Tunnel ventilation device

Abstract

The utility model provides a tunnel ventilation device, which belongs to the technical field of tunnel construction and comprises a ventilation pipeline and a fan, the ventilation pipeline is arranged along the length extension direction of a tunnel, and the fan is arranged at one end of the ventilation pipeline extending out of the tunnel and used for introducing air into the ventilation pipeline; an airflow pressurizing section is arranged on the side, away from the draught fan, of the ventilation pipeline, and the diameter of the airflow pressurizing section is smaller than that of other positions of the ventilation pipeline. A telescopic section is arranged on the ventilation pipeline and is used for adjusting the length of the ventilation pipeline; the ventilation pipeline is communicated with humidifying equipment which is used for increasing the humidity of air introduced into the tunnel so as to reduce dust; the problems that in an existing tunnel ventilation mode, energy consumption is large, ventilation and construction progress are not matched, and dust emission is difficult are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tunnel construction technical field, concretely relates to a tunnel ventilation device. BACKGROUND

[0002] In the tunnel construction process, in order to ensure that the environmental conditions such as air quality, visibility and temperature in the tunnel meet the construction requirements, the tunnel usually needs to be ventilated.

[0003] The common ventilation construction mode is the combination of ventilation duct and fan. The ventilation duct is laid along the extension direction of the tunnel, and the fan is fixedly connected to the end of the ventilation duct extending to the outside of the tunnel. The fan transports fresh air outside the tunnel to the inside of the tunnel through the ventilation duct. With the continuous inlet of external air, the internal pressure of the tunnel rises, and then the dirty air inside is discharged, so as to promote the airflow in the tunnel and improve the construction environment inside the tunnel.

[0004] However, as the tunnel construction continuously advances, the ventilation duct needs to increase the duct segment at the end close to the construction surface to realize overall extension, so as to ensure that the external fresh air can be timely delivered to the construction position. However, the existing ventilation mode has the following three problems:

[0005] (1) Energy consumption problem: after the extension of the construction duct, the flow path of the air in the duct increases, and the pressure loss increases, which easily leads to the reduction of the wind speed at the end. If the wind speed is to be increased, the fan power can only be increased, thereby increasing the energy consumption.

[0006] (2) Ventilation and construction progress matching problem: when the ventilation duct is extended by increasing the duct segment at the end, since the newly added duct segment has a fixed length, only when the construction distance exceeds the length of the duct, the duct segment can be increased. This makes the external fresh air unable to closely follow the construction progress, resulting in insufficient ventilation of the construction area in some periods during the construction process.

[0007] (3) Dust emission problem: dust is easily generated during the construction process, and when the tunnel is excavated deep, the dust cannot be timely discharged with the airflow, which easily causes safety hazards and threatens the health and safety of the construction personnel.

[0008] Therefore, it is necessary to provide an improved technical scheme for the above-mentioned problems of the prior art. UTILITY MODEL CONTENT

[0009] The utility model aims at providing a tunnel ventilation device to solve the problems of large energy consumption, poor matching between ventilation and construction progress and difficult dust emission in the existing tunnel ventilation mode.

[0010] In order to achieve the above object, the tunnel ventilation device provides the following technical scheme:

[0011] A tunnel ventilation device, comprising a ventilation duct and a fan, the ventilation duct is arranged along the extension direction of the tunnel length, and the end of the ventilation duct extending out of the tunnel is provided with the fan for introducing air into the ventilation duct;

[0012] The side of the ventilation duct away from the fan is provided with an airflow booster section, and the diameter of the airflow booster section is smaller than that of other positions of the ventilation duct;

[0013] The ventilation duct is provided with an extension section for adjusting the length of the ventilation duct;

[0014] The ventilation duct is communicated with a humidification device for increasing the humidity of the air entering the tunnel to reduce dust.

[0015] As a further optimized technical scheme, the airflow booster section comprises:

[0016] The constant diameter zone has a constant diameter and is located in the middle of the airflow booster section;

[0017] The guide zone is arranged on the side of the constant diameter zone close to the fan, and the diameter of the guide zone gradually decreases in the extension direction from the fan to the constant diameter zone;

[0018] The diffusion zone is arranged on the side of the constant diameter zone away from the fan, and the diameter of the diffusion zone gradually increases in the extension direction from the fan to the constant diameter zone.

[0019] As a further optimized technical scheme, the humidification device is arranged in communication with the diffusion zone through a humidification duct.

[0020] As a further optimized technical scheme, the end of the ventilation duct extending out of the tunnel is provided with an air inlet cylinder, one end of the air inlet cylinder is fixedly communicated with the ventilation duct, and the other end is arranged with the fan.

[0021] As a further optimized technical scheme, a support frame for supporting the air inlet cylinder is arranged below the air inlet cylinder.

[0022] As a further optimized technical scheme, the extension section comprises:

[0023] The corrugated extension pipe is fixedly communicated with the ventilation duct through the connecting joints at both ends;

[0024] The length adjustment structure is connected with the connecting joints at both ends for adjusting the distance between the two connecting joints to adjust the extension degree of the corrugated pipe.

[0025] As a further optimization technical scheme, the length adjusting structure is a screw rod, the screw rod passes through the connecting joint at two ends and is in sliding fit with the connecting joint, and nuts are threadedly connected with the screw rod on two sides of each connecting joint to limit the relative position of the connecting joint and the screw rod.

[0026] As a further optimization technical scheme, the screw rod is provided with a sliding adjusting support to ensure the stability of the corrugated pipe after the expansion.

[0027] As a further optimization technical scheme, the adjusting support comprises:

[0028] A connecting block is sleeved on the screw rod and is in sliding fit with the screw rod;

[0029] A fixing component is fixedly connected with the tunnel, and the connecting block is clamped at the bottom of the fixing component and is in sliding fit with the fixing component.

[0030] As a further optimization technical scheme, limit stop blocks are arranged at two ends of the fixing component to stop the connecting block.

[0031] Beneficial effects:

[0032] (1) The airflow pressurization section is arranged, the airflow speed is increased by utilizing the Venturi effect, the problem of reduced airflow speed caused by the lengthened ventilation pipeline is solved without increasing the power of the fan, and energy consumption is reduced.

[0033] (2) The expansion section can adjust the length of the ventilation pipeline in real time according to the construction progress, so that the ventilation is closely matched with the construction progress, and the situation that the ventilation of the construction area is insufficient in some periods during the construction process is effectively avoided.

[0034] (3) The humidification equipment is arranged to increase the humidity of the air entering the tunnel, so that the dust is settled and the dust concentration is reduced, and the health and safety of the construction personnel are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0035] The drawings accompanying the specification provide further understanding of the present application, the schematic embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application. Among them:

[0036] Figure 1 It is a schematic diagram of the overall structure of the embodiment 1 of the present application;

[0037] Figure 2 It is Figure 1 It is an enlarged schematic diagram of the expansion section;

[0038] Figure 3 It is a schematic diagram of the overall structure of the embodiment 2 of the present application.

[0039] In the diagram: 1. Ventilation duct; 2. Fan; 3. Airflow pressurization section; 31. Constant diameter zone; 32. Guide zone; 33. Diffusion zone; 4. Humidification equipment; 5. Telescopic section; 51. Corrugated telescopic pipe; 52. Connecting joint; 53. Length adjustment structure; 54. Nut; 55. Connecting block; 56. Fixing component; 57. Limiting block; 6. Humidification duct; 7. Air inlet duct; 8. Support frame; 9. Air guide hood. Detailed Implementation

[0040] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art are within the protection scope of this utility model.

[0041] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected" and "linked" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0042] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0043] The shapes and sizes of the components in the attached drawings do not reflect the actual proportions of the product; they are only intended to illustrate the content of this utility model.

[0044] Example 1

[0045] like Figures 1-2 As shown, the tunnel ventilation system includes a ventilation duct 1 and a fan 2. The ventilation duct 1 is arranged along the length of the tunnel. An air inlet duct 7 is installed at one end of the ventilation duct 1 extending out of the tunnel. One end of the air inlet duct 7 is fixedly connected to the ventilation duct 1, and the other end is fixedly connected to the air outlet of the fan 2, for introducing air into the ventilation duct 1. A support frame 8 is installed below the air inlet duct 7 to provide stable support for the air inlet duct 7 and the fan 2.

[0046] By setting the air flow booster section 3 at a position of the ventilation duct 1 away from the fan 2 and with a smaller diameter than other positions of the ventilation duct 1, the air flow speed can be increased without increasing the power of the fan 2 by using the Venturi effect, effectively solving the problem of energy consumption.

[0047] Meanwhile, the ventilation duct 1 is provided with the telescopic section 5, which can adjust the length of the ventilation duct 1 in real time according to the construction progress, so that the ventilation closely follows the construction progress, solving the problem of matching ventilation with construction progress.

[0048] In addition, the ventilation duct 1 is connected with the humidification device 4, and the humidification device 4 is connected with the ventilation duct 1 through the humidification duct 6, which can increase the humidity of the air entering the tunnel, make the dust settle down, reduce the dust concentration, and solve the problem of dust emission.

[0049] In this embodiment, the humidification device 4 can select a suitable type and specification of humidification device 4 according to the dust concentration, distribution and ventilation volume in the tunnel, such as an ultrasonic humidifier or a centrifugal humidifier. The humidification duct 6 is made of corrosion-resistant plastic or metal material, and the pipe diameter is designed according to the water output of the humidification device 4 and the air flow speed in the ventilation duct.

[0050] In this embodiment, the air flow booster section 3 includes the constant diameter section 31, the guide section 32 and the diffusion section 33.

[0051] The diameter of the constant diameter section 31 is constant, and it is in the middle of the air flow booster section 3 to ensure stable acceleration of the air flow in the middle of the booster section. The guide section 32 is arranged on the side of the constant diameter section 31 close to the fan 2, and the diameter of the guide section 32 gradually decreases from the fan 2 to the constant diameter section 31 in the extension direction, guiding the air flow to gradually accelerate into the constant diameter section 31. The diffusion section 33 is arranged on the side of the constant diameter section 31 away from the fan 2, and the diameter of the diffusion section 33 gradually increases from the fan 2 to the constant diameter section 31 in the extension direction, for smoothly diffusing the accelerated air flow and further optimizing the air flow state.

[0052] In this embodiment, the humidification device 4 is arranged in communication with the diffusion section 33, which has the following advantages.

[0053] Firstly, after acceleration by the air flow booster section 3, the air flow speed in the diffusion section 33 is still high. When the humidification device 4 is in communication with the diffusion section 33, the high-speed air flow can quickly take away the water vapor provided by the humidification device 4.

[0054] Secondly, the air in the diffusion zone 33 is in a state of transition from high speed to normal speed, and the pressure is also adjusted accordingly. This change in pressure and flow rate is conducive to better diffusion of the water vapor generated by the humidification device 4. Compared with other positions, the use of the air flow characteristics at the diffusion zone 33 where the humidification device 4 is connected can make the water vapor more efficiently mixed with the air. For example, if the humidification device 4 is connected at other positions of the ventilation duct 1, such as the constant diameter section away from the fan 2 or the end of the duct, the water vapor may not be able to diffuse quickly throughout the ventilation airflow due to the lower air flow rate or the lack of conditions conducive to mixing as in the diffusion zone 33, thereby affecting the humidification efficiency.

[0055] Finally, the density of the humidified air will increase, and when the humidified air enters the normal pipe diameter part of the ventilation duct 1 after being connected to the humidification device 4 at the diffusion zone 33, the air pressure distribution in the entire ventilation duct 1 can be further optimized due to the synergistic effect of the change in air density and the structure of the diffusion zone 33. This optimized air pressure distribution helps to maintain or even enhance the pressurization effect brought by the airflow pressurization section 3 to some extent, so that the air can be delivered to the inside of the tunnel at a more reasonable speed and pressure, improving the overall performance of the ventilation system.

[0056] The end of the ventilation duct 1 extending out of the tunnel is provided with an air inlet cylinder 7, one end of which is fixedly connected to the ventilation duct 1, and the other end is arranged with the fan 2. The air inlet cylinder 7 can preliminarily guide the air sucked by the fan 2 to improve the air inlet efficiency. A support frame 8 for supporting the air inlet cylinder 7 is arranged below the air inlet cylinder 7 to ensure the stability of the air inlet cylinder 7 and the fan 2.

[0057] As shown in FIG. 1, the ventilation duct 1 includes a constant diameter section 31, an airflow pressurization section 3, a telescopic section 5, and a constant diameter section 32. Figure 2 The telescopic section 5 includes a corrugated telescopic pipe 51 and a length adjustment structure 53.

[0058] The corrugated telescopic pipe 51 is made of high-strength and wear-resistant materials such as stainless steel, and is fixedly connected to the ventilation duct 1 through the connecting joints 52 at both ends. In this embodiment, the connecting joints 52 are fixed to the ventilation duct 1 and the corrugated telescopic pipe 51 by welding or bolt connection, ensuring the sealing of the ventilation.

[0059] The length adjustment structure 53 is connected to the connecting joints 52 at both ends, and can flexibly adjust the distance between the two connecting joints 52, thereby accurately controlling the extension and contraction of the corrugated telescopic pipe 51 and realizing real-time and accurate adjustment of the length of the ventilation duct 1. Specifically, the length adjustment structure 53 is designed as a screw rod, the screw rod passes through the connecting joints 52 at both ends and forms a sliding fit with them, and nuts 54 are threadedly connected to the screw rod on both sides of each connecting joint 52. By rotating the nuts 54, the relative position of the connecting joints 52 and the screw rod can be easily defined, thereby accurately controlling the length of the telescopic section 5.

[0060] In addition, to ensure the stability of the ventilation duct after the corrugated pipe expands and contracts, a sliding adjustment bracket is installed on the top screw. This adjustment bracket includes a connecting block 55 and a fixing component 56. The connecting block 55 is fitted onto the screw and slides smoothly with it, while the fixing component 56 is firmly fixed to the tunnel wall. The connecting block 55 is tightly engaged with the bottom of the fixing component 56 and slides with it. Simultaneously, limit stops 57 are provided at both ends of the fixing component 56 to prevent excessive sliding of the connecting block 55, ensuring the safety and reliability of the entire expansion section 5 during operation. This design of the expansion section 5 allows the connecting block 55 to slide relative to the position of the corrugated expansion pipe 51 after adjustment, ensuring that the connecting block 55 is approximately in the middle of the expansion section 5, thus guaranteeing the balance and stability of the expansion section 5.

[0061] The overall structural design of the expansion section 5 enables the ventilation duct 1 to flexibly and accurately adjust its length according to the real-time progress of tunnel construction, ensuring that fresh external air always closely follows the construction front line. This completely solves the problem of mismatch between ventilation and construction progress, provides construction personnel with a continuous and stable good working environment, and effectively guarantees the efficient progress of construction.

[0062] Example 2

[0063] like Figure 3 As shown, this embodiment provides a technical solution with different fan configuration methods. In this embodiment, all other technical solutions are the same as in Embodiment 1, and will not be described in detail here.

[0064] In this embodiment, one end of the air inlet duct 7 is fixedly connected to the ventilation duct 1, and the other end is spaced apart from the air outlet of the fan 2. At this time, the fan 2 is not directly connected. A guide shroud 9 is installed at the air outlet of the fan 2. The diameter of the guide shroud 9 is smaller than the diameter of the air inlet duct 7. According to Bernoulli's principle, when the fan 2 concentrates and blows air rapidly into the air inlet duct 7 under the action of the guide shroud 9, the airflow velocity at the air outlet is very high. According to Bernoulli's principle, the pressure is low where the airflow velocity is high. Therefore, around the air outlet, due to the high airflow velocity, its pressure is lower than the pressure of the surrounding still air. This causes the surrounding air to tend to flow towards the air outlet, thereby further increasing the efficiency of airflow entering the ventilation duct 1.

[0065] In summary, this utility model optimizes the tunnel ventilation system from multiple aspects through the coordinated operation of its various structural components, significantly improving the overall performance of tunnel ventilation and providing comprehensive and reliable ventilation assurance for tunnel construction.

[0066] It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0067] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A tunnel ventilation device, characterized in that The ventilation duct (1) is arranged along the extension direction of the tunnel length, and the end of the ventilation duct (1) extending out of the tunnel is provided with a fan (2) for introducing air into the ventilation duct (1); The side of the ventilation duct (1) away from the fan (2) is provided with an air flow booster section (3), and the diameter of the air flow booster section (3) is smaller than that of other positions of the ventilation duct (1); The ventilation duct (1) is provided with an expansion section (5) for adjusting the length of the ventilation duct (1); The ventilation duct (1) is communicated with a humidification device (4) for increasing the humidity of the air entering the tunnel to reduce dust.

2. The tunnel ventilation device of claim 1, wherein, The air flow booster section (3) comprises: A constant diameter section (31) with a constant diameter and located in the middle of the air flow booster section (3); A guide section (32) arranged on the side of the constant diameter section (31) close to the fan (2), the diameter of the guide section (32) gradually decreases from the fan (2) to the constant diameter section (31) in the extension direction; A diffusion section (33) arranged on the side of the constant diameter section (31) away from the fan (2), the diameter of the diffusion section (33) gradually increases from the fan (2) to the constant diameter section (31) in the extension direction.

3. The tunnel ventilation device of claim 2, wherein, The humidification device (4) is arranged in communication with the diffusion section (33) through a humidification duct (6).

4. The tunnel ventilation device of claim 1, wherein, The end of the ventilation duct (1) extending out of the tunnel is provided with an air inlet cylinder (7), one end of the air inlet cylinder (7) is fixedly communicated with the ventilation duct (1), and the other end is arranged with the fan (2).

5. The tunnel ventilation device of claim 4, wherein, A support frame (8) is arranged below the air inlet cylinder (7) for supporting the air inlet cylinder (7).

6. The tunnel ventilation device of claim 1, wherein, The expansion section (5) comprises: A corrugated expansion pipe (51) fixedly communicated with the ventilation duct (1) through connecting joints (52) at both ends; A length adjustment structure (53) connected with the connecting joints (52) at both ends for adjusting the distance between the two connecting joints (52) to adjust the expansion degree of the corrugated pipe.

7. The tunnel ventilation device of claim 6, wherein, The length adjustment structure (53) is a screw rod, the screw rod passes through the connecting joints (52) at both ends and is in sliding fit with the connecting joints (52), and nuts (54) are threadedly connected on both sides of each connecting joint (52) on the screw rod to limit the relative position of the connecting joints (52) and the screw rod.

8. The tunnel ventilation device of claim 7, wherein, A sliding adjustment bracket is arranged on the screw rod to ensure the stability of the ventilation duct after the expansion of the corrugated pipe.

9. The tunnel ventilation device of claim 8, wherein, The adjustment bracket comprises: A connecting block (55) sleeved on the screw rod and in sliding fit with the screw rod; A fixed component (56) fixedly connected with the tunnel, and the connecting block (55) is clamped on the bottom of the fixed component (56) and in sliding fit with the fixed component (56).

10. The tunnel ventilation device of claim 9, wherein, Limiting stoppers (57) are arranged at both ends of the fixed component (56) for stopping the connecting block (55).

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