What instrument can measure the outlet air volume of roots blower

There are two kinds of measurements, one is the measurement of the nature of the test, that is, the measurement of 1, the record number, and the completion.

The nature of the test is relatively simple, and the factors considered are relatively small, for example, according to the area of the outlet, the appropriate length of Bi tube + micro differential pressure handheld table DT4020C, the grid method selects multiple points, and then measures the differential pressure, calculates the flow rate, and finally calculates the air volume.

** There is a particular point in it, because the best suitability of the sensor should be considered for long-term work, it is recommended to choose the PBS95A array air volume measurement device, according to my experience, the plug-in measuring device is easy to be blocked by dust in the power bar and other bars. The hot type is more expensive, and the distribution is small, so it is not suitable to meet the requirements of scientific measurement.

Supplement. I see. That's easy to do.

Or two options.

1. Bi hosting +DT4020C micro differential pressure digital meter. At the inlet of the fan, the grid method measures the differential pressure at multiple points, calculates the flow rate according to the Bernoulli equation, and then calculates the air volume.

2. Buy a thermal flowmeter, and the probe rod is very long. The flow velocity at multiple points is measured at the inlet of the fan to calculate the air volume.

In general, it is necessary to pay attention to the fact that 1 must be measured at multiple points 2. It must be easy to test, such as long enough.

We used a flow meter, which was very accurate.

1. Before starting the roots blower, it is necessary to check the tightness of the bolts and nuts of each part of it, and if there is any looseness, it needs to be tightened in time.

2 62. Check the lubrication of the reducer, and add lubricating oil for lubrication in time to avoid causing jam.

3 63. Check the tension of the belt and the deviation of the pulley, the belt of the roots fan can neither be too loose nor too tight during operation, so it is necessary to check the tension of the belt before starting.

4 64. Check whether the power supply voltage and frequency of the fan are normal.

5 65. Check whether the instruments of the roots blower are normal, such as oxygen meter, pressure gauge, etc., and repair it immediately if it is abnormal.

6 66. Open the valve on the outlet and pipeline of the fan that needs to be run, and the outlet valve of the other fan that is not running is in the "closed" state to avoid overload operation of the fan and damage to the machine.

Check the surface condition of the impeller, if the surface is bright and there are pittings and pull marks, it means that there is a collision problem between the impellers of the fan. Check the pitting of the gear tooth surface and the loosening of the gear keyway and the key, when the tooth surface pitting exceeds the overall gear tooth surface by 30%-50%, the gear should be replaced; The gear keyway and key are too loose to fit will affect the size of the impeller assembly clearance, resulting in the impeller colliding with the fan noise and vibration, so the whole key should be replaced and the clearance should be adjusted.

Every place should be carefully inspected, even if it is a dirty tooth, it must be cleaned, and some abnormal places must be repaired.

Prove that all coordinates in our country are positive and artificially move the coordinate origin westward along the 2 axis)$$34), the scale factor is! , the base latitude is $ degrees. The three parameters of the ellipsoidal transition refer to the 5 translations, 6 translations, and 7 translations between ellipsoids, while the seven parameters refer to the 5 translations, 6 translations, 7 translations, 5 rotations, 6 rotations, 7 rotations, and scale factors between ellipsoids.

To obtain three or seven parameters, one or more common points are required, that is, to obtain the 0 coordinates and 89:1 0 coordinates of these points, or to obtain the $ coordinates and 89:1 0 coordinates of the points, so that the three or seven parameters can be solved, and the above parameter values are entered into the corresponding spaces of the software to establish a new coordinate system.

If needed, will!...)0 Beijing coordinates or!$Xi'an coordinates are converted to local coordinates, and four parameters need to be solved, namely:

5 translation, 6 translation, rotation angle, scale factor. We need to get the 0 coordinates and local coordinates or $ coordinates and local coordinates of these points, and we can convert the coordinate systems between coordinate systems in the software after obtaining the four parameters.

Once all the coordinate system definition and conversion problems have been completed, it is OK.

to proceed 9; : The constrained adjustment of the data works, and the high-precision control point coordinates will eventually be obtained through the adjustment.

The air volume in front of the fan and the air volume behind the fan are measured in the roadway, and then subtracted. It is also possible to measure the air volume at the return air inlet of the excavation head.

The air circulation per unit time has other subdivisions such as air supply volume and fresh air volume, and the air supply volume is used to indicate the capacity of ventilation equipment such as blowers, and the unit is cubic meters of seconds.

Air volume is equal to the duct area multiplied by the wind speed.

For example, the area of the air duct is square meters, and the amount of the wind speed is 12m s

The air volume is.

The air volume in front of the fan and the air volume behind the fan are measured in the roadway, and then subtracted, and the air volume at the return air inlet of the excavation head can also be measured.