An outdoor switch auxiliary terminal box

Abstract

This invention discloses an outdoor switch auxiliary terminal box. The housing of this device consists of a fixed housing assembly and a movable housing assembly connected by an inclined connecting plate with a sealing strip. An air intake assembly is located at the bottom of the movable housing assembly. The air intake assembly consists of a grid plate and three layers of graded filter cloth. The three layers of filter cloth are, in sequence, PP non-woven fabric, silica-doped glass fiber cotton, and ultra-fine fiber filter cloth with molecular sieves, achieving graded dust removal and dehumidification of the incoming air. Inside the box, there is an air guiding and supply structure consisting of an inclined air guide plate, a heating fan, and an exhaust fan, allowing dry airflow to circulate around the terminal blocks and drive away moisture. The side walls of the box are equipped with a wire-passing assembly with a pressure ring sealing structure and an exhaust assembly with an internal one-way breathable membrane, achieving one-way exhaust of exhaust gas and preventing backflow of moisture and dust. This invention purifies the air from the air intake source, and combined with a directional circulating air duct for local temperature control and dehumidification, significantly reduces energy consumption. The multiple sealing structures prevent water vapor and dust from penetrating, effectively suppressing condensation inside the box.

Description

Technical Field

[0001] This invention relates to the field of outdoor terminal box technology, and in particular to an outdoor switch auxiliary terminal box. Background Technology

[0002] Outdoor terminal boxes are core components of outdoor switchgear in power systems. They are mainly used to install auxiliary switches, terminals, control circuits, and other components, undertaking key functions such as signal transmission, control command transmission, and status feedback. With the popularization of smart grids, unattended substations, and remote online monitoring technologies, the operational reliability of terminal boxes directly determines the safety and stability of power lines, switchgear, and secondary circuits. Outdoor environments often face harsh conditions such as high humidity, fog, large temperature differences, salt spray, and condensation. Moisture prevention, condensation prevention, and corrosion prevention inside terminal boxes have become common technical challenges in the industry. Existing technologies mainly focus on optimizing the box's sealing, heating for moisture removal, and passive ventilation, but they cannot fundamentally solve the problem of moisture intrusion.

[0003] Existing outdoor terminal boxes generally adopt a structure of box body, low-power heater and vent at the bottom. The heater inside the outdoor terminal box can only increase the temperature inside the box and reduce the relative humidity, but cannot filter the humid air outside. The vent directly connects the inside and outside, and high-humidity air continuously invades, and moisture accumulates inside the box to form condensation.

[0004] In addition, the heater operates continuously for a long time, consumes a lot of electricity, has a limited lifespan, and poses safety hazards such as overheating, short circuits, and ignition of surrounding components. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that existing outdoor terminal boxes are prone to external moisture and dust intrusion, easy condensation, high energy consumption for heating and dehumidification, and poor safety.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an outdoor switch auxiliary terminal box, including a fixed shell assembly fixedly installed on an external bracket and a movable shell assembly detachably connected to the bottom of the fixed shell assembly via a connecting plate. The bottom of the movable shell assembly is provided with an air intake component for dust removal and moisture absorption. The side wall of the fixed shell assembly is provided with a wire-passing component and an exhaust component. The wire-passing component is provided with a sealing structure for sealing the gaps in the wire harness. The exhaust component is provided with a one-way ventilation structure. An air intake and exhaust component is provided between the air intake and exhaust components. The terminal block is located in the middle of the air intake and exhaust structure.

[0007] Preferably, the connection between the fixed shell assembly and the movable shell assembly is rectangular in shape, the connecting plates are inclined and distributed at the joint between the fixed shell and the movable shell, the connecting plates are distributed in pairs, and a sealing strip is provided between the two connecting plates.

[0008] Preferably, the air intake assembly is located inside the opening at the bottom of the movable shell assembly. The air intake assembly includes a grille plate fixedly disposed at the bottom of the opening and a multi-layer filter cloth structure arranged above the grille plate. The inner walls of the movable shell assembly are provided with main pressure strips for the multi-layer filter cloth structure to be horizontally inserted.

[0009] Preferably, the multi-layer filter cloth structure includes a primary filter cloth, a secondary filter cloth, and a fine filter cloth arranged sequentially from bottom to top. The primary filter cloth is a high-density PP polypropylene primary non-woven fabric, the secondary filter cloth is made of glass fiber medium-efficiency filter cotton, and the secondary filter cloth is filled with modified silica gel particles. The fine filter cloth is made of ultra-fine fiber filter cloth, and the fine filter cloth is provided with a molecular sieve desiccant composite layer inside.

[0010] Preferably, the length of the fine filter cloth is greater than the length of the medium filter cloth and the primary filter cloth. The movable shell assembly is provided with three pairs of main pressure strips corresponding to the primary filter cloth, the medium filter cloth and the fine filter cloth respectively. The fine filter cloth covers both ends of the primary filter cloth and the medium filter cloth. A tail pressure strip is provided on the side of the movable shell assembly away from the main pressure strips. A gap is provided between the tail pressure strip and the bottom of the movable shell assembly for the movable end of the fine filter cloth to be inserted.

[0011] Preferably, the air intake and air guiding structure includes an air guide plate fixedly disposed in the middle of the movable shell assembly. The air guide plate is inclined and its bottom end is located directly above the air intake assembly. A heating fan is disposed on one side of the top of the air guide plate and is arranged vertically. An exhaust fan is disposed on the inner side of the exhaust assembly and is located directly above the heating fan.

[0012] Preferably, the cable guide assembly includes a cable guide box fixed to the side wall of the movable housing assembly, a protective cover that blocks the entrance of the cable guide box is fixedly provided on the outer side wall of the movable housing assembly, and the sealing structure is provided inside the cable guide box.

[0013] Preferably, the sealing structure includes a wire pass sleeve fixed to the wire pass box and a pressure ring threaded to the outer end of the wire pass sleeve. Both the wire pass sleeve and the pressure ring are annular. A sealing ring is embedded inside the wire pass sleeve, and the wire pass sleeves are arranged in an array inside the wire pass box.

[0014] Preferably, the exhaust structure includes a pressure platform fixed to the inner wall of the fixed housing assembly, a plug box fitted with a sliding sleeve at the end of the pressure platform, and a mounting base plate fixed to the plug box. The mounting base plate is fixedly connected to the fixed housing assembly by locking bolts. A one-way breathable membrane is provided between the pressure platform and the mounting base plate. A connecting platform is fixed on the mounting base plate. The output end of the air intake and air guide structure is connected to the connecting platform.

[0015] Preferably, the movable end of the pressure table is provided with a U-shaped convex structure, the outer side wall of the convex structure is attached to the inner side wall of the plug box, and the edge of the one-way breathable membrane is attached to the inner side wall of the plug box.

[0016] This invention provides an outdoor switch auxiliary terminal box, which has the following beneficial effects.

[0017] 1. An air intake assembly with three layers of graded filter media is installed at the bottom of the box. Outside air is filtered through primary, middle and fine filters to remove dust and adsorb moisture. Dust and moisture are intercepted from the air intake source, preventing high humidity and dirty air from directly entering the box. This reduces the causes of condensation from the source and overcomes the defects of traditional terminal boxes that allow wet dust air to enter directly through the opening.

[0018] 2. By using an inclined air guide plate in conjunction with a heating fan and an exhaust fan to form a directional airflow duct, the dry and purified airflow surrounds and blows around the central terminal block. Relying on the pre-dehumidified air intake and local heating to drive away moisture, the whole machine heater does not need to be continuously powered on for a long time, which effectively reduces the energy consumption of the equipment and avoids the safety hazards of overheating and short circuits and ignition of components during long-term operation of the heater.

[0019] 3. The exhaust assembly is equipped with a one-way breathable membrane structure, which allows hot and humid exhaust gas inside the box to be discharged outwards, preventing external humid air from flowing back into the box. Combined with the wire harness sealing structure consisting of pressure rings and sealing rings inside the cable passing assembly, and the inclined connecting plate with sealing strips at the shell joints, multiple seals are applied to the gaps between the cables and the box, comprehensively preventing moisture and dust from entering the box from various assembly gaps, further improving the box's airtight, moisture-proof, and dust-proof effect. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the internal structure of the movable shell assembly in an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the fixed shell assembly in an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the internal structure of the exhaust assembly in an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the wire guide assembly in an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the wire sleeve and pressure ring in an embodiment of the present invention.

[0026] In the diagram: 1. Fixed housing assembly; 11. Terminal block; 12. Heater; 13. Heating fan; 2. Movable shell assembly; 21. Air guide plate; 3. Connecting plate; 4. Intake assembly; 41. Grille; 42. Primary filter cloth; 43. Secondary filter cloth; 44. Fine filter cloth; 45. Main pressure strip; 46. Rear pressure strip; 5. Cable guide assembly; 51. Protective cover; 52. Cable guide box; 53. Cable guide sleeve; 54. Sealing ring; 55. Pressure ring; 6. Exhaust assembly; 61. Exhaust fan; 62. Mounting base plate; 63. Connecting platform; 64. Pressing platform; 65. Plug-in box; 66. Locking bolt; 67. One-way breathable membrane. Detailed Implementation like Figures 1 to 6 As shown, the present invention provides an outdoor switch auxiliary terminal box, including a fixed housing assembly 1 fixedly mounted on an external bracket and a movable housing assembly 2 detachably connected to the bottom of the fixed housing assembly 1 via a connecting plate 3. The bottom of the movable housing assembly 2 is provided with an air intake assembly 4 for dust removal and moisture absorption. The side wall of the fixed housing assembly 1 is provided with a wire passing assembly 5 and an exhaust assembly 6. The wire passing assembly 5 is provided with a sealing structure for sealing the gaps in the wire harness. The exhaust assembly 6 is provided with a one-way ventilation structure. An air intake and air guide structure is provided between the air intake assembly 4 and the exhaust assembly 6. The terminal block 11 is located in the middle of the air intake and air guide structure.

[0027] The fixed housing assembly 1 is fixed on the external bracket, and the internal terminal block 11 is used for wiring. The movable housing assembly 2 is spliced ​​with the fixed housing assembly 1 through the connecting plate 3. The two connecting plates 3 are locked with bolts to realize the fixed connection between the movable housing assembly 2 and the fixed housing assembly 1. The movable housing assembly 2 can be easily removed from the fixed housing assembly 1, which is convenient for staff to maintain or inspect the inside of the terminal box.

[0028] like Figures 1 to 3 As shown, the connection between the fixed shell assembly 1 and the movable shell assembly 2 is a rectangular structure. The connecting plates 3 are inclined and distributed at the joint between the fixed shell 1 and the movable shell 2. The connecting plates 3 are distributed in pairs, and a sealing strip is provided between the two connecting plates 3. By splicing the two connecting plates 3 together, pressing the sealing strip between the two connecting plates 3, and then using bolts to fix the two connecting plates 3 together, a sealed connection between the fixed shell assembly 1 and the movable shell assembly 2 is achieved.

[0029] like Figure 2As shown, the air intake assembly 4 is located inside the opening at the bottom of the movable shell assembly 2. The air intake assembly 4 includes a grille plate 41 fixedly installed at the bottom of the opening and a multi-layer filter cloth structure arranged above the grille plate 41. Main pressure strips 45 are provided on the relatively inner sidewalls of the movable shell assembly 2 for the multi-layer filter cloth structure to be horizontally inserted. The multi-layer filter cloth structure is detachable. The main pressure strips 45 are used to press the multi-layer filter cloth structure, ensuring the stability of the installation. The grille plate 41 is located on the outermost side of the air intake, serving as a physical protective limit to prevent large debris such as stones, insects, and dead branches from entering the filter layer. It also provides support to the bottom of the three filter cloth layers, preventing the filter cloth from collapsing and deforming under the pressure of the airflow, thus ensuring a stable air intake flow area.

[0030] like Figure 2 As shown, the multi-layer filter cloth structure includes a primary filter cloth 42, a secondary filter cloth 43, and a fine filter cloth 44 arranged sequentially from bottom to top. The primary filter cloth 42 is a high-density PP polypropylene primary non-woven fabric, the secondary filter cloth 43 is made of glass fiber medium-efficiency filter cotton, and the secondary filter cloth 43 is filled with modified silica gel particles. The fine filter cloth 44 is made of ultra-fine fiber filter cloth, and a molecular sieve desiccant composite layer is provided inside the fine filter cloth 44.

[0031] The primary filter cloth 42 is used for the first layer of coarse filtration, trapping sand, dust, and large particles of dust. The PP material is resistant to outdoor moisture and mildew, has a large air permeability, and prioritizes the interception of large impurities, protecting the upper middle and fine filter structures from rapid clogging and extending the service life of the downstream filter media.

[0032] The middle filter cloth 43 is used to capture fine-particle floating dust and complete the secondary fine dust removal. The modified silica gel particles built into the middle filter cloth 43 rely on the porous adsorption characteristics to adsorb free water vapor in the air, initially reduce the humidity of the air intake, share the terminal dehumidification load, and realize the integration of dust removal and primary dehumidification.

[0033] The fine filter cloth 44 is used to trap micron-level fine dust and complete the terminal fine filtration; the molecular sieve composite layer deeply adsorbs residual water vapor, further reducing the moisture content of the intake air, and finally achieving low dust and low humidity in the air entering the box, reducing condensation and dust accumulation in the box from the source of air intake.

[0034] like Figure 2 As shown, the length of the fine filter cloth 44 is greater than the length of the intermediate filter cloth 43 and the primary filter cloth 42. The movable shell assembly 2 is provided with three pairs of main pressure strips 45 corresponding to the primary filter cloth 42, the intermediate filter cloth 43 and the fine filter cloth 44 respectively. The fine filter cloth 44 covers both ends of the primary filter cloth 43 and the intermediate filter cloth 43. The movable shell assembly 2 is provided with a tail pressure strip 46 on the side away from the main pressure strips 45. A gap is provided between the tail pressure strip 46 and the bottom of the movable shell assembly 2 for the movable end of the fine filter cloth 44 to be inserted.

[0035] Three pairs of main pressure strips 45 are set on both sides inside the movable housing 2. The gaps between the main pressure strips 45 and between the main pressure strips 45 and the bottom of the movable housing 2 are used for sliding insertion of the primary filter cloth 42, the middle filter cloth 43 and the fine filter cloth 44, respectively. This realizes the replaceable installation of the multi-layer filter cloth structure. Moreover, the setting of the tail pressure strip 46 makes the installation of the outermost fine filter cloth 44 more stable. The fine filter cloth 44 presses down the middle filter cloth 43 and the primary filter cloth 42 to ensure the quality of intake air filtration.

[0036] like Figure 2 and Figure 3 As shown, the air intake and air guiding structure includes an air guide plate 21 fixedly installed in the middle of the movable shell assembly 2. The air guide plate 21 is inclined and the bottom end of the air guide plate 21 is located directly above the air intake assembly 4. A heating fan 13 is provided on one side of the top of the air guide plate 21. The heating fan 13 is arranged vertically. An exhaust fan 61 is provided on the inner side of the exhaust assembly 6. The exhaust fan 61 is located directly above the heating fan 13.

[0037] When ventilating the terminal box to reduce its internal temperature, outside air enters the terminal box through the air intake assembly 4. Under the action of the air guide plate 21, and in conjunction with the heating fan 13, the airflow is directed towards the terminal block 11. Then, the exhaust fan 61 draws the airflow from the terminal block 11 out through the exhaust assembly 6. A heater 12 is also installed above the heating fan 13. The heating fan 13, in conjunction with the heater 12, outputs heated gas to the terminal block 11, increasing the air's heat output and moisture-carrying capacity, thus directing the moisture inside the terminal box outwards.

[0038] like Figure 1 , Figure 3 and Figure 5 As shown, the cable guide assembly 5 includes a cable guide box 52 fixed to the side wall of the movable housing assembly 2. A protective cover 51 is fixedly installed on the outer side wall of the movable housing assembly 2 to block the entrance of the cable guide box 52. The sealing structure is disposed inside the cable guide box 52. The protective cover 51 can prevent rainwater and sand from directly affecting the cable guide box 52. The wire harness enters and exits the terminal box through the cable guide box 52. The sealing structure seals the wire harness and the cable guide box 52, improving the sealing performance of the terminal box.

[0039] like Figure 5 and Figure 6As shown, the sealing structure includes a wire pass sleeve 53 fixed to the wire pass box 52 and a pressure ring 55 threaded to the outer end of the wire pass sleeve 53. Both the wire pass sleeve 53 and the pressure ring 55 are annular. A sealing ring 54 is embedded inside the wire pass sleeve 53. The wire pass sleeves 53 are arranged in an array within the wire pass box 52. The wire pass sleeve 53 is fixedly installed, and the wire harness passes through the wire pass sleeve 53 and the pressure ring 55. By tightening the pressure ring 55 to the end of the wire pass sleeve 53, the sealing ring 54 is compressed during the tightening process. The sealing ring 54 fills the gap between the wire pass sleeve 53 and the wire harness, improving the sealing performance.

[0040] like Figure 3 and Figure 4 As shown, the exhaust structure 6 includes a pressure platform 64 fixed to the inner wall of the fixed housing assembly 1, a plug-in box 65 with a sliding sleeve fitted to the end of the pressure platform 64, and a mounting base plate 62 fixed to the plug-in box 65. The mounting base plate 62 is fixedly connected to the fixed housing assembly 1 by locking bolts 66. A one-way breathable membrane 67 is provided between the pressure platform 64 and the mounting base plate 62. A connecting platform 63 is fixed on the mounting base plate 62, and the output end of the air intake and air guide structure is connected to the connecting platform 63. An exhaust fan 61 is installed on the connecting platform 63. The exhaust fan 61 draws the airflow directly out through the inner side of the connecting platform 63, and discharges it through the array holes on the mounting base plate 62, the one-way breathable membrane 67, and the pressure platform 64. When fixing the one-way breathable membrane 67, the one-way breathable membrane 67 is laid flat inside the plug box 65, the plug box 65 is fitted onto the end of the pressure table 64, and the plug box 65 is locked with the locking bolt 66. The pressure table 64 and the mounting base plate 62 cooperate to fix the one-way breathable membrane 67.

[0041] like Figure 4 As shown, the movable end of the pressure platform 64 is provided with a U-shaped protruding structure. The outer wall of the protruding structure is fitted with the inner wall of the insertion box 65, and the edge of the one-way breathable membrane 67 is fitted with the inner wall of the insertion box 65. By providing the protruding structure, the edge of the one-way breathable membrane 67 is stably clamped, further improving the stability of the installation of the one-way breathable membrane 67.

Claims

1. An outdoor switch auxiliary terminal box, characterized in that: It includes a fixed shell assembly (1) fixedly mounted on an external bracket and a movable shell assembly (2) detachably connected to the bottom of the fixed shell assembly (1) via a connecting plate (3). The bottom of the movable shell assembly (2) is provided with an air intake assembly (4) for dust removal and moisture absorption of the air. The side wall of the fixed shell assembly (1) is provided with a wire passing assembly (5) and an exhaust assembly (6). The wire passing assembly (5) is provided with a sealing structure for sealing the gap of the wire harness. The exhaust assembly (6) is provided with a one-way ventilation structure. An air intake and air guide structure is provided between the air intake assembly (4) and the exhaust assembly (6). The terminal block (11) is located in the middle of the air intake and air guide structure.

2. The outdoor switch auxiliary terminal box as described in claim 1, characterized in that: The connection between the fixed shell assembly (1) and the movable shell assembly (2) is rectangular in shape. The connecting plate (3) is inclined and distributed at the joint between the fixed shell (1) and the movable shell (2). The connecting plates (3) are distributed in pairs, and a sealing strip is provided between the two connecting plates (3).

3. The outdoor switch auxiliary terminal box as described in claim 1, characterized in that: The air intake assembly (4) is located in the opening at the bottom of the movable shell assembly (2). The air intake assembly (4) includes a grille plate (41) fixedly installed at the bottom of the opening and a multi-layer filter cloth structure arranged above the grille plate (41). The inner walls of the movable shell assembly (2) are provided with main pressure strips (45) for the multi-layer filter cloth structure to be horizontally inserted.

4. The outdoor switch auxiliary terminal box as described in claim 3, characterized in that: The multi-layer filter cloth structure includes a primary filter cloth (42), a secondary filter cloth (43), and a fine filter cloth (44) arranged sequentially from bottom to top. The primary filter cloth (42) is a high-density PP polypropylene primary non-woven fabric, the secondary filter cloth (43) is made of glass fiber medium-efficiency filter cotton, and the secondary filter cloth (43) is filled with modified silica gel particles. The fine filter cloth (44) is made of ultra-fine fiber filter cloth, and the fine filter cloth (44) is provided with a molecular sieve desiccant composite layer.

5. The outdoor switch auxiliary terminal box as described in claim 4, characterized in that: The length of the fine filter cloth (44) is greater than the length of the medium filter cloth (43) and the primary filter cloth (42). The movable shell assembly (2) is provided with three pairs of main pressure strips (45) corresponding to the primary filter cloth (42), the medium filter cloth (43) and the fine filter cloth (44) respectively. The fine filter cloth (44) covers both ends of the primary filter cloth (43) and the medium filter cloth (43). The movable shell assembly (2) is provided with a tail pressure strip (46) on the side away from the main pressure strips (45). A gap is provided between the tail pressure strip (46) and the bottom of the movable shell assembly (2) for the movable end of the fine filter cloth (44) to be inserted.

6. The outdoor switch auxiliary terminal box as described in claim 1, characterized in that: The air intake and air guiding structure includes an air guide plate (21) fixedly installed in the middle of the movable shell assembly (2). The air guide plate (21) is inclined and the bottom end of the air guide plate (21) is located directly above the air intake assembly (4). A heating fan (13) is provided on one side of the top of the air guide plate (21). The heating fan (13) is arranged vertically. An exhaust fan (61) is provided on the inner side of the exhaust assembly (6). The exhaust fan (61) is located directly above the heating fan (13).

7. The outdoor switch auxiliary terminal box as described in claim 1, characterized in that: The cable guide assembly (5) includes a cable guide box (52) fixed to the side wall of the movable housing assembly (2). A protective cover (51) that blocks the entrance of the cable guide box (52) is fixedly provided on the outer side wall of the movable housing assembly (2). The sealing structure is provided inside the cable guide box (52).

8. The outdoor switch auxiliary terminal box as described in claim 7, characterized in that: The sealing structure includes a wire sleeve (53) fixed on the wire pass box (52) and a pressure ring (55) threaded to the outer end of the wire sleeve (53). Both the wire sleeve (53) and the pressure ring (55) are annular. A sealing ring (54) is embedded in the inner side of the wire sleeve (53). The wire sleeves (53) are arranged in an array inside the wire pass box (52).

9. The outdoor switch auxiliary terminal box as described in claim 1, characterized in that: The exhaust structure (6) includes a pressure plate (64) fixed to the inner wall of the fixed shell assembly (1), a plug box (65) with a sliding sleeve fitted on the end of the pressure plate (64), and a mounting base plate (62) fixed on the plug box (65). The mounting base plate (62) is fixedly connected to the fixed shell assembly (1) by locking bolts (66). A one-way breathable membrane (67) is provided between the pressure plate (64) and the mounting base plate (62). A connecting platform (63) is fixed on the mounting base plate (62). The output end of the air duct and air guiding structure is connected to the connecting platform (63).

10. The outdoor switch auxiliary terminal box as described in claim 9, characterized in that: The movable end of the pressure table (64) is provided with a U-shaped convex structure. The outer side wall of the convex structure is attached to the inner side wall of the plug box (65), and the edge of the one-way breathable membrane (67) is attached to the inner side wall of the plug box (65).

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