Not long ago, during the installation and commissioning of screw blowers, a customer of Qingyue energy saving, a screw blower manufacturer, found that the head of Qingyue energy saving equipment with the same power is much larger than that of another brand, so it leads to the question in the title. Why?

螺桿風機廠家簡單來解釋一下。我們知道螺桿鼓風機等容積式鼓風機種類較多，不管具體的哪種類型，它們都是通過工作腔容積的周期性變化而實現空氣輸送的。在設備選擇中，風量是其中基本的參數之一。那不同的機型，一定壓力下不同風量的大小是如何實現的呢？

Screw fan manufacturers to explain briefly. We know that there are many types of positive displacement blowers such as screw blowers. No matter which type is specific, they realize air transmission through the periodic change of working chamber volume. Air volume is one of the basic parameters in equipment selection. How do different models achieve different air volume under certain pressure?

以螺桿風機廠家的螺桿鼓風機產品為例，風量基礎的影響因素就是轉子與轉子以及腔體圍合形成工作腔體容積與轉速。這個工作腔體容積決定了鼓風機轉子一個周期傳輸的氣體量有多少。轉速就更容易理解了，決定了單位時間內轉子能完成多少個周期性變化。因此不考慮泄漏等影響因素，工作腔容積增加以及轉速的提高都能有用提高設備風量。

Taking the screw blower products of screw fan manufacturers as an example, the influencing factors of air volume basis are the volume and speed of working cavity formed by the enclosure of rotor, rotor and cavity. The volume of the working chamber determines the amount of gas transmitted by the blower rotor in a cycle. The speed is easier to understand, which determines how many periodic changes the rotor can complete per unit time. Therefore, without considering the influence factors such as leakage, the increase of working chamber volume and the increase of rotating speed can effectively improve the air volume of the equipment.

實際應用中，螺桿鼓風機工作腔的容積一方面與型線有關，另一方面與轉子與腔體的幾何大小有關。型線以及轉速一定的前提下，要提高風量就需要增加轉子與腔體的體積，這其中就涉及設備體積與各方面成本的增加。

In practical application, the volume of working cavity of screw blower is related to the profile on the one hand and the geometric size of rotor and cavity on the other hand. On the premise of a certain profile and speed, to increase the air volume, it is necessary to increase the volume of rotor and cavity, which involves the increase of equipment volume and cost in all aspects.

而通過轉速來增加風量更為便捷，但涉及到軸承的承受能力、密封等問題。轉速越高軸承磨損越嚴重、密封更容易泄漏，需要妥善應對。另外就是通過高速轉動來加大風量還會使鼓風機出口的空氣流速加大，帶來額外的噪音問題以及壓損，以及高轉速大離心力帶來動平衡、磨損等問題，維護需要更為細致。

It is more convenient to increase the air volume by rotating speed, but it involves the bearing capacity, sealing and other problems of the bearing. The higher the speed, the more serious the bearing wear and the easier the seal leakage, so it needs to be handled properly. In addition, increasing the air volume through high-speed rotation will also increase the air flow rate at the outlet of the blower, resulting in additional noise problems and pressure loss, as well as dynamic balance, wear and other problems caused by high-speed and large centrifugal force. Maintenance needs to be more detailed.