Title:
DOUBLE-DRAG MOLECULAR PUMP
Document Type and Number:
WIPO Patent Application WO/2007/041932
Kind Code:
A1
Abstract:
A double-drag molecular pump which has simple structure, is easily mass produced, and can enhance the effective pumped rate is disclosed. The double-drag molecular pump includes a helical stationary impeller(1) and a dynamic seal stage(8) fixedly provided at a pump casing(3), and a movable impeller(2) fixedly provided at a rotor(22), wherein said movable impeller(2), stationary impeller(1) and dynamic seal stage(8) are alternatively arranged each other at a certain gap, an air inlet(31) and an air outlet(32) are correspondingly arranged on the pump casing(3), a motor(5) is mounted on one side of a rotary shaft(21), at the two ends of which are mounted an end covers(33), respectively, it is characterized in that a plurality of parallel-connected and serial-connected stationary impellers(1) are commonly mounted on the same frame (11)which consists of a fixed ring(34) and a brace strut(35), a plurality of blades (36)for the stationary impellers are provided on the fixed surfaces of the brace struts(35); no fixed ring is mounted on the inner and outer side of the blades for the stationary impellers. The double-drag molecular pump according to the present invention can be concentrically mounted with other molecular pump or rotary mechanical vacuum pump to form a compound vacuum pump with better operation performance. The double-drag molecular pump according to the present invention can be applied to a variety of molecular pumps and rotary mechanical vacuum pumps.
Inventors:
CHU JIGUO (CN)
Application Number:
PCT/CN2006/002466
Publication Date:
April 19, 2007
Filing Date:
September 20, 2006
Export Citation:
Assignee:
CHU JIGUO (CN)
International Classes:
F04D17/02; F04D19/04; F04D29/60
Foreign References:
| CN1110376A | 1995-10-18 | |||
| CN1032574A | 1989-04-26 | |||
| US5927940A | 1999-07-27 | |||
| CN1039882A | 1990-02-21 | |||
| JP2001132683A | 2001-05-18 |
Attorney, Agent or Firm:
GUANGZHOU SCIHEAD PATENT AGENT CO., LTD. (Huihua Commercial & Trade Building No. 80, XianLie Zhong Roa, Guangzhou Guangdong 0, CN)
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