EP4198262A2 - Pump for a filling machine with a bearing unit - Google Patents

Abstract

Pump (1) for a filling machine (100), in particular a vane pump, with- a delivery chamber (5) with a chamber floor (9) and an access opening (13) for providing access to the delivery chamber (5); - a direction a longitudinal axis (L) spaced from the chamber floor (9) arranged cover (11) for partially closing the access opening (13) in a closed state; - a rotatable about the longitudinal axis (L) in the pumping chamber (5) mounted rotor (7) ; and- a bearing unit (15) for axially bearing the rotor (7) in the direction of the longitudinal axis (L).The bearing unit (15) is rotatably mounted on the cover (11) and is set up to be non-rotatable with the rotor ( 7) to be coupled. The invention also relates to a storage unit (15) for such a pump (1) and a filling machine (100) with such a pump (1).

Description

The present invention relates to a pump for a filling machine, in particular a vane pump, having a delivery chamber with a chamber floor and an access opening for providing access to the delivery chamber; a lid spaced along a longitudinal axis from the chamber floor for partially enclosing the access opening in a closed condition; a rotor rotatably mounted in the conveying chamber about the longitudinal axis; and a bearing unit for axially supporting the rotor in the direction of the longitudinal axis. The present invention also relates to a storage unit for such a pump and a food processing machine, in particular a filling machine with such a pump.

Pumps of the above type are well known. Examples of such pumps are displacement pumps, such as rotary vane pumps or vane pumps. The pumping chamber of such pumps is mostly hollow-cylindrical and the rotor rotating therein is designed cylindrically corresponding to the pumping chamber. The longitudinal axis or the axis of rotation of the rotor is preferably arranged eccentrically to the axis of symmetry of the hollow-cylindrical delivery chamber, so that the rotor touches the inner wall of the delivery chamber between an inlet and an outlet opening. The rotor preferably comprises one or more, mostly Radially arranged guides for receiving rotary slides or vanes, which divide the space between the rotor and the pumping chamber into several chambers. In order to compensate for the changes in distance between the rotor and the wall of the pumping chamber during a revolution, the vanes can usually move in the guides. In order to clean the rotor and the vanes accommodated therein, these are usually arranged in a removable manner in the housing of the pump. In order to reduce wear on the rotor, it is arranged at a distance in the axial direction from the bottom of the pumping chamber and the cover of the pumping chamber in order to avoid accidental contact during operation.

For better disassembly, the rotor is usually detachably coupled in the axial direction to the housing of the pump or a drive shaft. A relative movement of the rotor in the axial direction along the longitudinal axis can therefore occur during operation. During operation, the "wandering" of the rotor along the longitudinal axis leads in particular to a reduction in the gap between the cover of the pumping chamber and the rotor, so that the rotor is exposed to increased and, in particular, uncontrolled friction in this area, which leads to wear and maintenance intervals only are insufficiently plannable.

In order to avoid a relative movement of the rotor in the direction of the longitudinal axis, it is known to connect the rotor to the drive shaft or the housing by means of a bolted connection in such a way that the rotor can be rotated about the longitudinal axis and at the same time is prevented from relative movement along the longitudinal axis. A disadvantage of these solutions is that the bolted connection must first be loosened in order to clean the rotor. After each cleaning process, it is therefore necessary for the operator to bring the rotor into engagement with the drive shaft or the housing again by means of said bolt connection. The cleaning process is therefore complex overall and the repeated assembly and disassembly of the screw or bolt connection is prone to failure with regard to assembly errors up to and including accidental omission of the fixation by the bolt connection. This is particularly problematic in the case of pumps for filling machines or filling machine pumps, since these have to be cleaned at least daily due to hygiene standards when processing food. Due to the frequent cleaning and the necessary dismantling of the screw or bolt connection, the risk of damage due to improper assembly is particularly high with such pumps, especially when processing food - i.e. as a filling machine pump. The corresponding filling machines are therefore highly prone to failure.

It is therefore the object of the present invention to specify a bearing for the rotor in the axial direction, which enables simple assembly and disassembly of the rotor and at the same time reduces and preferably completely prevents wear on the rotor.

The invention solves the underlying problem in a first aspect by a pump according to claim 1. In particular, the invention solves the problem in that the bearing unit is mounted rotatably on the cover and is set up to be non-rotatably coupled to the rotor in the closed state. The invention particularly relates to filling machine pumps for processing food. During operation, the longitudinal axis preferably extends in the vertical direction. Due to the fact that the bearing unit is mounted on the cover, the non-rotatable coupling with the rotor consequently only occurs when the supply opening is partially closed by the cover. Accordingly, when the cover is in an open state, there is no non-rotatable coupling of the rotor and the bearing unit.

Thus, due to the rotatable mounting of the bearing unit on the cover, there is a defined friction between the bearing unit and the cover, with the bearing unit being coupled to the rotor in a rotationally fixed manner in order to reduce the friction on the rotor. The wear of the rotor is thus reduced overall. By mounting the bearing unit on the cover, the set-up time or assembly time of the pump is reduced overall and, in particular, incorrect assembly is effectively avoided since the bearing unit no longer has to be continuously assembled and disassembled during operation. The rotor is held at a defined position in the direction of the longitudinal axis by the bearing unit mounted on the cover, so that a gap remains between the cover and the rotor and the overall friction between the two components is reduced. The bearing unit preferably has a low-friction contact surface with respect to the cover. The contact surface relative to the rotor is preferably formed such that a frictional coupling between of the bearing unit and a corresponding contact surface of the rotor is formed when the cover of the pumping chamber is closed. Furthermore, it is preferred that the bearing unit and the rotor are coupled in a frictional and/or positive manner, in particular by means of a claw coupling.

The rotor can be mounted on the cover directly or indirectly using other elements of the bearing unit, for example a spring mechanism or an interposed housing part. The bearing unit is preferably designed as a double-acting bearing unit for supporting the rotor in the axial direction.

According to a preferred embodiment, the cover is set up to partially close the access opening of the conveying chamber in the closed state, with the unclosed part of the access opening forming an inlet opening for feeding food products or pasty mass into the conveying chamber.

The cover preferably also has an inlet opening, through which foodstuffs, in particular pasty masses, can be introduced into the conveying chamber when the cover is closed. The inlet opening of the lid is therefore designed to provide access to the conveying chamber for feeding food, in particular pasty masses, into the conveying chamber when the lid is closed and is formed by an unsealed part of the access opening.

The inlet opening is preferably set up to cooperate with, in particular to be connected to, a funnel coupled to the housing for supplying the pasty mass.

In the context of the invention, a pasty mass is understood to mean a conveyable and preferably also a flowable medium, such as food masses of various types, for example sausage meat, minced meat, dough, cheese, vegan or vegetarian food masses or cosmetics as well as flowable or conveyable chemical substances and in particular Mixtures of liquids with solids of any kind.

According to a preferred embodiment, the bearing unit has a pressure piece and a spring mechanism that cooperates with the pressure piece, the spring mechanism being set up to apply a spring force acting in the direction of the chamber floor to the pressure piece, so that the rotor is kept at a distance from the cover. The rotor is reliably supported in the axial direction by a pressure piece and a cooperating spring mechanism, both of which are rotatably mounted on the cover and are coupled in a torque-proof manner to the rotor. Furthermore, tolerances in particular can be compensated for by the spring mechanism. Operational vibrations and forces occurring during operation can also be absorbed and compensated for by the spring mechanism, so that the rotor is mounted at a defined position in the direction of the longitudinal axis and a gap is formed between the rotor and the cover, which is essentially constant during operation or .does not fall below a predefined minimum.

According to a preferred embodiment, the pressure piece is designed to be rotationally symmetrical about the longitudinal axis, and the bearing unit also has a housing part that is designed to correspond and be coaxial with the pressure piece. The pressure piece is preferably guided radially and engages with the housing part in an axially displaceable manner. Like a separate housing part, which engages with the rotor, this can be replaced independently of the cover of the pumping chamber if necessary. The maintenance and repair costs are thus reduced overall. Furthermore, the housing part can have a low-friction surface coating, which can be used as required by the additional housing part. A housing part designed to correspond and be coaxial with the pressure piece represents a geometrically simple guidance of the pressure piece in the radial direction, which allows axial displacement, so that the spring mechanism preferably interacts with the housing part and the pressure piece in such a way that tolerances and forces in the axial direction are compensated can become.

More preferably, the bearing unit has an axial bearing, in particular an axial bearing acting on both sides, for rotatably mounting the pressure piece on the cover and/or the housing part. Thus, the pressure piece is securely mounted in the axial direction on the cover and / or the housing part and the friction on a defined amount limited. This means that the service life of the pressure piece and the necessary maintenance intervals can be planned more easily.

The rotor can be mounted on the cover and/or housing part directly or indirectly using other elements of the bearing unit, for example a spring mechanism or an interposed component.

More preferably, the bearing unit has a radial bearing for rotatably mounting the pressure piece on the cover and/or the housing part. The pressure piece is thus securely mounted in the radial direction and is thus held in a defined position, with the friction being limited to a defined level by the provision of a bearing. The service life and maintenance intervals can therefore be planned better compared to pumps in which unwanted friction occurs between the components.

According to a further preferred embodiment, the bearing unit has a seal which is arranged coaxially to the longitudinal axis and is arranged between the cover and the housing part. Furthermore, a second seal can also preferably be arranged between the cover and the pressure piece as an alternative or in addition to the first seal. The conveying chamber is thus reliably sealed and foodstuffs are prevented from escaping unintentionally between the cover and the housing part or between the cover and the pressure piece.

The pressure piece is preferably of cylindrical design and the bearing unit has a guide arranged between the pressure piece and the housing part, in particular a plain bearing guide which is designed to guide the pressure piece radially. Thus, the pressure piece is reliably guided in the radial direction.

In embodiments with a seal between the pressure piece and the housing part, the seal is assigned to the housing part or the pressure piece and is in particular connected to it. Thus, the seal is stationary in relation to the thrust piece when the seal is associated with the housing part. If, on the other hand, the seal is assigned to the pressure piece, the seal rotates about the longitudinal axis together with the pressure piece during operation of the pump. According to a preferred embodiment, the spring mechanism has at least one in the direction of the longitudinal axis reversibly deformable element for applying a spring force to the pressure piece. The spring force can thus be matched to the forces occurring during operation by selecting a suitable material.

According to a further preferred embodiment, the reversibly deformable element comprises at least one spring, in particular a spiral spring, and the spring mechanism also has at least one receptacle for the spring that is designed to correspond to the spring. The spring is preferably accommodated in the receptacle such that it can move in the direction of the longitudinal axis and is supported in the radial direction. A spring of this type is a simple, inexpensive standard component that can be replaced if necessary. A corresponding receptacle ensures reliable guidance and support of the spring.

According to an alternative preferred embodiment, the reversibly deformable element comprises a cup spring or an elastomer spring. The cup spring or elastomer spring can preferably be accommodated in a corresponding receptacle so that it can move in the direction of the longitudinal axis L.

According to a further preferred embodiment, the pump also comprises a gear bearing and a drive shaft, which is preferably detachably engaged with the gear bearing and/or the gear in the direction of the longitudinal axis and is coupled to the rotor so that it can rotate. The rotor can thus preferably be dismantled in a simple manner for cleaning purposes. The detachable coupling of the drive shaft to the transmission bearing and/or the transmission preferably allows the position of the drive shaft and the rotor coupled to it to be adjusted in the direction of the longitudinal axis in such a way that the drive shaft and the rotor are in a first position and at least one further position in the direction the longitudinal axis can be mounted. A gap can thus be set between the rotor and the bottom of the conveying chamber and wear and tear due to friction of the rotor on the chamber bottom can be reliably avoided.

According to a second aspect, the invention relates to a pump for a food processing machine, in particular a vane pump, having a delivery chamber with a chamber floor and an access opening for providing access to the delivery chamber, spaced apart in the direction of the longitudinal axis the cover arranged on the chamber floor for the particular partial closing of the access opening in a closed state; a rotor rotatably mounted in the conveying chamber about the longitudinal axis; and a bearing unit for axially supporting the rotor in the direction of the longitudinal axis. The invention solves the underlying object according to the second aspect in that the bearing unit has a pressure piece and an axial bearing, in particular a double-sided axial bearing, for rotatably mounting the pressure piece on the cover and/or a housing part coupled to the cover and in that the Bearing unit has a radial bearing, in particular a double-acting radial bearing, for rotatably mounting the pressure piece on the cover and/or the housing part. By providing an axial bearing and a radial bearing, the friction caused by the rotation of the rotor about the longitudinal axis on the cover of the pumping chamber is limited to a defined level. It is preferably a roller or cylindrical roller bearing, so that only rolling friction prevails. This promotes less wear and ensures better planning of maintenance intervals.

The rotor can be mounted on the cover and/or housing part directly or indirectly using other elements of the bearing unit, for example a spring mechanism or an interposed component.

According to a third aspect, the invention relates to a bearing unit for a pump, in particular a pump according to the first or second aspect of the invention, the pump having a delivery chamber with a chamber floor and an access opening for providing access to the delivery chamber, one spaced apart in the direction of a longitudinal axis has a cover arranged on the chamber floor for in particular partially closing the access opening in a closed state and a rotor which is mounted in the delivery chamber so that it can rotate about the longitudinal axis, the bearing unit being set up for axially mounting the rotor in the delivery chamber of the pump in the direction of the longitudinal axis. The underlying object is achieved according to the third aspect of the invention in that the bearing unit is set up and designed for rotatable mounting on the cover and is also set up and designed for non-rotatable coupling to the rotor in the closed state and/or in that the Bearing unit, an axial bearing for rotatably supporting the pressure piece on the cover and/or a housing part coupled to the cover and in that the bearing unit has a radial bearing for rotatably mounting the pressure piece on the cover and/or the housing part.

The rotor can be mounted on the cover and/or housing part directly or using other elements of the bearing unit, for example a spring mechanism or an interposed component.

The bearing unit according to the invention according to the third aspect for a pump according to the first or second aspect adopts the advantages of the same. Preferred embodiments of the pump according to the first or second aspect are also preferred embodiments of the bearing unit for such a pump according to the third aspect.

The invention preferably also relates to the use of a bearing unit according to the third aspect of the invention in a pump according to the first or the second aspect of the invention.

In a fourth aspect, the invention relates to a filling machine, with a pump according to the first or second aspect of the invention, a hopper connected to the pumping chamber of the pump in a fluid-conducting manner for feeding the pasty foodstuff into the pumping chamber, and a delivery unit connected to the pumping chamber of the pump in a fluid-conducting manner for Discharging the pasty food from the conveying chamber.

By the pump according to the first or second aspect of the invention, the filling machine enjoys the advantages described above. Preferred embodiments of the pump according to the first or second aspect of the invention are also preferred embodiments of the filling machine according to the fourth aspect of the invention.

Figur 1:

zeigt eine Nahrungsmittelmaschine schematisch in einer teilgeschnittenen Ansicht,

Figur 2:

eine erfindungsgemäße Pumpe in einer Schnittansicht gemäß einer ersten bevorzugten Ausführungsform,

Figur 3:

zeigt eine erfindungsgemäße Pumpe in einer Schnittansicht gemäß einer zweiten bevorzugten Ausführungsform, und

Figur 4:

zeigt eine erfindungsgemäße Pumpe in einer geschnittenen Ansicht gemäß einer dritten bevorzugten Ausführungsform.

Preferred exemplary embodiments of the invention are described below with reference to the attached figures.

Figure 1:

shows a food processing machine schematically in a partially sectioned view,

Figure 2:

a pump according to the invention in a sectional view according to a first preferred embodiment,

Figure 3:

shows a pump according to the invention in a sectional view according to a second preferred embodiment, and

Figure 4:

shows a pump according to the invention in a sectional view according to a third preferred embodiment.

The filling machine 100 according to FIG figure 1 comprises a pump 1 for conveying a pasty mass, a hopper 2 for feeding the pasty mass to the pump 1 and a discharge unit 3 for dispensing the pasty mass conveyed by the pump 1. The pump 1 is arranged in a housing 4 of the filling machine 100 .

The pump 1 comprises a pumping chamber 5 in which a rotor 7 is rotatably mounted about a longitudinal axis L. A number of vanes 8 are preferably coupled to the rotor 7 and are designed to convey a pasty mass through the conveying chamber 5 . The conveying chamber 5 preferably has an access opening 13 on the side of the funnel 2 . The delivery chamber 5 preferably also has an outlet opening 6 on the side of the dispensing unit 3 . The outlet opening is designed to cooperate with the dispensing unit 3 . The conveying chamber 5 comprises a chamber floor 9, with a gap 9a being formed between the rotor 7 and the chamber floor 9.

The pump 1 also includes a cover 11 for partially closing the access opening 13. The access opening 13 is designed to provide access for maintenance, cleaning and disassembly of the rotor 8, for example. An unclosed area of the access opening 13 forms an inlet opening 14 which is set up to cooperate with the funnel 2 for feeding pasty mass into the conveying chamber 5 . The inlet opening 14 is preferably formed in the cover 11 . Between the lid 11 and the rotor 7 is a gap 11a is formed. The pump 1 also has a bearing unit 15 for bearing the rotor 7 on the cover 11 .

The Figures 2 to 4 show various exemplary embodiments of the pump 1 according to the invention.

As in figure 2 shown, the pump 1 comprises a pumping chamber 5 which is formed in a housing 4 . A rotor 7 is rotatably mounted about a longitudinal axis L in the delivery chamber 5 . At least one vane 8 is preferably coupled to the rotor 7, which rotates together with the rotor 7 about the longitudinal axis L and is designed to divide the conveying chamber 5 into individual cells, in which the pasty mass to be conveyed can be transported.

The delivery chamber 5 is preferably designed eccentrically with respect to the rotor 7 . The vanes 8 are in engagement with the rotor 7 so as to be movable in the radial direction in order to be guided along the inner wall of the pumping chamber 5 .

The conveying chamber 5 has a chamber floor 9 , a gap 9 a being formed between the chamber floor 9 and the rotor 7 . The pump 1 also has a cover 11 which is designed to close an access opening 13 of the pumping chamber 5 . A gap 11a is formed between the cover 11 and the rotor 7 .

The pump 1 also has a bearing unit 15 for bearing the rotor 7 in the axial direction in the pumping chamber 5 .

The bearing unit 15 preferably has a pressure piece 17 which is rotatably mounted on the cover 11 and is preferably coupled to the rotor 7 in a form-fitting and/or friction-fitting manner. The pressure piece 17 engages with a housing part 21 in such a way that it can be moved in the direction of the longitudinal axis L. The rotor 7 is rotatably coupled to a drive shaft 25 and rests on it in a contact area 26 . The drive shaft 25 extends into a transmission area that is not shown in more detail and is supported by a transmission bearing 23 . The gear bearing 23 preferably comprises an axial bearing 23a and/or a radial bearing 23b.

One or more seals 33 and one or more radial bearings 31 are preferably provided between the housing 4 and the drive shaft 25 . The drive shaft 25 can preferably be coupled directly or indirectly to the housing 4 at a first and at least one further position along the longitudinal axis L, so that the respective gap 9a and/or gap 11a can be adjusted in each case by positioning the drive shaft 25. As a result, a minimum dimension for the gap 9a between the chamber floor 9 and the rotor 7 can be ensured by setting the drive shaft 25. If the rotor 7 and possibly also the drive shaft 25 move further in the direction of the cover 11 during operation, the bearing unit 15 prevents the rotor 7 from moving too far in the direction of the cover 11 through the pressure piece 17 and the corresponding design of the pressure piece 17 Housing part 21. The housing part 21 is preferably movably engaged with the pressure piece 17. The described mounting of the pressure piece 17 allows friction to a controlled extent, so that maintenance intervals can be planned and the remaining service life can be calculated.

The pressure piece 17 is preferably mounted on the cover 11 in the radial direction by means of a radial bearing 31 . Furthermore, the pump 1 preferably has a seal 33 between the pressure piece 17 and the cover 11 . This reliably prevents the pasty mass from escaping from the conveying chamber 5 and, conversely, the penetration of, for example, gear oils or greases into the conveying chamber.

The housing part 21 is preferably coupled to the cover 11 in a rotationally fixed manner and is arranged in a recess 41 of the cover 11 that is designed to correspond to the housing part 21 .

In the figure 3 Pump 1 shown differs from that in figure 2 shown embodiment of the pump by the formation of the bearing unit 15. With regard to the same components, the same reference numerals are used and reference is made to the previous descriptions of FIG figures 1 and 2 referenced.

In this exemplary embodiment, the bearing unit 15 also has a spring mechanism 19 .

The spring mechanism 19 comprises a deformable element 37 which, as in FIG figure 2 shown embodiment is preferably a spiral spring 37. The spiral spring 37 is accommodated in a correspondingly designed receptacle 39 of the bearing unit 15 . The spiral spring 37 is thus guided in the radial direction and movement of the spiral spring 37 in the direction of the longitudinal axis L is permitted.

The receptacle 39 is preferably closed on the cover side by a housing part 21 , the pressure piece 17 or the housing part 21 preferably being mounted on the cover 11 by means of an axial bearing 29 . The pressure piece 17 is also preferably mounted in the radial direction on the cover 11 by means of a radial bearing 31 .

Furthermore, a seal 33 is arranged at a distance from the radial bearing 31 and adjacent to the delivery chamber 5, which is set up to separate the delivery chamber 5 from the access opening 13 of the cover 11 in a fluid-tight manner.

The spring mechanism 19 is set up to apply a force acting in the direction of the longitudinal axis L to the rotor 7 by means of the spiral spring 37 . The spring force must be large enough and the spiral spring 37 must be adjusted accordingly in order to compensate for the forces occurring during operation in the direction of the longitudinal axis L and in particular the forces acting in the direction of the cover 11 . The gap 11a is ensured during operation of the pump 1 by the spring force.

As in relation to the previous embodiment according to figure 2 described, the drive shaft 25 can be mounted on the housing 4 at a first and at least one further position by means of the gear bearing 23 . The gear bearing 23 preferably comprises an axial bearing 23a and/or a radial bearing 23b.

This in figure 4 shown embodiment of the pump 1 according to the invention differs from the previously in the figures 2 and 3 illustrated embodiments by the formation of the bearing unit 15. With regard to the same components, the same reference numerals are used and reference is made to the previous descriptions of FIG figures 2 and 3 referenced and.

The bearing unit 15 has a spring mechanism 19 which is set up to apply a spring force acting in the direction of the drive shaft 25 to the pressure piece 17 . The drive shaft 25 is supported by a gear bearing (not shown).

The pressure piece 17 is rotatably mounted on a housing part 21 by means of a radial bearing 31, which is preferably a sliding bearing. In the exemplary embodiment shown, the pressure piece 17 has a number of receptacles 39 for receiving a corresponding number of elastic elements 37, which are preferably designed as springs. The housing part 21 has a shape corresponding to the pressure piece 17 and is mounted on the cover 11 , a seal 33 being arranged between the pressure piece 17 and the cover 11 . In particular, the seal 33 is arranged adjacent to the housing part 21 .

The housing part 21 preferably forms at least part of the receptacle 39 for the springs 37 . The housing part 21 and the pressure piece 17 are preferably designed to be rotationally symmetrical about the longitudinal axis L.

The pressure piece 17 is preferably mounted on the housing part 21 by means of an axial bearing 29 . The axial bearing 29 is preferably a roller bearing. Thus, there is a defined friction between the pressure piece 17 and the housing part 21, so that the wear can be calculated and maintenance intervals can be planned.

For easier handling, the housing part 21 is coupled to the pressure piece 17 by means of a bolt connection, preferably a screw connection with a screw 27 . The screw 27 can be moved together with the pressure piece 17 relative to the housing part 21 in the direction of the longitudinal axis L. Thus, an unintentional release of the storage unit 15 when opening the cover 11 is effectively avoided.

A guide 36 is preferably arranged between the pressure piece 17 and the housing part 21 and is set up to guide the rotation of the pressure piece 17 along an inner circumference of the housing part 21 .

In the area of the cover 11 , the housing 4 has a recess 41 designed to correspond to the bearing unit 15 . The bearing unit 15 can be introduced into this recess 41 and is preferably mounted and guided on the cover 11 and/or the recess 41 .

Reference List

1

pump

2

funnel

3

output unit

4

Housing

5

conveyor chamber

6

outlet

7

rotor

8th

wing

9

chamber floor

9a

gap on the floor

11

Lid

11a

gap in the lid

13

access opening

14

intake port

15

storage unit

17

Pressure piece

19

spring mechanism

21

housing part

23

gear bearing

23a

Transmission bearing thrust bearing

23b

Transmission bearing radial bearing

25

drive shaft

26

contact area

27

screw

29

thrust bearing

31

radial bearing

33

poetry

36

guide

37

deformable element, spring, spiral spring

39

Recording

41

recess

100

filling machine

L

longitudinal axis

Claims (15)

Pump (1) for a filling machine (100), in particular a vane pump - A conveying chamber (5) with a chamber floor (9) and an access opening (13) for providing access to the conveying chamber (5); - A cover (11) arranged at a distance from the chamber floor (9) in the direction of a longitudinal axis (L) for partially closing the access opening (13) in a closed state; - A rotatable about the longitudinal axis (L) in the pumping chamber (5) mounted rotor (7); and - a bearing unit (15) for axially bearing the rotor (7) in the direction of the longitudinal axis (L), characterized in that the bearing unit (15) is rotatably mounted on the cover (11) and is set up to be coupled to the rotor (7) in a rotationally fixed manner in the closed state. Pump (1) according to claim 1, the bearing unit (15) having a pressure piece (17) and a spring mechanism (19) cooperating with the pressure piece (17), wherein the spring mechanism (19) is set up to apply a spring force acting in the direction of the chamber floor (9) on the pressure piece (17), so that the rotor (7) is held at a distance from the cover (11). Pump (1) according to claim 2,
the pressure piece (17) being rotationally symmetrical about the longitudinal axis (L) and the bearing unit (15) also having a housing part (21) designed to correspond and be coaxial with the pressure piece (17), the pressure piece (17) being radially guided and axially displaceable is in engagement with the housing part (21). Pump (1) according to one of claims 2 or 3, wherein the bearing unit (15) has an axial bearing (29) for rotatably mounting the pressure piece (17) on the cover (11) and/or the housing part (21), and/or wherein the bearing unit (15) has a radial bearing (31) for rotatably mounting the pressure piece (17) on the cover (11) and/or the housing part (21). Pump (1) according to one of claims 1 to 4, wherein the cover (11) has an inlet opening (14) which is set up for feeding the pasty mass into the conveying chamber (5) when the cover (11) is in the closed state, and/or a or the inlet opening (14) being arranged to cooperate with a hopper (2) coupled to the housing (3) for feeding the pasty mass. Pump (1) according to one of claims 2 to 5,
wherein the bearing unit (15) has a seal (33) which is arranged coaxially to the longitudinal axis (L) and which is arranged between the cover (11) and the housing part (21) and/or the pressure piece (17). Pump (1) according to one of claims 2 to 6,
the pressure piece (17) being cylindrical and the bearing unit (15) having a guide (36) arranged between the pressure piece (17) and the housing part (21), in particular a plain bearing guide, which is set up to guide the pressure piece (17) radially. Pump (1) according to any one of claims 2 to 7,
wherein the spring mechanism (19) has at least one element (37) that is reversibly deformable in the direction of the longitudinal axis (L) for applying a spring force to the pressure piece (17). Pump (1) according to claim 8, wherein the reversibly deformable element (37) comprises at least one spring (37), in particular a spiral spring, and the spring mechanism (19) further has at least one receptacle (39) for the spring (37) designed to correspond to the spring (37), wherein the spring (37) is accommodated in the receptacle (39) so as to be movable in the direction of the longitudinal axis (L) and is supported in the radial direction. Pump (1) according to claim 8,
wherein the reversibly deformable element (37) is a spring (37), in particular a disk spring or an elastomer spring, and the spring mechanism (19) preferably also has a receptacle (39) for the spring (37) designed to correspond to the spring (37). . A pump (1) according to any one of the preceding claims, further comprising - a gear bearing (23), and - A drive shaft (25) which engages with the gear bearing (23) and is rotatably coupled to the rotor (7). Pump (1) according to claim 11,
wherein the drive shaft (25) can be brought into engagement with the transmission bearing (23) and/or the transmission in the direction of the longitudinal axis (L) at a first and at least one second position, depending on the position of the drive shaft (25) in the direction a gap (9a) between the rotor (7) and the chamber floor (9) can be adjusted along the longitudinal axis (L). Pump (1) for a filling machine (100), in particular a vane pump - A conveying chamber (5) with a chamber floor (9) and an access opening (13) for providing access to the conveying chamber (5); - A cover (11) arranged at a distance from the chamber floor (9) in the direction of a longitudinal axis (L) for partially closing the access opening (13) in a closed state; - A rotatable about the longitudinal axis (L) in the pumping chamber (5) mounted rotor (7); and - a bearing unit (15) for axially bearing the rotor (7) in the direction of the longitudinal axis (L), characterized in that the bearing unit (15) has a pressure piece (17) and an axial bearing (29) for rotatably mounting the pressure piece (17) on the cover (11) and/or a subassembly cooperating with the cover (11), and that the bearing unit (15) has a radial bearing (31) for rotatably mounting the pressure piece (17) on the cover (11) and/or on a housing part (21) coupled to the cover (11). Bearing unit (15) for a pump, in particular a pump (1) according to one of Claims 1 to 13, the pump (1) comprising: - A conveying chamber (5) with a chamber floor (9) and an access opening (13) for providing access to the conveying chamber (5); - A cover (11) arranged at a distance from the chamber floor (9) in the direction of a longitudinal axis (L) for partially closing the access opening (13) in a closed state; and - A rotatable about the longitudinal axis (L) in the pumping chamber (5) mounted rotor (7); wherein the bearing unit (15) is set up for axially bearing the rotor (7) in the direction of the longitudinal axis (L), characterized in that the bearing unit (15) is rotatably mounted on the cover (11) and is set up to be coupled to the rotor (7) in a rotationally fixed manner in the closed state, and/or characterized in that the bearing unit (15) has a pressure piece and an axial bearing (29) for rotatably mounting the pressure piece (17) on the cover (11) and/or on a housing part (21) coupled to the cover (11), and that the bearing unit (15) has a radial bearing (31) for rotatably mounting the pressure piece (17) on the cover (11) and/or the housing part (21). Filling machine (100) comprising: - A pump (1) according to any one of the preceding claims for conveying a pasty mass, - a housing (4) in which the pump (1) is arranged, - a hopper (2) coupled to the housing (4) for feeding the pasty mass to the pump (1), and - A dispensing unit (3) for dispensing the pasty mass conveyed by the pump (1).

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