Apparatus and method for electrical equipment room environmental control

Abstract

This invention relates to a device and method for environmental control in an electrical equipment room, comprising a cable room, with an equipment room isolated at the top of the cable room. An indoor environmental control device is installed on the inner side wall of the equipment room. The indoor environmental control device switches between outdoor air intake and cable room air intake based on actual temperature and humidity, making full use of the low temperature difference cold source to maximize the cooling and humidity control efficiency of the equipment room. Multiple SF6 switches are arranged in an orderly manner in the equipment room, and a control cabinet is arranged on the outside of the side of the SF6 switches. An internal cooling and anti-condensation device is installed on the upper side of the control cabinet. The internal cooling and anti-condensation device has an internal air inlet communicating with the equipment room, an internal air outlet horizontally discharging air into the control cabinet, and a bottom air outlet discharging air downwards into the control cabinet. An internal temperature and humidity sensor is installed at the top of the control cabinet, and a lower temperature and humidity sensor is installed at the bottom of the control cabinet. The internal cooling and anti-condensation device delivers vector air to adjust the temperature difference between the upper and lower parts of the control cabinet in real time, effectively preventing condensation.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment room temperature control devices, in particular to an apparatus and method for environmental control of electrical equipment rooms. Background Art

[0002] A GIS room is usually formed by matching an SF6 switch, an intelligent control cabinet and a high-voltage cable room.

[0003] Since the SF6 gas leaked from the SF6 switch in the GIS room is highly toxic and endangers human life, according to Clause 8.1 of DL408-91 Safety Code for Electric Power Work: power distribution rooms equipped with SF6 equipment must be equipped with powerful ventilation devices, and the air outlet shall be arranged at the bottom of the room to discharge toxic gas outwards; and Clause 8.2 of the code stipulates that the content of SF6 gas in the air of indoor working areas shall not exceed the standard of 1000 ppm. In existing practical applications, when the indoor SF6 strong exhaust fan is turned on, it will generate high-frequency noise that disturbs residents, and negative pressure exhaust will suck in a large amount of dust from the outside; meanwhile, in order to control the indoor temperature of the GIS room, a high-power air conditioner needs to be installed in this super large space for cooling, resulting in great energy waste.

[0004] The intelligent control cabinet matched with the SF6 switch is an online monitoring system cabinet successfully developed by using advanced detection technology, control technology and communication technology. It uses a PLC programmable controller to perform online monitoring and control for enclosed switchgear. The CPU microprocessor in the intelligent control cabinet performs data processing and control, and forms a network to communicate with the central control room automation system. The electronic and electrical equipment in the intelligent control cabinet are arranged in layers, for example, the CPU generates a very large amount of heat.

[0005] Intelligent control cabinets have strict temperature and humidity control requirements. In the prior art, cabinet air conditioners are used for cooling but have high energy consumption. Since the air conditioner cannot meet the humidity control requirements in the cabinet, a dehumidification device is additionally installed in the cabinet; in order to eliminate the condensed water generated by the air conditioner and the dehumidification device, an electric heating water vapor volatilizer is additionally installed. The superimposed single-function devices including the air conditioner, the dehumidification device and the electric heating water vapor volatilizer contradict each other, are unscientific, consume large energy and are unreasonable; in particular, a large temperature difference is formed between the high temperature generated by the CPU and the interlayer of secondary equipment in the cabinet, which easily causes condensation on the PLC secondary equipment and causes misoperation.

[0006] The incoming and outgoing cables of the SF6 switch are led in from the cable room at the lower part of the GIS room. A large number of large-diameter high-voltage cables are arranged in the cable room. Due to the heat emitted by the cables and the low indoor temperature, coupled with the non-circulation of air between the cable room and the outside, the cable room is in a hot and humid state for a long time. Summary of the Invention

[0007] In response to the shortcomings of the existing production technology, the applicant provides an environmental control device and method for an electrical equipment room, which makes full use of the low temperature difference cold source to maximize the cooling and humidity control efficiency of the equipment room, realizes series ventilation and cooling between the equipment room and the cable room, and adjusts the temperature difference between the upper and lower parts of the control cabinet in real time to effectively prevent condensation.

[0008] The technical solution adopted in this invention is as follows:

[0009] An environmental control device for an electrical equipment room includes a cable room, an equipment room is isolated at the top of the cable room, and an indoor environmental control device is installed on the inner side wall of the equipment room.

[0010] The indoor environment control device is equipped with an external air inlet valve that communicates with the outside atmosphere, a top air inlet valve that communicates with the equipment room, and a bottom air inlet valve that communicates with the lower cable room. It also includes a sensor assembly that can provide feedback on temperature and humidity. Under the action of the main fan, the indoor environment control device draws air into the equipment room through the main air outlet. The cable room has an external air inlet on its side wall that communicates with the outside atmosphere.

[0011] The equipment room is equipped with multiple SF6 switches arranged in an orderly manner. Control cabinets are arranged on the outside of the sides of the SF6 switches. Cooling and anti-condensation devices are installed on the upper side of the control cabinets. Temperature and humidity sensors are installed at the top inside the control cabinets and at the bottom inside the cabinets.

[0012] As a further improvement to the above technical solution:

[0013] The control cabinets are arranged along the length of one inner wall of the equipment room. The indoor environmental control devices are located on the opposing inner walls of the equipment room on both sides of the control cabinets, or the indoor environmental control devices are located on the inner wall of the equipment room opposite to the control cabinets. Each control cabinet facing the SF6 switch is equipped with an internal cooling and anti-condensation device.

[0014] An SF6 gas vent and an SF6 exhaust fan outlet are provided on the lower part of the side wall of the equipment room opposite to the control cabinet. An SF6 exhaust fan is installed at the SF6 exhaust fan outlet. An upper exhaust vent is provided on the upper part of the same side wall of the equipment room above the SF6 exhaust fan. An upper exhaust fan is installed at the upper exhaust vent.

[0015] Cables electrically connected to the equipment in the equipment room are laid in an orderly manner in the cable room; a fireproof smoke damper is installed below the bottom air inlet valve of the indoor environmental control device, and an exhaust pipe is connected below the fireproof smoke damper; the outdoor air inlet of the cable room is located on the side wall of the cable room away from the exhaust pipe, and an air filter is installed on the inner side of the outdoor air inlet of the cable room.

[0016] The structure of the indoor environment control device is as follows: it includes a housing, an external air inlet valve is installed on the upper part of one side of the housing, and a main air outlet is opened on the lower part of the opposite side of the housing; an air filter is installed inside the housing located below the top air inlet valve and inside the external air inlet valve, and a main fan is installed inside the housing located below the air filter, and the main fan is connected to the main air outlet through a silencer elbow.

[0017] An indoor environment controller is installed on the side wall of the housing above the main air outlet; a flow guide device is installed at the main air outlet.

[0018] Each control cabinet has equipment including a PLC and CPU installed on its upper part. On the upper side of the control cabinet, facing the equipment, there is a cabinet cooling and anti-condensation device. The cabinet cooling and anti-condensation device has two or more air outlets at intervals above and below the equipment. Each cabinet air outlet is equipped with a fan.

[0019] The structure of the cabinet cooling and anti-condensation device is as follows: it includes an outer shell, one side of which is set as an air inlet communicating with the equipment room, and an air filter is installed inside the air inlet. An air outlet is opened on the opposite side of the outer shell. It also includes a vertically arranged return air duct, which is arranged in the middle of the inner side of the outer shell, on one side, or symmetrically on the two inner sides of the outer shell. The top of the return air duct is connected to the return air port, which communicates with the inside of the control cabinet. A return air fan is installed in each return air duct, and the bottom of the return air duct is connected to the bottom air outlet.

[0020] A control method for the above-mentioned electrical equipment room environmental control device includes the following steps:

[0021] S1. Turn on the indoor environment control device;

[0022] S2. The indoor environmental control device draws air from outside the equipment room and brings it into the equipment room;

[0023] S3. The airflow delivered by the indoor environmental control device flows along the inner bottom surface of the equipment room toward the control cabinet. After rebounding from the control cabinet, the airflow flows in a fan shape toward the SF6 switch and passes through the gap of the SF6 switch.

[0024] S4. This pushes SF6 gas, which is heavier than air, out of the SF6 gas vent near the inner bottom and the SF6 exhaust fan outlet. The hot and humid air in the equipment room rises under the action of airflow and is discharged to the outside from the upper exhaust fan outlet.

[0025] The S5, S2-S4 cycle works.

[0026] As a further improvement to the above technical solution:

[0027] The steps for controlling the indoor temperature and humidity of the equipment using the indoor environment control device include:

[0028] Equipment room temperature control method: Outside air enters the cable room through the cable outdoor air inlet, and then enters the indoor environmental control device through the air duct and bottom air inlet valve. Under the action of the main fan, the air is delivered to the equipment room through the main air outlet. The airflow in the equipment room is discharged to the outside through the SF6 gas vent located at the lower part of the equipment room wall, the external SF6 exhaust fan outlet, and the upper exhaust fan outlet on the upper part of the wall, forming a series ventilation and cooling system for the cable room and the equipment room. When the detected temperature of the outdoor sensor is lower than the detected temperature of the cable layer sensor, the bottom air inlet valve of the indoor environmental control device is closed and the external air inlet valve is opened, so that air is delivered from the outside to the equipment room.

[0029] Equipment room humidity control method: When the humidity in the cable room and the outside is higher than the set value of the equipment room humidity, open the one with the lower humidity in the outdoor air inlet valve and the bottom air inlet valve in the indoor environment control device, and at the same time open the top air inlet valve. The outdoor air inlet and the indoor internal circulation are connected in parallel to supply air to the equipment room to maintain a slight positive pressure.

[0030] The steps for controlling the temperature and humidity inside the control cabinet using the cooling and anti-condensation device include:

[0031] When the temperature and humidity sensor inside the cabinet detects a higher value than the temperature and humidity sensor at the bottom, and the difference exceeds a set value, the return air fan is turned on. Air is then sent from the bottom air outlet through the return air duct to the lower part of the control cabinet, causing the air inside the control cabinet to circulate and thus balancing the temperature and humidity inside the control cabinet.

[0032] The beneficial effects of this invention are as follows:

[0033] This invention features a compact and rational structure. An indoor environmental control device switches between outdoor and cable room air intake based on actual temperature and humidity, fully utilizing the low-temperature difference cold source to maximize the cooling and humidity control efficiency of the equipment room. This eliminates the need for exhaust fans, avoiding noise pollution and meeting safety operation standards. It also reduces air conditioning usage, saving energy. Furthermore, it achieves series ventilation and cooling between the equipment room and the cable room. Simultaneously, an in-cabinet cooling and anti-condensation device delivers vector airflow within the control cabinet, automatically adjusting the temperature difference between the upper and lower parts of the cabinet in real time to achieve ventilation, cooling, and humidity control, effectively preventing condensation. Thus, it achieves integrated environmental control of the electrical equipment room, ensuring safety, reliability, energy efficiency, and environmental friendliness.

[0034] The present invention also includes the following advantages:

[0035] The indoor environmental control device changes the airflow direction through side springs, achieving convective ventilation and cooling within the equipment room to maintain a relatively balanced temperature gradient. On one hand, the lower horizontal airflow flows close to the bottom surface, effectively expelling SF6 gas, which is heavier than air, outdoors, ensuring that the gas concentration in the equipment room meets safety requirements and guaranteeing personal safety. On the other hand, the supply airflow, under the action of flow pressure, causes hot and humid air to rise and be discharged outdoors. Thus, while expelling SF6 gas, the indoor environmental control device effectively reduces the temperature and humidity inside the equipment room.

[0036] The cable room uses filtered outdoor air intake, making full use of the cool summer advantage of the basement. The cable room and equipment room are connected in series for ventilation, cooling and humidity control, which effectively regulates the environment inside the cable room while ensuring the environmental control inside the equipment room. Attached Figure Description

[0037] Figure 1 This is a top view of the equipment room of the present invention.

[0038] Figure 2 This is a side view of the equipment room of the present invention.

[0039] Figure 3 This is a top view of the equipment room in another embodiment of the present invention.

[0040] Figure 4 This is a side view of the equipment room in another embodiment of the present invention.

[0041] Figure 5 This is a side sectional view of the indoor environment control device of the present invention.

[0042] Figure 6 for Figure 5 The left view.

[0043] Figure 7 This is a schematic diagram of the control cabinet of the present invention.

[0044] Figure 8 This is a side sectional view of the cabinet cooling and anti-condensation device of the present invention.

[0045] Figure 9 for Figure 8 The left view.

[0046] Figure 10 This is a schematic diagram of another layout structure of the return air duct in the cabinet cooling and anti-condensation device of the present invention.

[0047] Figure 11 for Figure 10 Side view.

[0048] Figure 12 This is a schematic diagram of the lifting mechanism of the present invention.

[0049] The components include: 1. Equipment room; 2. Control cabinet; 3. Indoor environmental control device; 4. Cabinet cooling and anti-condensation device; 5. SF6 switch; 6. Fireproof smoke damper; 7. Exhaust duct; 8. Cable room; 10. Ground.

[0050] 11. External exhaust fan for SF6; 12. Upper exhaust fan; 13. SF6 gas vent;

[0051] 21. Lower temperature and humidity sensor; 22. Hot air outlet; 23. Internal temperature and humidity sensor; 24. External temperature and humidity sensor;

[0052] 30. Housing; 31. Indoor environment controller; 32. Main fan; 320. Silencing elbow; 33. Main air outlet; 330. Air guide vane; 34. Cable layer sensor; 35. Bottom air inlet valve; 36. Outdoor sensor; 37. External air inlet valve; 370. Air filter; 38. Top air inlet valve; 39. Indoor sensor;

[0053] 40. Outer casing; 400. Air guide vane; 41. Bottom air outlet; 42. Downward fan; 43. Cabinet controller; 44. Upward fan; 45. Return air outlet; 46. Return air duct; 461. Return air fan; 47. Cabinet air inlet; 471. Air filter; 48. Lifting mechanism; 481. Slide rail; 482. Lifting support shell; 483. Screw; 484. Turbine nut; 485. Worm gear; 486. Protective shell;

[0054] 81. Outdoor air inlet for cable; 82. Air filter; 83. Cable; 84. Smoke sensor. Detailed Implementation

[0055] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0056] like Figure 1 and Figure 2 As shown, an electrical equipment room environment control device of this embodiment includes a cable room 8 sunken into the ground 10, an equipment room 1 isolated on the top of the cable room 8, and an indoor environment control device 3 installed on the inner side wall of the equipment room 1.

[0057] like Figure 5As shown, the indoor environment control device 3 is equipped with an external air inlet valve 37 that communicates with the outside atmosphere, a top air inlet valve 38 that communicates with the inside of the equipment room 1, and a bottom air inlet valve 35 that communicates with the lower cable room 8. It also includes a sensor assembly that can provide feedback on temperature and humidity. The sensor assembly includes an outdoor sensor 36, an indoor sensor 39, and a cable layer sensor 34 that correspond to the external air inlet valve 37, the top air inlet valve 38, and the bottom air inlet valve 35, respectively. Under the action of the main fan 32, the indoor environment control device 3 draws air into the equipment room 1 through the main air outlet 33. The cable room 8 has an outdoor cable air inlet 81 that communicates with the outside atmosphere on its side wall.

[0058] In this embodiment, the indoor environment control device 3 switches between outdoor air intake and cable room 8 air intake based on the actual temperature and humidity through the opening and closing of the external air intake valve 37 and the bottom air intake valve 35. This fully utilizes the low temperature difference cold source, maximizes the cooling and humidity control efficiency in the equipment room 1, meets the requirements of safe operation specifications, avoids noise pollution from the fan exhaust, reduces the use of air conditioning, saves energy, and also realizes series ventilation and cooling between the equipment room 1 and the cable room 8.

[0059] Multiple SF6 switches 5 are arranged in an orderly manner in equipment room 1. Control cabinets 2 are arranged on the outside of the sides of the SF6 switches 5. Cooling and anti-condensation devices 4 are installed on the upper side of the control cabinets 2. Figure 8 As shown, the cabinet cooling and anti-condensation device 4 is equipped with: an air inlet 47 communicating with the equipment room 1, an air outlet 47 that horizontally discharges air into the control cabinet 2, and a bottom air outlet 41 that discharges air downwards into the control cabinet 2; an internal temperature and humidity sensor 23 is installed at the top of the control cabinet 2, and the internal temperature and humidity sensor 23 is installed at the top of the cabinet cooling and anti-condensation device 4; a lower temperature and humidity sensor 21 is installed at the bottom of the internal temperature and humidity device 4.

[0060] In this embodiment, combined with the monitoring of the cabinet internal temperature and humidity sensor 23 and the lower temperature and humidity sensor 21, the cabinet internal cooling and anti-condensation device 4 delivers air vertically and vertically within the control cabinet 2, automatically adjusting the temperature difference between the upper and lower parts of the control cabinet 2 in real time, thereby achieving ventilation, cooling, and humidity control, reducing the temperature difference, and effectively preventing the generation of condensation.

[0061] The control cabinets 2 are arranged along the length of one inner wall of the equipment room 1. Each control cabinet 2 facing the SF6 switch 5 is equipped with an internal cooling and anti-condensation device 4 to control the temperature of the equipment room 1 within the set range, effectively ensuring the effectiveness and reliability of cooling by supplying air to the inside of the control cabinet 2 through the internal cooling and anti-condensation device 4.

[0062] exist Figure 1 and Figure 2In one embodiment shown, the indoor environment control device 3 is located on the inner wall of the equipment room 1 on both sides of the control cabinet 2; the indoor environment control device 3 directs the airflow toward the control cabinet 2, and the airflow bounces back through the control cabinet 2 and flows toward the SF6 switch 5. The positive pressure airflow pushes the SF6 gas out of the SF6 gas outlet 13 and the external SF6 fan outlet to be discharged outdoors.

[0063] exist Figure 3 and Figure 4 In another embodiment shown, the indoor environment control device 3 is located on the inner wall of the equipment room 1 opposite to the control cabinet 2; the airflow sent by the indoor environment control device 3 bounces off the inner wall of the equipment room 1 and flows to the control cabinet 2, and then bounces off the control cabinet 2 and flows to the SF6 switch 5, which can ultimately eliminate the dead corner of ventilation at the bottom of the room and cause the SF6 gas driven by the airflow to be discharged outdoors from the SF6 gas outlet 13 and the external SF6 fan outlet.

[0064] An SF6 gas vent 13 and an external SF6 exhaust fan outlet are provided on the side wall of the equipment room 1, which is located opposite to the control cabinet 2, near the ground. The SF6 gas vent 13 is used to eliminate the accumulation of gas caused by ventilation dead corners. An external SF6 exhaust fan 11 is installed at the external SF6 exhaust fan outlet. An upper exhaust vent is opened on the upper part of the same side wall of the equipment room 1 above the external SF6 exhaust fan 11, and an upper exhaust fan 12 is installed at the upper exhaust vent.

[0065] In this embodiment, the SF6 gas exhaust port 13, the external SF6 fan port, and the upper exhaust port are respectively located on the upper and lower parts of the same side wall of the equipment room 1. This facilitates the smooth and timely discharge of SF6 gas, which is heavier than air, through the external SF6 fan port, while hot and humid air can be smoothly discharged through the upper exhaust port after rising.

[0066] In this embodiment, the air supply of the indoor environment control device 3 changes the airflow direction through the side spring, and ventilates and cools the equipment room 1 by upward convection, maintaining a relatively balanced temperature gradient. On the one hand, the lower horizontal airflow flows close to the bottom surface, effectively pushing SF6 gas, which is heavier than air, to be discharged outdoors, so that the gas concentration in the equipment room 1 meets the safety requirements and ensures personal safety. On the other hand, the supply airflow, under the combined action of flow pressure and hot floating gas flow, causes the hot and humid air to rise and be discharged outdoors. Thus, the indoor environment control device 3 effectively reduces the indoor temperature and humidity of the equipment room 1 while discharging SF6 gas.

[0067] Cables 83, which are electrically connected to the equipment in equipment room 1, are laid in an orderly manner in cable room 8; a fireproof smoke damper 6 is installed below the bottom air inlet valve 35 of the indoor environmental control device 3, and an exhaust pipe 7 is connected below the fireproof smoke damper 6; the outdoor air inlet 81 of the cable is located on the side wall of the cable room 8 away from the exhaust pipe 7, and an air filter device 82 is installed inside the outdoor air inlet 81 of the cable.

[0068] Cable compartment 8 uses filtered outdoor air intake, making full use of the cool summer advantage of the basement. Cable compartment 8 is connected in series with equipment compartment 1 for ventilation, cooling and humidity control. While ensuring the environmental control in equipment compartment 1, the environment in cable compartment 8 is effectively regulated.

[0069] Several smoke sensors 84 are installed at the top of the cable room 8. The smoke sensors 84 are located near the fireproof smoke damper 6. If smoke or fire occurs in the cable room 8, the smoke sensors 84 will activate and close all bottom air inlet valves 35 and main fans 32, thus isolating the upper equipment room 1 from the lower cable room 8. Once the fire is over, the bottom air inlet valves 35 and main fans 32 will be opened.

[0070] like Figure 5 and Figure 6 As shown, the structure of the indoor environmental control device 3 is as follows: it includes a housing 30, an external air inlet valve 37 is installed on the upper part of one side of the housing 30, and a main air outlet 33 is opened on the lower part of the opposite side of the housing 30; an air filter 370 is installed inside the housing 30 located below the top air inlet valve 38 and inside the external air inlet valve 37, and a main fan 32 is installed inside the housing 30 located below the air filter 370. The main fan 32 is connected to the main air outlet 33 through a silencer elbow 320, thereby effectively ensuring that the air delivered to the equipment room 1 is close to the inner bottom surface, realizing the passive discharge of SF6 gas with a higher specific gravity.

[0071] An indoor environment controller 31 is installed on the side wall of the housing 30 above the main air outlet 33;

[0072] like Figures 5-6 As shown, a flow guide device that can periodically swing left and right is installed at the external air inlet valve 37, top air inlet valve 38, bottom air inlet valve 35, and main air outlet 33 to adjust the direction of the airflow, such as adjusting the proportion of airflow from the main air outlet 33 flowing to the control cabinet 2.

[0073] The flow guiding devices at the external air inlet valve 37, top air inlet valve 38, bottom air inlet valve 35, and main air outlet 33 are angled by the flow guiding plate actuator, so that the flow guiding device swings left and right to change the air supply direction, and the rebound airflow flows in a fan shape towards the SF6 gas discharge port 13.

[0074] like Figure 7As shown, a single control cabinet 2 has equipment including a PLC and a CPU stacked on top inside. The PLC generates less heat, while the CPU generates more heat. A cooling and anti-condensation device 4 is installed on the upper side of the control cabinet 2, directly facing the equipment. The cooling and anti-condensation device 4 has two or more air outlets at intervals above and below the equipment. Each air outlet is equipped with a fan, which directs the airflow to the local high-temperature area of ​​the equipment's interlayer. A hot air outlet 22 is installed on the top or top of each control cabinet 2 to facilitate the discharge of hot and humid gas from the cabinet after it rises.

[0075] In this embodiment, as Figure 8 As shown, two air outlets can be opened on the side of the cabinet facing the equipment for the cooling and anti-condensation device 4. An upper fan 44 and a lower fan 42 are respectively installed at the air outlets. The operation of the upper fan 42 and the lower fan 44 will direct the airflow to the corresponding equipment layer.

[0076] In this embodiment, an external temperature and humidity sensor 24 is installed in the area outside the control cabinet 2 where the internal cooling and anti-condensation device 4 is located. The external temperature and humidity sensor 24 is installed at the bottom of the internal cooling and anti-condensation device 4. The external temperature and humidity sensor 24 monitors and provides feedback on the temperature and humidity of the equipment room 1 outside the control cabinet 2.

[0077] like Figure 8 As shown, the structure of the cabinet cooling and anti-condensation device 4 is as follows: it includes an outer shell 40, one side of the outer shell 40 is configured as an air inlet 47 communicating with the equipment room 1, an air filter 471 is installed inside the air inlet 47, and an air outlet is opened on the opposite side of the outer shell 40; it also includes a vertically arranged return air duct 46, a return air fan 461 is installed in each return air duct 46, and the bottom end of the return air duct 46 is connected to the bottom air outlet 41.

[0078] In this embodiment, due to the setting of the return air duct 46, when the return air fan 461 is working, air is sent downward from the bottom through the air outlet 41 at the bottom of the return air duct 46. The return airflow is pressed into the lower space inside the control cabinet 2, forming an airflow circulation inside the control cabinet 2. The circulation of airflow from top to bottom reduces the temperature and humidity difference between the upper and lower parts of the cabinet, thereby achieving a temperature and humidity balance inside the cabinet and solving the condensation problem.

[0079] In this embodiment, an in-cabinet controller 43 can be installed on the outer casing 40. The in-cabinet controller 43 is electrically connected to each fan and sensor to perform real-time adjustment and control.

[0080] exist Figure 8 and Figure 9In the embodiment shown, the return air duct 46 is arranged in the middle of the interior of the outer casing 40. The top of the return air duct 46 is connected to the return air inlet 45, which is connected to the interior of the control cabinet 2. When the return air fan 461 is working, the airflow inside the control cabinet 2 is introduced into the return air duct 46 and sent to the lower part of the control cabinet 2 through the bottom air outlet 41 at the bottom of the return air duct 46, so as to realize the circulation of airflow inside the control cabinet 2.

[0081] exist Figure 10 and Figure 11 In the illustrated embodiment, return air ducts 46 can also be symmetrically arranged on the two inner sides of the outer casing 40. Each return air duct 46 is equipped with a return air fan 461. The top of the return air duct 46 is connected to a return air inlet 45 that communicates with the inside of the control cabinet 2, thereby guiding the airflow introduced by the return air inlet 45 into the return air duct 46, and then sending it to the lower part of the control cabinet 2 through the bottom air outlet 41 at the bottom of the return air duct 46, which helps to achieve the circulation of airflow in the control cabinet 2. The two return air ducts 46 and the two return air fans 461 are linked in an alternating manner, which can make the temperature difference in the control cabinet 2 smaller and the effect better.

[0082] Alternatively, the return air duct 46 can be installed on one side of the outer casing 40. Each return air duct 46 is equipped with a return air fan 461. The top of the return air duct 46 is connected to the return air inlet 45, which communicates with the inside of the control cabinet 2. This allows the airflow introduced from the return air inlet 45 to be directed into the return air duct 46 and then delivered to the bottom of the control cabinet 2 via the bottom air outlet 41 at the bottom of the return air duct 46, thus helping to achieve the circulation of airflow within the control cabinet 2.

[0083] The cooling and anti-condensation device 4 inside the cabinet is equipped with air guide vanes 400 at the air outlet inside the cabinet to further direct the airflow; each air guide vane 400 can be opened and closed independently or its angle can be adjusted to deliver the ventilation airflow to the heat-generating parts.

[0084] The fan current can also be adjusted proportionally according to the actual air outlet area, so that the flow rate and air volume of the local air outlet remain basically unchanged. This method can reduce the fan energy consumption and achieve the purpose of target cooling of each local heat source.

[0085] By using the cabinet cooling and anti-condensation device 4 in this embodiment, the temperature inside the control cabinet 2 can be reduced to within 3℃ of the inlet air temperature. When the temperature in the equipment room 1 is controlled at 37℃, the temperature inside the control cabinet 2 is ≤40℃ and the temperature difference between the upper and lower parts of the control cabinet 2 is <3℃; which is far lower than the industry standard requirements of 55℃ for the cabinet temperature and 10℃ for the temperature difference between the upper and lower parts of the cabinet.

[0086] Alternatively, one set of air outlets and their guide vanes 400 can be installed on the outer casing 40 via a lifting mechanism 48. This allows the air outlets to be adjusted to a suitable height via the lifting mechanism 48, making them more suitable for vector air supply cooling of the equipment inside the control cabinet 2.

[0087] like Figure 12 As shown, the structure of the lifting mechanism 48 can be configured as follows: a sliding groove 481 is provided on the wall of the outer casing 40, and a lifting support shell 482 is slidably mounted on the sliding groove 481. The air outlet and air guide vane 400 inside the cabinet are installed on the lifting support shell 482. A screw 483 is installed downward at the bottom of the lifting support shell 482, and a worm nut 484 is screwed on the screw 483. The outer circumferential surface of the worm nut 484 meshes with a worm gear 485, and the worm gear 485 is rotatably mounted on the outer casing 40. When adjustment is required, force is applied to the worm gear 485 to make it rotate, which drives the worm nut 484 to rotate, causing the screw 483 threadedly engaged with the worm nut 484 to move up and down, thereby driving the lifting support shell 482 to move up and down relative to the outer casing 40 along the sliding groove 481, thereby realizing the vertical height adjustment of the air outlet inside the cabinet. Of course, a protective shell 486 can be installed on the inner wall of the outer casing 40 to shield and protect the transmission structure of the lifting mechanism 48, depending on the actual situation.

[0088] The control method of the electrical equipment room environment control device in this embodiment includes the following steps:

[0089] S1. Turn on indoor environmental control device 3;

[0090] S2. The indoor environmental control device 3 draws air from outside the equipment room 1 and brings it into the equipment room 1;

[0091] S3. The airflow delivered by the indoor environmental control device 3 flows along the inner bottom surface of the equipment room 1 towards the control cabinet 2. After being bounced off the control cabinet 2, the airflow flows in a fan shape towards the SF6 switch 5 and through the gap of the SF6 switch 5. The fan-shaped airflow agitates and dilutes the SF6 leaked gas before flowing towards the SF6 gas discharge port 13.

[0092] S4. This pushes SF6 gas, which is heavier than air, out of the SF6 gas outlet 13 near the inner bottom surface and the SF6 exhaust fan outlet. The hot and humid air in the equipment room 1 rises under the action of airflow and is then discharged to the outside by the upper exhaust fan 12.

[0093] The S5, S2-S4 cycle works.

[0094] The indoor environment control device 3 compares the temperature and humidity parameters inside and outside the equipment room 1 and inside the cable room 8 to formulate the optimal temperature control strategy. It operates continuously throughout the year to ventilate the equipment room 1 and selects to adopt outdoor air intake, air intake from the cable room 8, or a parallel ventilation mode of external air intake and internal circulation.

[0095] The indoor environment control device 3 delivers vector air to the control cabinet 2 via the guide plate 330 installed at the main air outlet 33. The airflow delivered by the indoor environment control device 3 is dispersed by the side of the control cabinet 2, passes through the gap between the SF6 switches 5, and moves in a fan shape toward the exhaust SF6 fan outlet at the lower part of the side wall of the equipment room 1.

[0096] The airflow rate delivered by the indoor environmental control device 3 increases with the increase of the temperature difference between the inside and outside of the equipment room 1. At the same time, when the airflow rate increases, the rebound angle of the airflow in the control cabinet 2 increases accordingly, so that the airflow is in a fan-shaped dynamic change state.

[0097] The specific steps for controlling the temperature and humidity inside equipment room 1 using indoor environmental control device 3 include:

[0098] 1) Temperature control method in equipment room 1: External air enters cable room 8 through cable outdoor air inlet 81, and is drawn from the low-temperature zone at the bottom of cable room 8 through air duct 7 into the bottom air inlet valve 35 and then into indoor environmental control device 3. Under the action of main fan 32, air is delivered into equipment room 1 through main air outlet 33. The airflow in equipment room 1 is discharged to the outside through SF6 gas vent 13 set at the lower part of the wall of equipment room 1, external SF6 exhaust fan 11, and upper exhaust fan 12 on the upper part of the wall, forming a series ventilation and cooling system for cable room 8 and equipment room 1. When the detected temperature of outdoor sensor 36 is lower than the detected temperature of cable layer sensor 34, the bottom air inlet valve 35 of indoor environmental control device 3 is closed and the external air inlet valve 37 is opened to deliver air from the outside into equipment room 1.

[0099] During use, depending on actual needs, the indoor air can be supplied with cold air during the day-night temperature difference period in summer, and the indoor air can be heated by the temperature difference when the daytime temperature is higher than the indoor temperature during winter.

[0100] During periods of low outdoor temperature, such as winter, the indoor environmental control device 3 can use the cable compartment 8 to draw air from the equipment room 1 to provide temperature-controlled variable air supply. Low-frequency, small-volume air supply maintains positive pressure in the equipment room 1, allowing SF6 leaked gas to escape in time and maintaining a balanced temperature difference in the equipment room 1, unaffected by the low external temperature. When the outdoor temperature is higher than the cable compartment 8 temperature, for example, more than 2°C, the external air inlet valve 37 can be opened to use the outdoor temperature difference to raise the temperature in the equipment room 1. When the outdoor temperature returns to the same level as the cable compartment 8 temperature, the external air inlet valve 37 is closed and the bottom air inlet valve 35 is opened to allow air to enter the cable compartment 8.

[0101] During periods of high outdoor temperatures, such as in summer, when the temperature inside equipment room 1 is greater than 28°C and the outdoor temperature is 3°C lower than the temperature inside equipment room 1 or 1°C lower than the temperature inside cable room 8, the external air inlet valve 37 is opened and the bottom air inlet valve 35 is closed to draw air from the outside to cool equipment room 1. When the outdoor temperature rises to the same temperature as cable room 8, the external air inlet valve 37 is closed and the bottom air inlet valve 35 is opened to supply air to equipment room 1 through cable room 8.

[0102] During periods of high outdoor temperatures, the equipment room 1 is ventilated, cooled, and cooled by utilizing the low-temperature period of the day-night temperature difference, so that the temperature of the equipment room 1 can be controlled at 37℃, which meets the requirement of ≤40℃ in the specification.

[0103] When using 500m 3 ~1250m 3 The cable room 8 serves as a cold storage pool, utilizing the natural cold source of the basement. The bottom of the cable room 8 has the lowest temperature. The indoor environmental control device 3 draws air from the lowest low-temperature zone of the cable room 8 through the air duct 7 and sends it to the equipment room 1 above, maintaining a balanced temperature and humidity, which is lower than the summer ventilation and cooling requirements of the equipment room 1. This cascade ventilation method also ventilates, cools, and exchanges air in the cable room 8 while supplying air to the equipment room 1. An air filter device 82 is installed above the zero elevation of the cable room 8 to keep the cable room 8 clean. A fireproof smoke damper 6 with fault-resistant fire prevention is installed at the connection between the bottom air inlet of the indoor environmental control device 3 and the top of the cable room 8, which is closed by temperature control fuse.

[0104] 2) Humidity control method in equipment room 1: When the humidity in cable room 8 and the outside is higher than the humidity setting value in equipment room 1, open the one with the lower humidity, either the external air inlet valve 37 or the bottom air inlet valve 35 in the indoor environment control device 3, and at the same time open the top air inlet valve 38. The external air inlet and the indoor internal circulation are connected in parallel to supply air to equipment room 1 to maintain a slight positive pressure in the room and exhaust the SF6 gas in equipment room 1. Thus, based on the real-time humidity data, the outdoor air inlet or cable room air inlet working mode can be selected after comparison and optimization.

[0105] The airflow delivered by the main air outlet 33 of the indoor environmental control device 3 flows along the inner bottom surface of the equipment room 1 toward the control cabinet 2. After being bounced off the control cabinet 2, it flows toward the SF6 switch 5. It flows through the gap of the SF6 switch 5 and pushes the SF6 gas, which is heavier than air, to be discharged from the external exhaust SF6 fan 11 near the inner bottom surface. The hot and humid air in the equipment room 1 rises under the action of the airflow and is discharged to the outside from the upper exhaust fan 12.

[0106] In practical use, the operation of the indoor environmental control device 3 can be set according to the actual situation, based on the monitored values ​​of humidity in the cable room 8 and outdoor humidity. For example:

[0107] When the outdoor ambient humidity is greater than 90%, the indoor environment control device 3 opens the bottom air inlet valve 35 and the top air inlet valve 38 at the same time to prevent outdoor high temperature gas from entering the cable chamber 8 and entering the equipment chamber 1 by means of partial internal circulation. It also helps to maintain a slight positive pressure in the cable chamber 8 by allowing a small amount of air to enter, which is conducive to the overflow of SF6 leakage gas.

[0108] When the humidity in the cable room is greater than 85% and the outdoor humidity is greater than 90%, the indoor environmental control device 3 closes the bottom air inlet valve 35 and opens the top air inlet valve 38, briefly using the circulation mode in the equipment room 1.

[0109] When the humidity in the cable room is ≤80%, the indoor environment control device 3 closes the top air inlet valve 38 and resumes air intake from the cable room 8;

[0110] During the hot season, the indoor humidity of Equipment Room 1 is ≥75% (adjustable). If the outdoor humidity is <70% (adjustable) and the temperature is <the room temperature of Equipment Room 1, open the outdoor air inlet valve 37 to bring in outdoor air and reduce the indoor humidity and temperature.

[0111] In this embodiment, the natural cold source of the cable room 8 in summer can be selectively used for ventilation, or two ventilation methods can be adopted: outdoor day and night temperature difference, low temperature or low humidity period. This maximizes the cooling efficiency while adding a humidity control ventilation mode to achieve temperature and humidity control in the equipment room 1 and the cable room 8. The use of natural cold sources eliminates the need to install air conditioning or turn on fans for cooling, which is energy-saving and environmentally friendly.

[0112] In this embodiment, while the indoor environment control device 3 achieves cooling and humidity control in the equipment room 1, it also solves the problem of SF6 leaked gas accumulating indoors, and can promptly discharge it outdoors, reliably eliminating the potential harm of toxic gas to the human body.

[0113] The specific steps for controlling the temperature and humidity inside the control cabinet 2 using the internal cooling and anti-condensation device 4 include:

[0114] When the monitoring value of the temperature and humidity sensor 23 inside the cabinet is higher than the monitoring value of the temperature and humidity sensor 21 at the bottom, and the difference exceeds the set value, the return air fan 461 is turned on, and air is sent from the bottom air outlet 41 through the return air duct 46 to the lower part of the control cabinet 2, causing the air inside the control cabinet 2 to be agitated.

[0115] In actual use, the operation of the cooling and anti-condensation device 4 inside the cabinet can be set according to the actual situation, based on the monitoring values ​​of the internal temperature and humidity sensor 23 and the lower temperature and humidity sensor 21. For example:

[0116] When the ambient temperature inside control cabinet 2 is below 25℃, the fan connected to the air outlet inside the control cabinet 2 will stop working; however, the internal circulation mode will be activated according to the temperature difference between the top and bottom of the cabinet. For example, if the temperature difference between the top and bottom of the cabinet is >8℃, the internal circulation will be activated, and if it is <4℃, the internal circulation will be activated.

[0117] When the temperature inside cabinet 2 reaches 30℃, the ventilation and cooling mode is activated, and the air volume is adjusted by temperature control. When the temperature difference between the top and bottom of the cabinet is greater than 8℃, the internal circulation mode is activated, and when it is less than 4℃, the internal circulation mode is deactivated.

[0118] When the temperature inside cabinet 2 of the control cabinet reaches 30℃ or above, the ventilation and cooling mode and the internal circulation mode will be activated, which can be automatically turned on and off and adjusted according to needs.

[0119] In this embodiment, the cooling and anti-condensation device 4 inside the control cabinet 2 uses the self-heating of the electrical equipment inside the cabinet to control the humidity inside the control cabinet 2 to below 75% by means of ventilation cooling and regulating the temperature difference of the cabinet's tiers.

[0120] This invention can make full use of the low temperature difference cold source to maximize the cooling and humidity control efficiency of the equipment room, realize the series ventilation and cooling of the equipment room and the cable room, and adjust the temperature difference between the upper and lower parts of the control cabinet in real time to effectively prevent condensation. Thus, it realizes the integrated environmental control of the electrical equipment room, which is safe, reliable, energy-saving and environmentally friendly.

[0121] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. An environmental control device for an electrical equipment room, characterized in that: It includes a cable room (8), an equipment room (1) is isolated on the top of the cable room (8), and an indoor environmental control device (3) is installed on the inner wall of the equipment room (1). The indoor environment control device (3) is provided with an external air inlet valve (37) that communicates with the outside atmosphere, a top air inlet valve (38) that communicates with the inside of the equipment room (1), and a bottom air inlet valve (35) that communicates with the lower cable room (8). It also includes a sensor assembly that can provide feedback on temperature and humidity. Under the action of the main fan (32), the indoor environment control device (3) draws air into the equipment room (1) through the main air outlet (33). The cable room (8) is provided with an external cable inlet (81) that communicates with the outside atmosphere on the side wall. Multiple SF6 switches (5) are arranged in an orderly manner in the equipment room (1). A control cabinet (2) is arranged on the outside of the side of the SF6 switches (5). A cooling and anti-condensation device (4) is installed on the upper side of the control cabinet (2). An external temperature and humidity sensor (24) is installed at the bottom of the cooling and anti-condensation device (4). The external temperature and humidity sensor (24) monitors and provides feedback on the temperature and humidity of the equipment room (1) outside the control cabinet (2). An internal temperature and humidity sensor is installed on the upper inside of the control cabinet (2). Sensor (23), with a lower temperature and humidity sensor (21) installed inside; the control cabinet (2) is arranged along the length of the inner wall of one side of the equipment room (1), and the indoor environment control device (3) is located on the inner wall of the equipment room (1) on both sides of the control cabinet (2), or the indoor environment control device (3) is located on the inner wall of the equipment room (1) opposite to the control cabinet (2); each control cabinet (2) facing the SF6 switch (5) is equipped with an internal cooling and anti-condensation device (4). The structure of the cabinet cooling and anti-condensation device (4) is as follows: it includes an outer shell (40), one side of the outer shell (40) is set as an air inlet (47) communicating with the equipment room (1), an air filter (471) is installed inside the air inlet (47), and an air outlet is opened on the opposite side of the outer shell (40); it also includes a vertically arranged return air duct (46), the return air duct (46) is arranged in the middle of the inner side of the outer shell (40), on one side, or symmetrically arranged on the two inner sides of the outer shell (40), the top of the return air duct (46) is connected to the return air port (45), the return air port (45) is connected to the inside of the control cabinet (2), a return air fan (461) is installed in the return air duct (46), and the bottom end of the return air duct (46) is connected to the bottom air outlet (41).

2. The environmental control device for an electrical equipment room as described in claim 1, characterized in that: An SF6 gas vent (13) and an external SF6 exhaust fan vent are provided on the lower part of the side wall of the equipment room (1) located opposite to the control cabinet (2). An external SF6 exhaust fan (11) is installed at the external SF6 exhaust fan vent. An upper exhaust vent is provided on the upper part of the same side wall of the equipment room (1) above the external SF6 exhaust fan (11). An upper exhaust fan (12) is installed at the upper exhaust vent.

3. The environmental control device for an electrical equipment room as described in claim 1, characterized in that: The cables (83) that are electrically connected to the equipment in the equipment room (1) are laid in an orderly manner in the cable room (8); a fireproof smoke damper (6) is installed below the bottom air inlet valve (35) of the indoor environment control device (3), and an exhaust pipe (7) is connected below the fireproof smoke damper (6); the outdoor air inlet (81) of the cable is located on the side wall of the cable room (8) away from the exhaust pipe (7), and an air filter device (82) is installed inside the outdoor air inlet (81).

4. The environmental control device for an electrical equipment room as described in claim 1, characterized in that: The structure of the indoor environment control device (3) is as follows: it includes a housing (30), an external air inlet valve (37) is installed on the upper part of one side of the housing (30), and a main air outlet (33) is opened on the lower part of the housing (30) opposite to the other side; an air filter (370) is installed inside the housing (30) located below the top air inlet valve (38) and inside the external air inlet valve (37), and a main fan (32) is installed inside the housing (30) located below the air filter (370), and the main fan (32) is connected to the main air outlet (33) through a silencer elbow (320).

5. The environmental control device for an electrical equipment room as described in claim 4, characterized in that: An indoor environment controller (31) is installed on the side wall of the housing (30) above the main air outlet (33); a flow guide device is installed at the main air outlet (33).

6. The environmental control device for an electrical equipment room as described in claim 1, characterized in that: The upper part of a single control cabinet (2) is equipped with equipment including PLC and CPU. The upper side of the control cabinet (2) is equipped with a cabinet cooling and anti-condensation device (4) facing the equipment. The cabinet cooling and anti-condensation device (4) has two or more cabinet air outlets at intervals above and below the equipment. Each cabinet air outlet is equipped with a fan.

7. A control method for the electrical equipment room environmental control device according to claim 1, characterized in that: The steps include the following: S1. Turn on the indoor environment control device (3); S2. The indoor environmental control device (3) draws air from the outside of the equipment room (1) and brings it into the equipment room (1); S3. The airflow delivered by the indoor environmental control device (3) flows along the inner bottom surface of the equipment room (1) toward the control cabinet (2). After being bounced off the control cabinet (2), the airflow flows in a fan shape toward the SF6 switch (5) and passes through the gap of the SF6 switch (5). S4. This pushes SF6 gas, which is heavier than air, out of the SF6 gas outlet (13) near the inner bottom surface and the SF6 exhaust fan outlet to the outside. The hot and humid air in the equipment room (1) rises under the action of airflow and then overflows to the outside from the upper exhaust vent. The S5, S2-S4 cycle works.

8. The control method of the electrical equipment room environmental control device as described in claim 7, characterized in that: The steps of controlling the temperature and humidity inside the equipment room (1) by the indoor environment control device (3) include: Temperature control method in equipment room (1): External air enters cable room (8) through cable outdoor air inlet (81), and enters indoor environment control device (3) through air duct (7) and bottom air inlet valve (35) from cable room (8). Under the action of main fan (32), air is sent to equipment room (1) through main air outlet (33). The airflow in equipment room (1) overflows to the outside through SF6 gas exhaust port (13) set at the lower part of the wall of equipment room (1), external SF6 fan port, and upper exhaust port on the upper part of the wall, forming a series ventilation and cooling of cable room (8) and equipment room (1); when the detection temperature of outdoor sensor (36) is lower than the detection temperature of cable layer sensor (34), the bottom air inlet valve (35) of indoor environment control device (3) is closed and the external air inlet valve (37) is opened, and air is sent from the outside to equipment room (1); Humidity control method in equipment room (1): When the humidity in cable room (8) and outdoors is higher than the humidity setting value in equipment room (1), open the one with the lower humidity in the outdoor air inlet valve (37) and bottom air inlet valve (35) in the indoor environment control device (3), and at the same time open the top air inlet valve (38) to supply air to equipment room (1) by parallel intake of outdoor air and indoor circulation to maintain a slight positive pressure in the room; The steps for controlling the temperature and humidity inside the control cabinet (2) through the cooling and anti-condensation device (4) include: When the monitoring value of the temperature and humidity sensor (23) inside the cabinet is higher than the monitoring value of the temperature and humidity sensor (21) below, and the difference exceeds the set value, the return air fan (461) is turned on, and air is sent from the bottom air outlet (41) through the return air duct (46) to the lower part of the control cabinet (2), causing the air inside the control cabinet (2) to be stirred up, thereby making the temperature and humidity inside the control cabinet (2) balanced.

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