Lightweight high-protection intelligent outdoor distribution box

Abstract

The invention relates to a lightweight high-protection intelligent outdoor distribution box, and relates to the field of electrical equipment protection, the distribution box comprises a box body, the side wall of the box body is provided with an intelligent protection system, the system comprises a main airflow channel and an independent bypass channel, and the main airflow channel is sequentially provided with an explosion-proof protection module and a temperature control ventilation module. The independent bypass channel is provided with an air pressure balance module, the on-off state of each module responds to the temperature and pressure change inside and outside the box body, automatic switching of multiple working modes of closed moisture prevention, ventilation heat dissipation and closed explosion prevention is achieved, and the specific structure and working principle of each module are set in detail. For example, honeycomb holes and deformation grooves of the explosion-proof protection module are designed. The power distribution box achieves the technical effects of realizing automatic switching of multiple protection functions of the power distribution box, adapting to different environmental conditions and effectively protecting the electrical equipment.

Description

TECHNICAL FIELD

[0001] The application relates to the field of electrical equipment protection, in particular to a light-weight high-protection intelligent outdoor distribution box. BACKGROUND

[0002] As a key device for power distribution, the protection performance of the light-weight high-protection intelligent outdoor distribution box directly affects the stability and safety of the power system. With the continuous development and upgrading of the power system, the performance requirements of the outdoor distribution box are also increasing. The traditional design of the outdoor distribution box has been difficult to meet the demand of modern power systems for efficient, safe and reliable operation. In recent years, the outdoor distribution box has developed in terms of materials, structure and function. In terms of materials, it has gradually developed from single metal materials to the use of composite materials, which has improved some performance of the distribution box. In terms of structural design, there have also been some optimizations, such as the addition of ventilation openings. These improvements have improved the performance of the outdoor distribution box to some extent, but there is still a lot of room for improvement in overall protection and intelligent regulation.

[0003] In related technologies, in order to solve the problems of protection and heat dissipation of outdoor distribution boxes, various means are usually adopted. For protection, traditional distribution boxes are usually made of metal materials (such as steel plates and aluminum alloys) to resist external impact and damage through the mechanical strength of the metal. Some distribution boxes will be subjected to corrosion prevention treatment on the surface to prolong the service life. In terms of heat dissipation, the common methods are natural ventilation or the installation of simple fans. Natural ventilation is to open ventilation openings on the box body to use the natural flow of air to remove heat, while simple fans are driven by electricity to accelerate the flow of air and enhance the heat dissipation effect. For moisture and explosion protection, some distribution boxes will adopt a sealed design to prevent the intrusion of moisture and explosion hazards, but this method often affects the heat dissipation performance. In addition, in terms of pressure balance, the existing technology lacks an effective automatic adjustment mechanism, making it difficult to cope with problems caused by changes in the pressure inside and outside the box.

[0004] However, although the composite material distribution box has certain advantages in terms of lightweight, it still has deficiencies in terms of impact resistance, sealing and intelligent monitoring. The existing heat dissipation design cannot balance the contradiction between heat dissipation and dust and water prevention, and natural ventilation is not effective when the ambient temperature is high or the ventilation conditions are poor, while simple fans require additional power supply and are easily damaged in harsh environments. At the same time, the existing distribution box lacks the ability to automatically adjust the working mode according to the temperature and pressure changes inside and outside the box, and cannot realize the automatic switching of multiple working modes such as closed moisture-proof, ventilation and heat dissipation, and closed explosion-proof, making it difficult to meet the requirements of modern power systems for high protection and intelligence of outdoor distribution boxes. SUMMARY

[0005] The application aims to overcome the above technical problems and provides a lightweight high-protection intelligent outdoor distribution box.

[0006] The application aims to overcome the above technical problems and provides a lightweight high-protection intelligent outdoor distribution box. The main airflow channel is sequentially provided with an explosion-proof protection module mounted through a first frame and a temperature control ventilation module mounted through a second frame from outside to inside; The independent bypass channel is provided with an air pressure balancing module mounted through a valve body; The opening and closing states of the explosion-proof protection module, the temperature control ventilation module and the air pressure balancing module are configured to respond to the temperature and pressure changes inside and outside the box body, so as to realize automatic switching of multiple working modes such as airtight moisture-proof, ventilation and heat dissipation, and airtight explosion-proof.

[0007] By adopting the above technical solution, the intelligent protection system of the "main-bypass" double-channel cooperation is established, the decoupling and cooperation in function are realized, the main channel is responsible for large wind volume heat dissipation and basic protection, the bypass channel is responsible for precise pressure fine adjustment and preliminary heat dissipation, and the two intelligently allocate tasks according to the working conditions, thereby fundamentally solving the inherent contradiction between "sealing", "heat dissipation" and "explosion-proof" of the traditional box body from the system level.

[0008] Optionally, the explosion-proof protection module comprises a base body, the base body is provided with a rib formed by a hexagonal honeycomb hole, a deformation groove is formed in the surface of the rib facing the inside of the box body, and the size of the honeycomb hole in the central region of the base body is smaller than the size of the honeycomb hole in the edge region.

[0009] By adopting the above technical solution, the hexagonal honeycomb hole can provide the largest coverage area and the highest structural stability with the least material, and the impact load received can be uniformly dispersed to the entire base body, avoiding local stress concentration and premature tearing; the design of the deformation groove can guide the rib to twist and hook with each other when impacted, thereby more effectively plugging the channel; the gradient design of the honeycomb hole with a smaller size in the central region and a larger size in the edge region enables the center to cope with the strongest impact, and the edge region can be deformed at a lower pressure to assist in completing the overall locking.

[0010] Optionally, the temperature control ventilation module comprises: a bimetallic temperature sensor; a drive rod, wherein the middle part is rotationally connected to the box body through a rotating shaft, and one end is in contact or hinged with the free end of the bimetallic temperature sensor; a transmission rod, one end of which is hinged with the other end of the drive rod; a plurality of airfoil blades, which are rotationally connected in the second frame through rotating shafts; wherein the other end of the transmission rod is linked with the airfoil blades to convert the rotation of the drive rod into the synchronous opening and closing movement of the airfoil blades.

[0011] By adopting the technical scheme, a pure mechanical and passive lever transmission system is constructed, small deformation of the bimetallic temperature sensor is accurately and reliably amplified and converted into control force of multiple louver blades, direct and synchronous conversion from a thermal signal to mechanical movement is realized, and a basic execution mechanism is provided for intelligent temperature control.

[0012] Optionally, the temperature control ventilation module further comprises an overpressure protection mechanism, which comprises: a pressure bearing plate exposed to the internal environment of the cabinet; a second sliding block having one end connected with the pressure bearing plate and the other end provided with a second driving slope; a first sliding block connected with the bimetallic temperature sensor and provided with a first driving slope matched with the second driving slope; wherein the pressure bearing plate is driven by overpressure in the cabinet, and can drive the bimetallic temperature sensor and the connecting rod transmission mechanism to move through the slope matching of the second sliding block and the first sliding block, so as to force the wing-shaped blades to close.

[0013] By adopting the technical scheme, the pressure bearing plate of the overpressure protection mechanism is driven by overpressure in the cabinet, and the bimetallic temperature sensor and the connecting rod transmission mechanism are driven to move through the slope matching of the second sliding block and the first sliding block, so as to force the wing-shaped blades to close, thereby providing a mechanical emergency braking function based on pressure independent of temperature control, and cooperating with the explosion-proof module to improve the response speed and reliability of the system to sudden failures.

[0014] Optionally, a driving groove is formed on the wing-shaped blade, and the transmission rod extends into the driving groove through a sliding connection part, and when the transmission rod moves, the sliding connection part slides along the driving groove and drives the blade to rotate around its rotating shaft.

[0015] By adopting the technical scheme, the temperature control ventilation module converts the rotation of the driving rod into synchronous opening and closing movement of the wing-shaped blades through the bimetallic temperature sensor, the driving rod, the transmission rod and the wing-shaped blades, a driving groove is formed on the wing-shaped blade, and the transmission rod extends into the driving groove through a sliding connection part, so that the linear motion of the transmission rod can be efficiently converted into the rotary motion of the blade, and the synchronism of the opening and closing actions of all wing-shaped blades is ensured.

[0016] Optionally, the air pressure balance module comprises: a valve seat fixed in the valve body, an annular pressure equalizing groove is formed on the sealing end face of the valve seat, and a pressure equalizing hole is formed at the bottom of the groove; a valve core comprising a heat conducting rod part and a sealing plate part covered with elastic sealing material; a shape memory alloy spring connected between the valve core and the adjusting sleeve; wherein the shape memory alloy spring is configured to generate a contraction force when the temperature rises, and assists in driving the valve core to separate from the valve seat to open the air flow channel.

[0017] By adopting the technical scheme, the annular pressure equalizing groove and the pressure equalizing hole form a stable pressure cavity when the gas flow passes through the annular groove, so that the local pressure is uniform, and the pressure equalizing hole makes the pressure on both sides of the valve core more balanced, thereby avoiding high-frequency flutter of the valve core; the shape memory alloy spring generates a contraction force when the temperature rises, which assists in driving the valve core to separate from the valve seat to open the gas flow passage, so that it becomes a secondary ventilation passage directly driven by the temperature, and intelligent positive feedback of "temperature rise-ventilation enhancement" is realized, thereby forming a gradient heat dissipation with the main ventilation passage.

[0018] Optionally, the adjusting sleeve is threadedly connected with the valve body, and the pre-compression amount of the shape memory alloy spring can be adjusted by rotating the adjusting sleeve, so that the reference opening pressure of the gas pressure balance module is set.

[0019] By adopting the technical scheme, the pre-compression amount of the shape memory alloy spring can be adjusted by rotating the adjusting sleeve threadedly connected with the valve body, and the reference opening pressure of the gas pressure balance module at different temperatures is customized, thereby greatly improving the environmental adaptability and universality of the product, and meeting the needs of different regions and different sealing grade boxes.

[0020] Optionally, the trigger temperature of the bimetallic temperature sensor is higher than the austenite phase transition completion temperature of the shape memory alloy spring, so that the gas pressure balance module opens earlier than the temperature control ventilation module during temperature rise.

[0021] By adopting the technical scheme, the gradient intelligent heat dissipation strategy of the system is defined, the gas pressure balance module opens first to provide preliminary heat dissipation when the temperature rises due to the phase transition of the shape memory alloy spring, the temperature control ventilation module opens to provide maximum air volume heat dissipation when the temperature continuously rises to the trigger point of the bimetallic temperature sensor, the abrupt switching of the heat dissipation mode is avoided, the temperature control process is smoother and more energy-saving, and the actions of the two modules do not interfere with each other.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. An intelligent protection system of "main-bypass" double-channel cooperation is established to realize automatic switching of multiple working modes such as sealed moisture-proof, ventilation and heat dissipation, and sealed explosion-proof, and solve the inherent contradiction between "sealing", "heat dissipation" and "explosion-proof" of the traditional box; 2. The deformation groove of the explosion-proof protection module is directionally designed to make the grid rib controllable deformation to form a blocking barrier, the gradient density design realizes the optimal balance of material efficiency and impact resistance, and improves the explosion-proof reliability and realizes the light weight; 3. The temperature control ventilation module constructs a pure mechanical and passive lever transmission system, which directly and synchronously converts the heat signal into mechanical movement to provide a basic execution mechanism for intelligent temperature control; 4. The driving groove on the airfoil blade converts the linear motion of the transmission rod into the rotary motion of the blade, ensures the synchronous opening and closing of the blade, and improves the sealing performance in the closed state; 5. The overvoltage protection mechanism provides a pressure-based mechanical emergency braking function, which is linked with the explosion-proof module to improve the response speed and reliability of the system to sudden failures; 6. The air pressure balancing module uses the active contraction effect of shape memory alloy springs to form a secondary ventilation channel, which forms a gradient heat dissipation with the main ventilation channel, realizing the intelligent positive feedback of "temperature rise-ventilation enhancement"; 7. The reference opening pressure of the air pressure balancing module can be accurately calibrated by adjusting the sleeve, improving the environmental adaptability and versatility of the product; 8. The bimetallic temperature sensor cooperates with the shape memory alloy spring to set the trigger temperature, realizing a gradient intelligent heat dissipation strategy, making the temperature control process smoother and energy-saving, and avoiding mutual interference of module actions. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the overall structure schematic diagram of the present application; Figure 2 is the structure schematic diagram of the present application, mainly embodying the temperature control ventilation module; Figure 3 is the structure schematic diagram of the present application, mainly embodying the second frame; Figure 4 is Figure 3 is the local enlarged schematic diagram of part A of Figure 5 is the exploded structure schematic diagram of the present application, mainly embodying the deformation groove; Figure 6 is the structure schematic diagram of the present application, mainly embodying the first slider and the second slider; Figure 7 is the structure schematic diagram of the present application, mainly embodying the blade, the transmission rod and the connecting rod; Figure 8 is Figure 7 is the local enlarged schematic diagram of part B of Figure 9 is the exploded structure schematic diagram of the present application, mainly embodying the valve core and the shape memory alloy spring.

[0024] BRIEF DESCRIPTION OF DRAWINGS: 1, box; 2, explosion-proof protection module; 201, base; 202, hole; 203, deformation groove; 3, temperature control ventilation module; 301, first sliding block; 302, first return spring; 303, bimetallic temperature sensor; 304, drive rod; 305, rotating shaft; 306, blade; 307, transmission rod; 308, connecting rod; 309, second sliding block; 310, pressure plate; 311, second return spring; 312, sealing strip; 4, air pressure balance module; 401, valve seat; 402, valve core; 402a, sealing plate part; 402b, heat conducting rod part; 403, fixed frame; 404, adjusting sleeve; 405, shape memory alloy spring; 5, main installation window; 6, first frame; 7, sealing ring; 8, second frame; 9, fixed block; 10, first installation slot; 11, first sliding slot; 12, pressure equalizing hole; 13, drive slot; 14, second installation slot; 15, secondary installation window; 16, valve body; 17, sealing ring; 18, annular pressure equalizing groove. DETAILED DESCRIPTION

[0025] The following will be described in detail in combination with the accompanying drawings Figure 1 - the accompanying drawings Figure 9 , the present application is further described in detail.

[0026] A lightweight high-protection intelligent outdoor distribution box, referring to Figure 1 , Figure 2 , comprising a box 1, the side wall of the box 1 is provided with an intelligent protection system, which comprises a main airflow channel and an independent bypass channel. The column airflow channel is provided with an explosion-proof protection module 2, a temperature control ventilation module 3 from outside to inside in turn, and the independent bypass channel is provided with an air pressure balance module 4. Among them, the opening and closing state of the explosion-proof protection module 2, the temperature control ventilation module 3 and the air pressure balance module 4 is configured to respond to the temperature and pressure changes inside and outside the box 1, realizing the automatic switching of multiple working modes.

[0027] Referring to Figure 3 , Figure 4 , the main installation window 5 is opened on the side of the box 1, and the inner wall of the main installation window 5 is fixedly connected with the annular first frame 6 through screws, and the sealing ring 7 is fixedly connected at the connection between the first frame 6 and the inner wall of the main installation window 5, so as to avoid the leakage of the gas in the box 1 from the gap between the first frame 6 and the main installation window 5. The explosion-proof protection module 2 comprises a base 201 fixedly connected in the first frame 6, wherein a plurality of holes 202 are formed in the base 201, and the holes 202 are regular hexagonal honeycomb. The regular hexagonal honeycomb hole 202 can provide the maximum coverage area and the highest structural stability with the least material, and can uniformly disperse the impact load to the whole base 201, avoiding local stress concentration and premature tearing.

[0028] Referring to Figure 4 ,Figure 5 The side surface of the base 201 facing the inside of the box 1 is provided with a deformation groove 203, and the deformation groove 203 is provided on the rib surface formed by the adjacent two hexagonal honeycomb holes 202. In addition, the side wall between the deformation groove 203 and the hole 202 has an angle with the airflow direction, and the angle can be 45°. At the same time, the side wall between the deformation groove 203 and the hole 202 is along the hexagonal honeycomb fracture, so as to guide the ribs to twist and hook each other when impacted, so as to more effectively block the channel. The size of the hexagonal honeycomb hole 202 in the central region of the base 201 is smaller and the distribution is denser, and in the edge region, the size of the hole 202 is larger and the distribution is sparse. The intensity and speed of the shock wave generated by the internal explosion are the highest on the central axis of the channel, and decrease towards the surrounding. The gradient design makes the center resist the strongest impact, while the edge region can be deformed under lower pressure to assist the overall locking.

[0029] Referring to Figure 5 , Figure 6 The inner wall of the main mounting window 5 is fixedly connected with the second frame 8 through a screw, which is located on the side of the first frame 6 close to the inside of the box 1. The side wall of the second frame 8 is integrally formed with a fixing block 9, and the fixing block 9 is embedded in the inner wall of the box 1. A first mounting groove 10 is formed in the fixing block 9, and first sliding grooves 11 are formed in the inner walls on both sides of the first mounting groove 10. The temperature control ventilation module 3 comprises a first sliding block 301 slidably connected in the first mounting groove 10, and the upper and lower sides of the first sliding block 301 extend into the first sliding grooves 11 and are fixedly connected with the inner walls of the first sliding grooves 11 away from the second frame 8 through first return springs 302.

[0030] The side of the first sliding block 301 close to the second frame 8 is fixedly connected with a bimetallic temperature sensor 303, which is a strip-shaped element combined by two metal sheets with significantly different thermal expansion coefficients through metallurgical lamination. The end of the bimetallic temperature sensor 303 away from the first sliding block 301 is rotatably connected with a driving rod 304. At the same time, the fixing block 9 and the second frame 8 are provided with a clearance groove, and the inside of the second frame 8 and the first mounting groove 10 are communicated through the clearance groove, so that the driving rod 304 extends into the second frame 8 through the clearance groove. The driving rod 304 is composed of a long branch and a short branch, and the long branch and the short branch have an included angle, and the short branch is rotatably connected with the bimetallic temperature sensor 303. A rotating shaft 305 is fixedly connected at the connection between the long branch and the short branch, and the rotating shaft 305 is rotatably connected with the inner wall of the clearance groove.

[0031] Referring to Figure 6 , Figure 7 , Figure 8The second frame 8 is provided with a plurality of rotating shafts arranged in vertical direction on both sides thereof. The rotating shafts are fixedly connected with airfoil-shaped blades 306 having thin edges and curvature in the middle. The surfaces of the blades 306 are provided with nano-hydrophobic coating. The end of the long branch of the driving rod 304 is connected with a transmission rod 307 through a hinged rod, wherein the transmission rod 307 extends into the upper and lower inner walls of the second frame 8 and is in sliding connection with the second frame 8. Each blade 306 is provided with a driving groove 13, and the surface of the driving rod 304 is fixedly connected with a plurality of connecting rods 308 corresponding to the blades 306, wherein the connecting rods 308 extend into the driving grooves 13 of the corresponding blades 306 and slide along the inner walls of the driving grooves 13.

[0032] When the temperature of the box 1 rises, the bimetallic temperature sensor 303 is heated and shrinks, thereby controlling the driving rod 304 to push the transmission rod 307 to slide upward, so as to push the blades 306 to open upward, and the connecting rods 308 passively slide along the driving grooves 13 towards the rotating shafts.

[0033] Referring to Figure 5 , Figure 6 , the first mounting groove 10 is provided with a second mounting groove 14 on the side away from the second frame 8, and the first mounting groove 10 and the second mounting groove 14 are in communication. The second mounting groove 14 is in sliding connection with a second sliding block 309, and the bottom of the second mounting groove 14 is connected with the second sliding block 309 through a second return spring 311. In addition, the end face of the second sliding block 309 away from the bottom of the second mounting groove 14 is integrally formed with a pressure-bearing plate 310, which is in the shape of an umbrella and protrudes in an arc shape towards the second sliding block 309.

[0034] Referring to Figure 3 , Figure 6 , Figure 8 , the side of the second sliding block 309 close to the first sliding block 301 is provided with a second driving slope, and the side of the first sliding block 301 close to the second sliding block 309 is provided with a second driving slope matched with the first driving slope. When the internal pressure of the box 1 is too large, the pressure-bearing plate 310 pushes the second sliding block 309 to slide towards the bottom of the second mounting groove 14, and through the cooperation of the first driving slope and the second driving slope, the first sliding block 301 slides towards the second frame 8. Thus, the short stopper of the driving rod 304 rotates upward along the rotating shaft 305, and the long branch of the driving rod 304 pulls the transmission rod 307 to slide downward, causing the blades 306 to close. When the blades 306 are closed, the driving groove 13 of the upper blade 306 is in abutment with the surface of the blade 306 below it, so as to close the driving groove 13 itself. The lower side of the second frame 8 is fixedly connected with a sealing strip 312, and the lowermost blade 306 is in abutment with the sealing strip 312 when closed, so as to close the driving groove 13 itself.

[0035] Referring to Figure 3 , Figure 4 , the box 1 side is provided with a secondary installation window 15, the box 1 is fixedly connected with the valve body 16 through the secondary installation window 15, the connection between the valve body 16 and the secondary installation window 15 is provided with a sealing ring 17, so as to avoid the gas in the box, the outside environment from the gap of the valve body 16 and the secondary installation window 15. Among them, the valve body 16 is a hollow cylinder, both ends are provided with an interface connected with the box 1 and the external environment, and the inside is processed with a precise step and a hole, for accommodating other components.

[0036] Referring to Figure 4 , Figure 5 , Figure 9 , the air pressure balance module 4 includes an annular valve seat 401 fixedly connected in the valve body 16, and a gas flow channel is formed in the center thereof. The valve core 402 is slidably connected in the valve body 16, which is composed of a circular sealing plate part 402a and a heat conducting rod part 402b, and at the same time, a layer of elastic sealing material is coated on the surface of the sealing plate part 402a of the valve core 402. The sealing plate part 402a of the valve core 402 abuts against the valve seat 401 to form a sealing surface with the valve seat 401; the heat conducting rod part 402b of the valve core 402 is slidably connected with the fixed frame 403 in the valve body 16, so as to realize the sliding of the valve core 402 in the valve body 16. Among them, the fixed frame 403 is fixedly connected with the inner wall of the valve body 16 through a plurality of supports, and is coaxially arranged with the valve seat 401 and the valve body 16. In addition, the abutment between the valve seat 401 and the sealing plate part 402a is provided as a sealing surface, and the valve seat 401 is provided with an annular pressure equalizing groove 18 on the sealing surface, and a plurality of pressure equalizing holes 12 are formed in the groove bottom of the annular pressure equalizing groove 18. In this way, when the gas flows through, the annular groove forms a stable pressure chamber, so that the local pressure becomes uniform. Among them, the pressure equalizing holes 12 make the pressure acting on both sides of the valve core 402 more balanced, avoiding the high frequency vibration of the valve core 402 caused by gas flow pulsation or local high speed jet flow.

[0037] The adjusting sleeve 404 is threadedly connected to the side of the fixed frame 403 away from the valve seat 401, and is coaxially arranged with the valve seat 401. The opening of the adjusting sleeve 404 is arranged towards the valve seat 401, and the heat-conducting rod part 402b of the valve core 402 extends into the adjusting sleeve 404. Meanwhile, the adjusting sleeve 404 is fixedly connected with the shape memory alloy spring 405 at the bottom of the adjusting sleeve 404, and the adjusting sleeve 404 is fixedly connected with the valve core 402 through the shape memory alloy spring 405. The phase change characteristic of the SMA is utilized. At low temperature, the spring is relatively soft, and only a small internal and external pressure difference (such as 10-50 Pa) is needed to overcome the pre-tightening force, push away the valve core 402, balance the negative pressure generated due to cooling, and prevent the absorption of moisture. When the temperature in the box is high, the shape memory alloy spring 405 becomes stronger, and a larger internal and external pressure difference (such as 100-200 Pa) is needed to open the valve. In addition, the compression amount of the shape memory alloy spring 405 is accurately controlled through the adjusting sleeve 404, so as to set the opening pressure threshold of the valve, so as to adapt to the requirements of different box volumes, different sealing levels or different regional pressure fluctuation ranges.

[0038] In addition, the triggering temperature of the bimetallic temperature sensor 303 is higher than the triggering temperature of the shape memory alloy spring 405; when the temperature in the box is lower than the set threshold (the triggering temperature of the bimetallic temperature sensor 303), the system is in a closed and moisture-proof mode: the temperature control ventilation module is closed, and the airflow is mainly exchanged in a small amount through the air pressure balancing module 4; when the temperature in the box is higher than the set threshold, the system is in a ventilation and heat dissipation mode: the temperature control ventilation module 3 is opened to form a main airflow channel, and the air pressure balancing module 4 is in an auxiliary state; when a fault explosion occurs in the box, the system is in a closed and explosion-proof mode: the explosion-proof protection module 2 is programmed to be locked, and the temperature control ventilation module 3 and the air pressure balancing module 4 are synchronously closed.

[0039] The implementation principle of the embodiment of the application is that the system responds to environmental changes through a pure mechanical structure to realize intelligent operation.

[0040] At normal temperature or low temperature, the temperature in the box is low, the bimetallic temperature sensor 303 remains flat, the drive rod 304 drives the transmission rod 307 to maintain the blade 306 in the closed position. At this time, the main airflow channel is closed. The small pressure difference between the inside and outside of the box due to the diurnal temperature difference acts on the valve core 402 of the air pressure balancing module 4. Since the shape memory alloy spring 405 is in a relatively soft martensite state at this time, the pre-tightening force is small, the valve core 402 can be pushed away by a small pressure difference, a small amount of gas exchange is realized, the pressure is balanced, moisture absorption is prevented, and the system is in a closed and moisture-proof mode.

[0041] When the equipment in the box is running or the ambient temperature rises, the temperature first reaches the phase transition point of the shape memory alloy spring 405, increasing its stiffness, while the deformation of the shape memory alloy spring 405 gradually opens the air pressure valve, allowing the hot air in the box 1 to flow out through the independent bypass channel, at which time the system is in a first-stage ventilation cooling mode. If the temperature continues to rise to the trigger point of the bimetallic temperature sensor 303, its free end bends, pulling the drive rod 304 to rotate around the shaft, and then pushing all the airfoil blades 306 to rotate and open synchronously through the transmission rod 307. The main airflow channel is opened, and the external cold air is filtered through the explosion-proof grille, then flows through the airfoil blades 306 into the box for cooling, and the main airflow channel and the independent bypass channel cooperate to exhaust and cool the inside of the box 1, at which time the system is in a second-stage ventilation cooling mode.

[0042] When an arc fault occurs in the box, causing a sudden rise in pressure and temperature, the system enters a sealed explosion-proof mode. First, the huge shock wave acts on the explosion-proof grille, and the stress is concentrated at the deformation groove 203, guiding the ribs to twist and hook inward in a predetermined mode, achieving programmed locking. At the same time, the sudden increase in internal pressure presses the valve core 402 of the air pressure balance module 4 tightly against the valve seat 401, and the pressure pushes the pressure-bearing plate 310 to move the first sliding block 301 through the driving slope, instantly driving the transmission mechanism to force the already opened louvers to close. The three work together to physically isolate all channels within milliseconds, confining the danger inside the box.

[0043] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A lightweight, highly protected intelligent outdoor power distribution box, comprising a box body (1), characterized in that, An intelligent protection system is installed on the side wall of the enclosure (1), the system comprising: The main airflow channel is provided with an explosion-proof protection module (2) installed through the first frame (6) and a temperature control ventilation module (3) installed through the second frame (8) in sequence from the outside to the inside; An independent bypass channel is provided with a pressure balancing module (4) installed via a valve body (16); The opening and closing states of the explosion-proof protection module (2), temperature control ventilation module (3) and air pressure balance module (4) are configured to respond to the temperature and pressure changes inside and outside the enclosure (1), thereby realizing the automatic switching of multiple working modes such as airtight moisture protection, ventilation and heat dissipation and airtight explosion protection.

2. The lightweight, highly protective intelligent outdoor power distribution box according to claim 1, characterized in that, The explosion-proof protection module (2) includes a base (201), on which ribs formed by regular hexagonal honeycomb holes (202) are provided. Deformation grooves (203) are opened on one side surface of the ribs facing the inside of the box (1). The size of the honeycomb holes (202) in the central region of the base (201) is smaller than its size in the edge region.

3. The lightweight, highly protective intelligent outdoor power distribution box according to claim 1, characterized in that, The temperature control ventilation module (3) includes: Bimetallic temperature sensor (303); The drive rod (304) is rotatably connected to the housing (1) via a rotating shaft (305) at its middle part, and one end of it is in contact with or hinged to the free end of the bimetallic temperature sensor (303). The transmission rod (307) has one end hinged to the other end of the drive rod (304); Multiple airfoil blades (306) are rotatably connected to the second frame (8) via a rotating shaft; The other end of the transmission rod (307) is linked to the airfoil (306) to convert the rotation of the drive rod (304) into the synchronous opening and closing motion of the airfoil (306).

4. A lightweight, highly protective intelligent outdoor power distribution box according to claim 3, characterized in that, The temperature control ventilation module (3) also includes an overpressure protection mechanism, which includes: Pressure plate (310), which is exposed to the internal environment of the enclosure (1); The second slider (309) is connected at one end to the pressure plate (310) and at the other end is provided with a second driving inclined surface; The first slider (301) is connected to the bimetallic temperature sensor (303) and is provided with a first driving slope that cooperates with the second driving slope. The pressure plate (310) is driven by the overpressure inside the box and can drive the bimetallic temperature sensor (303) and the linkage transmission mechanism to move through the inclined surface cooperation of the second slider (309) and the first slider (301), thereby forcing the airfoil blade (306) to close.

5. A lightweight, highly protective intelligent outdoor power distribution box according to claim 3, characterized in that, The airfoil blade (306) has a drive groove (13), and the transmission rod (307) extends into the drive groove (13) through a sliding connection. When the transmission rod (307) moves, the sliding connection slides along the drive groove (13) and drives the blade (306) to rotate around its axis.

6. A lightweight, highly protective intelligent outdoor power distribution box according to claim 1, characterized in that, The pressure balancing module (4) includes: A valve seat (401) is fixed inside the valve body (16). An annular pressure equalization groove (18) is provided on the sealing end face of the valve seat (401), and a pressure equalization hole (12) is provided at the bottom of the groove. The valve core (402) includes a heat-conducting rod portion (402b) and a sealing plate portion (402a) covered with an elastic sealing material; A shape memory alloy spring (405) is connected between the valve core (402) and the adjusting sleeve (404); The shape memory alloy spring (405) is configured to generate a contraction force when the temperature rises, which helps drive the valve core (402) to disengage from the valve seat (401) to open the airflow passage.

7. A lightweight, highly protective intelligent outdoor power distribution box according to claim 6, characterized in that, The adjusting sleeve (404) is threadedly connected to the valve body (16). By rotating the adjusting sleeve (404), the pre-compression of the shape memory alloy spring (405) can be adjusted, thereby setting the reference opening pressure of the air pressure balance module (4).

8. A lightweight, highly protective intelligent outdoor power distribution box according to claim 1, characterized in that, The trigger temperature of the bimetallic temperature sensor (303) is higher than the austenitic phase transformation completion temperature of the shape memory alloy spring (405), so that the air pressure balance module (4) turns on before the temperature control ventilation module (3) during the temperature rise process.

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