Vacuum pump

a vacuum pump and valve body technology, applied in the direction of liquid fuel engines, machines/engines, rotary piston liquid engines, etc., can solve the problems of complex fitting of sealing members and high manufacturing cost, and achieve the effect of preventing the formation of leakage paths

Inactive Publication Date: 2017-07-20
EDWARDS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an improved seal arrangement for a clam shell pump, and a multi-stage vacuum pump with better sealing between the various components. This helps to create a more efficient and effective vacuum pump with reduced leakage and improved performance.

Problems solved by technology

The sealing member is however generally quite intricate to fit in place and expensive to manufacture.

Method used

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  • Vacuum pump
  • Vacuum pump
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Examples

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Embodiment Construction

[0022]By way of background to the invention, US2002155014 discusses the problem of sealing a clam shell stator. In particular, it indicates that leakage lines exist between a longitudinal gasket providing peripheral radial sealing and O-rings providing axial sealing at the ends, which results in unsatisfactory sealing. As a consequence the patent proposes a one-piece three-dimensional sealing member as discussed above. This three-dimensional sealing member is expensive to manufacture and intricate to fit in place.

[0023]Previous patent applications of the present applicant have proposed the use of four separate sealing components, namely two longitudinal sealing members, or gaskets, for sealing between the half-shell components 102, 104 in FIG. 1 and two annular sealing members, or O-rings, for sealing between the end faces of the half-shell components and the end stator components 122, 124. Considerable difficulty was encountered when sealing at the interfaces between the longitudin...

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Abstract

The present invention relates to a multi-stage vacuum pump comprising: first and second half-shell stator components and first and second end stator components which when assembled define a plurality of pumping chambers. The half-shell components are assembled together along respective pairs of mutual engaging longitudinal faces and the end stator components are assembled at the ends of the half-shell components at respective pairs of mutual engaging end faces. An annular channel is counter-sunk in at least one end face of each pair of mutual engaging end faces for receiving respective sealing members for sealing between the half-shell components and the end stator components. Recesses are counter-sunk at the end portions of the longitudinal faces for receiving a sealant and supports provide support for the annular sealing members at the recesses when the annular sealing members are received in the annular channels to resist protrusion of the annular sealing members into the recesses when compressed between mutually engaging end faces.

Description

[0001]This application is a national stage entry under 35 U.S.C. ยง371 of International Application No. PCT / GB2015 / 052068, filed Jul. 17, 2015, the entire content of which is incorporated herein by reference.TECHNICAL FIELD OF THE INVENTION[0002]The present invention relates to a vacuum pump, in particular a multi-stage vacuum pump and a stator of such a pump.BACKGROUND TO THE INVENTION[0003]A vacuum pump may be formed by positive displacement pumps such as roots or claw pumps, having one or more pumping stages connected in series. Multi-stage pumps are desirable because they involve less manufacturing cost and assembly time compared to multiple single stage pumps in series.[0004]Multi-stage roots or claw pumps may be manufactured and assembled in the form of a clamshell. As shown in FIG. 1, the stator 100 of such a pump comprises first and second half-shell stator components 102, 104 which together define a plurality of pumping chambers 106, 108, 110, 112, 114, 116. Each of the half...

Claims

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Application Information

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IPC IPC(8): F04C27/02F04C18/08F04C18/12F04C25/02
CPCF04C27/02F04C25/02F04C2240/10F04C18/126F04C2220/10F04C18/086F01C21/104F04C23/001F04C27/001F04C27/005F01C21/10F04C27/008
InventorHOLBROOK, ALAN ERNEST KINNAIRDTRIKOILIS, NOMIKOS
OwnerEDWARDS LTD