CN111140270A - Mine ventilation energy-saving adjusting method - Google Patents

Mine ventilation energy-saving adjusting method Download PDF

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Publication number
CN111140270A
CN111140270A CN201911392815.8A CN201911392815A CN111140270A CN 111140270 A CN111140270 A CN 111140270A CN 201911392815 A CN201911392815 A CN 201911392815A CN 111140270 A CN111140270 A CN 111140270A
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fan
angle
mine
diffuser
energy
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CN111140270B (en
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张洪鹏
宋来智
刘玉德
郝飞
房其贤
彭振生
周广磊
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Daizhuang Coalmine Of Zibo Mining Group Co ltd
North China Institute of Science and Technology
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Daizhuang Coalmine Of Zibo Mining Group Co ltd
North China Institute of Science and Technology
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
    • E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a mine ventilation energy-saving adjusting method, which comprises an axial flow exhaust fan arranged at a mine opening, wherein the rated air volume of the axial flow exhaust fan is larger than the air volume required by a mine, the axial flow exhaust fan is provided with fan blades with adjustable angles, an air outlet of the axial flow exhaust fan is connected with a vertical diffuser, a guide plate is arranged in a 90-degree elbow of the vertical diffuser, and the energy-saving adjusting method comprises the following steps: determining the optimal energy-saving angle of fan blades and the optimal distribution of guide plates; the adjusting method is simple and quick, the electric energy consumption is greatly reduced on the basis of meeting the mine ventilation safety, and the operation cost is obviously saved.

Description

Mine ventilation energy-saving adjusting method
Technical Field
The invention relates to a mine ventilation energy-saving adjusting method, which enables a mine ventilation device to work in an optimal working state.
Background
The coal production system is in a pipe network type arrangement and semi-closed structure, various toxic, harmful, flammable and explosive disaster-causing factors such as gas, coal dust and the like coexist in the same environment, and the coal production system is a condition that coal mines are prone to cause a plurality of disasters and accidents. The mine ventilation system is more and more responsible in mines, and in order to meet the requirements of environmental sanitation and production safety, a proper amount of air quantity must be supplied to all underground working places. In the prior art, a mine ventilation mode is a central parallel mode, an air shaft is divided into an air shaft and an air outlet shaft, a drawing-out type ventilation method is adopted, a high-power mining axial flow fan is arranged near the wellhead of the air outlet shaft and is connected with the air outlet shaft by a fan drift, and the air outlet wellhead is sealed at the same time. When the mining axial flow fan operates, the air pressure in the fan cave is lower than the atmospheric pressure, the air is forced to enter the underground from the air inlet and is exhausted from the air outlet well, and the underground air pressure is lower than the atmospheric pressure. The mining axial flow fan is safe and reliable, has good ventilation effect, but also has the problems of high power and high power consumption.
Disclosure of Invention
The invention provides a mine ventilation energy-saving adjusting method, which not only ensures the safety of a mine, but also reduces the power consumption of a ventilation system and saves the operation cost.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a mine ventilation energy-saving adjusting method enables a mine ventilation device to work in the best working state and comprises an axial flow exhaust fan arranged at a wellhead of a coal mine air shaft, the rated air volume of the axial flow exhaust fan is larger than the air volume required by a mine, the fan is provided with fan blades with adjustable angles, a vertical diffuser is connected to an air outlet of the fan, and a guide plate is arranged in a 90-degree elbow of the vertical diffuser, wherein the energy-saving adjusting method comprises the following steps: determining the optimal energy-saving angle of fan blades and the optimal distribution of guide plates;
the optimal angle for determining the energy saving of the fan blades is that the angle of the fan blades with rated output air volume of the axial flow draught fan is started:
firstly, adjusting the angle of a fan blade of a fan gradually according to the reduced output air volume to obtain the air flow of the mine tunnel adjusted each time, stopping adjusting the angle of the fan blade of the fan when the wind flow reaches or approaches the rated air flow of the mine tunnel, and recording the data of each adjustment;
secondly, determining the angle of the fan blade higher than or equal to the rated air flow of the mine tunnel as the optimal energy-saving angle of the fan blade from the data;
the optimal distribution of the guide plates is determined by uniformly distributing at least 6 arc guide plates at intervals in the 90-degree elbow of the diffuser:
firstly, adjusting fan blades to be at an optimal energy-saving angle, gradually starting the fan, gradually adjusting the distribution combination of the 6 arc-shaped guide plates from two to six, and sequentially measuring, calculating and recording the diffusion efficiency of the diffuser;
secondly, the distribution of the guide plates with the maximum efficiency is selected from the recorded diffusion efficiency data, and the distribution is determined as the optimal distribution of the guide plates.
Further, the method comprises the following steps: the air flow of the mine roadway adjusted each time is obtained in the roadway through a manual handheld instrument after the fan blade angle of the fan is adjusted each time.
Further, the method comprises the following steps: the adjustment of the fan blade angle of the fan is adjusted by 4-degree increment or decrement.
Further, the method comprises the following steps: the arc length of the arc-shaped guide plate is a quarter of the circumference arc length of the 90-degree elbow of the diffuser, and the central bisector of the arc-shaped guide plate is superposed with the central bisector of the 90-degree elbow of the diffuser.
Further, the method comprises the following steps: the serial numbers 1-6 of the 6 arc-shaped guide plates are sequentially arranged from the inner side of a 90-degree elbow of the diffuser to the outer side, the optimal distribution of the guide plates is 2 or 4, and the 2 is the 2 nd and 5 th reserved after the serial numbers 1, 3, 4 and 6 are removed; the 4 pieces are the 2 nd, 3 rd, 4 th and 5 th pieces which are reserved after the serial numbers 1 and 6 are removed.
The mine ventilation safety regulating method has the advantages that the regulating method is simple and rapid, the electric energy consumption is greatly reduced on the basis of meeting the mine ventilation safety, and the operation cost is obviously saved.
The invention is described in detail below with reference to the figures and examples.
Drawings
FIG. 1 is a schematic view of a vertical diffuser structure;
FIG. 2 is a schematic diagram of the resistance relationship of an upright diffuser;
fig. 3 is a schematic view of an elongated arc-type baffle diffuser configuration.
Detailed Description
A mine ventilation energy-saving adjusting method enables a mine ventilation device to work in the best working state and comprises an axial flow exhaust fan arranged at a mine port, the rated air volume of the axial flow exhaust fan is larger than the air volume required by a mine, the axial flow exhaust fan is provided with fan blades with adjustable angles, the adjustable angles are increased by 4 degrees, the angles are adjusted within the range from-32 degrees to +20 degrees, an air outlet of the fan is connected with a vertical diffuser, as shown in figure 1, a guide plate A is arranged in a 90-degree elbow of the vertical diffuser and used for saving energy, a motor of the axial flow exhaust fan is controlled by a frequency converter, and the traditional star-angle starting control mode is removed. Two sets of axial flow exhaust fans are adopted in the mine, one set of axial flow exhaust fans is used as a main fan, and the other set of axial flow exhaust fans is used as a standby fan. After the main fan is debugged, the test run is carried out for a period of time, whether the underground air supply quantity can be met is measured, and the standby ventilator can be debugged after the air supply quantity meeting the mine air supply is confirmed.
The energy-saving adjusting method comprises the following steps: determining the optimal energy-saving angle of fan blades and the optimal distribution of guide plates;
the optimal angle for determining the energy saving of the fan blades is that the angle of the fan blades with rated output air volume of the axial flow draught fan is started:
firstly, adjusting the angle of a fan blade of a fan gradually according to the reduced output air volume to obtain the air flow of the mine tunnel adjusted each time, stopping adjusting the angle of the fan blade of the fan when the wind flow reaches or approaches the rated air flow of the mine tunnel, and recording the data of each adjustment;
secondly, determining the angle of the fan blade higher than or equal to the rated air flow of the mine tunnel as the optimal energy-saving angle of the fan blade from the data;
table 1 is the recorded data.
TABLE 1 statistical table of angle and power-saving rate of fan blades
Figure BDA0002345465930000041
Figure BDA0002345465930000051
And 80% rated air quantity of the fan is rated air flow of the mine tunnel. Therefore, the fan blade angle +4 degrees of the traditional fan with 100 percent rated air quantity is adjusted to-4 degrees, which is the best angle.
Wherein:
and the wind flow of the mine tunnel adjusted each time is obtained in the tunnel by a manual handheld instrument after the angle of the fan blade of the fan is adjusted each time.
The adjustment of the fan blade angle of the fan is adjusted by 4-degree increment or decrement.
The diffuser air duct baffle is a method for changing the air quantity of a mine by utilizing the position of an air quantity baffle in an air duct.
The main measure of the ventilation capacity of the main ventilator is the static pressure. Static pressure is beneficial wind pressure for overcoming network resistance, dynamic pressure directly enters and is dissipated in the atmosphere along with airflow to form useless loss, and a certain amount of dynamic pressure at the outlet of the fan can be converted into static pressure through the diffuser, so that the static pressure of the main fan is increased, and the resistance loss of the fan is overcome.
Three sections of the mine main fan and the diffuser are selected for analyzing the resistance relation, as shown in fig. 2, a section 1-1 of an air inlet of the main fan, a section 2-2 of an air outlet of the main fan and a section 3-3 of an air outlet of the diffuser are selected according to the flow direction of mine air: from section 1-1 to section 3-3, the energy equation is deduced to be:
hquiet＝PAll-purpose—h2-3—hr3
In the formula:
Pall-purpose-main fan capacity;
hquietThe ability of the main fan to overcome mine drag;
h2-3-diffusion resistance;
hr3-diffuser outlet kinetic energy loss.
Under a given operating condition, P is all constant, and if hSTAT is smaller, the kinetic energy at the diffuser outlet and the air flow resistance loss through the diffuser are larger. Decreasing h2-3 and hr3 can increase h calm.
Therefore, the centrifugal and axial flow type main ventilator needs to be externally connected with a diffuser with a reasonable structure at the air outlet, so that the static pressure efficiency of the ventilator is improved (the static pressure is converted from the dynamic pressure at the outlet, and the kinetic energy is recycled), and the exhaust noise is reduced.
The elbow air duct is an important component of the diffuser device, and the structural form of the internal guide plate of the elbow air duct has an important influence on the working performance of the diffuser. The influence rule of the arrangement form of the flow guide plate at the elbow on the recovery performance of the diffuser device is researched.
Thus, the optimal distribution of baffles is determined by arranging at least 6 arc-shaped baffles in the 90-degree bend of the diffuser in evenly spaced distribution as shown in fig. 1:
firstly, adjusting fan blades to be at an optimal energy-saving angle, gradually starting the fan, gradually adjusting the distribution combination of the 6 arc-shaped guide plates from two to six, and sequentially measuring, calculating and recording the diffusion efficiency of the diffuser;
secondly, the distribution of the guide plates with the maximum efficiency is selected from the recorded diffusion efficiency data, and the distribution is determined as the optimal distribution of the guide plates.
Wherein: the serial numbers 1-6 of the 6 arc guide plates are arranged in sequence from the inner side of the 90-degree elbow of the diffuser to the outer side.
Assumptions of the computational model in the numerical simulation:
(1) and calculating a flow field to be a steady-state flow field, wherein each time point of each variable is kept unchanged.
(2) The air within the diffuser is considered incompressible.
(3) The diffuser walls are thermally insulated, ignoring the effects of temperature.
(4) Neglecting the influence of gravity and air leakage.
The main boundary conditions of each calculation model are set as follows:
(1) the air flow velocity at the inlet of the device is 10.5 m/s.
(2) The pressure outlet conditions were set at 0Pa relative static pressure on the hemispherical boundary around the diffuser.
(3) The material used for the side wall is set to be cement.
There are two main reasons for local energy loss in diffusers:
firstly, when the air flows through the corner air duct, the speed of the fluid entering the diffusion section is unevenly distributed due to the action of inertia, the speed of the fluid is generally and gradually reduced from the outer side to the inner side of the side wall, the speed of the diffusion section close to the left side wall (outer side wall surface) is high, and the position of the No. six guide plates at the lowest part is too close to the outer side wall surface, so that the normal flow of the air flow is blocked; the static pressure of the sixth guide plate on one side facing the incoming flow direction is obviously increased to be close to 30Pa, which shows that the local resistance is serious at the position. After the air flows through the sixth guide plate close to the left side wall surface, the air flow diffusion process becomes unstable, and energy loss is caused.
Secondly, in the diffusion section, the air speed of the air flow is reduced along with the expansion of the section, the static pressure of the air flow is gradually increased, the speed of the air flow is gradually reduced to zero along the side wall under the action of the pressure difference opposite to the flow direction, particularly, the influence on the air flow area near the right side wall surface is obvious, the main flow is gradually separated from the wall surface, the flow opposite to the main flow direction is generated, the instability of diffusion is aggravated, and a relatively obvious vortex area is formed at the outlet of the diffuser close to the right side wall surface. The energy recovered by the device can be approximately expressed by the average static pressure difference of the inlet and outlet sections, the device provided with six guide plates only recovers about 2Pa of energy, and the diffusion efficiency is only 3%. The arrangement of the baffles at the bend should be further adjusted.
Tables 2 to 7 are recorded data.
Table 1: numerical simulation calculation result for installing six guide plates
Figure BDA0002345465930000081
Table 2: and (3) installing numerical simulation calculation results of five guide plates:
Figure BDA0002345465930000082
Figure BDA0002345465930000091
table 3: and (3) installing numerical simulation calculation results of four guide plates:
Figure BDA0002345465930000092
table 4: and (3) installing numerical simulation calculation results of three guide plates:
Figure BDA0002345465930000093
table 5: and (3) installing numerical simulation calculation results of three guide plates:
Figure BDA0002345465930000094
table 6: numerical simulation calculation result for installing two guide plates
Figure BDA0002345465930000095
Figure BDA0002345465930000101
Table 7: diffuser diffusion efficiency comparison table under different guide vane arrangement numbers and forms
Figure BDA0002345465930000102
Because of the existence of fluid inertia, air flows along the elbow and closely clings to the outer side wall surface, and is easy to generate vortex on the inner side wall surface close to the elbow. Because the near air velocity of outside lateral wall is big, if set up the guide plate and guide the wind direction too close to the wall, will consume more energy by chance. When six guide plates are installed, the six guide plates are too close to the outer side wall surface, so that the efficiency of the diffusion device is low. When five guide plates are installed, the adverse effect of the six guide plates is eliminated, and the diffusion effect is obviously improved. When three guide plates are installed, the diffusion effect is unstable due to uneven distribution of the plate spacing. When two or four pieces are installed, the distance between the guide plates is relatively uniform and the guide plates are not too close to the inner side wall surface and the outer side wall surface, so that the device obtains a better diffusion effect.
Simulation results are as follows: six guide plates have the worst operation effect, four or two guide plates have the best effect, and five or three guide plates have the second time.
Thus, the optimal distribution of the baffles is 2 or 4 pieces, and the 2 pieces are the 2 nd and 5 th pieces which are remained after the sequence numbers of 1, 3, 4 and 6 are removed; the 4 pieces are the 2 nd, 3 rd, 4 th and 5 th pieces remaining after the sequence numbers 1 and 6 are removed.
The aforesaid is short circular arc guide plate simulation result, and the circular arc length that is also the arc guide plate is less than quarter circumference radian length, is half of quarter circumference radian length, and: the short arc guide plate is installed on the outer side wall surface and can not be too close to the outer side wall surface, and eddy current is easily generated on the inner side wall surface. Therefore, the object is to design a long circular arc type (the streamline of the deflector corresponds to a quarter of the circumference) elbow deflector, as shown in fig. 3, the streamline of the deflector is consistent with the elbow air channel.
Thus, the arc baffle arc flow line corresponds to a quarter circle and the arc baffle arc length is the length of a quarter circle arc, and when installed, the arc baffle arc center bisector coincides with the diffuser 90 degree elbow center bisector.
The wind speed close to the left side wall in the wind channel of the long circular arc type (the streamline of the guide plate corresponds to a quarter of the circumference) elbow guide plate device under the simulated static pressure and speed distribution conditions of the long circular arc (1/4 circumference) guide plate is high, a vortex region is formed at the outlet of the diffuser, certain energy consumption is caused, but the whole recovery effect is good, the device recovers about 27Pa energy, and the diffusion efficiency is improved to 32%.
Table 8 is a set of data measured by arranging three baffles in the elbow, the position of which is entirely closer to the inner side wall surface.
Table 8: three-piece long arc guide plate device inlet and outlet section parameter table
Figure BDA0002345465930000111
Figure BDA0002345465930000121
According to the data numerical value result, the diffuser elbow guide plate form can enable the diffuser device to achieve a better recovery effect.

Claims (5)

1. A mine ventilation energy-saving regulation method enables a mine ventilation device to work in the best working state, and comprises an axial flow exhaust fan arranged at a mine air shaft mouth, wherein the rated air volume of the axial flow exhaust fan is larger than the air volume required by a mine, the fan is provided with fan blades with adjustable angles, a vertical diffuser is connected with an air outlet of the fan, and a guide plate is arranged in a 90-degree elbow of the vertical diffuser, and the energy-saving regulation method is characterized by comprising the following steps: determining the optimal energy-saving angle of fan blades and the optimal distribution of guide plates;
the optimal angle for determining the energy saving of the fan blades is that the angle of the fan blades with rated output air volume of the axial flow draught fan is started:
firstly, adjusting the angle of a fan blade gradually according to the reduced output air volume to obtain the air flow of the mine tunnel adjusted each time, stopping adjusting the angle of the fan blade when the wind flow reaches or approaches the rated air flow of the mine tunnel, and recording the data of each adjustment;
secondly, determining the angle of the fan blade higher than or equal to the rated air flow of the mine tunnel as the optimal energy-saving angle of the fan blade from the data;
the optimal distribution of the guide plates is determined by arranging at least 6 arc guide plates in the 90-degree elbow of the diffuser at uniform intervals:
firstly, adjusting fan blades to be at an optimal energy-saving angle, gradually starting the fan, gradually adjusting the distribution combination of the 6 arc-shaped guide plates from two to six, and sequentially measuring, calculating and recording the diffusion efficiency of the diffuser;
secondly, the distribution of the guide plates with the maximum efficiency is selected from the recorded diffusion efficiency data, and the distribution is determined as the optimal distribution of the guide plates.
2. The method of claim 1, wherein the obtaining of the wind flow rate of the mine roadway for each adjustment is obtained in the roadway by a manual hand-held instrument after each adjustment of the fan blade angle.
3. The method of claim 1, wherein the adjustment of the fan blade angle is adjusted in 4 degree increments or decrements.
4. The method of claim 1, wherein the arc length of the arc-shaped baffle is one-quarter of the circumferential arc length of the 90 degree elbow of the diffuser, and the bisector of the arc center of the arc-shaped baffle coincides with the bisector of the 90 degree elbow of the diffuser.
5. The method of claim 1, wherein the 6 arc baffles are arranged in sequence from the inner side to the outer side of the 90-degree elbow of the diffuser in the number of 1-6, the optimal distribution of the baffles is 2 or 4, and the 2 is the 2 nd and 5 th retained after the 1, 3, 4 and 6 serial numbers are removed; the 4 pieces are the 2 nd, 3 rd, 4 th and 5 th pieces which are reserved after the serial numbers 1 and 6 are removed.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112880026A (en) * 2021-03-23 2021-06-01 珠海格力电器股份有限公司 Air conditioner indoor unit and air conditioner
CN112963190A (en) * 2021-02-23 2021-06-15 重庆交通大学 Air exhaust device for tunnel
CN116146514A (en) * 2022-09-27 2023-05-23 上海莘汭驱动技术有限公司 Fluid dynamic state adjusting method based on axial flow fan

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CN206554967U (en) * 2017-03-23 2017-10-13 河南工程学院 A kind of underground coal mine ventilation unit
CN107605774A (en) * 2017-10-30 2018-01-19 重庆通用工业(集团)有限责任公司 A kind of airduct and blower fan system
CN209115137U (en) * 2018-09-19 2019-07-16 上海进贤机电科技有限公司 A kind of tunnel ventilation road guide-ring

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201858198U (en) * 2010-10-29 2011-06-08 万基控股集团有限公司 Diffusion tower structure for mine ventilation
CN103883343A (en) * 2014-03-24 2014-06-25 中国矿业大学 Method for replacing coal mine main fan without blowing-down on basis of adjustable moving blades
CN104712588A (en) * 2015-01-27 2015-06-17 中国矿业大学(北京) Novel mine axial flow ventilation diffuser
CN204796566U (en) * 2015-07-01 2015-11-25 李鑫 Long drive journey sprayer wind send rotatory air -flowing type dryer
CN206554967U (en) * 2017-03-23 2017-10-13 河南工程学院 A kind of underground coal mine ventilation unit
CN107605774A (en) * 2017-10-30 2018-01-19 重庆通用工业(集团)有限责任公司 A kind of airduct and blower fan system
CN209115137U (en) * 2018-09-19 2019-07-16 上海进贤机电科技有限公司 A kind of tunnel ventilation road guide-ring

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112963190A (en) * 2021-02-23 2021-06-15 重庆交通大学 Air exhaust device for tunnel
CN112880026A (en) * 2021-03-23 2021-06-01 珠海格力电器股份有限公司 Air conditioner indoor unit and air conditioner
CN116146514A (en) * 2022-09-27 2023-05-23 上海莘汭驱动技术有限公司 Fluid dynamic state adjusting method based on axial flow fan

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