DE202022000984U1 - Double peristaltic pump with free outlet - Google Patents

Abstract

Double peristaltic pump with free outlet according to the exemplary embodiment for dosing different liquids without using additional valves.

Description

The present disclosure relates to the design of a double free-flow peristaltic pump for pumping liquids.

As in accordance with the prior art, for example DE000003108129A1 or AT000000367874B known, there are peristaltic pumps which are driven by a separate motor. Such peristaltic pumps consist of a tube which is supported on a housing which is usually circular or similar in shape.

This tubing is usually squeezed by a plurality of circularly moving rollers or shoes which follow the shape of the housing supporting the tubing. However, linear versions are also known, for example from DE102020113267A1 .

This squeezing point, which usually moves in a circular motion, drives the medium in the hose in front of the squeezing. After the pinch, the hose straightens back to its original shape, creating a suction effect. Another roller or a sliding shoe follows at a defined distance and squeezes the hose together again. The medium located between two rollers or sliding shoes in the hose is thus conveyed in the direction of movement of the rollers or sliding shoes. At the pump outlet, the roller or the sliding shoe usually moves away and the medium that was previously between two rollers or sliding shoes is released and can escape at the pump outlet.

If different media are to be pumped at different times, two such pumps are usually required. This solution is usually space-intensive and doubles the costs.

The object of the present invention was to minimize the space required for two pumps and to reduce costs.

The double peristaltic pump disclosed here requires only one motor and is therefore more space-saving and cheaper than two complete pumps.

The double peristaltic pump described here is driven by a motor that can rotate clockwise and counterclockwise in a defined manner. The two pumps are on one axis and rotate at the same time.

According to the clockwise direction of rotation, the liquid is pumped in one direction with the first pump and only air is sucked in with the second pump and therefore no liquid is pumped.

In the anti-clockwise direction of rotation, the liquid is pumped with the second pump and only air is sucked in with the first pump and no liquid is pumped.

A prerequisite for the function of the described double peristaltic pump is that both individual pumps have a free outlet in order to prevent liquid from being transported back. At the same time, it must be ensured that the conveyed air can escape unhindered from the liquid reservoir.

Since the liquid is always present at the pump inlet, it is always possible to suck in the selected liquid with the selected pump of the double peristaltic pump.

When using the version of the double peristaltic pump described here as a dosing pump, the maximum inaccuracy of the dosing is the internal volume of the hose from the suction point of the liquid to the outlet opening.

To reduce the inaccuracy described above, the pumps can be equipped with a return brake. Thus, no air would be pumped in the reverse conveying direction and the inaccuracy is reduced to the internal volume, which is located in half the circumference of the conveying hose. Such a solution is of course more complex and expensive.

The double peristaltic pump can be used with a drive motor directly connected to the pump axis or with a self-centering coupling.

The version with the self-centering coupling is preferably used when the double peristaltic pump is to be separated from the drive motor for functional reasons, for example for maintenance or repair purposes.

• 1 zeigt die Gesamtansicht der oben beschriebenen Doppel-Peristaltik Pumpe mit Doppel-Pumpe (1) und Antriebsmotor (2) sowie dem elektrischen Anschluss (13) des Antriebsmotors (2) für beide Laufrichtungen.
• 2 zeigt die Gesamtansicht der oben beschriebenen Doppel-Peristaltik Pumpe mit Doppel-Pumpe (1) und Antriebsmotor (2) sowie dem Eingang der ersten Pumpe (3), den Ausgang der ersten Pumpe (4), den Eingang der zweiten Pumpe (5) und den Ausgang der zweiten Pumpe (6).
• 3 zeigt den Schnitt A-A durch die Doppel-Peristaltik-Pumpe mit Motor (2), Eingang der ersten Pumpe (3), den Andruckrollen (7), gemeinsamen Achse (8), Rollenführung (9) der ersten Pumpe, Rollenführung (10) der zweiten Pumpe, Gehäuse (11) und Gehäusedeckel (12).
• 4 zeigt den Schnitt B-B durch die zweite Pumpe und den Schnitt C-C durch die erste Pumpe mit Motor (2) und elektrischem Anschluss (13), Eingang der ersten Pumpe (3), den Ausgang der ersten Pumpe (4), den Eingang der zweiten Pumpe (5), den Ausgang der zweiten Pumpe (6), Andruckrollen (7), gemeinsamen Achse (8), Schlauch der ersten Pumpe (14) und Schlauch der zweiten Pumpe (15).

The exemplary embodiment is shown below using drawings:

• 1 shows the overall view of the double peristaltic pump described above with double pump (1) and drive motor (2) as well as the electrical connection (13) of the drive motor (2) for both running directions.
• 2 shows the overall view of the double peristaltic pump described above with double pump (1) and drive motor (2) as well as the inlet of the first pump (3), the outlet of the first pump (4), the inlet of the second pump (5) and the outlet of the second pump (6).
• 3 shows the section AA through the double peristaltic pump with motor (2), input of the first pump (3), the pressure rollers (7), common axis (8), roller guide (9) of the first pump, roller guide (10) of second pump, housing (11) and housing cover (12).
• 4 shows section BB through the second pump and section CC through the first pump with motor (2) and electrical connection (13), input of the first pump (3), output of the first pump (4), input of the second pump (5), the outlet of the second pump (6), pinch rollers (7), common axle (8), hose of the first pump (14) and hose of the second pump (15).

The arrangements of the inlets (3) and (5) and the outlets (4) and (6) of the double pump are shown here only as examples and can also be implemented in a different form and direction.

The arrangement of the pressure rollers (7) of the double pump is only shown here as an example. The opposing pressure rollers (7) of the first and second pump can be arranged axially aligned or offset, as shown in the example.

The number of pressure rollers (7) is only shown here as an example and can vary.

The pressure rollers (7) are each mounted on one side in the common axis (8) of the two and on the other side in a roller guide (9) for the first pump and a roller guide (10) for the second pump. The roller guides (9) and (10) are positively connected to the common axis (8). The individual parts of the double pump are enclosed by the housing (11) and the housing cover (12).

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 000003108129 A1 [0002]
• AT 000000367874 B [0002]
• DE 102020113267 A1 [0003]

Claims (5)

Double peristaltic pump with a free outlet according to the exemplary embodiment for dosing different liquids without using additional valves. Washing machine according to a double peristaltic pump claim 1 . Electrically operated dosing system with a double peristaltic pump according to claim 1 . Double peristaltic pump with a free outlet according to the exemplary embodiment with an integrated return flow stop. Double peristaltic pump with a closed outlet according to the exemplary embodiment with an integrated return flow stop.

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