PL228700B3 - Multistage high pressure vortex pump - Google Patents

Abstract

The subject of the invention is an improvement of a multi-stage high-pressure centrifugal pump according to patent PL 217957. The rear disc (1) of the last impeller (2) of the pump on the outer side has coaxial circumferential projections (3) and circumferential grooves (4), and the pump discharge housing on the side of the impeller (2) disc (1) is closed with a front disc (5) with external circumferential projections (3) and circumferential grooves (4), and at least one circumferential projection (3) or circumferential groove (4) of the rear disc (1) of the impeller (2) and/or the front disc (5) of the discharge housing has a circumferential recess (6) dividing a defined gap into two parts.

Description

(12) PATENT DESCRIPTION ₍ i ₉₎ PL ₍ n) 228700 (13) B3 (21) Application number: 411952 (51) Int.CI.

F04D 29/041 (2006.01) (22) Application date: 13/04/2015 F04D 29/051 (2006.01) (61) Additional patent to the patent:

217957 (54)

High-pressure multi-stage centrifugal pump (73) Authorized by the patent:

(43) Application was announced:

24.10.2016 BUP 22/16

ZAKŁAD MECHANIKI PRZEMYSŁOWEJ ZAMEP SPÓŁKA Z OGRANICZONĄ ODPOWIEDZIALNOŚCIĄ, Gliwice, PL (45) The following was announced about granting the patent:

30/04/2018 WUP 04/18 (72) Inventor (s):

KAZIMIERZ GOLEC, Gliwice, PL STANISŁAW WILK, Gliwice, PL ANDRZEJ WILK, Gliwice, PL

CO rco

CM

CM

Q_ (74) Representative:

thing, pat. Karol Nowak

PL 228 700 B3

Description of the invention

The object of the invention is to improve the centrifugal multistage high pressure pump according to the patent PL 217957.

From the patent PL 217957, a multi-stage high-pressure centrifugal pump with an axial thrust balancing unit by means of a relieving disc is known, having on the outer surface of the rear rotor disc of the last stage, coaxial projections and grooves, as well as circumferential coaxial grooves and projections, a rear exchangeable wall of the pressure pump housing, the projections and the grooves of the rotor disc and the casing disc mutually axially inserted form a multi-slot channel through which the liquid from the pressure space flows under the relieving disc through the radial gap between the throttling sleeve embedded in the pressure casing and the protective sleeve mounted on the shaft.

The multi-gap shape of the channel downstream of the last stage impeller reduces the pressure height at the inlet to the radial gap between the sleeves, and thus reduces the volumetric loss in the axial thrust device.

The high-pressure centrifugal pump according to the invention, which is an improvement on the pump according to the patent PL 217957, has circumferential recesses in the projections or in the grooves of the rear disc of the last stage rotor and / or the rear disc of the pressure hull, dividing the slots of the multi-gap seal into two parts. This doubles the number of seal gaps. Since the task of the multi-gap seal downstream of the last impeller is to reduce the inlet pressure to the radial gap between the throttling sleeve embedded in the pressure housing and the protective sleeve mounted on the shaft, circumferential recesses on the projections or grooves of the rear rotor disk and the rear disk of the pressure housing increase the pressure losses at the inlet to the pressure housing. a radial gap between the sleeve of the pressure housing and the sleeve on the shaft, thereby reducing the pressure at the inlet to this gap. This reduces the volumetric loss in the axial pressure relief system by means of a relieving disc.

It is also possible to reduce the number of circumferential projections and grooves in the rear rotor disk and the rear disk of the pressure hull, providing the same result as with projections and grooves without circumferential recesses.

The high-pressure multistage centrifugal pump according to the invention is shown in the accompanying drawing, in which Fig. 1 shows an axial section of a part of the pump and Fig. 2 shows detail A in Fig. 1.

The rear disk 1 of the last rotor 2 of the pump has, from the outside, coaxial circumferential projections 3 and circumferential grooves 4, and the discharge pump housing from the side of the disk 1 of the impeller 2 is closed by a front disk 5 with external circumferential projections 3 and circumferential grooves 4, and at least on one the circumferential projection 3 or circumferential groove 4 of the rear disk 1 of the rotor 2 and / or the front disk 5 of the pressure hull has a circumferential recess 6 dividing a defined slot 7 into two parts.

In a variant, a disc with projections 3 and grooves 4 and recesses 6 is attached to the rear disc 1 of the rotor 2.

The circumferential recesses 6 on the projections 3 or grooves 4 of the rear disk 1 of the impeller 2 or the rear disk 5 of the pressure housing increase the pressure loss at the inlet to the radial gap between the sleeve 8 of the discharge housing and the protective sleeve 9 on the shaft 10, thus lowering the inlet pressure to this rift.

This reduces the volumetric loss in the axial pressure relief system by means of a relieving disc.

Claims (1)

1. Centrifugal, multi-stage high-pressure pump with an axial thrust relief unit by means of a relief disc mounted on the shaft, and the space behind the rear disc of the last rotor and the replaceable front disc of the pressure body is shaped into a multi-slot channel formed by coaxial circumferential projections and circumferential grooves on the rear disc on the side on the outer side of the last rotor and the circumferential projections and circumferential grooves on the outside have a front disk of the pressing hull overlapping one another, according to the patent PL 228 700 B3