SE522138C2

SE522138C2 - Pump

Info

Publication number: SE522138C2
Application number: SE0004085A
Authority: SE
Inventors: Andreas Wahlberg
Original assignee: Octapump Ab
Priority date: 2000-11-08
Filing date: 2000-11-08
Publication date: 2004-01-13
Also published as: JP2004513299A; SE0004085L; AU2002211187A1; EP1332287B1; EP1332287A1; DE60138826D1; ATE432417T1; US20040101426A1; SE0004085D0; WO2002038957A1

Abstract

A pump includes a pump housing (10, 11, 20) that has a circular-cylindrical piston chamber (14), a rotatable and axially movable circular-cylindrical pump piston (40) in said chamber, means (30, 43) for rotationally driving the piston in the chamber, and means (11, 41; 13, 42; 67, 68) for imparting to the piston guided axially reciprocating movement in the piston chamber through the medium of piston rotation, wherein the pump includes lines and valve means for permitting one-way suction and one-way propulsion of pump fluid respectively into and out of the pump chambers between the ends of the piston chamber and the respective adjacent end of the piston. The means for imparting axial reciprocating movement to the piston are adapted to cause the piston to move axially at a constant speed at a constant rotational speed of the piston, at least during the expulsion of pump fluid.

Description

20 25 30 35 522 2138 Fig 1 visar schematiskt en axialsektion genom en pump enligt uppfinningen. Fig. 1 schematically shows an axial section through a pump according to the invention.

Fig 2 visar en sektion tagen utmed linje II - Il i fig 1.Fig. 2 shows a section taken along line II - II in Fig. 1.

Fig 3 visar en sektion tagen utmed linje III - III i fig 1.Fig. 3 shows a section taken along line III - III in Fig. 1.

Fig 4 visar en ändvy av pumpkolvens ena ändyta.Fig. 4 shows an end view of one end surface of the pump piston.

Fig 5 visar en sidovy av ändytan enligt fig 4.Fig. 5 shows a side view of the end surface according to Fig. 4.

Pumpen är i grunden baserad på konstruktionen enligt SE-B- 393441 vars innehåll härmed inkorporeras häri.The pump is basically based on the construction according to SE-B-393441, the contents of which are hereby incorporated herein.

Kolven innefattar en kolvkammare vilken är bildad av en vägg 10 med cirkulärcylindrisk inneryta och två gavelväggar 11, 13.The piston comprises a piston chamber which is formed by a wall 10 with a circular-cylindrical inner surface and two end walls 11, 13.

Pumphuset definierar en kammare 14 för en kolv 40 med cirkulär- cylindrisk yttervägg, som nära angränsar till husets mantel- vägg. Kolven 40 är axiellt förskjutbar och roterbar i kammaren 14. Kolven 40 har väsentligen parallella ändytor 41, 42 som bildar en vinkel mot normalplan till kolvens 40 axel. Husets ändytor 11, 13 är inbördes spegelsymmetriska relativt ett normalplan till husets axel.The pump housing defines a chamber 14 for a piston 40 with a circular-cylindrical outer wall, which closely adjoins the casing wall of the housing. The piston 40 is axially displaceable and rotatable in the chamber 14. The piston 40 has substantially parallel end surfaces 41, 42 which form an angle to the normal plane of the axis of the piston 40. The end surfaces 11, 13 of the housing are mutually mirror-symmetrical relative to a normal plane to the axis of the housing.

Husets ändvägg 13 är bildad av ett lock 20 som är lösbart anslutet till husets vägg 10 exempelvis med bajonettförband 21.The end wall 13 of the housing is formed by a lid 20 which is releasably connected to the wall 10 of the housing, for example with bayonet joints 21.

Locket 20 visas ha en central axiell borrning 22 för en mot- svarande drivningsaxel 30. Borrningen 22 har i sitt till kammaren 14 anslutande del ett koaxiellt cirkulärcylindriskt förstorat parti 23 vilket emottar ett vidgat tätningsparti 31 av axeln 30 samt ett därifrån utgående bladformat axelparti 32 och ett par utskott 48 från kolven, såsom närmare visas på fig 3.The cover 20 is shown having a central axial bore 22 for a corresponding drive shaft 30. The bore 22 has in its part adjoining the chamber 14 a coaxial circular-cylindrically enlarged portion 23 which receives a widened sealing portion 31 of the shaft 30 and a blade-shaped shaft portion 32 and a pair of projections 48 from the piston, as shown in more detail in Fig. 3.

Kolven 40 har två diametralt motsatta urtagningar 44, 45 i sin mantelyta. I pumphuset bildas en pumpkammare 51, 52 vid 10 15 20 25 30 35 5223 158 respektive ände av kolven. En kanal 46 sträcker sig från urtagningen 45 till pumpkammaren 51. En kanal 47 sträcker sig från urtagningen 44 till pumpkammaren 52. Kolven har en centralblind urtagning 43 från sin ändyta 42 för emottagning av axeldelen 32.The piston 40 has two diametrically opposite recesses 44, 45 in its outer surface. In the pump housing, a pump chamber 51, 52 is formed at the respective end of the piston. A channel 46 extends from the recess 45 to the pump chamber 51. A channel 47 extends from the recess 44 to the pump chamber 52. The piston has a central blind recess 43 from its end surface 42 for receiving the shaft portion 32.

Såsom framgår av fig 3 är axeldelen 32 och utskotten 48 utformade för att tillsammans väsentligen utfylla borrningens 23 tvärsnitt. Vidare är utskottens 48 ändar avslutade i ett normalplan till kolven 40, så att borrningen 23 väsentligen fullständigt utfylles av de visade komponenterna. Pumpgaveln 11 och golvänden 41 har väsentligen komplementära ytor, vilket även gäller för ytorna 13, 42.As can be seen from Fig. 3, the shaft part 32 and the projections 48 are designed to together substantially fill the cross section of the bore 23. Furthermore, the ends of the projections 48 are terminated in a normal plane to the piston 40, so that the bore 23 is substantially completely filled by the components shown. The pump end 11 and the floor end 41 have substantially complementary surfaces, which also applies to the surfaces 13, 42.

Fig 2 illustrerar att väggen 10 har två diametralt motstàende anslutningsstudsar 15, 16 för insugning respektive utmatning av en fluid som pumpas. Vidare kan man se att det skivformade kolvpartiet 49 som avgränsar urtagningarna 44, 45 har en ventilfunktion med avseende på ledningarna 15, 16.Fig. 2 illustrates that the wall 10 has two diametrically opposed connection spouts 15, 16 for suction and discharge of a fluid which is pumped, respectively. Furthermore, it can be seen that the disc-shaped piston portion 49 which delimits the recesses 44, 45 has a valve function with respect to the lines 15, 16.

I ett föredraget utförande av uppfinningen är ändytorna ll, 41; 42, 13 väsentligen komplementära. Vidare har ändytorna samver- kande periferier vilka ger kolven en styrd axialrörelse som ger kolven väsentligen konstant förskjutningshastighet vid en kons- tant rotationshastighet. Fördelen härmed är att pumpen levere- rar ett jämt flöde.In a preferred embodiment of the invention, the end surfaces 11, 41; 42, 13 substantially complementary. Furthermore, the end surfaces have cooperating peripheries which give the piston a controlled axial movement which gives the piston a substantially constant displacement speed at a constant rotational speed. The advantage of this is that the pump delivers an even flow.

Det inses att respektive pumpkammare 51, 52 under ena halvan av ett rotationsvarv arbetar som insugningskammare respektive utdrivningskammare, och under andra halvan av rotationsvarvet växlar funktion.It will be appreciated that during one half of a rotational revolution, the respective pump chambers 51, 52 operate as suction chambers and expulsion chambers, respectively, and during the other half of the rotational revolution function changes.

Fig 4 illustrerar en ändvy över kolvänden 41 vars yta S kan anses definieras av punkter Pn. l0 15 20 25 30 35 5224138 På fig 4 och 5 visas ett ortogonalt koordinatsystem där Z-axeln sammanfaller med husets axel och kolvens axel. Ytan S tangerar X-Y-planet.Fig. 4 illustrates an end view of the piston end 41 whose surface S can be considered to be defined by points Pn. 5224138 Figures 4 and 5 show an orthogonal coordinate system where the Z-axis coincides with the axis of the housing and the axis of the piston. Surface S touches the X-Y plane.

Varje punkt Pn definieras av sitt vinkelavstånd a från X i XY- planet, och sitt radiella avstånd a från Z-axeln, samt sin höjd Z över XY-planet. På fig 4 visas kanalen 46. Ytan S är symme- trisk relativt X-Z planet.Each point Pn is defined by its angular distance a from X in the XY plane, and its radial distance a from the Z axis, and its height Z over the XY plane. Fig. 4 shows the channel 46. The surface S is symmetrical relative to the X-Z plane.

Varje punkt Pn (X,Y,Z) definieras av sambanden Xn a cos Q Yn = a sin u Zn a a h r n där variabeln a har gränserna O < a S r och variabeln a har gränserna - n < a S n, varvid kolvens radie kolvens slaglängd konstant.Each point Pn (X, Y, Z) is defined by the relationships Xn a cos Q Yn = a sin u Zn aahrn where the variable a has the limits O <a S r and the variable a has the limits - n <a S n, the radius of the piston being the stroke constant.

Var och en av husytorna ll, l3 och kolvytorna 41, 42 har denna form i det föredragna utförandet.Each of the housing surfaces 11, 13 and the piston surfaces 41, 42 has this shape in the preferred embodiment.

Ytan S är lämpligen avrundad i sitt symmetriplan. Den lilla rundning som krävs för att kolvens accelerationer skall bli ändlig i vändlägena kan anpassas mellan à ena sidan hàllfast- hetskrav och á andra sidan acceptans av fluktuationer för de resulterande flödesfluktuationerna. Pumpen kan användas för pumpning av vätska eller gas och har universell användbarhet.The surface S is suitably rounded in its plane of symmetry. The small rounding required for the accelerations of the piston to be finite in the turning positions can be adjusted between, on the one hand, strength requirements and, on the other hand, acceptance of fluctuations for the resulting flow fluctuations. The pump can be used for pumping liquid or gas and has universal utility.

Den lämpar sig även för pumpning av känsliga fluider.It is also suitable for pumping sensitive fluids.

Pumpens komponenter kan framställas genom formsprutning, med toleranser som undanröjer behovet av speciella tätningar såsom O-ringar och dylikt.The components of the pump can be manufactured by injection molding, with tolerances that eliminate the need for special seals such as O-rings and the like.

Claims

10 15 20 25 30 35 5225158 P A T E N T K R A.V

A pump comprising a pump housing (10, 11, 20) having a circular-cylindrical piston chamber (14), a circularly rotatable and axially displaceable circular-cylindrical pump piston (40), means (30, 43) for rotationally driving the piston in the chamber, each and every one of the end faces (41, 42) of the piston and the respective adjacent end face of the chamber, extends obliquely towards the axis of the chamber and 42) simultaneously running in contact with the respective end face (11 of the chamber), so that the two end faces (41, 13) of the piston whereby the piston (40) experiences a controlled reciprocating movement during the rotational drive of the piston, an inlet line (15) and an outlet line (16) which connect through the chamber wall (10) in two diametrically opposite areas of the piston chamber (14) in a longitudinal center region thereof. , two diametrically opposite recesses (44, 45) in the piston in its longitudinal center region, (46) end face a first channel in the piston between its one recess (41), and a second channel (47) (45) and its one in the piston between its second recess (44) o ch its other end face (42), characterized in that (Xn, Yn, a three-dimensional orthogonal coordinate system X, Y, Z, each of the end faces is defined by points Pn Zn) i wherein Z lies in the axis of the chamber and piston and the end face is tangent to the system XY plane Xn = a cos d Yn = a sin d Zn = adhrn where the variable a indicates the radial distance of the point from the Z axis, and the variable a indicates the angular distance of the point from the XZ plane around ZO <a S r -n <d S n 522 6138 wherein r = radius of the piston h = stroke of the piston n = constant whereby the piston (40) is imparted a substantially constant axial speed between its end positions at constant piston rotation speed.

Pump according to claim 1, characterized by a drive shaft shaft (30) coaxial with the piston extends through a channel (22, 23) through a housing end (20) and has a non-round entraining part (32) which engages in an entraining opening (43). ) at the near end of the piston (40), that the channel (22, 23) has an enlarged portion adjacent to the piston which receives partly a longitudinal section of the non-round entraining part, partly filling bodies (48) arranged on the piston, the entraining part (32) and the filling bodies (48 ) fills the cross section of the widened portion (23).

Pump according to Claim 1 or 2, characterized in that the shaft (30) has a widened part (31) which fills an axially outer part of the widened portion (23) of the duct and in that the filling bodies (48) which are terminated in a normal plane to the remaining part of the piston (40) of the widened portion of the channel, when the adjacent shaft, together with the entraining part (32), fills that pump chamber (52) has minimized volume.