Low-position air exhaust anti-backflow device for power distribution station house

Abstract

The invention discloses a low-position air exhaust anti-backflow device for a power distribution station house, and belongs to the technical field of air exhaust of power distribution stations. The device comprises an air exhaust bin and three pipeline fans, the three pipeline fans are fixedly connected to one side of the air exhaust bin in parallel, air outlets of the three pipeline fans communicate with an inner cavity of the air exhaust bin, the outer wall of the air exhaust bin is fixedly connected with a ventilation room, an air exhaust opening is formed in the top of one side of the ventilation room, and the air exhaust opening is communicated with the inner cavity of the air exhaust bin. The outer wall of one side of the air exhaust bin is attached to the inner wall of the air exhaust opening, and the sides, away from the air exhaust bin, of the three pipeline fans are fixedly connected with L-shaped pipes. On one hand, the requirement for pumping out hot air in the station house at a low position is met through the air inlet bin, on the other hand, the hot air is exhausted out of the station house through the air exhaust bin arranged at a high position, and the situation that external rainwater flows backwards into the station house from the low position is effectively prevented; rainwater can be prevented from flowing into the station building through the side wall of the air inlet bin within a period of time.

Description

Technical Field

[0001] The invention belongs to the technical field of ventilation of distribution stations, and in particular relates to a low-position ventilation backflow prevention device for distribution station buildings. Background Art

[0002] A distribution station is an indoor power distribution site with low-voltage loads. It mainly distributes electricity to low-voltage users and is equipped with medium-voltage incoming lines, distribution transformers, and low-voltage distribution devices. The components inside the distribution station will accumulate a lot of heat when they are powered on for a long time, and they need to be equipped with heat dissipation and exhaust facilities to ventilate and dissipate heat in time. For distribution stations with low installation heights of heat-generating components, low-level exhaust devices need to be used for targeted heat dissipation.

[0003] After searching, the Chinese patent application with application publication number CN114673421A discloses a substation flood prevention device, which aims to provide a substation flood prevention device that can effectively prevent rainwater from entering the substation when the flood season comes without affecting the daily inspection and maintenance work of the staff and the handling of equipment. The main waterproof measure of the device is to prevent rainwater from penetrating through the expansion of the airbag, but the expansion of the airbag is not reversible and needs to be reset manually, and it cannot effectively discharge the rainwater inside the station. At the same time, the kinetic energy generated by the expansion of the airbag may cause damage to the substation structure. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems that the anti-flooding device of the distribution station building cannot effectively drain the rainwater inside the station building and the waterproof components may cause damage to the distribution station structure, and propose a low-level exhaust and anti-backflow device for the distribution station building.

[0005] In order to achieve the purpose of the present invention, the present invention discloses a low-level exhaust backflow prevention device for a distribution station building, comprising an exhaust bin and three duct fans, the three duct fans are fixedly connected to one side of the exhaust bin in parallel, and the air outlets of the three duct fans are all connected to the inner cavity of the exhaust bin; the outer wall of the exhaust bin is fixedly connected to a ventilation room, the top of one side of the ventilation room is provided with an exhaust outlet, and the outer wall of one side of the exhaust bin is fitted to the inner wall of the exhaust outlet; the three duct fans are fixedly connected to an L-shaped pipe on one side away from the exhaust bin, the bottom ends of the three L-shaped pipes are fixedly connected to the same air inlet bin, one side of the top of the air inlet bin is provided with an air suction port, and the bottom of the ventilation room close to the air inlet bin is provided with an air inlet. There is an air inlet, and the outer wall of the air inlet bin is fitted with the inner wall of the air inlet; the air suction port is slidably connected to a sliding window, the inner wall of the sliding window is fixedly connected to a filter, a floating plate is arranged inside the air inlet bin, a side of the floating plate close to the air inlet is fixedly connected to a lifting plate, and a side of the floating plate away from the lifting plate is fixedly connected to a cover plate; the bottom of the air inlet bin close to the cover plate is fixedly connected to a main drain pipe, a pipe mouth at one end of the main drain pipe is fitted to one side of the cover plate, the other end of the main drain pipe extends to the outside of the ventilation room, and a solenoid valve is arranged in the middle of the main drain pipe, the plate body of the floating plate is provided with evenly distributed through holes, and the bottom of the floating plate is fixedly connected to two symmetrically arranged heightening strips.

[0006] Furthermore, the inner walls on both sides of the air intake port are provided with sliding grooves, the interiors of the two sliding grooves are slidably connected to limit strips, the two limit strips are respectively fixedly connected to the two sides of the sliding window, and a handle is fixedly connected to the middle position of the top outer wall of the sliding window.

[0007] Furthermore, an inspection door is hinged at the bottom of one side of the ventilation room, a handle is provided on one side of the middle of the inspection door, and an observation window is provided at the middle position of the top of the inspection door.

[0008] Furthermore, a buzzer is fixedly connected to the outer wall of the top of the ventilation room, and a tower light is fixedly connected to the outer wall of the top of the ventilation room, the solenoid valve is connected to a switch through a wire, the switch is connected to a power supply through a wire, and the buzzer and the tower light are both connected in series to the power circuit of the solenoid valve.

[0009] Furthermore, a positioning frame is fixedly connected to the outer wall of the ventilation room near the exhaust port, and two fastening ears are fixedly connected to both sides of the positioning frame. One side of the positioning frame is in the same plane as the outer wall of the ventilation room near the exhaust port, and a glue groove is provided on the other side of the positioning frame. A sealing strip is bonded to the connection between the exhaust bin and the exhaust port.

[0010] Furthermore, vertically arranged grooved wood sound-absorbing panels are fixedly connected to the inner walls on both sides of the ventilation room.

[0011] Furthermore, an inclined baffle is fixedly connected to the inner wall of the exhaust bin away from the duct fan.

[0012] Furthermore, a hanger is fixedly connected to the inner wall of the top of the ventilation room, and the outer walls of the bottoms of the three duct fans are in contact with the inner wall of the bottom of the hanger.

[0013] Furthermore, a secondary drain pipe is inserted into the side of the air inlet bin close to the main drain pipe, and a transparent tube is fixedly connected to the top of the secondary drain pipe close to the air inlet bin. The transparent tube is connected to the interior of the air inlet bin through the secondary drain pipe, and a valve is provided in the middle of the secondary drain pipe.

[0014] Furthermore, a shell is fixedly connected to the inner wall of the air inlet bin near the air suction port, a threaded sleeve is fixedly connected to the middle position of the top of the shell, a screw is connected to the internal thread of the threaded sleeve, an upper contact piece is rotatably connected to the bottom of the screw, a turntable is fixedly connected to the top of the screw, a support rod is fixedly connected to one side of the top of the lifting plate, a striker is fixedly connected to one side of the top of the support rod, a connecting sleeve is threadedly connected to the top of the striker, a lower contact piece is fixedly connected to the top of the connecting sleeve, and the lower contact piece is located inside the shell, the connecting sleeve and the screw are both made of insulating material, the lower contact piece and the upper contact piece are both made of conductive material, and the lower contact piece and the upper contact piece are respectively connected to the two poles of a power supply through wires.

[0015] Compared with the prior art, the significant progress of the present invention is that: 1) the device is provided with an L-shaped pipe, an air inlet bin, an air exhaust bin, a floating plate, a through hole, a main drain pipe and a solenoid valve, and the L-shaped pipe is designed with its own height and different directions at both ends to realize the low-level suction and high-level exhaust of the station house. On the one hand, the air inlet bin is used to solve the demand for extracting hot air in the station house at a low level, and on the other hand, the high-level exhaust bin is used to discharge the hot air out of the station house, effectively preventing the external rainwater from flowing back into the station house from a low level. When extremely bad weather occurs and there is a possibility that rainwater will flow into the air inlet bin through the pipe, the air inlet of the air inlet bin is set At the top of its side, it can block rainwater from flowing into the station house through the side wall of the air inlet bin for a period of time. During this period of time, rainwater seeps through the through holes and gathers under the floating plate raised by the heightening strip. As the rainwater gathers more and more in the air inlet bin, the floating plate continues to rise under the action of buoyancy. At this time, the lifting plate rises synchronously to block the air intake port to prevent accumulated water from entering the station house. At the same time, the cover plate leaves one side of the main drain pipe, and the solenoid valve is controlled to be turned on, so that the accumulated water can be discharged from the main drain pipe to the outside of the station house. Under the premise of ensuring the low-level exhaust and heat dissipation of the device, the function of preventing rainwater from penetrating into the station house and caching and accumulating water in bad weather is realized. Discharge function; 2) This device is equipped with a tower light, buzzer and inspection door. When water enters the air inlet compartment, the solenoid valve is turned on to drain the water. At the same time, the tower light and buzzer are started synchronously. The sound and light signal transmission is used to remind the staff to make further waterproof inspection and treatment, and timely check for safety hazards. The side of the ventilation room is equipped with an inspection door inside the station building, which is convenient for the staff to inspect the device and prevent rainwater from entering the ventilation room through the inspection door. During maintenance, the inspection door can be opened and closed by the handle, and the internal status of the ventilation room can be preliminarily observed through the observation window; 3) This device is equipped with a positioning frame, a glue groove and a fastening ear. The fastening ears connect the ventilation room to the side wall of the power distribution station, and the glue groove fits the outer wall of the power distribution station. Before the installation is completed, the sealant is poured into the glue groove to enhance the installation effect on the one hand and optimize the waterproof effect on the other hand. The side of the positioning frame with the glue groove fits the outer wall of the power distribution station. The positioning of the ventilation room and the power distribution station during the installation process is assisted by the contour of the positioning frame; 4) This device is provided with a valve, a secondary drain pipe, and a transparent pipe. The valve is normally closed. The transparent pipe, the secondary drain pipe and the air inlet bin form a connecting pipe structure, which is convenient for the staff to accurately control the water inflow inside the air inlet bin through the water level inside the transparent pipe;5) This device is provided with a lower contact piece, an upper contact piece and a screw rod. When the accumulated water rises, the floating plate and the lifting plate rise synchronously, and the support rod drives the striker to push upward, so that the lower contact piece is upwardly attached to the upper contact piece, and the electromagnetic valve, tower light and buzzer are controlled to be connected to the power supply. After the water level drops, the lower contact piece moves downward away from the upper contact piece, and the electromagnetic valve, tower light and buzzer are disconnected from the power supply, thereby realizing automatic control of the drainage and alarm functions. By rotating the screw rod by the turntable, the height of the upper contact piece can be adjusted, thereby changing the required rising distance when the lower contact piece is attached to the upper contact piece, realizing the control of the water intake required for the alarm and automatic drainage, so that the device can be applied to more different situations and places. ;

[0016] In order to more clearly illustrate the functional characteristics and structural parameters of the present invention, further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the front structure of a low-level exhaust and backflow prevention device for a power distribution station proposed by the present invention;

[0019] Figure 2 A schematic diagram of the cross-sectional structure of a ventilation room of a low-level exhaust and backflow prevention device for a power distribution station proposed by the present invention;

[0020] Figure 3 This is a schematic diagram of the back structure of a low-level exhaust and backflow prevention device for a power distribution station proposed by the present invention;

[0021] Figure 4 A schematic diagram of the partial structure of a low-level exhaust and backflow prevention device for a power distribution station proposed by the present invention;

[0022] Figure 5 This is a schematic structural diagram of location A of a low-level exhaust and backflow prevention device for a power distribution station proposed by the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of location B of a low-level exhaust and backflow prevention device for a power distribution station proposed by the present invention;

[0024] Figure 7 A schematic cross-sectional view of the air inlet compartment of a low-level exhaust and backflow prevention device for a power distribution station proposed by the present invention;

[0025] Figure 8 A schematic diagram of a floating plate structure of a low-level exhaust and backflow prevention device for a power distribution station proposed by the present invention;

[0026] Fig. 9This is a schematic diagram of the shell cross-sectional structure of a low-level exhaust and backflow prevention device for a distribution station building proposed by the present invention.

[0027] In the figure: 1. Ventilation room; 2. Tower lamp; 3. Buzzer; 4. Air inlet; 5. Inspection door; 6. Handle; 7. Observation window; 8. Exhaust bin; 9. Exhaust vent; 10. Baffle; 11. Positioning frame; 12. Main drain pipe; 13. Secondary drain pipe; 14. Fastening ear; 15. Sealing strip; 16. Through groove; 17. Hanger; 18. Pipe fan; 19. Grooved wood sound-absorbing board; 20. L-shaped pipe; 21. Gluing slot; 22. Air inlet bin; 23. Air inlet; 24. Pull handle; 25. Sliding window; 26. Filter; 27. Transparent tube; 28. Valve; 29. ​​Solenoid valve; 30. Slide; 31. Lifting plate; 32. Support rod; 33. Strike pin; 34. Shell; 35. Limiting strip; 36. Turntable; 37. Floating plate; 38. Heightening strip; 39. Cover plate; 40. Through hole; 41. Connecting sleeve; 42. Lower contact piece; 43. Upper contact piece; 44. Screw; 45. Threaded sleeve. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Reference Figure 1-9, a low-level exhaust backflow prevention device for a power distribution station comprises an exhaust bin 8 and three duct fans 18, the three duct fans 18 are fixedly connected to one side of the exhaust bin 8 in parallel, and the air outlets of the three duct fans 18 are all connected to the inner cavity of the exhaust bin 8, the outer wall of the exhaust bin 8 is fixedly connected to a ventilation room 1, an exhaust port 9 is provided at the top of one side of the ventilation room 1, the outer wall of one side of the exhaust bin 8 is fitted to the inner wall of the exhaust port 9, the three duct fans 18 are fixedly connected to an L-shaped pipe 20 on one side away from the exhaust bin 8, the bottom ends of the three L-shaped pipes 20 are fixedly connected to the same air inlet bin 22, a suction port 23 is provided on one side of the top of the air inlet bin 22, an air inlet 4 is provided at the bottom of the ventilation room 1 close to the air inlet bin 22, and the outer wall of the air inlet bin 22 is fitted to the inner wall of the air inlet 4 The inner wall, the interior of the air intake port 23 is slidably connected with a sliding window 25, the inner wall of the sliding window 25 is fixedly connected with a filter screen 26, a floating plate 37 is arranged inside the air inlet bin 22, the side of the floating plate 37 close to the air inlet 4 is fixedly connected with a lifting plate 31, the side of the floating plate 37 away from the lifting plate 31 is fixedly connected with a cover plate 39, the bottom of the air inlet bin 22 close to the cover plate 39 is fixedly connected with the main drain pipe 12, the pipe mouth of one end of the main drain pipe 12 is attached to one side of the cover plate 39, the other end of the main drain pipe 12 extends to the outside of the ventilation room 1, and a solenoid valve 29 is arranged in the middle of the main drain pipe 12, the plate body of the floating plate 37 is provided with evenly distributed through holes 40, and the bottom of the floating plate 37 is fixedly connected with two symmetrically arranged heightening strips 38, the ventilation room 1 is installed on the distribution On the side of the power station building, the air inlet 4 faces the inside of the distribution station building, and the air outlet 9 faces the outside of the station building. After starting the duct fan 18, the hot air inside the station building enters the air inlet bin 22 through the air suction port 23, and then is discharged from the station building through the L-shaped pipe 20 and the exhaust bin 8. The circulating air is filtered by the filter 26 to prevent the air pipeline from being blocked. The low-level air suction and high-level air exhaust of the station building are realized by the design of the L-shaped pipe 20's own height and the different directions of the two ends. On the one hand, the demand for extracting hot air from the station building at a low level is solved through the air inlet bin 22. On the other hand, the hot air is discharged from the station building through the high-level exhaust bin 8, which effectively prevents the outside rainwater from penetrating into the station building from a low level. When extremely bad weather occurs, rainwater may be poured into the air inlet bin 2 through the pipe. 2, the air suction port 23 of the air inlet bin 22 is set at the top of its own side, which can block rainwater from flowing into the station house through the side wall of the air inlet bin 22 for a period of time. During this period of time, rainwater seeps through the through hole 40 and gathers under the floating plate 37 raised by the heightening bar 38. As the amount of rainwater gathered in the air inlet bin 22 increases, the floating plate 37 continues to rise under the action of buoyancy. At this time, the lifting plate 31 rises synchronously to block the air suction port 23 to prevent accumulated water from entering the station house. At the same time, the cover plate 39 leaves one side of the main drain pipe 12, and the solenoid valve 29 is controlled to be turned on, so that the accumulated water can be discharged from the main drain pipe 12 to the outside of the station house. Under the premise of ensuring the low-level exhaust and heat dissipation of the device, the function of preventing rainwater from penetrating into the station house and the function of caching and discharging accumulated water in bad weather are realized.

[0030] In the present invention, the inner walls on both sides of the air suction port 23 are provided with sliding grooves 30, and the interiors of the two sliding grooves 30 are slidably connected with limit strips 35. The two limit strips 35 are respectively fixedly connected to the two sides of the sliding window 25, and a pull handle 24 is fixedly connected to the middle position of the top outer wall of the sliding window 25. The sliding window 25 can be removed from the air suction port 23 by pulling the pull handle 24 upward, so that the filter 26 can be disassembled and cleaned. During the movement of the sliding window 25, the limit strip 35 slides along the inner wall of the sliding groove 30 to achieve precise positioning of the sliding window 25.

[0031] In the present invention, an inspection door 5 is hinged at the bottom of one side of the ventilation room 1, a handle 6 is provided on one side of the middle of the inspection door 5, an observation window 7 is provided at the middle position of the top of the inspection door 5, and an inspection door 5 located inside the station building is provided on the side of the ventilation room 1, which is convenient for the staff to inspect the equipment and can prevent rainwater from entering the ventilation room 1 through the inspection door 5. During maintenance, the inspection door 5 can be opened and closed by the handle 6, and the internal state of the ventilation room 1 can be preliminarily observed through the observation window 7.

[0032] In the present invention, a buzzer 3 is fixedly connected to the outer wall of the top of the ventilation room 1, and a tower lamp 2 is fixedly connected to the outer wall of the top of the ventilation room 1, the solenoid valve 29 is connected to a switch through a wire, and the switch is connected to a power supply through a wire, and the buzzer 3 and the tower lamp 2 are both connected in series to the power circuit of the solenoid valve 29. After water enters the air inlet bin 22, the solenoid valve 29 is turned on for drainage, and the tower lamp 2 and the buzzer 3 are started synchronously, and the staff is reminded to make further waterproof inspections and repairs through the transmission of sound and light signals, so as to promptly check for safety hazards.

[0033] In the present invention, a positioning frame 11 is fixedly connected to the outer wall of the ventilation room 1 on the side close to the exhaust port 9, and two fastening ears 14 are fixedly connected to both sides of the positioning frame 11. One side of the positioning frame 11 is in the same plane as the outer wall of the ventilation room 1 on the side close to the exhaust port 9, and a gluing groove 21 is provided on the other side of the positioning frame 11. A sealing strip 15 is bonded at the connection between the exhaust bin 8 and the exhaust port 9. The ventilation room 1 is connected to the side wall of the distribution station house through the fastening ear 14, and the gluing groove 21 is fitted to the outer wall of the distribution station house. Before the installation is completed, sealant is poured into the gluing groove 21, which can enhance the installation effect on the one hand and optimize the waterproof effect on the other hand. The side of the positioning frame 11 with the gluing groove 21 is fitted to the outer wall of the distribution station house, and the contour of the positioning frame 11 is used to assist the positioning of the ventilation room 1 between the distribution station house during the installation process.

[0034] In the present invention, the inner walls on both sides of the ventilation room 1 are fixedly connected with vertically arranged grooved wood sound absorbing panels 19, and the grooved wood sound absorbing panels 19 absorb the noise generated when the duct fan 18 is working.

[0035] In the present invention, an inclined baffle 10 is fixedly connected to the inner wall of the exhaust bin 8 away from the duct fan 18. The baffle 10 serves to shield rainwater on rainy days. The inclined design can prevent rainwater accumulation and backflow, and guide rainwater to flow to the outside of the exhaust bin 8.

[0036] In the present invention, a hanger 17 is fixedly connected to the inner wall of the top of the ventilation room 1, and the outer walls of the bottoms of the three duct fans 18 are in contact with the inner walls of the bottoms of the hangers 17, so that the duct fans 18 are fixed by the hangers 17.

[0037] In the present invention, a secondary drain pipe 13 is inserted into the side of the air inlet bin 22 close to the main drain pipe 12, and a transparent tube 27 is fixedly connected to the top of the secondary drain pipe 13 close to the air inlet bin 22. The transparent tube 27 is connected to the interior of the air inlet bin 22 through the secondary drain pipe 13. A valve 28 is provided in the middle of the secondary drain pipe 13, and the valve 28 is normally closed. The transparent tube 27, the secondary drain pipe 13 and the air inlet bin 22 form a connecting pipe structure, which is convenient for the staff to accurately control the water intake inside the air inlet bin 22 through the water level inside the transparent tube 27.

[0038] In the present invention, the inner wall of the air inlet bin 22 near the air suction port 23 is fixedly connected to the shell 34, the middle position of the top of the shell 34 is fixedly connected to the threaded sleeve 45, the inner thread of the threaded sleeve 45 is connected to the screw rod 44, the bottom of the screw rod 44 is rotatably connected to the upper contact piece 43, the top of the screw rod 44 is fixedly connected to the turntable 36, the top of the lifting plate 31 is fixedly connected to the support rod 32, the top of the support rod 32 is fixedly connected to the striker 33, the top of the striker 33 is threadedly connected to the connecting sleeve 41, the top of the connecting sleeve 41 is fixedly connected to the lower contact piece 42, and the lower contact piece 42 is located at Inside the shell 34, the connecting sleeve 41 and the screw 44 are made of insulating materials, the lower contact piece 42 and the upper contact piece 43 are made of conductive materials, the lower contact piece 42 and the upper contact piece 43 are respectively connected to the two poles of the power supply through wires, and the accumulated water rises, the floating plate 37 and the lifting plate 31 rise synchronously, and the support rod 32 drives the striker 33 to push upward, so that the lower contact piece 42 is upwardly attached to the upper contact piece 43, and the solenoid valve 29, the tower light 2 and the buzzer 3 are controlled to be turned on to the power supply. After the water level drops, the lower contact piece 42 moves downward away from the upper contact piece 43, and the solenoid valve 29, the tower light 2 and the buzzer 3 are disconnected from the power supply.

[0039] When in use, the ventilation room 1 is installed on the side of the power distribution station building, wherein the air inlet 4 faces the inside of the power distribution station building, and the air outlet 9 faces the outside of the station building. After starting the duct fan 18, the hot air inside the station building enters the air inlet bin 22 through the air suction port 23, and then is discharged from the station building through the L-shaped pipe 20 and the air exhaust bin 8. The circulating air is filtered by the filter 26 to prevent the air pipeline from being blocked. Through the height of the L-shaped pipe 20 itself and the design of different directions at both ends, the device can realize low-level suction and high-level exhaust of the station building. On the one hand, the air inlet bin 22 is used to solve the problem of extracting the hot air in the station building at a low level. On the one hand, the hot air is discharged from the station house through the high-positioned exhaust bin 8, which effectively prevents the external rainwater from flowing back into the station house from the low position. When extremely bad weather occurs and there is a possibility that rainwater will flow into the air inlet bin 22 through the pipe, the air inlet 23 of the air inlet bin 22 is set at the top of its side, which can prevent rainwater from flowing into the station house through the side wall of the air inlet bin 22 for a period of time. During this period of time, rainwater seeps through the through hole 40 and gathers under the floating plate 37 raised by the heightening strip 38. As the rainwater gathers more in the air inlet bin 22, the floating plate 37 is 7 continuously rises under the action of buoyancy, at which time the lifting plate 31 rises synchronously to block the air inlet 23 to prevent the accumulated water from entering the station house, and at the same time the cover plate 39 leaves one side of the main drain pipe 12, the floating plate 37 and the lifting plate 31 rise synchronously, the support rod 32 drives the striker 33 to push upward, and the support rod 32 drives the striker 33 to push upward, so that the lower contact piece 42 is upwardly attached to the upper contact piece 43, and the solenoid valve 29, the tower light 2 and the buzzer 3 are turned on to the power supply, so that the accumulated water can be discharged from the main drain pipe 12 to the outside of the station house, and the low-level exhaust and heat dissipation of the device are guaranteed. In order to prevent rainwater from penetrating into the station building and to cache and discharge accumulated water in severe weather, after the water level drops, the lower contact piece 42 moves downward away from the upper contact piece 43, the solenoid valve 29, the tower light 2 and the buzzer 3 are disconnected from the power supply, and the float plate 37 is reset, thereby realizing automatic control of the drainage and alarm functions. By rotating the screw 44 through the turntable 36, the height of the upper contact piece 43 can be adjusted, thereby changing the rising distance required for the lower contact piece 42 to fit to the upper contact piece 43, thereby realizing the control of the water intake required for the alarm and automatic drainage, so that the device can be applied to more different situations and places.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] 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 low-level exhaust and backflow prevention device for a power distribution station, characterized in that: The invention comprises an exhaust bin (8) and three duct fans (18), wherein the three duct fans (18) are fixedly connected in parallel to one side of the exhaust bin (8), and the air outlets of the three duct fans (18) are all connected to the inner cavity of the exhaust bin (8); the outer wall of the exhaust bin (8) is fixedly connected to a ventilation room (1), an exhaust port (9) is provided on the top of one side of the ventilation room (1), and the outer wall of one side of the exhaust bin (8) is in contact with the inner cavity of the exhaust port (9). The three duct fans (18) are fixedly connected to an L-shaped tube (20) on one side away from the exhaust bin (8); the bottom ends of the three L-shaped tubes (20) are fixedly connected to the same air inlet bin (22); a suction port (23) is provided on one side of the top of the air inlet bin (22); an air inlet (4) is provided on the bottom of the ventilation room (1) on the side close to the air inlet bin (22); and the outer wall of the air inlet bin (22) is attached to the inner wall of the air inlet (4). The air inlet (23) is slidably connected to a sliding window (25), the inner wall of the sliding window (25) is fixedly connected to a filter (26), a floating plate (37) is arranged inside the air inlet bin (22), a side of the floating plate (37) close to the air inlet (4) is fixedly connected to a lifting plate (31), and a side of the floating plate (37) away from the lifting plate (31) is fixedly connected to a cover plate (39); the bottom of the air inlet bin (22) close to the cover plate (39) is fixedly connected to a main drain pipe (12), the pipe mouth of one end of the main drain pipe (12) is attached to one side of the cover plate (39), the other end of the main drain pipe (12) extends to the outside of the ventilation room (1), and a solenoid valve (29) is arranged in the middle of the main drain pipe (12), the plate body of the floating plate (37) is provided with evenly distributed through holes (40), and the bottom of the floating plate (37) is fixedly connected to two symmetrically arranged heightening strips (38).

2. A low-level exhaust and backflow prevention device for a power distribution station according to claim 1, characterized in that: The inner walls on both sides of the air inlet (23) are provided with sliding grooves (30), the interiors of the two sliding grooves (30) are slidably connected to limit bars (35), the two limit bars (35) are respectively fixedly connected to the two sides of the sliding window (25), and a pull handle (24) is fixedly connected to the middle position of the top outer wall of the sliding window (25).

3. A low-level exhaust and backflow prevention device for a power distribution station according to claim 1, characterized in that: An inspection door (5) is hinged at the bottom of one side of the ventilation room (1), a handle (6) is provided on one side of the middle of the inspection door (5), and an observation window (7) is provided at the middle position of the top of the inspection door (5).

4. A low-level exhaust and backflow prevention device for a power distribution station according to claim 1, characterized in that: A buzzer (3) is fixedly connected to the outer wall at the top of the ventilation room (1), and a tower light (2) is fixedly connected to the outer wall at the top of the ventilation room (1). The solenoid valve (29) is connected to a switch via a wire, and the switch is connected to a power source via a wire. The buzzer (3) and the tower light (2) are both connected in series to the power circuit of the solenoid valve (29).

5. The low-level exhaust and backflow prevention device for a power distribution station according to claim 1 is characterized in that: The outer wall of the ventilation room (1) close to the exhaust port (9) is fixedly connected to a positioning frame (11), and two fastening ears (14) are fixedly connected to both sides of the positioning frame (11). One side of the positioning frame (11) and the outer wall of the ventilation room (1) close to the exhaust port (9) are in the same plane, and the other side of the positioning frame (11) is provided with a glue groove (21). A sealing strip (15) is bonded to the connection between the exhaust bin (8) and the exhaust port (9).

6. A low-level exhaust and backflow prevention device for a power distribution station according to claim 1, characterized in that: The inner walls on both sides of the ventilation room (1) are fixedly connected with vertically arranged grooved wood sound-absorbing panels (19).

7. A low-level exhaust and backflow prevention device for a power distribution station according to claim 1, characterized in that: An inclined baffle (10) is fixedly connected to the inner wall of the exhaust bin (8) on the side away from the duct fan (18).

8. The low-level exhaust and backflow prevention device for a power distribution station building according to claim 1 is characterized in that: The inner wall at the top of the ventilation room (1) is fixedly connected to a hanger (17), and the outer walls at the bottoms of the three duct fans (18) are in contact with the inner wall at the bottom of the hanger (17).

9. A low-level exhaust and backflow prevention device for a power distribution station according to claim 1, characterized in that: A secondary drainage pipe (13) is inserted into the side of the air inlet bin (22) close to the main drainage pipe (12); a transparent tube (27) is fixedly connected to the top of the secondary drainage pipe (13) close to the air inlet bin (22); the transparent tube (27) is connected to the interior of the air inlet bin (22) through the secondary drainage pipe (13); and a valve (28) is provided in the middle of the secondary drainage pipe (13).

10. A low-level exhaust and backflow prevention device for a power distribution station according to claim 1, characterized in that: The inner wall of the air inlet bin (22) near the air inlet (23) is fixedly connected to a shell (34), a threaded sleeve (45) is fixedly connected to the middle position of the top of the shell (34), the inner thread of the threaded sleeve (45) is connected to a screw rod (44), the bottom of the screw rod (44) is rotatably connected to an upper contact piece (43), the top of the screw rod (44) is fixedly connected to a turntable (36), one side of the top of the lifting plate (31) is fixedly connected to a support rod (32), the top of the support rod (32) is fixedly connected to the support rod (32). A striker (33) is fixedly connected to one side of the housing, a connecting sleeve (41) is threadedly connected to the top of the striker (33), a lower contact piece (42) is fixedly connected to the top of the connecting sleeve (41), the lower contact piece (42) is located inside the housing (34), the connecting sleeve (41) and the screw rod (44) are both made of insulating materials, the lower contact piece (42) and the upper contact piece (43) are both made of conductive materials, and the lower contact piece (42) and the upper contact piece (43) are respectively connected to two poles of a power supply through wires.

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