答：常见的罗茨风机的冷却方式有以下几种：

　　1、风冷

　　罗茨风机通过气体的输送和压缩产生热量，这些热量需要从转子传递到壳体进行散热。但是，在低压下，由于气体的热传导和对流性能差，转子吸收的热量难以散发，转子的温度总是高于壳体的温度。

　　转子的热膨胀会导致转子与转子之间、转子与泵壳之间的间隙减小，尤其是压差高时，可能会变得特别严重，导致转子粘连，导致泵损坏。为了使罗茨泵在高差压力下工作，扩大使用范围，提高泵的可靠性，需要设法排出转子产生的热量，即冷却转子。

　　为了了解空气冷却的本质，让我们来看看罗茨风机排气侧的气体流动。在罗茨风机中，吸入气体被压缩的过程是不连续的、突然的。吸入气体随着转子的旋转而被封闭在腔室内，另外，随着转子的旋转，腔室内的气体突然与排气口连接。

　　2、转子内部冷却

　　为了使罗茨风机在更高的压力差下工作，可以采用循环油冷却转子，在泵轴的两端分别安装油孔、油径轴头进行打入，通过转子内壁从另一端排出冷却方法。冷却油除了冷却转子外，还润滑齿轮和轴承。该冷却效果好，泵在运行时转子温度低于壳体温度，大泵多采用这种方式。

　　3、转子油膜冷却

　　该冷却方法是在罗茨风机的入口连接管路，用均匀滴下的冷却油吸收转子的热量。机油经过过滤器、冷却器，通过密闭的油泵，通过管线输送到泵的入口。向转子滴油后，随着转子的旋转，在转子表面变平。

　　它不仅可以吸收转子的热量，还可以在两个转子表面形成油膜，防止气体倒流，夺走附着在转子表面的细小灰尘。在泵出口设置油槽，收集废油，过滤，冷却后回收利用。

　　4、水冷

　　罗茨风机是指将中间级或二级泵吸入的空气压缩后，用与综合吸收有相位差的组合消音器输送。通过向泵内注入微量的水，可以去除压缩空气产生的热量。吸入管安装在单级或双级泵单元的进气端，与风机的进气口连接。水由风机在真空下吸入，真空度越大，吸入水量越高。简单调节阀应确保良好的吸入量，吸入水温度应保持在20度左右.

　　我们瑞柘环保生产的罗茨风机多数采用风冷模式，沉水风机与水冷风机采用的是水冷模式生产!同时我们生产的罗茨泵也是一样的哦！

How many cooling methods do you produce roots blower?

　　Answer: the common cooling methods of Roots blower are as follows:

　　1. Air cooling

　　Roots blower generates heat through gas transmission and compression, which needs to be transferred from rotor to shell for heat dissipation. However, at low pressure, due to the poor heat conduction and convection performance of the gas, the heat absorbed by the rotor is difficult to dissipate, and the temperature of the rotor is always higher than that of the shell.

　　The thermal expansion of the rotor will reduce the clearance between the rotor and the rotor and between the rotor and the pump shell. Especially when the differential pressure is high, it may become particularly serious, resulting in rotor adhesion and pump damage. In order to make roots pump work under high differential pressure, expand the scope of use and improve the reliability of the pump, it is necessary to try to discharge the heat generated by the rotor, that is, cool the rotor.

　　In order to understand the essence of air cooling, let's take a look at the gas flow on the exhaust side of Roots blower. In Roots blower, the compressed process of inhaled gas is discontinuous and sudden. The inhaled gas is enclosed in the chamber with the rotation of the rotor. In addition, with the rotation of the rotor, the gas in the chamber is suddenly connected with the exhaust port.

　　2. Rotor internal cooling

　　In order to make roots blower work under higher pressure difference, circulating oil can be used to cool the rotor, oil holes and oil diameter shaft heads can be installed at both ends of the pump shaft for driving, and the cooling method can be discharged from the other end through the inner wall of the rotor. In addition to cooling the rotor, the cooling oil also lubricates the gears and bearings. The cooling effect is good. When the pump is running, the rotor temperature is lower than the shell temperature. This method is mostly used for large pumps.

　　3. Rotor oil film cooling

　　The cooling method is to connect the pipeline at the inlet of Roots blower and absorb the heat of rotor with evenly dripping cooling oil. The oil is delivered to the inlet of the pump through the filter and cooler, through the closed oil pump and through the pipeline. After dropping oil to the rotor, it flattens on the rotor surface with the rotation of the rotor.

　　It can not only absorb the heat of the rotor, but also form an oil film on the surfaces of the two rotors to prevent gas backflow and take away the fine dust attached to the rotor surface. An oil tank is set at the pump outlet to collect waste oil, filter and recycle it after cooling.

　　4. Water cooling

　　Roots blower refers to compressing the air sucked in by the intermediate stage or secondary pump and conveying it with a combined silencer with phase difference from the comprehensive absorption. By injecting a small amount of water into the pump, the heat generated by compressed air can be removed. The suction pipe is installed at the air inlet end of the single-stage or two-stage pump unit and connected with the air inlet of the fan. Water is sucked by the fan under vacuum. The greater the vacuum, the higher the amount of water sucked. The simple regulating valve should ensure a good suction volume, and the suction water temperature should be maintained at about 20 degrees

　　Most roots fans produced by Ruizhe environmental protection adopt air-cooled mode, and submerged fans and water-cooled fans adopt water-cooled mode! At the same time, our roots pump is the same!