Gas tunnel multi-group parallel ventilation system

Abstract

The utility model belongs to the technical field of tunnel ventilation, and aims to solve the problems that due to the influence of tunnel excavation sections and various construction racks, the space is limited and the material input is multiplied when two paths of independent air ducts are adopted in a gas tunnel. The multi-group parallel ventilation system for the gas tunnel comprises a standby ventilation unit and at least two main ventilation units, the standby ventilation unit comprises a standby fan and at least two standby air ducts, the standby air ducts are connected with the air outlet end of the standby fan, and the different standby air ducts are mutually independent; each main ventilation unit comprises a main fan and a main air duct connected to the air outlet end of the main fan, the different main ventilation units are mutually independent, and any main air duct communicates with a unique corresponding standby air duct; and the connecting part of the main air duct and the standby air duct is of an air return prevention structure. The system is simple in structure, and through the parallel ventilation structure, the standby fan can be immediately started to achieve ventilation in the tunnel after the main fan stops blowing due to maintenance, faults and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel ventilation, and particularly relates to a multi-group parallel ventilation system for gas tunnels. Background Technique

[0002] Construction ventilation is a very important process in tunnel engineering construction. For long tunnels, different ventilation schemes need to be adopted in each stage according to the project progress. Generally speaking, when the construction length is within 1500 meters, the single-heading forced ventilation can be adopted, and the forced ventilator is set at the tunnel entrance; when it exceeds 1500 meters, the roadway ventilation method is preferably adopted, and the ventilator needs to be moved to a position within 750 meters from the excavation face in the tunnel. For gas tunnels, continuous ventilation for 24 hours is required, and the ventilators must be "one in use and one standby". The standby ventilator should be able to start immediately after the main ventilator stops due to maintenance, failure and other reasons.

[0003] Due to the influence of the tunnel excavation section and various construction gantries, using two independent air ducts in the gas tunnel not only limits the space, but also doubles the material input. Content of the Utility Model

[0004] The utility model provides a multi-group parallel ventilation system for gas tunnels in order to solve at least one of the above technical problems existing in the prior art.

[0005] The utility model is realized by adopting the following technical scheme: a multi-group parallel ventilation system for gas tunnels includes a standby ventilation unit and at least two main ventilation units;

[0006] The standby ventilation unit includes a standby fan and at least two standby air ducts. The standby air ducts are connected to the air outlet end of the standby fan and are independent of each other;

[0007] Each main ventilation unit includes a main fan and a main air duct connected to the air outlet end of the main fan. Different main ventilation units are independent of each other. Each main air duct is communicated with a uniquely corresponding standby air duct; and the connection part between the main air duct and the standby air duct is an anti-backflow structure.

[0008] Preferably, the anti-backflow structure includes an external extension section and an internal extension section of the standby air duct extending into the main air duct. The external extension section is hermetically fixed by fitting with the inner wall of the main air duct on the side close to the standby air duct, and the internal extension section is movably arranged and can fit and cover the air outlet channel of the standby air duct or the air outlet channel of the main air duct under the action of wind force.

[0009] Preferably, the materials of the main air duct and the standby air duct are knife-scraped joint cloth. The external extension section is sewn and sealed with the side wall of the main air duct, and the extension distance of the standby air duct extending into the main air duct is 10m.

[0010] Preferably, at least two spare air ducts are connected to the spare fan through an air duct conversion device. The air duct conversion device has parallel channels corresponding to the number of spare air ducts, and valves for controlling their on / off are provided at the parallel channels.

[0011] Preferably, the air duct conversion device is in the shape of trousers, and the number of corresponding spare air ducts and main ventilation units is 2.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The structure of this system is simple. Through the parallel ventilation structure, the air duct can be quickly switched. After the main fan stops blowing due to maintenance, failure or other reasons, the spare fan can be immediately started to realize ventilation in the tunnel. Fully combining the characteristics of tunnel construction, on the premise of ensuring continuous air supply in the tunnel, equipment and materials can be saved, and the construction ventilation cost can be reduced.

[0014] Moreover, the connection between the spare air duct and the main air duct in this system adopts an anti-backflow structure, which can avoid the occurrence of backflow and air leakage phenomena and realize continuous air supply in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is the overall structure schematic diagram of this embodiment;

[0017] Figure 2 is the structure schematic diagram of the air duct conversion device of this embodiment;

[0018] Figure 3 is the schematic diagram of the anti-backflow structure when the main air duct is blowing air in this embodiment;

[0019] Figure 4 is the schematic diagram of the anti-backflow structure when the spare air duct starts to blow air in this embodiment;

[0020] Figure 5 is the schematic diagram of the anti-backflow structure during the air supply process of the spare air duct in this embodiment;

[0021] Figure 6 is the schematic diagram of the anti-backflow structure when the spare air duct is fully blowing air in this embodiment.

[0022] In the figure: 1.1 - main blower; 1.2 - main air duct; 2.1 - standby blower; 2.2 - standby air duct; 3.1 - external extension section; 3.2 - internal extension section; 4 - air duct conversion device. Specific implementation mode

[0023] Combined with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0024] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should fall within the scope covered by the technical content disclosed in the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0025] The present invention provides an embodiment:

[0026] As Figure 1 shown, a multi-group parallel ventilation system for a gas tunnel includes a standby ventilation unit and at least two main ventilation units; the standby ventilation unit includes a standby blower 2.1 and at least two standby air ducts 2.2. The standby air ducts 2.2 are connected to the air outlet end of the standby blower 2.1 and are independent of each other among different standby air ducts 2.2; the main ventilation unit includes a main blower 1.1 and a main air duct 1.2 connected to the air outlet end of the main blower 1.1. Different main ventilation units are independent of each other, and a unique corresponding standby air duct 2.2 is communicated with any main air duct 1.2; and the connection part between the main air duct 1.2 and the standby air duct 2.2 is an anti-backflow structure.

[0027] In this embodiment, the anti-backflow structure includes an external extension section 3.1 and an internal extension section 3.2 of the standby air duct 2.2 extending into the main air duct 1.2. The external extension section 3.1 is hermetically fixed by fitting and adhering to the inner wall of the main air duct 1.2 on the side close to the standby air duct 2.2. The internal extension section 3.2 is movably arranged and can fit and cover the air outlet passage of the standby air duct 2.2 or the air outlet passage of the main air duct 1.2 under the action of wind force. The materials of the main air duct 1.2 and the standby air duct 2.2 are knife-scraped joint cloth, which is an enhanced cloth base. The selected diameter of the air duct is matched with the ventilator. The external extension section 3.1 is sewn and sealed with the side wall of the main air duct 1.2, and the internal extension section 3.2 is not sewn. The extension distance of the standby air duct 2.2 extending into the main air duct 1.2 is 10m.

[0028] As Figures 3 to 6 shown, after the main fan 1.1 supplies air, the main air duct 1.2 directly connected to the fan quickly expands to a full state. Due to the air flow extrusion, the extension section of the standby air duct 2.2 naturally fits together and closely adheres to one side inside the main air duct, so that the air flow advances along the established path. At the same time, since the standby air duct is squeezed and naturally adheres tightly without air leakage, the phenomenon of the main air duct 1.2 backflowing and cross-flowing into the standby air duct 2.2 is avoided. When the main fan 1.1 is deactivated and the standby fan 2.1 is activated, the standby air duct 2.2 expands to a full state due to the air flow and supplies air forward. The natural extension section of the standby air duct 2.2 inside the main air duct 1.2 fully adheres to the inside of the main air duct due to the air flow expansion, avoiding the phenomenon of the standby air duct 2.2 backflowing and cross-flowing into the main air duct 1.2.

[0029] At least two standby air ducts 2.2 are connected to the standby fan 2.1 through the air duct conversion device 4. The air duct conversion device 4 has parallel channels corresponding to the number of standby air ducts 2.2, and valves for controlling their on-off are provided at the parallel channels. As Figure 2 shown, the air duct conversion device 4 is in the shape of trousers, and the corresponding number of standby air ducts 2.2 and the main ventilation unit is 2. The air duct conversion device 4 is composed of a welded combination of a ventilation butterfly valve and a metal air duct. The ventilation butterfly valve adopts the structural form of a center-line type butterfly plate, and can be selected manually or installed with a pneumatic control and adjustment device according to needs. The metal air duct is welded by a stainless steel galvanized steel cylinder. This trouser-shaped air duct conversion device has a compact structure, light weight, and small air resistance. When the standby fan is not activated, the ventilation butterfly valve is closed to prevent air leakage and air duct series connection. When the air duct needs to be activated, the corresponding ventilation butterfly valve is opened to release the air duct section and provide a ventilation path.

[0030] Specific working principle:

[0031] The No. 1 main fan, the No. 2 main fan and the standby fan 2.1 are arranged at a position 15 - 25m outside the tunnel. The No. 1 and No. 2 main air ducts enter the two main tunnels respectively and are installed and suspended on one side wall of the tunnel until the air outlet end of the air duct is within 10m of the heading face to supply air for the heading face construction.

[0032] When the main blower 1.1 is in a normal state, start the No. 1 and No. 2 main blowers. The main air duct 1.2 directly connected to the blowers quickly expands to a full state. Due to the air flow extrusion, the extension section of the standby air duct 2.2 naturally fits together and closely adheres to one side inside the main air duct 1.2, so that the air flow advances along the established path. At the same time, since the standby air duct 2.2 is squeezed and naturally fits closely, there is no air leakage as Figure 3 shown, avoiding the phenomenon that the main air duct returns air and cross-ventilates to the standby air duct.

[0033] When the No. 1 main blower is out of service due to a fault or maintenance, open the No. 1 ventilation butterfly valve and close the No. 2 ventilation butterfly valve, and immediately start the standby blower 2.1. The standby air duct expands to a full state due to the rapid air flow and supplies air to the No. 1 standby air duct. The natural extension section of the No. 1 standby air duct inside the No. 1 main air duct fully adheres to the inside of the No. 1 main air duct due to the air flow expansion as Figures 4 - 6 shown, avoiding the phenomenon that the No. 1 standby air duct returns air and cross-ventilates to the No. 1 main air duct.

[0034] Similarly, when the No. 2 main blower is out of service due to a fault or maintenance, open the No. 2 ventilation butterfly valve and close the No. 1 ventilation butterfly valve, and immediately start the standby blower. The standby air duct expands to a full state due to the rapid air flow and supplies air to the No. 2 standby air duct. The natural extension section of the No. 2 standby air duct inside the No. 2 main air duct fully adheres to the inside of the main air duct due to the air flow expansion, avoiding the phenomenon that the No. 2 standby air duct returns air and cross-ventilates to the No. 2 main air duct, realizing continuous air supply in the tunnel and ensuring safe construction.

[0035] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A multi-group parallel ventilation system for a gas tunnel, characterized by: including a backup ventilation unit and at least two main ventilation units; The standby ventilation unit comprises a standby fan (2.1) and at least two standby air ducts (2.2), wherein the standby air ducts (2.2) are connected to the air outlet end of the standby fan (2.1) and different standby air ducts (2.2) are independent of each other; The main ventilation unit comprises a main fan (1.1) and a main air duct (1.2) connected to the air outlet end of the main fan (1.1); different main ventilation units are independent of each other; any main air duct (1.2) is connected to a unique corresponding backup air duct (2.2); and the connection between the main air duct (1.2) and the backup air duct (2.2) is a backflow prevention structure.

2. A multi-group parallel ventilation system for a gas tunnel according to claim 1, characterized in that: The anti-return air structure comprises an external extension section (3.1) and an internal extension section (3.2) of a spare air duct (2.2) extending into a main air duct (1.2), wherein the external extension section (3.1) and the main air duct (1.2) are closely attached to and sealed against an inner wall of one side of the spare air duct (2.2), and the internal extension section (3.2) is movably arranged and can be attached to and cover an air outlet passage of the spare air duct (2.2) or an air outlet passage of the main air duct (1.2) under the action of wind.

3. A multi-group parallel ventilation system for a gas tunnel according to claim 2, characterized in that: The main air duct (1.2) and the spare air duct (2.2) are made of knife-scraped joint fabric, the external extension section (3.1) is sewed and sealed with the side wall of the main air duct (1.2), and the extension distance of the spare air duct (2.2) extending into the main air duct (1.2) is 10m.

4. A multi-group parallel ventilation system for a gas tunnel according to claim 1, characterized in that: At least two spare air ducts (2.2) are connected to the spare fan (2.1) via an air duct conversion device (4); the air duct conversion device (4) is provided with parallel channels corresponding to the number of the spare air ducts (2.2); and valves for controlling the on-off of the parallel channels are provided at the parallel channels.

5. A multi-group parallel ventilation system for a gas tunnel according to claim 4, characterized in that: The air duct conversion device (4) is in the shape of pants, and the number of the corresponding spare air duct (2.2) and main ventilation unit is two.

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