Cooling and ventilation system for long-distance ventilation interval of electric power pipe gallery

Abstract

According to the technical scheme, the cooling and ventilation system for the long-distance ventilation interval of the electric power pipe gallery comprises a ventilation unit, and fireproof partitions are arranged at the two ends of the ventilation unit respectively; the top surfaces of two ends of the ventilation unit are respectively provided with an air inlet and an air outlet communicated with the interior; an air inlet pavilion is arranged above the air inlet, an air outlet pavilion is arranged above the air outlet, an air inlet fan is arranged in the air inlet pavilion, an air outlet fan is arranged in the air outlet pavilion, and a plurality of fireproof subareas are arranged in the ventilation unit; every two fireproof subareas are separated by a fireproof door; the air inlet pavilion is further provided with a small fan. An air pipe is connected below the small fan, the air pipe extends from the air inlet to the position below the air outlet along the walls on the two sides of the interior of the ventilation unit, small holes are evenly formed in the air pipe at intervals, and the head end of the air pipe is communicated with the air outlet of the small fan; the tail end of the air pipe is closed. The cooling efficiency of the ventilation system is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe gallery ventilation, and in particular relates to a cooling and ventilation system for a long-distance ventilation interval of an electric power pipe gallery. Background Art

[0002] The power corridor is a municipal project built in the underground space of the city. It is a municipal cable and pipeline that mainly accommodates electricity and is the "lifeline" of modern urban electricity. The high-voltage cables emit a lot of heat when working. At the same time, the corridor is a closed underground space, which leads to a high temperature in the corridor and is prone to safety accidents such as fire. Therefore, a ventilation system needs to be set up in the corridor to control the temperature in the corridor and ensure the safe operation of the power corridor.

[0003] The ventilation interval of the traditional pipe gallery is consistent with the fire compartment setting. Inlet and outlet ports are set at both ends of each fire compartment, and wind pavilions are built on the corresponding ground. However, the construction of wind pavilions is restricted by the actual ground environment. When it is impossible to build wind pavilions, it is necessary to increase the length of the ventilation interval and treat multiple fire compartments as a long-distance ventilation interval. Long-distance ventilation intervals will significantly increase the temperature and resistance along the corridor. It is difficult for traditional pipe gallery ventilation systems to control the temperature in long ventilation intervals.

[0004] There are several fire doors in the long ventilation interval. There is a larger area change between the fire doors and the middle of the fire interval, which makes the air volume more concentrated in the middle of the corridor. At the same time, brackets are arranged in the cable areas on both sides, and the ventilation resistance is large. As a result, the air volume in the cable areas on both sides of the corridor is small. In addition, the heat of the cables accumulates here, resulting in high temperature in the cable area, which is prone to safety accidents. Utility Model Content

[0005] The purpose of the utility model is to solve the deficiencies of the above-mentioned background technology and to provide a cooling and ventilation system for long-distance ventilation intervals in a power corridor to improve the cooling efficiency of the ventilation system.

[0006] The technical solution adopted by the utility model is: a cooling and ventilation system for long-distance ventilation intervals of an electric power corridor, comprising a ventilation unit, wherein fire partitions are respectively arranged at both ends of the ventilation unit; air inlets and air outlets connected to the interior thereof are respectively arranged on the top surfaces at both ends of the ventilation unit; an air inlet pavilion is arranged above the air inlet, an exhaust pavilion is arranged above the air outlet, an air inlet fan is arranged in the air inlet pavilion, an exhaust fan is arranged in the exhaust pavilion, a plurality of fire partitions are arranged inside the ventilation unit; every two fire partitions are separated by a fire door; a small fan is also arranged in the air inlet pavilion; an air duct is connected below the small fan, the air duct extends from the air inlet to below the air outlet along the inner walls on both sides of the ventilation unit, small holes are evenly arranged on the air duct, the head end of the air duct is connected to the air outlet of the small fan; the end of the air duct is closed.

[0007] In the above technical solution, the air duct is arranged in the middle of the two layers of cable brackets inside the ventilation unit; and the air outlet faces the middle of the ventilation unit.

[0008] The above technical solution also includes a connecting pipe; the connecting pipe extends vertically downward from the air outlet of the small fan, and its head end is connected to the air outlet of the small fan; the air duct includes multiple ones and is evenly distributed from top to bottom on the inner walls of the ventilation unit on both sides; the head end of the air duct is connected to the connecting pipe; the end of the connecting pipe is connected to the head end of the air duct on the bottom layer.

[0009] In the above technical solution, the air duct is formed by a plurality of sub-tubes connected coaxially front and back through joints.

[0010] In the above technical solution, an axial flow fan is provided in each fire compartment; the axial flow fan is arranged on the inner top surface of the ventilation unit; the air inlet and exhaust wind direction of the axial flow fan is consistent with the air inlet and exhaust direction of the ventilation unit.

[0011] In the above technical solution, the axial flow fan is arranged 2m away from the fire door.

[0012] In the above technical solution, the wind pressure provided by the axial flow fan is greater than the local resistance of the fire door.

[0013] In the above technical solution, the air intake fan and the exhaust fan are both integrated with an atmospheric temperature sensor; the air intake fan and the exhaust fan change the wind speed according to the temperature monitored by the corresponding atmospheric temperature sensor.

[0014] In the above technical solution, rainproof shutters are provided at the places where the air inlet pavilion and the air exhaust pavilion are connected to the outside.

[0015] In the above technical solution, stainless steel wire meshes are arranged above the air inlet fan, the exhaust fan and the small fan.

[0016] The beneficial effects of the utility model are as follows: the utility model is suitable for long-distance ventilation units built due to objective conditions. By setting air ducts in the cable area of ​​the ventilation unit, the high local resistance caused by the cable bracket and the fire door is avoided, making the cross-sectional air volume more uniform. At the same time, the utility model sets an axial flow fan in the ventilation unit to assist the intake and exhaust fans in overcoming the high resistance along the long ventilation interval. Compared with the traditional single intake and exhaust fan ventilation system, the utility model is more suitable for long ventilation intervals and can more effectively discharge the heat accumulated in the cable area due to the long ventilation interval.

[0017] At the same time, the utility model is equipped with a variable frequency fan and an atmospheric temperature monitoring sensor, which can adjust the air volume according to the outside temperature. The cooling effect of the ventilation system is related to the inlet air temperature and air volume. When the power corridor is in long-term operation, the outside atmospheric temperature will change greatly with the day and night and the season. According to the atmospheric temperature monitored by the sensor, the variable frequency fan adjusts the air volume in real time, ensuring the effectiveness of the system for long-term use and achieving energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the utility model.

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the pipe gallery in the utility model.

[0020] Figure 3 It is a schematic diagram of the air intake pavilion in the utility model.

[0021] Among them, 1-ventilation unit, 2-axial flow fan, 3-fire door, 4-air duct, 5-connector, 6-air inlet booth, 7-exhaust booth, 8-inlet fan, 9-small fan, 10-exhaust fan, 11-atmospheric temperature sensor, 12-cable bracket, 13-clamp, 14-stainless steel wire mesh, 15-full-automatic fire damper, 16-closed pipe, 17-turn joint, 18-horizontal pipe, 19-connecting pipe, 20-rainproof shutters. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0023] like Figure 1 As shown, the utility model provides a cooling and ventilation system for long-distance ventilation intervals of an electric power corridor, comprising a ventilation unit 1, wherein fire partitions are respectively arranged at both ends of the ventilation unit 1; air inlets and air outlets connected to the interior thereof are respectively arranged on the top surfaces at both ends of the ventilation unit 1; an air inlet pavilion 6 is arranged above the air inlet, an exhaust pavilion 7 is arranged above the air outlet, an air inlet fan 8 is arranged in the air inlet pavilion 6, an exhaust fan 10 is arranged in the exhaust pavilion 7, and a plurality of fire partitions are arranged inside the ventilation unit 1; each two fire partitions are separated by a fire door 3; a small fan 9 is also arranged in the air inlet pavilion 6; an air duct 4 is connected below the small fan 9, the air duct 4 extends from the air inlet to below the air outlet along the inner walls on both sides of the ventilation unit 1, small holes are evenly arranged on the air duct 4, the head end of the air duct 4 is connected to the air outlet of the small fan 9; the end of the air duct 4 is closed.

[0024] like Figure 1 and Figure 3As shown, multiple ventilation units 1 are arranged side by side. The fire partitions of two ventilation units 1 fit closely. The air inlets of two adjacent ventilation units 1 are arranged correspondingly, and the air outlets of two adjacent ventilation units 1 are arranged correspondingly, so as to avoid the problem that the air inlet and the air outlet are arranged at the same place, resulting in poor heat dissipation. Air inlets and air outlets are provided at both ends of the top surface of the ventilation unit 1. The edges of the air inlet and the air outlet extend upward to form corresponding air inlet pavilions 6 and air outlet pavilions 7. The air inlet fan 8 is arranged at the lower part of the air inlet pavilion 6, and one side of the upper part of the air inlet pavilion 6 is connected to the outside. The exhaust fan 10 is arranged at the lower part of the exhaust pavilion 7, and one side of the upper part of the exhaust pavilion 7 is connected to the outside. The air inlet pavilion 6 and the exhaust pavilion 7 are both provided with rainproof shutters 20 at the connection points with the outside. After the external air enters the air inlet pavilion 6 through the action of the air inlet fan 8, it enters the ventilation unit 1 through the air inlet, and then is discharged from the exhaust pavilion 7 through the exhaust outlet. The rainproof shutters 20 can prevent the sundries such as leaves from outside from entering the fan and affecting its normal operation. The shapes of the air inlet pavilion 6 and the air outlet pavilion 7 are basically consistent, and the rainproof shutters 20 of the two are arranged oppositely.

[0025] External air is also introduced into the air duct 4 through the air inlet booth 6 by the action of the small fan 9, and enters the ventilation area, that is, the inside of the power pipeline corridor, through the air outlet holes on the air duct 4.

[0026] Specifically, the air duct 4 is arranged in the middle of the two-layer cable bracket 12 inside the ventilation unit 1; the air outlet is toward the middle of the ventilation unit 1. The air duct 4 is connected to the side wall of the pipe gallery by installing a clamp 13, and the connection method is bolt connection. The air duct 4 is a PE hard polyvinyl chloride circular air duct 4, which has a diameter of 160mm, a wall thickness of 3mm, and a length of 6m. It is suitable for low and medium pressure conditions of pipe gallery ventilation, and the PE material has good flame retardancy and can work with cables for a long time. The air discharged from the air duct 4 through the air outlet effectively dissipates heat for the cable.

[0027] Specifically, it also includes a connecting pipe 19; the connecting pipe 19 extends vertically downward from the air outlet of the small fan 9, and its head end is connected to the air outlet of the small fan 9; the air duct 4 includes multiple ones and is evenly distributed from top to bottom on the inner walls of the ventilation unit 1 on both sides; the head end of the air duct 4 is connected to the connecting pipe 19; the end of the connecting pipe 19 is connected to the head end of the air duct 4 on the bottom layer.

[0028] like Figure 2 As shown, a closed pipe 16 is connected below the small fan 9 so that the air flows to the left and right transverse pipes 18. The left and right transverse pipes 18 extend to the left and right walls respectively, and their ends are connected to the connecting pipe 19 through a 90° turn joint 17, which is connected to the air duct 4 through a three-way pipe joint 5 in the middle of the two layers of cables.

[0029] Preferably, the air duct 4 is formed by a plurality of sub-ducts connected coaxially front and back through a joint 5. The length of the air duct 4 can be adjusted according to the pipe gallery used, and the air duct 4 extends longitudinally to the air outlet through the joint 5.

[0030] Preferably, an axial flow fan 2 is provided in each fire partition; the axial flow fan 2 is provided on the inner top surface of the ventilation unit 1; the air inlet and outlet wind direction of the axial flow fan 2 is consistent with the air inlet and outlet direction of the ventilation unit 1, further enhancing the ventilation and heat dissipation in the pipe gallery. The axial flow fan 2 is provided at the middle top of the ventilation interval, arranged longitudinally along the ventilation direction, and connected to the top of the pipe gallery by installing a clamp 13, and the connection method is bolt connection.

[0031] Preferably, the axial flow fan 2 is arranged 2m away from the fire door to ensure a reasonable layout in the pipe gallery and to ensure sufficient heat dissipation while meeting fire protection requirements. The wind pressure provided by the axial flow fan 2 is greater than the local resistance of the fire door 3 to ensure that the axial flow fan strengthens the air circulation in the long-distance ventilation interval of the pipe gallery. The local resistance of the fire door refers to the energy loss caused by the sudden reduction of the air flow area at the fire door compared to the inside of the fire compartment, which is different from the resistance along the fire compartment.

[0032] Specifically, the air intake fan 8 and the exhaust fan 10 are both integrated with an atmospheric temperature sensor 11; the air intake fan 8 and the exhaust fan 10 are both variable frequency fans, and the control chip inside the air intake fan 8 and the exhaust fan 10 can change the wind speed according to the temperature monitored by the corresponding atmospheric temperature sensor 11 to ensure the cooling effect and energy saving of the ventilation system. The air volume of the exhaust fan 10 is the sum of the air volume of the air intake fan 8 and the air volume of the small fan 9, and the air volume of the air intake fan 8 and the exhaust fan 10 is adjusted at the same time during the variable frequency adjustment to ensure that the above air volume relationship is applicable in real time.

[0033] like Figure 3 As shown, preferably, a stainless steel wire mesh 14 is provided above the air inlet fan 8, the exhaust fan 10 and the small fan 9, and the stainless steel wire mesh 14 of the three is provided in the same manner. A 70°C fully automatic fire damper 15 is provided below the exhaust fan 10 and the small fan 9, and the fully automatic fire damper 15 of the two is provided in the same manner. The stainless steel wire mesh 14 can further prevent debris from entering the fan, and the 70°C fully automatic fire damper 15 can cut off the power supply to the air inlet fan 8, the exhaust fan 10 and the small fan 9 in the event of a fire, thereby ensuring the safety of the pipe gallery.

[0034] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A cooling and ventilation system for a long-distance ventilation interval of an electric power corridor, comprising a ventilation unit, wherein both ends of the ventilation unit are respectively provided with fire partitions; both ends of the ventilation unit are respectively provided with air inlets and air outlets connected to the interior thereof; an air inlet pavilion is provided above the air inlet, an air outlet pavilion is provided above the air outlet, an air inlet fan is provided in the air inlet pavilion, an exhaust fan is provided in the exhaust pavilion, and a plurality of fire partitions are provided inside the ventilation unit; each two fire partitions are separated by a fire door; the characteristics are as follows: A small fan is also provided in the air inlet booth; an air duct is connected below the small fan, and the air duct extends from the air inlet to below the air outlet along the inner walls of the ventilation unit on both sides, and air outlet holes are evenly spaced on the air duct, and the head end of the air duct is connected to the air outlet of the small fan; the end of the air duct is closed.

2. According to claim 1, a cooling and ventilation system for long-distance ventilation intervals in a power pipeline corridor is characterized by: The air duct is arranged in the middle of the two layers of cable brackets inside the ventilation unit; and the air outlet faces the middle of the ventilation unit.

3. According to claim 2, a cooling and ventilation system for long-distance ventilation intervals in a power pipeline corridor is characterized in that: It also includes a connecting pipe; the connecting pipe extends vertically downward from the air outlet of the small fan, and its head end is connected to the air outlet of the small fan; the air duct includes multiple ones and is evenly distributed from top to bottom on the inner walls of the ventilation unit on both sides; the head end of the air duct is connected to the connecting pipe; the end of the connecting pipe is connected to the head end of the air duct on the bottom layer.

4. A cooling and ventilation system for long-distance ventilation intervals in a power corridor according to claim 3, characterized in that: The air duct is formed by a plurality of sub-tubes being coaxially connected front and back through joints.

5. According to claim 1, a cooling and ventilation system for long-distance ventilation intervals in a power pipeline corridor is characterized by: An axial flow fan is provided in each fire compartment; the axial flow fan is arranged on the inner top surface of the ventilation unit; the air inlet and exhaust wind directions of the axial flow fan are consistent with the air inlet and exhaust directions of the ventilation unit.

6. A cooling and ventilation system for long-distance ventilation intervals in a power corridor according to claim 5, characterized in that: The axial flow fan is arranged 2m away from the fire door.

7. A cooling and ventilation system for long-distance ventilation intervals in a power corridor according to claim 5, characterized in that: The wind pressure provided by the axial flow fan is greater than the local resistance of the fire door.

8. According to claim 1, a cooling and ventilation system for long-distance ventilation intervals in a power pipeline corridor is characterized by: The air intake fan and the exhaust fan are both integrated with an atmospheric temperature sensor; the air intake fan and the exhaust fan change the wind speed according to the temperature monitored by the corresponding atmospheric temperature sensor.

9. The long-distance ventilation interval cooling and ventilation system for a power pipe gallery according to claim 1 is characterized by: The air inlet pavilion and the air exhaust pavilion are both provided with rainproof shutters at the places where they are connected to the outside.

10. The long-distance ventilation interval cooling and ventilation system for a power pipeline corridor according to claim 1 is characterized in that: Stainless steel wire mesh is installed above the air inlet fan, exhaust fan and small fan.

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