Low-voltage cabinet for power equipment

Abstract

The invention belongs to the technical field of power equipment, and particularly provides a low-voltage cabinet for power equipment, which comprises a case, a first ventilation hole is formed in the case, a movable first ventilation baffle plate is arranged at the first ventilation hole, and a case door is arranged at an opening in one side of the case; a transition bin is arranged on the side, away from the box door, of the machine box, the transition bin communicates with the machine box through a second ventilation hole, a back plate is arranged on one side of the transition bin, a third ventilation hole is formed in the back plate, a movable second ventilation baffle is arranged at the third ventilation hole, an ePTFE film is arranged on the second ventilation baffle, and a variable-frequency centrifugal fan is arranged in the transition bin. An air guide hole connected with a micro air pump is further formed in the transition bin and communicated with the air guide channel, an air sealing hole is formed in the air guide channel located at the box door, a detection sensor is arranged at the box door, and the machine box is further provided with a temperature sensor and a dust detection sensor. The device can adapt to different working conditions and environment changes, can efficiently dissipate heat, and can effectively prevent dust and water.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a low-voltage switchgear for power equipment. Background Technology

[0002] Low-voltage switchgear is a common power distribution device in power systems, widely used in power plants, substations, industrial and mining enterprises, and other places for the distribution, control, and protection of electrical energy. Low-voltage switchgear typically houses various electrical components such as transformers, switching devices, and busbars. These components generate a significant amount of heat during operation. If this heat cannot be dissipated effectively and promptly, the internal temperature of the switchgear can become excessively high, affecting the operating efficiency and safety of the electrical equipment, and even causing equipment failure or fire accidents.

[0003] To address heat dissipation issues, traditional low-voltage switchgear typically employs ventilation openings on the cabinet to utilize natural convection for cooling. However, this simple ventilation design suffers from limitations in its reliance on a single, uncontrollable cooling method. Natural ventilation alone offers limited efficiency and is insufficient to handle the substantial heat generated during high-load operation or in high-temperature environments. Furthermore, the ventilation openings are usually kept open, preventing flexible adjustments based on actual needs such as internal temperature and external environmental conditions, leading to either ineffective cooling or excessive protection.

[0004] Meanwhile, opening the cabinet door can easily introduce dust. When the internal temperature of the low-pressure cabinet is high, hot air accumulates at the top. If the cabinet door is opened at this time, the hot air rushes out rapidly, causing the internal pressure to drop instantly and creating a negative pressure. The denser cold air from the outside will then rush in violently from the cabinet door, bringing dust from the surrounding environment into the cabinet, causing contamination and damage to the precision equipment inside. Summary of the Invention

[0005] To address the aforementioned shortcomings, this invention provides a low-voltage switchgear for power equipment that can efficiently dissipate heat, effectively prevent dust and water damage, and adapt to different operating conditions and environmental changes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a low-voltage switchgear for power equipment, including a chassis, wherein first ventilation holes are provided on both sides of the chassis, and a movable first ventilation baffle is provided inside the chassis corresponding to the position of the first ventilation holes. The first ventilation baffle is provided with a first baffle hole that cooperates with the first ventilation holes, and a door is provided on one side of the chassis. A transition compartment is provided on the side of the chassis away from the door. The transition compartment is connected to the chassis through a second ventilation hole. A back panel is provided on the side of the transition compartment away from the chassis. A third ventilation hole is provided on the back panel. A movable second ventilation baffle is provided at the third ventilation hole inside the transition compartment. The second ventilation baffle has baffle holes that match the third ventilation hole. The second ventilation baffle includes a front cover plate and a rear cover plate. An ePTFE membrane is provided between the front cover plate and the rear cover plate. The transition chamber is equipped with a variable frequency centrifugal fan and an air duct. A miniature air pump is installed at the air duct. The air duct is connected to the air duct inside the chassis. The end of the air duct is arranged along the door and has several air seal holes. A detection sensor for detecting whether the door is open is installed at the door inside the chassis. Temperature sensors and dust detection sensors are installed inside and outside the chassis, respectively.

[0007] As a further improvement of the present invention, the first ventilation baffle is moved by a first driving mechanism. The first driving mechanism includes a first connecting plate and a second connecting plate respectively fixedly connected to the upper and lower sides of the first ventilation baffle. A first connecting block and a second connecting block are respectively provided on the side of the first connecting plate and the second connecting plate away from the first ventilation baffle. The first connecting block and the second connecting block are respectively fixedly connected to a first fixing plate and a second fixing plate. The first fixing plate and the second fixing plate are respectively fixedly connected to the sliders of the first linear module and the second linear module. The first linear module and the second linear module are both fixedly connected inside the chassis.

[0008] As a further improvement of the present invention, the front cover plate of the second ventilation baffle has a groove on the side near the back plate, and a rear cover plate is fitted in the groove. A threaded hole is provided at the bottom of the groove, and a countersunk hole matching the threaded hole is provided on the side of the rear cover plate away from the front cover plate. The rear cover plate and the front cover plate are fixedly connected by countersunk screws passing through the countersunk hole and the threaded hole. The ePTFE film is clamped between the front cover plate and the rear cover plate.

[0009] As a further improvement of the present invention, a third baffle hole matching the third ventilation hole is provided on the rear cover plate, and a second baffle hole matching the third baffle hole is provided on the front cover plate.

[0010] As a further improvement of the present invention, the second ventilation baffle is moved by a second driving mechanism. The second driving mechanism includes third connecting plates that are respectively fixedly connected to both sides of the second ventilation baffle. The ends of the two third connecting plates are fixedly connected to third connecting blocks. The third connecting blocks are fixedly connected to third fixing plates by bolts. The third fixing plates are fixedly connected to the slider of the third linear module. The third linear module is fixedly connected to the side plate of the transition chamber.

[0011] As a further improvement of the present invention, the air guide extends vertically upward to the top of the chassis to form a first section, the air guide bends vertically to connect to one side of the chassis door to form a second section, the air guide splits to both sides at the chassis door to form a third section along the top and sides of the chassis door, and the air seal hole is opened on the third section.

[0012] As a further improvement of the present invention, the top and sides of the door are covered with air-sealing holes when the door is closed.

[0013] As a further improvement of the present invention, a rainproof plate is provided on the top of the box door.

[0014] The beneficial effects of this invention are: 1. By monitoring the internal and external environment in real time through temperature and dust sensors, and combining movable ventilation baffles with a variable frequency centrifugal fan, intelligent switching of heat dissipation modes is achieved. When the external environment is clean and the internal temperature is normal, only the first ventilation opening is opened for natural ventilation; when the internal temperature is high but the external environment is clean, both natural ventilation and active air intake by the centrifugal fan are activated simultaneously, forming dual heat dissipation, which greatly improves heat dissipation efficiency and ensures stable operation of the equipment under high temperature and high load conditions.

[0015] 2. A combined second baffle is installed inside the transition chamber, and its opening and closing are controlled by a third linear module. When the external dust concentration is high, the first vent closes, and air enters only through the third vent. The ePTFE membrane sandwiched between the front and rear covers efficiently filters the intake air, effectively preventing dust and moisture from entering the chassis. The waterproof and dustproof properties of the ePTFE membrane, combined with the split baffle structure, ensures both filtration effectiveness and easy membrane removal and replacement.

[0016] 3. By incorporating a miniature air pump, air ducts, and air-sealing holes arranged along the top and sides of the cabinet door, and in conjunction with detection sensors, the low-pressure cabinet of this application can instantly activate the air-sealing system when it detects that the cabinet door is about to open. The airflow discharged from the air-sealing holes forms a dynamic gas barrier at the gap in the cabinet door, effectively preventing the problem of dust rushing in due to the negative pressure caused by the outflow of hot air and the replenishment of cold air inside the cabinet, thus greatly protecting the cleanliness and safety of the equipment inside the cabinet. Attached Figure Description

[0017] Figure 1 This is the first isometric view of the low-voltage switchgear for power equipment of the present invention; Figure 2 This is the first schematic diagram of the internal structure of the chassis; Figure 3 This is the second schematic diagram of the internal structure of the chassis; Figure 4 This is the second isometric view of the low-voltage switchgear for power equipment of the present invention; Figure 5 This is a schematic diagram of the internal structure of a low-voltage switchgear for power equipment; Figure 6 This is a schematic diagram of the internal structure of the transition chamber.

[0018] In the diagram: 1-Chassis, 2-Rainproof plate, 3-Chassis door, 4-First ventilation hole, 5-Dust detection sensor, 6-First linear module, 7-First fixing plate, 8-First connecting block, 9-Second connecting block, 10-Second fixing plate, 11-Second linear module, 12-Second ventilation hole, 13-Air duct, 14-Temperature sensor, 15-First connecting plate, 16-First ventilation baffle, 17-First baffle hole, 18-Second connecting plate, 19-Air seal hole, 20-Transition chamber, 21-Miniature air pump, 22-Air duct, 23-Back plate, 24-Rear cover plate, 240-Third baffle hole, 241-Counterhead hole, 25-Front cover plate, 250-Panel groove, 26-Variable frequency centrifugal fan, 27-Third ventilation hole, 28-Third linear module, 29-Third fixing plate, 30-Detection sensor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific examples described herein are merely illustrative and not intended to limit the invention. The directional terms used in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention. Furthermore, in all embodiments, the same reference numerals denote the same elements.

[0020] Please see Figures 1 to 6 The present invention provides a low-voltage switchgear for power equipment, including a chassis 1, and a triangular rainproof plate 2 is provided on the top of the chassis 1.

[0021] As a further explanation of this embodiment, the rainproof plate 2 can cover the top of the ventilation hole of the chassis 1 to prevent water from entering and to prevent water from accumulating on its top.

[0022] Both sides of the chassis 1 are provided with first ventilation openings, each of which consists of several straight groove-shaped first ventilation holes 4. A first ventilation baffle 16 is provided at the first ventilation opening inside the chassis 1. The first ventilation baffle 16 fits into the interior of the chassis 1, and the first ventilation baffle 16 has first baffle holes 17 that mate with the first ventilation holes 4.

[0023] A first connecting plate 15 and a second connecting plate 18 are fixedly connected to the top and bottom of the first ventilation baffle 16, respectively. A first connecting block 8 is fixedly connected to the top of the first connecting plate 15, and the first connecting block 8 has a threaded hole. A first fixing plate 7 is provided at the end of the first connecting block 8 away from the side panel of the chassis 1, and the first fixing plate 7 is fixedly connected to the first connecting block 8 by bolts. The end of the first fixing plate 7 away from the first connecting block 8 is fixedly connected to the slider of the first linear module 6, and the first linear module 6 is fixedly connected inside the chassis 1.

[0024] A second connecting block 9 is fixedly connected to the bottom of the second connecting plate 18, and the second connecting block 9 has a threaded hole. A second fixing plate 10 is provided at the end of the second connecting block 9 away from the side plate of the chassis 1, and the second fixing plate 10 is fixedly connected to the second connecting block 9 by bolts. The end of the second fixing plate 10 away from the second connecting block 9 is fixedly connected to the slider of the second linear module 11, and the second linear module 11 is fixedly connected inside the chassis 1.

[0025] As a further explanation of this embodiment, when the first ventilation hole 4 is in the open state, the sliders of the first linear module 6 and the second linear module 11 move, causing the first connecting plate 15 and the second connecting plate 18 to move, so that the first baffle hole 17 on the first ventilation baffle 16 and the first ventilation hole 4 form a matching state, and external air can enter the inside of the chassis 1 to achieve heat dissipation. When the first ventilation hole 4 is closed, the sliders of the first linear module 6 and the second linear module 11 move, causing the first connecting plate 15 and the second connecting plate 18 to shift, so that the first baffle hole 17 and the first ventilation hole 4 are misaligned. That is, the non-opening area of ​​the first ventilation baffle 16 blocks the first ventilation hole 4, blocking the gas exchange between the inside and outside of the chassis 1 and stopping heat dissipation.

[0026] An opening is provided on one side of the chassis 1, and a door 3 is provided at the opening. The door 3 adopts an embedded double door structure.

[0027] A transition compartment 20 is provided on the side of the chassis 1 away from the door 3. The transition compartment 20 is fixedly connected to the back of the chassis 1. The transition compartment 20 and the chassis 1 are connected by a number of second ventilation holes 12 opened between them.

[0028] The side of the transition chamber 20 furthest from the chassis 1 is covered by a back panel 23, which is fixedly connected by bolts. Several third ventilation holes 27 are provided on the back panel 23. A second ventilation baffle is provided at each of the third ventilation holes 27 inside the transition chamber 20. The second ventilation baffle is a modular structure.

[0029] The second ventilation baffle includes a front cover plate 25 and a rear cover plate 24. The front cover plate 25 has several second baffle holes. A groove 250 is formed on the side of the front cover plate 25 near the back plate 23. The rear cover plate 24 fits into the groove 250 and has third baffle holes 240 that match the second baffle holes. A waterproof and dustproof ePTFE membrane is provided between the front cover plate 25 and the rear cover plate 24. The ePTFE membrane can be an expanded polytetrafluoroethylene membrane.

[0030] The bottom of the plate groove 250 has a through hole, and the rear cover plate 24 has a countersunk hole 241. The countersunk hole 241 is located on the side away from the front cover plate 25. The front cover plate 25 and the rear cover plate 24 are fastened together by countersunk bolts, and the bolts are recessed into the countersunk hole 241 of the rear cover plate 24.

[0031] As a further explanation of this embodiment, the second ventilation baffle adopts a split structure of front cover plate 25 and rear cover plate 24, which can clamp and fix the ePTFE film between the two, ensuring reliable installation of the ePTFE film and facilitating disassembly and replacement; the countersunk connection method can ensure that the second ventilation baffle and the back plate 23 fit tightly together.

[0032] Both sides of the front cover plate 25 are fixedly connected to third connecting plates. The ends of the third connecting plates furthest from the front cover plate 25 are fixedly connected to third connecting blocks. Threaded holes are provided on the third connecting blocks. A third fixing plate 29 is provided on the side of the third connecting blocks furthest from the rear cover plate 24. The third fixing plate 29 is fixedly connected to the third connecting blocks by bolts. The end of the third fixing plate 29 furthest from the third connecting blocks is fixedly connected to the slider of the third linear module 28. The third linear module 28 is fixedly connected to the side plate inside the transition chamber 20. A variable frequency centrifugal fan 26 is installed inside the transition chamber 20.

[0033] As a further explanation of this embodiment, when the third ventilation hole 27 is in the open state, the slider of the third linear module 28 moves, causing the third connecting plate to move, so that the baffle hole on the second ventilation baffle and the third ventilation hole 27 form a matching state. External air is drawn into the transition chamber 20 through the variable frequency centrifugal fan 26. The incoming gas is filtered through the ePTFE membrane and then enters the inside of the chassis 1 through the second ventilation hole 12 to achieve active heat dissipation. When the third ventilation hole 27 is closed, the slider of the third linear module 28 moves, causing the third connecting plate to shift, so that the baffle hole on the second ventilation baffle and the third ventilation hole 27 are misaligned. The non-opening area of ​​the second ventilation baffle blocks the third ventilation hole 27, blocking the gas exchange between the inside and outside of the chassis 1 and stopping active heat dissipation.

[0034] An air guide hole 22 is provided above the second ventilation hole 12 inside the transition chamber 20. A miniature air pump 21 is installed at the air guide hole 22 and is fixedly connected to an air pump mounting plate fixedly connected to the inner wall of the transition chamber 20. The input end of the miniature air pump 21 is connected to the inside of the transition chamber 20, and the output end of the miniature air pump 21 is connected to the air guide hole 22 through a pipeline.

[0035] The air vent 22 is connected to the air duct 13 inside the chassis 1. The first section of the air duct 13 extends vertically upward to the top of the chassis 1, then bends towards the door 3. The second section of the air duct 13 leads vertically to the door 3. The second section of the air duct 13 branches off to form a third section, which is arranged along the top and sides of the embedded door 3 and has several air sealing holes 19. When the door 3 is closed, its top and sides can cover the air sealing holes 19 on the third section of the air duct 13. A detection sensor 30 is installed on the inner side of the top of the door 3 inside the chassis 1 to detect whether the door 3 is open.

[0036] A temperature sensor 14 is installed inside the chassis 1, and a dust detection sensor 5 is fixedly connected to the top of the transition chamber 20. A transformer is fixedly connected inside the chassis 1.

[0037] As a further explanation of this embodiment, since the transformer equipment inside the chassis 1 has a high temperature, hot air will accumulate at the top of the chassis 1. When the door 3 is opened, the hot air will quickly rush out from the upper gap of the door 3. After the hot air flows out, the pressure inside the cabinet drops instantly, forming a local negative pressure. In order to balance the pressure, the denser cold air from the outside will rush in violently from the door 3, causing external dust to enter the interior of the chassis 1. Therefore, when the detection sensor 30 detects that the door 3 is about to be opened, the micro air pump 21 immediately starts, delivering the gas in the transition chamber 20 through the air guide hole 22 to the air guide channel 13, and then discharging it through the air seal hole 19 at the door 3, forming an instantaneous air seal barrier at the moment the door 3 is opened, preventing dust-laden gas from rushing into the interior of the chassis 1.

[0038] The working principle and usage process of this embodiment are as follows: Dust detection sensor 5 monitors the dust concentration in the external environment of chassis 1 in real time, and temperature sensor 14 monitors the internal temperature of chassis 1 in real time.

[0039] When the internal temperature of chassis 1 is normal and the external dust concentration is low, the first ventilation port is opened and the third ventilation hole 27 is closed, and the low-voltage cabinet achieves natural ventilation and heat dissipation through the first ventilation port.

[0040] When the internal temperature of the chassis 1 is high and the external dust concentration is low, both the first ventilation port and the third ventilation hole 27 are opened; at the same time, the variable frequency centrifugal fan 26 in the transition chamber 20 starts, drawing air from the outside through the third ventilation hole 27. After the airflow enters the transition chamber 20, it flows into the chassis 1 through the second ventilation hole 12, forming a dual heat dissipation mode that combines natural ventilation from the first ventilation port with active air intake from the variable frequency centrifugal fan 26.

[0041] When the external dust concentration is high, the first vent is closed regardless of the internal temperature of the chassis 1. The variable frequency centrifugal fan 26 in the transition chamber 20 starts and draws air from the outside through the third vent 27. The dust-laden airflow is filtered and purified by the ePTFE membrane and then enters the interior of the chassis 1 through the second vent 12, thus achieving the dual effects of dust prevention and filtration and heat dissipation.

[0042] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above-described embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A low-voltage switchgear for power equipment, comprising a chassis (1), wherein both sides of the chassis (1) are provided with first ventilation holes (4), characterized in that, The chassis (1) is provided with a movable first ventilation baffle (16) at the position corresponding to the first ventilation hole (4). The first ventilation baffle (16) is provided with a first baffle hole (17) that cooperates with the first ventilation hole (4). The chassis (1) is provided with a door (3) on one side. A transition chamber (20) is provided on the side of the chassis (1) away from the door (3). The transition chamber (20) is connected to the chassis (1) through a second ventilation hole (12). A back plate (23) is provided on the side of the transition chamber (20) away from the chassis (1). A third ventilation hole (27) is provided on the back plate (23). A movable second ventilation baffle is provided at the third ventilation hole (27) inside the transition chamber (20). A baffle hole matching the third ventilation hole (27) is provided on the second ventilation baffle. The second ventilation baffle includes a front cover plate (25) and a rear cover plate (24). An ePTFE membrane is provided between the front cover plate (25) and the rear cover plate (24). The transition chamber (20) is equipped with a variable frequency centrifugal fan (26). The transition chamber (20) is also equipped with an air guide hole (22). A micro air pump (21) is installed at the air guide hole (22). The air guide hole (22) is connected to the air guide channel (13) inside the chassis (1). The end of the air guide channel (13) is arranged along the door (3) and has several air seal holes (19). A detection sensor (30) for detecting whether the door (3) is open is installed at the door (3) inside the chassis (1). A temperature sensor (14) and a dust detection sensor (5) are installed inside and outside the chassis (1), respectively.

2. The low-voltage switchgear for power equipment according to claim 1, characterized in that, The first ventilation baffle (16) moves via a first driving mechanism. The first driving mechanism includes a first connecting plate (15) and a second connecting plate (18) fixedly connected to the upper and lower sides of the first ventilation baffle (16). The first connecting plate (15) and the second connecting plate (18) are respectively provided with a first connecting block (8) and a second connecting block (9) on the side away from the first ventilation baffle (16). The first connecting block (8) and the second connecting block (9) are respectively fixedly connected to a first fixing plate (7) and a second fixing plate (10). The first fixing plate (7) and the second fixing plate (10) are respectively fixedly connected to the sliders of the first linear module (6) and the second linear module (11). The first linear module (6) and the second linear module (11) are both fixedly connected inside the chassis (1).

3. The low-voltage switchgear for power equipment according to claim 1, characterized in that, The front cover plate (25) of the second ventilation baffle has a groove (250) on the side near the back plate (23). A rear cover plate (24) is fitted in the groove (250). A threaded hole is provided at the bottom of the groove (250). A countersunk hole (241) matching the threaded hole is provided on the side of the rear cover plate (24) away from the front cover plate (25). The rear cover plate (24) and the front cover plate (25) are fixedly connected by countersunk screws passing through the countersunk hole (241) and the threaded hole. The ePTFE membrane is clamped between the front cover plate (25) and the rear cover plate (24).

4. The low-voltage switchgear for power equipment according to claim 3, characterized in that, The rear cover plate (24) is provided with a third baffle hole (240) that matches the third ventilation hole (27), and the front cover plate (25) is provided with a second baffle hole that matches the third baffle hole (240).

5. The low-voltage switchgear for power equipment according to claim 3, characterized in that, The second ventilation baffle moves via a second driving mechanism. The second driving mechanism includes third connecting plates fixedly connected to both sides of the second ventilation baffle. The ends of the two third connecting plates are fixedly connected to third connecting blocks. The third connecting blocks are fixedly connected to a third fixing plate (29) by bolts. The third fixing plate (29) is fixedly connected to the slider of the third linear module (28). The third linear module (28) is fixedly connected to the side plate of the transition chamber (20).

6. The low-voltage switchgear for power equipment according to claim 1, characterized in that, The air guide channel (13) extends vertically upward to the top of the chassis (1) to form the first section. The air guide channel (13) bends vertically and connects to one side of the door (3) to form the second section. The air guide channel (13) splits to both sides at the door (3) and forms the third section along the top and sides of the door (3). The air seal hole (19) is opened on the third section.

7. The low-voltage switchgear for power equipment according to claim 1, characterized in that, When the door (3) is closed, its top and sides are covered with air-sealing holes (19).

8. The low-voltage switchgear for power equipment according to claim 1, characterized in that, The top of the box door (3) is equipped with a rainproof plate (2).

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