CN87213227U - Closed recirculation loop reversable wind tunnel - Google Patents
Closed recirculation loop reversable wind tunnel Download PDFInfo
- Publication number
- CN87213227U CN87213227U CN 87213227 CN87213227U CN87213227U CN 87213227 U CN87213227 U CN 87213227U CN 87213227 CN87213227 CN 87213227 CN 87213227 U CN87213227 U CN 87213227U CN 87213227 U CN87213227 U CN 87213227U
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The utility model discloses a closed recirculation loop reversible wind tunnel which is a calibrating apparatus of a ventilation detecting meter by utilizing the wind tunnel principle. The utility model can exactly measure various wind meters and gas alarms in order to ensure that gas density and wind speed in underground tunnels can be measured reliably to prevent and decrease gas explosion accidents. The utility model is provided with a photoelectric digital indicator and uses an automatic starting and stopping apparatus of a wind meter, wherein the automatic starting and stopping apparatus is controlled by a transistor time relay. The utility model has the advantages of low cost, small size, light weight and low noise, and can be widely used for calibrating meters for mines, meteorology, traffic, environmental protection, measurement, etc. The utility model has certain practicability and popularization value.
Description
The utility model is the checking apparatus that adopts the ventilation measuring instrument of wind cave principle development, it is different from general open type wind cave, be easy to control return, make return follow certain route and reasonably spatial form motion, active section flow field equilibrium, stable and noise is low.Work can experimentize under the situation that is not subjected to the environmental conditions restriction.
The utility model is the measurement standard of loop reversable of remaining silent.Can measure all kinds of wind tables and fire alarm exactly for mine, measure gas density and wind speed in the underworkings reliably to ensure, prevent and reduce the generation of gas explosion accident, be a major measure that guarantees mine safety.
According to " Measurement Law of the People's Republic of China " the 9th regulation, the wind table that mine uses, fire alarm all belongs to the safety protection measurement instrument of state compulsion period regulation (calibrating), but the standard wind cave that measures these utensils does not also have professional production factory in China at present.It all is open closed formula that the wind cave of France's coal research center development and Fushun coal are ground the wind cave of being developed, and volume is big, and having relatively high expectations of environmental conditions all needs special-purpose chamber, and can only verification wind table, and does not possess gas meter assay calibration function.
The purpose of this utility model just is, can not only examine and determine the wind table, possess again the function of assay calibration gas meter, adopt and remained silent loop-type design wind cave main body and change the flow field sectional area with conversion regime, very controlled well return, wind cave performance is improved.
The utility model is furnished with the photoelectric figure display instrument, the wind table automatic start-stop device of transistor time relay control, doing the wind speed experiment, when proofreading and correct the height of DFA type, middle dead slow speed wind table, needn't use differential pressure gauge, Pitot tube, also start and stop and the manual stopwatch without manually-operated wind table comes timing, and regulates the voltage of dc motor with D.C. regulated power supply. Converse the vacuum wind speed by corresponding voltage → rotating speed → standard wind speed. Just can obtain satisfied experiment knot Fruit and wind wheat linearity curve accurately.
The utility model is widely used in mine, meteorology, traffic, building, environmental protection, scientific research, metering, school, instrucment and meter plant etc. and carries out instrument calibration and various relevant experiments.
The utility model cost is low, volume is little, in light weight, noise is low, easy and simple to handle.According to domestic available data introduction, every technical order all meets or exceeds the similar products at home and abroad level.Be worth so have certain practical value and promote, have great economic benefit and social benefit.
Task of the present utility model is achieved through the following technical solutions.
With reference to accompanying drawing, be plane structure chart of the present utility model.
The loop reversable wind cave of remaining silent is to drive centrifugal fan (2) by direct current motor (1) to produce distinguished and admirable.U is that the draught fan impeller fan outlet is distinguished and admirable upwards curved when entering the wind cave, becomes circle section (4) through outlet diversion section (3) four directions, distinguished and admirablely reduces energy loss under the effect of outlet guide plate.Before distinguished and admirable the entering during short circuit connecting section (5) through barge board C(barge board handle A, B fixes by jackscrew).When being parallel to the wind cave, handgrip, is the pass during perpendicular to the wind cave for opening.The distinguished and admirable shorted segment (16) that the enters during pass.Preceding short circuit connecting section (5) is crossed in wind circulation, and flow field sectional area ratio active section is big during middle connecting section (6), can reduce drag losses like this.
The distinguished and admirable diffuser (7) that enters spreads gradually, and becomes from all directions by circle that shape enters preceding diversion section (8).For controlling distinguished and admirable early stage separation and the eddy current that in diffusion process, forms, install first layer resistance net D in diffuser (7) outlet.Distinguished and admirablely under the effect of two groups of guide plate E, F, turn to 180 reposefully when entering before the low velocity zone diversion section (8), enter the stable section (9) of low velocity zone.
Distinguished and admirable enter stable section by honeycomb G be divided into some little square, make distinguished and admirable interior pressure the after turning round be tending towards average like this, it is even that flow velocity is tending towards, the effect of honeycomb that the formation honeycomb back three layer resistance net H that avoided initial stage eddy current and wave to gather around are assisted and strengthened again, the while has been eliminated the residual tail of honeycomb lattice again.Distinguished and admirable is at low-speed region through stable section, and energy loss is little.The distinguished and admirable contraction section (10) that enters is evenly quickened, and just very stable when entering active section (12) through becoming circle section (11) from all directions, Flow Field Distribution is even.Wind table start and stop device 1 is housed in the active section, and skin machine pipe J, fixed support K, available skin machine pipe micromanometer do various wind speed experiments.L is an air door, in adorn tested wind table.(13) be big transformation segment, (13) (14) can exchange as required, and are distinguished and admirable when entering little transformation segment (14), because actual internal area dwindles 4 times, resistance increases, and the active section flow velocity also reduces by 4 times, and it is constant at this moment to make low speed experiment flow field quality at active section.Because be provided with the effect of secondary stable section and the front stable section is basic identical at little transformation segment front end.At little transformation segment measuring section flow field also is stabilized uniform.
Distinguished and admirable when after later short circuit connecting section (15) enters diffuser (17), entering back diversion section (18) again the flow field sectional area increase.Wherein P is a guide plate, and it is in order to reduce the energy loss before return enters blower fan, to be convenient to do various harmful gas gauges and to edit experiment that sectional area increases.Various gas meters probe is all put in this section and is experimentized, and distinguished and admirablely enters blower fan by blower fan import diversion section (19) and finishes the reflux cycle of remaining silent, and the effect of this section guide plate is in order to improve fan efficiency.
When baffle plate C closes, distinguished and admirablely enter shorted segment (16) by preceding short circuit connecting section (5), barge board N closed close when machine N(major cycle was kept out the wind in shorted segment outlet at this moment), open barge board N air-flow and enter back short circuit connecting section (15), at this moment it is close that (15) intake grill has barge board M pass, forces distinguished and admirable process diffuser (17), and back diversion section (18) is got back to blower fan, finish the loop short circle of remaining silent, all kinds of harmful gas experiments are carried out in short circle.On back diversion section (18), five Q of gas probe placement device are arranged, two R of gas flow hole, blower fan IGV T, outlet guide plate S also has a square aperture, can take off wind cave shell baffle plate for the user and use.
Claims (2)
1, a kind of loop reversable wind cave of remaining silent is characterized in that having adopted the loop formation wind main body of remaining silent.
2, the loop reversable wind cave of remaining silent according to claim 1 is characterized in that wind cave main body is by direct current motor, centrifugal fan, outlet diversion section, and the four directions becomes the circle section, preceding short circuit connecting section, middle connecting section, diffuser, preceding diversion section, stable section, contraction section, round from all directions section, active section, big transformation segment, little transformation segment, back short circuit connecting section, shorted segment, diffuser, back diversion section, the import diversion section is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87213227 CN87213227U (en) | 1987-09-05 | 1987-09-05 | Closed recirculation loop reversable wind tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87213227 CN87213227U (en) | 1987-09-05 | 1987-09-05 | Closed recirculation loop reversable wind tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87213227U true CN87213227U (en) | 1988-06-15 |
Family
ID=4827763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87213227 Withdrawn CN87213227U (en) | 1987-09-05 | 1987-09-05 | Closed recirculation loop reversable wind tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87213227U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067220A (en) * | 2015-09-11 | 2015-11-18 | 中国矿业大学 | Mine ventilation network system experimental device and method |
-
1987
- 1987-09-05 CN CN 87213227 patent/CN87213227U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067220A (en) * | 2015-09-11 | 2015-11-18 | 中国矿业大学 | Mine ventilation network system experimental device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |