EP1574717B1 - Pump - Google Patents

Description

The present invention relates to the field of cleaning pumps for liquids, for example foodstuffs, more particularly milk. Such pumps are known from the state of the art, in particular by German patents DE10043668 or DE20313360 , or the US patent application US2004 / 011647 or the English patent GB852580 .

So the document DE10043668 discloses a liquid pumping system that includes an envelope connected to a pressure pipe. The envelope acts as a filter that encapsulates a pumping element that is connected to the pressure pipe. A suction port in the casing of the pumping system is connected to the second pumping element.

The document DE20313360 also discloses a liquid pump which comprises a housing, a suction connection with which is associated a suction zone located on a housing part, said suction zone being provided with through slots, a pressure connection being in communication fluidic with the suction connection via a pumping device in the housing, a motor for driving the pumping device and a control device for controlling the pumping device and the motor. The suction connection is further associated with a suction tube which is movably mounted relative to the suction connection such that a suction volume of the suction connection can be distributed over the suction tube. and the suction zone.

The purpose of the invention is to provide liquid pumps with arrangements to prevent them from rotating during the washing phases. It is thus possible to have no automatons or special installations, especially in washing station, so as to allow the rotation of the pumps during washing.

This object is achieved thanks to a pump comprising two lateral grooves on the front and rear faces of the pump body with low and high internal communication between these two grooves.

Advantageously, the low and high internal communication is in the form of two communication grooves between said lateral grooves.

Preferably, said low and high internal communication connects the lateral grooves with the inlet and the liquid outlet.

The invention particularly relates to centrifugal pumps, but the above arrangement can be applied to any other type of pump suitable for this type of development, such as MGM35 pumps.

The invention also relates to the manufacture of the above pumps consisting of arranging two lateral grooves on the front and rear faces of the pump body with a low and high internal communication between these two grooves.

The invention also relates to a device comprising several pumps of the type described above.

The invention is particularly suitable for providing an efficient pump washing means in dairies, where both pumps and pipes and tanks must be cleaned after each use.

• La figure 1 représente une vue générale d'un système de pompage duplex avec ses organes de lavage.
• Les figures 2 et 3 représentent une vue en coupe d'une pompe munie de l'aménagement selon l'invention.

Other advantages and characteristics of the invention will emerge from the examples below, where reference will be made to the appended drawings in which:

• The figure 1 represents a general view of a duplex pumping system with its washing members.
• The Figures 2 and 3 represent a sectional view of a pump provided with the arrangement according to the invention.

The figure 1 is a general view of a duplex pumping system comprising two pumps (100, 200), a centrifugal pump (100) and a pump (200).

The system includes a first circuit comprising an inlet conduit (101) opening into the inlet end (102) of the centrifugal pump (100). The output of the pump (100) opens into a conduit (103) communicating with the main output (104) of the system, as well as with a secondary conduit (201) opening into the inlet of the pump (200).

The primary circuit comprises a non-return valve (105).

The output of this pump (200) is connected to the output of the pumping system through a conduit (202).

The secondary circuit comprises a non-return valve (203).

The output (103, 104) of the main circuit includes purge outputs controlled by purge valves (2, 4).

Similarly, the secondary circuit also comprises purge outputs controlled by valves (1, 3, 5, 6).

During pumping, the valves (1, 2) and all purge valves (3, 4, 5, 6) are closed. Then during the washing, the valves (1, 2) are opened so as to allow the entry and exit of the cleaning liquid, for example consisting of hot water and sodium hydroxide, and all the purge taps (3 , 4, 5, 6). After washing, all the purge valves (3, 4, 5, 6) are reopened.

The Figures 2 and 3 represent sectional views of a centrifugal pump that can be implemented in the system of the figure 1 . This pump comprises two lateral grooves (7, 8) and a low and high internal communication in the form of two communication grooves (9, 10) between said lateral grooves (7, 8).

Claims (4)

1. A pumping system comprising two pumps (100, 200), one of the pumps having two side grooves, a groove on the front face (7) and a groove on the back face (8) of the pump body with a bottom and top inner communication between these two grooves (7, 8), characterised in that the top communication connects the side grooves (7, 8) to each other and with the liquid inlet (102), the bottom inner communication connecting the side grooves (7, 8) with the liquid outlet (103).
2. The pumping system according to claim 1, characterised in that the top inner communication is in the form of a top communication groove (9) between said side grooves (7, 8) and the bottom inner communication is on the form of a bottom communication groove (10) between said side grooves (7, 8).
3. The pumping system according to any of claims 1 or 2, characterised in that it is of the centrifugal type.
4. A device comprising several identical or different pumps according to any of claims 1 to 3.

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