DK168311B1

DK168311B1 - Pressure medium driven hose pump

Info

Publication number: DK168311B1
Application number: DK045087A
Authority: DK
Inventors: Urban Albinsson
Original assignee: Steridose Systems Ab
Priority date: 1986-02-03
Filing date: 1987-01-28
Publication date: 1994-03-07
Also published as: EP0232238A3; DK45087D0; SE8600459L; AU6798887A; NO870350L; FI870408A0; EP0232238B1; EP0232238A2; JPS62191680A; DK45087A; ATE63616T1; DE3770006D1; JP2801001B2; NO870350D0; FI870408A; SE8600459D0

Abstract

A pump device for a flowable product comprising a housing (10) and at least two pair of connection pieces (12, 13) on the housing (10). One connection piece in each pair of pieces forms the inlet means to the chamber (16) and the other the outlet means. One pair of an inlet means and an outlet means are operatively interconnected via a sub-chamber forming, not pressure resistant, resilient, tube-shaped hose (11) in the chamber (16). Truncated, perforated, conical hose connection means (17, 18) are arranged at opposite ends of the elongated housing. Check valves (21, 22) of the flap type are arranged for alternatingly opening and closing the inlet and outlet of each pair of connection pieces. Means (24-27) are arranged for pressurizing the hose (11) either internally or externally for operating the pump such that it pumps the product either through the chamber (16) or through the hose.

Description

i DK 168311 B1in DK 168311 B1

Opfindelsen vedrører en trykmediumdrevet slangepumpe til et strømningsdygtigt produkt omfattende et aflangt hus med mindst to par tilslutninger placeret på huset, hvor hvert par består af en tilgang til og en af-5 gang fra et kammer i huset, og hvor det ene til- og afgangspar anvendes til pumpning af et strømningsdygtigt produkt og står i indbyrdes kommunikerende forbindelse med hinanden via et ikke-trykoptagende, elastisk, slangeformet hylster, som deler kammeret i en produktdel og 10 en trykfluidumdel, og hvor organer er indrettet til skiftevis at åbne og lukke tilgangen og afgangen i hvert par af tilslutninger.The invention relates to a pressure medium driven hose pump for a flowable product comprising an elongated housing with at least two pairs of connections located on the housing, each pair consisting of an access to and exit from a chamber in the housing, and the one pair of inlet and outlet is used for pumping a flowable product and communicates with each other via a non-pressure-absorbing, elastic tubular sleeve which divides the chamber into a product portion and a pressurized fluid portion, and wherein means are arranged to alternately open and close the access and the output of each pair of connections.

Trykluftdrevne pumper med en slangeformet membran mellem et doseringskammer og et arbejdskammer er kendte, 15 fx fra SE fremlæggelsesskrift nr. 412939, (GB offentliggørelsesskrift nr. 2 003 976), DE offentliggørelsesskrift nr. 3 000 142, US patentskrift nr. 3 427 987 og US patentskriftet nr. 2 626 569.Compressed air driven pumps with a hose-shaped diaphragm between a metering chamber and a working chamber are known, e.g. U.S. Patent No. 2,626,569.

De kendte pumper har først og fremmest den ulem-20 pe, at strømningen i doseringskammeret i hovedsagen er laminar, hvilket bevirker slid af produktet på grund af forskydningskræfter, hvilket er et problem når der pumpes blodplasma, i hvilken de skrøbelige blodplader kan beskadiges, og at doseringskammeret ikke tømmes fuld-25 stændigt. yderligere har de en række mangler, idet de ikke har en opbygning, der tillader adskillelse og samling uden værktøj i sterile systemer, ikke tillader sterilisering på stedet og ikke tåler høje tryk og høje temperaturer.The known pumps primarily have the disadvantage that the flow in the dosing chamber is essentially laminar, which causes wear of the product due to shear forces, which is a problem when pumping blood plasma in which the fragile platelets can be damaged, and that the dosing chamber is not completely emptied. further, they have a number of shortcomings in that they do not have a structure that allows separation and assembly without tools in sterile systems, does not allow on-site sterilization, and cannot withstand high pressures and high temperatures.

30 Med henblik på at eliminere nævnte ulemper og mangler tilvejebringes ifølge opfindelsen en trykflui-dumdrevet slangepumpe af den indledningsvis angivne art, der er ejendommelig ved, at der ved modstående ender af det aflange hus er anbragt perforerede, stumpe, koniske 35 slangetilslutningsorganer, hvilke organer danner støtteflader for slangen ved udvendig tryksætning ved hjælp af DK 168311 B1 2 en til tilgangen i det andet par af tilslutninger tilsluttelig trykfluidumkilde.In order to eliminate said drawbacks and shortcomings, according to the invention there is provided a pressurized fluid-driven hose pump of the type indicated initially, characterized in that perforated, blunt, tapered conical hose connection means are provided, which means forms support surfaces for the hose by external pressure setting by means of DK 168311 B1 2 a pressure fluid source connectable to the inlet of the second pair of connections.

Herved opnås, at de perforerede, koniske slangetilslutningsorganer understøtter slangen således, at den 5 klemmes helt flad, når den tryksættes udvendig. Dette har den fordel, at der ikke efterlades et restvolumen i slangen, og at der sker uden at slangen i det væsentlige belastes. De perforerede keglestubbe modvirker effektivt enhver tendens til laminar strømning i slangen. Derved 10 undgås forskydningskræfter og produktet vil ikke lide væsentligt under slid stammende fra indre friktion.This results in the perforated conical hose connection means supporting the hose so that it is squeezed completely flat when pressed externally. This has the advantage that no residual volume is left in the hose and that occurs without substantially straining the hose. The perforated cone stumps effectively counteract any tendency for laminar flow in the hose. Thereby, shear forces are avoided and the product will not suffer significantly from wear resulting from internal friction.

I foretrukne udførelsesformer kan organerne til skiftevis at åbne og lukke tilgangen og afgangen omfatte kontraventiler, og slangen kan være fremstillet af et 15 stærkt elastisk latexmateriale.In preferred embodiments, the means for alternately opening and closing the inlet and outlet may comprise non-return valves and the hose may be made of a highly elastic latex material.

I det følgende forklares opfindelsen nærmere under henvisning til tegningen, som dels i tværsnit, dels i sidebillede ved hjælp af punkterede linier viser en udførelsesform for pumpen ifølge opfindelsen.In the following, the invention is explained in more detail with reference to the drawing, which partly in cross section and partly in side view by means of dotted lines shows an embodiment of the pump according to the invention.

20 Henvisnings tallet 10 betegner et i alt væsent ligt cylindrisk pumpehus, hvori der er arrangeret en slange 11 af et materiale, der er fleksibelt eller elastisk, som tåler høj temperatur og ikke er trykoptagende, dvs. i princippet er elastisk deformerbart, ek-25 sempelvis et stærkt elastisk latexmateriale.Reference numeral 10 denotes a substantially cylindrical pump housing in which is arranged a hose 11 of a material which is flexible or resilient, which can withstand high temperature and is not pressure absorbing, i.e. in principle, elastically deformable, for example, a highly elastic latex material.

Slangen 11 er forbundet på en sådan måde, at den i huset 10 danner et adskillende element i et kammer 16 og tilvejebringer strømningsforbindelse mellem en tilslutning 12 og en tilslutning 13. Disse til-30 slutninger udgør henholdsvis en tilgang og en afgang fra kammeret 16 for det pumpede produkt. På tegningen kan det f.eks. antages, at henvisningstallet 14 betegner tilgangen og henvisningstallet 15 betegner afgangen. Tilgangen og afgangen er i den aktuelle udførelsesform 35 tilvejebragt ved hjælp af perforerede keglestubbe 14a og 15a, der ved hjælp af klemmer 17 og 18 holdes på DK 168311 B1 3 plads i huset 10, hvilke klemmer kan betjenes uden brug af værktøjer i forbindelse med adskillelse og samling af pumpen. Yderligere klemmer 19 og 20 af samme type som førnævnte forbinder rørstykker til huset 10, 5 så der dannes til- og afgangstilslutningsstykker for sterile strømningskredsløb.The hose 11 is connected in such a way that it forms in the housing 10 a separating element in a chamber 16 and provides a flow connection between a connection 12 and a connection 13. These connections respectively constitute an inlet and a departure from the chamber 16 for the pumped product. In the drawing, it can e.g. it is assumed that the reference number 14 denotes the approach and the reference number 15 denotes the exit. In the present embodiment, the inlet and outlet are provided by means of perforated cone stubs 14a and 15a which are held in place by means of clamps 17 and 18 in the housing 10, which clamps can be operated without the use of tools for separation. and assembly of the pump. Further terminals 19 and 20 of the same type as the aforementioned connect pipe pieces to housing 10, 5 to form inlet and outlet connection pieces for sterile flow circuits.

De perforerede keglestubbe 14a og 15a modvirker effektivt enhver tendens til laminar strømning i slangen 11. Derved undgås forskydningskræfter og produktet vil 10 ikke lide væsentligt under slid stammende fra indre friktion. Når slangen 11 trykkes sammen danner det koniske ydre af stykkerne 14a, 15a en understøtning til at klemme slangen helt flad, således at der ikke efterlades et restvolumen, og uden at slangen i det væsentli-15 ge belastes.The perforated cone stumps 14a and 15a effectively counteract any tendency for laminar flow in the hose 11. This avoids shear forces and the product 10 will not suffer substantially from internal friction wear. When the hose 11 is compressed, the tapered exterior of the pieces 14a, 15a forms a support for clamping the hose completely flat so that no residual volume is left and without substantially straining the hose.

I begge ender af huset 10 findes kontraventiler 21 og 22, som eksempelvis kan være af den slags, hvor den ene lukker og den anden åbner, når der tilføres overtryk udvendigt på slangen.At both ends of the housing 10 are check valves 21 and 22, which may, for example, be of the kind where one closes and the other opens when exterior pressure is applied to the hose.

20 Den punkterede linie lla viser et alternativt forløb af slangen 11, der indebærer, at slangens naturlige dimension er noget mindre end pumpehuset 10's tværsnit. På denne måde opdeles kammeret 16 i to kamre 16a og 16b, der allerede i udgangsstilligen hver 25 har et vist nominelt volumen.The dashed line 11a shows an alternate course of the hose 11 which implies that the natural dimension of the hose is somewhat smaller than the cross section of the pump housing 10. In this way, the chamber 16 is divided into two chambers 16a and 16b, which already in the starting position each 25 have a certain nominal volume.

Henvisningstallene 24 og 25 antyder tilgang til eller afgang fra delkammeret 16a eller ydersiden af slangen 11 af trykfluidet, der driver pumpen. Henvisningstallene 26 og 27 angiver kontraventiler, der kan 30 være af den principielt samme slags som kontraventilerne 21 og 22 indrettet således, at den ene af ventilerne er lukket, medens den anden er åben.Reference numerals 24 and 25 indicate access to or exit from the sub-chamber 16a or the outside of the tubing 11 of the pressure fluid driving the pump. Reference numerals 26 and 27 denote non-return valves 30 which may be of the same principle as the non-return valves 21 and 22 so that one of the valves is closed while the other is open.

Så snart trykket på slangen falder til et lavere niveau, antager slangen sin oprindelige form, og produk-35 tet trykkes ind i eller suges ind gennem den tilslutning 12 eller 13, der er valgt som tilgang, medens den anden tilslutning er lukket.As soon as the pressure on the hose drops to a lower level, the hose assumes its original shape and the product is pressed into or sucked in through the connection 12 or 13 selected as the approach, while the other connection is closed.

Claims

As the product flows through the hose 11 and is alternately pressurized and relieved, the product will be caused to pulse through the outlet selected 12 and 13. The pulsating discharge from the pump can be smoothed by parallel coupling a plurality of pumps of the type described and providing them with a suitable phase shift.

A pressurized medium hose pump for a flowable product comprising an elongated housing (10) having at least two pairs of connections (12, 13; 24, 25) located on the housing, each pair comprising an access to and exit from a chamber in the housing and wherein the one supply and exit pair (12, 13) is used for pumping a flowable product and communicates with each other via a non-pressure-absorbing, elastic tubular sleeve (11) which divides the chamber into a product portion and a pressurized fluid portion, and wherein means 35 (21, 22; 26, 27) are arranged to alternately open and close the inlet and outlet of each pair of connections, characterized in that by opposite ends of the elongated housing (10) are provided with perforated, blunt, tapered hose connection means (14a, 15a) which form support surfaces for the hose (11) at 5 external pressure by means of one for the inlet (24, 25 of the second pair). of connections (24, 25) ten Ultimate pressure fluid source.

Pump according to claim 1, characterized in that the means for alternately opening and closing the inlet and outlet comprise non-return valves (21, 22; 26, 27).

Pump according to claim 1, characterized in that the hose (11) is made of a highly elastic latex material. v