Vortex high-pressure fan

useVortex high-pressure fanBefore proceeding, it is necessary to understand:
1. Carefully read the fan user manual and product samples, familiarize and understand the specifications, form, impeller rotation direction, and airflow inlet and outlet direction of the fan; Recheck if all components of the fan are intact, otherwise they should be repaired before installation and use.
2. When installing the fan, safety devices must be installed to prevent accidents, and it must be installed and wired by professionals familiar with relevant safety requirements.
3. The air ducts connecting the inlet and outlet of the fan are separately supported, and it is not allowed to add overlapping weight to the components of the fan; When installing the fan, attention should be paid to the horizontal position of the fan. The connection between the fan and the foundation and the air outlet duct should be adjusted to fit naturally, and forced connection is not allowed.
4. After installing the fan, use your hand or lever to move the impeller and check for any tightness or rubbing, as well as any objects that may hinder rotation. Only when there are no abnormal phenomena can the test run be carried out. The exposed part of the fan transmission device should have a protective cover (provided by the user). If the fan inlet is not connected to the pipeline, a protective net or other installation device (provided by the user) should also be added.
5. The distribution control box of the fan must be matched with the corresponding fan (referring to power, voltage, pneumatic mode, control form, etc.).
6. The wiring of the fan should be done by a professional electrician, and the wiring must be correct and reliable, especially the wiring number at the electrical control box should correspond to the number on the fan terminal. The fan casing should be reliably grounded, and grounding must be reliable. Zero grounding cannot be used instead of grounding.
7. After installing all the fans, check whether there are any remaining tool boxes or debris inside the fans

Vortex high-pressure fanSummary of total pressure, dynamic pressure, and static pressure:
1、 When in use, with only an intake pipe and an outlet open to the atmosphere, the relative static pressure at the fan outlet is zero. The total pressure at the outlet of the fan is equal to the dynamic pressure at the outlet of the fan. At this point, the total pressure of the fan is equal to the difference between the outlet dynamic pressure and the inlet total pressure of the fan (at this point, the inlet total pressure is negative, and the difference between the two is actually the sum of the two), while the inlet total pressure is equal to the sum of the static pressure (negative value) measured at the inlet of the fan and the dynamic pressure (equal to the static pressure value measured at the collector). If the inlet and outlet areas of the fan are equal, it can be considered that the dynamic pressure at the inlet and outlet of the fan is equal (continuous equation). At this time, the total pressure of the fan can be considered to be equal to the static pressure measured at the inlet flange of the fan. (See Figure 1)
The calculation formulas for static pressure, dynamic pressure, and total pressure of the fan in the intake test can be found in the article "Application Example of Ventilation Fan Intake Test - Standard Formula" in the "Application Example".
2、 When in use, with only an exhaust pipe and an inlet open to the atmosphere, it can be considered that the relative total pressure at the inlet of the fan is zero. At this time, the total pressure of the fan is the sum of the outlet static pressure and the outlet dynamic pressure. The static pressure of the fan can be directly expressed as the outlet static pressure of the fan (but not the static pressure value measured at section 2, but the static pressure value measured at section 2 plus the static pressure loss from this measuring point to the fan outlet). The dynamic pressure of the fan is equal to the dynamic pressure at the outlet of the fan (when the area of the outlet pipe does not change, the dynamic pressure from the fan outlet to the outlet connection outlet is equal, without calculating the loss of dynamic pressure).
3、 In use, in a fan with inlet and outlet pipes, the inlet total pressure of the high-pressure blower fan is equal to the sum of the static pressure (negative value) measured at the measuring point at the fan inlet flange (if the measuring point is not located at the fan inlet, the static pressure at the fan inlet should be added to the static pressure at the measuring point plus the loss along the way from this point to the fan inlet) and the dynamic pressure at this point (equal to the static pressure measured at the inlet collector). The outlet total pressure of the fan is equal to the sum of the outlet dynamic pressure and the outlet static pressure. The total pressure of the fan is equal to the difference in total pressure between the inlet and outlet of the fan. If the inlet and outlet areas are equal, the total pressure of the fan is equal to the difference between the static pressure at the outlet measuring point and the static pressure at the inlet flange measuring point. The static pressure of the fan is equal to the difference between the static pressure at the outlet of the fan, the static pressure at the measuring point on the inlet flange of the fan, and the dynamic pressure at the inlet (equal to the value of the static pressure measured at the inlet collector). The difference between the sum of the outlet static pressure and outlet dynamic pressure of the fan and the inlet total pressure (equal to the sum of the static pressure measured at the inlet flange and the dynamic pressure at the inlet flange) (because the inlet static pressure is negative, the difference between the two is actually the sum of their values) is equal to the total pressure of the fan. If the inlet and outlet areas of the fan are the same, and the dynamic pressure at the inlet and outlet can be considered roughly equal, the static pressure of the fan is equal to the difference (actually the sum) between the static pressure measured at the outlet flange and the static pressure measured on the inlet flange side, minus the dynamic pressure at the fan inlet (which is approximately equal to the static pressure measured at the inlet manifold flange of the fan)
The calculation formulas for static pressure, dynamic pressure, and total pressure of the fan in the intake test can be found in the article "Application Examples of Ventilation Fan Inlet and Outlet Test - Standard Formula" in the "Application Examples".
Conclusion: The following approximate conclusion can be drawn from the above discussion:
(1) The static pressure of the fan only exists in the inlet and outlet pipe network of the fan and is always equal to the resistance of the pipe network. The relative static pressure of the fan at the outlet of both ends of the pipe network is equal to "zero".
(2) The dynamic pressure of the fan is not consumed in the fan inlet and outlet pipe network. When the cross-sectional area of the fan inlet and outlet pipe network is the same, the dynamic pressure of the fan inlet and outlet is equal. If the cross-sectional area of the pipeline network is different, the dynamic pressure in the pipeline network is also different (according to the continuity equation, the mass flow rate of any section is the same, so the dynamic pressure is different)
(3) In the inlet and outlet pipe network of the fan, the total pressure shows an upward and downward trend, and the static pressure of the fan is completely consumed in the pipe network resistance. The total pressure at both ends of the pipe is equal to the dynamic pressure.
(4) When the fan only has an inlet duct without an outlet duct, the static pressure value measured at the inlet flange of the fan is the inlet static pressure of the fan. When the inlet and outlet areas of the fan are equal, this static pressure is equal to the total pressure of the fan.
(5) As mentioned above, when calculating the static pressure of a fan, it is necessary to subtract the dynamic pressure contained in this static pressure from it. That is to say, the value of the inlet static pressure of the fan is greater than the static pressure of the fan.