EP0130374B1 - Schlauchpumpe - Google Patents

Schlauchpumpe Download PDF

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Publication number
EP0130374B1
EP0130374B1 EP84106168A EP84106168A EP0130374B1 EP 0130374 B1 EP0130374 B1 EP 0130374B1 EP 84106168 A EP84106168 A EP 84106168A EP 84106168 A EP84106168 A EP 84106168A EP 0130374 B1 EP0130374 B1 EP 0130374B1
Authority
EP
European Patent Office
Prior art keywords
hose
rotor
pump
dividing member
suction chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84106168A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0130374A3 (en
EP0130374A2 (de
Inventor
Manfred Streicher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crane Process Flow Technologies GmbH
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT84106168T priority Critical patent/ATE22159T1/de
Publication of EP0130374A2 publication Critical patent/EP0130374A2/de
Publication of EP0130374A3 publication Critical patent/EP0130374A3/de
Application granted granted Critical
Publication of EP0130374B1 publication Critical patent/EP0130374B1/de
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to a peristaltic pump in which a rotor rotates in the interior of a housing in the direction from a suction chamber to a pressure chamber and presses on a hose laid between a suction nozzle and a pressure nozzle along a peripheral wall of the housing.
  • a peristaltic pump with a housing with a peripheral wall, which is circular cylindrical at least in a pump section, which connects a suction chamber with a pressure chamber in the housing, a flat rear end wall, the housing on its back closes, a flat front wall, which closes the front of the housing, a suction nozzle through which the fluid to be pumped is sucked into the suction chamber, and a pressure nozzle through which the fluid is pressed out of the pressure chamber, a rotor which is located in the interior of the Rotates housing in the direction from the suction chamber to the pressure chamber, the rotor axis of which coincides with the cylinder axis of the pump section and which has at least one squeeze body with the squeezer body axis parallel to the rotor axis, a band-shaped, essentially length-stable separating part which is placed around the rotor and on the front wall and the abuts the rear bulkhead, a hose between the suction T
  • a squeeze body of the rotor does not press directly on the hose, but rather via the interposed band-shaped separating part.
  • the liquid serves to lubricate the pump parts, in particular also the separating part, which lies tightly against the front wall and the rear end wall over its entire circumference.
  • the pumping process takes place in that liquid is pressed out of the hose by squeezing it together.
  • New liquid is supplied in that the hose has its own resilience, which is reinforced by a spring, so that its interior widens again after being squeezed together, as a result of which liquid is sucked in.
  • a similarly constructed pump is known, in which, however, the separating part is not in contact with walls and is also not lubricated by a liquid. However, the separating part is fastened between the pressure and suction nozzle outside the outermost rotor circumference, which has the advantage that the separating part does not slip and thus does not exert any frictional forces on the hose.
  • the invention has for its object to provide a peristaltic pump which has a simple structure and in which the pumping process is supported by vacuum.
  • the invention is given by the features of the main claim. It is characterized in that, in a pump of the type mentioned at the outset, the separating part has such a width, at least in its suction chamber section, that when the rotor rotates, it is sealed off from the rear end wall and the front wall at least with its suction chamber section by the liquid mentioned is pushed, and in the interior between the pressure chamber and suction chamber fixed to a fastening part. is attached outside the outermost rotor circumference, which separates the suction chamber from the pressure chamber, and the hose essentially does not have its own resilience.
  • the pump according to the invention is therefore a vacuum-assisted peristaltic pump which generates the vacuum required for drawing in the liquid to be pumped.
  • a particular advantage is that the vacuum is only generated in the suction chamber, but not in the pressure chamber. In the pressure chamber, the squeeze bodies do not need to squeeze the hose against a negative pressure force.
  • a vacuum-assisted peristaltic pump that generates its own vacuum is also known from FR-A-1 394 047.
  • the suction chamber is connected to the interior of the housing via an adjusting valve, with the aid of which the extent of the negative pressure in the interior of the housing can be adjusted. Since the entire interior of the housing is evacuated, the negative pressure also acts in the pressure chamber, so that when the liquid is squeezed out of the hose, the squeeze bodies have to compress the hose in the pressure chamber against the force of the negative pressure.
  • a pump according to the invention for a delivery rate of about 30,000 l / h weighs only about 30 kg, while a conventional peristaltic pump with an additional vacuum pump weighs about five times for the same delivery rate.
  • the pump runs at around 400 rpm, while a conventional vacuum-assisted pump runs at around 30-100 rpm. running.
  • the lighter design and the higher running speed result from the fact that, in the pump according to the invention, vacuum is only generated in the suction space, but not also in the pressure space.
  • the rotor and the bearing for the rotor and thus the entire housing can therefore be made lighter.
  • the peristaltic pump 30 of the exemplary embodiment according to FIGS. 1-3 has, as main components, a housing 31 and in the interior of which a delivery hose 32, a runner 33 and a separating part 34.
  • the housing 31 has approximately the shape of a cylindrical disk with a rear end wall 35, a front wall formed from a front end wall 36 and a cover 43 and a peripheral wall 37, through which walls an interior 38 is enclosed.
  • the upper section of the circumferential wall 37 is flat, and two nozzles are inserted into this section, of which the left one is called the suction nozzle 45 and the right one is called the pressure nozzle 46.
  • Which spigot acts as a suction spigot and which acts as a pressure spigot depends on the direction of rotation of the rotor 33.
  • the hose 32 is fastened to the two connecting pieces 45 and 46 with hose clamps 47 so that they can be replaced easily.
  • the hose 32 is laid along the peripheral wall 37.
  • the rotor 33 is mounted in a bearing housing 39 which is connected to the rear end wall 35.
  • the bearing housing can also be missing if the rotor is placed directly on the shaft of a drive motor.
  • the rotor 33 is triangular, each with a pair of rollers 52 at the corner points.
  • the separating part 34 is placed, which is firmly connected to the housing 31 in that it is stretched between a fastening rib 53 on the housing and a clamping body 55 which can be tightened by a clamping screw 57.
  • the clamping body 55 is rounded so that it cannot kink even when it moves back and forth.
  • the width of the separating part 34 is selected such that it bridges the distance between the rear end wall 35 and the cover 43.
  • the separating part 34 is band-shaped and essentially stable in length.
  • An elastic pad 48 is applied to the pump section of the peripheral wall 37.
  • the thickness of the support 48 is dimensioned such that the hose 32 is then pushed completely between the separating part 34 and the support 48 when a pair of rollers 52 runs inside the separating part 34 along the pump section.
  • a barrier liquid (not shown) is present in the interior of the housing, in particular in the space enclosed by the separating part 34. This is filled through a filler hole with filler screw 87 in the cover 43 until the liquid escapes at the location of a screwed-out control screw 88 in the middle of the cover. Then the control screw 88 and the filler screw 87 are screwed in again.
  • FIGS. 4.1-4.4 The function of the pump according to FIGS. 1-3 is now explained in more detail using the flow diagrams according to FIGS. 4.1-4.4. It is assumed that the rotor 33 rotates counterclockwise, that is to say in the direction of the arrow 64 in FIG. 1. In the position shown in FIG. 4.1, the runner has rotated so far that one of its pairs of rollers 52, which will be referred to as the first pair 52.1 in the following, just squeezes the hose part originating from the suction port 45 completely. A part of the interior 38 is then separated by the housing walls and the separating part 34, which is referred to below as the suction space 38.1. A suction chamber 63.1 is formed in the hose 34 between the suction nozzle and the squeezing point.
  • the hose 32 is squeezed off at a further point by the pair of rollers 52.2 following in the direction of rotation.
  • the chamber enclosed by the hose between this second squeezing point and the pressure port 46 is referred to below as the pressure chamber 63.2.
  • the space surrounded by the housing walls and the separating part 34, which is in communication with the ambient air via a ventilation opening 93 in the flat section of the peripheral wall 37, is referred to below as the pressure space 38.2.
  • the volume enclosed by the hose between the first pair of rollers 52.1 and the second pair 52.2 is referred to as the intermediate chamber 63.3. The volume of this intermediate chamber remains unchanged when the rotor is turned.
  • the volume of the suction space 38.1 has increased. Since this space is sealed off by the housing walls and the separating part 34, a negative pressure has developed in it. This negative pressure leads to the substantially flaccid hose 32 being blown up by the advancing fluid, thus increasing the volume of the suction chamber 63.1. At the same time, the volume of the pressure chamber 63.2 has decreased due to the second pair of rollers 52.2 rolling along the peripheral wall in the direction of the pressure port 46. The pump has therefore sucked in fluid 45 via the suction nozzle and dispensed fluid 46 via the pressure nozzle.
  • the hose pump 30 thus acts like a conventional hose pump, in which fluid is pressed out of a hose by a squeeze body.
  • the pump 30 functions in such a way that, with the help of the separating part 34, it forms a suction space 38.1 that increases when the rotor 33 rotates, in which the pressure drops further and further, so that it finally becomes lower than the pressure in the suction chamber 63.1 of the delivery hose 32, whereby fluid to be pumped is pressed into the suction chamber 63.1.
  • the vacuum-tight seal between the separating part 34 and the rear end wall 35 and the cover 43 is essential, for which purpose the sealing liquid mentioned at the beginning inside the separating part 34 is used.
  • this barrier liquid is partially sucked into the suction space 38.1 and reaches the pressure space 38.2 when the rotor 33 is rotated. So that the barrier liquid then returns to the space enclosed by the separating part 34, the pump 30 has a transfer opening 85 in the housing cover in the area of the pressure chamber 38.2, a further transfer opening 86 in the middle of the cover and a transfer channel 81 connecting the two openings.
  • Wing-shaped ribs 78 are provided on the rotor 33, which inject the reintroduced barrier liquid onto the inside of the separating part 34 so that the barrier liquid can again perform its sealing function there.
  • the sealing liquid is drained by opening the cover 43 by removing screws 89, the hose clamps 47 are loosened, the worn hose is removed, and then a new hose is attached in the reverse order.
  • the cover can then be replaced with a 90 ° offset if the pump is to be used in a different direction of rotation, i.e. clockwise.
  • By turning the cover it is ensured that the transfer channel 81 again establishes the connection between the pressure space 38.2 and the middle space.
  • the rotated position is shown in dash-dot lines in FIG. 3, as are the directions of the pumped fluid in dash-dot lines.
  • the conveyor hose 32 is, for. B. a normal plastic hose. But he can also by. a stable textile outer skin 66 can be formed with a plastic inner coating 67 which is resistant to the fluid to be pumped (FIG. 5).
  • the conveying hose 32 can also consist of a textile outer hose 68, which essentially absorbs the negative pressure forces that occur, and an unstable, resistant inner hose 69 (FIGS. 6, 7).
  • the hoses are advantageously each connected to fittings by means of hose clamps in such a way that they can be detached from the fittings and thus replaced without opening the pump cover.
  • the circumference of the hose should be such that it is not greater than twice the distance between the rear end wall 35 and the cover 43, so that the hose can lie flat on the support 48 in the crimped state without folds.
  • a flat tube consists of two flat webs 72, which are placed one on top of the other with their respective surfaces provided with a coating 74 and are connected to one another in their edge regions 75 by a seam 77.
  • a one-piece pre-formed plastic tube is even more advantageous.
  • Hose nozzles 95 adapted to the hose shape are advantageously used to connect such flat hoses to the suction nozzle 45 or the pressure nozzle 46 (FIGS. 9-11).
  • sealing lip 101 and 102 on its two longitudinal edges 99 and 100 (FIG. 12).
  • the sealing lips can be designed so that they seal only on one side or on two sides. Sealing on one side, namely from the higher pressure in the interior to the lower pressure in the suction space 38.1, is generally sufficient.
  • the separating part squeezes onto the hose 32 as flexibly as possible, it is advantageously provided with an elastic support 109 on its outside 108.
  • the separating part itself advantageously has a reinforcing insert. It is advantageously formed on its inside with a transverse corrugation, which contributes to the fact that barrier liquid is distributed evenly without sliding effect between the rollers 52 and the separating part 34 along the separating part. Instead, the rollers 52 can be one . Have cross corrugation. If instead of rollers 52 sliding squeeze bodies are used, it is advantageous to use a separating part 34 without corrugation so that these sliding bodies slide on a barrier liquid film on the separating part.
  • the separating part 34 does not have an elastic support 109, but instead the support 48 on the peripheral wall 37 is sufficiently elastic, it is advantageous to apply a transverse corrugation 97 on the outside 108 of the separating part 34, as shown in FIG. 1 .
  • This transverse corrugation leads to the hose between the support 48 and the roller 52 being pressed off at several points with the separating part 34 therebetween, so that a multiple seal against the inflow of fluid from the intermediate chamber 63.3 of the hose 30 is ensured.
  • the separating part can also be made narrower in the area of the pressure space 38.2 than in the area of the suction space 38.1, since it is no longer necessary to form a closed volume in the pressure space.
  • the suction space 38.1 is connected to a vacuum gauge 136.
  • a snifting valve 123 with an adjusting device 136 which allows air to pass from the pressure chamber 38.2 into the suction chamber 38.1 through a through opening 131. This allows the vacuum in the suction chamber 38.1 and thus the suction height of the pump to be set.
  • Each pulsation damper 137 consists of a molded body which is connected to the outside air via a feed line 141.
  • a pump according to the invention there is an inflatable pad 48.
  • the inflation takes place via line-shaped cavities 146 in the support. If the pad 48 is heavily inflated, the tube 32 between it and the separating part 34 is squeezed out completely at the location of a roller 32. If, however, the pad 48 is only slightly or not at all inflated, the hose is no longer squeezed sufficiently, as a result of which liquid can flow back from the pressure side to the suction side and thus the pump no longer delivers.
  • the cavities 146 are closed on one side by a sealing plug 147, while on the other side compressed air is supplied from a pressure accumulator 157 to each conduit-shaped cavity 146 via a collecting tube 152 and individual tubes 151. This receives compressed air via a pressure reducing valve 155 and a shut-off valve 156.
  • the compressed air required to inflate the support 48 according to the embodiment of FIGS. 17-20 can itself be obtained with a hose pump 30 designed according to FIGS. 21-23.
  • This hose pump has a secondary hose pump 177 with a secondary delivery hose 178, which runs along the inside of the separating part 34 from a secondary suction nozzle 181 to a secondary one ren pressure port 182 is installed.
  • a circumferential groove 179 is cut out, through which the secondary delivery hose 178 is guided. However, the groove is only so deep that the squeezed secondary delivery hose 178 has its place.
  • the pressure of the air can be adjusted by a valve 189 with adjusting screw 196.
  • the end of the support 48 located on the pressure side is designed as a pulsation damper 137 in the embodiment according to FIG. 21.
  • an open band can also be used as the separating part 34, which is firmly attached to the housing 31 at both ends.
  • any squeeze body can be used, even those that only slide, i.e. do not roll, whose axes are parallel and concentric to the rotor axis.
  • the quantity which can be conveyed can also easily be changed by replacing hoses which each have different cross sections. It is only necessary to ensure that the outer circumference of the tube corresponds at most to twice the distance between the two planar boundary walls. Such adjustment of the delivery rate through the use of hoses with different cross-sections is not possible with conventional peristaltic pumps, since the entire pump construction is adapted in terms of depth and diameter to the diameter of a specific hose.
  • the pump already works with a single squeeze body rotating inside the separating part.
  • at least two bodies are present for practical purposes.
  • Three or four squeeze bodies are advantageously used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP84106168A 1983-06-03 1984-05-30 Schlauchpumpe Expired EP0130374B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84106168T ATE22159T1 (de) 1983-06-03 1984-05-30 Schlauchpumpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3320091 1983-06-03
DE3320091A DE3320091A1 (de) 1983-06-03 1983-06-03 Schlauchpumpe

Publications (3)

Publication Number Publication Date
EP0130374A2 EP0130374A2 (de) 1985-01-09
EP0130374A3 EP0130374A3 (en) 1985-04-17
EP0130374B1 true EP0130374B1 (de) 1986-09-10

Family

ID=6200564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106168A Expired EP0130374B1 (de) 1983-06-03 1984-05-30 Schlauchpumpe

Country Status (5)

Country Link
US (1) US4540350A (ja)
EP (1) EP0130374B1 (ja)
JP (1) JPH0694873B2 (ja)
AT (1) ATE22159T1 (ja)
DE (2) DE3320091A1 (ja)

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Also Published As

Publication number Publication date
ATE22159T1 (de) 1986-09-15
EP0130374A3 (en) 1985-04-17
JPS6079188A (ja) 1985-05-04
DE3320091A1 (de) 1984-12-06
US4540350A (en) 1985-09-10
JPH0694873B2 (ja) 1994-11-24
DE3460686D1 (en) 1986-10-16
EP0130374A2 (de) 1985-01-09

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