Introduction:

The pump consists of two figure “8” shaped rotors and two semicircular pump houses. The rotors rotate synchronously in

opposite directions and high speeding. The pump cannot be used singly; it must be used as boosters combined with a backing

pump such as a rotary piston or a rotary vane vacuum pump, or a liquid ring vacuum pump. These vacuum systems can get higher

vacuum, a stable, fairly high pumping speed can be gained in effective pressure range. The backing pump decides the ultimate

pressure of roots pump. The data of the list is lowest ultimate pressure with the standard equipment (equipped double stage oil machine vacuum pump).

The Roots pumps are widely used in vacuum moulding, vacuum smelting, vacuum gas pumping, vacuum coating industry, vacuum distilling and vacuum

drying of chemical and pharmaceutical industry etc. The pump is insensitive to a little dust.

Features:1. The lack of reciprocating parts allows a perfect dynamic balancing, because the rotors is processed by numerical control machine tool and balanced carefully.

It has perfect geometry symmetry. There is certain clearance between the two rotors. The pump house and end-cover is processed by especial machine tool. It has high precision. So the pump own feature of stable operation, low noise, low vibration and high ultimate pressure.

2. The robust drive of ump and operating parts balanced carefully permit that the pump be stably operated continuously under the condition of high different pressure.

3.They can be started quickly, and in short time ultimate pressure is reached

4. Lubrication is unnecessary as there is no contact between rotors, rotor and house, that avoid oil vapor from polluting vacuum system.

5. Good reliability characteristic. Their inherent overflow valve play auto-protective role.

6. Compact structure, low footprint design. There are three gas outlet ports that are in left, right and under pump house. It is convenient for consumer installing.

Shandong China Coal Industrial&Mining Supplies Group Co.,Ltd (hereinafter referred to as china coal) is a group company, which is a collection of e-commerce, machinery manufacturing, software, research and development, modern logistics of large diversified industrial group. The group has 100 million yuan registered capital , with more than 1100 employees.

China coal is a professional manufacturing base of mines support equipment, transport equipment, lifting equipment, spray equipment, drilling equipment, ventilation equipment, lifting equipment and other products, as well as research and development new product and mine construction products with advanced high technology.

In order to development of international trade , expansion overseas market, china coal established international trade branch company and import and export branch company. China coal actively expand foreign trade channels based on a good market image, brand, modern information platforms and capital protection. Based on the trading diversification strategy, the group established a chain loop trading system which is with import and export trade of the mining equipment as a core, the resources and market as the elements. China coal also formed an overseas sales team, that covers English, French, German, Portugal, Italy, Russian, Korean, Japanese, Arabic, and more than 10 language professionals to explore broader international markets on the Internet. At present, the group signed up for "china coal" trademark in the European Union, United States, Russia, United Kingdom, Taiwan, Macao, Singapore, Indonesia, Israel, and other countries, also got the right to use the trademark of the United Kingdom and Taiwan. Hundreds of kinds of products such as tunnel boring machine, coal cutter machine etc. is exported more than 60 countries and regions which are the United States, Australia, Germany, Russia, Spain, France, Canada, United Kingdom, Italy, Portugal, Georgia, Austria, and Colombia. China coal is to establish long-term, broader economic and trade cooperation and strategic partnership with a number of large state-owned enterprises and customers, and won the unanimous approval of them.

China coal has succeeded in passing a number of certification systems which are ISO9001, 2008 quality management system certification, United States ANAB management system certification, United Kingdom international authoritative certification bodies UKAS quality management system certification, SGS certification (made in China), Alibaba GIS certification. She has also obtained a variety of honor which are China excellent enterprise of mechanical industry, China equipment manufacturing operation top 10 enterprises, national reputation for quality assured supplier, China credit certification system demonstration unit, national quality trustworthy product for conformity assessment, national consumer satisfaction units, China AAA level quality trustworthy enterprise and Chinese e-commerce company credit rating AAA level credit Enterprise.