SE469190B

SE469190B - PUMP UNIT PROVIDED FOR CORROSIVE MEDIA

Info

Publication number: SE469190B
Application number: SE8701303A
Authority: SE
Inventors: B Blomsten
Original assignee: Scanpump Ab
Priority date: 1987-03-30
Filing date: 1987-03-30
Publication date: 1993-05-24
Also published as: SE8701303D0; DE3809587A1; SE8701303L; FR2613434A1; FR2613434B1

Abstract

A pump unit, which is intended for pumping corrosive fluids, comprises, in part, a submersible pump (1) having a pump housing (5), an impeller (9) situated therein, and a pump-housing cover (8) belonging to the pump housing, the impeller, the pump housing and the pump-housing cover consisting of corrosion-resistant material, and, in part, a motor (2) provided for driving the pump and having a motor casing (14a, 14b), a shaft (11) coupled to the impeller, and cable bushings (20, 21). In order to permit the use of materials which are less expensive and easier to work for as many parts of the pump unit as possible, the unit comprises a casing (24, 24a) which consists of corrosion-resistant material, encloses the said parts belonging to the motor, which are produced from material which is not corrosion-resistant, and whose lower end is connected to the pump-housing cover (8) and whose other, upper end is situated above the highest height of the surface of the corrosive fluid to be pumped (Fig. 1). <IMAGE>

Description

2 fgóåàdfëgiåomma i beröring med det korrosiva pumpmediet, äro utförda av korrosionsfast material. 2 fgóåàdfëgiåomma in contact with the corrosive pumped medium, are made of corrosion-resistant material.

Motorn 2, som här förutsättes vara en elmotor, inne- fattar förutom pumpaxeln ll en motorkåpa l4a, ett till denna 15 resp. 16, ett till kåpan hörande lagerlock 17, lager 18 och 19 hörande införingslock l4b, rotor- och stator samt genomföringar 2O'0d121 för motorns elkablar 23 ellen energi- ti11förSe11edningar_ Aggxgatmïär också försett med en lyft- krok,22. I motsats till vad som konventionellt är fallet vid pumpar för korrosiva medier äro delarna l4a, l4b, 17, 20, 21, 22 och 23 i enlighet med uppfinningen här utförda av ett icke korrosionsfast maærial. Med hänsyn härtill är hela motorn 2, inklusive de ovan nämnda delarna, i enlighet med uppfiningen tätt inneslutna i en mantel 24 av korrosionsfast material, vilken är vätsketätt förbunden med pumphuslocket 8. Manteln 24 sträcker sig så högt upp, att dess övre ände med säkerhet ligger över den högsta nivå 25a (fig.2) som den korrosiva vätäæms Wm kan uppnå. Ett normalvärde på vätskenivån antydes-medelst lin- jen 25 i fig. 1.The motor 2, which here is assumed to be an electric motor, comprises in addition to the pump shaft 11 a motor housing 14a, one to this 15 resp. 16, a bearing cover 17 belonging to the cover, bearings 18 and 19 belonging to the insertion cap 14b, rotor and stator as well as bushings 2O'0d121 for the motor electrical cables 23 or energy for the wires_Aggxgatmïär also provided with a lifting hook, 22. In contrast to what is conventionally the case with pumps for corrosive media, the parts 14a, 14b, 17, 20, 21, 22 and 23 in accordance with the invention here are made of a non-corrosion-resistant material. In view of this, the whole motor 2, including the above-mentioned parts, according to the invention is tightly enclosed in a jacket 24 of corrosion-resistant material, which is liquid-tightly connected to the pump housing cover 8. The jacket 24 extends so high that its upper end securely is above the highest level 25a (Fig. 2) that the corrosive hydrogen Wm can reach. A normal value at the liquid level is indicated by the line 25 in Fig. 1.

Kammare för olja eller annan värmeöverförande, isolerande smörjande och/eller kylande vätska betecknas med 26a, 26b och 26c i fig. 1. Åtminstone kamrarna 26a och-26b ocheventuellt även -' kammaren 26c kommunicera med varandra, såsom framgår av fig. l.Chambers for oil or other heat transfer, insulating lubricating and / or cooling liquid are designated by 26a, 26b and 26c in Fig. 1. At least the chambers 26a and -26b and possibly also the chamber 26c communicate with each other, as shown in Fig. 1.

I det sistnämnda fallet kan, om så befinnes lämpligt, det värmeöverförande mediet tvångscirkuleras geno m kamrarna, vars mellersta del 26a är innesluten mellan motorkåpan 14a och den av korrosionsfast material bestående skyddsmanteln 24.In the latter case, if appropriate, the heat transfer medium may be forcibly circulated through the chambers, the middle part 26a of which is enclosed between the motor housing 14a and the corrosion-resistant protective jacket 24.

Mellan olika delar av pumpaggregatet äro tätningar anbragta, där så erfordras.Seals are fitted between different parts of the pump set, where required.

I fig. 2, i vilken samma hänvisningsbeteckningar som i fig. 1 användas för att beteckna samma eller analoga detaljer, visas ett i enlighet med uppfinningen utfört pumpaggregat vara anbragt i en tank 28 eller dylikt. De högsta och lägsta nivå- erna för vätskeytan i tanken 28 i fig. 2 betecknas med 25a resp. 25b. Manteln 24 i fig. 2 är medelst ett flänsförband förbunden med en förlängningsmantel 24a, som också består av korrosions- fast material och vars övre ände ligger ovanför den högsta möjliga vätskenivån 25a. Enligt fig. 2 är förlängningsmanteln 24a i sin tur förbunden med en skarvmantel 29, vars övre ände i likhet med tryckledningens 6 övre ände är infäst i ett lock 30, -i v ,w-¿, _ 3 _ 11/0 4011 som täcker en öppning i tanken 28. Hela pumpaggrégâtét 1/*J 1, 2 inklusive mantlar 24, 24a och 29 samt tryckledning 6 hänger sålunda i locket 30 samt är uppburet av och upplyft- bart tillsammans med detta. Foten 4 i fig. 1 saknas i fig. 2.In Fig. 2, in which the same reference numerals as in Fig. 1 are used to denote the same or analogous details, a pump assembly made in accordance with the invention is shown to be arranged in a tank 28 or the like. The highest and lowest levels of the liquid surface in the tank 28 in Fig. 2 are denoted by 25a and 25a, respectively. 25b. The jacket 24 in Fig. 2 is connected by means of a flange connection to an extension jacket 24a, which also consists of corrosion-solid material and whose upper end is above the highest possible liquid level 25a. According to Fig. 2, the extension jacket 24a is in turn connected to a splice jacket 29, the upper end of which, like the upper end of the pressure line 6, is fixed in a cover 30, -iv, w-¿, _ 3 _ 11/0 4011 which covers a opening in the tank 28. The entire pump unit 1 / * J 1, 2 including jackets 24, 24a and 29 and pressure line 6 thus hang in the lid 30 and are supported by and liftable together with it. The foot 4 in Fig. 1 is missing in Fig. 2.

Den ovan beskrivna och på ritningarna visade utförings- formen är givetvis att betrakta blott såsom icke begränsande exempel och kan till sina detaljer modifieras på flera sätt inom ramen för följande patentkrav. Sålunda kan exempelvis skarvmanteln 29 och/eller locket 30 utelämnas i vissa fall.The embodiment described above and shown in the drawings is of course to be considered only as a non-limiting example and can be modified in its details in several ways within the scope of the following claims. Thus, for example, the splice jacket 29 and / or the cover 30 can be omitted in some cases.

Då skarvmanteln 29 saknas, kan förlängningsmanteln 24a sträcka sig ända upp till och vara fäst i locket 30a.When the splice jacket 29 is missing, the extension jacket 24a can extend all the way up to and be attached to the cover 30a.

Claims

469 190 y PATENTKRAV

1.) Pump unit, which is intended for pumping corrosive media and which comprises on the one hand a submersible pump (1) with a pump housing (5), an impeller (9) located therein, a pump housing cover (8) belonging to the pump housing and possibly an intermediate the pump housing (5) and the pump housing cover (8) are located and these interconnecting intermediate ring (7), the impeller, the pump housing, the pump housing cover and the possible intermediate ring consisting of corrosion-resistant material, partly an electric motor (2) arranged for driving the pump with a motor cover (14a, 14b), a shaft (11) coupled to the impeller and cable glands (20, 21) or the like for supplying energy to the motor and preferably also a lifting hook (22), characterized in that said motor-belonging parts are made of non-corrosion-solid material and enclosed in a sheath (24, 24a) consisting of corrosion-solid material, one lower end of which is connected in a liquid-tight manner to the pump housing cover (8), the intermediate ring (7) or the pump housing (5) and whose other, upper end is located above the maximum level (25a) of the surface of the corrosive pump medium.

2.) Pump unit according to claim 1, characterized in that the motor cover (14a, 14b) and the sheath (24) consisting of corrosion-resistant material form outer resp. inner wall of a water or other heat transfer medium containing chamber (26a).

3. A pump assembly according to claim 1 or 2, characterized in that the upper end of the jacket (24a), located above the corrosive medium, is connected to a splice jacket (29) consisting of non-corrosion-resistant material.

Pump assembly according to one of the preceding claims, characterized in that the upper end of the corrosion-solid jacket (24, 24a) or the splice jacket (29) is fastened in a lid (30) to a tank. (28) or the like, which contains the corrosive pumping medium, and that the pump assembly (1, 2) can be lifted out of the tank together with the jacket (2¿, (24, 24a, 29) and the tank cap (30). 24a) or the jackets according to