CN115680740A - Method for improving ventilation of extra-long tunnel - Google Patents
Method for improving ventilation of extra-long tunnel Download PDFInfo
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- CN115680740A CN115680740A CN202211308112.4A CN202211308112A CN115680740A CN 115680740 A CN115680740 A CN 115680740A CN 202211308112 A CN202211308112 A CN 202211308112A CN 115680740 A CN115680740 A CN 115680740A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 34
- 210000001503 joint Anatomy 0.000 claims description 69
- 238000000605 extraction Methods 0.000 claims description 44
- 230000008569 process Effects 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 4
- 238000003032 molecular docking Methods 0.000 claims 7
- 239000000284 extract Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 12
- 239000002912 waste gas Substances 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 31
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- 238000005265 energy consumption Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
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- 238000010521 absorption reaction Methods 0.000 description 1
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Abstract
The invention discloses a method for improving ventilation of an extra-long tunnel, which relates to the technical field of tunnel construction, and comprises the steps of S1 reserved hole opening, S2 component fixing assembly, S3 intermittent ventilation, S4 high-power ventilation and S5 waste gas exhaust.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a method for improving ventilation of an extra-long tunnel.
Background
Along with the development of railway construction, the quantity of long tunnels and extra-long tunnels is gradually increased, the ventilation of the long tunnels and the extra-long tunnels in the construction process also becomes a critical difficult problem, the ventilation distance of conventional press-in ventilation and roadway ventilation is long, the air quantity and the air speed loss are large, and the requirements of the long tunnels are difficult to meet, so that the shaft type ventilation of getting through the tunnel roof and the mountain is adopted in the long tunnels nowadays to become the main mode of the extra-long tunnels.
As in application No.: 201811097079.9, a ventilation method for high-gas extra-long tunnel construction, which comprises the steps of ventilating in two stages according to the construction progress; the first stage is as follows: before the ventilation shaft is communicated, the working areas of the inlet and the outlet at the two ends of the tunnel and the working area of the inclined shaft in the middle of the tunnel adopt a press-in ventilation mode; in the second stage, after the ventilation vertical shaft is communicated, the ventilation modes of the entrance and exit work areas at two ends of the tunnel are unchanged, and a jet fan is additionally arranged in the hole according to the construction progress to strengthen return air; the inclined shaft work area in the middle of the tunnel adopts an innovative ventilation mode of self-shaft suction type ventilation and self-inclined shaft exhaust, and a jet fan is additionally arranged in the tunnel according to the construction progress of working faces at two ends of the inclined shaft work area, so that dirty air is continuously exhausted from the inclined shaft through the jet fan. According to the invention, through reasonable matching of two ventilation modes in different stages and different work areas, the ventilation effect is improved, and the construction cost can be greatly reduced. Simultaneously, the personal safety of constructors is ensured by arranging a wind power locking system and a tile power locking system.
The method for ventilating the extra-long tunnel similar to the above application has the following defects at present:
the existing shaft ventilation pipeline needs to be matched with a large number of branch-trunk type branch pipelines at the outer end of the shaft ventilation pipeline to effectively ventilate, but the difficulty of the branch-trunk type pipeline in the shaft is integrally high, and the shaft with a large diameter needs to be dug to be effectively buried, so that the influence on the structural stability of the tunnel is caused, in addition, the ventilation range of the ventilation method of the current extra-long tunnel is small, the number of shafts dug in the extra-long tunnel can be increased, and the ventilation cost can be further increased.
In view of the above, a method for improving ventilation of an extra-long tunnel is proposed by improving the existing structure and defects.
Disclosure of Invention
The present invention aims to provide a method for improving ventilation of an extra-long tunnel, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for improving ventilation of an extra-long tunnel comprises the following steps:
s1, opening reserved holes:
a vertical shaft reaching the top of the tunnel is arranged outside the mountain, and a placement groove is arranged on the inner side of the top of the tunnel;
s2, fixing and assembling parts:
inserting an access pipe into the vertical shaft, exposing the top end of the access pipe outside a mountain, extending the tail end of the access pipe into the placement groove, fixing a motor on the inner wall of the placement groove, aligning butt-joint seats at the two outer ends of the air exhaust box with the tail end of the access pipe and butting the butt-joint pipe for butting, after the operations are completed, fixing a support plate and the inner wall of the bottom end of the placement groove, completing the butting of the air exhaust box and the access pipe, fixing a gas collection box at the bottom end of the support plate, completing the butting of the gas collection box and the butt-joint pipe, inserting ventilation pipes into the two outer ends of the gas collection box, and fixing the ventilation pipes and the top of the tunnel;
s3, intermittent ventilation:
the air inlet fan works to blow air outside the tunnel into the interior of the access pipe, the air extraction box works at the same time, the air inside the air collection box is evacuated through the butt joint pipe, so that the air collection box is vacuumized, after the air inside the air collection box is exhausted, the air extraction box stops working, the access pipe is communicated with the butt joint pipe, a valve outside the butt joint pipe is opened at the moment, the air inside the access pipe can flow into the air collection box due to air pressure difference, then the valve outside the ventilation pipe is opened, and fresh air inside the air collection box can enter the ventilation pipe and enter the tunnel through the air outlet;
s4, high-power ventilation is carried out;
the motor drives the air extraction box to rotate, so that the positions of two suction ports of the air extraction box are exchanged, the air inlet fan works to blow air outside the tunnel into the inlet pipe, the air extraction box works at the moment, the air in the inlet pipe can be sent into the air collection box through the butt joint pipe, and then the fresh air is sent into the tunnel through the air outlet by the ventilation pipe;
s5, discharging waste gas:
the motor drives the air exhaust box to rotate, the air exhaust opening of the air exhaust box faces the butt joint pipe, meanwhile, the air exhaust box enables the butt joint pipe to be communicated with the exhaust pipe, the air exhaust box works, waste gas in the tunnel can be sucked into the ventilation pipe through the air outlet and enters the butt joint pipe through the gas collecting box, and then the waste gas can be discharged into the ventilation pipe through the exhaust pipe and is discharged from the air outlet.
And in the step S1, the opened vertical shaft is communicated with the placing groove.
And S2, in the process of connecting the butt joint seat with the inlet pipe and the butt joint pipe, the electric push rod works to drive the extension pipe to move in the fixed pipe, so that the butt joint seat extends and is connected with the inlet pipe and the butt joint pipe in a butt joint mode.
In the step S2, the motor and the air extraction box are integrated, and the motor is fixed on the inner wall of the placement groove through the locking bolt.
And in the step S3, when the air collecting box is exhausted by the air exhaust box, the valve outside the ventilation pipe is in a closed state.
And in the step S3, valves outside the ventilation pipes of all sites at the outer end of the gas collection box are intermittently opened and closed in sequence in the process that the gas collection box ventilates the ventilation pipes.
And S4, before the motor drives the air exhaust box to rotate, the electric push rod works to drive the extension pipe to move in the fixed pipe, so that the butt joint seat is separated from the inlet pipe and the butt joint pipe.
And S4, when the gas collection box supplies air to the ventilation pipes at all the sites, all valves outside the ventilation pipes are in an open state.
In the step S4, when the air exhaust box rotates, the bearing rotating seat can offset the torque when the air exhaust box rotates through rotation, so that the air exhaust pipe is always located at a fixing position.
In the step S5, the inlet pipe is divided into a left independent space and a right independent space by the partition board, air is introduced into the left end of the inlet pipe, and air is exhausted from the right end of the inlet pipe.
The invention provides a method for improving ventilation of an extra-long tunnel, which has the following beneficial effects:
1. the air inlet fan works to blow air outside the tunnel into the inlet pipe, the air exhaust box works simultaneously, the air inside the air collection box is evacuated through the butt joint pipe, the air collection box is vacuumized, after the air inside the air collection box is exhausted, the air exhaust box stops working, the inlet pipe is communicated with the butt joint pipe, a valve outside the butt joint pipe is opened at the moment, the air inside the inlet pipe can flow into the air collection box due to air pressure difference, then the valve outside the ventilation pipe is opened, fresh air inside the air collection box can enter the ventilation pipe and enters the tunnel through the air outlet, intermittent ventilation can be achieved, the workload in the tunnel is low, the ventilation device does not need to be used when a large amount of ventilation is achieved, the energy consumption of the ventilation device during use can be greatly reduced, in addition, the air flowing inside the inlet pipe is accelerated through the siphoning effect after the air collection box is opened in vacuum, and the inflow amount of the outside air during the intermittent ventilation can be effectively guaranteed.
2. In the process that the air collection box ventilates the ventilation pipes, valves outside the ventilation pipes at all points at the outer end of the air collection box are intermittently opened and closed in sequence, so that the air collection box only injects air into a single ventilation pipe at a single time, the lengths of all the ventilation pipes at the outer end of the air collection box are different, and the air outlet points arranged on the surface of each ventilation pipe are also different, so that the ventilation pipes can spread the air into a space in a far range in a tunnel by taking the air collection box as the center, the air spreading range can be effectively expanded, in addition, only a single ventilation pipe is injected with air at one time, and the air pressure can be effectively guaranteed to spread the air to a far position.
3. The electric push rod works to drive the extension pipe to move in the fixed pipe, so that the butt joint seat is separated from the access pipe and the butt joint pipe, the motor drives the air extraction box to rotate at the moment, the positions of two suction ports of the air extraction box are changed, the air inlet fan works to blow air outside the tunnel into the access pipe, the air extraction box works at the moment, the air in the access pipe can be sent into the air collection box through the butt joint pipe, then the ventilation pipe sends fresh air into the tunnel through the air outlet, and sufficient ventilation quantity can be ensured when the tunnel is busy to work by adopting high-power air extraction of the air extraction box.
4. The motor drives the air extraction box to rotate, so that the position of an air extraction opening of the air extraction box faces the butt joint pipe, the air extraction box enables the butt joint pipe to be communicated with the exhaust pipe, the air extraction box works, waste gas in the tunnel can be sucked into the ventilation pipe through the air outlet and enters the butt joint pipe through the gas collection box, the waste gas can be discharged into the inlet pipe through the exhaust pipe and is discharged from the exhaust opening, and therefore when a large amount of harmful gas is released in tunnel construction, the ventilation device can effectively absorb and discharge the harmful gas, and the large ventilation range of the ventilation device is benefited, and the suction range of the harmful gas is expanded.
5. The invention carries out multi-type ventilation and exhaust by adopting the change of the suction points of the air extraction box, can lead the inlet pipe to carry out auxiliary ventilation without arranging branch-shaped auxiliary pipes, thus effectively improving the cost and the convenience of the inlet pipe embedded in the shaft, and in addition, the inlet pipe is divided into a left independent space and a right independent space by the partition board, the air at the left end is ventilated, the air at the right end is exhausted, thus leading the exhaust device to use a single inlet pipe in the process of carrying out harmful exhaust emission.
Drawings
Fig. 1 is a schematic front view of an overall structure of a ventilation method for an extra-long tunnel;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is a longitudinal sectional view of the vent pipe;
fig. 4 is a schematic view of the gas collection box in bottom view.
Detailed Description
Referring to fig. 1-4, the present invention provides the following technical solutions: a method for improving ventilation of an extra-long tunnel comprises the following steps:
s1, reserving holes:
a vertical shaft reaching the top of the tunnel is arranged outside the mountain, and a placement groove communicated with the vertical shaft is arranged on the inner side of the top of the tunnel.
S2, fixing and assembling parts:
inserting the access pipe into the vertical shaft to expose the top end of the access pipe outside the mountain, extending the tail end of the access pipe into the placement groove, fixing the motor on the inner wall of the placement groove by using a fixing bolt, aligning the butt joints at the two ends outside the exhaust box with the access pipe and the butt joints respectively, driving the extension pipe to move in the fixing pipe by using an electric push rod to extend the butt joints and complete butt joint with the access pipe and the butt joints, fixing the support plate and the inner wall of the bottom end of the placement groove after the completion of the above operations, completing butt joint of the exhaust box and the access pipe, fixing the gas collecting box at the bottom end of the support plate, completing butt joint of the gas collecting box and the butt joints, inserting the ventilation pipe into the two ends outside the gas collecting box, and fixing the ventilation pipe and the top of the tunnel channel.
S3, intermittent ventilation:
the air inlet fan works to blow air outside the tunnel into the inlet pipe, the air exhaust box works simultaneously, the air inside the air collection box is evacuated through the butt joint pipe, the air collection box is made to be vacuum, after the air inside the air collection box is exhausted, the air exhaust box stops working, the inlet pipe is communicated with the butt joint pipe, a valve outside the butt joint pipe is opened at the moment, the air inside the inlet pipe can flow into the air collection box due to air pressure difference, a valve outside the ventilation pipe is opened, fresh air inside the air collection box can enter the ventilation pipe and enters the tunnel through an air outlet, the intermittent ventilation can be used in the tunnel with less workload, the ventilation device can be greatly reduced in energy consumption when the ventilation device is used, in addition, the air circulation inside the inlet pipe is accelerated by the siphon effect after the air collection box is opened in vacuum, the inflow amount of the external air during intermittent ventilation can be effectively ensured, in the process that the air collection box ventilates to the ventilation pipe, the valves outside the ventilation pipe at all the sites outside the air collection box can be opened and opened in an intermittent manner, the single air injection box can only inject air into a single outer end, the air outlet box is all the ventilation pipe, the ventilation pipe is long, the air pressure of the air collection box can be effectively expanded, the air can be expanded, and the air can be further effectively expanded, the air injection range of the air can be effectively expanded, and the air injection range of the air injection center of the air injection tunnel.
S4, high-power ventilation is carried out;
electric push rod work drives the extension pipe at fixed intraductal displacement, make butt joint seat and let in the pipe, the butt joint pipe separation, the motor drives the exhaust chamber this moment and rotates, the position that makes two mouths of suction of exhaust chamber is exchanged, income fan work, blow in the inside to letting in the pipe with the outer air in tunnel, the work of exhaust chamber this moment, can send into intraductal air to the gas collecting box through the butt joint pipe, in the fresh air passes through the air outlet with the ventilation pipe afterwards and sends into the tunnel, bleed through adopting the exhaust chamber high power, can guarantee the busy work sufficient ventilation volume occasionally in the tunnel.
S5, exhaust gas emission:
the motor drives the extraction box to rotate, the extraction opening position of the extraction box faces towards the butt joint pipe, meanwhile, the extraction box enables the butt joint pipe to be communicated with the exhaust pipe, the extraction box works, waste gas in the tunnel can be sucked into the ventilation pipe through the air outlet and enters the butt joint pipe through the gas collecting box, then the waste gas can be discharged into the access pipe through the exhaust pipe and is discharged from the air outlet, when a large amount of harmful gas is released in tunnel construction, the ventilation device can effectively absorb and discharge the harmful gas, the ventilation device can benefit from the large ventilation range of the ventilation device, the absorption range of the harmful gas is enlarged, various ventilation and exhaust are carried out through the change of suction points of the extraction box, the access pipe does not need to be provided with branch-shaped auxiliary pipes to carry out auxiliary ventilation, the cost and the convenience of the access pipe buried in the shaft can be effectively improved, the access pipe is divided into two left and right independent spaces by the partition plate, the left end air ventilation and right end space exhaust are realized by using a single access pipe in the process of carrying out harmful exhaust emission.
In conclusion, when the method for improving the ventilation of the extra-long tunnel is used, a vertical shaft reaching the top of the tunnel is firstly arranged outside the mountain body, and a placing groove communicated with the vertical shaft is arranged on the inner side of the top of the tunnel;
then inserting the access pipe into the vertical shaft to expose the top end of the access pipe outside the mountain, extending the tail end of the access pipe into the placement groove, fixing the motor on the inner wall of the placement groove by using a fixing bolt, aligning the butt joints at the two ends outside the air extraction box with the access pipe and the butt joints respectively, driving the extension pipe to move in the fixing pipe by the electric push rod, extending the butt joints and completing the butt joint with the access pipe and the butt joints, fixing the support plate and the inner wall of the bottom end of the placement groove after completing the above operations, completing the butt joint of the air extraction box and the access pipe, fixing the air collection box at the bottom end of the support plate, completing the butt joint of the air collection box and the butt joints, inserting the ventilation pipe into the two ends outside the air collection box, and fixing the ventilation pipe and the top of the tunnel channel;
the air inlet fan works to blow air outside the tunnel into the interior of the inlet pipe, the air exhaust box works at the same time, the air inside the air collecting box is evacuated through the butt joint pipe, the air collecting box is made to be vacuum, after the air inside the air collecting box is exhausted, the air exhaust box stops working, the inlet pipe is communicated with the butt joint pipe, at the moment, a valve outside the butt joint pipe is opened, the air inside the inlet pipe can flow into the air collecting box due to air pressure difference, then the valve outside the ventilation pipe is opened, fresh air inside the air collecting box can enter the ventilation pipe and enter the tunnel through the air outlet, the intermittent ventilation can be carried out in the tunnel with less workload, the ventilation is not needed in large quantity, the energy consumption of the ventilation device during use can be greatly reduced, in addition, the siphon effect after the air collecting box is opened in vacuum is adopted to accelerate the air circulation inside the inlet pipe, and the inflow amount of external air during the intermittent ventilation can be effectively ensured;
then, in the process that the gas collection box ventilates the ventilation pipes, valves outside the ventilation pipes at all points at the outer end of the gas collection box are intermittently opened and closed in sequence, so that the gas collection box only injects air into a single ventilation pipe at a single time, the lengths of the ventilation pipes at the outer end of the gas collection box are different, and air outlet points arranged on the surface of each ventilation pipe are also different, so that the ventilation pipes can transmit the air to a space in a far range in a tunnel by taking the gas collection box as a center, the air distribution range can be effectively expanded, and in addition, the air is injected into only a single ventilation pipe at one time, and the air pressure can be effectively ensured to be transmitted to a far position;
then the electric push rod works to drive the extension pipe to move in the fixed pipe, so that the butt joint seat is separated from the access pipe and the butt joint pipe, the motor drives the air extraction box to rotate at the moment, the positions of two suction ports of the air extraction box are exchanged, the air inlet fan works to blow air outside the tunnel into the access pipe, the air extraction box works at the moment, the air in the access pipe can be sent into the air collection box through the butt joint pipe, then the ventilation pipe sends fresh air into the tunnel through the air outlet, and sufficient ventilation quantity can be ensured when the tunnel is busy to work by adopting high-power air extraction of the air extraction box;
finally, the motor drives the air suction box to rotate, the position of an air suction opening of the air suction box faces towards the butt joint pipe, meanwhile, the air suction box enables the butt joint pipe to be communicated with the exhaust pipe, the air suction box works, waste gas in the tunnel can be sucked into the ventilation pipe through the air outlet and enters the butt joint pipe through the gas collection box, then the waste gas can be discharged into the access pipe through the exhaust pipe and is discharged from the air outlet, when a large amount of harmful gas is released in tunnel construction, the ventilation device can effectively absorb and discharge the harmful gas, the large ventilation range of the ventilation device is benefited, the suction range of the harmful gas is enlarged, multi-type ventilation and exhaust are carried out through the change of suction points of the air suction box, the access pipe can be free of branch-shaped auxiliary pipes for auxiliary ventilation, the cost and the convenience of the access pipe buried in the shaft can be effectively improved, in addition, the access pipe is divided into a left independent space and a right independent space, the left end air ventilation and the right end space exhaust are carried out, and the exhaust of the exhaust device can be realized by using a single access pipe in the harmful exhaust emission process.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A method for improving ventilation of an extra-long tunnel is characterized by comprising the following steps:
s1, opening reserved holes: a vertical shaft reaching the top of the tunnel is arranged outside the mountain, and a placement groove is arranged on the inner side of the top of the tunnel;
s2, fixing and assembling components: inserting an access pipe into the vertical shaft to expose the top end of the access pipe outside a mountain, extending the tail end of the access pipe into the placement groove, fixing a motor on the inner wall of the placement groove, aligning butt joints at two ends outside the air extraction box with the tail end of the access pipe and butting the butt joints, fixing a support plate with the inner wall of the bottom end of the placement groove after completing the operations, completing the butt joint of the air extraction box and the access pipe, fixing a gas collection box at the bottom end of the support plate, completing the butt joint of the gas collection box and the butt joints, inserting ventilation pipes into two ends outside the gas collection box, and fixing the ventilation pipes with the top of a tunnel channel;
s3, intermittent ventilation: the air inlet fan works to blow air outside the tunnel into the inlet pipe, the air extraction box works at the same time, the air inside the air collection box is evacuated through the butt joint pipe, so that the air collection box is vacuumized, after the air inside the air collection box is exhausted, the air extraction box stops working and enables the inlet pipe to be communicated with the butt joint pipe, a valve outside the butt joint pipe is opened at the moment, the air inside the inlet pipe can flow into the air collection box due to air pressure difference, then a valve outside the air collection pipe is opened, and fresh air inside the air collection box can enter the air collection pipe and enter the tunnel through the air outlet;
s4, high-power ventilation is carried out; the motor drives the air extraction box to rotate, so that the positions of two suction ports of the air extraction box are exchanged, the air inlet fan works to blow air outside the tunnel into the inlet pipe, the air extraction box works at the moment, the air in the inlet pipe can be sent into the air collection box through the butt joint pipe, and then the fresh air is sent into the tunnel through the air outlet by the ventilation pipe;
s5, exhaust gas emission: the motor drives the exhaust box to rotate, the position of an air exhaust opening of the exhaust box faces the butt joint pipe, the exhaust box enables the butt joint pipe to be communicated with the exhaust pipe, the exhaust box works, exhaust gas in the tunnel can be sucked into the ventilation pipe through the air outlet, the exhaust gas enters the butt joint pipe through the gas collecting box, and then the exhaust gas can be discharged into the access pipe through the exhaust pipe and is discharged from the air outlet.
2. The method for improving the ventilation of the extra-long tunnel according to claim 1, wherein in the step S1, the opened vertical shaft is communicated with the placing groove.
3. The method according to claim 1, wherein in the step S2, during the process of the docking seat and the access pipe and the docking pipe, the electric push rod operates to drive the extension pipe to move in the fixed pipe, so that the docking seat extends and completes the docking with the access pipe and the docking pipe.
4. The method for improving the ventilation of the extra-long tunnel according to claim 1, wherein in the step S2, the motor is integrated with the air extraction box, and the motor is fixed on the inner wall of the placing groove through a locking bolt.
5. The method of claim 1, wherein in step S3, when the air extraction box extracts air from the air collection box, the valve outside the air extraction box is in a closed state.
6. The method of claim 1, wherein in step S3, during the ventilation from the air collecting box to the ventilation pipe, the valves outside the ventilation pipe are intermittently opened and closed in sequence at various points at the outer end of the air collecting box.
7. The method according to claim 1, wherein in the step S4, before the motor rotates the air extraction box, the electric push rod operates to drive the extension pipe to move in the fixed pipe, so that the docking seat is separated from the access pipe and the docking pipe.
8. The method of claim 1, wherein in step S4, all valves outside the ventilation pipes are in an open state when the gas collection box supplies air to the ventilation pipes at each position.
9. The method as claimed in claim 1, wherein in the step S4, when the air extraction box rotates, the bearing rotation seat can rotate to offset the torque generated when the air extraction box rotates, so that the air extraction pipe is always located at the fixed position.
10. The method as claimed in claim 1, wherein in the step S5, the partition plate divides the inlet pipe into a left space and a right space, the left space is used for air ventilation, and the right space is used for air exhaust.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211308112.4A CN115680740A (en) | 2022-10-25 | 2022-10-25 | Method for improving ventilation of extra-long tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116294018A (en) * | 2023-05-22 | 2023-06-23 | 中建安装集团有限公司 | Energy-saving and emission-reducing ventilation device with multi-channel filtration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116294018A (en) * | 2023-05-22 | 2023-06-23 | 中建安装集团有限公司 | Energy-saving and emission-reducing ventilation device with multi-channel filtration |
| CN116294018B (en) * | 2023-05-22 | 2023-10-24 | 中建安装集团有限公司 | Energy-saving and emission-reducing ventilation device with multi-channel filtration |
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