碟片式离心机：离心机的防爆要求是什么？

       Disc-type centrifuges: What are the explosion protection requirements for centrifuges?

　　离心机广泛应用于国民经济的许多领域，如化工、制药等。它仍然是化学中间体和医药原料生产过程中固液分离的主要设备。那么，碟片式离心机：离心机的防爆要求是什么呢?

       Centrifuges are widely used in many fields of national economy, such as chemical industry and pharmaceutical. It is still the main equipment for solid-liquid separation in the production of chemical intermediates and pharmaceutical raw materials. So, disc-type centrifuge: what are the explosion-proof requirements for centrifuges?

　　碟片式离心机：离心机的防爆要求是什么？

       Disc-type centrifuges: What are the explosion protection requirements for centrifuges?

　　我们知道，引起爆炸的三个因素是温度、火源和氧气。防止化学爆炸的三个基本条件共存是防止可燃物质化学爆炸的基本理论。换句话说，所有防止可燃物质化学爆炸的技术措施的实质是防止化学爆炸的三个基本条件的共存。包括：

　　1、温度，对于特定的介质，无论是液体还是气体，在工艺设计中要考虑离心机的工作温度，这主要取决于工艺条件，这里不做详细分析;

　　2、火源，在离心机的设计中，应为运动部件提供足够的安全和空的转子泵室，以消除可能的机械摩擦和冲击。同时，机器需要有消除静电的措施。至于制动装置，不允许使用机械摩擦制动装置，一般采用电能消耗制动(非接触制动的缺点是制动时间比接触制动长，尤其是满载时转动惯量大)。另外，对于传动带，选择防静电带，消除或减少静电的可能性。

　　3、氧气，一般用惰性气体保护，充氮气置换离心机内的空气，使氧气浓度保持在安全范围内。

We know that the three factors that cause explosions are temperature, ignition source and oxygen. The coexistence of three basic conditions for preventing chemical explosion is the basic theory of preventing chemical explosion of combustible substances. In other words, the essence of all technical measures to prevent chemical explosions of combustible substances is the coexistence of three basic conditions for the prevention of chemical explosions. Include:

1, temperature, for a specific medium, whether liquid or gas, in the process design to consider the centrifuge working temperature, which mainly depends on the process conditions, here do not do a detailed analysis;

2. Ignition source. In the design of the centrifuge, sufficient safety and empty rotor pump chamber should be provided for the moving parts to eliminate possible mechanical friction and impact. At the same time, the machine needs to have measures to eliminate static electricity. As for the brake device, the mechanical friction brake device is not allowed to use, and the general use of electric energy consumption brake (non-contact brake has the disadvantage of longer braking time than contact brake, especially when the full load of inertia). In addition, for the drive belt, choose an anti-static belt to eliminate or reduce the possibility of static electricity.

3. Oxygen is generally protected with inert gas, and the air in the centrifuge is replaced with nitrogen to keep the oxygen concentration within a safe range.

　　碟片式离心机：离心机有什么防爆措施？

　　目前离心机常用的氮气保护只是在外壳上设置一根氮气进气管和一根氮气出气管。离心机工作时，空腔内充入氮气。至于氮气浓度能否达到安全范围，没有定量控制，所以氮气保护的可靠性很差。在改进后的氮气保护系统的设计中，设置了在线氧气检测装置和压力传输传感器，检测运行中离心机腔室内的氧气浓度，并进行定量控制，将氧气含量控制在安全范围内。

Disc-type centrifuge: What are the explosion-proof measures for centrifuges?

At present, the common nitrogen protection of centrifuges is only a nitrogen inlet pipe and a nitrogen outlet pipe set on the shell. When the centrifuge works, the cavity is filled with nitrogen. As for whether the nitrogen concentration can reach the safe range, there is no quantitative control, so the reliability of nitrogen protection is very poor. In the design of the improved nitrogen protection system, an online oxygen detection device and a pressure transmission sensor are set to detect the oxygen concentration in the centrifuge chamber during operation, and quantitative control is carried out to control the oxygen content within a safe range

　　碟片式离心机：离心机主要有哪些分类？

　　1、恒速离心机

　　Fr3500(一般600~1200)。这台离心机转速低，直径大。

　　2、高速离心机

　　Fr=3.500~50.000.这种离心机转速高，一般转鼓直径小，长度长。

　　3、高速离心机

　　Fr50000由于转速高(50000r/min以上)，滚筒做成细长的筒状。

　　分离系数Fr是指离心力场中物质的离心力与重力场中物质的重力之比。

Disc-type centrifuges: What are the main types of centrifuges?

1. Constant speed centrifuge

Fr3500(generally 600 to 1200). This centrifuge has a low rotational speed and a large diameter.

2. High speed centrifuge

Fr=3.500~50.000. This type of centrifuge has high rotational speed, small diameter and long length.

3. High speed centrifuge

Due to the high rotational speed (above 5000R /min), the roller of Fr50000 is made into a slender cylinder.

The separation coefficient Fr is the ratio of the centrifugal force of a substance in the centrifugal force field to the gravity of a substance in the gravitational field.