Ventilation system for tunnel construction

Abstract

The utility model discloses a ventilation system for tunnel construction, and relates to the field of air purification. During use, along with long-time use of an air return pipe, dirt is attached to the inner walls of a plurality of sections of pipe bodies, high-pressure water flow is provided for a main pressure pipe through a booster pump set, and the high-pressure water flow is mixed with airflow under the action of a cavitation generation assembly; high-pressure water flow is combined with mixing of bubbles, a layer of attached clean water flow can be formed on the inner wall of the pipe body of the corresponding pipe section of the air return pipe, a good dirt removing effect can be achieved, airflow is not affected in the cleaning process, full cleaning can be conducted in continuous operation of the whole ventilation system, it is guaranteed that the inner wall of the pipe body is smooth, and the service life of the ventilation system is prolonged. And meanwhile, pipeline corrosion is avoided, and long-term use of the pipe body is guaranteed under non-stop cleaning.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air purification, in particular to a ventilation system for tunnel construction. BACKGROUND

[0002] The ventilation system for tunnel construction is mainly used to remove harmful gases, dust and heat generated during the construction process, to ensure air circulation in the construction site and to protect the health and safety of construction personnel. Its core components include a fan, a ventilation duct and a monitoring system. Fresh air is introduced into the tunnel interior through the power generated by the fan, while waste gas and dust are discharged, maintaining the air quality inside the tunnel.

[0003] However, as one of the common means of dust reduction in tunnel construction, spraying dust reduction is combined with the introduction of fresh air and the extraction of harmful gases by the ventilation system. During this process, the dirt in the exhaust pipe often adheres under the action of humid gas. The adhered dirt reduces the load of the end air purification equipment to some extent, but the long-term accumulation in the pipe not only reduces the air flow rate and increases the motor energy consumption, but also poses a certain risk after the weight of the pipe increases. Some dirt has certain corrosiveness to the pipe wall, which has a certain impact on the service life of the pipe. SUMMARY

[0004] The purpose of the present application is to solve the problem of dirt accumulation and corrosion on the inner wall of the traditional return air duct, and the problem of stopping the ventilation system caused by disassembly and cleaning. A ventilation system for tunnel construction is proposed.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a ventilation system for tunnel construction, comprising a fresh air duct and a return air duct arranged in the tunnel, wherein one end of the fresh air duct and the return air duct is respectively provided with a fresh air purification device and an air filter, a plurality of throttling air gates are arranged on the return air duct and the fresh air duct, a booster pump group is connected to the surface of the return air duct, the return air duct further comprises a plurality of adjacent pipe bodies connected at the ends, one side of the pipe body is provided with a main pressure pipe connected to the booster pump group, two arc-shaped pipes are symmetrically arranged at the two ends of the pipe body, and a plurality of pairs of pipe body inner wall flushing sub-pressure pipes are connected to the opposite surfaces of the two arc-shaped pipes, a cavitation generation assembly for enhancing the cleaning efficiency of the inner wall of the pipe body is installed at one end of the arc-shaped pipe, the arc-shaped pipe is connected to the main pressure pipe through an electromagnetic valve, and a blowdown pipe is arranged at the bottom of the pipe body. After the high-pressure water flow in the main pressure pipe passes through the cavitation generation assembly and mixes with air bubbles, it forms a flushing water flow close to the inner wall of the pipe body.

[0006] As a further description of the above technical scheme: the arc-shaped pipe comprises an arc pipe body fixed to the outer wall of the pipe body, the surface of the arc pipe body is provided with a liquid inlet connected to one end of the electromagnetic valve, and a plurality of liquid outlets connected to the sub-pressure pipes are also provided.

[0007] As a further description of the above technical solution: the cavitation generation assembly includes a gas chamber communicated with one end of the arc tube body, an air inlet pipe is arranged through the inner wall of the gas chamber, the air inlet pipe is arranged axially at one end of the arc tube body, the inner wall of the gas chamber is fixed with a seal seat supporting the air inlet pipe, one side of the seal seat is fixed with a spring, the other end of the spring is provided with a seal ball, and the inner wall of the gas chamber is fixedly connected with a seal ring matched with the seal ball.

[0008] As a further description of the above technical solution: a plurality of guide pipes are mounted on the surface of the pressure distribution pipe, and the guide pipes are inclined and communicated with the inner wall of the pipe body.

[0009] As a further description of the above technical solution: a plurality of sewage discharge holes are arranged in the pipe body for discharging sewage, a flow collecting cover for collecting sewage is arranged below the sewage discharge holes, and the flow collecting cover is fixed to the side wall of the pipe body.

[0010] As a further description of the above technical solution: a water outlet pipe is mounted on the surface of the sewage discharge pipe, and the top end of the water outlet pipe is communicated with the flow collecting cover.

[0011] As a further description of the above technical solution: the two ends of the pipe body are provided with connecting flanges for mounting, and the inner wall of the connecting flange is provided with a partition ring, which is arranged in an inclined manner.

[0012] As described above, due to the adoption of the above technical solution, the beneficial effects of the present application are:

[0013] In use, the inner walls of the several pipe bodies of the return air pipe are contaminated after long-term use, the booster pump group provides high-pressure water flow to the main pressure pipe, the electromagnetic valves corresponding to the different pipe bodies of the return air pipe are opened in turn, the high-pressure water flow enters the arc-shaped pipe, and high pressure is formed in the arc-shaped pipe, the high-pressure water flow enters the three pressure distribution pipes in turn, and the water pressure gradually decreases in the three pressure distribution pipes, the guide pipe on the surface of the first pressure distribution pipe has a vertical upward inclination angle, the second guide pipe has a horizontal rightward inclination angle, and the third guide pipe has a downward inclination angle, so that the water pressure of the first guide pipe is the largest, the water flow in the vertical direction can maintain sufficient water pressure to adhere to the inner wall of the pipe body, the water pressure of the second guide pipe is reduced, but the water flow in the horizontal direction still has sufficient flushing force, and the water flow of the last pressure distribution pipe is flushed downward.

[0014] Meanwhile, during the cleaning of the scheme, the initial end of the arc tube body of the arc tube flows fast under the large water pressure, and the head end of the arc tube body is provided with the gas inlet pipe based on the axial direction, the high-pressure water flow initially enters the surface of the gas inlet pipe and flows leftward at high speed, and forms siphon when flowing through the end of the gas inlet pipe, so that the other end of the gas inlet pipe forms negative pressure in the air chamber after passing through the seal seat, external air enters the air chamber by pressing the spring through the seal ball, and is uniformly mixed with the high-pressure water flow after passing through the gas inlet pipe, and enters the plurality of pressure distribution pipes in turn, so that the water flow can be more efficiently cleaned under the action of cavitation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a brief architecture diagram of the ventilation system of the application;

[0016] Figure 2 is a partial structure diagram of the return air pipe of the application;

[0017] Figure 3 is a structure diagram of a pipe section of the return air pipe of the application;

[0018] Figure 4 is a structure diagram of the cross section of the pipe body of the application;

[0019] Figure 5 is a structure diagram of the cross section of the pipe body of the application;

[0020] Figure 6 is a structure diagram of the cross section of the pipe body of the application;

[0021] Figure 7 is a structure diagram of the cross section of the pipe body of the application;

[0022] Figure 8 is a structure diagram of the cross section of the pipe body of the application;

[0023] Legend:

[0024] 1, pipe body; 2, arc tube; 21, arc tube body; 22, liquid inlet; 23, liquid outlet; 3, pressure distribution pipe; 4, cavitation generation assembly; 41, air chamber; 42, seal seat; 43, seal ring; 44, gas inlet pipe; 45, spring; 46, seal ball; 5, main pressure pipe; 6, blowdown pipe; 7, water outlet pipe; 8, electromagnetic valve; 9, current collecting cover; 10, guide pipe; 11, partition ring; 12, connecting flange; 13, blowdown hole. DETAILED DESCRIPTION

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0026] As shown in Figures 1-8 The present application provides a ventilation system for tunnel construction, which comprises a fresh air pipe and a return air pipe arranged in the tunnel, a fresh air purification device and an air filter arranged at one end of the fresh air pipe and the return air pipe respectively, a plurality of throttling air gates arranged on the return air pipe and the fresh air pipe, a booster pump group communicated with the surface of the return air pipe, and a plurality of pipe bodies 1 communicated at adjacent ends, wherein one side of the pipe body 1 is provided with a main pressure pipe 5 communicated with the booster pump group, two arc-shaped pipes 2 are symmetrically arranged at both ends of the pipe body 1, and a plurality of pairs of sub-pressure pipes 3 for flushing the inner wall of the pipe body 1 are commonly communicated with the opposite surfaces of the two arc-shaped pipes 2, a cavitation generation assembly 4 for enhancing the cleaning efficiency of the inner wall of the pipe body 1 is arranged at one end of the arc-shaped pipe 2, the arc-shaped pipe 2 is communicated with the main pressure pipe 5 through an electromagnetic valve 8, and a blowdown pipe 6 is arranged at the bottom of the pipe body 1, and the high-pressure water flow in the main pressure pipe 5 forms a flushing water flow after mixing with air bubbles through the cavitation generation assembly 4 and closely adhering to the inner wall of the pipe body 1.

[0027] Through the specific inclination angle design of the high-pressure water flow and the guide pipe 10, the water flow forms a rotating and adhering high-pressure water flow in the inner wall of the pipe body 1, and the tiny air bubbles generated by the cavitation effect impact, effectively stripping and discharging the dirt attached to the inner wall. This design enables the water flow to maintain sufficient flushing force in the vertical, horizontal and inclined pipe sections, and combines the centrifugal force to push the dirt to the blowdown hole 13 to achieve automatic blowdown, thereby finally achieving efficient, uniform and automatic inner wall cleaning effect, and solving the technical problem that the dirt accumulated in the return air pipe after long-term use is difficult to clean.

[0028] Specifically, as shown in Figure 2 The arc-shaped pipe 2 comprises an arc pipe body 21 fixed to the outer wall of the pipe body 1, the surface of the arc pipe body 21 is provided with a liquid inlet 22 communicated with one end of the electromagnetic valve 8, and a plurality of liquid outlets 23 communicated with the sub-pressure pipes 3 are also provided.

[0029] The liquid inlet 22 of the arc pipe body 21 can be communicated with the electromagnetic valve 8, and the communication control can be performed, and the uniform distribution of the liquid outlets 23 keeps the communication with the sub-pressure pipes 3.

[0030] Specifically, as shown in Figure 6As shown: cavitation occurs assembly 4 includes the arc tube body 21 one end of the communication of the gas chamber 41, the inner wall of the gas chamber 41 is provided with a gas inlet pipe 44, the gas inlet pipe 44 is axially arranged in one end of the arc tube body 21, the inner wall of the gas chamber 41 is fixed with the support of the gas inlet pipe 44 sealing seat 42, one side of the sealing seat 42 is fixed with the spring 45, the other end of the spring 45 is provided with a sealing ball 46, the inner wall of the gas chamber 41 is fixedly connected with the sealing ring 43 matched with the sealing ball 46.

[0031] The cavitation occurs assembly 4 in the scheme utilizes the high pressure water flow in the surface of the gas inlet pipe 44 high speed flow, through the siphon effect generated by the end of the gas inlet pipe 44 produces negative pressure, thereby inhaling the outside air and mixing it evenly into the water flow, and then produces cavitation effect in the arc tube 2. This cavitation process forms a large number of tiny bubbles, when the bubble contacts the inner wall of the pipe body 1 will rupture, produce local impact force, thereby further enhancing the scouring effect of water flow on the inner wall of the pipe body 1. This cavitation assisted cleaning mechanism not only accelerates the dirt peeling, but also enhances the cleaning ability of the water flow, so that the water flow can maintain high cleaning efficiency under lower water pressure, improve the effectiveness and reliability of the scheme in cleaning stubborn dirt.

[0032] Wherein the spring 45 keeps the sealing ball 46 elastically attached to the surface of the sealing ring 43, keeps stopping cleaning, the water flow will not flow out, can introduce external air under negative pressure state, has good effect of air inlet and no water outlet.

[0033] The gas inlet pipe 44 is fixedly kept in the axial position of the arc tube body 21 through the surface of the sealing seat 42, and is kept sealed. Only the gas inlet pipe 44 is kept in communication.

[0034] Specifically, as shown in the figure: Figure 2 As shown: the surface of the pressure distribution pipe 3 is provided with a plurality of guide pipes 10, which are inclined and communicated with the inner wall of the pipe body 1.

[0035] The scheme realizes the scouring and cleaning of the inner wall of the pipe body 1 by forming a rotating high pressure attached water flow on the inner wall of the pipe body 1 in each section of the return air pipe through the high pressure water flow combined with the angle design of the pressure distribution pipe 3 and the guide pipe 10. Especially through the step-by-step water pressure reduction design of the pressure distribution pipe 3, it ensures that the guide pipes 10 of different angles form the most suitable cleaning effect on each pipe section under the condition of limited water pressure in long distance transportation, that is, the water pressure is reasonably distributed in different directions such as vertical, horizontal and inclined, and the water flow can uniformly and strongly attach to and scour the inner wall of the pipe body 1 to remove stubborn dirt.

[0036] Specifically, as shown in the figure: Figure 4 As shown: a plurality of sewage discharge holes 13 are arranged in the pipe body 1 for discharging sewage, and a flow collector 9 for collecting sewage is arranged below the sewage discharge holes 13. The flow collector 9 is fixed to the side wall of the pipe body 1.

[0037] The rotating water flow pushes the dirt to the drain hole 13 under the action of centrifugal force and is efficiently discharged through the drain hole 13, so that the cleaning process is efficient and complete, the frequency and difficulty of manual maintenance are reduced, and the automation level of the equipment is improved

[0038] Specifically, as shown in Figure 2 The surface of the drain pipe 6 is provided with a water outlet pipe 7, and the top end of the water outlet pipe 7 is in communication with the lightning arrester 9.

[0039] The drain pipe 6 is in communication with the lightning arrester 9 through the water outlet pipe 7, and the cleaning sewage of the plurality of pipe sections of the return air pipe can be uniformly discharged and treated through the drain pipe 6.

[0040] Specifically, as shown in Figure 7 The two ends of the pipe body 1 are provided with connecting flanges 12 for installation, and the inner wall of the connecting flange 12 is provided with a partition ring 11, which is arranged in an inclined manner.

[0041] The connecting flange 12 can fix the adjacent tank body to form a return air pipe, and the partition ring 11 is arranged in an inclined annular shape, which can block the flowing water attached to the inner wall of the pipe body 1, and keep the adjacent pipe bodies 1 independent and not interfere with each other.

[0042] In use, after the return air pipe is used for a long time, the inner wall of the plurality of pipe sections 1 is attached with dirt, the booster pump set provides high-pressure water flow to the main pressure pipe 5, and then the electromagnetic valves 8 corresponding to the different pipe bodies 1 of the return air pipe are opened in turn, so that the high-pressure water flow enters the arc-shaped pipe 2, and forms a high-pressure water flow in the arc-shaped pipe 2. The initial end of the arc pipe body 21 of the arc-shaped pipe 2 has a relatively high flow rate under a relatively large water pressure, and the head end of the arc pipe body 21 occupies space based on the axially arranged air inlet pipe 44. The initially entered high-pressure water flow flows at a high speed on the left surface of the air inlet pipe 44, and forms a siphon when flowing through the end of the air inlet pipe 44, so that the other end of the air inlet pipe 44 passes through the seal seat 42 to form a negative pressure in the air chamber 41. The external air enters the air chamber 41 by pressing the spring 45 through the seal ball 46, and is uniformly mixed with the high-pressure water flow after passing through the air inlet pipe 44, and enters the plurality of pressure distribution pipes 3 in turn, as shown in Figure 5 and Figure 6 The high-pressure water flow enters the three pressure distribution pipes 3 in turn, and the water pressure gradually decreases when entering the three pressure distribution pipes 3. The guide pipe 10 on the surface of the first pressure distribution pipe 3 has a vertical upward inclination angle, the second one has a horizontal right inclination angle, and the third one has a downward inclination angle, combined with Figure 4The first guide pipe 10 is shown in the figure, and the water pressure of the first guide pipe 10 is maximized to keep the water flow in the vertical direction to have sufficient water pressure to adhere to the inner wall of the pipe body 1, and the water pressure of the second guide pipe 10 corresponding to the second pressure distribution pipe 3 is reduced, but the water flow in the horizontal direction still has sufficient scouring force, and finally the water flow is flushed downward by the last pressure distribution pipe 3. The scheme can form a layer of adhered water flow on the inner wall of the pipe body 1 corresponding to the return air pipe, and the inner wall of the pipe body 1 can be cleaned.

[0043] In the above working process, a uniform and rapid flushing water flow is formed on the inner wall of the pipe body 1, and the water flow is in a rotating state. Part of the water flow passes through the drain hole 13 under the action of centrifugal force, and the dirt adhered to the inner wall of the tank after being flushed moves under the action of centrifugal force. Most of the dirt is discharged through the drain hole 13. The water flow continues to rotate on the inner wall of the pipe body 1 until the electromagnetic valve 8 is closed. The water flow loses power and gathers at the bottom under the action of gravity and enters the collecting cover 9. Finally, the water flow enters the drain pipe 6 through the water outlet pipe 7 to complete the cleaning.

[0044] The guide pipe 10 on the surface of the pressure distribution pipe 3 is inclined to communicate with the inner wall of the pipe body 1, so that the water flow adheres to the inner wall of the pipe body 1 under the action of kinetic energy and rotates. Further, the guide pipe 10 can be inclined to the other side in a second direction in addition to being inclined in one direction, such as Figure 8 The left figure is an embodiment of the scheme, and the right figure is another embodiment. The difference is that the water flow formed is a rotating water flow and a spiral water flow, respectively.

[0045] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A ventilation system for tunnel construction, comprising a fresh air duct and a return air duct set up in the tunnel, wherein one end of the fresh air duct and the return air duct are respectively provided with a fresh air purification device and an air filter, and the return air duct and the fresh air duct are provided with multiple throttling dampers, and the surface of the return air duct is connected to a booster pump group, characterized in that: The return air pipe further comprises a plurality of pipe bodies (1) in communication with each other, one side of the pipe body (1) is provided with a main pressure pipe (5) in communication with a booster pump set, two arc-shaped pipes (2) are symmetrically arranged at both ends of the pipe body (1), and opposite surfaces of the two arc-shaped pipes (2) are jointly communicated with a plurality of pairs of sub-pressure pipes (3) for flushing the inner wall of the pipe body (1), one end of the arc-shaped pipe (2) is provided with a cavitation generation assembly (4) for enhancing the cleaning efficiency of the inner wall of the pipe body (1), the arc-shaped pipe (2) is communicated with the main pressure pipe (5) through an electromagnetic valve (8), and the bottom of the pipe body (1) is provided with a blow-off pipe (6), and the high-pressure water flow in the main pressure pipe (5) is mixed with bubbles after passing through the cavitation generation assembly (4) and then closely adheres to the inner wall of the pipe body (1) to form a flushing water flow.

2. A ventilation system for tunnel construction according to claim 1, characterized in that The arc-shaped pipe (2) comprises an arc pipe body (21) fixed to the outer wall of the pipe body (1), and the arc pipe body (21) is provided with a liquid inlet (22) in communication with one end of the electromagnetic valve (8) and a plurality of liquid outlets (23) in communication with the sub-pressure pipes (3).

3. A ventilation system for tunnel construction according to claim 2, characterized in that The cavitation generation assembly (4) comprises a gas chamber (41) in communication with one end of the arc pipe body (21), the inner wall of the gas chamber (41) is provided with a gas inlet pipe (44) penetrating through, the gas inlet pipe (44) is axially arranged at one end of the arc pipe body (21), the inner wall of the gas chamber (41) is fixedly provided with a sealing seat (42) supporting the gas inlet pipe (44), one side of the sealing seat (42) is fixedly provided with a spring (45), the other end of the spring (45) is provided with a sealing ball (46), and the inner wall of the gas chamber (41) is fixedly connected with a sealing ring (43) in sealing abutment with the sealing ball (46).

4. The ventilation system for tunnel construction according to claim 1, wherein The surface of the sub-pressure pipe (3) is provided with a plurality of guide pipes (10) in communication with the inner wall of the pipe body (1) in an inclined manner.

5. The ventilation system for tunnel construction according to claim 1, wherein A plurality of blow-off holes (13) for discharging sewage are arranged in the pipe body (1), a flow collecting cover (9) for collecting sewage is arranged below the blow-off hole (13), and the flow collecting cover (9) is fixed to the side wall of the pipe body (1).

6. A ventilation system for tunnel construction according to claim 5, characterized in that The surface of the blow-off pipe (6) is provided with a water outlet pipe (7) in communication with the flow collecting cover (9).

7. The ventilation system for tunnel construction of claim 1, wherein, Both ends of the pipe body (1) are provided with connecting flanges (12) for mounting, and the inner wall of the connecting flange (12) is provided with a partition ring (11) arranged in an inclined manner.

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