch tooth and can abut against the inner wall of the hemispherical hole.

6. A closed busbar optical fiber temperature online monitoring sensor according to claim 5, characterized in that: The first sealing ring (4) and the third sealing ring (8) are made of flexible materials with good air tightness and compressible assembly, and the second sealing ring (7) is made of a material with certain rigidity and plasticity.

7. The closed busbar optical fiber temperature online monitoring sensor according to claim 4, characterized in that: A third external thread (902) is provided on the outer side of the other end of the second stud bolt (9), and the second stud bolt (9) is threadedly connected in the preset threaded hole (b) via the third external thread (902).

8. The closed busbar optical fiber temperature online monitoring sensor according to claim 1, characterized in that: The fixing assembly comprises an optical cable threaded head (10) fixedly connected to the outer side of one end of the optical cable (1) and a temperature sensing body (11); one end of the temperature sensing body (11) is threadedly connected to the optical cable threaded head (10); the other end of the temperature sensing body (11) is provided with an open groove (1101); the temperature sensing body (11) is clamped on the temperature measuring point (c) through the open groove (1101) and is connected and fixed by a bolt and nut connecting piece (d).

9. A closed busbar optical fiber temperature online monitoring sensor according to claim 8, characterized in that: An optical fiber and a temperature sensing probe (12) are provided inside the optical cable (1), and the temperature sensing probe (12) is connected to a temperature sensing body (11).

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