EP4251885A1

EP4251885A1 - Hose pump

Info

Publication number: EP4251885A1
Application number: EP21819740.8A
Authority: EP
Inventors: Erich Scheugenpflug
Original assignee: Dosmatix GmbH
Current assignee: Dosmatix GmbH
Priority date: 2020-11-24
Filing date: 2021-11-22
Publication date: 2023-10-04
Also published as: DE102020131083A1; JP2023550140A; US20230287877A1; WO2022112183A1

Abstract

The aim of the invention is to allow the use of an inexpensive hose pump (1) as a conveyor pump, for conveying to a load (104), in a discharge device (100), in which the air chamber in the storage container is connected to a vacuum pump (102) via a negative pressure connection. This is achieved in that in order to restore the shape of the hose (2) after being pressed together, either negative pressure or even a vacuum is used on the exterior of the hose (2) in the interior (6) of the hose pump (1) or the shape is mechanically restored. The hose (2) can be deformed by rigid pressing elements (8) or by flexible pressing cushions (23) or pressing collars (24), preferably comprising individual chambers (18a-d) one behind the other.

Description

hose pump

I. Field of application

The invention relates to the transport of liquids or viscous substances in a transport line.

II. Technical background

The transport of viscous, viscous substances in lines is often difficult, as they build up a high flow resistance.

In addition, these substances - which are required in electronics, the cosmetics industry or adhesive technology - can either be very sensitive and/or abrasive and/or adhesive, which makes handling even more difficult.

In principle, attempts are made to handle these materials without them being able to penetrate into gaps such as between a valve body and a valve seat or into other cavities in which they can deposit and, in the case of hardenable materials, also be able to harden.

A typical problem is transporting such materials from a storage container such as a barrel, a cartridge or a pre-treatment unit, such as a mixer, to a consumer, for example a dosing unit for dispensing these substances in precisely specified, i.e. dosed, quantities To do this, the consumer must often have a certain minimum pressure, which should be constantly maintained during delivery. In order to avoid deposits, membrane pumps were used in the past for transport in hose lines, in which an oscillatingly driven membrane allows the material to be conveyed in portions in a line to the consumer, but such membrane pumps are often not in their stroke volume accurate enough.

In addition, hose pumps are known in which the transport is carried out by regularly deforming an elastic hose - which is part of the line through which the material is guided - it causes problems to transport a material that is not subject to the ambient pressure, but only an extremely low residual pressure close to zero of a few millibars, which is always the case when the material has to be conveyed out of a processing device or a container that is kept under vacuum to avoid air pockets.

In peristaltic pumps, a cross-section variator is attached to the elastic hose and is able to reduce the cross-section of the hose and compress it, if necessary down to zero, i.e. to seal it, whereby the pressing point is usually moved along the hose and the material in the hose is pushed in front of the pressing point by means of the cross-section variator.

Typical cross-section variators include compactors in the form of non-deformable, rigid shoes or rollers which compress the hose transversely and then are moved longitudinally along the hose.

In addition, elastic press bodies are known, for example in the form of a pressure sleeve arranged over the entire circumference of the hose or a pressure pad lying against it only over a partial area of the circumference. These elastic compacts are usually hollow and can be filled hydraulically or pneumatically, thereby compressing the hose. III. Presentation of the invention a) Technical problem

It is therefore the object of the invention to provide a peristaltic pump and a dispensing device equipped with it that avoids the problems described and is also easy and inexpensive to produce and has a long service life, as well as a method for operating such a pump discharge device. b) Solution of the task

This object is solved by the features of claims 1 , 13 and 16 . Before some embodiments result from the dependent claims.

With regard to a peristaltic pump, this object is achieved in that the peristaltic pump has a pressure-tight housing around the hose in the pumping section, i.e. the area in which the pressing point is located or can move, preferably around the entire peristaltic pump hereabouts.

The hose can enter the housing via a pressure-tight inlet opening and a pressure-tight outlet opening and exit the housing again, and the housing has a pressure connection with which a desired pressure, in particular negative pressure, can be set in the housing, which is thus on the outer circumference of the hose prevails.

With such a design of the hose pump, a targeted setting of the ambient pressure around the hose in the area of the hose pump in relation to the pressure in its interior is possible.

The controller, which controls the entire peristaltic pump, and also the pressure inside the housing, should be designed in such a way that it is able to to control the pressure in the housing via the pressure connection, for example, so that it corresponds to the pressure inside the hose and/or to create a vacuum in the housing between the pressing processes of the hose pump compared to either the ambient pressure or also compared to the pressure inside the hose.

It should be made clear that a peristaltic pump generally requires a partially elastic body that is open on both sides and can be flown through, which is referred to here as a hose, although the body does not have the typical appearance of a hose, i.e. neither a round cross section nor a smooth one must have a greater extent in the direction of flow than in the transverse direction. All elastic hollow bodies with two openings are to be understood by the term hose.

Instead or as a support, the elastic flow-through body can be designed in such a way that, after the end of the compression, it resumes its non-compressed initial state without external influence, whether due to the structure or material properties of its peripheral wall.

For example, the peripheral wall can consist of a so-called memory material, which either always returns to its original shape or returns to its original shape under certain physical conditions.

Another possibility is that the resilience to the initial state is caused by an external influence:

For example, in order to reduce its cross-sectional area, the hose can be acted upon in a first direction transverse to its longitudinal direction, but in order to deform it back into its initial state, force can be applied in a second transverse direction, in particular perpendicular to the first transverse direction, and thereby the Recovery is favored or caused in the first place. The application of force in the second, re-deforming transverse direction can be carried out by means of a press body which acts on the hose, in particular only periodically, or for example by means of a resilient element which bears against the hose, in particular permanently, on its outside or inside.

Thus, a compression spring arranged inside the hose, for example a spiral spring, can apply force to the hose radially outwards, or else a spring acting on the outside of the hose.

Such resilient elements can also only be present in sections in the longitudinal direction of the hose.

In this way, the rebound can be ensured even if the relation between the external pressure and the internal pressure with regard to the hose is unfavorable for this.

In most peristaltic pump designs, the cross-section variator includes a rigid compression body that mechanically compresses the hose.

For the present case, however, designs of cross-sectional variators are also suitable that are not rigid but can change their shape and are in particular elastic pressed bodies, for example are themselves hollow bodies and change the internal pressure of at least one corresponding connection via corresponding connections can become.

Such a non-rigid, in particular elastic, pressed body can bear against the hose with part of its peripheral wall and when pressure is applied to the interior of such a cross-sectional variator, the peripheral wall of the cross-sectional variator can be pressed against the peripheral wall of the hose and compress it. The pinch point with the reduced cross-sectional area can also be moved in the flow direction of the hose, in particular without the cross-section variator moving in this direction, simply because the point of greatest expansion of the cross-section variator is transverse to the hose in the longitudinal direction of the Hose, the direction of flow, can change.

If the cross-section variator is able to compress the inner cross-section of the hose down to zero, so that the inner cross-section is closed and thus act as a check valve, it is called a pinch valve,

The peristaltic pump according to the invention can also comprise several cross-section variators one behind the other in the direction of flow, which then preferably have to be drivable out of phase or have to be drivable in a specific temporal correlation to one another.

The interior of the compact can have several chambers in the direction of flow, in particular one behind the other, which expand one after the other transversely to the longitudinal axis of the hose and compress it, one after the other in the direction of flow, whereby the material in the hose is pushed forward in the direction of flow.

The individual chambers can be connected to one another, with throttling points between the chambers, and in particular there can be only one common compression pressure connection for the entire compression body.

Alternatively, the individual chambers can also not be connected to one another, ie they can be separate chambers that each have a separate compression pressure connection, which are then pressurized according to this progression sequence. Preferably, at least the first chamber in the flow direction is able to reduce the cross-sectional area of the tube to zero in order to avoid backflow of material into the tube.

In the case of the other chambers, on the other hand, it makes sense to compress them down to a small but remaining cross-section in the hose, so that no material is trapped between the closed cross-section in the first chamber and another closed cross-section in a second chamber, which is then under very high pressure pressure would stand. If there are residual cross-sections, the material can always move away from the closed pressing point and thus in the direction of flow.

After the pressing points have been opened, material flows from upstream into the hose, especially if there is another pressing point at the end of the stretch of pressing points that are not completely closed, which completely closes the cross-section of the hose for this purpose, i.e. another pinch valve .

A sequence of pinch valves can also be controlled in this way if the pieces of hose between them withstand the pressure that occurs therein when two adjacent pinch points are closed one after the other.

The hose pump preferably also includes a vacuum sensor for measuring the negative pressure in the housing around the hose in order to be able to control the variator drive or the vacuum pump for generating the negative pressure in the desired manner.

Since many viscous materials become more liquid with increasing temperature, a heater can also be present, in particular with a temperature controller that heats the hose pump, i.e. either the interior of the housing and/or the hose itself, so that the material in the hose heats up and thus flows more easily and the effort required to operate the hose pump decreases.

The pressure present in the material can also be monitored by a pressure sensor, which can be arranged, for example, upstream and/or downstream of the pumping length region in which the cross-sectional area of the hose is changed.

Such a pressure sensor does not necessarily have to be connected to the material in the hose:

For example, he can also measure the outer circumference or outer diameter of the hose and draw conclusions about the pressure prevailing inside if the elasticity of the hose is known at this point.

Also, in an elastic compact, the inside of which can be pressurized, the pressure inside the elastic compact can be measured by a pressure sensor, and based on the pressure inside the elastic compact or equated to the pressure in the material inside the hose can be closed by the controller.

Since such a peristaltic pump is simple and inexpensive to produce and, depending on the material of the peristaltic tube, also has a long service life, this is a possibly better solution than membrane pumps, also depending on the materials to be pumped.

With regard to the Ausbrinq-Vorrichtunq, which comprises a storage container for the material with an outlet opening in its lower area and a hose pump, which is fluidically connected to this outlet opening, the existing task is solved in that the hose pump is designed as described above is. For the case primarily considered here, in which the material in the reservoir is subject to negative pressure, i.e. due to the incompressibility of a viscous or liquid material, the air space above the material in the reservoir is subject to negative pressure, the housing of the peristaltic pump should be designed in such a way that that it can be subjected to the same negative pressure inside as the air space in the reservoir.

This eliminates the risk that the compressed hose will no longer expand back to its original state after the compression force has been removed due to the negative pressure present in its interior.

A check valve which can completely block a free cross-section of the hose, in particular a pinch valve, is preferably arranged between the reservoir and the cross-section variator, and the check valve can also be part of the hose pump.

In order to reduce the periodically generated by a peristaltic pump rising and falling pressure at the outlet of the peristaltic pump with regard to the consumer, two or more peristaltic pumps can be connected in parallel if either a controller is available that is able is to operate these peristaltic pumps out of phase, with two peristaltic pumps to drive them alternately and/or simply to drive the multiple peristaltic pumps by just one common pump drive, and the phase offset by the corresponding mechanical design of the common pump Drive is realized.

This allows the high pressure phases at the outlet of one of the peristaltic pumps to follow almost seamlessly with phases of high pressure at the outlet of the other peristaltic pump, and the output lines of the peristaltic pumps are merged into a single delivery line to the consumer. With regard to the method for operating a hose pump, in particular as part of a dispensing device as described above, this task is solved in that the interior of the pressure-tight housing around the pumping area of the hose is under the same or even an even stronger negative pressure is maintained like the air space in the reservoir above the material.

If several cross-section variators are present one behind the other in the direction of flow and are in contact with the same hose, these will be operated in different phases, in particular the individual cross-section variators will be activated one after the other in the direction of flow.

If there are several peristaltic pumps that are connected in parallel and are attached to different hoses, the periodic pressure fluctuations in the delivery line to the consumer are reduced or eliminated by the peristaltic pumps being phase-shifted, in particular with two peristaltic pumps alternatingly driven will. c) exemplary embodiments

Embodiments according to the invention are described in more detail below by way of example. Show it:

Figure 1a: a mechanical hose pump,

Figures 1b, c: cross sections through the hose in the hose pump according to Figure 1a,

Figures 2a-f: a first design of a pneumatic or hydraulic

Hose pump in longitudinal section along the hose in various functional states,

Figures 3a, b: a 2nd design of a pneumatic or hydraulic

Longitudinal section of the hose pump along the hose in various functional states Figure 4: mechanical additional equipment for a hose pump similar to Figure 1a,

FIGS. 5a-c: cross sections at different points through the hose pump according to FIG. 4 in different functional positions, FIG. 6: a 3rd design of a pneumatic or hydraulic pump

Hose pump in longitudinal section along the hose,

FIG. 7: a dispensing device with a storage container for viscous or liquid material and a hose pump according to the invention,

FIG. 5 reveals the problem on which the invention is based:

The dispensing device 100, the controller 100* of which controls the moving parts of the device, initially comprises a storage container 101, which is filled from a supply container (not shown), e.g serves:

For this purpose, a mixer can rotate in the storage container 101 and/or pumping can be carried out and/or thin-film degassing can be carried out or other treatment steps can be carried out.

In order to avoid the formation of new air pockets, the air space in the reservoir 101 is above the material with a negative pressure close to vacuum, from about 1 mbar to 50 mbar absolute pressure, generated by a vacuum pump 102, which removes the air sucks the air space of the reservoir 101 from.

The material M is removed from the reservoir, preferably at its deepest point, from an outlet opening 101a and fed via a connecting line 103 to a consumer 104, here a dosing device 104 for dispensing precisely dosed quantities of the material M via a discharge, for example - Nozzle 105. So that this—usually intermittent—discharge from the discharge nozzle 105 can take place at any time, the material M must always be in contact with the consumer 104 with a specific minimum pressure, while pressure fluctuations above the minimum pressure are acceptable.

According to the invention, this pressure is maintained by a hose pump 1 in the connecting line 103, in this case connected directly to the outlet opening 101a of the reservoir 1 instead of the membrane pumps or piston pumps otherwise present at this point, since hose Pumps are available as simply constructed and inexpensive standard parts that can be purchased separately.

The problem here is that with a conventional hose pump, the hose is compressed at one or more pressing points in terms of its cross section, and after this pressing force is removed, it deforms back to its original, mostly round, cross section on the one hand due to the restoring force of the elastic Material of the wall of the hose, but above all also because of the overpressure prevailing inside the hose in the material M conveyed in it.

However, since in the present case the air space in the reservoir 101 is acted upon by a quasi-vacuum - hereinafter referred to simply as a vacuum - this also applies to the material M present below the air space and thus also to the material M in the connecting line 103. so that the peristaltic pump 1 lacks an essential parameter for the return from the compressed to the non-compressed cross-section of the peristaltic tube, which, however, is essential for the function of a peristaltic pump.

Figures 1a - c show a hose pump 1 which is known per se and is only equipped with additives according to the invention: In this case, a hose 2 made of an elastic material is guided in a U-shape in a plane running through a housing 5, the U-shape having the shape of a flow circle in the reversal area. In the center of this semicircular end of the U - viewed perpendicularly to the U-shaped plane U", in which the hose 2 lies, i.e. as shown in Figure 1a - rotates a two-armed rotary lever 28, whose opposite, equal-length Flebelarme on End each have a press body 8, here in the form of a press roller 8 wear, which about a press roller axis 8 ', which is perpendicular to the U-shape plane U', on the rotary lever 28 is rotatably held. The rotary lever 28 is also driven by a variator drive 4 and controlled by a controller 1 ^* of the hose pump 1 - which is an integral part of the controller 100 ^* of the spreading device can - clockwise in a certain direction of rotation R, here rotated.

As is known, the lengths of the lever arms of the rotary lever 28 and the diameter of the two press rollers 8 are measured in such a way that each of the press rollers 8 presses radially from the inside outwards against the hose 2 for a little more than half a turn and presses it in a radial direction direction of its cross-section 2", because on the radial outside of the U-shaped deflection area of the hose 2, the hose 2 presses against a mostly plate-shaped counter-holder 21 that extends over at least the semicircular deflection area of the hose 2, as in the figures 1b and 1c.

At the pressing point S in the direction of rotation, at which the pressing roller 8 momentarily acts on the tube 2, its wall 9 is preferably flattened, so that the inner free cross-section 2" is zero or tends towards zero, as shown in FIG. 1c.

As a result, the pressing roller 8 moving along the tube 2 pushes the material M contained in the tube 2 in front of it and transports it in the direction of flow 10 along the tube 2. The two ends of the hose 2 in the housing 5 are usually tightly connected to a flange-shaped inlet opening 5a on the one hand and outlet opening 5b on the other hand, and the material is thus pushed out of the outlet opening 5b. The openings 5a, b are in turn connected to the housing 5 in a sealed manner.

In a known hose pump 1, the hose 2 resumes its original, unstressed cross-section, generally a circular cross-section immediately behind the pinch point S, as shown in FIG. 1b.

Due to the lack of internal pressure in the interior of the hose 2, this would have to be done solely due to the restoring force of the wall 9 of the hose 2, which means a less elastic hose and thus a high force to be applied by the cross-section variator 3, here the rotary lever 28 with the press rollers 8, would require.

In order to avoid this, the interior 6 of the housing 5, which is tightly closed, has a vacuum connection 7, via which a vacuum can be generated inside the housing 5 by means of a vacuum pump 20, if necessary even a lower pressure than it is in Interior of the tube 2 prevails, so that one factor for preventing the rebound of the tube 2 is eliminated, namely a higher external pressure than the internal pressure with respect to the tube 2.

If the peristaltic pump 1 is used as part of a dispensing device 100 according to Figure 7, the vacuum connection 7 of the vacuum pump 1 is preferably connected via a vacuum line 106 to the same vacuum pump 102 that also applies a vacuum to the air space of the reservoir 101 .

A vacuum sensor 15 can also be present in the interior 6, which measures the pressure there, i.e. negative pressure, for control purposes and sends it to the controller 1 ^* . reports, which can then vary the assignment with negative pressure on the negative pressure connection 7.

Furthermore, one or more pressure sensors 19 a, b, c can be present in the interior 6 in order to measure the pressure in the hose 2 and in particular along the hose 2:

Thus, near the inlet opening 5a and the outlet opening 5b in the housing 5 for the hose 2, a pressure sensor 19b, c can be arranged on the outside of the hose 2, in particular resting against it and measuring the pressure therein - directly or indirectly via the shape of the cross section of the hose 2 - measure.

Furthermore, a pressure sensor 19a may be present, approximately in the middle of the U-shaped bend in the hose 2, which is directed towards the radially inner region of the peripheral contour of the hose 2 and measures its position relative to the counter-holder 21 lying radially further outside, in particular during the passage of the press roller 8, and from this the pressure inside the hose 2 is determined who can.

In order to heat the material M conveyed in the hose 2 and thereby make it more liquid, a heater 16 can be present in the interior 6, for example by electrically heating the counter-holder 21, in particular if this is made of metal.

Preferably, the heater 16 is equipped with a temperature control 17, which is preferably part of the controller 1 ^* of the peristaltic pump 1.

Figure 4 shows an alternative to reshaping the hose 2 downstream of its pinch point S instead of and/or in addition to the vacuum connection 7, which can be used primarily with the hose 2 running straight in the area of the hose pump 1, i.e. less with the in a U-shape laid hose according to Figure 1a. The flattened cross-section 2" of the tube 2 is deformed back into the original, round cross-sectional shape by means of passes of at least one further press roller 26, as best shown in the cross-sectional representations of Figures 5a - c with the tube 2:

Figure 5a shows the unloaded, circular cross section of the hose 2 cut sufficiently far away from the pinch point S.

Figure 5b shows the hose 2 in the almost tightly compressed state of its cross section 2" at point S, but not squeezed between a press roller 8 and a counter-holder 21 as in the hose pump according to Figure 1a, but between two - preferably identically shaped - Press rollers 8 which act on the tube 2 at the same pinch point S from two opposite sides with respect to the cross section of the tube 2 . The press roller 8 is preferably attached to the free end of a rotary lever 28 with only one arm, and it is not a 2-arm drive unit 28 with a press roller 8 at each of its free ends.

The reason is that after the two press rollers 8 that compress the hose 2 have passed at the press point S, another pair of press rollers 26, mounted on rotary levers 27, must be able to act on the hose 2 in order to press them apart again into their original cross-sectional shape before the rotating rotary lever 28 reach the press point S again.

While the two compressing rotary levers 28 with the press rollers 8 are in a position shown in FIG. rotate in the plane of rotation 28" containing the transverse direction 11, the rotating levers 27, pointing apart, rotate with their press rollers 26 in a plane of rotation 27" containing the second transverse direction 12, which is transverse, preferably perpendicular, to the plane of rotation 28", with both planes of rotation indicating the flow direction 10, i.e. the hose direction, included. For this purpose, the circumferential groove 26a of these pressure rollers 26 has a cross section that is approximately semicircular with a radius that is slightly larger than or equal to the radius of the outer circumference of the undeformed tube 2 according to FIG. 5a. In which the two press rollers 26, when they are in their maximum mutually approximate position, in which their rotary levers 27 point towards one another - as shown in Figure 5c - reach very close radially towards one another and leave a free space between them which corresponds to the shape of the undeformed cross-section of the hose 2 or only is slightly larger than this, the hose 2 is pressed apart again in its original, round cross-section.

In this way, the reshaping takes place mechanically and at most additionally, but not necessarily, by the negative pressure present on the outside of the hose according to the solution in FIG. 1a.

Figures 2 and 3 show solutions in which the hose 2 is not compressed in its cross-section by means of rigid press bodies 8 or 26, but rather by elastic, hollow press bodies that can be expanded in the cross-sectional direction of the hose 2 in the direction of its central longitudinal axis 2':

These can be press collars 24 that run in a ring around the longitudinal axis of the hose 2, or pressure pads 23 that are arranged on just one or two opposite sides of the cross section of the hose 2, which are present opposite one another, in particular at the same longitudinal position, in which case the two pressure pads located opposite one another 23 are always operated synchronously. Preferably, several pressure pads 23 or dress cuffs 24 are present one behind the other in the direction of flow 10 .

The pressure pads 2 or press sleeves 24 are supported on their radial outside on a fixed counter-holder 21, in the case of a press sleeve 24 a counter-holder tube running around the longitudinal direction 2' of the hose 21, and are at least in the expanded state not only at the beginning of the hose 2 Außenum, but compress its cross-section, ge if necessary to zero. If, as shown, the counter-holder 21 is part of the press pad 23 or the press sleeve 24, the two must be tightly connected to one another.

Of these pressure pads 23 or press sleeves 24, four such, in this case ring-shaped, pressure pads with pressure chambers 18a-d are shown in the first construction according to FIGS. A tight fixation between the membrane of the press cushion 23 or the press sleeve 24 and the counter-holder 21 is then necessary between the chambers 18 a, b, c, d.

Each of these pressure chambers 18a-d, which are separated from one another in a pressure-tight manner, is equipped with its own press-pressure connection 14ad, the pressurization of which—usually by opening and closing valves not shown—is controlled by the controller 1*, which is also not shown. the peristaltic pump 1 is controlled in the correct time relation to one another in order to achieve the function described below: To push the material M forward in the conveying direction 10, the rearmost, first pinch point S1 in the desired conveying direction 10 is activated, i.e. the one there Pressure chambers 18a of the compression sleeve 24 are subjected to pressure, so that their elastic wall, which rests against the wall 9 of the hose 2, expands radially inward and the hose 2 is radially squeezed together, preferably until its inner passage is closed. As a result, the material M previously present in the hose at this pinch point S1 is pushed out both in the conveying direction 10 and in the opposite direction to this.

While this pinch point S1 remains closed, as shown in Figure 2a, the next pinch point S2 next to it as shown in Figure 2b is then activated one after the other, and the cross-section of the tube 2 is also reduced there, but the cross-section is not completely closed, so that the material displaced in this area can only escape in the conveying direction 10 through the pinch point S2. Subsequently - with the previously activated pinch points S1 and S2 remaining in their pinching position ver - the next pinch point S3 in the conveying direction 10 and then also S4 are activated according to FIGS activated chambers 18a, b, c remain in this state.

In this way, a considerable amount of material is pushed through the tube 2 in the transport direction 10 downstream of the last activatable chamber, here 18d.

For the next conveying process, after activating all existing chambers 18a-d, the last chamber 18d in the conveying direction 10 is further pressurized and the hose 2 is thereby compressed at this last pinch point S4 down to a cross-section of zero, i.e. closed and held.

Once this last pinch point S4 has been closed, the pinch points S1, S2, S3 upstream of it are deactivated one after the other, i.e. the cross-section of the hose is opened again, beginning with the pinch point S1 and S1 furthest upstream then continuing with the respective next squeezing points S2, S3 in the conveying direction 10. As a result, material from the upstream region is sucked through the expanding interior of the hose in the direction of the completely closed squeezing point S4. In this case, too, the return deformation of the hose can be promoted by negative pressure connections 7, which in each case in the area between the pinching points S1-S4 create a negative pressure in the radial area between the membrane of the press sleeve 24, for example, which is supported on the counter-holder tube 21 and the hose 2.

FIG. 2e shows the state shortly before the last squeezing point S3 in the conveying direction 10 is deactivated before the closed squeezing point S4; FIG. 2f already shows all other squeezing points S1-S3 that are present upstream of the closed last squeezing point S4 opened and the hose again has its unloaded, mostly circular, cross-section at these pinch points S1-S3.

The next conveying cycle can then begin again, beginning with the deactivation and closing of the most upstream squeezing point S1 according to FIG. 2a.

Instead of designing the first and last pressing point as a pinch valve, i.e. with the possibility of completely closing the hose cross-section, conventional check valves, for example with a valve seat and valve body, can also be provided in the hose upstream and downstream of the hose pump Rule allows contact between the Ma material and the joints between the valve seat and valve body, which is not desired due to the often adhesive effect of the material M.

While in FIG. 2a-f the press-pressure chambers 18a-d are not connected to one another in terms of pressure, FIGS. 3a, b—also in a longitudinal section along the hose 2—show a second design in which these chambers 18a-d are connected to one another in terms of pressure , but by acting as a throttle, relatively small connecting openings 29a-c, which are preferably distributed over the circumference around the hose 2 as individual through-openings or as a single through-opening and not as a through-ring. The first chamber 18a is in turn connected to a press-pressure connection 14A, but downstream of this at most the last press-pressure chamber 18d is connected to a further press-pressure connection 14B:

For the forward conveyance of the material M inside the hose 2 in the longitudinal area of the hose pump, all that is required - with the press-pressure connection 14B closed, if present - is to press-pressurize the press-pressure connection 14A, usually with compressed air, so that then the chambers 18a, b, c, d - due to the throttle points 29a-c in chronological succession - expand against the hose 2 and cause the same effect as in Figures 2a-d.

In Figure 3b the state is shown in which the chambers 18a and b are already fully stretched and next the clamp 18c will expand radially inwards, in which case fully stretched means that in the fully stretched region of the chambers the Cross-section of the Schlau Ches 2 is reduced to zero, so is closed, with the strom downward beginning of the closed hose section moves in the conveying direction 10.

In order to draw up new material M inside the hose 2 in the length area of the hose pump 1, the pressure present at the press-pressure connection 14 A is reduced, if necessary to ambient pressure or even to the negative pressure range, which first causes the chamber to expand 18a and consequently also the downstream chambers 18b, 18c and 18d. As a result, the tube 2 is deformed back into its original, open cross section at the upstream squeezing points S3, S2, S1 and material is subsequently supplied in the direction of the most downstream squeezing point S4.

If the press-pressure connection 14B is present, press pressure can be applied to it for a short time and the chamber 18d there can preferably completely close the cross-section 2" of the hose 2, which gene of material from the area upstream of the peristaltic pump 1 favored taken. Preferably, the pressurizing of the pressurizing port 14B is not performed until the upstream chambers 18a-18c have all reached their fully contracted states. B.

FIG. 6 shows a third design of the peristaltic pump 1 similar to that of the first design according to FIGS. 2a to f.

In contrast to this, the hose 2 itself is already part of the ring-shaped circumferential press sleeve 24 - which therefore does not have its own elastic membrane in addition to the hose 2 - of which in the case shown there are four pieces one behind the other in the flow direction 10 and form annular peripheral chambers 18a to 18d, the radial outside of which is in turn formed by a tubular counter-holder 21, in which the hose 2 runs along.

Here too, each of the chambers 18a to 18d can be pressurized via its own individual pressure connection 14a to 14d.

To convey material, the chambers 18 a to d can be pressurized one after the other in the direction of flow 10, as in the design according to Figure 2, and the free cross section of the hose 2 can thereby be reduced at the individual pressing points S1 to S4, preferably at the ström upstream pressing point S1 can be reduced to zero, while the subsequent pressing points are not completely closed for conveying.

Figure 6 shows the situation that at the 1. Pressing point S1 the hose 2 is already tightly compressed and at the pressing point S2 the hose is already compressed down to a reasonable remaining cross-section, whereupon the compression at the subsequent pressing points S3 and S4, preferably again down to a reasonable remaining cross-section, takes place becomes. Since it is preferable not to damage hose 2, its inner cross-section between the individual pressing points S1 to S4 and at the beginning and end of hose pump 1 is kept open by a support ring 22 that fits into the inner circumference of hose 2 and is inserted into the hose the outer circumference of the hose 2 fitting to the inner circumference of the tubular counter-holder 21 holds. As a result, there is no need to fix the hose 2 in relation to the counter-holder 21, for example by gluing it, which also allows small compensatory movements of the hose 2 in or against the direction of flow 10.

After a delivery stroke, the most downstream chamber 18d can initially remain activated for sucking up material, as described with reference to FIG and the hose cross-section opens there and material is sucked in up to the closed pressing point S4.

This is preferably only vented or subjected to negative pressure when or shortly before the first chamber 18a is already subjected to compression for the next delivery stroke.

REFERENCE LIST

1 peristaltic pump

1* control

2 elastic body, hose

2' central longitudinal axis

2" cross-sectional area

3 cross section variator

4 variator drive

5 housing

5a inlet port

5b outlet port

6 interior of 5

7 pressure connection, vacuum connection

8 press body, press roller

8a circumferential groove

8' axis of rotation

9 wall

10 flow direction

11 1. Transverse direction

12 2nd transverse direction

13 pinch valve

14a - d press pressure connection

14A, b Press pressure connection

15 vacuum sensor

16 heating

17 temperature control

18 interior 18a,b,c chamber

19 pressure sensor

20 vacuum pump 21 anvil, anvil plate, anvil tube

22 heating

23 press pads

24 press sleeve

25 fixation point, fixation circulation

26 press roller

27 rotary lever

28 rotary lever

29a - c connection opening, throttle point

100 deployment device

100* control

101 reservoir

101a outlet port

102 vacuum pump

103 connection line

104 consumers, dispensers

105 application nozzle

106 vacuum line

m material

R rotation direction

S pinch point

U" U-shape level, hose level

Claims

PATENT CLAIMS

1. Peristaltic pump (1) with

- a body (2) open on both sides, called a hose (2), through which a flow can flow in the flow direction (10) and which is at least partially elastic with respect to the peripheral wall,

- A cross-section variator (3) on the hose (2), which is able to compress the hose in the transverse direction and to reduce the inner free cross-sectional area (2") of the hose (2),

- A variator drive (4) for controlled activation and deactivation of the cross-section variator (3),

- A controller (1*) for controlling the peristaltic pump, in particular for controlling the variator drive, characterized in that

- a pressure-tight housing (5) around the hose (2) in the area of the hose pump (1), in particular around the entire hose pump (1),

- With a pressure-tight inlet opening (5a) and pressure-tight outlet opening (5b) for the hose (2) and

- A pressure connection (7), in particular a vacuum connection (7), connected to the interior (6) of the housing (5).

2. Hose pump according to claim 1, characterized in that the controller (1 *) is able to over the pressure port (7) the pressure in the

housing (5)

- To control either in accordance with the inside of the hose (2) anlie lowing pressure, in particular the average pressure present there or between the pressing operations in the housing (5) to be a negative pressure which is in particular lower than the pressure inside the hose Ches (2).

(Supporting or as an ancillary solution)

3. Hose pump according to one of the preceding claims, characterized in that

- The flow-through bare body (2), in particular the hose (2), which is at least partially elastic with respect to the peripheral wall (9), is designed in such a way that after the compression has ended, it resumes its initial state without any external influence, in particular

- By being acted upon by force to reduce its cross-sectional area in a first transverse direction (11) and to assume its initial state in a second transverse direction (12) with force can be acted upon.

4. Hose pump according to one of the preceding claims, characterized in that

- The flow-through bare body (2), in particular the hose (2), which is at least partially elastic with respect to the peripheral wall (9), is designed in such a way that it resumes its initial state after the end of the compression caused by external, in particular mechanical, influence , especially

- by being at least partially made of a memory material.

(pinch valve:)

5. Hose pump according to one of the preceding claims, characterized in that

- the cross-section variator (3) is designed as a pinch valve (13) in that it is able to reduce the inner cross-sectional area (2") of the hose (2) to zero. (Standing still cross-section variator:)

6. Hose pump according to one of the preceding claims, characterized in that the cross-section variator (3) is able to reduce the pinch point (S, S1) with a reduced cross-sectional area (2"), in particular reduced to zero, in flow direction (10) of the tube (2) to move, in particular without moving itself in this direction.

7. Hose pump according to one of the preceding claims, characterized in that

- Several cross-section variators (3) are arranged one behind the other in the flow direction (10) on the hose (2),

- Which can be operated in particular out of phase, in particular can be operated independently of one another.

(Rigid compact:)

8. Hose pump according to one of the preceding claims, characterized in that

- the cross-section variator (3) comprises at least one rigid, non-deformable pressed body (8),

- which can be moved in particular in the direction of flow (10) along the hose (2), in particular can be moved in a controlled manner.

(Elastic press body :)

9. Hose pump according to one of the preceding claims, characterized in that

- The cross-section variator (3) comprises a press body (8) which is at least partially elastic with regard to its wall (9) and which abuts at a preferably fixed position in the flow direction (10) either on the outside of the hose (2) or on the hose (2) himself is part of the elastic press body (8) and the elastic press body (8) has a press/compression connection (14),

- either only over part of the circumference of the hose (2) as a pressure pad (23) or over the entire circumference of the hose (2) as a pressure sleeve (24),

- In particular, the press motor applying the pressing pressure, which in particular drives a pneumatic pump, is controlled in depen dence on the measured pressure in the hose (2) downstream of the pumping area of the hose pump (1).

10. Hose pump according to one of the preceding claims, characterized in that the interior (18) of the pressure pad (23) or the pressure sleeve (24) is divided into several chambers (18a, b, c, d) arranged one behind the other, in particular in the direction of flow (10). includes that

- are either connected to one another via throttle points (29a-c) and in particular have only one common press-pressure connection (14) or two press-pressure connections (14A, B) at the ends in the longitudinal direction

- Or are not connected to each other, ie are separated from each other and each have separate press-pressure connections (14a, b, c, d) add ver.

11. Hose pump according to one of the preceding claims, characterized in that of the separate chambers (18a, b, c, d), at least the first chamber (18a) in the through-flow direction (10) is able to cover the cross-sectional area (2nd ") of the hose (2) to zero.

12. Hose pump according to one of the preceding claims, characterized in that

- a vacuum sensor (15) is available to measure the negative pressure in the housing (5), and/or a heater (16), in particular with temperature control (17), for heating the hose pump, in particular the interior of the housing (6) and/or the hose (2) in the area of the hose pump (1), and/ or a pressure sensor (19) for measuring the pressure in the material (M) is present, in particular a pressure sensor (19) is present upstream and/or downstream of the pumping length region of the hose (2), in particular the cross-sectional area of which can be changed.

13. dispensing device (100) for dispensing a viscous or liquid

Materials (M) with

- a storage container (101) for the material (M), which is subjected to negative pressure in the air space above the material by means of a vacuum pump (102),

- wherein the reservoir (101) is equipped with an outlet opening (101a) for material (M) in its lower area,

- at least one peristaltic pump (1), which is fluidically connected to the outlet opening (101a),

- A controller (100*), which controls the application device (100) and preferably includes the controller (1*) of the peristaltic pump (1), d a d a r c h g e n n z e i c h n e t, d a s s

- the hose pump (1) is designed according to one of the preceding claims,

- The interior (6) of the housing (5) of the peristaltic pump (1) can be subjected to the same negative pressure as the air space in the reservoir (101).

14. Dispensing device according to claim 13, characterized in that a check valve, in particular a pinch valve (13), for closing the cross-section of the hose (2) is arranged between the storage container (101) and the cross-section variator (3).

15. Dispensing device according to claim 13 or 14, characterized in that there are several peristaltic pumps (1) connected in parallel, and the controller (100*) is able to phase the peristaltic pumps (1) with two peristaltic pumps ( 1) counter-synchronous to drive.

16. A method for operating a peristaltic pump (1), in particular in

Frame of a dispensing device (100) according to one of Claims 10 to 12, characterized in that the same or a lower negative pressure is maintained in the interior (6) of the housing (5) as in the air space of the storage container (101).

17. The method according to claim 16, characterized in that

- there are several cross-section variators (3) in the direction of flow (10), which are operated in different phases,

- In particular, the cross-section variators (3) are activated in the flow direction (10) one behind the other.