Fans, ventilators, blowers: what’s the difference between them?

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Fans, ventilators, blowers: what’s the difference between them? Imagine that we live in an ocean filled with air. Sometimes, in order to make our lives and work more comfortable and efficient, we need to “move” this air around. At this point, it’s time to call on the members of the “fan family” to help. Although they are all \"strongmen\" that deal with the wind, they have different names, as well as vastly different abilities and temperaments. Simply put, fans form a large family, with ventilators and blowers being like two brothers of different “levels” within this family. Their most fundamental difference is that one is designed for \"large volume and ample supply,\" while the other is designed for \"high power and strong pressure.\" Elder brother: The ventilator – the worker that moves air; it’s like opening windows at home to let in fresh air. Its main task is to \"transport\" air from one place to another, or to make air \"flow\" within a certain space. For example, it is used to air-condition rooms in summer, to remove polluted air from factories, or to ventilate long tunnels. Since its main task is \"transporting\", it does not require much force (pressure), but it needs to be able to transport a large amount of air (air volume). Therefore, the characteristics of a ventilator are: high air volume and low pressure. What it pursues is a continuous flow that acts in a subtle, imperceptible manner. Second Brother: Blower — an air pressure pump/blower; it can be thought of as a “powerful hair dryer”. It not only has to move air, but also ‘pressurize’ it, giving it enough force to carry out more demanding tasks. For example, in wastewater treatment plants, high-pressure air is used to agitate the wastewater, helping bacteria break down the pollutants ； Or in factories, strong winds are used to blow granular materials like sand and grains to distant places. Therefore, the characteristics of a blower are high pressure and relatively low air volume. What it pursues is a powerful drive that can move mountains. Family “special skills”: How do they work? The members of the fan family have developed different “special skills” to serve various purposes. Turbine type (rotary type): It’s similar to when we turn an umbrella – the water droplets on it are flung out. Most ventilators fall into this category. They “throw” air out through a high-speed rotating impeller. Based on the shape of the impeller and the direction of the airflow, they can be further divided into centrifugal type (like a clothes dryer), axial flow type (like an electric fan), and mixed flow type (something in between). Positive displacement: This is similar to using a syringe to draw water. Through the back-and-forth or rotational movement of mechanical components, a certain volume of air is \"trapped\" in a space, and then forced to be compressed and \"pushed out.\" This method can generate very high pressures; therefore, blowers and more advanced compressors mostly fall into this category. In summary, so next time you see these devices, you can distinguish them simply in this way: if it is used to allow air to circulate and for ventilation, then it is likely a ventilator ； If it is used to generate high-pressure air currents to perform some labor-intensive tasks, then it is a blower. Although they have similar names, each has its own function, working together to maintain the normal functioning of our living environment and industrial production.