A smart low-voltage cable branch box

Abstract

This invention belongs to the technical field of cable distribution boxes, specifically an intelligent low-voltage cable distribution box. It includes a box body and an actuator. Slide rails are fixedly connected to the inner walls of both sides of the box body. Multiple cable holes are pre-drilled at the bottom of the box body. Inflatable sealing rings are installed inside the cable holes, fitted onto the cables. An air inlet pipe is installed on the top of the sealing ring. The actuator includes an air pump fixedly connected to the inner wall of the bottom of the box body. The air pump's outlet is connected to a main air pipe, and multiple branch air pipes on the main air pipe are connected to the air inlet pipe. In this invention, by setting inflatable sealing rings inside the cable holes, and combining them with the actuator consisting of an air pump, main air pipe, branch air pipes, and solenoid valves, a dynamic air replenishment mechanism is formed. When the sealing performance of a sealing ring decreases due to insufficient air pressure, the solenoid valve of the corresponding branch air pipe can be opened in time, and the air pump can restore the seal by inflating the ring. This effectively solves the problem of decreased sealing performance caused by aging and other issues in traditional static sealing structures.

Description

Technical Field

[0001] This invention relates to the field of cable branch box technology, and in particular to an intelligent low-voltage cable branch box. Background Technology

[0002] Cable branch boxes are used as cable branches, and their main function is to connect or transfer cables. With the rapid development of the modernization of the power industry, power grid transformation has been fully launched. When underground main cables need to be distributed to multiple circuits over a certain distance, using cable branch boxes as an important supporting equipment for power distribution is an economical, convenient, and safe method.

[0003] Cables typically enter branch boxes through pre-drilled cable holes. Since these holes are usually located at the bottom of the branch box, water vapor rises into the box, becoming a primary pathway for humid air intrusion. This intrusion is particularly severe in low-lying areas or regions with high water tables. Traditional low-voltage cable branch boxes typically employ static sealing structures, such as rubber sealing rings. However, these sealing structures are susceptible to aging and wear over long-term use, or deterioration in sealing performance due to changes in ambient temperature and pressure. Once the seal fails, water vapor and other impurities can easily enter the box, potentially causing cable short circuits, corrosion of electrical components, and other malfunctions, severely impacting the safe and reliable operation of the power system. Therefore, corresponding improvements are needed to address this issue. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, this invention proposes an intelligent low-voltage cable branch box.

[0005] This invention proposes an intelligent low-voltage cable branch box, comprising a box body and an actuator. The front end of the box body is rotatably connected to a door with a lock. Slide rails are fixedly connected to the inner walls of both sides of the box body, and multiple cable fixing brackets are fixedly connected between the two slide rails. Multiple cable holes are pre-drilled at the bottom of the box body, and each cable hole contains an inflatable sealing ring with an I-shaped cross-section that fits onto the cable. An air inlet pipe is installed on the top of the sealing ring. The actuator includes an air pump fixedly connected to the inner wall of the bottom of the box body. The air pump outlet is connected to a main air pipe, and multiple branch air pipes on the main air pipe are connected to corresponding air inlet pipes. A valve structure is installed on each branch air pipe. If a sealing ring's sealing performance decreases due to insufficient air pressure, simply open the valve structure on the branch air pipe connected to that sealing ring, and then inflate the sealing ring using the air pump. After inflation, close the valve structure to promptly restore the sealing performance of that sealing ring, thus preventing water vapor from entering the box body. This air replenishment mechanism effectively addresses the problem of decreased sealing performance of the sealing rings, significantly enhancing the stability and reliability of the sealing rings under different environmental conditions.

[0006] Preferably, an upper positioning ring and a lower positioning ring are fixedly connected above and below the cable hole, respectively, to cover the sealing ring; the upper and lower positioning rings can limit the outward expansion and deformation of the sealing ring when it is inflated, so that the sealing ring can reach the inflation requirement more quickly and tightly wrap the cable in the middle.

[0007] Preferably, the enclosure is further provided with a sliding mounting bracket located above the cable fixing bracket, and both ends of the sliding mounting bracket are fixed to the slide rail bracket by bolts; the fixed height of the sliding mounting bracket can be adjusted according to the on-site installation conditions, thereby ensuring the flexibility and stability of the installation of cables and other electrical components.

[0008] Preferably, a sponge sleeve for fitting onto the cable is provided in the central hole of the sealing ring, and a notch is reserved on the circumference of the sponge sleeve. The sponge sleeve can be fitted onto the cable and then inserted into the central hole of the sealing ring. When the sealing ring expands, it can compress the sponge sleeve, which will flexibly adapt to the deformed shape of the inner ring of the sealing ring. The sponge sleeve fills the space formed between the cable and the sealing ring, thereby effectively improving the sealing performance between the cable and the sealing ring. Since there is a notch on the sponge sleeve, it can be pried open from the notch and then directly fitted onto the cable, making installation very convenient.

[0009] Preferably, an intelligent low-voltage cable branch box further includes: a humidity acquisition module installed in the middle of the inner wall at the bottom of the box, used to monitor the water vapor concentration inside the box in real time and generate a humidity change coefficient through a control module; a pressure acquisition module embedded in the sealing ring, used to monitor the real-time air pressure of the sealing ring in real time and generate a pressure fluctuation coefficient through a control module; the valve structure is a solenoid valve, and the control module performs comprehensive analysis on the generated humidity change coefficient and pressure fluctuation coefficient to generate an evaluation coefficient, determines whether the actuator needs to inflate the sealing ring, compares the evaluation coefficient with a pre-set evaluation coefficient reference threshold, and executes the working status of the actuator based on the comparison result.

[0010] Preferably, the output and input terminals of the humidity acquisition module and the pressure acquisition module are electrically connected to the input and output terminals of the control module, respectively, and the output terminal of the control module is electrically connected to the input terminal of the air pump and the input terminal of the solenoid valve, respectively.

[0011] Preferably, the execution steps of the control module controlling the working state of the actuator based on the comparison results are as follows:

[0012] Real-time monitoring: The humidity acquisition module collects the water vapor concentration inside the chamber; the pressure acquisition module collects the real-time air pressure of the sealing ring;

[0013] Coefficient Calculation: The control module calculates the humidity change coefficient, pressure fluctuation coefficient, and evaluation coefficient. ;

[0014] Dynamic adjustment: If : Keep the air pump on standby; if Start the air pump to inflate the seal, increasing the air pressure by 20%. This is a reference threshold.

[0015] Preferably, the logic for generating the humidity variation coefficient is as follows:

[0016] S1. Obtain the actual water vapor concentration inside the chamber at different times within time T using the humidity acquisition module, and calibrate the actual water vapor concentration obtained at time m within time T as follows: , , It is a positive integer;

[0017] S2. Calculate the humidity variation coefficient. The expression for the calculation is:

[0018]

[0019] In the formula, The number of samples taken within time T.

[0020] Preferably, the logic for generating the pressure fluctuation coefficient is as follows:

[0021] S1. Obtain the real-time air pressure of the sealing ring at different times within time T using the pressure acquisition module, and calibrate the real-time air pressure obtained at time n within time T as... , , It is a positive integer;

[0022] S2. Calculate the pressure fluctuation coefficient. The expression for the calculation is:

[0023]

[0024] In the formula, Let be the average air pressure over time T; k is the number of samples taken over time T.

[0025] Preferably, the control module performs formulaic analysis based on the following formula:

[0026]

[0027] In the formula, , The preset weighting coefficients, .

[0028] Compared with the prior art, the present invention provides an intelligent low-voltage cable branch box, which has the following beneficial effects:

[0029] 1. An intelligent low-voltage cable distribution box, by installing an inflatable sealing ring inside the cable hole, and combining it with an actuator consisting of an air pump, a main air pipe, branch air pipes, and solenoid valves, forms a dynamic air replenishment mechanism. When the sealing performance of a certain sealing ring decreases due to insufficient air pressure, the solenoid valve of the corresponding branch air pipe can be opened in time, and the air pump can restore the seal by inflating. This effectively solves the problem of decreased sealing performance caused by aging and other issues in traditional static sealing structures, significantly enhances the stability and reliability of the sealing ring under different environmental conditions, prevents water vapor from entering the box, and reduces the risk of equipment failure.

[0030] 2. An intelligent low-voltage cable branch box, wherein an upper positioning ring and a lower positioning ring are set above and below the cable hole, which can restrict the outward expansion and deformation of the sealing ring when it is inflated, so that the sealing ring can reach the inflation requirement more quickly and quickly wrap the middle cable, which not only improves the inflation efficiency, but also ensures the timeliness and effectiveness of the seal.

[0031] 3. An intelligent low-voltage cable branch box features a notched sponge sleeve inside the central hole of the sealing ring. During installation, the sleeve is first placed on the cable before being inserted into the central hole of the sealing ring. As the sealing ring expands, it compresses the sponge sleeve, allowing it to flexibly adapt to the deformed shape of the inner ring of the sealing ring, thus filling the space between the cable and the sealing ring and effectively improving the seal. Simultaneously, the notch on the sponge sleeve makes it easy to pry open and directly place on the cable, greatly simplifying the installation process.

[0032] 4. An intelligent low-voltage cable branch box is equipped with a humidity acquisition module, a pressure acquisition module, and a control module. It can monitor the water vapor concentration inside the box and the real-time air pressure of the sealing ring in real time, and generate humidity change coefficient, pressure fluctuation coefficient, and evaluation coefficient. By comparing with preset reference thresholds, it can automatically determine whether the actuator needs to inflate the sealing ring. This realizes intelligent monitoring and dynamic adjustment of the sealing status, reduces manual maintenance costs, and improves the intelligence level and reliability of equipment operation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of an intelligent low-voltage cable branch box proposed in this invention;

[0034] Figure 2 This is a schematic diagram of the sealing ring installation structure of an intelligent low-voltage cable branch box proposed in this invention;

[0035] Figure 3 For the present invention Figure 2 A magnified structural diagram at point A;

[0036] Figure 4 This is a cross-sectional view of the sealing ring structure of an intelligent low-voltage cable branch box proposed in this invention;

[0037] Figure 5This is a system block diagram of an intelligent low-voltage cable branch box proposed in this invention.

[0038] In the diagram: 1. Cabinet; 2. Cabinet door; 3. Slide rail; 4. Cable holder; 5. Door lock; 6. Sliding mounting bracket; 7. Cable hole; 8. Sealing ring; 9. Air inlet pipe; 10. Air pump; 11. Main air pipe; 12. Branch air pipe; 13. Solenoid valve; 14. Upper positioning ring; 15. Lower positioning ring; 16. Sponge sleeve; 17. Notch; 18. Humidity acquisition module; 19. Pressure acquisition module; 20. Control module. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "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 invention 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 invention.

[0041] Reference Figures 1-5 A smart low-voltage cable branch box includes a box body 1 and an actuator. The front end of the box body 1 is rotatably connected to a box door 2 with a door lock 5. The inner walls on both sides of the box body 1 are respectively fixedly connected to slide rails 3. Multiple cable fixing brackets 4 are fixedly connected between the two slide rails 3. Multiple cable holes 7 are reserved at the bottom of the box body 1. An inflatable sealing ring 8 with an I-shaped cross section is provided in the cable hole 7 and is fitted on the cable. An air inlet pipe 9 is installed on the top of the sealing ring 8. The actuator includes an air pump 10 fixedly connected to the inner wall at the bottom of the box body 1. The air outlet of the air pump 10 is connected to a main air pipe 11. Multiple branch air pipes 12 on the main air pipe 11 are respectively connected to the corresponding air inlet pipes 9. A valve structure is installed on the branch air pipes 12.

[0042] In use, if the sealing performance of a certain sealing ring 8 is reduced due to insufficient air pressure, simply open the valve structure on the air distribution pipe 12 connected to the sealing ring 8, and then inflate the sealing ring 8 with air pump 10. After inflation is complete, close the valve structure to restore the sealing performance of the sealing ring 8 in time, thereby preventing water vapor from entering the housing 1. This air replenishment mechanism effectively addresses the problem of decreased sealing performance of the sealing ring 8 and significantly enhances the stability and reliability of the sealing ring 8 under different environmental conditions.

[0043] Furthermore, an upper positioning ring 14 and a lower positioning ring 15, which cover the sealing ring 8, are fixedly connected to the upper and lower parts of the cable hole 7, respectively.

[0044] In use, the upper positioning ring 14 and the lower positioning ring 15 can limit the outward expansion and deformation of the sealing ring 8 when it is inflated, so that the sealing ring 8 can reach the inflation requirement more quickly and tightly wrap the cable in the middle.

[0045] Furthermore, a sliding mounting bracket 6 is also provided inside the housing 1, located above the cable fixing bracket 4. Both ends of the sliding mounting bracket 6 are fixed to the slide rail bracket 3 by bolts.

[0046] During use, the fixed height of the sliding mounting bracket 6 can be adjusted according to the on-site installation conditions, thereby ensuring the flexibility and stability of cable and other electrical component installation.

[0047] Furthermore, a sponge sleeve 16 for fitting onto the cable is provided in the central hole of the sealing ring 8, and a notch 17 is reserved on the circumferential surface of the sponge sleeve 16.

[0048] In use, the sponge sleeve 16 can be placed on the cable, and then the sponge sleeve 16 can be placed into the center hole of the sealing ring 8. When the sealing ring 8 expands, it can squeeze the sponge sleeve 16, and the sponge sleeve 16 will flexibly adapt to the shape of the inner ring of the sealing ring 8 after deformation. The sponge sleeve 16 fills the space formed between the cable and the sealing ring 8, thereby effectively improving the sealing performance between the cable and the sealing ring 8. Since there is a notch 17 reserved on the sponge sleeve 16, the sponge sleeve 16 can be pried open from the notch 17 and then directly put on the cable, which is very convenient for installation.

[0049] In another embodiment, an intelligent low-voltage cable branch box further includes:

[0050] The humidity acquisition module 18 is installed in the middle of the bottom inner wall of the box 1. It is used to monitor the water vapor concentration inside the box 1 in real time and generate a humidity change coefficient through the control module 20.

[0051] The pressure acquisition module 19 is embedded in the sealing ring 8 and is used to monitor the real-time air pressure of the sealing ring 8 and generate the pressure fluctuation coefficient through the control module 20.

[0052] It should be noted that the humidity acquisition module 18 can be a humidity sensor or other device that can monitor the water vapor concentration inside the chamber 1 in real time, the pressure acquisition module 19 can be a pressure sensor or other device that can monitor the real-time air pressure of the sealing ring 8, and the control module 20 is an embedded controller (such as the STM32 series) that integrates data fusion algorithms. Therefore, the humidity acquisition module 18, the pressure acquisition module 19, and the control module 20 are not specifically limited here and can be selected according to actual needs.

[0053] Here, the valve structure may be, but is not limited to, a solenoid valve 13. When a certain sealing ring 8 needs to be inflated, the control module 20 will automatically open the solenoid valve 13 that controls the sealing ring 8.

[0054] In use, the control module 20 performs a comprehensive analysis of the generated humidity change coefficient and pressure fluctuation coefficient to generate an evaluation coefficient, determines whether the actuator needs to inflate the sealing ring 8, compares the evaluation coefficient with the preset evaluation coefficient reference threshold, and determines the working status of the actuator based on the comparison result.

[0055] The output and input terminals of the humidity acquisition module 18 and the pressure acquisition module 19 are electrically connected to the input and output terminals of the control module 20, respectively. The output terminal of the control module 20 is electrically connected to the input terminal of the air pump 10 and the input terminal of the solenoid valve 13, respectively.

[0056] In another embodiment, through the cooperation of the humidity acquisition module 18, the pressure acquisition module 19, and the control module 20, the control module 20 comprehensively analyzes the generated humidity change coefficient and pressure fluctuation coefficient to generate an evaluation coefficient, determines whether the actuator needs to inflate the sealing ring 8, compares the evaluation coefficient with a pre-set evaluation coefficient reference threshold, and executes the working status of the actuator based on the comparison result. The specific execution steps are as follows:

[0057] Real-time monitoring: Humidity acquisition module 18 collects the water vapor concentration inside chamber 1; Pressure acquisition module 19 collects the real-time air pressure of sealing ring 8;

[0058] Coefficient calculation:

[0059] Calculate the humidity variation coefficient:

[0060] The humidity change coefficient quantifies the accelerating trend of water vapor intrusion, exponentially amplifying the cumulative effect of humidity changes and highlighting the nonlinear characteristics of the intrusion rate. HΔ≈1 → Humidity rises at a constant rate (∑ΔH≈0) → Effective seal, water vapor slowly penetrates (natural diffusion); HΔ>1 → Humidity rises rapidly (∑ΔH>0) → Seal fails, external water vapor siphons in through gaps (negative pressure effect); HΔ>>1 → Humidity spikes exponentially → Severe leakage (e.g., unsealed cable holes).

[0061] The logic for generating the humidity variation coefficient is as follows:

[0062] S1. Obtain the actual water vapor concentration inside the chamber 1 at different times within time T using the humidity acquisition module 18. Then, calibrate the actual water vapor concentration obtained at time m within time T as follows: , , It is a positive integer;

[0063] S2. Calculate the humidity variation coefficient. The expression for the calculation is:

[0064]

[0065] In the formula, The number of samples taken within time T.

[0066] Pressure fluctuation coefficient:

[0067] Among them, the pressure fluctuation coefficient characterizes the degree of abnormality in the physical state of the sealing ring 8, exponentially amplifies the dispersion of air pressure, and sensitively detects minute leaks. Pσ≈1→stable air pressure (standard deviation σ≈0)→intact sealing ring (uniform distribution of gas molecules); Pσ>1→high-frequency air pressure fluctuation (σ>0)→microscopic leakage (gas escapes through rubber micropores); Pσ>>1→violent air pressure oscillation→macroscopic damage (such as sealing ring tearing, aging cracking).

[0068] The logic for generating the pressure fluctuation coefficient is as follows:

[0069] S1. Obtain the real-time air pressure of the sealing ring 8 at different times within time T through the pressure acquisition module 19, and calibrate the real-time air pressure obtained at the nth time within time T as... , , It is a positive integer;

[0070] S2. Calculate the pressure fluctuation coefficient. The expression for the calculation is:

[0071]

[0072] In the formula, Let be the average air pressure over time T; k is the number of samples taken over time T.

[0073] Evaluation coefficients: A comprehensive risk assessment integrating external intrusion and internal failure is used, employing logarithmic compression of magnitude differences to construct an adversarial equilibrium model.

[0074] Positive term in the numerator ( ): Risk of increased pressure fluctuations;

[0075] Numerator negative term ( ): Increased humidity reduces risk (humidity should be reduced for an ideal seal);

[0076] Among them, the control module 20 performs formulaic analysis based on the following formula:

[0077]

[0078] In the formula, , The preset weighting coefficients, .

[0079] Dynamic adjustment: If Maintain air pump 10 in standby mode; if : Start air pump 10 to inflate and increase the air pressure of sealing ring 8 by 20%. When Pσ>2.5, a directional alarm will sound to indicate that sealing ring 8 is faulty (excluding interference from ambient humidity). This is a reference threshold.

[0080] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An intelligent low-voltage cable branch box, comprising a box body (1) and an actuator, characterized in that, The front end of the box (1) is rotatably connected to a door (2) with a lock (5). Slide rails (3) are fixedly connected to the inner walls of both sides of the box (1). Multiple cable mounting brackets (4) are fixedly connected between the two slide rails (3). Multiple cable holes (7) are pre-drilled at the bottom of the box (1). An inflatable sealing ring (8) with an I-shaped cross-section is installed inside the cable hole (7) and fitted onto the cable. An air inlet pipe (9) is installed on the top of the sealing ring (8). The actuator includes an air pump (10) fixedly connected to the inner wall of the bottom of the box (1). The air outlet of the air pump (10) is connected to a main air pipe (11). Multiple branch pipes (12) on the main air pipe (11) are connected to corresponding air inlet pipes (9). A valve structure is installed on the branch pipe (12). The device also includes: The humidity acquisition module (18) is installed in the middle of the bottom inner wall of the box (1) to monitor the water vapor concentration in the box (1) in real time and generate the humidity change coefficient through the control module (20); The pressure acquisition module (19) is embedded in the sealing ring (8) and is used to monitor the real-time air pressure of the sealing ring (8) and generate the pressure fluctuation coefficient through the control module (20). The valve structure is a solenoid valve (13). The control module (20) performs a comprehensive analysis on the generated humidity change coefficient and pressure fluctuation coefficient to generate an evaluation coefficient. The evaluation coefficient is compared with the preset evaluation coefficient reference threshold, and the working state of the actuator is controlled according to the comparison result.

2. The intelligent low-voltage cable branch box according to claim 1, characterized in that, The upper positioning ring (14) and the lower positioning ring (15) that cover the sealing ring (8) are fixedly connected above and below the cable hole (7).

3. The intelligent low-voltage cable branch box according to claim 1, characterized in that, The housing (1) is also equipped with a sliding mounting bracket (6) located above the cable fixing bracket (4), and the two ends of the sliding mounting bracket (6) are respectively fixed to the slide rail bracket (3) by bolts.

4. The intelligent low-voltage cable branch box according to claim 1, characterized in that, The sealing ring (8) has a sponge sleeve (16) for fitting onto the cable inside its central hole, and a notch (17) is reserved on the circumferential surface of the sponge sleeve (16).

5. The intelligent low-voltage cable branch box according to claim 1, characterized in that, The output and input terminals of the humidity acquisition module (18) and the output and input terminals of the pressure acquisition module (19) are electrically connected to the input and output terminals of the control module (20), respectively. The output terminal of the control module (20) is electrically connected to the input terminal of the air pump (10) and the input terminal of the solenoid valve (13), respectively.

6. The intelligent low-voltage cable branch box according to claim 1, characterized in that, The control module (20) executes the following steps to control the working state of the actuator based on the comparison results: The humidity acquisition module (18) acquires the water vapor concentration inside the enclosure (1), the pressure acquisition module (19) acquires the real-time air pressure of the sealing ring (8), and the control module (20) calculates the humidity change coefficient, pressure fluctuation coefficient, and evaluation coefficient. and with reference threshold Perform a comparison, if : Maintain air pump (10) in standby mode; if Start the air pump (10) to inflate.

7. The intelligent low-voltage cable branch box according to claim 1, characterized in that, The logic for generating the humidity change coefficient is as follows: S1. Obtain the actual water vapor concentration inside the box (1) at different times within time T using the humidity acquisition module (18), and calibrate the actual water vapor concentration obtained at time m within time T as... , , It is a positive integer; S2. Calculate the humidity variation coefficient. The expression for the calculation is: In the formula, The number of samples taken within time T.

8. The intelligent low-voltage cable branch box according to claim 7, characterized in that, The logic for generating the pressure fluctuation coefficient is as follows: S1. Obtain the real-time air pressure of the sealing ring (8) at different times within time T through the pressure acquisition module (19), and calibrate the real-time air pressure obtained at the nth time within time T as... , , It is a positive integer; S2. Calculate the pressure fluctuation coefficient. The expression for the calculation is: In the formula, Let be the average air pressure over time T; k is the number of samples taken over time T.

9. The intelligent low-voltage cable branch box according to claim 8, characterized in that, The control module (20) performs a formulaic analysis based on the following formula: In the formula, , The preset weighting coefficients, .

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