Intelligent low-voltage cable branch box

Abstract

The invention provides an intelligent low-voltage cable branch box, and belongs to the technical field of cable branch boxes. The self-adaptive air supply box comprises a box body, a drying sealing assembly, a self-adaptive air supply assembly and a dehumidification assembly, through pushing of the U-shaped clamping jaw and inflation of the annular air bag, tight sealing between the cable and the branch box is achieved, meanwhile, the problem of sealing performance reduction caused by external temperature or humidity changes can be automatically sensed and dealt with, gas is pushed into the movable cavity and the annular air bag through automatic upward movement of the piston, automatic gas supplementing is achieved, and the service life of the cable is prolonged. The reliability of the sealing device is enhanced; the moisture change on the surface of the cable can be automatically sensed, the moisture is effectively collected and discharged through the cooperative action of suction and exhaust of the piston, meanwhile, the drying part is heated through the electric heating block, comprehensive dehumidification treatment is achieved, a drying agent does not need to be frequently replaced, and the maintenance cost is reduced; through double guarantee of efficient sealing and intelligent dehumidification, the electrical fault risk of the cable is reduced, and the service life of the cable and the branch box is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of cable branch boxes, and in particular to an intelligent low-voltage cable branch box. Background Art

[0002] The cable branch box is used as a cable branch. The main function of the cable branch box is to branch or transfer the cables. It mainly plays the role of cable branching and cable transfer. With the rapid development of the modernization of the electric power industry, the transformation of the power grid has been launched in all directions. When the underground main line cable needs to realize multi-circuit distribution at a certain distance, the use of cable branch boxes as an important supporting equipment for power distribution is an economical, convenient and safe method. Compared with traditional distribution boxes, cable branch boxes greatly save land, are easy to install, easy to maintain and expand, do not require ground infrastructure, greatly reduce infrastructure investment, reduce resource waste, save project costs, and beautify the railway environment.

[0003] Cables usually enter the branch box through the cable hole. Since the cable hole and the reserved hole are usually located at the bottom of the branch box, water vapor enters the box from bottom to top, becoming the main invasion route for humid air. This invasion is more serious, especially in low-lying areas or areas with high groundwater levels. The existing technology usually seals the cable hole with a seal. When the external humidity is high and the temperature is low, the performance of the seal will decrease. When the cable hole is not sealed tightly, external humid air can easily enter the branch box. In the case of large temperature differences, condensation is very easy to form, which not only reduces the insulation performance of the equipment, but also may cause short circuits and other electrical faults. Secondly, if the cable hole of the box is dried with a desiccant, although it is simple and easy, it needs to be replaced frequently, especially in an environment with high humidity, which increases the cost and time of manual maintenance.

[0004] How to invent an intelligent low-voltage cable branch box to solve these problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides an intelligent low-voltage cable branch box, aiming to solve the problems mentioned in the above background.

[0006] The present invention is achieved in that: The present invention provides an intelligent low-voltage cable branch box, comprising a box body, a mounting plate installed inside the box body, a plurality of bushings installed on the mounting plate, a T-shaped plug installed on the end of the bushing, a stress cone and a cable crimping terminal arranged inside the T-shaped plug, a lightning arrester installed on the rear side of the T-shaped plug, a rubber cap sleeved on the end of the lightning arrester, a bottom plate installed at the bottom of the box body, a wire outlet hole, a wire inlet hole and a cable fixing frame arranged on the bottom plate, a clamp for fixing the cable installed on the cable fixing frame, a conical connecting cylinder installed on the bottom plate corresponding to the wire outlet hole and the wire inlet hole, and further comprising: Drying seal assembly: The drying seal assembly is arranged inside the conical connecting tube, and is used to maintain the seal between the cable and the outlet hole and the inlet hole, and at the same time dry the external humid air at the bottom of the bottom plate; Adaptive air supply component: The adaptive air supply component is arranged inside the dry sealing component, and the adaptive air supply component can enhance the sealing effect of the dry sealing component when the external temperature is low; Dehumidification component: The dehumidification component is arranged on the dry sealing component, and the dehumidification component dehumidifies the dry sealing component according to the state of the adaptive air replenishment component.

[0007] Preferably, the drying seal assembly includes a wire tube, a connecting rod, an annular airbag, and a U-shaped clamp. The wire tube is clamped and installed on the conical connecting tube, the annular airbag is fixedly installed on the inner side of the wire tube, a plurality of movable cavities are arranged inside the wire tube, a connecting spring is installed inside the movable cavity, the lower end of the connecting spring is fixedly connected to the top of the connecting rod, the U-shaped clamp is fixedly connected to the bottom end of the connecting rod, and a drying part is arranged on the inner upper end of the U-shaped clamp.

[0008] Preferably, a second channel is provided between the bottom wall of the annular airbag and the active cavity, the number of the U-shaped claws in a single wire tube is two and they are symmetrically arranged on the left and right along the central axis of the wire tube, and the active cavity and the connecting rod are equidistantly distributed in a ring shape along the central axis of the wire tube.

[0009] Preferably, the drying part is evenly distributed along the inner edge of the U-shaped clamping jaw, the drying part is a raised arc-shaped piece and is elastic, the drying part is pressed from a polymer membrane material, and the annular airbag is made of TPU material.

[0010] Preferably, when the connecting spring is in an initial state, the upper end of the connecting rod is located inside the active cavity, and the connecting rod is slidably and sealingly connected to the active cavity.

[0011] Preferably, the adaptive air replenishing component includes an air guide cavity arranged in the connecting rod, the upper end of the air guide cavity is penetrated through the top wall thereof to provide a first channel, the lower end of the air guide cavity is penetrated through the lower side wall of the connecting rod, a piston is slidably arranged in the air guide cavity, and a magnetic cylinder is fixedly installed in the lower port of the air guide cavity.

[0012] Preferably, a magnetic block is provided at the lower end of the piston, and the opposing surfaces of the magnetic block and the magnetic cylinder are magnetically arranged with the same polarity. The piston is slidingly and sealingly connected to the air guide cavity. The piston is located in the middle of the air guide cavity at normal temperature, and the lower end of the magnetic block matches the inner cavity of the magnetic cylinder.

[0013] Preferably, the adaptive air replenishment component also includes a condensation chamber and a drainage channel arranged in the U-shaped clamp, and the ends of the drainage channel respectively penetrate the bottom wall of the condensation chamber and the outer wall of the U-shaped clamp, and the drainage channel is arranged with a large upper port and a small lower port, and the air guide chamber located on the lower side of the piston is connected to the condensation chamber.

[0014] Preferably, the dehumidification component includes a mounting groove, a conductive column and a conductive tube. The mounting groove is located at the upper end of the wire tube and an electric heating block is installed inside it. The electric heating block is annular and is arranged around the annular airbag. The conductive column is located at the upper end of the piston, and the conductive tube is located at the lower end of the first channel.

[0015] Preferably, the input end of the electric heating block is electrically connected to an external power supply, the wire tube is made of a high thermal conductivity material, an inner groove matching the first channel is provided through the inside of the conductive tube, the conductive tube, the conductive column and the electric heating block are electrically connected, and the end of the conductive column matches the inner groove of the conductive tube.

[0016] The beneficial effects of the present invention are: When the cable passes through the branch box, the U-shaped clamp is pushed to compress the gas in the active cavity, automatically inflating the annular airbag so that it fits tightly to the cable surface, forming an effective sealing barrier to isolate external humid air and dust; when the external humidity increases or the temperature changes, causing the sealing performance to decrease, the gas is automatically pushed into the active cavity and the annular airbag through the upward movement of the piston, achieving automatic air replenishment and maintaining a tightly sealed state. This automatic air replenishment mechanism effectively addresses the problem of reduced sealing performance due to changes in external temperature or humidity, and significantly enhances the stability and reliability of the sealing device under different environmental conditions.

[0017] When the external humidity increases, the moisture on the cable surface is first adsorbed by the drying part. As the moisture accumulates, the change in gas pressure in the condensate chamber triggers the upward movement of the piston, forming a negative pressure. This not only achieves the initial drying of the drying part, but also effectively collects the moisture in the condensate chamber, and at the same time reflects the external moisture changes to the inside of the air guide chamber and the active chamber, so that the entire system can sense and respond to humidity changes in a timely manner; the piston continues to move upward to trigger the electric heating block to heat the gas in the chamber, and the gas expansion pushes the piston downward to discharge the moisture and further dry the drying part, realizing comprehensive dehumidification processing; through the coordinated action of the piston's suction and exhaust, not only the degree of automation of the dehumidification component is enhanced, but also the drying efficiency of the drying part is improved, and there is no need to replace the desiccant, which provides a strong guarantee for the long-term stable operation of the cable.

[0018] Through the dual protection of efficient sealing and intelligent dehumidification, the risk of electrical failures such as insulation degradation and short circuit caused by humid environment is effectively reduced, providing strong support for the long-term stable operation of cables and extending the service life of cables and branch boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of an intelligent low-voltage cable branch box provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the bottom structure of an intelligent low-voltage cable branch box provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the internal structure of an intelligent low-voltage cable branch box provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of a conical connecting tube and a conductor tube of an intelligent low-voltage cable branch box provided by an embodiment of the present invention; Figure 5 It is a right-view cross-sectional structural schematic diagram of an intelligent low-voltage cable branch box provided in an embodiment of the present invention; Figure 6 This is an intelligent low-voltage cable branch box provided by the embodiment of the present invention. Figure 5 The enlarged structural diagram at A in the middle; Figure 7 It is a schematic diagram of a right-side cross-sectional front view structure of an intelligent low-voltage cable branch box provided in an embodiment of the present invention; Figure 8This is an intelligent low-voltage cable branch box provided by the embodiment of the present invention. Figure 7 The enlarged structural diagram at B in the middle; Fig. 9 It is a schematic diagram of a partial explosion structure of an intelligent low-voltage cable branch box provided by an embodiment of the present invention; Fig.10 It is a schematic diagram of the structure of an installation slot and a drainage channel of an intelligent low-voltage cable branch box provided by an embodiment of the present invention; Fig.11 It is a schematic diagram of the gas flow structure of an intelligent low-voltage cable branch box provided by an embodiment of the present invention when the external temperature is low; Fig.12 It is a schematic diagram of the gas flow structure after the electric heating block of an intelligent low-voltage cable branch box is working, provided by an embodiment of the present invention.

[0021] In the figure: 1. box body; 2. bottom plate; 3. cable fixing frame; 4. conical connecting cylinder; 5. wire cylinder; 6. piston; 7. connecting rod; 8. annular air bag; 9. U-shaped clamp; 11. mounting plate; 12. sleeve; 13. T-shaped plug; 14. lightning arrester; 15. rubber cap; 51. mounting groove; 52. electric heating block; 53. movable cavity; 54. connecting spring; 61. conductive column; 62. magnetic block; 71. air guide cavity; 72. magnetic cylinder; 73. conductive cylinder; 74. first channel; 81. second channel; 91. condensate cavity; 92. drainage channel; 93. drying section. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1, refer to Figure 1-Figure 6, an intelligent low-voltage cable branch box, including a box body 1, a mounting plate 11 is installed inside the box body 1, a plurality of bushings 12 are installed on the mounting plate 11, a T-shaped plug 13 is installed at the end of the bushing 12, a stress cone and a cable crimping terminal are arranged inside the T-shaped plug 13 for electrical connection with the cable, a lightning arrester 14 is installed on the rear side of the T-shaped plug 13 for protecting the cable branch box and the electrical equipment connected thereto from damage caused by lightning overvoltage, a rubber cap 15 is sleeved on the end of the lightning arrester 14 for insulation and protection, a bottom plate 2 is installed at the bottom of the box body 1, a wire outlet hole, a wire inlet hole and a cable fixing frame 3 are arranged on the bottom plate 2, a clamp for fixing the cable is installed on the cable fixing frame 3, a conical connecting cylinder 4 is installed on the bottom plate 2 corresponding to the wire outlet hole and the wire inlet hole, forming a transition connection with the cable, which helps to maintain the sealing and stability of the cable, and also includes: Drying seal assembly: The drying seal assembly is arranged inside the conical connecting tube 4, and is used to maintain the seal between the cable and the outlet hole and the inlet hole, and at the same time dry the external humid air at the bottom of the bottom plate 2; Adaptive air supply component: The adaptive air supply component is arranged inside the dry sealing component. The adaptive air supply component can enhance the sealing effect of the dry sealing component when the external temperature is low; Dehumidification component: The dehumidification component is arranged on the dry sealing component, and the dehumidification component dehumidifies the dry sealing component according to the state of the adaptive air supply component.

[0024] Furthermore, the dry sealing assembly includes a wire barrel 5, a connecting rod 7, an annular airbag 8, and a U-shaped clamp 9. The wire barrel 5 is clamped and installed on the conical connecting barrel 4. The annular airbag 8 is fixedly installed on the inner side of the wire barrel 5. A plurality of movable cavities 53 are arranged inside the wire barrel 5. A connecting spring 54 is installed inside the movable cavity 53. The lower end of the connecting spring 54 is fixedly connected to the top of the connecting rod 7. The U-shaped clamp 9 is fixedly connected to the bottom end of the connecting rod 7. When the cable is installed, its end passes through the conical connecting barrel 4, the U-shaped clamp 9, the wire barrel 5 and the annular airbag 8 in turn, and finally extends into the interior of the box body 1. A drying portion 93 is arranged on the inner upper end of the U-shaped clamp 9. The drying portion 93 is elastic and hygroscopic, can fit closely to the surface of the cable and absorb moisture at the outlet and inlet holes.

[0025] A second channel 81 is provided between the bottom wall of the annular airbag 8 and the active cavity 53. When the cable passes through the U-shaped clamping jaws 9 and drives the connecting rod 7 to move upward, the gas in the active cavity 53 will be compressed and enter the annular airbag 8 through the second channel 81, causing it to swell and fit tightly to the cable surface. This automatic inflation mechanism ensures that the annular airbag 8 can quickly and effectively form a seal during the cable installation process. There are two U-shaped clamping jaws 9 in a single wire barrel 5 and they are symmetrically arranged on the left and right along the central axis of the wire barrel 5. This layout helps to balance the stress on the cable when it passes through, and prevents the cable from deviating to one side and causing poor sealing or damage. The active cavity 53 and the connecting rod 7 are equidistantly distributed in a ring shape along the central axis of the wire barrel 5, ensuring that the annular airbag 8 can swell evenly.

[0026] It should be noted that the drying portion 93 is equidistantly distributed along the inner edge of the U-shaped clamp 9. The drying portion 93 is a raised arc-shaped piece and is elastic, so that it can better fit the cable surface. Even if there are slight unevenness on the cable surface, it can still be in close contact, thereby improving the drying effect. The drying portion 93 is pressed from a polymer membrane material, which not only has excellent moisture absorption properties, but also has good elasticity and wear resistance. The elastic design enables the drying portion 93 to adapt to cables of different diameters and shapes to ensure long-term and stable drying effects. The annular airbag 8 is made of TPU material, which has excellent elasticity and wear resistance and can fit closely to the cable surface after inflation to form an effective sealing barrier. At the same time, the TPU material also has good aging resistance and tear resistance, ensuring the long-term service life of the annular airbag 8. The upper end of the connecting rod 7 when the connecting spring 54 is in the initial state is located inside the active cavity 53, which prevents the connecting rod 7 from being separated from the active cavity 53. The connecting rod 7 and the active cavity 53 are slidingly sealed to ensure that the connecting rod 7 will not leak during movement.

[0027] In this embodiment, the cable first passes through the conical connecting tube 4, which forms a transition connection with the cable, which helps to maintain the sealing and stability of the cable. Then, the cable enters the U-shaped clamp 9. Since the inner upper end of the U-shaped clamp 9 is provided with a drying portion 93, these raised arc-shaped pieces will immediately contact the surface of the cable. When the cable continues to move forward, it will push the U-shaped clamp 9 to move upward. Since the U-shaped clamp 9 is fixedly connected to the bottom end of the connecting rod 7, the connecting rod 7 will also move upward. Since the top of the connecting rod 7 is connected to the active chamber 53 through the connecting spring 54, as the connecting rod 7 moves upward, the gas in the active chamber 53 will be gradually compressed.

[0028] It should be noted that when the cable moves forward and contacts the U-shaped clamp 9, the diameter of the cable will prevent it from passing further without hindrance. At this time, the propulsion force of the cable will act on the U-shaped clamp 9 through the drying part 93, pushing it to move upward along the designed path (i.e., the direction of the connecting rod 7).

[0029] Gas flow and inflation of the annular airbag 8: The compressed gas flows into the annular airbag 8 through the second channel 81 that is set through. As the gas is continuously filled, the annular airbag 8 will gradually swell and fit tightly on the surface of the cable. This automatic inflation mechanism ensures that the annular airbag 8 can quickly and effectively form a seal to prevent external humid air and dust from entering the interior of the box 1.

[0030] Function of the drying portion 93: During the process of the cable passing through the U-shaped clamp 9, the drying portion 93 will continue to contact with the surface of the cable and absorb moisture. Since the drying portion 93 is made of a polymer permeable membrane material with excellent moisture absorption and elasticity, it can fit closely to the surface of the cable and effectively remove moisture. Even if there are slight unevenness on the surface of the cable, the elastic design of the drying portion 93 can ensure that it maintains good contact with the surface of the cable, thereby improving the drying effect.

[0031] Sealing and stable maintenance: Once the annular airbag 8 is fully inflated and fits tightly against the cable surface, the entire dry sealing assembly forms a complete sealing system, which can not only effectively prevent the intrusion of external humid air and dust, but also keep the environment around the cable dry through the continuous action of the drying part 93.

[0032] At the same time, the number and layout of the U-shaped clamping claws 9 (two and symmetrically arranged on the left and right along the central axis of the wire barrel 5) and the annular equidistant distribution design of the movable cavity 53 and the connecting rod 7 help to balance the force of the cable when passing through, preventing the cable from deviating to one side and causing poor sealing or damage.

[0033] In summary, the drying and sealing component of the intelligent low-voltage cable branch box realizes the automatic sealing and drying function of the cable when passing through the box body 1; the U-shaped clamp 9 is pushed by the cable to compress the gas in the active chamber 53, and the annular airbag 8 is automatically inflated and tightly fitted to the cable surface, forming an effective sealing barrier, effectively preventing the invasion of external humid air and dust, and ensuring the drying and cleanliness of the cable; the drying part 93 built into the U-shaped clamp 9 adopts a polymer permeable membrane material, which can closely fit the cable surface and efficiently absorb moisture, and can maintain a good contact effect even when there are slight unevenness on the cable surface, significantly improving the drying effect of the cable and extending the service life of the cable; and the entire drying and sealing process does not require manual intervention, and the automatic inflation and sealing of the annular airbag 8 can be completed by the propulsion force of the cable itself, which greatly simplifies the operation process and improves work efficiency; at the same time, the design is suitable for cables of different diameters. Through the elastic design of the drying part 93 and the adaptability of the annular airbag 8, it can closely fit and effectively seal cables of various specifications, and has broad application prospects. This design not only improves the safety and reliability of cable connection, but also extends the service life of the cable and its connected equipment.

[0034] Example 2, refer to Figure 5-Figure 8 The adaptive air replenishment component includes an air guide cavity 71 arranged in the connecting rod 7, the upper end of the air guide cavity 71 is provided with a first channel 74 penetrating through its top wall, the air guide cavity 71 is connected with the active cavity 53 through the first channel 74, the lower end of the air guide cavity 71 penetrates the lower side wall of the connecting rod 7, a piston 6 is slidably arranged in the air guide cavity 71, and a magnetic cylinder 72 is fixedly installed in the lower end of the air guide cavity 71.

[0035] Furthermore, a magnetic block 62 is provided at the lower end of the piston 6, and the opposing surfaces of the magnetic block 62 and the magnetic cylinder 72 are magnetically arranged with the same polarity. The piston 6 and the air guide cavity 71 are slidingly and sealedly connected. The piston 6 at room temperature is located in the middle of the air guide cavity 71. Under normal conditions (i.e., when there is no external force), the piston 6 will be subject to the repulsive force of the magnetic cylinder 72 and remain in the middle position of the air guide cavity 71. This design not only ensures the sealing performance, but also enables the piston 6 to move flexibly when subjected to external force. The lower end of the magnetic block 62 matches the inner cavity of the magnetic cylinder 72.

[0036] It should be noted that the adaptive air replenishment component also includes a condensation chamber 91 and a drainage channel 92 arranged in the U-shaped clamp 9. The ends of the drainage channel 92 respectively penetrate the bottom wall of the condensation chamber 91 and the outer wall of the U-shaped clamp 9. The drainage channel 92 is arranged with a large upper port and a small lower port, which ensures that water vapor is easy to discharge but difficult to enter. The air guide chamber 71 located at the lower side of the piston 6 is connected with the condensation chamber 91. The moisture absorbed by the drying part 93 will gradually accumulate and eventually enter the condensation chamber 91. The water vapor entering the condensation chamber 91 will be in the condensation chamber 91. The water vapor condenses into water droplets inside the air guide cavity 71 and is discharged through the drainage channel 92. At the same time, the entry of this water vapor will cause the gas temperature in the air guide cavity 71 to decrease (indicating that the external environment is also relatively humid, such as the rainy season). This temperature change will be transmitted to the air guide cavity 71 and the active cavity 53, causing the gas inside them to shrink accordingly. Under the push of the magnetic force, the piston 6 moves upward accordingly, and then the gas in the air guide cavity 71 above the piston 6 can be pushed into the active cavity 53 and the annular airbag 8, thereby realizing automatic air replenishment of the annular airbag 8 to maintain the seal between it and the cable.

[0037] In this embodiment, the stable state under normal conditions: under normal conditions, that is, when there is no external force, the magnetic block 62 on the piston 6 is repelled by the magnetic force of the same polarity in the magnetic cylinder 72, so that the piston 6 remains in the middle position of the air guide cavity 71. This design not only ensures the sealing of the air guide cavity 71 and prevents gas leakage, but also allows the piston 6 to move flexibly when needed.

[0038] Moisture absorption and condensation formation: When the cable passes through the U-shaped clamp 9, the moisture on its surface is absorbed by the drying portion 93. As time goes by, the moisture gradually accumulates and turns into water vapor, which enters the condensation chamber 91 connected to the air guide chamber 71. In the condensation chamber 91, the water vapor is easy to condense into water droplets for the following reasons: Surface area effect: The inner wall of the condensation chamber 91 provides a surface area for water vapor condensation. When water vapor molecules contact the inner wall of the condensation chamber 91, due to the adsorption of the wall material, the water vapor molecules will form a thin water film on the wall or condense into water droplets.

[0039] Humidity change: As water vapor continues to enter the condensation chamber 91, the humidity in the chamber gradually increases. When the humidity reaches a certain level, the frequency of collisions between water vapor molecules increases, which is conducive to the formation of larger water molecule clusters, which then condense into water droplets.

[0040] Slowed air flow: In the condensation chamber 91, the air flow is relatively slow, which reduces the possibility of water vapor molecules being carried away. This slowed air flow helps the water vapor stay in the condensation chamber 91 for a longer time, increasing the chance of water vapor condensation.

[0041] Temperature change and air pressure adjustment: The process of water vapor entering the condensation chamber 91 and condensing into water droplets will release latent heat, but will cause the gas temperature in the air guide chamber 71 to decrease overall (this temperature change reflects the humidity conditions of the external environment, especially when the external environment is also relatively humid, such as the rainy season). This temperature change will be further transmitted to the active chamber 53 connected to the air guide chamber 71, causing the gas inside it to shrink accordingly due to the principle of thermal expansion and contraction.

[0042] Automatic air replenishment mechanism: As the gas pressure in the active chamber 53 decreases and the magnetic cylinder 72 continues to repel the piston 6, the piston 6 will begin to move upward. The upward movement of the piston 6 will compress the gas in the upper part of the air guide chamber 71, and push this part of the gas into the active chamber 53 through the first channel 74, and then enter the annular airbag 8 through the second channel 81. This process realizes the automatic air replenishment of the annular airbag 8, ensuring that it maintains a tight sealing state with the cable. This sealing state effectively prevents the intrusion of external humid air, dust and other impurities, and protects the cable and its surrounding environment from being dry and clean.

[0043] Condensate discharge: The water droplets accumulated in the condensate chamber 91 are discharged to the outside of the U-shaped clamp 9 through the drainage channel 92, preventing the accumulation of condensate from causing damage to the cable or sealing components.

[0044] In summary, the adaptive air replenishment component in this embodiment effectively overcomes the shortcomings of the existing sealing device that may have poor sealing performance when the temperature changes. When the humidity of the external environment increases, causing the water vapor in the condensation chamber 91 to condense and causing the gas temperature in the air guide chamber 71 to decrease, the adaptive air replenishment can automatically sense and respond to this change, and push the gas into the active chamber 53 and the annular airbag 8 by the upward movement of the piston 6 to achieve automatic air replenishment, thereby maintaining a tight sealing state between the annular airbag 8 and the cable; the automatic air replenishment mechanism effectively copes with the problem of reduced sealing performance due to changes in external temperature or humidity, and significantly enhances the stability and reliability of the sealing device under different environmental conditions. This stability is not only reflected in the long-term maintenance of sealing performance, but also in the effective isolation of external humid air, dust and other impurities, providing a strong guarantee for the drying and cleaning of the cable and its surrounding environment; by reducing external erosion and internal corrosion caused by poor sealing, the adaptive air replenishment component helps to extend the service life of the cable and the sealing device. At the same time, its design takes into account the thermal expansion and contraction characteristics of the material, avoiding the problem of damage or failure of the seal caused by temperature changes.

[0045] Example 3, refer to Figure 5-Figure 12 The dehumidification component includes a mounting groove 51, a conductive column 61 and a conductive tube 73. The mounting groove 51 is located at the upper end of the wire tube 5 and an electric heating block 52 is installed inside it. The electric heating block 52 is annular and is arranged around the annular airbag 8 to ensure that heat can be transmitted to the inside of the annular airbag 8. The conductive column 61 is located at the upper end of the piston 6, and the conductive tube 73 is located at the lower end of the first channel 74. When the piston 6 moves up, the conductive column 61 will contact the conductive tube 73.

[0046] Furthermore, the input end of the electric heating block 52 is electrically connected to an external power source for supplying power thereto. The wire tube 5 is made of a high thermal conductivity material to ensure that the heat generated by the electric heating block 52 when it is working can be effectively transferred. The inside of the conductive tube 73 is provided with an inner groove matching the first channel 74 to ensure that the gas can flow normally. The conductive tube 73, the conductive column 61 and the electric heating block 52 are electrically connected. The end of the conductive column 61 matches the inner groove of the conductive tube 73. When the conductive tube 73 contacts the conductive column 61 (indicating that the external humidity is high at this time and the piston 6 moves upward a long distance), the electric heating block 52 starts to work, and the heat generated by it is transferred to the gas guide cavity 71, the active cavity 53 and the annular airbag 8 through the wire tube 5. At this time, the gas in the cavity expands when heated, and the expanded gas pushes the piston 6 downward. During the downward movement of the piston 6, an exhaust (hot gas) action is triggered in the gas guide cavity 71 (refer to Fig.12 ), this exhaust action helps to discharge the accumulated liquid in the condensation chamber 91 on the one hand, and on the other hand, it can also perform additional drying treatment on the drying part 93. When the conductive column 61 is no longer in contact with the conductive tube 73, the electric heating block 52 stops working.

[0047] It should be noted that when the external humidity is high, referring to the second embodiment, the piston 6 will move upward. During this process, the upward movement of the piston 6 will perform a suction action in the condensate chamber 91 (refer to Fig.11 ), which on the one hand will cause the water vapor on the drying portion 93 to be adsorbed into the condensation chamber 91 (realizing automatic drying of the drying portion 93), and at the same time helps to promptly respond to the changes in external humidity to the inside of the air guide chamber 71 and the active chamber 53.

[0048] In this embodiment, humidity sensing and piston 6 movement: when the external humidity is high, according to the previous mechanism (as described in the second embodiment), moisture is absorbed by the drying portion 93 on the cable surface and gradually converted into water vapor, and enters the condensation chamber 91. As the water vapor accumulates, the humidity in the condensation chamber 91 increases, causing the piston 6 to move upward due to the change in gas pressure. During the upward movement of the piston 6, its suction action forms a certain negative pressure in the condensation chamber 91. This negative pressure promotes the water vapor adsorbed on the drying portion 93 to be further sucked into the condensation chamber 91. In this way, not only the automatic drying of the drying portion 93 is achieved, and the direct impact of water vapor on the cable is reduced, but also the moisture is effectively collected in the condensation chamber 91, providing conditions for subsequent dehumidification treatment, and at the same time reflecting the external moisture changes to the air guide chamber 71 and the active chamber 53, so that the entire system can timely sense and respond to the change in humidity, so as to take corresponding dehumidification measures. This intelligent sensing and automatic response mechanism ensures that the dryness and sealing of the cable and its surrounding environment are effectively guaranteed.

[0049] Electrical contact triggered heating: As the piston 6 continues to move upward, the conductive column 61 at its upper end eventually contacts the conductive tube 73 at the lower end of the first channel 74. This contact behavior serves as an electrical signal, triggering the start-up of the electric heating block 52. The electric heating block 52 is powered by an external power supply, and because it is arranged around the annular airbag 8, the heat generated by it is quickly transferred to the air guide cavity 71, the active cavity 53 and the inside of the annular airbag 8 through the highly thermally conductive wire tube 5.

[0050] Thermal expansion and exhaust: The gas in the chamber expands after being heated, and the pressure generated by this expansion pushes the piston 6 to move downward. During the downward movement of the piston 6, it triggers an exhaust (hot air) action in the air guide chamber 71. This exhaust action not only helps to discharge the liquid (including water droplets condensed from water vapor) accumulated in the condensation chamber 91, reducing the damage of the accumulated liquid to the cable or sealing components, but the hot air also performs additional drying treatment on the drying section 93, further improving the dehumidification effect.

[0051] Heating stop and recovery: When the conductive column 61 is no longer in contact with the conductive cylinder 73 (i.e. the piston 6 is gradually pushed to the bottom of the air guide cavity 71 by air pressure), the electric heating block 52 automatically stops working and the system returns to normal. At this time, the gas temperature in the annular airbag 8, the air guide cavity 71 and the active cavity 53 gradually decreases, but due to the previous heating and exhaust process, the humidity level of the entire system has been significantly reduced, and the dryness and sealing of the cable and its surrounding environment are effectively guaranteed.

[0052] It should be noted that: through the coordinated action of suction and exhaust of the piston 6, a comprehensive and efficient automatic drying process of the drying section 93 is realized, thereby ensuring that it can continuously and effectively remove moisture from the cable surface; specifically, when the external humidity increases, the moisture on the cable surface is first adsorbed by the drying section 93. As the moisture accumulates, the gas pressure in the condensation chamber 91 changes, triggering the piston 6 to start moving upward. During the rising process, the suction action of the piston 6 forms a negative pressure in the condensation chamber 91. This negative pressure effectively further draws the moisture adsorbed on the drying section 93 into the condensation chamber 91, thereby achieving preliminary drying of the drying section 93.

[0053] Subsequently, when the piston 6 continues to move upward and contacts the conductive tube 73, the electric heating block 52 is activated to heat the gas in the chamber. The heated gas expands and pushes the piston 6 to move downward. In this process, the exhaust action of the piston 6 discharges the hot gas into the gas guide chamber 71, and flows to the drying section 93 through the condensation chamber 91 for further drying. In this way, the drying section 93 realizes comprehensive and efficient automatic drying under the dual effects of suction and exhaust, ensuring that it can continuously and effectively remove moisture from the cable surface; therefore, the coordinated action of suction and exhaust of the piston 6 not only enhances the automation degree of the dehumidification system, but also improves the drying efficiency and effect of the drying section 93, providing a strong guarantee for the long-term stable operation of the cable.

[0054] In summary, the dehumidification component realizes intelligent dehumidification and dynamic adjustment of the cable environment through humidity sensing, electrical contact triggered heating, thermal expansion exhaust and automatic heating stop, thereby ensuring the long-term stable operation of the cable; through the humidity sensing mechanism, the component can automatically detect changes in external humidity and adjust the dehumidification strategy accordingly. When the external humidity increases, the component can respond quickly and automatically start the dehumidification process without manual intervention, thereby improving the timeliness and efficiency of dehumidification; the heat generated by the electric heating block 52 is used to heat the gas in the chamber, causing the gas to expand and push the piston 6 to move, thereby realizing the dehumidification of the accumulated gas in the condensate chamber 91. The condensed liquid is effectively discharged, and at the same time, the hot air also performs additional drying treatment on the drying part 93, which further improves the dehumidification effect and ensures the low humidity state of the cable and its surrounding environment; through timely and effective dehumidification and drying treatment, the component can significantly reduce the humidity level around the cable, reduce the erosion and damage of the cable by water vapor, thereby extending the service life of the cable and improving the stability and reliability of the power system; the intelligent sensing and automatic dehumidification functions of the component enable it to adapt to the needs of different humidity environments, and can keep the cable dry regardless of high or low humidity environments, thereby improving the environmental adaptability and operating efficiency of the equipment.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent low-voltage cable branch box, comprising a box body (1), a mounting plate (11) is installed inside the box body (1), a plurality of bushings (12) are installed on the mounting plate (11), a T-shaped plug (13) is installed at the end of the bushing (12), a stress cone and a cable crimping terminal are arranged inside the T-shaped plug (13), a lightning arrester (14) is installed on the rear side of the T-shaped plug (13), a rubber cap (15) is sleeved on the end of the lightning arrester (14), a bottom plate (2) is installed at the bottom of the box body (1), a wire outlet hole, a wire inlet hole and a cable fixing frame (3) are arranged on the bottom plate (2), a clamp for fixing the cable is installed on the cable fixing frame (3), a conical connecting cylinder (4) is installed on the bottom plate (2) corresponding to the wire outlet hole and the wire inlet hole, characterized in that: Also includes: Drying seal component: the drying seal component is arranged inside the conical connecting cylinder (4), and is used to maintain the seal between the cable and the outlet hole and the inlet hole, and at the same time to dry the external humid air at the bottom of the bottom plate (2); Adaptive air supply component: The adaptive air supply component is arranged inside the dry sealing component, and the adaptive air supply component can enhance the sealing effect of the dry sealing component when the external temperature is low; Dehumidification component: The dehumidification component is arranged on the dry sealing component, and the dehumidification component dehumidifies the dry sealing component according to the state of the adaptive air replenishment component.

2. The intelligent low-voltage cable branch box according to claim 1, characterized in that: The drying seal assembly comprises a wire barrel (5), a connecting rod (7), an annular airbag (8), and a U-shaped clamp (9); the wire barrel (5) is mounted on the conical connecting barrel (4) by clamping; the annular airbag (8) is fixedly mounted on the inner side of the wire barrel (5); a plurality of movable cavities (53) are arranged inside the wire barrel (5); a connecting spring (54) is installed inside the movable cavity (53); the lower end of the connecting spring (54) is fixedly connected to the top of the connecting rod (7); the U-shaped clamp (9) is fixedly connected to the bottom end of the connecting rod (7); and a drying portion (93) is arranged at the inner upper end of the U-shaped clamp (9).

3. The intelligent low-voltage cable branch box according to claim 2 is characterized in that: A second passage (81) is provided between the bottom wall of the annular airbag (8) and the active cavity (53); the number of the U-shaped clamping claws (9) in a single wire barrel (5) is two and they are symmetrically arranged along the central axis of the wire barrel (5) in the left and right directions; the active cavity (53) and the connecting rod (7) are both equidistantly distributed in an annular manner along the central axis of the wire barrel (5).

4. The intelligent low-voltage cable branch box according to claim 2, characterized in that: The drying portion (93) is evenly spaced along the inner edge of the U-shaped clamping claw (9); the drying portion (93) is a raised arc-shaped piece and is elastic; the drying portion (93) is formed by pressing a polymer membrane material; and the annular airbag (8) is made of TPU material.

5. The intelligent low-voltage cable branch box according to claim 2, characterized in that: When the connecting spring (54) is in an initial state, the upper end of the connecting rod (7) is located inside the active cavity (53), and the connecting rod (7) and the active cavity (53) are connected in a sliding and sealing manner.

6. The intelligent low-voltage cable branch box according to claim 2, characterized in that: The adaptive air replenishment assembly comprises an air guide cavity (71) arranged in a connecting rod (7); the upper end of the air guide cavity (71) penetrates through a top wall thereof and is provided with a first channel (74); the lower end of the air guide cavity (71) penetrates through a lower side wall of the connecting rod (7); a piston (6) is slidably arranged in the air guide cavity (71); and a magnetic cylinder (72) is fixedly installed in a lower end of the air guide cavity (71).

7. The intelligent low-voltage cable branch box according to claim 6, characterized in that: A magnetic block (62) is arranged at the lower end of the piston (6), and the opposing surfaces of the magnetic block (62) and the magnetic cylinder (72) are arranged with the same polarity. The piston (6) is slidably and hermetically connected to the air guide cavity (71). At room temperature, the piston (6) is located in the middle of the air guide cavity (71), and the lower end of the magnetic block (62) matches the inner cavity of the magnetic cylinder (72).

8. The intelligent low-voltage cable branch box according to claim 6, characterized in that: The adaptive air supply component further comprises a condensate chamber (91) and a drainage channel (92) arranged in the U-shaped clamp (9), the ends of the drainage channel (92) respectively passing through the bottom wall of the condensate chamber (91) and the outer side wall of the U-shaped clamp (9), the drainage channel (92) being arranged with a large upper end and a small lower end, and communicating with the air guide chamber (71) located at the lower side of the piston (6) and the condensate chamber (91).

9. The intelligent low-voltage cable branch box according to claim 8, characterized in that: The dehumidification assembly comprises a mounting groove (51), a conductive column (61) and a conductive tube (73); the mounting groove (51) is located at the upper end of the wire tube (5) and has an electric heating block (52) installed therein; the electric heating block (52) is annular and is arranged around the annular airbag (8); the conductive column (61) is located at the upper end of the piston (6); and the conductive tube (73) is located at the lower end of the first channel (74).

10. The intelligent low-voltage cable branch box according to claim 9, characterized in that: The input end of the electric heating block (52) is electrically connected to an external power source, the wire tube (5) is made of a high thermal conductivity material, an inner groove matching the first channel (74) is provided through the inside of the conductive tube (73), the conductive column (61) and the electric heating block (52) are electrically connected, and the end of the conductive column (61) matches the inner groove of the conductive tube (73).

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