Combined ventilation and dust reduction equipment

Abstract

The invention discloses combined ventilation and dust reduction equipment which comprises an axial flow fan, an air duct, a spraying device, a booster water pump, a water tank, a central controller and an environment detector. The axial flow fan is connected with one end of the air duct, the other end of the air duct is provided with the spraying device, the spraying device is connected with the booster water pump through the flexible pressure-resistant water pipe, and the booster water pump is connected with the water tank. The central controller is electrically connected with the environment detector, the central controller is electrically connected or in communication connection with the axial flow fan, and the central controller is electrically connected with the booster water pump. The invention provides a combined ventilation and dust fall device which is smaller in occupied space and capable of achieving ventilation and dust fall functions at the same time. And meanwhile, the equipment also has the characteristic of automatic control according to the air quality, and meets the environmental protection requirements of water saving and energy saving.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a combined ventilation and dust reduction device. Background Art

[0002] With the deepening of urbanization and the progress of urban construction, various infrastructure pipelines such as electricity, communications, heat, and water supply have moved from being directly exposed on the ground to being laid underground, which has brought about a strong demand for the construction of small and medium-sized tunnels. Compared with large tunnels used in transportation projects and water diversion projects, the internal space of such tunnels is smaller, and various toxic gases and dust are more likely to gather, posing a serious threat to the safety and health of workers.

[0003] Due to the small working space of small and medium-sized tunnel construction, it is difficult for large environmental protection equipment such as fog cannons to enter the site. Generally, only one fan is used to connect the cloth air duct hanging on the top of the tunnel for forced ventilation to ensure air quality. This method has limited dust reduction effect and cannot be automatically adjusted according to the air quality of the construction site, which does not conform to the trend of intelligent and environmentally friendly construction equipment. Therefore, there is an urgent need for a device with better ventilation and dust reduction effect and that can meet the stringent requirements of small and medium-sized tunnels on the space occupied by equipment. Summary of the invention

[0004] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide a combined ventilation and dust reduction equipment, which occupies less space and can realize ventilation and dust reduction functions at the same time. At the same time, the equipment also has the characteristics of automatic control according to air quality, meeting the environmental protection requirements of water saving and energy saving.

[0005] Technical solution: A combined ventilation and dust reduction device of the present invention includes an axial flow fan, a wind tube, a spray device, a booster water pump, a water tank, a central controller and an environmental detector;

[0006] Among them, the axial flow fan is connected to one end of the wind duct, and the other end of the wind duct is installed with a spray device, the spray device is connected to the booster water pump through a flexible pressure-resistant water pipe, and the booster water pump is connected to the water tank; the central controller is electrically connected to the environmental detector, the central controller is electrically connected or communication connected to the axial flow fan, and the central controller is electrically connected to the booster water pump.

[0007] Furthermore, the environmental detectors include an oxygen concentration detector, a toxic gas concentration detector and a dust concentration detector, and each detector sends the detection result to the central controller.

[0008] Furthermore, an axial flow fan controller is provided on the axial flow fan, and the axial flow fan controller receives a control signal from the central controller, and controls the axial flow fan to operate at a high speed or a low speed according to the control signal.

[0009] Furthermore, a booster water pump controller is provided on the booster water pump, and the booster water pump controller receives a control signal from the central controller, and controls the start or stop of the booster water pump according to the control signal.

[0010] Furthermore, the shape of the spray device is the same as the shape of the air outlet of the air duct, and the nozzles are evenly arranged on the spray device.

[0011] Furthermore, a wireless signal transmitter is provided at the central controller, a wireless signal receiver is provided at the axial flow fan, and at least one wireless signal repeater is provided inside the tunnel to transmit the control signal.

[0012] Furthermore, the DC lighting system in the tunnel is used to transmit control signals between the central controller and the axial flow fans.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0014] 1. The present invention combines ventilation equipment and dust suppression equipment into one, which occupies less space and is more suitable for the narrow working space of small and medium-sized tunnel construction;

[0015] 2. The present invention utilizes the air supply of the ventilation system to increase the flow rate of the water mist of the spray system and the particle size of the water droplets in the water mist, thereby enhancing the dust reduction effect of the device;

[0016] 3. The present invention ensures personnel safety and a good working environment by monitoring the air quality at the construction site, and realizes automatic control of the equipment based on the detection data, thereby reducing the operating load of the equipment and achieving significant water and energy saving effects;

[0017] 4. The present invention can utilize a DC lighting system or a communication device to transmit control signals, which is convenient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the combined ventilation and dust reduction equipment;

[0019] Figure 2 It is a transmission flow chart of control signals in combined ventilation and dust reduction equipment;

[0020] Figure 3 It is the control flow chart of the central controller;

[0021] Figure 4 is a schematic diagram of the structure of the spray device;

[0022] Figure 5 It is a structural diagram of the 8-shaped buckle;

[0023] Figure 6 It is a schematic diagram of a DC circuit scheme for controlling signal transmission;

[0024] Figure 7 It is a schematic diagram of a wireless transmission scheme for controlling signal transmission.

[0025] In the figure, 1 is an axial flow fan, 2 is an air cylinder, 3 is a spray device, 4 is a booster pump, 5 is a water tank, 6 is a central controller, 7 is an environmental detector, 8 is a chassis, 9 is a relay, 10 is a DC power supply, 11 is a voltage measurement and analog-to-digital conversion unit, 12 is a wireless signal receiver, 13 is a wireless signal repeater, and 14 is a wireless signal transmitter. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] The combined ventilation and dust reduction equipment described in this embodiment is applied to small and medium-sized tunnel construction sites, occupies less space and can realize ventilation and dust reduction functions at the same time. At the same time, the equipment also has the characteristics of automatic control according to air quality, meeting the environmental protection requirements of water saving and energy saving. Figure 1 As shown, it includes an axial flow fan 1, a wind tube 2, a spray device 3, a booster water pump 4, a water tank 5, a central controller 6 and an environmental detector 7;

[0028] Among them, the axial flow fan 1 is placed in the open space outside the tunnel entrance, the wind tube 2 is usually made of flexible materials such as cloth, and is suspended on the upper part of the tunnel. The axial flow fan 1 is connected to one end of the wind tube 2, and the other end of the wind tube 2, that is, the air outlet, is installed with a spray device 3, facing the working area in front of the face, and spraying water mist to the working area through the spray device 3. The spray device 3 is connected to the booster water pump 4 through a flexible pressure-resistant water pipe, and the booster water pump 4 is connected to the water tank 5. The booster water pump 4 draws cooling water from the water tank 5 and supplies it to the spray device 3 after boosting. The booster water pump 4 is preferably installed on the top or side of the water tank 5 to reduce the space occupied by this part.

[0029] The central controller 6 is electrically connected to the environmental detector 7, the central controller 6 is electrically connected or communicated to the axial flow fan 1, and the central controller 6 is electrically connected to the booster pump 4. The central controller 6 and the environmental detector 7 are installed in a chassis 8, which should be placed in a suitable position in the construction area to obtain accurate air conditions at the construction site. The environmental detector 7 sends the measured detection data to the central controller 6, and the central controller 6 sends different control signals based on the detection data, and transmits them to the corresponding controllers of the axial flow fan 1 and the booster pump 4 respectively.

[0030] The environmental detector 7 includes an oxygen concentration detector, a toxic gas concentration detector and a dust concentration detector. Each detector sends the detection result to the central controller 6. The detection result includes oxygen concentration, toxic gas concentration and dust concentration. The central controller 6 determines the air condition of the construction site at that time according to the detection result, and sends corresponding control signals to the fan and water pump accordingly. The control signal includes a fan control signal and a water pump control signal, such as Figure 2 shown.

[0031] Furthermore, an axial flow fan controller is provided on the axial flow fan 1, and the axial flow fan controller receives a control signal from the central controller 6, and controls the axial flow fan 1 to run at a high speed or a low speed according to the control signal.

[0032] Furthermore, a booster water pump controller is provided on the booster water pump 4, and the booster water pump controller receives a control signal from the central controller 6, and controls the booster water pump 4 to start or stop according to the control signal.

[0033] like Figure 3 As shown, the control process of the central controller of a combined ventilation and dust reduction device described in this embodiment includes:

[0034] First, the environmental detector 7 is used to monitor the various indicators of the air in the tunnel in real time, including oxygen concentration, toxic gas concentration and dust concentration, and the test results are sent to the central controller 6. The central controller 6 will pre-set the thresholds of various indicators according to the needs of the user, and judge whether each indicator exceeds the standard according to the threshold. If the oxygen content does not meet the standard or the toxic gas and dust exceed the standard, the central controller 6 sends a control signal for the fan to run at high speed. At the same time, if the dust concentration exceeds the standard, a signal for the booster pump 4 to start should be sent at the same time to spray. After the control signal for the fan to run at high speed is sent, an appropriate delay should be performed to avoid frequent start and stop or switching of the axial flow fan. In this embodiment, the delay time is set to 20 minutes. After the delay ends, the environmental detector 7 is continued to be used for air sampling and detection. After all indicators meet the standards, the central controller 6 sends a control signal for the fan to run at low speed, otherwise it enters the delay again, and samples are tested again after the delay ends. Note that the standard used for this detection and judgment should be stricter than the standard when the fan runs at low speed, otherwise the motor used may frequently switch the running state, resulting in a reduced life and an increased failure rate. During sampling and detection, the dust concentration is also judged separately. When the dust concentration is significantly lower than the threshold, a signal to stop the booster pump 4 can be issued, otherwise a signal to start the booster pump 4 can be issued. This control strategy can significantly reduce the operating load of the equipment and reduce the energy consumption and water consumption of the equipment.

[0035] like Figure 4As shown, the shape of the spray device 3 is the same as the shape of the air outlet of the air duct 2, which is usually circular and is installed at the air outlet of the air duct 2 during operation. The spray device 3 can be made of materials such as pressure-resistant PU tubes or aluminum alloy tubes, and atomizing nozzles are evenly arranged along the circumferential direction for spraying. The spray device 3 is connected to the booster water pump 4 to obtain high-pressure water, and is connected to the air outlet of the air duct 2 through a connecting accessory. The connecting accessory can be selected from a Figure 5 The 8-shaped buckle shown in the figure is installed by inserting the annular part of the spray device 3 into the buckle ring at one end of the 8-shaped buckle, and the buckle ring at the other end is inserted into the hole or rope ring of the air outlet. During installation, several places should be fixed to make the spray device 3 and the air outlet tightly connected. When the spray device 3 sprays, the air blowing from the air outlet can increase the speed of the water droplet particles in the water mist and reduce the diameter of the water droplet particles, significantly improving the dust removal effect.

[0036] The axial flow fan 1 and the central controller 6 are generally far apart and cannot be directly connected using conventional methods. Other methods are required to transmit control signals. For this purpose, this example provides Figure 6 and Figure 7 Two options are shown.

[0037] like Figure 6 As shown, the DC lighting system in the tunnel is used to transmit control signals between the central controller 6 and the axial flow fan 1. The specific implementation process is:

[0038] A voltage measuring device and a relay 9 are connected in series in a circuit powered by a DC power supply, and the DC power supply 10 of the lighting system is used to power the circuit. The wires used in the circuit can also be laid together with the lighting line to the front of the face or a backup lighting line can be used. Since the tunnel fan cannot be stopped during the construction project, and a two-speed motor with three-phase power supply is generally used, the control system only needs to control the fan to operate in two states: low speed and high speed. The control signal can be easily represented by the opening and closing of the DC circuit. Therefore, a relay 9 is set on the side of the circuit close to the face and controlled by the central controller 6. A voltage measurement and analog-to-digital conversion unit 11 is set on the side of the circuit close to the tunnel entrance. The measured voltage signal is converted into a digital signal and then transmitted to the axial flow fan controller. This solution is simple to implement and can utilize the DC lighting system. It is low-cost, reliable, and not prone to failure.

[0039] like Figure 7 This is another control signal transmission method that can be used in this embodiment. The specific implementation process is as follows:

[0040] A wireless signal transmitter 14 is provided at the central controller 6, a wireless signal receiver 12 is provided at the axial flow fan 1, and one or more wireless signal repeaters 13 are provided at each node inside the tunnel for signal forwarding. This method realizes communication between the central controller 6 and the axial flow fan 1, and is more flexible and more scalable, and more complex control signals can be transmitted in the future.

Claims

1. A combined ventilation and dust reduction device, characterized in that: It includes an axial flow fan, a wind tube, a spray device, a booster pump, a water tank, a central controller and an environmental detector; Among them, the axial flow fan is connected to one end of the wind duct, and the other end of the wind duct is installed with a spray device, the spray device is connected to the booster water pump through a flexible pressure-resistant water pipe, and the booster water pump is connected to the water tank; the central controller is electrically connected to the environmental detector, the central controller is electrically connected or communication connected to the axial flow fan, and the central controller is electrically connected to the booster water pump.

2. A combined ventilation and dust reduction device according to claim 1, characterized in that: The environmental detectors include oxygen concentration detectors, toxic gas concentration detectors and dust concentration detectors, and each detector sends the test results to the central controller.

3. The combined ventilation and dust reduction equipment according to claim 1, characterized in that: An axial flow fan controller is arranged on the axial flow fan, and the axial flow fan controller receives a control signal from the central controller, and controls the axial flow fan to run at a high speed or a low speed according to the control signal.

4. The combined ventilation and dust reduction equipment according to claim 1, characterized in that: A booster water pump controller is arranged on the booster water pump, and the booster water pump controller receives a control signal from the central controller and controls the start or stop of the booster water pump according to the control signal.

5. The combined ventilation and dust reduction equipment according to claim 1, characterized in that: The shape of the spray device is the same as the shape of the air outlet of the air duct, and nozzles are evenly arranged on the spray device.

6. The combined ventilation and dust reduction equipment according to claim 1, characterized in that: A wireless signal transmitter is arranged at the central controller, a wireless signal receiver is arranged at the axial flow fan, and at least one wireless signal repeater is arranged inside the tunnel to transmit the control signal.

7. The combined ventilation and dust reduction equipment according to claim 1, characterized in that: The DC lighting system in the tunnel is used to transmit control signals between the central controller and the axial flow fans.

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