Waterproof cable branch box with improved heat dissipation structure

Abstract

The invention discloses a waterproof cable branch box with an improved heat dissipation structure, and relates to the field of low-voltage power distribution equipment. A waterproof cable branch box with an improved heat dissipation structure comprises a branch box body, the branch box body is internally provided with a mounting cavity for mounting and branching a cable, the branch box body is rotatably connected with a box door at an opening of the mounting cavity, and the bottom of the branch box body is provided with a cable inlet and outlet communicated with the mounting cavity; when the cable is rapidly heated, the temperature in the mounting cavity can be rapidly and effectively reduced, the cable is prevented from being damaged due to high temperature, the cable protection capability is improved, cable faults caused by overheating are reduced, the service life of the cable is prolonged, oxygen is isolated through carbon dioxide, the possibility of spontaneous combustion of the cable is fundamentally eradicated, and the service life of the cable is prolonged. Safety of the cable branch box and internal cables is effectively guaranteed, fire risk is reduced, and stable operation of a power system is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage power distribution equipment, and in particular relates to a waterproof cable branch box with an improved heat dissipation structure. Background Art

[0002] In modern power supply systems, low-voltage cable branch boxes, as a key power equipment, are widely used in low-voltage power distribution systems in industrial and civil buildings. Their main functions are to realize the branching and transfer of cables, as well as to reasonably distribute electrical energy and provide power support for various electrical equipment and users.

[0003] However, in actual use, when a large current passes through the cable, the cable generates a large amount of heat due to the thermal effect of the current. Due to the imperfect heat dissipation structure design of the existing branch box, the heat cannot be dissipated quickly and effectively, which causes the cable temperature to rise sharply. Once the temperature exceeds the critical value that the cable can withstand, the cable is very likely to be damaged or even cause spontaneous combustion. This not only seriously affects the stability and reliability of the power supply, but also poses a great threat to the safety of personnel and surrounding facilities. At the same time, waterproof performance is also a major shortcoming of existing low-voltage cable branch boxes. In complex and changeable outdoor environments, such as rain, humid weather, or in low-lying areas prone to water accumulation, moisture can easily penetrate into the branch box. The intrusion of moisture may cause electrical components to short-circuit, corrode, and other faults, thereby affecting the normal operation of the branch box and shortening the service life of the equipment. In addition, in terms of fire prevention, existing branch boxes also lack effective protection measures. When the cable reaches the ignition point due to overheating or other reasons, the box cannot effectively isolate oxygen, and the fire is likely to spread, causing more serious safety accidents and bringing huge economic losses to power facilities and users. In view of this, the present invention is specially proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a waterproof cable branch box with an improved heat dissipation structure that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a waterproof cable branch box with an improved heat dissipation structure, comprising: a branch box body, wherein an installation cavity for installing and branching cables is provided in the branch box body, the branch box body is rotatably connected to a box door at the open mouth of the installation cavity, and a cable inlet and outlet connected to the installation cavity are provided at the bottom of the branch box body; an air storage cavity is provided in the branch box body and is located at the lower side of the installation cavity; a conveying channel is provided in the side wall of the branch box body, an air inlet of the conveying channel is connected to the air outlet of the air storage cavity, and an electromagnetic valve is installed in the air inlet of the conveying channel; a plurality of air jets are equidistantly provided on the side wall of the branch box body, and the conveying channel and the installation cavity are connected through the air jets; an opening connected to the installation cavity is provided at the upper end of the branch box body; a shielding canopy is fixedly installed at the upper end of the branch box body, and a monitoring cavity connected to the opening is provided inside the shielding canopy; a temperature sensor is fixedly installed in the monitoring cavity; an exhaust port connected to the monitoring cavity is provided on the shielding canopy, and a check valve is installed in the exhaust port.

[0006] In order to improve the waterproof effect of the branch box, a circle of groove is further provided on the branch box at the open mouth of the installation cavity, an expansion airbag ring is installed in the groove, and an annular airbag ring is fixedly connected to the cable inlet and outlet. Every two adjacent annular airbag rings are connected to each other through a connecting air pipe, and the expansion airbag ring is connected to one of the annular airbag rings through an air supply pipe.

[0007] In order to keep the pressure of the liquid carbon dioxide in the gas storage chamber at a high level at all times so as to maintain the state of the liquid carbon dioxide, a ring-shaped compression plate is sealingly and slidingly connected to the gas storage chamber, and a plurality of tensioning springs are fixedly connected to the lower side of the ring-shaped compression plate at equal intervals around the circumference, and the lower end of the tensioning spring is fixedly connected to the bottom of the gas storage chamber.

[0008] In order to facilitate the staff to know the content of liquid carbon dioxide in the gas storage chamber and replenish it in time, further, a rangefinder is embedded and fixedly connected to the upper end of the interior of the gas storage chamber, and the detection end of the rangefinder faces downward towards the compression annular compression plate. A replenishment port is opened on the gas storage chamber, and a one-way valve is installed in the replenishment port. The replenishment port on the gas storage chamber is set in the installation cavity.

[0009] In order to make the carbon dioxide fill the installation cavity more evenly and further improve the heat absorption, cooling and flame retardant effects on cables and cable components at various positions, the delivery channels are symmetrically opened in the inner walls on both sides of the branch box.

[0010] In order to further enhance the heat dissipation effect, maintain the temperature in the installation cavity, and better protect the cables, a water storage cavity is opened in the shelter, and a refrigeration component is installed in the water storage cavity. A first heat exchange copper column is equidistantly arranged around the outside of the monitoring cavity. The first heat exchange copper column is fixedly connected to the branch box and the shelter, the upper end of the first heat exchange copper column extends into the water storage cavity, and the lower end of the first heat exchange copper column extends into the installation cavity.

[0011] In order to further promote the heat dissipation and cooling effect in the installation cavity, further, the two sides of the branch box body are symmetrically fixedly connected with a cover shell, and the lower ends of both sides of the shelter are equidistantly fixedly connected with multiple water outlet pipes connected to the water storage cavity, and the water outlets of the water outlet pipes are inclined to face the box wall of the branch box body. A water pump is fixedly connected in the cover shell, and the water suction port of the water pump is connected to the water suction pipe. The water inlet of the water suction pipe is located on the lower side of the cover shell, and the water outlet of the water pump is connected to the return pipe, and the water outlet of the return pipe is connected to the water inlet of the water storage cavity.

[0012] In order to ensure that the temperature in the conveying channel is always maintained at a low temperature and avoid premature vaporization of liquid carbon dioxide, multiple rows of second heat exchange copper columns are fixedly connected at equal intervals on the outer wall of the branch box, and the second heat exchange copper columns extend into the conveying channel away from the end of the cover.

[0013] In order to prevent high-temperature water from directly flowing into the water storage chamber, the overall water temperature is controlled from the source to avoid drastic fluctuations in the water temperature in the chamber, and further, a temporary storage tank is provided at the upper end of the interior of the water storage chamber, the refrigeration component is provided in the temporary storage tank, and the water inlet of the water storage chamber is provided near the temporary storage tank.

[0014] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: when the cable wires inside the branch box heat up rapidly, the present invention can quickly and effectively reduce the temperature in the installation cavity, avoid cable damage due to high temperature, improve the protection capability of the cable, reduce cable failures caused by overheating, extend the service life of the cable, isolate oxygen through carbon dioxide, fundamentally eliminate the possibility of cable spontaneous combustion, effectively ensure the safety of the cable branch box and internal cables, reduce the risk of fire, and ensure the stable operation of the power system. The sealing between the cable wires, the branch box body and the box door is achieved by means of the extrusion and expansion of the airbag ring, preventing moisture from entering the branch box, avoiding electrical short circuits and other faults caused by water, and further improving the reliability and service life of the cable branch box.

[0015] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the attached figure:

[0017] Figure 1 This is a front view schematic diagram of the box door of the present invention when it is open;

[0018] Figure 2 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0019] Figure 3 It is a right side cross-sectional structural schematic diagram of the present invention;

[0020] Figure 4 For the present invention Figure 3 Schematic diagram of the local structure;

[0021] Figure 5 For the present invention Figure 2 Schematic diagram of the structure of part A;

[0022] Figure 6 For the present invention Figure 2 Schematic diagram of the structure of part B.

[0023] In the figure: 1. Branch box; 101. Installation cavity; 102. Cable inlet and outlet; 103. Air storage cavity; 104. Delivery channel; 105. Solenoid valve; 106. Jet port; 107. Annular compression plate; 108. Tension spring; 109. Rangefinder; 1010. Opening; 2. Box door; 201. Expansion airbag ring; 202. Annular airbag ring; 203. Air pipe; 3. Shelter; 301. Monitoring cavity; 302. Exhaust port; 303. Temperature sensor; 304. Water storage cavity; 305. Refrigeration component; 306. First heat exchange copper column; 307. Temporary storage tank; 308. Water outlet pipe; 309. Cover; 3010. Second heat exchange copper column; 3011. Water pump; 3012. Water extraction pipe; 3013. Return pipe. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0025] Example 1:

[0026] Reference Figures 1-6A waterproof cable branch box with an improved heat dissipation structure comprises: a branch box body 1, a mounting cavity 101 for installing and branching cables is provided in the branch box body 1, a box door 2 is rotatably connected to the opening of the mounting cavity 101 of the branch box body 1, and a cable inlet and outlet 102 communicating with the mounting cavity 101 is provided at the bottom of the branch box body 1; an air storage cavity 103 is provided in the branch box body 1 and is located at the lower side of the mounting cavity 101; a delivery channel 104 is provided in the side wall of the branch box body 1, an air inlet of the delivery channel 104 is connected to an air outlet of the air storage cavity 103, and an air inlet of the delivery channel 104 is connected to an air outlet of the air storage cavity 103. An electromagnetic valve 105 is installed in the air port; a plurality of air jets 106 are equidistantly provided on the side wall of the branch box 1, and the conveying channel 104 is connected to the installation cavity 101 through the air jets 106; an opening 1010 connected to the installation cavity 101 is provided at the upper end of the branch box 1; the shielding shed 3 is fixedly installed at the upper end of the branch box 1, and a monitoring cavity 301 connected to the opening 1010 is provided inside; a temperature sensor 303 is fixedly installed in the monitoring cavity 301; an exhaust port 302 connected to the monitoring cavity 301 is provided on the shielding shed 3, and a check valve is installed in the exhaust port 302.

[0027] A circle of groove is provided on the branch box 1 at the open mouth of the installation cavity 101, and an expansion airbag ring 201 is installed in the groove. An annular airbag ring 202 is fixedly connected to the cable inlet and outlet 102. Every two adjacent annular airbag rings 202 are connected to each other through a connecting air pipe, and the expansion airbag ring 201 is connected to one of the annular airbag rings 202 through an air supply pipe 203.

[0028] In the use of existing cable branch boxes, when a large current passes through the cable, the cable will generate a lot of heat due to the thermal effect of the current. Due to the lack of effective heat dissipation measures, the cable temperature may rise rapidly and exceed the critical value, thereby causing damage to the cable or spontaneous combustion, posing a major safety hazard. Before using the waterproof cable branch box with an improved heat dissipation structure, the staff first fills the gas storage chamber 103 with liquid carbon dioxide. When a large current passes through the cable, the cable releases a lot of heat, because the density of hot gas is greater than the density of air, the heat will enter the monitoring chamber 301 through the opening 1010. After the temperature sensor 303 detects the instantaneous increase in heat, it transmits the signal to the controller, and the controller controls the transmission channel 104. The solenoid valve 105 is opened, and the liquid carbon dioxide in the gas storage chamber 103 flows into the delivery channel 104 under the action of its own pressure, and is sprayed into the installation chamber 101 through the nozzle 106. After being sprayed out, the liquid carbon dioxide quickly vaporizes from liquid to gas. According to the principle of vaporization heat absorption, it will absorb a large amount of heat from the surrounding environment to achieve rapid cooling of the installation chamber 101, preventing the cable from being damaged due to excessive temperature. By utilizing the physical properties of carbon dioxide, which is denser than air, non-flammable and non-combustible, when the installation chamber 101 is filled with carbon dioxide, the carbon dioxide will wrap around the cable and isolate the cable from oxygen. Even if the cable temperature is too high, in the absence of oxygen, the problem of spontaneous combustion can be avoided.

[0029] In addition, when the staff closes the box door 2, the box door 2 will squeeze the expansion airbag ring 201, so that part of the gas in the expansion airbag ring 201 enters the annular airbag ring 202 through the gas pipe 203. After the annular airbag ring 202 expands, it wraps the cable. At the same time, the branch box body 1 and the box door 2 are sealed under the action of the expansion airbag ring 201, which not only prevents moisture from entering the installation cavity 101, but also isolates the air, ensuring the waterproof protection effect of the branch box.

[0030] When the internal cables of the branch box heat up rapidly, the temperature inside the installation cavity 101 can be quickly and effectively reduced, thereby preventing the cables from being damaged due to high temperature, improving the protection capability of the cables, reducing cable failures caused by overheating, and extending the service life of the cables. By isolating oxygen through carbon dioxide, the possibility of spontaneous combustion of the cables is fundamentally eliminated, effectively ensuring the safety of the cable branch box and internal cables, reducing the risk of fire, and ensuring the stable operation of the power system. The sealing between the cables, the branch box body 1 and the box door 2 is achieved by means of the extrusion and expansion of the airbag ring, preventing moisture from entering the branch box, avoiding electrical short circuits and other failures caused by water, and further improving the reliability and service life of the cable branch box.

[0031] Example 2:

[0032] Reference Figures 1-6, a waterproof cable branch box with an improved heat dissipation structure is basically the same as Example 1. Furthermore, a circle of annular compression plate 107 is sealed and slidably connected in the air storage chamber 103, and a plurality of tensioning springs 108 are fixedly connected to the lower side of the annular compression plate 107 at equidistant intervals in the circumference. The lower end of the tensioning spring 108 is fixedly connected to the bottom of the air storage chamber 103. Through the arrangement of the tensioning spring 108 and the annular compression plate 107, when the liquid carbon dioxide content in the air storage chamber 103 gradually decreases, the annular compression plate 107 will move upward under the action of the tensioning spring 108, so that the pressure of the liquid carbon dioxide in the air storage chamber 103 is always in a large state, so as to maintain the state of the liquid carbon dioxide, thereby ensuring the cooling and flame retardant effect of the cable assembly during subsequent use.

[0033] A rangefinder 109 is embedded and fixedly connected to the upper end of the inner part of the air storage chamber 103, and the detection end of the rangefinder 109 faces downward towards the compression annular compression plate 107. A replenishing port is opened on the air storage chamber 103, and a one-way valve is installed in the replenishing port. The replenishing port on the air storage chamber 103 is set in the installation chamber 101. Through the setting of the rangefinder 109, the distance from the annular compression plate 107 to the top of the air storage chamber 103 can be monitored. When the liquid carbon dioxide content in the air storage chamber 103 is low, it is convenient to notify the staff to replenish liquid carbon dioxide into the air storage chamber 103 through the replenishing port, so as to avoid affecting the subsequent cooling and flame retardant effect due to too little liquid carbon dioxide.

[0034] Example 3:

[0035] Reference Figures 1-6 A waterproof cable branch box with an improved heat dissipation structure is basically the same as Example 2. Furthermore, the conveying channels 104 are symmetrically opened in the inner walls on both sides of the branch box body 1.

[0036] When the liquid carbon dioxide in the gas storage chamber 103 is sprayed into the installation chamber 101 through the delivery channel 104, since the delivery channels 104 are symmetrically opened on both sides of the branch box 1, the two streams of carbon dioxide will collide with each other, thereby making the carbon dioxide fill the installation chamber 101 more evenly, further improving the heat absorption, cooling and flame retardant effects on the cables and cable assemblies at various positions.

[0037] Example 4:

[0038] Reference Figures 1-6A waterproof cable branch box with an improved heat dissipation structure is basically the same as Example 3. Furthermore, a water storage chamber 304 is opened in the shelter 3, and a refrigeration component 305 is installed in the water storage chamber 304. First heat exchange copper columns 306 are equidistantly arranged around the outer side of the monitoring chamber 301. The first heat exchange copper columns 306 are fixedly connected to the branch box body 1 and the shelter 3. The upper end of the first heat exchange copper column 306 extends into the water storage chamber 304, and the lower end of the first heat exchange copper column 306 extends into the installation chamber 101.

[0039] The first heat exchange copper column 306 is made of copper, which has excellent thermal conductivity. The heat generated by the cable in the installation cavity 101 can be quickly conducted to the water storage cavity 304 through the first heat exchange copper column 306. The refrigeration component 305 in the water storage cavity 304 can reduce the temperature of the water in the water storage cavity 304. The heat conducted through the first heat exchange copper column 306 can be absorbed by the low-temperature water, further enhancing the heat dissipation effect, maintaining the temperature in the installation cavity 101, and better protecting the cable.

[0040] Moreover, during normal use, the first heat exchange copper column 306 can be used to dissipate heat and cool the cables and cable components in the installation cavity 101 without opening heat dissipation holes, thereby effectively ensuring the waterproof effect of the branch box.

[0041] Example 5:

[0042] Reference Figures 1-6, a waterproof cable branch box with an improved heat dissipation structure, which is basically the same as Example 4, and further, a cover shell 309 is symmetrically fixedly connected to both sides of the branch box body 1, and a plurality of water outlet pipes 308 connected to the water storage chamber 304 are fixedly connected at equal distances to the lower ends of both sides of the shielding shed 3, and the water outlets of the water outlet pipes 308 are inclined to face the box wall of the branch box body 1, and a water pump 3011 is fixedly connected to the cover shell 309, and the water suction port of the water pump 3011 is connected to the water suction pipe 3012, and the water inlet of the water suction pipe 3012 is located at the lower side of the cover shell 309, and the water outlet of the water pump 3011 is connected to the return pipe 3013, and the water outlet of the return pipe 3013 is connected to the water inlet of the water storage chamber 304, and the water outlet pipe 308 is connected to the water storage chamber 304, and water flows out from the water outlet pipe 308 and sprays obliquely toward the box wall of the branch box body 1, which is beneficial Due to the large specific heat capacity of water, when water comes into contact with the box wall, it can absorb the heat of the box wall and effectively cool the box wall. Afterwards, the water on the lower side of the cover 309 is extracted by the water pump 3011 through the water pump pipe 3012, and then sent back to the water storage chamber 304 through the return pipe 3013, forming a circulating cooling system to continuously cool the box wall. After the box wall temperature is reduced, it can further promote the heat in the installation cavity 101 to be transferred to the outside through the box wall. Combined with the first heat exchange copper column 306, this heat dissipation process can be accelerated, the overall temperature in the box can be reduced, and the safe and stable operation of the cable can be guaranteed. The branch box 1 may be deformed due to thermal expansion and contraction when it runs in a high-temperature environment for a long time, affecting its sealing and structural stability. Cooling the box wall can effectively control the box temperature, reduce the risk of thermal deformation, extend the service life of the branch box 1, and ensure reliable operation of the equipment.

[0043] A plurality of rows of second heat exchange copper columns 3010 are fixedly connected at equal intervals on the outer wall of the branch box body 1. The second heat exchange copper columns 3010 extend into the delivery channel 104 at one end away from the cover shell 309. When the flowing water flows on the surface of the box wall of the branch box body 1, it fully contacts the box wall to form an efficient heat exchange process. Since the specific heat capacity of water is large, it can absorb a large amount of heat, and the second heat exchange copper columns 3010 conduct the heat of the delivery channel 104 to the box wall of the branch box body 1. The flowing water can quickly take away the heat when flowing through, so that the internal temperature of the delivery channel 104 drops rapidly. This cooling method is continuous and stable, which can effectively avoid heat accumulation in the delivery channel 104, ensure that the liquid carbon dioxide is always in a low temperature environment during the delivery process, reduce the risk of vaporization, and flexibly adjust the cooling effect on the delivery channel 104 by controlling the flow rate and circulation speed of the flowing water. When the system detects When the temperature of the conveying channel 104 rises, the power of the water pump 3011 can be appropriately increased to speed up the water circulation and enhance the cooling effect. Otherwise, the circulation speed can be reduced to achieve precise temperature control. This allows the liquid carbon dioxide to remain in liquid form during the conveying process, ensuring that it vaporizes and absorbs heat only after entering the installation cavity 101, thereby maximizing the cooling efficiency of internal components. The circulation of water on the box wall can continuously take away the heat of the conveying channel 104. Compared with relying solely on air heat dissipation, it is less affected by external environmental factors. Regardless of how the external ambient temperature changes, it can provide stable cooling protection for the conveying channel 104, avoiding premature vaporization of liquid carbon dioxide due to increased ambient temperature, ensuring that it releases all its heat absorption capacity in the installation cavity 101, effectively protecting internal equipment such as cables, and improving the reliability and stability of the entire cable branch box cooling system.

[0044] A temporary storage tank 307 is provided at the upper end of the water storage chamber 304, and the refrigeration element 305 is provided in the temporary storage tank 307. The water inlet of the water storage chamber 304 is provided at a position close to the temporary storage tank 307. The temporary tank 307 serves as an independent pre-cooling area, and the refrigeration element 305 is centrally provided therein, so that the heated reflux water enters from the water inlet of the water storage chamber 304 and contacts the low-temperature environment at the first time. The refrigeration element 305 can quickly absorb the heat in the water and significantly reduce the water temperature. For example, when the circulating water absorbs a large amount of heat from the wall of the branch box 1 and the temperature rises, it can quickly reduce the temperature to an appropriate level by passing through the refrigeration element 305 in the temporary storage tank 307. range, avoiding high-temperature water from directly flowing into the water storage chamber 304, and controlling the overall water temperature from the source. If high-temperature water directly enters the water storage chamber 304, it will cause the water temperature in the chamber to fluctuate violently, affecting the overall refrigeration efficiency of the refrigeration component 305 and the cooling effect of the water. The provision of the temporary storage tank 307 can enable the heated reflux water to complete preliminary cooling before entering the water storage chamber 304, ensuring that the water entering the water storage chamber 304 is maintained at a relatively low and stable temperature level, ensuring that the water in the water storage chamber 304 is always in a low-temperature state for efficient heat dissipation, providing a stable low-temperature water source for the outlet pipe 308 to spray water to cool the wall of the branch box body 1, thereby improving the stability of the entire cooling system.

[0045] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiment, it is not intended to limit the present invention.

Claims

1. A waterproof cable branch box with improved heat dissipation structure, characterized in that: include: A branch box (1) is provided with an installation cavity (101) for installing and branching cables, the branch box (1) is rotatably connected to a box door (2) at the opening of the installation cavity (101), and a cable inlet and outlet (102) communicating with the installation cavity (101) is provided at the bottom of the branch box (1); An air storage cavity (103) is provided in the branch box (1) and is located on the lower side of the installation cavity (101); A delivery channel (104) is provided in the side wall of the branch box (1), an air inlet of the delivery channel (104) is connected to an air outlet of the air storage chamber (103), and an electromagnetic valve (105) is installed in the air inlet of the delivery channel (104); A plurality of air jets (106) are equidistantly provided on the side wall of the branch box (1), and the delivery channel (104) is connected to the installation cavity (101) via the air jets (106); The upper end of the branch box (1) is provided with an opening (1010) communicating with the installation cavity (101); A shielding shed (3) is fixedly mounted on the upper end of the branch box (1), and has a monitoring cavity (301) therein that is in communication with the opening (1010); A temperature sensor (303) is fixedly installed in the monitoring cavity (301); The shielding shed (3) is provided with an exhaust port (302) connected to the monitoring chamber (301), and a check valve is installed in the exhaust port (302).

2. A waterproof cable branch box with improved heat dissipation structure according to claim 1, characterized in that: The branch box (1) is provided with a circle of grooves at the opening of the installation cavity (101), an expansion airbag ring (201) is installed in the groove, an annular airbag ring (202) is fixedly connected to the cable inlet and outlet (102), every two adjacent annular airbag rings (202) are connected to each other through a connecting air pipe, and the expansion airbag ring (201) is connected to one of the annular airbag rings (202) through an air transmission pipe (203).

3. The waterproof cable branch box with improved heat dissipation structure according to claim 1, characterized in that: A ring-shaped compression plate (107) is sealed and slidably connected inside the air storage chamber (103); a plurality of tension springs (108) are fixedly connected to the lower side of the ring-shaped compression plate (107) at equal intervals in a circumference; and the lower ends of the tension springs (108) are fixedly connected to the bottom of the air storage chamber (103).

4. A waterproof cable branch box with improved heat dissipation structure according to claim 3, characterized in that: A rangefinder (109) is embedded and fixedly connected to the upper end of the air storage chamber (103), and the detection end of the rangefinder (109) faces downward toward the compression ring compression plate (107). A replenishing port is opened on the air storage chamber (103), and a one-way valve is installed in the replenishing port. The replenishing port on the air storage chamber (103) is arranged in the installation chamber (101).

5. The waterproof cable branch box with improved heat dissipation structure according to claim 1, characterized in that: The conveying channels (104) are symmetrically opened in the inner walls on both sides of the branch box (1).

6. The waterproof cable branch box with improved heat dissipation structure according to claim 5, characterized in that: A water storage chamber (304) is provided in the shelter (3), a refrigeration component (305) is installed in the water storage chamber (304), first heat exchange copper columns (306) are equidistantly arranged around the outer side of the monitoring chamber (301), the first heat exchange copper columns (306) are fixedly connected to the branch box (1) and the shelter (3), the upper end of the first heat exchange copper column (306) extends into the water storage chamber (304), and the lower end of the first heat exchange copper column (306) extends into the installation chamber (101).

7. The waterproof cable branch box with improved heat dissipation structure according to claim 6, characterized in that: The two sides of the branch box (1) are symmetrically fixedly connected with a cover shell (309); the lower ends of both sides of the shelter (3) are equidistantly fixedly connected with a plurality of water outlet pipes (308) connected to the water storage chamber (304); the water outlets of the water outlet pipes (308) are inclined toward the box wall of the branch box (1); a water pump (3011) is fixedly connected inside the cover shell (309); the water suction port of the water pump (3011) is connected to the water suction pipe (3012); the water inlet of the water suction pipe (3012) is located on the lower side of the cover shell (309); the water outlet of the water pump (3011) is connected to the return pipe (3013); the water outlet of the return pipe (3013) is connected to the water inlet of the water storage chamber (304).

8. The waterproof cable branch box with improved heat dissipation structure according to claim 7, characterized in that: Multiple rows of second heat exchange copper columns (3010) are fixedly connected at equal intervals to the outer wall of the branch box (1), and one end of the second heat exchange copper columns (3010) away from the cover (309) extends into the conveying channel (104).

9. The waterproof cable branch box with improved heat dissipation structure according to claim 7, characterized in that: A temporary storage tank (307) is provided at the upper inner end of the water storage chamber (304), the refrigeration component (305) is arranged in the temporary storage tank (307), and the water inlet of the water storage chamber (304) is arranged at a position close to the temporary storage tank (307).

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