Ventilation pressure relief device and switch cabinet thereof

Abstract

The invention relates to the technical field of switch cabinets, in particular to a ventilation pressure relief device and a switch cabinet thereof.The ventilation pressure relief device comprises a top box and a mounting seat arranged on the rear side of the lower surface of the top box, and the mounting seat is sequentially provided with an exhaust assembly used for exhausting air in the switch cabinet, an overturning piece and an air inlet assembly used for blowing air into the switch cabinet from bottom to top; a driving part used for driving the overturning part and the air inlet assembly to rotate is arranged in the top box. In a normal state, heat dissipation work of the switch cabinet can be achieved through cooperation of the air inlet assembly and the exhaust assembly, the air blowing direction of the air inlet assembly is changed through driving, the overturning piece is in an open state, meanwhile, the top plate moves upwards to enable the exhaust hole to be communicated with the interior of the switch cabinet, and the purpose of rapid pressure relief is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinets, and in particular to a ventilation and pressure relief device and a switch cabinet thereof. Background Art

[0002] The main function of the switchgear is to open and close, control and protect electrical equipment in the process of power generation, transmission, distribution and energy conversion in the power system. The components in the switchgear mainly include circuit breakers, disconnectors, load switches, operating mechanisms, mutual inductors and various protective devices. During the operation of the switchgear, a short circuit fault may occur in the primary circuit due to various reasons (such as short circuit, insulation aging, human operation error, etc.). Under the short-circuit current of tens of thousands of amperes, high-temperature and high-pressure gas is instantly generated. If the high-temperature and high-pressure gas cannot be effectively released in a very short time in the narrow cabinet, it will cause the switchgear to explode, damage the adjacent switchgear, and may also endanger personal safety.

[0003] For example, a Chinese utility model patent with announcement number CN219843349U discloses a switch cabinet with a ventilation and pressure relief device, which relates to the field of electrical switch technology, including a cabinet body, a ventilation unit and a pressure relief unit; the cabinet body is a box-type structure with an open front end; the ventilation unit comprises a vent, a fan, a connecting plate, a nut and a ventilation box, a rectangular vent is opened at the top of the cabinet body, the lower end of the vent is fixedly connected to the top of the fan, the top of the cabinet body is detachably connected to the bottom end of the connecting plate, the four corners of the connecting plate are respectively threadedly connected to four nuts, and the top of the connecting plate is fixedly connected to the bottom end of the ventilation box; the pressure relief unit is installed at the left end of the ventilation box, and the switch cabinet with a ventilation and pressure relief device is provided with a fan, which can maintain a good ventilation environment in the cabinet body without natural wind. During pressure relief, the pressure relief box is movably connected to the ventilation box when opened, and will not fall off to cause damage to the surrounding area, and the installation is simple and convenient to operate.

[0004] The above solution has the following shortcomings in actual use:

[0005] This solution uses pressure to push the pressure relief box, which drives the clamping column to close, shortens the spring in the telescopic support, slides along the slide groove, and the clamping column and the clamping plate are in contact and clamped state. The pressure relief box flips outward and opens to release the pressure. In actual use, the high-temperature and high-pressure gas in the switch cabinet can only be relieved through one part of the pressure relief box, resulting in less than ideal pressure relief efficiency. Summary of the invention

[0006] The object of the present invention is to provide a ventilation and pressure relief device and a switch cabinet thereof to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ventilation and pressure relief device and a switch cabinet thereof, comprising a top box and a mounting seat arranged on the rear side of the lower surface of the top box, the mounting seat being provided with an exhaust assembly for discharging the air in the switch cabinet, a flip member and an air intake assembly for blowing air into the switch cabinet in sequence from bottom to top, a driving member for driving the flip member and the air intake assembly to rotate is provided in the top box; the driving member comprises a top plate, a plurality of guide columns are sleeved on the top plate, and the top ends of the guide columns are connected to the top of the inner wall of the top box, a spring is provided between the top of the inner wall of the top box and the top plate, the rear side of the top plate extends to the interior of the mounting seat and is provided with a driving plate, a mounting platform is provided at the bottom of the top box, electromagnets are provided on the mounting platform and the top plate, and a thermistor is provided on the lower surface of the mounting platform.

[0008] Preferably, the mounting seat is provided with a plurality of mounting grooves from top to bottom, the plurality of mounting grooves are symmetrically arranged, and the exhaust assembly, the flip member and the air inlet assembly are respectively located inside the mounting grooves.

[0009] Preferably, the exhaust assembly includes a first mounting frame, the first mounting frame is in a cross-shaped structure, and four first axial flow fans are installed on the first mounting frame.

[0010] Preferably, the air inlet assembly includes a second mounting bracket, the second mounting bracket is in a cross-shaped structure, a second axial flow fan is arranged in the space enclosed by the second mounting bracket and the inner wall of the mounting groove, two second axial flow fans located at the same height are connected by a connecting rod, a shaft body 17 is arranged on one side of one of the second axial flow fans, an end of the shaft body 17 extends into the mounting seat 2 and is provided with a first gear, the first gear is meshedly connected with a toothed plate, and the toothed plate is connected to the driving plate.

[0011] Preferably, the flip member includes a flip baffle, which is rotatably connected to the inner wall of the mounting groove through a connecting shaft, one end of the connecting shaft extends to the interior of the mounting seat and is provided with a second gear, one side of the second gear is provided with a driving bar connected to the driving plate, and the lower part of the driving bar is provided with a plurality of racks corresponding to the second gear.

[0012] Preferably, the top and bottom of the inner wall of the installation groove are provided with baffles for limiting the flipping of the flip baffle, and a torsion spring is installed on the connecting shaft.

[0013] Preferably, a power module is provided on the top of the inner wall of the top box, and the power module is electrically connected to the electromagnet, the thermistor, the air inlet assembly and the exhaust assembly through wires.

[0014] Preferably, a protective net for protecting the thermistor is provided on the lower surface of the mounting platform.

[0015] Preferably, a frame is provided at the rear side of the mounting seat, and a safety net is installed in the frame.

[0016] A switch cabinet comprises a cabinet body and a cabinet door. A circuit breaker room, a busbar room, a cable room and an instrument room are arranged inside the cabinet body. A ventilation and pressure relief device is installed on the cabinet body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Under normal conditions, the heat dissipation of the switch cabinet can be achieved through the cooperation of the air intake assembly and the exhaust assembly. By driving to change the blowing direction of the air intake assembly and to open the flip part, the top plate moves up to connect the exhaust hole with the inside of the switch cabinet, so as to achieve the purpose of rapid pressure relief.

[0019] By adopting thermistors, the current in the circuits where the power module, wires and electromagnets, thermistors, air intake components and exhaust components are located can be increased under high temperature conditions, and the motor speed in the air intake components and exhaust components can be increased, so that different degrees of heat dissipation intensity can be adopted in real time according to the temperature changes in the switch cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the overall structure of the ventilation and pressure relief device of the present invention;

[0021] Figure 2 It is a cross-sectional view of the overall structure of the ventilation and pressure relief device of the present invention;

[0022] Figure 3 A three-dimensional diagram of the top box and mounting seat structure of the ventilation and pressure relief device of the present invention;

[0023] Figure 4 A three-dimensional diagram of the driving component structure of the ventilation and pressure relief device of the present invention;

[0024] Figure 5 This is a structural exploded view of the air inlet assembly of the ventilation and pressure relief device of the present invention;

[0025] Figure 6 A three-dimensional diagram of the structure of the flip member of the ventilation and pressure relief device of the present invention;

[0026] Figure 7 A three-dimensional diagram of the exhaust assembly structure of the ventilation and pressure relief device of the present invention;

[0027] Figure 8 It is a stereoscopic diagram of the overall structure of the switch cabinet of the present invention;

[0028] Fig. 9 It is a three-dimensional diagram of the structure of the switch cabinet of the present invention in an open state.

[0029] In the figure:

[0030] 1. Top box; 2. Mounting seat; 3. Mounting slot; 4. First mounting frame; 5. First axial flow fan; 6. Top plate; 7. Guide column; 8. Spring; 9. Drive plate; 10. Mounting table; 11. Electromagnet; 12. Thermistor; 13. Protective net; 14. Second mounting frame; 15. Second axial flow fan; 16. Connecting rod; 17. Shaft; 18. First gear; 19. Tooth plate; 20. Flip baffle; 21. Connecting shaft; 22. Torsion spring; 23. Baffle bar; 24. Second gear; 25. Drive bar; 26. Rack; 27. Cavity; 28. Power module; 29. ​​Frame; 30. Safety net; 31. Exhaust hole; 32. Cabinet; 33. Cabinet door; 34. Circuit breaker room; 35. Busbar room; 36. Cable room; 37. Instrument room. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-9 , the present invention provides a technical solution:

[0033] A ventilation and pressure relief device comprises a top box 1 and a mounting base 2 arranged on the rear side of the lower surface of the top box 1, and an air intake assembly and an exhaust assembly are arranged on the mounting base 2, the air intake assembly is used for blowing air into the switch cabinet, and the exhaust assembly is used for exhausting the air in the switch cabinet. Under normal conditions, the heat dissipation of the switch cabinet can be achieved through the cooperation of the air intake assembly and the exhaust assembly, and the driving member on the mounting base 2 is used to change the blowing direction of the air intake assembly, which can enable the air intake group to exhaust the gas in the switch cabinet to the outside of the switch cabinet when a primary circuit short circuit occurs due to various reasons (such as short circuit, insulation aging, human operation error, etc.) in the switch cabinet under a short circuit current of tens of thousands of amperes and high-temperature and high-pressure gas is instantly generated, thereby achieving the purpose of rapid pressure relief.

[0034] like Figure 1-3 As shown, the mounting seat 2 is provided with a plurality of mounting grooves 3 from top to bottom, and the plurality of mounting grooves 3 are symmetrically arranged. In the present embodiment, the number of the mounting grooves 3 is 6, wherein the two groups of air intake assemblies are respectively located in the two topmost mounting grooves 3, and the two groups of exhaust assemblies are respectively located in the two bottommost mounting grooves 3. A flip member is provided in the middle mounting groove 3, and the flip member can be in an open state while the driving member changes the blowing direction of the ventilation assembly, thereby improving the pressure relief effect.

[0035] like Figure 7 As shown, the exhaust assembly includes a first mounting frame 4, which is in a cross-shaped structure. A first axial flow fan 5 is arranged in the space enclosed by the first mounting frame 4 and the inner wall of the mounting groove 3.

[0036] like Figure 4 As shown, the driving member includes a top plate 6, which is slidably connected to the inner wall of the top box 1. The four guide columns 7 in the top box 1 are used to further limit the movement direction of the top plate 6 and improve the stability of the top plate 6 during movement. The four springs 8 on the top of the inner wall of the top box 1 are used to apply a downward force to the top plate 6, so that the top plate 6 can be located at the bottom of the top box 1 when the switch cabinet is operating normally. A plurality of exhaust holes 31 are provided on the side wall of the top box 1. A mounting platform 10 is provided at the bottom of the top box 1. Electromagnets 11 are installed on the upper surface of the mounting platform 10 and the lower surface of the top plate 6. The magnetic force of the electromagnet 11 is changed by controlling the current flowing to the electromagnet 11, thereby pushing the top plate 6 to move upward under the principle of like poles repelling each other. A thermistor 12 is installed in the middle of the lower surface of the mounting platform 10. When the internal temperature of the switch cabinet increases, the resistance of the thermistor 12 decreases, resulting in an increase in the current in the circuit, thereby changing the magnetic force between the two electromagnets 11. The driving plate 9 on the rear side of the top plate 6 is located in the cavity 27 on the mounting seat 2.

[0037] It should be noted that the two electromagnets 11, the thermistor 12, the air inlet assembly and the exhaust assembly are connected in series. When the temperature is high, the resistance of the thermistor 12 decreases, the current flowing through the two electromagnets 11, the air inlet assembly and the exhaust assembly increases, the magnetic force between the two electromagnets 11 increases, and the motor speed in the air inlet assembly and the exhaust assembly increases. That is, when the switch cabinet needs to dissipate heat for normal operation, as the temperature in the switch cabinet increases, the current in the circuit increases. Under the action of the elastic force of the spring 8 and the gravity of the top plate 6 itself, the top plate 6 will not move up, and the motor speed in the air inlet assembly and the exhaust assembly increases, which can accelerate the heat dissipation effect of the switch cabinet. When the temperature in the switch cabinet continues to rise to an abnormal state or a high temperature and high pressure state occurs when a fault occurs, the magnetic force between the two electromagnets 11 increases, pushing the top plate 6 to move up until the multiple exhaust holes 31 are connected to the inside of the switch cabinet, and at the same time the air inlet assembly changes the blowing direction, the flip part is in an open state, and the high temperature and high pressure gas will be quickly discharged to the outside of the switch cabinet through the side of the top box 1 and the mounting seat 2.

[0038] like Figure 5As shown, the air inlet assembly includes a second mounting frame 14, which is in a cross-shaped structure. A second axial fan 15 is arranged in the space enclosed by the second mounting frame 14 and the inner wall of the mounting groove 3. The two second axial fans 15 located at the same height are connected by a connecting rod 16. The shaft 17 on one of the second axial fans 15 extends into the cavity 27 on the mounting seat 2 and is installed with a first gear 18. The first gear 18 is meshedly connected with a tooth plate 19, and the tooth plate 19 can move with the movement of the driving plate 9. When the top plate 6 drives the driving plate 9 to start moving, the second axial fan 15 will be flipped under the transmission of the first gear 18 and the tooth plate 19. When the switch cabinet fails and generates high-temperature and high-pressure gas, the top plate 6 moves to the top of the mounting seat 2. At this time, the second axial fan 15 flips 180°, and the second axial fan 15 can accelerate the discharge of the high-temperature and high-pressure gas in the switch cabinet.

[0039] In which, in actual use, the elastic coefficient of the spring 8 can also be changed. When the switch cabinet operates normally but the temperature is high, the top plate 6 will be lifted up under the action of the magnetic force, causing the drive plate 9 to start moving up, and the second axial flow fan 15 will be deflected. When the temperature drops, the magnetic force weakens, and the top plate 6 moves down to reset the second axial flow fan 15, thereby achieving air blowing and heat dissipation at the heat-generating position according to the switch cabinet in the working state.

[0040] like Figure 6 As shown, the flip member includes a flip baffle 20, which is rotatably connected to the inner wall of the mounting groove 3 through a connecting shaft 21, one end of the connecting shaft 21 extends to the interior of the cavity 27 and is installed with a second gear 24, one side of the second gear 24 is provided with a driving bar 25 connected to the driving plate 9, and the lower part of the driving bar 25 is provided with a plurality of racks 26 corresponding to the second gear 24, and the top and bottom of the inner wall of the mounting groove 3 are provided with baffles 23 for limiting the flipping of the flip baffle 20, and a torsion spring 22 is provided between the connecting shaft 21 and the inner wall of the cavity 27, so that the flip baffle 20 can fit with the baffle 23 when the switch cabinet is in normal working state.

[0041] Furthermore, a power supply module 28 is provided on the top of the inner wall of the top box 1 for supplying power to the electromagnet 11, the thermistor 12, the air intake assembly and the exhaust assembly. By adopting a separate power supply module 28 for power supply, it is possible to avoid damage to the circuits between the electromagnet 11, the thermistor 12, the air intake assembly and the exhaust assembly when a switch cabinet fails.

[0042] The protective net 13 on the lower surface of the mounting platform 10 is used to protect the thermistor 12 to prevent the thermistor 12 from being damaged due to collision when components in the switch cabinet burst. A frame 29 is provided on the rear side of the mounting base 2, and a safety net 30 is installed inside the safety net 30 for blocking component fragments.

[0043] When the ventilation and pressure relief device needs to be installed on the switch cabinet, the top box 1 and the mounting base 2 with the corresponding width to the switch cabinet are customized, and then the top plate and the back plate of a part of the switch cabinet are removed, and then the ventilation and pressure relief device can be fixed to the switch cabinet by bolts.

[0044] The working process of this embodiment is as follows: when the switch cabinet is working normally, the power supply module 28 supplies power to the electromagnet 11, the thermistor 12, the air inlet assembly and the exhaust assembly. The air inlet assembly blows the cold air outside the switch cabinet into the inside of the switch cabinet, and the exhaust assembly discharges the hot air inside the switch cabinet to the outside of the switch cabinet, thereby forming a cycle to effectively dissipate heat for the switch cabinet. When a fault occurs in the switch cabinet and causes a large amount of high-temperature and high-pressure gas to be generated, the air inlet assembly is flipped 180° under the drive of the driving member. At this time, the air inlet assembly and the exhaust assembly are simultaneously used to discharge the high-temperature and high-pressure gas inside the switch cabinet. The flip member is in an open state, and the exhaust hole 31 on the top box 1 is also connected to the inside of the switch cabinet. The high-temperature and high-pressure gas can also be discharged through the flip member and the exhaust hole 31, thereby realizing the need for rapid pressure relief inside the switch cabinet.

[0045] A switch cabinet comprises a cabinet body 32 and a cabinet door 33. A circuit breaker chamber 34, a busbar chamber 35, a cable chamber 36 and an instrument chamber 37 are arranged inside the cabinet body 32. A ventilation and pressure relief device is installed on the cabinet body 32.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ventilation and pressure relief device, comprising a top box and a mounting seat arranged on the rear side of the lower surface of the top box, characterized in that: The mounting seat is provided with an exhaust assembly for exhausting the air in the switch cabinet, a flip member and an air intake assembly for blowing air into the switch cabinet in sequence from bottom to top, and a driving member for driving the flip member and the air intake assembly to rotate is provided in the top box; The driving member includes a top plate, a plurality of guide columns are sleeved on the top plate, and the top ends of the guide columns are connected to the top of the inner wall of the top box, a spring is arranged between the top of the inner wall of the top box and the top plate, the rear side of the top plate extends to the interior of the mounting seat and is provided with a driving plate, a mounting platform is arranged at the bottom of the top box, electromagnets are arranged on the mounting platform and the top plate, and a thermistor is arranged on the lower surface of the mounting platform.

2. A ventilation and pressure relief device according to claim 1, characterized in that: The mounting seat is provided with a plurality of mounting grooves from top to bottom, and the plurality of mounting grooves are symmetrically arranged, and the exhaust assembly, the flip member and the air inlet assembly are respectively located inside the mounting grooves.

3. A ventilation and pressure relief device according to claim 1, characterized in that: The exhaust assembly includes a first mounting frame, which is in a cross-shaped structure, and four first axial flow fans are installed on the first mounting frame.

4. A ventilation and pressure relief device according to claim 1, characterized in that: The air intake assembly includes a second mounting frame, which is in a cross-shaped structure. A second axial fan is arranged in the space enclosed by the second mounting frame and the inner wall of the mounting groove. The two second axial fans located at the same height are connected by a connecting rod. A shaft 17 is arranged on one side of one of the second axial fans. The end of the shaft 17 extends into the mounting seat 2 and is provided with a first gear. The first gear is meshed with a tooth plate, and the tooth plate is connected to the driving plate.

5. A ventilation and pressure relief device according to claim 2, characterized in that: The flip member includes a flip baffle, which is rotatably connected to the inner wall of the mounting groove through a connecting shaft, one end of the connecting shaft extends to the interior of the mounting seat and is provided with a second gear, one side of the second gear is provided with a driving bar connected to the driving plate, and the lower part of the driving bar is provided with a plurality of racks corresponding to the second gear.

6. A ventilation and pressure relief device according to claim 5, characterized in that: The top and bottom of the inner wall of the installation groove are provided with baffle bars for limiting the flipping of the flip baffle, and a torsion spring is installed on the connecting shaft.

7. A ventilation and pressure relief device according to claim 1, characterized in that: A power module is arranged on the top of the inner wall of the top box, and the power module is electrically connected to the electromagnet, the thermistor, the air inlet assembly and the exhaust assembly through a wire.

8. A ventilation and pressure relief device according to claim 1, characterized in that: A protection net for protecting the thermistor is arranged on the lower surface of the mounting platform.

9. A ventilation and pressure relief device according to claim 1, characterized in that: A frame is arranged at the rear side of the mounting seat, and a safety net is installed in the frame.

10. A switch cabinet, comprising a cabinet body and a cabinet door, wherein a circuit breaker room, a busbar room, a cable room and an instrument room are arranged inside the cabinet body, characterized in that: The cabinet is installed with a ventilation and pressure relief device as described in any one of claims 1 to 9.

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