Gas extraction device in tunnel

Abstract

The utility model discloses a device for extracting gas in a tunnel, which belongs to the technical field of tunnel ventilation and comprises a fan and a gas detector arranged at the top of the fan, the concentration of the gas in the tunnel is detected through the gas detector, and the fan automatically and timely extracts the gushing gas, so that the concentration of the gas in the tunnel is detected. The gas emission condition in the tunnel can be known in real time through the draught fan and the gas detector, the situation that the gas concentration in the tunnel is too large and is not known and tunnel excavation personnel are in distress can be avoided, the device is automatically started, operation and detection do not need to be implemented by professionals, detection, gas extraction and ventilation and gas concentration reduction are automatically completed, and the working efficiency is improved. Constructors are simplified, and the construction safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel ventilation technical field, especially a kind of gas extraction device in tunnel. BACKGROUND

[0002] In the tunnel excavation process, whenever uncovering gas-containing coal seam, there will be a large amount of gas continuously gushing into the tunnel, which is an inevitable natural phenomenon, and these gushing gas must be extracted quickly. Since gas is colorless and odorless and not easy to detect, tunnel excavation personnel are difficult to find. If the gas concentration is not reduced below the safety line quickly, poisoning, burning or hypoxia and other major safety accidents may occur in the tunnel.

[0003] Gas is colorless and odorless and needs to be detected by professional personnel using special equipment. During construction, the gas concentration in the tunnel needs to be kept at a low level, and the equipment needs to be frequently detected at the tunnel excavation site. The detection position also needs to follow the tunnel excavation process continuously, which will slow down the construction progress. After detecting that the gas exceeds the standard, the fan needs to be used as soon as possible to extract and disperse the gas inside the tunnel to reduce the concentration as soon as possible. The operation is complicated.

[0004] Professional detection personnel are not good at operating tunnel excavation equipment, that is, two different groups of personnel are needed to be responsible for different work items during tunnel excavation. Tunnel excavation itself is dangerous, and the two groups of workers will interfere with each other, causing obstruction and disturbance to construction.

[0005] Therefore, the utility model designs a gas extraction device in tunnel to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a gas extraction device in tunnel, which can detect the gas concentration in the tunnel and extract the gushing gas in time through the fan. This can avoid the situation that the gas concentration in the tunnel is too high and the personnel are unaware of the situation, leading to the situation that the tunnel excavation personnel are in danger. Moreover, professional personnel are not needed to operate and detect, and the device can complete detection, air extraction and gas concentration reduction automatically, which simplifies the construction personnel and increases the construction safety.

[0007] The utility model is implemented as follows: a gas extraction device in tunnel, comprising:

[0008] A fan, an air inlet pipe, a filter screen and a vibrator are arranged on the top of the fan.

[0009] A gas detector is arranged on the top of the fan.

[0010] The air inlet pipe and the air outlet pipe are funnel-shaped structures with large air inlets and small air outlets, the air outlet of the air inlet pipe is connected to the front end of the fan, and the air inlet of the air outlet pipe is sealingly connected to the air outlet of the fan.

[0011] The filter screen is a flexible steel wire filter screen, the top and bottom of the fan are respectively provided with a winding machine, the two ends of the filter screen are wound on the upper and lower winding machines, and the filter screen is slidingly covered on the air inlet of the fan.

[0012] The vibrator is arranged at the bottom of the fan, and the vibrator is arranged at the front end of the winding machine at the bottom of the fan, and the vibrator is slidingly attached to the filter screen at the front end of the winding machine.

[0013] Further, the air inlets and air outlets of the fan, the air inlet pipe and the air outlet pipe are square sections.

[0014] The air outlet of the air outlet pipe is smaller than the air outlet of the fan.

[0015] The air inlet of the fan is smaller than the air inlet of the air inlet pipe.

[0016] Further, the left and right sides of the air inlet of the fan are provided with sliding grooves, the filter screen is slidingly arranged in the sliding grooves, the sliding grooves are fixedly clamped between the air inlet pipe and the fan, and the filter screen is blocked between the air inlet pipe and the fan.

[0017] The sliding grooves are outside the air inlets of the air inlet pipe and the fan.

[0018] Further, the vibrator is an ultrasonic oscillator.

[0019] Further, the gas detector is a gas detector.

[0020] The beneficial effects of the utility model are as follows: 1. The utility model adds a gas detector on the fan to form an integral structure, can directly associate the gas concentration with the fan, form an overall response strategy for the gas concentration during tunnel excavation, and can normally perform tunnel excavation work only by the device, and no longer needs professional personnel to carry complex equipment and be ready for fan ventilation and evacuation operation.

[0021] 2. The device responds to the construction environment in the tunnel, adds a filter screen, covers between the fan and the air inlet pipe through the filter screen, can isolate the dust during tunnel excavation outside the fan, avoids the impact damage of particulate matters in the air on the fan blades, effectively increases the service life of the fan blades in the tunnel, and enables the fan to normally maintain suction force.

[0022] 3、The device also increases the winding machine, can be forward and backward winding and unfolding of filter screen, and then make for the filter screen to protect the fan, the fan wind power is not affected, but also increases the vibrator, can be vibration of filter screen in the winding process to shake off dust, in the tunnel construction process, the device can automatically clean the filter screen, keep the filter screen in ventilation state. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further described below in combination with the embodiments with reference to the drawings.

[0024] Fig. 1 It is the whole side surface structure schematic diagram of the utility model;

[0025] Fig. 2 It is the fan outlet end structure schematic diagram of the utility model;

[0026] Fig. 3 It is the filter screen and chute assembly structure schematic diagram at the fan inlet end of the utility model.

[0027] In the drawings, the component list represented by each sign is as follows:

[0028] 1-fan, 11-gas detector, 2-air inlet pipe, 21-air outlet pipe, 3-filter screen, 31-winding machine, 32-chute, 4-vibrator. DETAILED DESCRIPTION

[0029] Please refer to Figs. 1 to 3 The utility model provides a kind of gas extraction device in tunnel, to better understand the above technical solution, the above technical solution will be explained in detail in the following with the description of drawing and specific embodiment.

[0030] In one specific embodiment of the technical scheme of the utility model:

[0031] Including fan 1, air inlet pipe 2, filter screen 3 and vibrator 4;

[0032] Fan 1 top is equipped with gas detector 11, and gas detector 11 is gas detector, just can monitor the gas concentration near fan 1 in real time;

[0033] Air inlet pipe 2 and air outlet pipe 21 are all funnel-shaped structure with large air inlet and small air outlet, and the air outlet of air inlet pipe 2 is connected to the front end of fan 1, and the air inlet of air outlet pipe 21 is sealedly connected with the air outlet of fan 1;

[0034] The air inlet and air outlet of fan 1, air inlet pipe 2 and air outlet pipe 21 are all square section;

[0035] The air outlet side length of air outlet pipe 21 is less than the air outlet side length of fan 1;

[0036] The length of the front end of the fan 1 is smaller than the length of the air inlet of the air inlet pipe 2; ensure that the air inlet pipe 2 and the air outlet pipe 21 are large inlets and small outlets, which is convenient for the air flow to be restrained and small, and the fan 1 blows the air to form a jet through the air inlet pipe 2 and the air outlet pipe 21. Because the fan 1 has a fixed fan air flow, the air inlet pipe 2 has a large air inlet opening, and the air outlet pipe 21 has a small air outlet opening, when the flow is constant, the fan 1 forms a faster air outlet speed, and the air outlet pipe 21 has a fast initial speed, thereby transporting the gas with a higher concentration of gas out of the tunnel faster, and the tunnel along the line has a powerful main fan and a jet fan for cooperation. The gas circulation system of the fan is a necessary ventilation system of the tunnel, and the device can transport the gas with gas into the ventilation system faster, so that the gas is extracted from the tunnel faster, and the tunnel excavation is kept in a safe construction environment.

[0037] The filter screen 3 is a flexible steel wire filter screen, and the fan 1 is provided with a winding machine 31 at the top and the bottom. The two ends of the filter screen 3 are wound on the upper and lower winding machines 31, and the filter screen 3 is slidably covered on the air inlet of the fan 1. The air inlet of the fan 1 is isolated from the outside through the filter screen 3;

[0038] The left and right sides of the air inlet of the fan 1 are provided with sliding grooves 32, the filter screen 3 is slidably arranged in the sliding grooves 32, and the sliding grooves 32 are fixedly clamped between the air inlet pipe 2 and the fan 1. The filter screen 3 is blocked between the air inlet pipe 2 and the fan 1;

[0039] The sliding grooves 32 are outside the ventilation pipe opening of the air inlet pipe 2 and the fan 1, and do not block the ventilation pipe opening

[0040] The vibrator 4 is an ultrasonic oscillator, and the vibrator 4 is arranged at the bottom of the fan 1. A vibrator 4 can also be arranged at the top of the fan 1, which can more thoroughly clean the filter screen 3.

[0041] The vibrator 4 is arranged at the front end of the winding machine 31 at the bottom of the fan 1, and the vibrator 4 is slidably attached to the filter screen 3 at the front end of the winding machine 31.

[0042] The fan 1, the winding machine 31, the vibrator 4 and the gas detector 11 are connected with the same controller, which is a single-chip microcomputer.

[0043] An audible and visual alarm can also be arranged on the fan 1, and the audible and visual alarm also needs to be connected with the equipment controller for control. When the gas concentration exceeds the standard, a prompt can be given. If the alarm prompt time lasts for a long time, it means that the gas concentration is excessive, and personnel need to evacuate in time and professional personnel need to handle.

[0044] It should be noted that:

[0045] 1. A large amount of dust will be generated during the tunnel excavation process, and the dust particles will collide with the fan blades 1. This working environment can easily cause damage to the fan 1. The device adds a filter 3, but the aperture of the filter 3 is too large to achieve the filtering effect, and the mesh is too small to easily clog. During construction, the filtering effect is still the main requirement, so the filter 3 is easily clogged, which is a new problem. The device uses two winders 31 to replace the covering position of the filter 3 on the air inlet of the fan 1, so that the filter 3 can maintain an unobstructed position to block and protect the fan 1. The tunnel itself has a good ventilation system. The device is specially designed for the gas that suddenly gushes out during the excavation process, which needs to be extracted in time. The device is specially used in this scenario, which is a supplement to the tunnel's own ventilation system and can handle the sudden gas more closely and in a timely manner.

[0046] 2. In a dusty environment, the filter 3 is also easy to be clogged, especially the water mist for dust reduction will increase the viscosity of dust particles, making it easier to clog the filter 3. The present device adds a vibrator 4, which can vibrate the filter 3 when it is wound by the winder 31, so as to facilitate the separation of clogged particles. If the particles are wet, they will easily agglomerate into larger particles during vibration. The winder 31 will dry them over time after winding them up. The vibrator 4 will vibrate at high frequency during the process of winding the filter 3 up or down, and vibration dust removal will be performed during the reciprocating winding process. Whether it is dry or wet particles, the present device will vibrate. When the filter 3 is wound on the winder 31, it will slowly dry. All wet particles will eventually become dry on the filter 3 and will separate from the filter 3 after vibration. The present device can clean the filter 3 by itself, making it more convenient to use.

[0047] 3. The filter screen 3 of this device is a flexible steel wire mesh, which can be easily rolled up and unrolled between the upper and lower winders 31. It can be easily cleaned and replaced. When the filter screen 3 is blocked and cannot be used, the filter screen 3 rolled up on the winder 31 can be directly replaced. The operation is also simple.

[0048] When the utility model is in use, the device is placed at a position close to the front of the tunnel excavation, and the equipment is kept in a safe construction environment.

[0049] Then start the device and connect it to the power supply of the equipment. Generally, the equipment inside the tunnel is equipped with a generator set. Then, the air outlet pipe 21 of the device is directed to the ventilation circulation system inside the tunnel. The gas detector 11 of the device is started to detect. When it is detected that the gas concentration exceeds the standard, the fan 1 starts automatically and starts to suck and inflate. After a certain period of time, the winder 31 starts and starts to wind the filter 3. The winders 31 at the upper and lower ends operate in opposite directions. The winder at the top winds up and the winder 31 at the bottom unfolds. Conversely, when the winder 31 at the top starts to wind up, the winder at the bottom stretches out.

[0050] Meanwhile, the vibrator 4 is started synchronously when the winding machine 31 is running, and keeps vibrating the filter screen 3 to shake off the particles adhered to the filter screen 3, and when the particles are relatively wet, most of the particles can be shaken off, and only a small amount of particles can be adhered to the filter screen 3, and after the filter screen 3 covering the inlet pipe 2 is replaced, the filter screen 3 becomes clean, and the wound filter screen 3 can be dried slowly. When the filter screen 3 needs to be wound and spread again, the vibrator 4 is started synchronously again to shake off the particles dried on the filter screen 3, because only water mist and dust can be generated in the tunnel, and no other gluey substances can be generated, and only the dust needs to be shaken off and dried, and the particles can be shaken off easily by ultrasonic vibration. When the filter screen 3 cannot be vibrated and cleaned, water flushing can be performed, and the filter screen 3 can be replaced by the winding machine 31, and the use is convenient.

[0051] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific embodiments described are only illustrative, and are not intended to limit the scope of the present application, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. A gas extraction device in a tunnel, characterized in that, The utility model relates to a kind of air filter, including: Fan (1), air inlet pipe (2), filter screen (3) and vibrator (4); The fan (1) top is equipped with gas detector (11); The air inlet pipe (2) and air outlet pipe (21) are funnel structure that air inlet is large and air outlet is small, the air inlet pipe (2) air outlet is butt joint in the front end of fan (1), and the air inlet of air outlet pipe (21) is sealed butt joint on the air outlet of fan (1); The filter screen (3) is flexible steel wire filter screen, and the top and bottom of fan (1) is equipped with one winding machine (31), both ends of filter screen (3) are wound on the upper and lower winding machines (31), and filter screen (3) is slidably covered on the air inlet of fan (1), and the air inlet of fan (1) is isolated from outside by filter screen (3); The vibrator (4) is arranged at the bottom of fan (1), and the vibrator (4) is arranged at the front end of winding machine (31) at the bottom of fan (1), and the vibrator (4) is slidably attached to the filter screen (3) at the front end of winding machine (31).

2. A gas extraction device within a tunnel according to claim 1, characterised in that: The air inlet and air outlet of fan (1), air inlet pipe (2) and air outlet pipe (21) are square section; The air outlet side length of air outlet pipe (21) is less than the air outlet side length of fan (1); The side length of the air inlet of fan (1) is less than the air inlet side length of air inlet pipe (2).

3. A gas extraction device within a tunnel according to claim 1, characterized in that: The left and right sides of the air inlet of fan (1) are provided with sliding groove (32), and filter screen (3) is slidably arranged in sliding groove (32), and sliding groove (32) is fixedly clamped between air inlet pipe (2) and fan (1), and filter screen (3) is blocked between air inlet pipe (2) and fan (1); The sliding groove (32) is outside the ventilation pipe port of air inlet pipe (2) and fan (1).

4. A gas extraction device within a tunnel according to claim 1, characterized in that: The vibrator (4) is ultrasonic oscillator.

5. A gas extraction device in a tunnel according to claim 1, characterized in that: The gas detector (11) is gas detector.

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