A thermal instrument terminal box for thermal power plant

Abstract

The utility model relates to the technical field of instrument terminal box, specifically is a thermal power plant thermal instrument terminal box, include: terminal box main part, incoming line hole, the incoming line hole is set up in the surface of terminal box main part, main line, main line sliding connection is in the incoming line hole, through the innovative mechanical interlock positioning structure, realized the accurate positioning and quick fixing of main line installation, effectively solved the problem that the traditional terminal box is not accurate, the core lies in the ratchet pawl type positioning assembly that adopts by the positioning clamping block and the clamping block, cooperation first spring provides automatic reset locking force, when main line inserts, positioning clamping block slides along the inclined plane of clamping block and is locked automatically, the boss on its surface can effectively prevent main line rotation. This design not only guarantees the accurate alignment between main line and terminal, makes the wiring operation become convenient and reliable, more eliminates the poor contact hidden danger caused by installation deviation from the root, significantly improves the wiring quality and the security of long-term operation.

Description

Technical Field

[0001] This utility model relates to the field of instrument junction box technology, and in particular to a junction box for thermal power plant thermal instruments. Background Technology

[0002] Junction boxes for thermal instrumentation in power plants are critical connection components in thermal control systems, undertaking the core functions of signal collection, transfer, and protection between field instruments and the control system. They typically employ explosion-proof, corrosion-resistant, and waterproof designs to meet the harsh environmental requirements of power plants, including high temperatures, high dust levels, and strong electromagnetic interference. The internal structure utilizes a modular terminal block design, enabling centralized wiring of multiple signals from field instruments such as thermocouples, RTDs, and transmitters. Internal wiring channels facilitate signal grouping and isolation, effectively preventing mutual interference between different signals. The housing is mostly made of aluminum alloy or stainless steel, with powder coating or electroplating, and boasts an IP65 or higher protection rating, ensuring long-term stable operation in humid and salt spray environments. Advanced junction boxes also integrate electrical protection modules such as overvoltage protection and lightning surge protection, and employ a dual-redundant wiring design to improve system reliability. Standardized interfaces and armored cable sealing joints ensure both the integrity of signal transmission and the mechanical fixation and environmental sealing of cables. This device not only simplifies the complexity of on-site wiring, but also greatly improves maintenance efficiency through centralized management. It is an important infrastructure to ensure the accurate transmission of operating data of boiler control systems, turbine monitoring systems and auxiliary equipment in thermal power plants, and is directly related to the safety and economy of unit operation.

[0003] In existing technologies, during the installation of current junction boxes, multiple branch lines are typically combined into a single main line before being connected to the box. However, due to the lack of an effective positioning structure inside the junction box, the main line is prone to positional shift during installation and fixing, making it difficult to accurately align with the preset wiring positions. This shift can lead to alignment deviations between the end of the main line and the wires to be connected inside the box, posing a potential risk to the stable operation of the subsequent system. Utility Model Content

[0004] The purpose of this utility model is to provide a junction box for thermal instruments in thermal power plants to solve the above-mentioned problems. It improves the problem that the main line is prone to positional deviation during installation and fixing due to the lack of an effective positioning structure inside the junction box, making it difficult to accurately align with the preset wiring position. This deviation will cause a misalignment between the end of the main line and the wire to be connected in the box.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a junction box for thermal instruments in a thermal power plant, comprising: Junction box body; A cable inlet hole is provided on the surface of the junction box body; The main line is slidably connected inside the inlet hole; The positioning blocks are provided in multiple ways, and each of the multiple positioning blocks is fixedly connected to the circumferential surface of the main line; The positioning assembly is provided in multiple sets. Each set of the positioning assembly includes a fixing plate, a snap-fit ​​block, and a first spring. There are two fixing plates and two first springs. The two fixing plates are fixedly connected to the inner wall of the junction box body. The snap-fit ​​block is rotatably connected to the surface of the two fixing plates through a rotating shaft. The snap-fit ​​block matches the positioning snap-fit ​​block. The two first springs are respectively fixedly connected to the surface of the two fixing plates. The two first springs are fixedly connected to the snap-fit ​​block.

[0006] Preferably, each of the multiple positioning blocks has two protrusions fixedly connected to its surface. When the positioning block is connected to the locking block, the protrusions prevent the positioning block from rotating.

[0007] Preferably, the surfaces of the plurality of snap-fit ​​blocks are provided with inclined surfaces, which match the positioning snap-fit ​​blocks. When disassembly is required, the positioning snap-fit ​​blocks are pushed to contact the inclined surfaces on the surfaces of the snap-fit ​​blocks, causing the snap-fit ​​blocks to rotate around the pivot. The protrusions disengage from the surfaces of the snap-fit ​​blocks, and then the main line is rotated to remove the positioning snap-fit ​​blocks from the snap-fit ​​blocks, which is convenient for disassembly.

[0008] Preferably, the inner circumferential wall of the inlet hole is provided with multiple sets of sealing components. Each set of sealing components includes a groove, a second spring, and a conical slide plate. The groove is opened on the inner circumferential wall of the inlet hole, the conical slide plate is slidably connected in the groove, the second spring is fixedly connected to the inner wall of the groove, and the second spring is fixedly connected to the surface of the conical slide plate.

[0009] Preferably, the inlet hole is threaded with a threaded ring, which is slidably connected to the circumferential surface of the main wire, and multiple push plates are fixedly connected to the circumferential surface of the threaded ring.

[0010] Preferably, a sealing plate is fixedly connected to the circumferential surface of the threaded ring, and the sealing plate is connected to the outer surface of the junction box body.

[0011] Preferably, a cover plate is movably hinged to the surface of the junction box body via a hinge shaft.

[0012] The beneficial effects of this utility model are: 1. This solution utilizes an innovative mechanical interlocking positioning structure to achieve precise positioning and rapid fixing of the main line, effectively solving the problem of inaccurate alignment in traditional junction boxes. The core of this solution lies in the use of a ratchet-type positioning assembly consisting of a positioning block and a locking block, coupled with a first spring providing automatic reset and locking force. When the main line is inserted, the positioning block slides along the inclined surface of the locking block and automatically locks, while the protrusions on its surface effectively prevent the main line from rotating. This design not only ensures precise alignment between the main line and the terminal block, making wiring operations convenient and reliable, but also eliminates the potential for poor contact caused by installation misalignment, significantly improving wiring quality and long-term operational safety.

[0013] 2. In this solution, a modular design with multiple sealing mechanisms enhances ease of operation while ensuring a high level of protection for the junction box in harsh industrial environments. The equipment employs a dual sealing system combining a dynamic seal consisting of a conical sliding plate and a second spring with an end-face seal consisting of a threaded ring and a sealing plate. When the threaded ring is tightened, the push plate simultaneously presses all the conical sliding plates together, ensuring they adhere tightly to the main line and form a uniform sealing force. This structure guarantees IP65 or higher protection performance and allows for rapid adjustment of the sealing effect through the tightness of the threaded ring. Combined with a flip-up cover, this forms a sealing protection system that spans the entire installation, wiring, and maintenance cycle, greatly improving adaptability and reliability in the high-dust and high-humidity environments of thermal power plants. Attached Figure Description

[0014] Figure 1 This is a first-view perspective perspective view of the present invention; Figure 2 This is a second-view perspective perspective view of the present invention; Figure 3 This utility model Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a cross-sectional view of the present invention; Figure 5 This utility model Figure 4 A magnified view of a section at point B in the middle.

[0015] In the diagram: 1. Junction box body; 2. Cover plate; 3. Main line; 4. Fixing plate; 5. Snap-fit ​​block; 6. First spring; 7. Positioning block; 8. Protrusion; 9. Inclined surface; 10. Slide groove; 11. Second spring; 12. Conical slide plate; 13. Threaded ring; 14. Sealing plate; 15. Push plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In practical implementation: such as Figures 1-5 As shown, a junction box for thermal instruments in a thermal power plant includes: Junction box body 1; The cable inlet is located on the surface of the junction box body 1. Main line 3 is slidably connected inside the inlet hole; Positioning blocks 7, which are provided in multiples, are all fixedly connected to the circumferential surface of the main line 3; The positioning assembly is provided in multiple sets. Each positioning assembly includes a fixing plate 4, a snap-fit ​​block 5, and a first spring 6. There are two fixing plates 4 and two first springs 6. The two fixing plates 4 are fixedly connected to the inner wall of the junction box body 1. The snap-fit ​​block 5 is rotatably connected to the surface of the two fixing plates 4 through a rotating shaft. The snap-fit ​​block 5 matches the positioning snap-fit ​​block 7. The two first springs 6 are respectively fixedly connected to the surface of the two fixing plates 4. The two first springs 6 are fixedly connected to the snap-fit ​​block 5.

[0018] In this embodiment, the junction box includes a junction box body 1 with a wire inlet hole on its surface, into which the main wire 3 is slidably connected. Multiple positioning blocks 7 are fixedly connected to the circumferential surface of the main wire 3. The key positioning components are provided in multiple sets, each set including two fixing plates 4 fixedly connected to the inner wall of the junction box body 1, a locking block 5 rotatably connected to the surfaces of the two fixing plates 4 via a rotating shaft, and two first springs 6 respectively fixedly connected to the surfaces of the fixing plates 4 and fixed to the locking blocks 5. When the main wire 3 is inserted, the positioning blocks 7 press against the inclined surfaces of the locking blocks 5, causing them to rotate and compressing the first springs 6. After the positioning blocks 7 pass the locking blocks 5, the locking blocks 5 reset under the restoring force of the first springs 6 and lock the positioning blocks 7, thereby achieving precise axial and circumferential positioning of the main wire and ensuring accurate alignment with the internal wiring terminals.

[0019] like Figures 1-5 As shown, each of the multiple positioning blocks 7 has two protrusions 8 fixedly connected to its surface. When the positioning block 7 is connected to the locking block 5, the protrusions 8 prevent the positioning block 7 from rotating.

[0020] In this embodiment, two protrusions 8 are fixedly connected to the surface of each of the multiple positioning blocks 7. When the positioning block 7 and the locking block 5 are engaged, the two protrusions 8 will abut against the two sides of the locking block 5 respectively, effectively preventing the main line 3 from rotating unexpectedly when subjected to external force, thereby avoiding displacement of the connection point or loosening of the connection due to the rotation of the main line, and further improving the mechanical stability of the connection.

[0021] like Figures 1-5 As shown, the surfaces of multiple snap-fit ​​blocks 5 are provided with inclined surfaces 9, which match the positioning snap-fit ​​blocks 7. When disassembly is required, push the positioning snap-fit ​​blocks 7 to contact the inclined surfaces 9 on the surface of the snap-fit ​​blocks 5, so that the snap-fit ​​blocks 5 can rotate around the pivot, and the protrusions 8 can be disengaged from the surface of the snap-fit ​​blocks 5. Then, rotate the main line 3 to remove the positioning snap-fit ​​blocks 7 from the snap-fit ​​blocks 5, which is convenient for disassembly.

[0022] In this embodiment, each of the multiple snap-fit ​​blocks 5 has a beveled surface 9, the angle of which matches the contour of the positioning snap-fit ​​block 7. When the main cable needs to be disassembled, simply pull the main cable 3 outward to bring the positioning snap-fit ​​block 7 into contact with the beveled surface 9. The beveled surface 9 will convert the pulling force into a torque that causes the snap-fit ​​block 5 to rotate around the pivot. When the snap-fit ​​block 5 rotates, it compresses the first spring 6, thereby causing the protrusion 8 to disengage from the constraint of the snap-fit ​​block 5. Then, by rotating the main cable 3, the positioning snap-fit ​​block 7 can slide out of the snap-fit ​​block 5's slot, completing the disassembly. This design enables quick and non-destructive disassembly and assembly of the main cable, facilitating maintenance.

[0023] like Figures 1-5 As shown, the inner circumferential wall of the inlet hole is provided with multiple sets of sealing components. Each set of sealing components includes a slide groove 10, a second spring 11, and a conical slide plate 12. The slide groove 10 is opened on the inner circumferential wall of the inlet hole. The conical slide plate 12 is slidably connected in the slide groove 10. The second spring 11 is fixedly connected to the inner wall of the slide groove 10 and the surface of the conical slide plate 12.

[0024] In this embodiment, multiple sealing components are provided on the inner circumferential wall of the inlet hole. Each component includes a groove 10 formed in the inner wall of the inlet hole, a second spring 11 fixedly connected to the inner wall of the groove 10, and a conical slide plate 12 slidably connected in the groove 10 and fixed to the second spring 11. After the main line 3 is inserted, the multiple conical slide plates 12 extend from their grooves 10 under the preload of the second spring 11 and closely fit the circumferential surface of the main line 3, forming multiple annular seals, effectively preventing external dust, moisture, and other contaminants from entering the junction box through the gap in the inlet hole.

[0025] like Figures 1-5 As shown, a threaded ring 13 is threadedly connected to the inlet hole. The threaded ring 13 is slidably connected to the circumferential surface of the main wire 3. Multiple push plates 15 are fixedly connected to the circumferential surface of the threaded ring 13.

[0026] In this embodiment: A threaded ring 13 is threaded into the inlet hole, and the threaded ring 13 is simultaneously slidably fitted onto the circumferential surface of the main wire 3. Multiple push plates 15 are fixedly connected to the circumferential surface of the threaded ring 13. When the threaded ring 13 is tightened, it moves inward, pushing the tapered sliding plate 12 more tightly against the main wire 3 via the push plates 15, thereby further enhancing the sealing effect and providing additional clamping force.

[0027] like Figures 1-5 As shown, a sealing plate 14 is fixedly connected to the circumferential surface of the threaded ring 13, and the sealing plate 14 is connected to the outer surface of the junction box body 1.

[0028] In this embodiment, a sealing plate 14 is fixedly connected to the circumferential surface of the threaded ring 13. When the threaded ring 13 is tightened, the sealing plate 14 will fit tightly against the outer surface of the junction box body 1, forming an external sealing barrier. Together with the internal conical slide plate 12, it constitutes a double sealing protection, which greatly improves the protection level of the junction box in harsh industrial environments.

[0029] like Figures 1-5 As shown, a cover plate 2 is movably hinged to the surface of the junction box body 1 via a hinge shaft.

[0030] In this embodiment, a cover plate 2 is hinged to the surface of the junction box body 1 via a hinge shaft. This design allows operators to easily open the cover plate 2 like opening a door to inspect, connect, or maintain the terminals and wiring inside the junction box. After the work is completed, the cover plate 2 can be easily closed to restore its protective state, greatly improving the maintainability of the equipment.

[0031] In use, the operator first opens the cover plate 2 hinged to the junction box body 1 and passes the main cable 3 through the loosened threaded ring 13 and the inlet hole. When the positioning block 7 on the main cable 3 contacts the inclined surface 9 of the locking block 5, it will press the locking block 5 to overcome the elastic force of the first spring 6 and rotate around the axis. After the positioning block 7 has completely passed through, the locking block 5 quickly resets under the action of the first spring 6, and its locking slot accurately engages with the positioning block 7. At this time, the protrusion 8 on the surface of the positioning block 7 is tightly fitted with both sides of the locking block 5, realizing the axial and circumferential double fixation of the main cable. Then, the threaded ring 13 is tightened, and the push plate 15 on its inner side is pushed forward, pressing the conical slide plate 12 to slide in the slide groove 10 and compressing the second spring 11, so that the conical slide plate 12 presses tightly against the surface of the main cable 3 to form a dynamic seal. At the same time, the sealing plate 14 on the threaded ring 13 is tightly attached to the outer surface of the junction box body 1 to form an external seal. After the main line is positioned and sealed, the operator can accurately and easily connect the core of the main line 3 to the corresponding terminal inside the junction box. When disassembly is required, loosen the threaded ring 13 to release the sealing pressure, and gently pull the main line 3 outward to make the positioning block 7 contact the inclined surface 9, forcing the locking block 5 to rotate. After the protrusion 8 disengages, rotating the main line 3 will allow the positioning block 7 to disengage from the locking block 5, completing the disassembly.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A thermal instrument terminal box for a fossil fuel power plant, characterized by, include: Junction box body (1); The inlet hole is provided on the surface of the junction box body (1); Main line (3), which is slidably connected in the inlet hole; Positioning blocks (7) are provided in multiple ways, and all of the positioning blocks (7) are fixedly connected to the circumferential surface of the main line (3); The positioning assembly is provided in multiple sets. Each set of the positioning assembly includes a fixing plate (4), a snap-fit ​​block (5), and a first spring (6). There are two fixing plates (4) and two first springs (6). The two fixing plates (4) are fixedly connected to the inner wall of the junction box body (1). The snap-fit ​​block (5) is rotatably connected to the surface of the two fixing plates (4) through a rotating shaft. The snap-fit ​​block (5) matches the positioning snap-fit ​​block (7). The two first springs (6) are fixedly connected to the surface of the two fixing plates (4) respectively. The two first springs (6) are fixedly connected to the snap-fit ​​block (5).

2. A thermal instrument terminal box for a thermal power plant according to claim 1, characterized in that: Each of the multiple positioning blocks (7) has two protrusions (8) fixedly connected to its surface. When the positioning block (7) is connected to the locking block (5), the protrusions (8) prevent the positioning block (7) from rotating.

3. A thermal instrument terminal box for a thermal power plant according to claim 2, characterized in that: Each of the multiple snap-fit ​​blocks (5) has a bevel (9) on its surface. The bevel (9) matches the positioning snap-fit ​​block (7). When disassembly is required, push the positioning snap-fit ​​block (7) to contact the bevel (9) on the surface of the snap-fit ​​block (5), so that the snap-fit ​​block (5) rotates around the pivot and the protrusion (8) disengages from the surface of the snap-fit ​​block (5). Then, rotate the main line (3) to remove the positioning snap-fit ​​block (7) from the snap-fit ​​block (5), which is convenient for disassembly.

4. A thermal instrument terminal box for a thermal power plant according to claim 3, characterized in that: The inner circumferential wall of the inlet hole is provided with multiple sets of sealing components. Each set of sealing components includes a groove (10), a second spring (11), and a conical slide plate (12). The groove (10) is opened on the inner circumferential wall of the inlet hole. The conical slide plate (12) is slidably connected in the groove (10). The second spring (11) is fixedly connected to the inner wall of the groove (10) and the second spring (11) is fixedly connected to the surface of the conical slide plate (12).

5. A thermal instrument terminal box for a fossil fuel power plant according to claim 4, characterized in that: The inlet hole is threaded with a threaded ring (13), which is slidably connected to the circumferential surface of the main line (3). Multiple push plates (15) are fixedly connected to the circumferential surface of the threaded ring (13).

6. A thermal instrument terminal box for a fossil fuel power plant according to claim 5, characterized in that: A sealing plate (14) is fixedly connected to the circumferential surface of the threaded ring (13), and the sealing plate (14) is connected to the outer surface of the junction box body (1).

7. A junction box for thermal instruments in a thermal power plant according to claim 6, characterized in that: The surface of the junction box body (1) is hinged to a cover plate (2) via a hinge shaft.

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