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1. Application: It is applicable for negative pressure ventilation of local fan in coal mine, tunnel and underground.
2. Structure: According to the fabric material, the fan is divided into negative pressure air duct of rubber type, plastic type, rubber and plastic type.
3. Structure picture:
1-end ring 2-screw wires 3-mound layer 4-main rings 5-vice rings 6-coated fabric 7-fast joint soft belt
4. Size
|
Items |
Size |
Permitted error |
|
Diameter(D)(mm) |
300 400 450 500 600 800 1000 |
0±6 |
|
Length(L)(m) |
5 10 20 |
0±0.1 |
Note:
a. Different size or special shape of the abnormal shape fan, elbow and tee-junction can be made according to clients’ needs.
b. Special shape of the abnormal shape fan, elbow and tee-junction can be discussed by the seller and buyer.
c. Special requirements of the suspended ring and circle can be discussed by the seller and buyer.
d. Length of the air duct is 150-200mm with reversible sides on both ends.
5. Test report of air duct ventilation
|
Diameter(mm) |
Wind resistance per 100m(N·S 2 /M 8 ) |
Leakage rate per 100m % |
|
300 |
≤1728.0 |
≤5.0 |
|
400 |
≤410.0 |
≤5.0 |
|
500 |
≤134.0 |
≤5.0 |
|
600 |
≤54.0 |
≤5.0 |
|
800 |
≤13.0 |
≤5.0 |
Note: Every air duct is 10m.
6.Wind pressure resistance, shrinking rate
|
Diameter mm |
Steel wire spiral pitch mm |
Negative pressure resistance Pa |
Diameter shrinkage rate % |
|
300-500 |
100 |
≥5000 |
3 |
|
300-500 |
150 |
≥4500 |
5 |
|
600-800 |
100 |
≥4000 |
3 |
7. Package, Transportation and Storage.
a. Compress the air duct within 700mm length along the axial direction, fix 3-4 points by slope or cloth strip, then pack then by wearable materials.
b. The air duct should be kept from mechanical impact, friction, sun or rain during the transportation.
c. The products should be storage in the storeroom with good ventilation. The stacking should not be too high so as to avoid its usage quality. Clean and dry the ducts after work, then fold and storage them. Contact with any materials which is harmful to rubber or plastic is forbidden. Keep them from sun and rain. The storeroom temperature should be kept within -15℃-35℃, relative temperature should be within 47-75%. Keep more than 1m from heat source.
d. On the above transportation and storage conditions, the products’ inflaming resistance and anti-electric performance should be on accordance with the standard regulations within I year’s storage dated form the product.
e. The size of the air duct, elbow and tee-junction should be chose by the tunnel and fan delivery. Pay attention to the air-flow orientation.
f. Hang up the air duct and keep it straight, hang up it tightly, fix it while break, take turns slowly and open up the drains, thus can reduce the resistance.
(Fix: Clean and dry the breakage, add the glue water.)