CN111140270B - Mine ventilation energy-saving adjusting method - Google Patents
Mine ventilation energy-saving adjusting method Download PDFInfo
- Publication number
- CN111140270B CN111140270B CN201911392815.8A CN201911392815A CN111140270B CN 111140270 B CN111140270 B CN 111140270B CN 201911392815 A CN201911392815 A CN 201911392815A CN 111140270 B CN111140270 B CN 111140270B
- Authority
- CN
- China
- Prior art keywords
- fan
- diffuser
- mine
- angle
- guide plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009423 ventilation Methods 0.000 title claims abstract description 21
- 238000009792 diffusion process Methods 0.000 claims description 19
- 238000013459 approach Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000004088 simulation Methods 0.000 description 9
- 238000004364 calculation method Methods 0.000 description 7
- 239000003245 coal Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- 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
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 for coal mines to easily cause a plurality of fatigued 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 mine axial flow fan is arranged near the mouth of the air outlet shaft, the high-power mine axial flow fan is connected with the air outlet shaft through a fan drift, and the mouth of the air outlet shaft 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 with 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 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.
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 one fourth of the circumference arc length of the 90-degree elbow of the diffuser, and the arc-shaped center bisector of the arc-shaped guide plate is superposed with the center 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 as energy-saving, 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 main fan is trial run for a period of time, whether the underground air supply quantity can be met is measured, and the standby fan 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 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;
table 1 is the recorded data.
TABLE 1 statistical table of angle and power-saving rate of fan blades
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:
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.
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 energyForce;
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 duct is an important component of the diffuser device, and the structure form of the internal guide plate of the elbow duct has 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 lowest six guide plates is too close to the outer side wall surface, so that the normal flow of the air flow is hindered; 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 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 recovered energy of 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 percent. 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
Table 2: and (3) installing numerical simulation calculation results of five guide plates:
table 3: and (3) installing numerical simulation calculation results of four guide plates:
table 4: and (3) installing numerical simulation calculation results of three guide plates:
table 5: and (3) installing numerical simulation calculation results of three guide plates:
table 6: numerical simulation calculation result for installing two guide plates
Table 7: diffuser diffusion efficiency comparison table under different guide vane arrangement numbers and forms
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.
Therefore, the optimal distribution of the guide plates is 2 or 4, and the 2 is the 2 nd and 5 th sheets remained 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 above-mentioned be short circular arc guide plate simulation result, be that the circular arc length of 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
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 (3)
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, selecting the distribution of the guide plates with the maximum efficiency from the recorded diffusion efficiency data, and determining the distribution as the optimal distribution of the guide plates; 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 reserved 2 nd, 3 rd, 4 th and 5 th pieces after the serial numbers 1 and 6 are removed;
the arc length of the arc-shaped guide plate is one fourth of the circumference arc length of the 90-degree elbow of the diffuser, the streamline of the guide plate is consistent with that of the elbow air channel, the radian center bisector of the arc-shaped guide plate is superposed with the center bisector of the 90-degree elbow of the diffuser, and the arc-shaped guide plate is integrally close to the inner side wall of the 90-degree elbow of the diffuser.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911392815.8A CN111140270B (en) | 2019-12-30 | 2019-12-30 | Mine ventilation energy-saving adjusting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911392815.8A CN111140270B (en) | 2019-12-30 | 2019-12-30 | Mine ventilation energy-saving adjusting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111140270A CN111140270A (en) | 2020-05-12 |
| CN111140270B true CN111140270B (en) | 2022-04-01 |
Family
ID=70521707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911392815.8A Active CN111140270B (en) | 2019-12-30 | 2019-12-30 | Mine ventilation energy-saving adjusting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111140270B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963190B (en) * | 2021-02-23 | 2023-05-16 | 重庆交通大学 | Air exhaust device for tunnel |
Citations (7)
| 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 |
-
2019
- 2019-12-30 CN CN201911392815.8A patent/CN111140270B/en active Active
Patent Citations (7)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111140270A (en) | 2020-05-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203516203U (en) | Centrifugal fan, volute thereof and sweeper truck | |
| CN111140270B (en) | Mine ventilation energy-saving adjusting method | |
| ITVI20070158A1 (en) | UNIT FOR THE TREATMENT OF AIR WITH CONTROLLED FLOW | |
| CN209818098U (en) | Natural ventilation system for long and large tunnel shaft | |
| Liu et al. | Effect of inlet guide vanes on the performance of small axial flow fan | |
| CN202493456U (en) | Jet flow type induced ventilator | |
| CN201546981U (en) | Axial flow fan in super long tunnel construction on plateau | |
| CN201344554Y (en) | Cooling device for power station boiler blower | |
| CN204612058U (en) | Air flow exchanging device | |
| CN201386671Y (en) | Axial flow type inducing fan | |
| CN102840182A (en) | Low-load vibration control method for axial flow fan of thermal power plant and bypass air duct control loop | |
| CN110887206A (en) | Air duct of air conditioner with lower air supply | |
| CN207920901U (en) | Axle induced-draft fan system | |
| CN203797829U (en) | Outlet air protection structure and outdoor unit of air conditioner | |
| CN203516111U (en) | Noise insulation enclosure for roots blower | |
| CN112856514A (en) | Range hood and control method thereof | |
| WO2019200910A1 (en) | Bladeless fan having improved air duct structure | |
| CN218717772U (en) | Ventilation and cooling system for sound insulation cover of fan | |
| CN216008946U (en) | Low-noise fan for heat exchange station | |
| CN205243964U (en) | Centrifugal fan sound -proof box device of area heat dissipation function | |
| CN204031706U (en) | Drive-type cooling system | |
| CN205136062U (en) | Square pipe shape fan | |
| CN111457510B (en) | Humidification device on cooling fan | |
| CN203035617U (en) | Energy-saving fan used for fresh air equipment of machine room | |
| CN215566877U (en) | Centrifugal fan volute structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |