Circulating pipe network type automatic cooling suffocation fire extinguishing electrical cabinet and operation method

Abstract

The invention relates to a circulating pipe network type automatic cooling, suffocation and fire extinguishing electrical cabinet which comprises a box body, a fire extinguishing assembly and a door locking assembly. The fire extinguishing assembly comprises two U-shaped pipes, the two U-shaped pipes are arranged on the two sides of the interior of the box body correspondingly, the two U-shaped pipes communicate with each other through a first gaseous nitrogen return pipe, and the U-shaped pipe on the left side of the box body communicates with a gaseous nitrogen preparation room through a first gaseous nitrogen supply pipe; the U-shaped pipe on the right side of the box body is communicated with the next electrical cabinet through a second gaseous nitrogen return pipe, and the two ends of the U-shaped pipe are communicated through a second gaseous nitrogen supply pipe. And a plurality of fusible alloy nozzles are arranged on the U-shaped pipe on the right side of the box body at equal intervals. According to the circulating pipe network type automatic cooling suffocation fire extinguishing electrical cabinet and the operation method provided by the invention, the stable operation of equipment is ensured, the service life of the equipment is prolonged, and meanwhile, the fault risk caused by too high temperature is reduced.

Description

Technical Field

[0001] The invention relates to a circulating pipe network type automatic cooling, suffocating and fire extinguishing electrical cabinet and an operating method. Background Art

[0002] The existing HFC-227ea pipe network gas fire extinguishing and IG541 pipe network fire extinguishing systems are both installed outside the power distribution cabinet, which takes up a lot of space. Due to the limitation of system pressure, the pipe network transmission distance is limited. During the fire extinguishing process, hydrofluoric acid and other byproducts will also be decomposed and produced. These substances are corrosive to equipment and extremely irritating to the human respiratory tract, so timely ventilation is required after the fire is extinguished. The price of HFC-227ea agent and other gas fire extinguishing agents such as IG541 are relatively high, which leads to not only a high initial investment cost of the system, but also a high cost of secondary filling once a spray occurs.

[0003] Compared with the pipe network system, the spraying of the non-pipe network system (cabinet type) may not be uniform enough, which may affect the fire extinguishing effect. In addition, the system needs to have a supporting linkage detection alarm device. The smoke and temperature detection devices must be unobstructed to ensure that the detectors can accurately capture smoke or temperature changes. Decorations, furniture or other obstacles should be avoided to interfere with the normal operation of the sensor. The regulations require that the sensor be installed above the room or under the ceiling to meet the efficiency and accuracy of fire detection. This also means that the fire in the distribution room will only be detected when it reaches a certain scale. In the end, the property loss may be more serious due to the failure of automatic fire extinguishing in time.

[0004] Transformers, switch cabinets and other equipment in the power distribution room will generate heat during operation. If the heat dissipation of the equipment is large, air conditioning is required to ensure normal operation of the equipment and extend the life of the equipment. This also leads to an increase in investment costs. At the same time, the air conditioning coil is connected to the water pipe, and once a water leak occurs, it also increases certain safety hazards to the power distribution room.

[0005] Therefore, in view of the above problems, a circulating pipe network type automatic cooling asphyxiation fire extinguishing electrical cabinet and an operating method are proposed. Summary of the invention

[0006] The purpose of the present invention is to overcome the existing defects and provide a circulating pipe network type automatic cooling and suffocation fire extinguishing electrical cabinet and operation method, which helps to ensure the stable operation of the equipment, extend the service life of the equipment, and reduce the risk of failure caused by excessive temperature.

[0007] The technical solution to achieve the above purpose is: a circulating pipe network type automatic cooling and suffocation fire extinguishing electrical cabinet, including a cabinet, a fire extinguishing component and a door locking component;

[0008] The fire extinguishing assembly includes two U-shaped tubes, which are respectively arranged on both sides of the inside of the box, and the two U-shaped tubes are connected through a first gaseous nitrogen return pipe. The U-shaped tube on the left side of the box is connected to the gaseous nitrogen preparation room through the first gaseous nitrogen supply pipe; the U-shaped tube on the right side of the box is connected to the next electrical cabinet through the second gaseous nitrogen return pipe, and the two ends of the U-shaped tube are connected through the second gaseous nitrogen supply pipe; a plurality of fusible alloy nozzles are equidistantly arranged on the U-shaped tube on the right side of the box.

[0009] Preferably, an electric valve is respectively connected to both ends of the U-shaped tube on the right side of the box and the second gaseous nitrogen supply pipe; a high-sensitivity temperature sensor is connected to the top plate of the box, and the three electric valves and the high-sensitivity temperature sensor are electrically connected to a PLC control unit; the PLC control unit is electrically connected to the gaseous nitrogen preparation room and the fire control room, respectively.

[0010] Preferably, the first gaseous nitrogen supply pipe is sequentially provided with a ball valve, a pressure gauge, a safety valve, an eccentric reducer, a pressure reducing valve and a check valve.

[0011] Preferably, outer walls of the first gaseous nitrogen supply pipe, the first gaseous nitrogen return pipe, the U-shaped pipe, the second gaseous nitrogen supply pipe, and the second gaseous nitrogen return pipe are all wrapped with thermal insulation cotton.

[0012] Preferably, a condensation drainage pipe is disposed below each of the two U-shaped tubes, and a drainage funnel is disposed below the condensation drainage pipe.

[0013] Preferably, the box body is connected to the cabinet door via a door hinge, an internal data frame is arranged inside the cabinet door; an electronic lock and a manual door lock are arranged at the edge of the cabinet door; and an electric push rod is connected to the electronic lock.

[0014] Preferably, a busbar room, a functional unit room, a secondary unit circuit and a cable room are respectively arranged inside the box.

[0015] Preferably, the cabinet door is respectively provided with a first power indicator light, a second power indicator light, a third power indicator light, a meter, a fault indicator light, a running indicator light, a stop indicator light, a start button, a stop button and a load indicator light.

[0016] Preferably, the upper end of the box body is connected to a top plate, and four lifting rings are connected to the top plate.

[0017] Preferably, the lower end of the box body is connected to a bottom plate, and a cable inlet hole is opened on the bottom plate; the lower end of the bottom plate is connected to a C-shaped channel steel.

[0018] The operation method of the circulating pipe network type automatic cooling and suffocation fire extinguishing electrical cabinet includes:

[0019] Step S1, operate when the temperature in the power distribution cabinet is lower than the set temperature;

[0020] Step S2, operating when the temperature in the power distribution cabinet is higher than the set temperature;

[0021] Step S3, operation when the temperature in the power distribution cabinet is extremely high.

[0022] In step S1, when the temperature in the power distribution cabinet is lower than the set temperature, the operation includes:

[0023] Step S11, the temperature of the gaseous nitrogen in the pipeline network is controlled between -20℃ and -10℃, and the cold transfer temperature of the gaseous nitrogen is controlled by the insulation thickness; the PLC control unit sets the temperature in the distribution cabinet to always be the same as or lower than the room temperature in the distribution room with seasonal changes. When the high-sensitivity temperature sensor detects that the temperature in the distribution cabinet is lower than the set temperature lower limit, it transmits a signal to the PLC control unit. At this time, the PLC control unit sends a signal to the electric push rod in the distribution cabinet, causing it to automatically open the distribution cabinet door, so as to quickly achieve the temperature equalization between the distribution cabinet and the distribution room.

[0024] In step S2, when the temperature in the power distribution cabinet is higher than the set temperature, the operation includes:

[0025] In step S21, when the high-sensitivity temperature sensor detects that the temperature inside the distribution cabinet is higher than the set temperature upper limit, it transmits a signal to the PLC control unit, causing it to automatically close the distribution cabinet door to reduce the temperature inside the distribution cabinet to the set constant temperature range.

[0026] The step S3, operation when the temperature in the power distribution cabinet is too high, includes:

[0027] Step S31, when the high-sensitivity temperature sensor detects that the temperature inside the power distribution cabinet is higher than 68°C, the signal is transmitted to the PLC control unit. The PLC control unit sends a signal to the electric push rod to force the power distribution cabinet door to be closed, and personnel cannot open it at this time;

[0028] Step S32, when the temperature is higher than 78°C, the fusible alloy nozzle on the U-tube will automatically rupture, and gaseous nitrogen will be sprayed out for 30 seconds, which will quickly lower the temperature to absorb the surrounding heat and eliminate oxygen to achieve the effect of extinguishing the flame; when the gaseous nitrogen fire extinguishing system is started, the PLC control unit has transmitted the fire extinguishing command to the fire control room.

[0029] Preferably, after the fire is extinguished, the bypass pipe electric valve above the accident distribution cabinet is automatically opened under the control of the PLC control unit, and the two electric valves in the distribution cabinet are automatically closed to ensure the normal use of the temperature control and automatic fire extinguishing functions in other distribution cabinets.

[0030] The beneficial effects of the present invention are as follows: the circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet and operation method are to successfully replace the cooling and automatic fire extinguishing functions of the distribution cabinet that can only be achieved by combining the air conditioning system and the automatic gas fire extinguishing system through a set of gaseous nitrogen circulating pipe network system. Fire monitoring can be performed on each distribution cabinet separately, and the open fire in a single distribution cabinet can be quickly extinguished at the early stage of the fire, and no suffocation hazard will be caused in the distribution room; and in the absence of a fire, the cabinet door can be automatically opened and closed as the temperature in the distribution cabinet increases or decreases, so that the temperature in each distribution cabinet is always in a constant temperature state, which helps to ensure the stable operation of the equipment, extend the service life of the equipment, and reduce the risk of failure caused by excessive temperature. Through a set of systems, it is possible to save the cost of project investment while cooling and extinguishing a single distribution cabinet separately. Both the cooling effect and the fire extinguishing effect are better than the effect of two sets of systems with conventional configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a connection diagram of the circulating pipe network type automatic cooling, suffocation and fire extinguishing electrical cabinet of the present invention;

[0032] Figure 2 It is a left side view of the box body of the present invention;

[0033] Figure 3 It is a right side view of the box body of the present invention;

[0034] Figure 4 It is a front view of the box body of the present invention;

[0035] Figure 5 It is a top view of the box body of the present invention;

[0036] Figure 6 It is a bottom view of the box body of the present invention;

[0037] Figure 7 is a schematic diagram of the operating method of the present invention;

[0038] Figure 8 is a detailed schematic diagram of step S1 of the operating method of the present invention;

[0039] Fig. 9 is a detailed schematic diagram of step S2 of the operating method of the present invention;

[0040] Fig.10 It is a detailed schematic diagram of step S3 of the operating method of the present invention.

[0041] In the figure: 1. Top plate; 2. Lifting ring; 3. First power indicator light; 4. Second power indicator light; 5. Third power indicator light; 6. Meter; 7. Fault indicator light; 8. Operation indicator light; 9. Stop indicator light; 10. Start button; 11. Stop button; 12. Load indicator light; 13. Electronic lock; 14. Manual door lock; 15. Box; 16. C-shaped channel steel; 17. Cable entry hole; 18. Bottom plate; 19. Ball valve; 20. Pressure gauge; 21. Safety valve; 22. Pressure reducing valve; 23. Check valve; 24. Insulation cotton; 26. High-sensitivity temperature sensor Sensor; 28. Fusible alloy nozzle; 29. ​​Drain funnel; 30. Internal data frame; 31. Door hinge; 32. First gaseous nitrogen supply pipe; 33. First gaseous nitrogen return pipe; 34. Electric valve; 35. U-shaped pipe; 36. Condensation guide pipe; 37. Second gaseous nitrogen supply pipe; 38. Second gaseous nitrogen return pipe; 39. Eccentric reducer; 40. Electric push rod; 41. Busbar room; 42. Functional unit room; 43. Secondary unit circuit; 44. Cable room; 45. Gaseous nitrogen preparation room; 46. PLC control unit; 47. Fire control room; 48. Cabinet door. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] like Figure 1-6 As shown, a circulating pipe network type automatic cooling and suffocation fire extinguishing electrical cabinet includes a box body 15, a fire extinguishing assembly and a door locking assembly; the fire extinguishing assembly includes two U-shaped tubes 35, the two U-shaped tubes 35 are respectively arranged on both sides of the inside of the box body 15, and the two U-shaped tubes 35 are connected through a first gaseous nitrogen return pipe 33. The U-shaped tube 35 on the left side of the box body 15 is connected to a gaseous nitrogen preparation room 45 through a first gaseous nitrogen supply pipe 32; the U-shaped tube 35 on the right side of the box body 15 is connected to the next electrical cabinet through a second gaseous nitrogen return pipe 38, and both ends of the U-shaped tube 35 are connected through a second gaseous nitrogen supply pipe 37; a plurality of fusible alloy nozzles 28 are equidistantly arranged on the U-shaped tube 35 on the right side of the box body 15.

[0045] like Figure 1As shown, an electric valve 34 is connected to each of the two ends of the U-shaped tube 35 on the right side of the box 15 and the second gaseous nitrogen supply pipe 37; a high-sensitivity temperature sensor 26 is connected to the top plate of the box 15, and the three electric valves 34 and the high-sensitivity temperature sensor 26 are electrically connected to the PLC control unit 46; the PLC control unit 46 is electrically connected to the gaseous nitrogen preparation room 45 and the fire control room 47. The first gaseous nitrogen supply pipe 32 is provided with a ball valve 19, a pressure gauge 20, a safety valve 21, an eccentric reducer 39, a pressure reducing valve 22 and a check valve 23 in sequence. The outer walls of the first gaseous nitrogen supply pipe 32, the first gaseous nitrogen return pipe 33, the U-shaped tube 35, the second gaseous nitrogen supply pipe 37, and the second gaseous nitrogen return pipe 38 are all wrapped with thermal insulation cotton 24. A condensation drain pipe 36 is provided below each of the two U-shaped tubes 35, and a drainage funnel 29 is provided below the condensation drain pipe 36.

[0046] Specifically, the temperature of the gaseous nitrogen in the pipe network is controlled between -20°C and -10°C, and the cold transfer temperature of the gaseous nitrogen is controlled by the thickness of the insulation. The PLC control unit 46 can set the temperature in the distribution cabinet to always be equal to or lower than the room temperature in the distribution room as the seasons change. When the high-sensitivity temperature sensor 26 detects that the temperature in the distribution cabinet is lower than the set temperature lower limit, it transmits a signal to the PLC control unit 46. At this time, the PLC control unit 46 sends a signal to the electric push rod 40 in the distribution cabinet, so that it automatically opens the distribution cabinet door 48 to achieve the rapid equalization of the temperature in the distribution cabinet and the distribution room. Conversely, when the high-sensitivity temperature sensor 26 detects that the temperature in the distribution cabinet is higher than the set temperature upper limit, it transmits a signal to the PLC control unit 46 to automatically close the distribution cabinet door to reduce the temperature in the distribution cabinet to the set constant temperature range. The upper and lower limit temperatures of the constant temperature interval value cannot exceed 8°C to prevent condensation and tripping in the electrical components, busbars, wiring terminals, etc. in the distribution cabinet due to excessive temperature difference.

[0047] Specifically, when the high-sensitivity temperature sensor 26 detects that the temperature in the distribution cabinet is higher than 68°C, the signal is transmitted to the PLC control unit 46. The PLC control unit sends a signal to the electric push rod 40 to force the cabinet door 48 to close. At this time, personnel cannot open it. When the temperature is higher than 78°C, the fusible alloy nozzle 28 on the U-tube 35 will automatically rupture, and gaseous nitrogen will be sprayed out for 30 seconds, which will quickly lower the temperature to absorb the surrounding heat and remove oxygen to achieve the effect of extinguishing the flame. When the gaseous nitrogen fire extinguishing system is started, the PLC control unit 46 has transmitted the fire extinguishing command to the fire control room 47.

[0048] Specifically, after the fire is extinguished, the bypass pipe electric valve 34 above the accident distribution cabinet is automatically opened under the control of the PLC control unit, and the two electric valves in the distribution cabinet are automatically closed to ensure the normal use of the temperature control and automatic fire extinguishing functions in other distribution cabinets.

[0049] like Figure 1As shown, the box 15 is connected to the cabinet door 48 through the door hinge 31, and the internal data frame 30 is set in the cabinet door 48; the electronic lock 13 and the manual door lock 14 are set at the edge of the cabinet door 48; the electric push rod 40 is connected to the electronic lock 13. The signal of the electric push rod 40 is connected to the PLC control unit, and the electronic lock is linked by the electric push rod to realize the automatic opening and closing of the power distribution cabinet door.

[0050] like Figure 1 As shown, the box 15 is provided with a busbar chamber 41, a functional unit chamber 42, a secondary unit circuit 43 and a cable chamber 44. The cabinet door 48 is provided with a first power indicator light 3, a second power indicator light 4, a third power indicator light 5, a meter 6, a fault indicator light 7, a running indicator light 8, a stop indicator light 9, a start button 10, a stop button 11 and a load indicator light 12.

[0051] like Figure 5 As shown, the upper end of the box body 15 is connected to the top plate 1, and four lifting rings 2 are connected to the top plate 1. Four M12 lifting rings 2 are welded on the top plate 1 for lifting the power distribution cabinet in place.

[0052] like Figure 6 As shown, the lower end of the box 15 is connected to a bottom plate 18, and a cable entry hole 17 is opened on the bottom plate 18; the lower end of the bottom plate 18 is connected to the C-shaped channel steel 16. The bottom of the bottom plate 18 is connected to the C-shaped channel steel by threads to provide a stable support foundation. The cable entry hole 17 is a square hole of 200mm*200mm, which serves as a cable entry hole.

[0053] This circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet is to successfully replace the cooling and automatic fire extinguishing functions of the distribution cabinet that can only be achieved by combining the air conditioning system and the automatic gas fire extinguishing system through a set of gaseous nitrogen circulating pipe network system. Fire monitoring can be carried out on each distribution cabinet separately, and the open fire in a single distribution cabinet can be quickly extinguished at the early stage of the fire, and no suffocation hazards will be caused in the distribution room; and in the absence of a fire, the cabinet door can be automatically opened and closed as the temperature in the distribution cabinet increases or decreases, so that the temperature in each distribution cabinet is always in a constant temperature state, which helps to ensure the stable operation of the equipment, extend the service life of the equipment, and reduce the risk of failure caused by excessive temperature. Through a set of systems, it is possible to save engineering investment costs while cooling and extinguishing a single distribution cabinet separately. Both the cooling effect and the fire extinguishing effect are better than the two sets of systems with conventional configurations.

[0054] like Figure 7-10 As shown, the operation method of the circulating pipe network type automatic cooling and suffocation fire extinguishing electrical cabinet includes:

[0055] Step S1, operate when the temperature in the power distribution cabinet is lower than the set temperature;

[0056] In step S1, when the temperature in the power distribution cabinet is lower than the set temperature, the operation includes:

[0057] In step S11, the temperature of the gaseous nitrogen in the pipeline network is controlled between -20°C and -10°C, and the cold transfer temperature of the gaseous nitrogen is controlled by the insulation thickness; the PLC control unit 46 sets the temperature in the distribution cabinet to always be the same as or lower than the room temperature in the distribution room as the seasons change. When the high-sensitivity temperature sensor 26 detects that the temperature in the distribution cabinet is lower than the set temperature lower limit, it transmits a signal to the PLC control unit 46. At this time, the PLC control unit 46 sends a signal to the electric push rod 40 in the distribution cabinet, causing it to automatically open the distribution cabinet door 48, so as to quickly achieve the temperature equalization between the distribution cabinet and the distribution room.

[0058] Step S2, operating when the temperature in the power distribution cabinet is higher than the set temperature;

[0059] In step S21, when the high-sensitivity temperature sensor 26 detects that the temperature inside the distribution cabinet is higher than the set temperature upper limit, it transmits a signal to the PLC control unit 46, causing it to automatically close the distribution cabinet door to reduce the temperature inside the distribution cabinet to the set constant temperature range.

[0060] Step S3, operation when the temperature in the power distribution cabinet is extremely high.

[0061] The step S3, operation when the temperature in the power distribution cabinet is too high, includes:

[0062] Step S31, when the high-sensitivity temperature sensor 26 detects that the temperature inside the power distribution cabinet is higher than 68°C, the signal is transmitted to the PLC control unit 46. The PLC control unit sends a signal to the electric push rod 40 to force the power distribution cabinet door 48 to close. At this time, personnel cannot open it;

[0063] Step S32, when the temperature is higher than 78°C, the fusible alloy nozzle 28 on the U-tube 35 will automatically rupture, and gaseous nitrogen will be sprayed out for 30 seconds, which will quickly lower the temperature to absorb the surrounding heat and remove oxygen to achieve the effect of extinguishing the flame; when the gaseous nitrogen fire extinguishing system is started, the PLC control unit 46 has transmitted the fire extinguishing command to the fire control room 47.

[0064] After the fire is extinguished, the bypass pipe electric valve 34 above the accident distribution cabinet is automatically opened under the control of the PLC control unit, and the two electric valves in the distribution cabinet are automatically closed to ensure the normal use of the temperature control and automatic fire extinguishing functions in other distribution cabinets.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Circulating pipe network type automatic cooling and suffocation fire extinguishing electrical cabinet, characterized in that: It comprises a box body (15), a fire extinguishing assembly and a door locking assembly; The fire extinguishing assembly comprises two U-shaped tubes (35), the two U-shaped tubes (35) are respectively arranged on both sides of the interior of the box (15), the two U-shaped tubes (35) are connected through a first gaseous nitrogen return pipe (33), the U-shaped tube (35) on the left side of the box (15) is connected to a gaseous nitrogen preparation room (45) through a first gaseous nitrogen supply pipe (32); the U-shaped tube (35) on the right side of the box (15) is connected to the next electrical cabinet through a second gaseous nitrogen return pipe (38), and the two ends of the U-shaped tube (35) are connected through a second gaseous nitrogen supply pipe (37); a plurality of fusible alloy nozzles (28) are arranged at equal distances on the U-shaped tube (35) on the right side of the box (15).

2. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 1 is characterized in that: An electric valve (34) is respectively connected to the two ends of the U-shaped tube (35) on the right side of the box (15) and the second gaseous nitrogen supply pipe (37); a high-sensitivity temperature sensor (26) is connected to the top plate of the box (15); the three electric valves (34) and the high-sensitivity temperature sensor (26) are electrically connected to a PLC control unit (46); and the PLC control unit (46) is electrically connected to the gaseous nitrogen preparation room (45) and the fire control room (47).

3. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 1 is characterized in that: The first gaseous nitrogen supply pipe (32) is provided with a ball valve (19), a pressure gauge (20), a safety valve (21), an eccentric reducer (39), a pressure reducing valve (22) and a check valve (23) in sequence.

4. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 1 is characterized in that: The outer walls of the first gaseous nitrogen supply pipe (32), the first gaseous nitrogen return pipe (33), the U-shaped pipe (35), the second gaseous nitrogen supply pipe (37), and the second gaseous nitrogen return pipe (38) are all wrapped with thermal insulation cotton (24).

5. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 1 is characterized in that: A condensation drainage pipe (36) is disposed below each of the two U-shaped tubes (35), and a drainage funnel (29) is disposed below the condensation drainage pipe (36).

6. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 1 is characterized in that: The box body (15) is connected to a cabinet door (48) via a door hinge (31), and an internal data frame (30) is arranged inside the cabinet door (48); an electronic lock (13) and a manual door lock (14) are arranged at the edge of the cabinet door (48); and an electric push rod (40) is connected to the electronic lock (13).

7. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 1 is characterized in that: The box body (15) is provided with a busbar chamber (41), a functional unit chamber (42), a secondary unit circuit (43) and a cable chamber (44) respectively.

8. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 6 is characterized in that: The cabinet door (48) is respectively provided with a first power indicator light (3), a second power indicator light (4), a third power indicator light (5), a meter (6), a fault indicator light (7), an operation indicator light (8), a stop indicator light (9), a start button (10), a stop button (11) and a load indicator light (12).

9. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 1 is characterized in that: The upper end of the box body (15) is connected to a top plate (1), and four lifting rings (2) are connected to the top plate (1).

10. The circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 1 is characterized in that: The lower end of the box body (15) is connected to a bottom plate (18), and a cable inlet hole (17) is provided on the bottom plate (18); the lower end of the bottom plate (18) is connected to a C-shaped channel steel (16).

11. The operation method of the circulating pipe network type automatic cooling and suffocation fire extinguishing electrical cabinet is characterized in that: include: Step S1, operate when the temperature in the power distribution cabinet is lower than the set temperature; Step S2, operating when the temperature in the power distribution cabinet is higher than the set temperature; Step S3, operation when the temperature in the power distribution cabinet is extremely high.

12. The method for operating the circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 11, characterized in that: In step S1, when the temperature in the power distribution cabinet is lower than the set temperature, the operation includes: Step S11, the temperature of the gaseous nitrogen in the pipe network is controlled between -20°C and -10°C, and the cold transfer temperature of the gaseous nitrogen is controlled by the insulation thickness; the PLC control unit (46) sets the temperature in the distribution cabinet to be always equal to or lower than the room temperature in the distribution room as the seasons change. When the high-sensitivity temperature sensor (26) detects that the temperature in the distribution cabinet is lower than the set lower limit of the temperature, it transmits a signal to the PLC control unit (46). At this time, the PLC control unit (46) sends a signal to the electric push rod (40) in the distribution cabinet, causing it to automatically open the distribution cabinet door (48), so as to quickly achieve the temperature in the distribution cabinet and the distribution room being equal.

13. The operating method of the circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 11 is characterized in that: In step S2, when the temperature in the power distribution cabinet is higher than the set temperature, the operation includes: In step S21, when the high-sensitivity temperature sensor (26) detects that the temperature inside the power distribution cabinet is higher than the set temperature upper limit, it transmits a signal to the PLC control unit (46), causing it to automatically close the power distribution cabinet door to reduce the temperature inside the power distribution cabinet to the set constant temperature range.

14. The method for operating the circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 11, characterized in that: The step S3, operation when the temperature in the power distribution cabinet is too high, includes: Step S31, when the high-sensitivity temperature sensor (26) detects that the temperature inside the power distribution cabinet is higher than 68°C, a signal is transmitted to the PLC control unit (46). The PLC control unit sends a signal to the electric push rod (40) to forcefully close the power distribution cabinet door (48), and personnel cannot open it at this time; Step S32, when the temperature is higher than 78°C, the fusible alloy nozzle (28) on the U-tube (35) will automatically rupture, and gaseous nitrogen will be ejected for 30 seconds, which will quickly lower the temperature, absorb the surrounding heat and remove oxygen to achieve the effect of extinguishing the flame; when the gaseous nitrogen fire extinguishing system is started, the PLC control unit (46) has transmitted the fire extinguishing command to the fire control room (47).

15. The method for operating the circulating pipe network type automatic cooling and suffocating fire extinguishing electrical cabinet according to claim 14, characterized in that: After the fire is extinguished, the bypass pipe electric valve (34) above the accident distribution cabinet is automatically opened under the control of the PLC control unit, and the two electric valves in the distribution cabinet are automatically closed to ensure the normal use of the temperature control and automatic fire extinguishing functions in other distribution cabinets.

Images