螺杆式风机工作原理及特点

一、螺杆风机的结构

1、 Structure of screw fan

以山东螺杆鼓风机为例，螺杆风机一般主要由外罩、主机、电机、空气过滤器、消音器、油泵油箱以及油虑等部分构成。锦工双螺杆鼓风机可根据客户要求进行定制，比如去掉外罩、改为无油系统等。

Taking shandong screw blower as an example, the screw blower is generally composed of cover, main engine, motor, air filter, muffler, oil pump, oil tank and oil filter. Jingong twin screw blower can be customized according to customer requirements, such as removing the cover, changing to oil-free system, etc.

螺杆主机作为螺杆风机的核心部件，其结构直接决定了风机性能的优劣。螺杆主机主要由机壳、螺杆转子、齿轮箱、轴承、轴封等主要部件构成。

As the core component of screw fan, the structure of screw host directly determines the performance of the fan. The screw host is mainly composed of casing, screw rotor, gearbox, bearing, shaft seal and other main parts.

二、螺杆风机的运行原理

2、 Operating principle of screw fan

螺杆式风机的运行原理是两根平行的阴阳转子在“∞”形气缸中相互啮合形成工作容积，通过同步齿轮，转子作反向高速转动，随着转子转动工作容积的大小发生周期性的变化，在气体输送过程中同时实现气体的压缩。螺杆式风机的工作循环可分为吸气、压缩和排气三个过程。其循环过程如下所示：

The operation principle of screw fan is that two parallel male and female rotors mesh with each other in "∞" shaped cylinder to form working volume. Through synchronous gear, the rotor rotates at high speed in reverse direction. With the rotor rotating, the working volume changes periodically, and the gas compression is realized in the process of gas transmission. The working cycle of screw fan can be divided into three processes: suction, compression and exhaust. The cycle process is as follows:

1、吸气过程

1. Inspiratory process

气体经吸气口进入转子齿间容积，随着转子的转动，齿间容积不断扩大，当齿间容积达到一定程度时，齿间容积与吸气口断开，吸气过程结束。

The gas enters the inter tooth volume of the rotor through the suction port. With the rotation of the rotor, the inter tooth volume expands continuously. When the inter tooth volume reaches a certain degree, the inter tooth volume is disconnected from the suction port, and the suction process ends.

3、排气过程

3. Exhaust process

齿间容积与排气口连通后，排气过程开始。转子转动过程中，齿间容积不断减小，将压缩后的气体送至排气管。此过程一直延续到该容积达

After the volume between teeth is connected with the exhaust port, the exhaust process begins. During the rotation of the rotor, the volume between the teeth decreases continuously, and the compressed gas is sent to the exhaust pipe. This process continues until the volume reaches

三、螺杆式风机的特点

3、 Characteristics of screw fan

与罗茨风机等不同，螺杆式风机在腔体内气体输送的过程中实现了内压缩，因此螺杆拥有罗茨大部分的优点之外，同时比罗茨具备更高的效率，且气体的输送压缩的过程是连续渐进的，气流脉动更低，排气噪音、温度控制等均要优于罗茨等传统风机。

Different from roots blower, screw blower achieves internal compression in the process of gas transmission in the cavity. Therefore, screw blower has most of the advantages of Roots blower, and has higher efficiency than roots blower. Moreover, the process of gas transmission and compression is continuous and gradual, with lower air flow pulsation, better exhaust noise and temperature control than roots blower.