EP2626563A2 - Pump, recirculating device for a pump and rotor shaft for a pump - Google Patents

Abstract

The pump (1) has a pump rotor (4) rotatably supported around a rotational axis (A) in a pump stator (3) in an operating state, and a rotor shaft (5) arranged in a shaft feedthrough (6) such that a lubricating film of a lubricating fluid is formed in a ring gap between the shaft and the feedthrough. A separation device (7) is arranged at the shaft for separating a predefinable quantity of an ingredient from pump fluid (2) by centrifugal force for providing the lubricating fluid to the gap. A recirculation device (8) is arranged such that gas (201) is recirculated with the separation device. The separation device is designed as a separation disk.

Description

The invention relates to a pump for conveying a pumping fluid in the form of a multiphase mixture and to a recirculation device for a pump according to the preamble of the independent claims 1 and 15.

In the prior art, it is a well-known measure to separate ingredients of the pumping fluid by means of the rotating parts of pumps and to lubricate the pump or throttles, ie annular seals, with the separated medium itself, which has the obvious advantage that then for these lubricating applications no special lubricant needs to be provided. This may be of particular advantage especially if the provision of the lubricant, for example for the lubrication of a rotary rotor shaft of the pump carrying a pump rotor, is possible only with particular difficulty. Another advantage is that it is possible to dispense with a shaft seal on the non-drive side through the use of a self-lubricating or product-lubricated bearing, since the shaft no longer has to be led out to the atmosphere. Prominent examples include a variety of other applications pumps for the promotion of multi-phase mixtures, such as to promote crude oil. Such pumps often need to be operated in very inaccessible locations, often many hundreds of meters, even up to a few thousand meters below the sea surface where the pumps are must be operated reliably under extreme conditions for considerable periods of time.

However, a problem that has been solved only insufficiently occurs in the promotion of such pumping media, such as in a multi-phase mixture, which in addition to petroleum, natural gas and often water and especially harmful solid components such. Contains sand. The additional ingredients are often harmful to the lubrication application. So the expert understands immediately that, for example, especially hard ingredients such as sand can affect the lubrication massive negative. For example, if a lubricant contaminated with sand is used to lubricate a rotor shaft of an impeller, the sand in the lubricant can cause considerable damage to the parts to be lubricated, because the hard sand grains damage the surfaces of the components to be lubricated, which are often made of relatively soft metal which can eventually lead to failure of the pump.

Therefore, it is known in the prior art, such parts to be lubricated, for example, with a sand-contaminated lubricant, especially to harden so that the sand contained in the lubricant can not damage the surfaces, or at least as far as the wear of the corresponding parts reduce, that reasonably long service life, so economically reasonable maintenance intervals can be achieved.

In this case, the hardening of the corresponding parts, such as the rotor shaft of an impeller of the pump or the rotor shaft bearing form static or rotating counterpart and bearing components, of course, a measure that is on the one hand very complex and therefore expensive and ultimately does not solve the problem actually because even Hardened parts with time of rubbing load, for example by sand contained in the lubricant, can not withstand long term. Another point is that, for example, the The width of the lubricant gaps between the rotating and / or static parts of the bearings often can not be reduced to the desirable level, because otherwise the harmful influence of hard, non-compressible ingredients such as sand would be so large that premature wear of the corresponding bearing would be inevitable. The fact that the bearing gaps are not optimally adjustable by such restrictions, the smoothness of the stored parts can be adversely affected, and not optimally adjusted lubricant gaps can cause harmful vibrations in the operating state, which ultimately can also lead to premature wear.

Another from the EP12154903.4 known device provides to separate the pumping fluid by means of a separation device. The liquid and solid ingredients of the pumping fluid are separated from each other and the liquid components used as a lubricant for lubricating rotating parts of the pump, in particular for the lubrication of the rotor shaft of the pump rotor.

Disadvantage of the device described is that only solid or liquid ingredients can be deposited, although gaseous ingredients adversely affect the lubricating behavior of the lubricant, because, for example, the viscosity, ie the viscosity of the pump fluid used as a lubricant for use as a lubricant poorly or not at all suitable is.

The object of the invention is therefore to propose a pump for delivering a pumping fluid in the form of a multiphase mixture, wherein the pumping fluid can be used simultaneously for lubricating rotating parts of the pump, in particular for lubricating the rotor shaft of the pump rotor, wherein the known from the prior art harmful influences of the ingredients on the lubrication process are largely avoided.

The objects of the invention that solve this object are characterized by the features of independent claims 1 and 14.

The dependent claims relate to particularly advantageous embodiments of the invention.

The invention thus relates to a pump for delivering a pumping fluid in

Form of a multi-phase mixture, wherein in the operating state provided under an input pressure at a low pressure side of the pump pump fluid is conveyed by means of a rotatably mounted in a pump stator about a rotation axis pump rotor to a high pressure side of the pump, and a rotor shaft is arranged in such a shaft passage that between the Rotor shaft and the shaft passage in an annular gap, a lubricant film from a fluid formed from the pumping fluid can be formed, and on the rotor shaft, a separation device is provided, with which in the operating state to provide the lubricating fluid at the annular gap a predetermined amount of an ingredient by means of a centrifugal force separated from the pumping fluid is. According to the invention, a recirculation device is provided so that a gas can be recirculated with the aid of the separation device.

It is thus essential for the invention that a recirculation device is provided, with which a specifiable amount of a gas, in practice frequently natural gas, can be recirculated in the operating state. The gas, which is separable from the pumping fluid, is essentially separated from the pumping fluid by means of the separation device and in particular by means of the centrifugal force acting in the separation device. For this purpose, the pumping fluid to be pumped by the pump may be a multiphase mixture comprising crude oil loaded with sand and natural gas, which is conveyed from a raw source through the pump into a collective storage, for example. The pumping fluid is in the rotating separation device acting there due to the rotation Subjected to centrifugal forces. Due to the higher density of the sand compared to the liquid and gaseous portion of the pumping fluid, wherein the gaseous fractions in turn have a lower density than the liquid portions, accumulate the sand under the effect of centrifugal force at the outer edge, the liquid fractions in the middle and the gaseous components in the interior, for example in an annular chamber of the separation device on. Another cause for the separation of the gas from the pumping fluid is, for example, the pressure difference between the recirculation device and the high pressure side of the pump. In this case, the pumping fluid flows from the high-pressure side of the pump to the recirculation device, ie in the direction of a gas bank, where the gas is separated from the pumping fluid and from there flows in a certain direction, preferably in the direction of the high-pressure side of the pump.

As a result, a highly enriched in gas phase of the pumping fluid is formed in the interior of the annular chamber, which is preferably discharged by means of a recirculation device according to the invention back to the high pressure side of the pump and non-gas enriched pumping fluid for lubrication, e.g. the rotor shaft is used. The removal of the lubricating fluid to be used for the lubrication, takes place at a further outward diameter of the annular chamber of the separation device, where a phase of the pumping fluid has accumulated with low gas and sand concentration. A highly enriched with sand phase of the pumping fluid forms at the outer edge of the annular chamber of the separation device and is discharged from there via a corresponding Abscheideleitung preferably back to the low pressure side of the pump and not for lubrication, e.g. the rotor shaft used.

It goes without saying that can be separated in this way any ingredients of the pumping fluid having the corresponding density differences with the separation device and the gaseous components with the Recirculation means are preferably recirculated to the high pressure side, so that for example the proportion of the pumping fluid to be used for lubrication, has a predetermined suitable viscosity, which is not too high or too low, because gaseous components with the recirculation means and with the aid of the separation device are removable.

Thus, it is possible for the first time by the present invention, not only solid or liquid ingredients but also gaseous ingredients that adversely affect the lubrication behavior, so abzuseparieren of the pumping fluid to be pumped and recirculate by means of the recirculation, the one of ingredients sufficiently purified phase the pumping fluid is provided, which can be used for lubrication of rotating parts of the pump, wherein the well-known from the prior art harmful influences of the ingredients are minimized to the lubrication process. In this case, depending on the precise composition and consistency of the pumping fluid or the ingredients, also, for example, mixing or solution phenomena may be relevant, which further positively influence the process of recirculation. Thus, it is possible, for example, that gas fractions are dissolved in higher viscoses and / or in higher density fluid constituents or are enclosed, for example, in the form of bubbles and thus likewise separated off and recirculated by the recirculation device according to the invention. Of course, other processes known per se can contribute to the fact that not only components of lower density but also those of higher density can be deposited via the recirculation device, because they are entrained by the components of higher density.

As a special measure, the shaft passage forms a shaft bearing and comprises a stationary bushing and a rotating shaft sleeve, wherein the annular gap between the stationary bushing and the rotating Shaft sleeve is formed. In particular, the shaft passage advantageously forms a throttle point.

The advantage of this measure is that the throttle points, ie annular seals, which serve to separate pressure stages, constantly lubricate and stabilize the rotor and serve the pressure separation, so that the rotor is constantly lubricated during its circulating movement only with liquid.

The recirculation device comprises a supply line, a recirculation line and a means for increasing the pressure, in particular a screw conveyor and / or a corrugated line. In a particularly preferred embodiment for practice, for example, the means for pressure increase in the recirculation line, ie the line is inside partially or completely fluted and / or has a screw conveyor, so, as the skilled artisan immediately understands, the pressure in the recirculation line, similar the effect of a throttle, is increased above the pressure of the high pressure side of the pump or a Gassenke. In addition, the recirculation means for supplying the pumping fluid into the recirculation means by means of a supply line to the high pressure side of the pump is fluidly connected, so that the pumping fluid flows in the operating state of the high pressure side of the pump to the recirculation device. For recirculation of the gas, the recirculation device is flow-connected via a recirculation line to the high-pressure side of the pump and / or a gas bank. The recirculation line is designed such that by means of the means for pressure increase, a pressure in the recirculation line higher than on the high pressure side of the pump and / or Gassenke can be produced and the gas from the recirculation device to the high pressure side and / or the Gassenke is conveyed, said for example, an area for collecting the gas, a gas collecting container, or a conduit which directs the gas into an area outside the pump is to be understood, for example.

The recirculation device is designed as an integral part of the pump. The supply and recirculation can be, for example, an integral part of the pump housing, in particular a running in the pump housing or pump stator or shaft passage bore or hole-like connection opening, or be realized by separate lines, the high pressure side with the recirculation device and / or the separation chamber connect.

In particular, the separation device co-rotating with the rotor shaft about the axis of rotation comprises an annular chamber to which annular chamber for deposition of the ingredient a preferably tangentially oriented separation opening is provided. As a preferred measure, the separation device for separating the gas comprises a first separation opening and / or for depositing an ingredient a second separation opening and / or for separating the lubricating fluid a third separation opening. The first separation opening is fluidly connected to the recirculation means and / or the recirculation conduit for separation of the gas, so that while the second separation opening for discharging the ingredient is flow connected to the low pressure side of the pump by means of a separation line.

Since the components to be separated have different densities, a gas-enriched phase of the pumping fluid forms in the interior of the annular chamber of the separation device at the first separation opening. The removal of the lubricating fluid to be used for the lubrication, takes place at the third separation opening, a further outward diameter of the annular chamber of the separation device, where a phase of the pumping fluid with low gas and solid concentration, such as sand, has accumulated. A highly enriched with sand phase of the pumping fluid is formed at the outer edge of the annular chamber of the separation device and is preferred from there via the second separation opening and a corresponding Abscheideleitung is discharged back to the low pressure side of the pump and not used for lubrication, for example, the rotor shaft.

In this case, of course, the recirculation and Abscheideleitung integral components of the pump housing, in particular in the pump housing or pump stator extending bores or hole-like connection openings, or the recirculation and Abscheideleitung can also be realized by separate lines, the separation of the separation device with the recirculation / line and / or the low-pressure side of the pump or other points with low pressure connect.

Thus, for example, the shaft bushing, in which the rotor shaft of the pump is mounted, or the annular gap between the stationary sleeve and rotating shaft sleeve can be optimally supplied with the cleaned of the ingredient phase of the pumping fluid for lubrication, the annular gap by means of a lubricant opening in such a way with the third separation opening fluidly connected to the separation device, that the lubrication fluid, which is at least partially freed from the ingredient, can be fed to the annular gap for lubrication of the shaft passage via the lubricant opening.

In a specific embodiment, an additional lubricant line can be provided such that a predeterminable amount of lubricating fluid can be discharged from the separation device, in particular can be used to supply a further lubrication point of the pump. In this case, of course, the lubricant line in particular an integral part of the pump housing, in particular a running in the pump housing or pump stator bore or hole-like connection opening, or the lubricant line can also be realized by a separate line, the separation device of the separation chamber with the other lubrication point in the pump connects.

Depending on the application and exemplary embodiment, the separation device can either be detachably connected to the rotor shaft, wherein the separation device can be designed, in particular, as a separation disk which can be screwed to the rotor shaft. It is of course also possible that the separation device is an integral part of the rotor shaft, wherein the separation device may be in particular a separation disc integrally connected to the rotor shaft.

The invention further relates to a recirculation device for a pump according to the invention.

Fig. 1

den Stand der Technik am Beispiel einer Pumpe mit Separationsscheibe;

Fig. 2

ein Ausführungsbeispiel einer erfindungsgemässe Pumpe mit Rezirkulationseinrichtung;

Fig. 3

eine detaillierte Darstellung eines Ausführungsbeispiels einer erfindungsgemässe Pumpe mit Rezirkulationseinrichtung;

In the following the invention will be explained in more detail with reference to the drawing. In a schematic representation:

Fig. 1

the prior art using the example of a pump with separation disc;

Fig. 2

an embodiment of an inventive pump with recirculation device;

Fig. 3

a detailed illustration of an embodiment of an inventive pump with recirculation device;

For the following description of the figures, it applies that all reference symbols, which refer to features of the prior art in the examples, are provided with apostrophes and all reference symbols, which refer to features of embodiments according to the invention, are marked without apostrophes.

Fig. 1 shows the state of the art by means of a pump, wherein the construction of the shaft passage with separation means something is shown in more detail in detail. The pump, which is hereinafter referred to in its entirety by the reference numeral 1 ', generally serves to convey a pumping fluid 2' in the form of a multiphase mixture, ie the multiphase mixture consists of various solid, liquid and gaseous constituents. The ingredients are essentially sand and gas which are present as an impurity in the pumping fluid 2 'in intolerable amounts. The pumping fluid 2 'here is petroleum, which under an inlet pressure at a low pressure side LP' of the pump 1 'is ready and in the operating state by means of a in a pump stator (not shown) about a rotation axis A' according to the arrow P rotatably mounted pump rotor (not shown ) is conveyed to a high pressure side HP 'of the pump 1'. The pump rotor is designed in such a way and arranged over a rotor shaft 5 'in a shaft passage 6' that between the rotor shaft 5 'and the shaft passage 6' in an annular gap 21 ', a lubricating film of a formed from the pumping fluid 2' lubricating fluid 200 'can be formed , In addition, it can be seen that on the rotor shaft 5 'a separation device 7' is provided, with which in the operating state to provide the lubricating fluid 200 'a predetermined amount of the ingredient by means of a centrifugal force from the pumping fluid 2' is separable.

As in Fig. 1 shown schematically, is for supplying the constituent comprehensive pumping fluid 2 ', so here the petroleum, the separation device 7', which is configured as a with the rotor shaft 5 'of the pump 1' with screws 70 'screwed separation disc, via a feed line with the High pressure side HP 'of the pump 1' connected. The separation disk is covered by a cover D 'through which the pumping fluid 2' is fed to the separation disk.

The separation disc of Fig. 1 shows in detail, with the rotor shaft 5 'about the rotation axis A' co-rotating separation disc an annular chamber, wherein at the annular chamber for the deposition of the ingredients at least one substantially tangentially oriented separation opening is provided. The separation opening is for discharging separated ingredient, so in the present example for discharging the enriched in oil sand, via a Abscheideleitung 721 'with the low pressure side LP' of the pump 1 'is connected. The sand has a higher density than the lubricating fluid 200 'which is finally used to lubricate the rotor shaft 5'.

In order for the lubricating fluid 200 'to be provided in the shaft passage 6' for lubricating the rotor shaft 5 ', the annular gap 21' is fluidly connected to the separation device 7 'by means of a lubricant opening 22' in such a way that the lubricating fluid 200 ', at least partially freed from the sand, reaches the annular gap 21 'for lubricating the shaft passage 6' via the lubricant opening 22 'can be fed.

Furthermore, a lubricant line 10 'is additionally provided such that a predeterminable amount of lubricating fluid 200' can be discharged from the separation disk, in particular for feeding additional lubrication point of the pump 1 ', which additional lubricant locations are not explicitly shown for reasons of clarity. In this case, the lubricating fluid 200 'branched off via the lubricant line 10' is used for lubricating other parts of the system which lie outside the pump 1 'or are not part of the pump 1'.

As already mentioned, the separation device 7 ', in this case the separation disk, is detachably connected to the rotor shaft 5', but it is also possible that the separation device 7 'is an integral part of the rotor shaft 5', and the separation device 7 'in particular with the rotor shaft 5 'integrally connected separation disc.

The inventive pump is very general and in particular in the specific embodiment of the Fig. 2 and Fig. 3 the promotion of a pumping fluid in the form of a multi-phase mixture. The pump, which is hereinafter referred to in its entirety by the reference numeral 1, is used in general Promotion of a pumping fluid 2 in the form of a multi-phase mixture, ie the pumping fluid consists of various solid, liquid and gaseous ingredients. The ingredients are essentially sand and gas which are present as an impurity in the pumping fluid 2 in intolerable amounts. The pumping fluid 2, for example, oil, which is available under an inlet pressure at a low pressure side LP of the pump 1 and in the operating state by means of a rotatably mounted in a pump stator 3 about a rotation axis A according to the arrow P pump rotor 4 is conveyed to a high pressure side HP of the pump, and a rotor shaft 5 is arranged in such a shaft bushing 6, that between the rotor shaft 5 and the shaft passage 6 in an annular gap 21, a lubricating film of a lubricating fluid 200 formed from the pumping fluid 2 can be formed. In addition, a separation device 7 is provided on the rotor shaft 5, with which in the operating state for providing the lubricating fluid 200 at the annular gap 21 a predeterminable amount of an ingredient by means of a centrifugal force from the pumping fluid 2 is separable. According to the invention, a recirculation device 8 is provided so that a gas 201 can be recirculated with the aid of the separation device 7.

As in Fig. 2 is schematically illustrated, the shaft passage 6 comprises a stationary sleeve 9 and a rotating shaft sleeve 10. The annular gap 21 is, as in the present embodiment, both between the stationary sleeve 9 and the rotating shaft sleeve 10 can be formed, as well as directly between the rotor shaft 5 and shaft passage 6 trainable.

In addition, the in Fig. 2 illustrated recirculation device 8 a feed line 81, a recirculation line 82 and a means for pressure increase 83, in particular a screw conveyor and / or a corrugated pipe. For supplying the pumping fluid 2, the recirculation device 8 is fluidly connected to the high-pressure side HP of the pump by means of the supply line 81, so that the pumping fluid 2 flows from the high-pressure side HP of the pump to the recirculation device 8. The separation device 7 or the separation disk, which rotates about the rotation axis A with the rotor shaft 5, comprises in detail an annular chamber to which annular chamber for deposition of the ingredient a preferably tangentially oriented separation opening is provided. In the presently particularly preferred embodiment, the separation device 7 or separation disc for separating the gas 201 comprises a first separation opening 71 and / or for depositing an ingredient, a second separation opening 72 and / or for depositing the lubricating fluid, a third separation opening 73.

In order for the separated gas 201 to be deposited in the recirculation device 8 and / or recirculation line 82, the first separation opening 71 is flow-connected to the recirculation device 8 and / or recirculation line 82 for separating the gas 201. For recirculation of the gas 201 recirculation device 8 is fluidly connected by means of the recirculation line 82 to the high pressure side HP of the pump and / or a Gassenke. The pressure increase means 83 are required to generate a pressure in the recirculation line 82 which is higher than the high pressure side HP of the pump and / or the gas bank, so that the gas 201 from the recirculation device 8 to the high pressure side HP of the pump and / or the Gassenke is transportable. As already mentioned, the recirculation device 8 is formed as an integral part in the pump stator 3, although it is also possible for the recirculation device 8 to be an external recirculation device 8 that is detachably connected to the pump.

In order for the lubricating fluid 200 to be provided for lubrication, the annular gap 21 is fluidly connected to the third separation opening 73 of the separation device 7 by means of a lubricant opening 22, such that the lubricant fluid 200 at least partially freed from the content reaches the annular gap 21 for lubricating the shaft passage 6 via the lubricant opening 22 can be fed.

Furthermore, a lubricant line is additionally provided such that a predeterminable amount of lubricating fluid 200 can be discharged from the separation disk, in particular for feeding further lubrication point of the pump 1, which additional lubricant points are not explicitly shown for reasons of clarity. In this case, the branched off via the lubricant line lubricating fluid 200 is used for lubrication of other parts of the system, which lie outside the pump 1 and are not part of the pump 1.

The second separation opening 72 is connected to the discharge of separated ingredient, so in the present example for discharging the enriched in oil sand, via a Abscheideleitung 721 with the low pressure side LP of the pump 1. The sand has a higher density than the lubricating fluid 200 which is used for the lubrication of the rotor shaft 5.

The Abscheideleitung 721 is formed as an integral part of the shaft passage 6 or the pump stator 3, but can also be performed as a separate additional Abscheideleitung 721, for example, outside the housing of the pump.

As an advantageous measure, a second throttle point 74 is provided, which serves to increase the resistance in order to avoid a direct outflow of the pumping fluid 2.

It is understood that in all the exemplary embodiments of the invention illustrated only by way of example in the figures, by way of example only and by way of example, the invention particularly, but not exclusively, encompasses all suitable combinations of the exemplary embodiments described.

Claims (15)

Pump for conveying a pumping fluid (2) in the form of a multiphase mixture, wherein in the operating state the pumping fluid (2) provided at an inlet pressure at a low pressure side (LP) of the pump by means of a pump rotor rotatably mounted in a pump stator (3) about a rotation axis (A) (4) is conveyed to a high pressure side (HP) of the pump, and a rotor shaft (5) in such a shaft passage (6) is arranged that between the rotor shaft (5) and the shaft passage (6) in an annular gap (21) Lubricating film from one of the pumping fluid (2) formed lubricating fluid (200) can be formed, and on the rotor shaft (5) is provided a separation device (7), with which in the operating state for providing the lubricating fluid (200) at the annular gap (21) a predetermined Quantity of an ingredient by means of a centrifugal force from the pumping fluid (2) is separable, characterized in that a recirculation device (8) is provided, so that a gas (201) mi t help the separation device (7) is recirculated. Pump according to claim 1, wherein the shaft passage (6) forms a shaft bearing and comprises a stationary bushing (9) and a rotating shaft sleeve (10). Pump according to claim 1 or 2, wherein the shaft passage (6) forms a throttle point. Pump according to one of the preceding claims, wherein the annular gap (21) between the stationary sleeve (9) and the rotating shaft sleeve (10) can be formed. A pump according to any one of the preceding claims, wherein the recirculation means (8) comprises a supply line (81), a recirculation line (82) and a pressure increase means (83), In particular, a screw conveyor and / or a corrugated pipe comprises. Pump according to one of the preceding claims, wherein the recirculation means (8) for supplying the pumping fluid (2) by means of the supply line (81) to the high pressure side (HP) of the pump is fluidly connected, so that the pumping fluid (2) in the operating state of the high pressure side (HP ) of the pump flows to the recirculation device (8). Pump according to one of the preceding claims, wherein the with the rotor shaft (5) about the rotation axis (A) co-rotating separation means (7) comprises an annular chamber, on which annular chamber for depositing the ingredient is provided a preferably tangentially oriented separation opening. Pump according to one of the preceding claims, wherein the separation device (7) for separating the gas (201) has a first separation opening (71) and / or for depositing an ingredient a second separation opening (72) and / or for separating the lubricating fluid a third separation opening ( 73). A pump according to any one of the preceding claims, wherein the first separation port (71) is flow-connected to separate the gas (201) from the recirculation means (8), in particular the recirculation line (82). Pump according to one of the preceding claims, wherein for the recirculation of the gas (201), the recirculation means (8) by means of the recirculation line (82) to the high pressure side (HP) of the pump and / or a Gassenke flow connected. Pump according to one of the preceding claims, wherein the recirculation line (82) is designed such that by means of the means for increasing the pressure (83) a pressure in the recirculation line (82) higher than on the high pressure side (HP) of the pump and / or Gassenke produced is and the gas (201) from the recirculation device (8) on the high pressure side (HP) of the pump and / or the Gassenke is conveyed. Pump according to one of the preceding claims, wherein the recirculation device (8) is formed as an integral part in the pump stator (3). Pump according to one of the preceding claims, wherein the second separation opening (72) for discharging the ingredient by means of a Abscheideleitung (721) with the low pressure side of the pump (LP) is fluidly connected and / or the annular gap (21) by means of a lubricant opening (22) with so the third separation opening (73) of the separation device (7) is fluidly connected, that the at least partially freed of the ingredient lubricating fluid (200) the annular gap (21) for lubricating the shaft passage (6) via the lubricant opening (22) can be fed. Pump according to one of the preceding claims, wherein a lubricant line is provided such that a predetermined amount of lubricating fluid (200) from the separation device (7) can be discharged, in particular for feeding a further lubrication point of the pump (1) can be discharged. Recirculation device (8) for a pump (1) according to one of claims 1 to 14.

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