EP0267445A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multistage pump for submersible electric pumps
Assignee: Gruppo Industriale Ercole Marelli SpA
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Filing: 1987-10-13
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Granted: —
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Expires: 2007-10-13
Abstract
Abstract A multistage pump for submersible electric pumps is described in which the axial anchoring and the centering of the stage body assembly are achieved by means of anchoring and centering elements consisting of projections (12a, 12c) provided in the outer casing (1) of the pump. This allows a more solid and economical construction and a simplification of the assembly and disassembly of the pump, with a reduction of the number of inner structural locking elements. The floating-ring (24) sealing construction of the stage bodies (2) allows an improvement of the sealing effect and of the hydraulic performance.
Inventors
- 👤 Lucio Mapelli
- 👤 Luigi Assi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 02:01
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/08; F04D13/10; F04D29/00; F04D29/60; F04D29/62; F04D29/628; F05; F05D; F05D2260/00; F05D2260/30; F05D2260/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
217 words
Multistage pump for submersible electric pumps with an external tubular casing (1) containing a plurality of stage bodies (2) axially stacked atop one another within the outer casing, each stage body (2) comprising an impeller (3), a diffuser (4), and a diffuser cover (5), characterized in that the assembly consisting of a plurality of stacked stage bodies (2) is interposed between a pressure chamber (6), arranged on the delivery side, and a locking plate (7) and a suction chamber (8), both arranged on the suction side, in that the outer casing (1) is provided with a plurality of elements for axial anchoring and centering (12a, 12c) consisting of abutment and centering elements or projections, protruding radially towards the interior thereof and circumferentially spaced with respect to one another along at least two circumferences spaced axially along the outer casing (1) and engaging in corresponding peripheral notches provided respectively in the pressure chamber (6) and in the locking plate (7) and in that the suction chamber (8) is connected to the locking plate (7) by means of fixing bolts (13), and is provided with pressure fingers (14) which pass through corresponding openings in the locking plate (7) so as to press on the stage body assembly in an adjustable manner depending on the tightness of the fixing bolts.
Claim 2
Dependent Claim
217 words
Multistage pump for submersible electric pumps with an external tubular casing (1) containing a plurality of stage bodies (2) axially stacked atop one another within the outer casing, each stage body (2) comprising an impeller (3), a diffuser (4), and a diffuser cover (5), characterized in that the assembly consisting of a plurality of stacked stage bodies (2) is interposed between a pressure chamber (6), arranged on the delivery side, and a locking plate (7) and a suction chamber (8), both arranged on the suction side, in that the outer casing (1) is provided with a plurality of elements for axial anchoring and centering (12a, 12c) consisting of abutment and centering elements or projections, protruding radially towards the interior thereof and circumferentially spaced with respect to one another along at least two circumferences spaced axially along the outer casing (1) and engaging in corresponding peripheral notches provided respectively in the pressure chamber (6) and in the locking plate (7) and in that the suction chamber (8) is connected to the locking plate (7) by means of fixing bolts (13), and is provided with pressure fingers (14) which pass through corresponding openings in the locking plate (7) so as to press on the stage body assembly in an adjustable manner depending on the tightness of the fixing bolts.
Claim 3
Dependent Claim
51 words
Multistage pump according to claim 1, charac terized in that at least one further group of said abutment and centering elements, or projections, is furthermore provided in the outer casing (1), and is arranged on at least one circumference which is axially intermediate, acting only radially with a centering function (12b).
Claim 4
Dependent Claim
30 words
Multistage pump according to claim 1 or 2, characterized in that the abutment and centering elements or projections (12a, 12b, 12c) are provided in the outer casing (1) by punching.
Claim 5
Dependent Claim
38 words
Multistage pump according to one of the preceding claims, characterized in that the joint between the diffuser (4) and the diffuser cover (5) in each of the stage bodies (2) is sealed, containing the impeller in its interior.
Claim 6
Dependent Claim
68 words
Multistage pump according to claim 4, characterized in that the diffuser cover (5) consists of two substantially annular parts (21, 22) sealed to one another, within which is enclosed a ring (24) which freely floats in an interspace (23) formed between said two parts, the ring (24) being provided in its inner perimeter with an axial ring (25) which can be matingly coupled over the impeller inlet (3).
Claim 7
Dependent Claim
39 words
Multistage pump according to claims 4 and 5, characterized in that the seal between the diffuser (4) and the diffuser cover (5) and between the two parts (21, 22) of the diffuser cover (5) is achieved by ultrasonic welding.
Claim 8
Dependent Claim
39 words
Multistage pump according to claims 4 and 5, characterized in that the seal between the diffuser (4) and the diffuser cover (5) and between the two parts (21, 22) of the diffuser cover (5) is achieved by electric welding.
Claim 9
Dependent Claim
40 words
Multistage pump according to one of the preceding claims, characterized in that the suction chamber (8) with pressure fingers (14) performs the double function of compression of the stage body assembly (2) and of spider for connection to the motor.
References Cited (Backward Citations)
No citation records indexed.
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