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Hubei jet fan-jet fan sales-jin blower group:Tianjin fan , Tianjin blower , Tianjin fan
Air velocity in the tunnel, proximity of fans to walls and vaults
Fan thrust is measured under air static conditions based on the change in air momentum of the fan. If the air at the fan inlet is in a moving state, the change in the air momentum in the fan must be reduced. If the installation location of the jet fan is close to the tunnel wall or vault, additional friction loss will inevitably occur between the air jet and the wall or vault.
The ratio of power consumption and thrust of a jet fan is related to the wind speed at the exit of the fan. For a given thrust requirement, the higher the outlet wind speed, the greater the power consumption. Therefore, in order to reduce operating costs, jet fans should be manufactured with large diameters, low speeds, or small blade angles. For a given fan size, if its thrust is reduced, it will inevitably lead to an increase in the number of fans, thereby increasing the investment in the fan itself, but at this time the wind speed at the outlet of the fan will also be reduced, making the muffler cancel or reduce its length.
Compared with unidirectional fans, reversible fans are slightly less efficient and have higher noise, but they can make tunnels more selective. In the case of special needs, the one-way tunnel can be used for two-way operation. In the event of a fire, the fan can reverse the exhaust smoke.
Acceptance of jet fans upon arrival
a. After opening the box, check whether the model and specifications of the fan are consistent with the order. After passing the inspection, you can proceed to the next step.
b. Examination of the appearance of the fan: if there is obvious damage, the appearance should be good, and there should be no damage to parts or rust.
c. Inventory all the equipment parts, tools, accessories, spare parts, auxiliary materials, and technical documents such as the factory certificate according to the packing list. If the above phenomenon occurs, please contact the general contractor and the manufacturer in time to resolve it.
d. Check the flexibility of the fan impeller by manual cranking. It is strictly forbidden for the impeller to rub against the casing. The clearance is generally not more than 0.5% of the diameter of the impeller.
e. After the inspection is completed, carefully make the unpacking inspection records.
Selection and characteristics of jet fan
1.Vertical spacing between each group of fans
If there is a satisfactory interval between each group of fans in the tunnel, the eruption airflow will gradually decelerate. If the eruption airflow is not completely decelerated, it will affect the task function of the next-level fan. Under normal conditions, the longitudinal interval between each group of fans is taken to be 10 times or more than the hydraulic equivalent diameter of the tunnel section, and one-tenth of the air dynamic pressure (Pa) of the fan can also be taken as the longitudinal interval (m) of the fan. The middle interval between the same group of fans is at least twice the diameter of the fan. The placement of jet fans in the tunnel need not necessarily have the same interval. As long as there is a satisfactory longitudinal interval between the fans, the fans can be placed as close to the tunnel opening as possible; if the axial device orientation of the fan allows a certain skew, then The longitudinal spacing between the fans can be reduced, and then the installation factor can be improved.
2.Air velocity in the tunnel, the closeness of the fan to the wall and the vault
Fan thrust is measured based on the change in air momentum of the fan under air stop conditions. If the air at the fan inlet is in motion, the change in the air momentum in the fan must be reduced. If the device of the jet fan is close to the tunnel wall or vault, the additional collision between the air jet and the wall or vault must be lost.
3.jet fan scale
The ratio of the power consumption and thrust of the jet fan is related to the wind speed at the outlet of the fan. Regarding a given thrust, the higher the outlet wind speed, the greater the power consumption. Therefore, in order to reduce working costs, jet fans should be able to use fans with large diameters, low speeds, or small vanes. Regarding a given fan size, if its thrust is reduced, the number of fans will definitely be incurred. Hubei jet fans, and then the fan's own capital will be added, but at this moment the wind speed at the outlet of the fan will also decrease, making the muffler cancel or reduce its length.
4. Reversible working fan
Compared with reversible fans, jet fans have lower prices, lower power, and higher noise, but such fans can make tunnel operation more selective. For example, in the case of rare needs, the one-way tunnel can be used for two-way operation. In the event of fire, the fan can be turned to exhaust smoke.
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