US 6,547,164 B2Granted

Vapor-liquid ejector with a removable nozzle

AssigneeCompagnie Generale des Matieres Nucleaires

InventorsPierre Miquel, François Poncelet, Philippe Bretault, Didier Michel

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Abstract

The present invention provides a vapor-liquid (V-L) ejector with a removable nozzle (2) in which the internal structure has been modified and improved concerning the clearance that exists to enable said nozzle (2) to be engaged in the body (10) of said ejector (1). The invention also provides a nozzle (2) for such an ejector (1).

Claims22

Dependent claims

A vapor-liquid (V-L) ejector (1) having a body (10) having a recess (14) that receives a removable nozzle (2), said body (10) of said ejector (1) presenting:

a first duct (11) for feeding said nozzle (2) with vapor (V) which constitutes a driving fluid;
a second duct (12) downstream from said first duct (11) along the axis of said nozzle (2) relative to the flow direction of said vapor (V) and serving to introduce the driven liquid (L) into said recess (14) of said body (10);
and
between said first and second ducts (11, 12), an internal shoulder (13) against which a shoulder (3) of the body of said nozzle (2) comes into abutment, sealing means (9) being interposed between the facing surfaces (13′, 3′) of said two shoulders (13, 3) to prevent the driven liquid (L) rising upstream from said sealing means (9);
an interstitial volume (v) inherent to said engagement then existing between the outer surface (4) of the body of said nozzle (2) where it extends downstream from the shoulder (3) of said body of said nozzle (2) and the surface (13″) of the internal shoulder (13) of the body (10) of the ejector (1) facing said outer surface (4) of the body of said nozzle (2), said interstitial volume (v) extending along the axis of said nozzle (2) over a length that goes from the shoulder (3) of said body of said nozzle (2) to the level where the driven liquid (L) is introduced into said body (10) of said ejector (1) via the second duct (12) and giving said driven liquid (L) access to said sealing means (9);
said ejector (1) being characterized in that:
over its entire length extending along the axis of said nozzle (2), said interstitial volume (v) presents a thickness of not less than 2 mm;
and in that
said nozzle (2) has means (20, 20′, 20″) on its outer surface (4) facing said second duct (12) for causing at least a fraction of the flow of driven liquid (L) to be directed upstream towards said sealing means (9) via said interstitial volume (v).

6 more elements

Dependencies are inferred from the claim text.

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Abstract

A vapor-liquid (V-L) ejector (1) having a body (10) having a recess (14) that receives a removable nozzle (2), said body (10) of said ejector (1) presenting:

a first duct (11) for feeding said nozzle (2) with vapor (V) which constitutes a driving fluid;
a second duct (12) downstream from said first duct (11) along the axis of said nozzle (2) relative to the flow direction of said vapor (V) and serving to introduce the driven liquid (L) into said recess (14) of said body (10);
and
between said first and second ducts (11, 12), an internal shoulder (13) against which a shoulder (3) of the body of said nozzle (2) comes into abutment, sealing means (9) being interposed between the facing surfaces (13′, 3′) of said two shoulders (13, 3) to prevent the driven liquid (L) rising upstream from said sealing means (9);
an interstitial volume (v) inherent to said engagement then existing between the outer surface (4) of the body of said nozzle (2) where it extends downstream from the shoulder (3) of said body of said nozzle (2) and the surface (13″) of the internal shoulder (13) of the body (10) of the ejector (1) facing said outer surface (4) of the body of said nozzle (2), said interstitial volume (v) extending along the axis of said nozzle (2) over a length that goes from the shoulder (3) of said body of said nozzle (2) to the level where the driven liquid (L) is introduced into said body (10) of said ejector (1) via the second duct (12) and giving said driven liquid (L) access to said sealing means (9);
said ejector (1) being characterized in that:
over its entire length extending along the axis of said nozzle (2), said interstitial volume (v) presents a thickness of not less than 2 mm;
and in that
said nozzle (2) has means (20, 20′, 20″) on its outer surface (4) facing said second duct (12) for causing at least a fraction of the flow of driven liquid (L) to be directed upstream towards said sealing means (9) via said interstitial volume (v).

6 more elements