Buried optical cable junction box for communication base station

Abstract

The utility model relates to communication cable technical field, and disclose a kind of communication base station is buried optical cable junction box, solve the problem proposed in background art, it includes box, lid and sealing structure, the joint surface of box and lid is equipped with annular sealing cavity, the sealing cavity is filled with compressible gas, and connect thermal expansion drive assembly, the thermal expansion drive assembly includes metal bellows and working substance cabin, the working substance cabin is filled with working substance with boiling point below 80 DEG C, the utility model, with the sealing performance and reliability of ensuring optical cable junction box, can realize the sealing enhancement and fault alarm of automation, greatly improve the maintenance efficiency and operating stability effect of communication base station infrastructure.

Description

Technical Field

[0001] This utility model belongs to the field of communication optical cable technology, specifically a buried optical cable junction box for communication base stations. Background Technology

[0002] Existing underground optical cable junction boxes typically employ a static sealing structure, relying on the compression and deformation of rubber sealing strips or silicone gaskets to achieve waterproofing and dustproofing.

[0003] In low-temperature environments (such as below -30℃), the rubber sealing strip is prone to hardening and loss of elasticity, leading to sealing failure. Water can easily seep into the box and freeze, affecting the quality of fiber optic splicing. In high-temperature environments (such as above 60℃), the sealing strip is prone to softening and expansion. After long-term pressure, it undergoes permanent deformation, resulting in a decrease in sealing pressure and reduced waterproof performance. The existing junction box sealing structure cannot self-adjust. As the sealing strip ages, the sealing force gradually weakens, but it cannot automatically compensate, leading to an increased risk of water leakage. Therefore, we propose an underground optical cable junction box for communication base stations. Utility Model Content

[0004] To address the problems mentioned in the background art, this utility model provides the following technical solution: a buried optical cable junction box for communication base stations, comprising a box body, a box cover, and a sealing structure. An annular sealing cavity is provided at the joint surface between the box body and the box cover. The sealing cavity is filled with compressible gas and connected to a thermal expansion drive assembly.

[0005] The thermal expansion drive assembly includes a metal bellows and a working fluid chamber, the working fluid chamber being filled with a working fluid with a boiling point below 80°C.

[0006] Preferably, the air pressure in the sealing cavity increases with temperature, driving the sealing strip to expand radially to enhance sealing pressure. By driving the sealing strip to expand through air pressure changes, dynamic adjustment of sealing performance is achieved, which can better adapt to changes in ambient temperature and ensure the sealing reliability of the junction box under different working conditions.

[0007] Preferably, the working medium is acetone, ethanol, or Freon, all of which have boiling points below 80°C and can undergo phase change at lower temperatures, thereby generating a large expansion force that drives the metal bellows to expand and contract, thus increasing the gas pressure inside the sealed cavity.

[0008] Preferably, the sealing cavity is connected to a pressure balancing valve via an air guide pipe. The opening pressure of the pressure balancing valve is 0.2MPa to 0.5MPa. When the air pressure in the sealing cavity exceeds a certain value, the pressure balancing valve opens to release the excess pressure and prevent the sealing cavity from being damaged due to excessive pressure. At the same time, the air pressure in the sealing cavity can be effectively regulated through the air guide pipe connection, ensuring that the sealing system operates within a safe range.

[0009] Preferably, the axial extension stroke of the metal bellows is 5mm to 15mm, and the wall thickness of the bellows is 0.3mm to 0.8mm. The extension stroke determines the maximum displacement that the metal bellows can withstand, while the wall thickness affects its strength and durability. By reasonably selecting the extension stroke and wall thickness, it can be ensured that the metal bellows can meet the displacement required for the expansion of the working fluid during operation, while maintaining sufficient strength and reliability.

[0010] Preferably, a temperature sensor is provided on the top of the enclosure, which is connected to an alarm indicator light on the outer wall of the enclosure to monitor the temperature changes inside the enclosure in real time. When the temperature rises abnormally, the alarm indicator light will light up to remind maintenance personnel to check and handle the situation in time, thereby avoiding sealing failure or other malfunctions caused by excessive temperature.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] During operation, before installation of the junction box, the sealed cavity is pre-filled with compressible gas at a certain pressure, and the working fluid chamber is filled with an appropriate amount of low-boiling-point working fluid. The pressure balancing valve is closed, the gas pressure in the sealed cavity is at the initial set value, and the temperature sensor is in standby mode, monitoring the temperature inside the box in real time. When the ambient temperature rises, the working fluid in the working fluid chamber begins to expand, pushing the metal bellows to extend and retract. The extension and retraction of the metal bellows transmits pressure to the gas in the sealed cavity, increasing the gas pressure inside the sealed cavity. The gas pressure inside the sealed cavity pushes the sealing strip to expand radially, enhancing the sealing pressure and ensuring the sealing performance between the box and the box cover. If the gas pressure inside the sealed cavity exceeds the set range of 0.2MPa to 0.5MPa, the pressure balancing valve automatically opens to release the excess pressure. When the gas pressure drops to a safe range, the pressure balancing valve... The system is closed to maintain stable air pressure within the sealed chamber. A temperature sensor continuously monitors temperature changes within the chamber. If the temperature is normal, the alarm indicator light remains off. When the temperature exceeds a preset threshold, the temperature sensor detects an abnormal signal, and the alarm indicator light illuminates, alerting maintenance personnel to promptly inspect and address the issue. If the air pressure within the sealed chamber rises abnormally, the pressure balancing valve automatically opens to release excess pressure and prevent damage to the sealed chamber. Maintenance personnel can use the alarm indicator light to check for leaks in the working fluid chamber or damage to the sealing strips, and perform appropriate repairs or replacements. This system effectively addresses complex underground environments, ensuring the sealing performance and reliability of the optical cable junction box. It enables automated sealing enhancement and fault alarms, significantly improving the maintenance efficiency and operational stability of communication base station infrastructure. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a front view of the overall structure of this utility model;

[0015] In the diagram: 1. Box body; 101. Sealed cavity; 102. Thermal expansion drive assembly; 1021. Metal bellows; 1022. Working fluid chamber; 103. Sealing strip; 104. Pressure balancing valve; 105. Air guide pipe; 106. Temperature sensor; 107. Alarm indicator light; 2. Box cover. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] Depend on Figure 1 The present invention includes a housing 1, a lid 2, and a sealing structure. An annular sealing cavity 101 is provided at the joint surface between the housing 1 and the lid 2. The sealing cavity 101 is filled with compressible gas and connected to a thermal expansion drive assembly 102.

[0018] The thermal expansion drive assembly 102 includes a metal bellows 1021 and a working fluid chamber 1022, the working fluid chamber 1022 being filled with a working fluid with a boiling point below 80°C.

[0019] The air pressure in the sealed cavity 101 increases with the temperature, which pushes the sealing strip 103 to expand radially to enhance the sealing pressure. By driving the sealing strip to expand through air pressure changes, the sealing performance is dynamically adjusted, which can better adapt to changes in ambient temperature and ensure the sealing reliability of the junction box under different working conditions.

[0020] The working medium is acetone, ethanol, or Freon. These working media have boiling points below 80°C and can undergo a phase change from liquid to gas at a relatively low temperature, thereby generating a large expansion force that drives the metal bellows to expand and contract, thus increasing the gas pressure inside the sealed cavity.

[0021] The sealed cavity 101 is connected to the pressure balancing valve 104 via the air guide pipe 105. The opening pressure of the pressure balancing valve 104 is 0.2MPa to 0.5MPa. When the air pressure in the sealed cavity exceeds a certain value of 0.2MPa to 0.5MPa, the pressure balancing valve opens to release the excess pressure and prevent the sealed cavity from being damaged due to excessive pressure. At the same time, the air pressure in the sealed cavity can be effectively regulated through the air guide pipe connection to ensure that the sealing system operates within a safe range.

[0022] The axial expansion stroke of the metal bellows 1021 is 5mm to 15mm, and the wall thickness of the bellows is 0.3mm to 0.8mm. The expansion stroke determines the maximum displacement that the metal bellows can withstand, while the wall thickness affects its strength and durability. By reasonably selecting the expansion stroke and wall thickness, it can be ensured that the metal bellows can meet the displacement required for the expansion of the working fluid during operation, while maintaining sufficient strength and reliability.

[0023] A temperature sensor 106 is installed on the top of the enclosure 1. The temperature sensor 106 is connected to the alarm indicator light 107 on the outer wall of the enclosure 1 to monitor the temperature change inside the enclosure in real time. When the temperature rises abnormally, the alarm indicator light will light up to remind maintenance personnel to check and deal with it in time, thereby avoiding sealing failure or other malfunctions caused by excessive temperature.

[0024] Working Principle: During operation, before installation of the junction box, the sealed cavity 101 is pre-filled with compressible gas at a certain pressure. The working fluid chamber 1022 is filled with an appropriate amount of low-boiling-point working fluid such as acetone, ethanol, or Freon. The pressure balancing valve 104 is in the closed state, and the gas pressure in the sealed cavity is at the initial set value. The temperature sensor 106 is in standby mode, monitoring the temperature inside the box in real time. When the ambient temperature rises, the working fluid in the working fluid chamber begins to expand, pushing the metal bellows 1021 to extend and retract. The extension and retraction of the metal bellows transmits pressure to the gas in the sealed cavity, increasing the gas pressure inside the sealed cavity. The gas pressure inside the sealed cavity pushes the sealing strip 103 to expand radially, enhancing the sealing pressure and ensuring the sealing performance between the box and the box cover. If the gas pressure inside the sealed cavity exceeds the set range of 0.2MPa to 0.5MPa, the pressure balancing valve 104 automatically opens to release the excess pressure. When the gas pressure drops to the safe level... When the pressure is within the full range, the pressure balancing valve is closed to maintain stable air pressure in the sealed cavity. The temperature sensor 106 continuously monitors the temperature change inside the box. If the temperature is normal, the alarm indicator 107 remains off. When the temperature inside the box exceeds the preset threshold, the temperature sensor 106 detects an abnormal signal, and the alarm indicator 107 lights up, reminding maintenance personnel to check and handle the situation promptly. If the air pressure inside the sealed cavity rises abnormally, the pressure balancing valve 104 will automatically open to release excess pressure and prevent damage to the sealed cavity. Maintenance personnel can check whether the working medium in the working medium chamber is leaking or whether the sealing strip is damaged based on the alarm indicator and perform corresponding repairs or replacements. This system can effectively cope with complex underground environments, ensure the sealing performance and reliability of the optical cable junction box, and achieve automated sealing enhancement and fault alarm, greatly improving the maintenance efficiency and operational stability of communication base station infrastructure.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A buried optical cable junction box for a communication base station, characterized in that: It includes a housing (1), a lid (2), and a sealing structure. An annular sealing cavity (101) is provided at the joint surface between the housing (1) and the lid (2). The sealing cavity (101) is filled with compressible gas and connected to a thermal expansion drive assembly (102). The thermal expansion drive assembly (102) includes a metal bellows (1021) and a working fluid chamber (1022), the working fluid chamber (1022) being filled with a working fluid with a boiling point below 80°C.

2. The buried optical cable junction box for a communication base station according to claim 1, characterized in that: The air pressure in the sealed cavity (101) increases with the temperature, which pushes the sealing strip (103) to expand radially to enhance the sealing pressure.

3. The buried optical cable junction box for a communication base station according to claim 2, characterized in that: The working medium is acetone, ethanol, or Freon.

4. The buried optical cable junction box for a communication base station according to claim 3, characterized in that: The sealed cavity (101) is connected to the pressure balancing valve (104) through the air guide pipe (105), and the opening pressure of the pressure balancing valve (104) is 0.2MPa to 0.5MPa.

5. A buried optical cable junction box for a communication base station according to claim 4, characterized in that: The axial extension stroke of the metal bellows (1021) is 5mm to 15mm, and the wall thickness of the bellows is 0.3mm to 0.8mm.

6. A buried optical cable junction box for a communication base station according to claim 5, characterized in that: A temperature sensor (106) is provided on the top of the enclosure (1), and the temperature sensor (106) is connected to an alarm indicator light (107) on the outer wall of the enclosure (1).

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