An optimized ventilation active adjustment device for a tunnel natural ventilation shaft

Abstract

An optimized ventilation active adjustment device for a tunnel natural ventilation shaft, comprising a ventilation valve that can be automatically opened and closed. The ventilation valve is detachably installed at the bottom of the tunnel internal ventilation shaft after the tunnel construction is completed. The ventilation valve includes a frame, a rotating shaft, fan blades, and a thin spring for balancing the self-weight of the fan blades to enhance the sensitivity of the fan blades. The number of the fan blades is the same as the number of the rotating shafts, and the rotating shafts are arranged at intervals. Each fan blade is rotatably installed on the rotating shaft. The axis direction of each rotating shaft is perpendicular to the longitudinal direction of the tunnel and is fixed on the frame. Each fan blade is also installed on the rotating shaft through a thin spring so as to be opened and closed. One end of the thin spring is fixed on the rotating shaft, and the other end of the thin spring is connected to the fan blade. The present invention provides an optimized ventilation active adjustment device for a tunnel natural ventilation shaft, which can realize automatic opening and closing by using the piston wind pressure of vehicles, block the backflow of polluted gas from the ventilation shaft opening to the inside of the tunnel, and effectively improve the tunnel ventilation quality.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel ventilation, and in particular to an optimized ventilation active regulating device for a tunnel natural ventilation shaft. Background Art

[0002] With the development of road traffic and urban infrastructure, a large number of urban underground tunnels have emerged, and with it comes an increase in demand for tunnel ventilation technology. Under natural ventilation conditions, the method of using vehicle piston wind to drive the airflow exchange between the tunnel and the outside world can not only reduce the cost of tunnel construction, but also greatly reduce the operating energy consumption of the tunnel. It is a mature technology for environmental protection and energy saving.

[0003] However, in this mode, after a vehicle passes through the vent, a negative pressure field will be generated behind the vehicle, sucking some of the polluted gas originally discharged from the vent back into the tunnel, reducing the ventilation efficiency. Therefore, the traditional natural ventilation mode still needs to be further optimized. Summary of the invention

[0004] In order to overcome the defect of low ventilation efficiency in existing tunnel ventilation technology, the present invention provides an active ventilation adjustment device for optimizing the natural ventilation shaft of a tunnel, which can realize autonomous opening and closing by utilizing the wind pressure of a vehicle piston, thereby preventing polluted gases from flowing back from the ventilation shaft mouth into the interior of the tunnel, and effectively improving the ventilation quality of the tunnel.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] An optimized ventilation active regulating device for a tunnel natural ventilation shaft comprises a ventilation valve that can be opened and closed automatically, and the ventilation valve is detachably installed at the bottom of the ventilation shaft inside the tunnel after the tunnel construction is completed;

[0007] The ventilation valve comprises a frame, a rotating shaft, a fan blade and a thin spring for balancing the deadweight of the fan blade to enhance the sensitivity of the fan blade. The number of the fan blades is the same as the number of the rotating shafts. The rotating shafts are arranged at intervals. Each fan blade is rotatably mounted on the rotating shaft. The axial direction of each rotating shaft is arranged perpendicular to the longitudinal depth direction of the tunnel and is fixed to the frame. Each fan blade is also mounted on the rotating shaft so as to be opened and closed by a thin spring. One end of the thin spring is fixed to the rotating shaft, and the other end of the thin spring is connected to the fan blade. The spacing between two adjacent rotating shafts is equal to the length of a fan blade.

[0008] When a vehicle passes through the tunnel, the fan blades open under the push of the outward airflow, and the backflow generated by the passing of the vehicle will cause the fan blades to close, forcing fresh air to flow in from the tunnel entrance.

[0009] Furthermore, the frame of the ventilation valve is installed at the bottom of the ventilation shaft inside the tunnel by bolts.

[0010] The beneficial effects of the present invention are mainly manifested as follows: the ventilation valve is fixed at the bottom of the tunnel ventilation shaft by means of bolt connection. When a vehicle passes through the tunnel, the outflowing air current will not be affected, and the backflow generated after the vehicle passes through will be blocked by the ventilation valve, forcing fresh air to flow in from the tunnel entrance, improving the air current exchange rate in the tunnel, and realizing the artificial organization of ventilation for the air current under natural ventilation conditions; the ventilation valve device of the tunnel ventilation shaft of the present invention can effectively improve the natural ventilation effect of the tunnel, and has simple construction, can effectively reduce the project investment, and has strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the working principle of the present invention when a vehicle passes through.

[0012] Figure 2 is a schematic diagram of the working principle of the present invention after a vehicle passes through.

[0013] Figure 3 is a top view of the present invention.

[0014] Figure 4 is a side view of the present invention.

[0015] Figure 5 is a schematic diagram of the detailed structure of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Refer to Figures 1 to 5 , an optimized ventilation active regulation device for a tunnel natural ventilation shaft, comprising a ventilation valve 1 that can be automatically opened and closed, and the ventilation valve 1 is detachably installed at the bottom of the internal ventilation shaft of the tunnel after the tunnel construction is completed;

[0018] The ventilation valve 1 includes a frame, a rotating shaft 2, fan blades, and a thin spring 3 for balancing the self-weight of the fan blades to enhance the sensitivity of the fan blades. The number of the fan blades is the same as the number of the rotating shafts 2, and the rotating shafts 2 are arranged at intervals. Each fan blade is rotatably installed on the rotating shaft 2. The axis direction of each rotating shaft 2 is perpendicular to the longitudinal direction of the tunnel and is fixed on the frame. Each fan blade is also openably and closably installed on the rotating shaft through a thin spring 3. One end of the thin spring 3 is fixed on the rotating shaft, and the other end of the thin spring 3 is connected to the fan blade; the distance between two adjacent rotating shafts is equal to the length of one fan blade.

[0019] Further, the frame of the ventilation valve 1 is installed at the bottom of the internal ventilation shaft of the tunnel through bolts 4.

[0020] In this embodiment, the other end of the thin spring 3 is connected to the fan blade, and the rotating shaft 2 is fixed to the frame and does not rotate with the fan blade.

[0021] When a vehicle passes through the tunnel, the fan blades are opened under the push of the out-flowing air current, i.e., piston wind. The backflow generated after the vehicle passes through will cause the fan blades to close, preventing the air from flowing into the tunnel through the ventilation opening. At the same time, it forces fresh air to flow into the tunnel from the tunnel entrance or other ventilation openings without fan blade devices, improving the air flow exchange rate in the tunnel and realizing the artificial organization of air flow under natural ventilation conditions. There is no manual adjustment and control, no energy consumption, and it greatly saves the energy consumption of forced ventilation by conventional fans.

[0022] This device is detachable and replaceable.

[0023] When this invention is used in the case of a ventilation shaft group, individual wellheads can be selected for separate installation. For ventilation inlets of different sizes, processing can be carried out as required.

Claims

1. A ventilation active adjustment method for an optimized ventilation active adjustment device of a tunnel natural ventilation shaft, characterized in that: The adjusting device includes a ventilation valve that can be automatically opened and closed. The ventilation valve is detachably installed at the bottom of the tunnel internal ventilation after the tunnel construction is completed. The ventilation valve includes a frame, a rotating shaft, fan blades, and a thin spring for balancing the self-weight of the fan blades to enhance the sensitivity of the fan blades. The number of fan blades is the same as the number of rotating shafts. The rotating shafts are arranged at intervals. Each fan blade is rotatably installed on the rotating shaft. The axis direction of each rotating shaft is perpendicular to the longitudinal direction of the tunnel and is fixed on the frame. Each fan blade is also installed on the rotating shaft through a thin spring so as to be opened and closed. One end of the thin spring is fixed on the rotating shaft, and the other end of the thin spring is connected to the fan blade. The distance between two adjacent rotating shafts is equal to the length of one fan blade. The frame of the ventilation valve is installed at the bottom of the tunnel internal ventilation through bolts. The active ventilation adjustment method is as follows: When a vehicle passes through the tunnel, the fan blades are pushed open by the out-flowing air current, i.e., piston wind. After the vehicle passes through, the generated backflow will cause the fan blades to close, blocking the polluted gas from flowing back into the tunnel from the ventilation wellhead, forcing fresh air to flow in from the tunnel entrance, and improving the air flow exchange rate in the tunnel.

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