Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B43/00—Machines, pumps, or pumping installations having flexible working members
  • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
  • F04B43/1292—Pumps specially adapted for several tubular flexible members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B43/00—Machines, pumps, or pumping installations having flexible working members
  • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing

Definitions

• the invention relates to a peristaltic pump according to the preamble of claim 1.
• Peristaltic pumps of the type in question are known in principle. They are used to pump a wide variety of liquid or gaseous media.
• a roller pump for peristaltic delivery of media which is provided with a hose cassette.
• the hose cassette is fixed to the roller pump by means of a lockable cover.
• the conveyor rollers are resiliently supported on a rotating body.
• such a roller pump together with the hose cassette has a relatively large length and accordingly requires a lot of space.
• a peristaltic pump is known from WO 02/25112, which is provided with a multi-part housing in which a reduction gear is arranged.
• the pressure tubes for squeezing a flexible hose section are integrated in the reduction gear.
• Such a pump consists of a large number of individual parts, is relatively expensive to manufacture and takes a long time to assemble.
• US Pat. No. 5,857,843 discloses a peristaltic pump which has a support frame on which the rotor is exchangeably mounted.
• the support frame is provided with pawl-shaped locking elements which serve to fix a plate forming the upper housing part.
• the plate is concave on the inside and serves to accommodate a flexible hose section.
• the object of the present invention is to improve a pump designed in accordance with the preamble of claim 1 in such a way that it is compact and can be produced inexpensively, that it can be assembled easily and quickly, and that it is very stable when assembled and has a high degree of shape accuracy. This object is achieved with a pump with the in the characterizing part of the claim
• Figure 1 is an exploded view of the peristaltic pump.
• FIG. 2 shows the assembled pump according to FIG. 1 in a first cross section
• FIG. 3 shows the assembled pump according to FIG. 1 in a further cross section.
• FIG. 1 shows a six-channel peristaltic pump in an exploded view.
• the pump essentially consists of a support frame 1, a hose receptacle 2, a rotor 3 and a connecting element 4 with six hose sections 43 arranged thereon.
• a gearwheel 5 provided for coupling to a drive motor (not shown) is also shown.
• the dimensionally stable support frame 1 forms together with the hose receptacle
• the support frame 1 For the rotatable mounting of the rotor 3, two bearing bushes 11 are arranged on the support frame 1.
• the two end faces of the support frame 1 are formed by plates 12 which are provided with slots 15a, 15b for fixing the support frame 1 or the entire pump.
• the support frame 1 is provided on both sides with a plurality of slot-shaped recesses 13, in which locking elements 22 of the hose receptacle 2 can be clamped, as will be explained in more detail below.
• the hose receptacle 2 has an essentially omega-shaped hose bed body 25 which extends on the inside coaxially to the axis of rotation of the rotor 3 over approximately 130 ° in the form of a circular arc and forms a hose bed.
• omega-shaped means that the tubular bed body 25 essentially has the shape of a large omega ( ⁇ ).
• the tubular bed body 25 forms two legs 2a, 2b, which transition from a concave to a convex shape in a smooth transition.
• the tube bed is divided into six sections by groove-shaped recesses 21, which serve to accommodate the flexible tube sections. Instead of the groove-shaped recesses 21 for - ⁇
• a tube mat consisting of six interconnected tubes could also be used to form six sections.
• the tubular bed body 25 could be provided with a largely smooth inside.
• the two legs 2a, 2b of the tube bed body 25 are provided on the outside with locking elements 22, by means of which the tube receptacle 2 can be fixed to the slot-shaped recesses 13 of the support frame 1.
• Radially extending reinforcing ribs 23 and axially extending reinforcing ribs 24 are provided on the outside of the tubular bed body 25.
• the radially extending reinforcing ribs 23 extend approximately 180 ° over the outside of the tubular bed body 25.
• tubular receptacle 2 is dimensioned such that the two legs 2a, 2b of the tubular bed body 25 are resiliently resilient in the radial direction at the ends, and the tubular receptacle is quickly fixed 2 enable in the sense of a snap connection on the support frame 1.
• the rotor 3 consists of a rotor body 31 which is provided with a central axis 32 which is inserted into the bearing bushes 11 of the support frame 1.
• Three conveyor rollers 33 in the form of rollers are rotatably mounted on the rotor body 31.
• the rotor body 3 is preferably made of plastic, while the central axis 32 and the conveyor rollers 33 are preferably made of metal.
• connection element 4 consists of a base element 41 to which twelve pipe sections 42 are fastened. A total of six flexible hose sections 43 are arranged on the upper parts of these pipe sections 42, which, after the pump has been assembled, put on the inside of the hose bed body 25 and can be squeezed off by the conveyor rollers 33 for the peristaltic conveying of a medium. It goes without saying that the design of the inlet and outlet area is not limited to a six-channel pump, but the number of channels can be varied practically as desired.
• the individual parts shown can be assembled into a pump in a few simple steps, by first fastening the individual hose sections 43 to the connecting element 4 and then inserting the rotor 3 from the side into the hose sections 43 forming the loops. Then the hose holder 2 is set up in a U-shape and the rotor 3, together with the connecting element 4 and the hose sections 43 connected to it, are pushed in from above. The support frame 1 is then placed on and a pressure is exerted so that the axis 32 of the rotor 3 and the latching elements 22 snap into place. Finally, the connection element 4 is fixed on the support frame 1. At the The embodiment shown here is attached to the connecting element 4 by means of screws. Alternatively, a snap connection can be provided to fasten the connection element 4, which enables the connection element 4 to be fastened to the support frame 1 quickly. The entire assembly of the pump can be done from one side and without the aid of tools, which is an advantage in automatic production.
• FIG. 2 shows a first cross section through the assembled pump.
• This illustration shows, in particular, the rotor body 31 together with the three conveyor rollers 33a, 33b, 33c which are rotatably arranged thereon and roll on the respective hose section 43, the hose holder 2 with the omega-shaped hose bed body 25 and the radial and axial reinforcing ribs 23, 24.
• the reinforcing ribs 23, 24 ensure that the hose holder 2 is dimensionally stable and does not deform during operation under the load on the conveyor rollers 33a, 33b, 33c.
• the omega-shaped design of the tubular bed body 25 with a “soft” inlet and outlet area ensures a continuous and low-pulsation peristaltic conveying of the respective medium.
• the soft inlet and outlet is the reduction of torque peaks, which would put a load on the engine and transmission. If a direction of rotation D in the counterclockwise direction is assumed, the area provided with the reference number 35 represents the inlet area, while the area provided with the reference number 36 forms the outlet area of the pump.
• the pump can be operated both clockwise and counterclockwise.
• a soft or continuous inlet and outlet area means that both the inlet area 35 and the outlet area 36 are designed in such a way that the conveying-effective hose cross-section is continuously reduced or enlarged by the conveying roller 33a, 33c rolling on the respective flexible hose section 43. It is important in this context that the tubular bed body 25 is manufactured precisely and has a high degree of dimensional accuracy during operation, so that the predetermined distances between the conveyor roller 33a, 33b, 33c and tubular bed body 25 are maintained.
• a continuous inlet and outlet area 35, 36 results in further advantages, for example by minimizing the torque fluctuations that occur during the rotation of the rotor 3.
• This is additionally favored by the fact that the rotor 3 is provided with three conveyor rollers 33a, 33b, 33c and the inlet area 35 is offset by approximately 240 ° about the axis of rotation of the rotor 3 with respect to the outlet area 36, so that the first conveyor roller 33a is approximately in the middle of the inlet area 35 when the third conveyor roller is 33c is located approximately in the middle of the outlet area 36.
• the design shown also achieves a high degree of efficiency and reduces the mechanical load on the hose sections 43, which increases their service life.
• the pump Since the pump is designed symmetrically, it can also be operated bidirectionally, ie in both directions of rotation. 2 also shows that the respective hose section 43 in the inlet area 35 and in the outlet area 36 is not completely squeezed, while after the inlet area 35 it is completely squeezed out by the corresponding conveying roller 33b and enables peristaltic conveying of the respective medium , A pump designed in this way is also particularly suitable for the cell-friendly conveying of liquid media such as blood, since the blood cells are protected by the specific design of the inlet and outlet areas 35, 36.
• hose receptacle 2 with a dimensionally stable hose bed body 25 and elastically flexible legs 2a, 2b enables a very quick and simple assembly by simply clipping the hose receptacle 2 onto the supporting frame.
• the legs 2a, 2b must be resilient for installation, the tubular bed body 25 must retain a high dimensional stability and a precise geometry after fixing. Among other things, this achieved in that the resiliently flexible parts are positioned and stiffened on the support frame 1 by means of external positive support.
• FIG. 3 which shows the assembled pump in a cross section between two hose sections 43, shows in particular the clamping fixation of the hose bed body 25 on the support frame 1.
• the locking elements 22 arranged on the outside of the tubular bed body 25 engage in the slot-shaped recesses 13 in the support frame 1.
• the latching elements 22 also engage in a form-fitting manner on an upper web 14 of the supporting frame 1 that delimits the slot-shaped recesses 13.
• the legs 2a, 2b of the tubular bed body 25 are positively supported on the outside by the web 14 of the supporting frame 1.
• This design also ensures in particular the precise maintenance of the optimized distances between the conveyor rollers 33a, 33b, 33c and the inside 25a of the tubular bed body 25.
• the individual, elastic tube sections 43 additionally support the fixing of the tube bed body 25 to the support frame 1, since the conveyor rollers 33a, 33b, 33c of the rotor 3 radially extend the tube bed body 25 via the tube sections 43 Load direction so that its fixation on the support frame 1 is additionally supported.
• connection element 4 is designed and matched to the hose receptacle 2 and the rotor 3 in such a way that the individual hose section 43 is guided substantially tangentially into and out of the hose bed body 25 of the hose receptacle 2.
• the tubular bed body 25 must wrap around the rotor 3 at least to such an extent that at least one conveyor roller 33a, 33b 33c is always active, i.e. engages with the respective hose section and squeezes it.
• the minimum wrap or the minimum wrap angle can be calculated as follows:
• the wrap is calculated using the following formula:
• the calculated wrap is to be understood as a minimum dimension.
• the wrap is preferably chosen to be approximately 10 ° larger than the wrap angle calculated according to the preceding formula. Wrapping is to be understood as that part of the hose bed which coaxially encompasses the rotor.
• - It can be single or multi-channel

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Reciprocating Pumps (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=34383944

Family Applications (1)

Country Status (5)

Families Citing this family (12)

Family Cites Families (8)

• 2004
  • 2004-06-25 DE DE502004005771T patent/DE502004005771D1/de not_active Expired - Fee Related
  • 2004-06-25 AT AT04738031T patent/ATE381673T1/de not_active IP Right Cessation
  • 2004-06-25 WO PCT/CH2004/000390 patent/WO2005031166A1/fr active IP Right Grant
  • 2004-06-25 EP EP04738031A patent/EP1680600B1/fr not_active Not-in-force
  • 2004-06-25 US US10/573,287 patent/US20070104599A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events