EP0298442A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A pump and a method of separating gas by such from a fluid to be pumped
Assignee: Ahlstrom Corp
•
Filing: 1988-07-06
•
Granted: —
•
Expires: 2008-07-06
Abstract
Abstract The present invention relates to a centrifugal pump and a method of separating gas from solids-containing fluid which is to be pumped, in which the gas discharge passage, from the front of the impeller (6) to the gas discharge duct (8) is provided with a screen surface (13) which surface enables discharging of the gas without any solids being carried to the gas discharge system.
Inventors
- 👤 Toivo Niskanen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 15:24
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/70; F04D29/708; F04D9/00; F04D9/001; F04D9/002; F04D9/003
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
63 words
A pump, mainly comprising a casing (1) with an inlet (2) and with an outlet opening (3), one or more shafts (5) and one or more rotors (6) attached to said shaft/shafts (5), characterized in that one or more screen surfaces (13, 20, 30, 40, 50) have been arranged in connection with the pump to separate gas from the fluid to be pumped.
Claim 2
Dependent Claim
63 words
A pump, mainly comprising a casing (1) with an inlet (2) and with an outlet opening (3), one or more shafts (5) and one or more rotors (6) attached to said shaft/shafts (5), characterized in that one or more screen surfaces (13, 20, 30, 40, 50) have been arranged in connection with the pump to separate gas from the fluid to be pumped.
Claim 3
Dependent Claim
15 words
A pump as claimed in claim 1, characterized in that it is a centrifugal pump.
Claim 4
Dependent Claim
76 words
A pump as claimed in claim 2, the impeller (6) of which is provided with openings (10) for leading gas to the back side of the impeller (6) and the body (4) of which is provided with a gas discharge duct (8), characterized in that the gas discharge passages, from the front side of the impeller (6) to the gas discharge duct (8), are provided with at least one screen surface (13, 20, 30, 40, 50).
Claim 5
Dependent Claim
29 words
A pump as claimed in claim 3, characterized in that the openings (10) of the impeller (6) are so small in size that they themselves form a screen surface.
Claim 6
Dependent Claim
39 words
A pump as claimed in claim 3, characterized in that the screen surface (13, 20, 30, 40) is arranged in the back wall of the pump, between the gas discharge duct (8) and the space (11) behind the impeller.
Claim 7
Dependent Claim
28 words
A pump as claimed in claim 3, characterized in that the screen surface (40) protrudes from the back wall of the pump casing axially towards the impeller (6).
Claim 8
Dependent Claim
52 words
A pump as claimed in claims 5 and 6, characterized in that the back side of the impeller (6) is provided with vanes (12) which transfer solids and fluid, which enter the back side of the impeller (6), outwards at the same time keeping the screen surface (13, 20, 30, 40) clean.
Claim 9
Dependent Claim
44 words
A pump as claimed in claim 5 or 6, characterized in that the screen surfaces (13, 20, 30, 40) are grooved on their sides facing the vanes (12) and that the perforations (21, 31) at least partly are disposed in the grooves (22, 32).
Claim 10
Dependent Claim
44 words
A pump as claimed in claim 1, characterized in that, in the inlet opening (2) of the pump, in front of the impeller (6) is disposed a member (50) provided with a screen surface through which member the gas is discharged from the pump.
Claim 11
Dependent Claim
48 words
A pump as claimed in claim 2, characterized in that the member (50) is disposed in the inlet opening (2) of the pump, inside a rotor (53) in the vicinity of the rotor surface so that the blades of the rotor (53) keep the screen surface (50) clear.
Claim 12
Dependent Claim
42 words
A pump as claimed in claim 2, characterized in that the screen surface is attached to the back vanes (12) of the impeller (6) on the vane edges opposite to the impeller or on the vane edges nearest to the shaft (5).
Claim 13
Dependent Claim
60 words
A pump as claimed in claim 11, characterized in that the body (4) of the pump is provided with members disposed close to the screen surface, which members give pressure pulses through the screen surface and said pulses loosen the solids stuck to the perforations, slots or pores of the screen surface, thus preventing the screen surface from becoming clogged.
Claim 14
Dependent Claim
55 words
A pump as claimed in claim 2, characterized in that the shaft (5) of the pump, on the gas discharge passage after the screen surface (13, 20, 30, 40, 50), is provided with a vacuum pump for leading the gas through the screen plate (13, 20, 30, 40, 50) to the gas discharge duct (8).
Claim 15
Dependent Claim
31 words
A pump as claimed in claim 1, characterized in that the screen surfaces (13,20,30,40,50) are arranged on the rotor surface/surfaces of the pump or on the shaft surface/surfaces of the pump.
Claim 16
Independent Claim
67 words
A method of separating gas from a fluid, which fluid is to be pumped and which contains solids, characterized in that the flow, formed of the gas which is separated during the pumping of the fluid and of other substance being carried with said gas, is led to a separation process, in which process solids are separated from said flow, whereby the gas will become separately dischargeable.
Claim 17
Independent Claim
67 words
A method of separating gas from a fluid, which fluid is to be pumped and which contains solids, characterized in that the flow, formed of the gas which is separated during the pumping of the fluid and of other substance being carried with said gas, is led to a separation process, in which process solids are separated from said flow, whereby the gas will become separately dischargeable.
Claim 18
Dependent Claim
19 words
A method as claimed in claim 15, characterized in that the separated solids are returned to the main flow.
Claim 19
Dependent Claim
33 words
A method as claimed in claim 15, characterized in that the separation of gas from the flow containing gas and other substances is effected by means of integrated equipment of the pumping apparatus.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.