The set takes Roots pump as its main pump and spinning vacuum pump as pre-stage pump.
本机组采用罗茨泵作为主泵，以旋片式真空泵作为前级泵。
In this paper, a new deduction on the theoretical linear formula and the practical one of the involute, linear roots pump motor was made.
本文对渐开线型线罗茨泵转子的理论型线、实际型线公式做了新的推导。
As the Roots pump is a non-vacuum inside the compression, the compression ratio is usually very low, so high, medium and vacuum pumps need to pump before.
由于罗茨泵是一种无内压缩的真空泵，通常压缩比很低，故高、中真空泵需要前级泵。
Helical Roots pump has great improvements on the face of stabilizing pressure pulse quality of passing cut sensitivity medium, reducing noises and vibration, avoiding vapor fret etc.
螺旋式罗茨泵在稳定过流剪切敏感介质压力脉动质量，减少噪音、振动，避免气蚀等方面有较大改善。
Establishing the foundation to improve the rotor shape parameter dramatically, realizing the Roots pump series design and production, sufficing the condition of the agile manufacturing technology.
为不断完善转子型线参数，实现罗茨泵系列化设计、生产，满足敏捷制造技术需要奠定基础。
This paper introduced the advantage and characteristic of L-series roots blower, which could substitute the liquid ring pump in the process of hydrogen transportation.
本文介绍了L系列罗茨鼓风机在氢气输送过程中替代液环泵的优势与特点。
The distributed source boundary point method(DSBPM) based nearfield acoustic holography(NAH) is used for identifying and localizing noise sources of the roots vacuum pump.
采用基于分布源边界点法的近场声全息技术对运转状态下的罗茨真空泵进行了噪声源识别和定位研究。
Reply: : The goods supply scope for roots blower and centrifugal pump is not including cable.
答复：罗茨风机和离心泵供货范围中不需要带电缆。
In this paper, the structure feature of the Roots vacuum pump with by-way valve and its function in action are introduced.
本文介绍了旁通阀罗茨真空泵的结构特征、在使用中的作用。
In this article, the factors that affect the max. permissible differential pressure of Roots vacuum pump are discussed. The methods of increasing it are discussed together.
文章分析了影响提高罗茨真空泵最大允许压差因素，提出了解决方法。
There are many kinds of rotor profiles for roots vacuum pump.
罗茨真空泵的转子型线有很多种。
The utility model discloses an automatic controlling protective valve of a Roots vacuum pump used in the industries, such as paper making, chemical industry, ceramic, cigarette, etc.
本实用新型公开一种对造纸、化工、陶瓷、卷烟等行业所用的罗茨真空泵。
The utility model discloses an automatic controlling protective valve of a Roots vacuum pump used in the industries, such as paper making, chemical industry, ceramic, cigarette, etc.
本实用新型公开一种对造纸、化工、陶瓷、卷烟等行业所用的罗茨真空泵。
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