EP3298241B1 - Oil-lubricated slide vane rotary vacuum pump with oil separating and reconditioning device - Google Patents

Description

Field of technology

The invention relates to an oil-lubricated rotary vane vacuum pump with a rotary vane unit, comprising a rotary vane chamber and a rotary vane rotor, and with an oil separating and reprocessing device, whereby in the oil separating and reprocessing device there is a separation of oil and gas by means of the mentioned Devices one or more monitoring and / or maintenance devices are provided and the oil separation and reprocessing device is accommodated in an oil separation and reprocessing housing, with side walls, a bottom wall, a top wall and end walls, the side walls extending transversely to a plane of rotation of the rotary valve rotor and specify a longitudinal extension of the oil separator and reprocessing housing.

State of the art

Oil-lubricated rotary vane vacuum pumps of the type in question are known. This is usually a rotary valve fan with a rotary valve housing which forms a rotary valve chamber and which rotary valve chamber is designed in the form of a cylindrical bore. The rotary vane rotor is usually cylindrical, with slides which are arranged to be displaceable in slots of the rotor. The slots in the rotor can be aligned strictly radially with respect to a cross section through the rotor or they can also run at an acute angle to a radial. According to the prior art, the rotor is preferably supported in the area of the side covers closing off the rotary valve housing at each end.

When the vacuum pump is operating, the rotor rotates radially offset to the central axis of the rotary valve housing. This results in closed chambers, separated by the essentially radially displaceable slides, the size of which changes during one rotation of the rotor. The change in size results in pressure differences between the individual chambers and thus between the inlet side and the outlet side of the pump.

In oil-lubricated rotary vane vacuum pumps, oil is fed into the rotary vane housing. This adds gaps between the various components. In this way, the gas exchange between the chambers that are established between the slides is also hindered. In this way, higher vacuums are achieved during operation than with so-called dry-running rotary vane vacuum pumps.

Due to the design, the oil is pumped from the last chamber into the outlet together with the pumped gas. In addition, due to the compression enthalpy in the system, the oil is heated. The oil can also become contaminated as a result of contact with the pumped medium or change as a result of possible chemical reactions. This results in a preferred preparation of the oil after it has left the fan area. In this regard, it is known to let the oil run through the device in a cycle.

It is also known that the oil treatment process can essentially be carried out in three sub-processes. First of all, oil and gas are separated, possibly in several stages. A coarse separation of large oil droplets can be provided by a corresponding filter element, as well as alternatively or in combination with this, gravity and / or impact separation by deflecting the gas-oil mixture and alternatively or in combination by slowing down the flow. To separate oil and gas, a Separation device, for example fine separation, can be provided, the gas flow being passed through a special filter mat, for example. In a further sub-process, the breakdown of oil foam can be provided. Too much foam or air bubbles trapped in the oil can hinder the flow of oil through the device and thus the function of the lubricant and sealant. Another sub-process can be filtering the oil in an oil filter.

One or more monitoring and / or maintenance devices can be provided, for example an electrical oil level sensor and / or an oil sight glass and / or an oil temperature monitor.

In addition, it is known to accommodate the oil separation and reprocessing device in an oil separation and reprocessing housing which is separate from the rotary valve housing, but possibly coupled. The side walls of such a housing extend transversely to the direction of rotation of the rotary valve rotor and thus preferably essentially in the direction of axial extension of the rotary valve rotor.

From the DE 20 37 727 A1 a rotary vane pump is known in which a device for separating oil and gas is provided. Monitoring and / or maintenance devices for said device for separating oil and gas are provided at various points on the unit.

From the DE 10 2007 017 915 A1 It is known to design the intake and exhaust ducts in a side channel compressor in a common aluminum extrusion profile. From the GB 23 94 007 A a rotary vane vacuum pump is known.

Summary of the invention

Based on the prior art presented, the invention is concerned with the task of specifying an advantageous oil-lubricated rotary vane vacuum pump.

This object is achieved in the subject matter of claim 1, whereby the aim is that the oil separation and recycling housing consists of an extruded profile, in particular an extruded aluminum profile, with regard to its longitudinal extent and has an integrally formed chamber, with one in the erected state with regard to gravity lower and an upper chamber.

As a result, the housing of the oil separation and reprocessing system in particular can be manufactured inexpensively. The contour is preferably identical at each point on the longitudinal axis of the housing part.

In relation to an extruded profile, a wrought aluminum alloy is pressed through a two-dimensional die so that an elongated profile is created which can be cut to the preferred length. This offers the production of such a housing with dimensionally stable contours over the entire length.

The outer surfaces can be designed to be optically clean and uniform. Further work steps, in particular surface processing steps, can be dispensed with, in particular when producing from an extruded profile. In addition, according to the proposed design of the housing, the surface of the same can be represented as a design element.

The profile of the same cross-section, preferably the extruded profile, offers the possibility of changing the volume of the oil separation and recycling device and adapting it to the requirements of the application.

The cover parts are assigned to the end walls of the oil separation and reprocessing housing. For example, an end wall can be designed as a rear side cover and a service cover can be assigned to a front end wall customary in operation. In addition, a removable maintenance cover can be arranged in particular on the service cover for maintenance purposes.

The monitoring and / or maintenance devices, more preferably all the monitoring and / or maintenance devices that are relevant in the normal operation of the vacuum pump, are preferably provided in or on the three cover parts. Frequently used monitoring and / or maintenance devices are furthermore preferably provided in the service cover or in the maintenance cover that can be arranged on the service cover or can be accessed via these.

As a result of the proposed configuration, essential functions lie in the area of the three cover parts or are to be carried out in the area of these. These are in particular filling in oil and / or checking oil and / or monitoring oil and / or draining oil and / or attaching oil separator cartridge and / or creating access for maintenance of the oil separating cartridge and / or attaching a float device and / or creating access to the float device and / or form space for separated oil and / or create return for collected oil and / or receptacle for the maintenance cover and / or divide it into the upper and lower space of the oil separation and reprocessing housing and / or connection of an oil bath heating and / or connection of a water cooling and / or connection for Direct the filter and / or connection for elements connected downstream of the vacuum pump and / or blown air in a defined direction.

The actual oil separation and reprocessing housing without the aforementioned cover parts is preferably without a relevant function, at least with regard to the user interface. This housing can thus be made simple. In particular, the top wall and the bottom wall, more preferably also at least one external side wall, can be designed without any preparations for the arrangement of relevant devices.

In general terms, the float device is a control for the flow from the upper to the lower chamber. It is influenced in particular by an oil level that is established in the upper chamber. Exceeding a certain predetermined oil level should be avoided. It can also be referred to as a so-called valve. For the sake of simplicity, this device is always referred to below as a float device.

The one or more monitoring and / or maintenance devices can be arranged on a removable maintenance cover of the oil separation and reprocessing device, the separating device, e.g. the fine separator and / or a float device being accessible for maintenance when the maintenance cover is removed.

The one or more monitoring and / or maintenance devices are preferably assigned to a housing area of the oil separation and reprocessing device, in which area a removable maintenance cover is formed. The monitoring and / or maintenance devices can be arranged or formed directly on the maintenance cover, but optionally also in the immediate vicinity of the maintenance cover in the surrounding housing area. This reduces the space required for the rotary vane vacuum pump in the installation and use area. By removing the maintenance cover from the oil separator and reprocessing housing, access to components of the oil separator and reprocessing device can be made possible, in particular access to the separating device, e.g. the fine separator - also known as the air / oil separator - and / or to a float device. Such a float device may be necessary in order to allow the gas stream to flow in a targeted manner through the one or more filter elements when the vacuum pump is in operation, due to given pressure differences in the area of the oil separation and reprocessing device. Here, separated oil is collected in a cavity, preferably formed in a service cover that forms an end wall of the oil separation and recycling housing. In the cavity, which can also be referred to as an oil collecting space, a hollow body is arranged, connected to a joint, preferably a swivel joint, and a seal. The seal blocks the oil return. If the oil level rises, the hollow body floats and the seal, which opens an opening for the oil return, is lifted over the joint.

The maintenance cover is preferably designed and arranged in such a way that the oil located behind it in the oil separation and recycling housing cannot escape when the maintenance cover is removed.

The maintenance cover is preferably arranged in the area of an end wall of the oil separation and reprocessing housing. Also can Maintenance cover can be arranged on a service cover assigned to an end wall of the oil separation and recycling housing.

It can further be provided that the maintenance cover forms part of an end wall of the oil separation and reprocessing housing or the end wall as a whole. When the vacuum pump is in use, the end wall can be oriented towards an operator or control person.

In a preferred embodiment, the maintenance cover sealingly covers an opening provided in the end wall of the housing through which, for example, the separating device, for example the fine separator and / or the float device, are accessible for maintenance. Thus, with regard to its top surface, the maintenance cover can have a size which corresponds to 0.25 to 0.5 times the outwardly facing end surface of the end wall.

A separating device is provided for separating oil and gas, which is preferably formed by a filter element and / or by a gravity and / or impact separator and / or a fine separator. Insofar as reference is made above or below to a separating device, it can be one of the configurations mentioned above, without this being specified in every case.

The separating device through which the flow can flow, for example the fine separating device, can be arranged in the longitudinal direction of the oil separating and reprocessing device with respect to the flow direction. The arrangement of the separating device, for example the fine separation device, is also preferably selected with respect to the direction of flow in the direction of longitudinal extent of the extruded housing profile.

The maintenance cover is preferably arranged as an extension of the separating device, for example the fine separation device, in the area of the end wall. A longitudinal center axis of the separating device, for example the fine separating device, can extend through the maintenance cover in the area of its broad side surfaces.

After removing the maintenance cover, a filter element, if provided, preferably in the form of a special filter mat, can only be removed from the separating device, for example the fine separation device. In this way, it can easily be exchanged for a new filter element, for example.

A side wall is provided between the rotary valve assembly and the oil separation and reprocessing device. This can be the side wall of the oil separator and reprocessing housing. The side wall can have a passage opening through which compressed gas with an oil content from the rotary valve assembly can enter the oil separation and reprocessing device.

The entering gas with oil content can flow in a first section of the oil separation and reprocessing device in countercurrent to a second section, in which second section the separation of oil and gas, for example the fine separation, takes place. The direction of flow can, as is also preferred, be given in the longitudinal extension of the oil separator and reprocessing housing, and thus more preferably in the longitudinal extension of the extruded profile. This is an essential flow direction from one end region of the housing along its longitudinal extent to the other end region of the housing, wherein deviations from a strictly linear flow direction can be provided within this flow from one end of the housing to the other.

Below the passage opening can be formed as a flow path adjoining housing section into which oil separated from the gas flows as a result of gravity and / or centrifugal force. The housing section can serve to accommodate an oil sump, and can thus further be designed in the manner of an oil pan. A preferably first separation of gas and oil takes place via a separation by gravity and / or centrifugal force.

In order to allow an oil change, possibly also a connection to an oil cooling circuit, the housing section has at least one oil outlet opening. This can, as is also preferred, be designed in a vertically lowest region of the housing section when the vacuum pump is in the set-up and use state, more preferably near the bottom of the same. More preferably, the oil outlet opening can be closed.

The oil outlet opening can also be accessible from an end wall of the oil separation and recycling housing. In a preferred embodiment, the oil outlet opening is assigned to the end wall on which the maintenance cover is also arranged at the same time.

In particular for the separation of particles from the oil separated from the gas, an oil filter can also be provided in the housing section or assigned to it, through which the oil located in the housing section can be conducted. As preferred, it can be a replaceable oil filter.

The oil passed through the oil filter can preferably be introduced into the rotary valve chamber. For this purpose, a pump can be provided which sucks the oil collecting in the housing section through the oil filter and conveys it into the rotary slide chamber of the rotary slide assembly. A design without a pump is preferred, in which the pressure difference between the oil collecting space and the working space of the vacuum pump is used for the oil delivery.

A filter mat can be provided in the separating device, for example the fine separation device. This filter mat is preferably exchangeable, such a change, in a preferred embodiment, taking place from the one end wall having the maintenance cover after the maintenance cover has been removed.

The filter mat can be tubular with an inner flow path for the gas / oil mixture. Oil separated in the separating device, for example fine separating device, flows in a preferred embodiment via the float device into the housing section having the oil collecting space.

The flow resistance of the filter mat results in a pressure difference upstream and downstream of the separating device. Depending on the volume flow that the pump is currently delivering, this can be up to 400 mbar. As a result of this pressure difference, the float device is necessary, since otherwise the gas stream, immediately passing through the fine separation device, would flow directly to the gas outlet.

The float device can be formed directly on the maintenance cover or, as preferred, be accessible after removing the maintenance cover. This, too, offers an improvement in maintenance.

A fill level indicator can also be provided on the front wall, possibly in or on the maintenance cover. The oil level of the vacuum pump can be read off here. This can be a conventional sight glass, or alternatively an analog or digital measured value display.

An overpressure valve or a bursting disc can also be arranged in the end wall, if necessary in the maintenance cover. Such a pressure relief valve or a rupture disc serves as protection against a sudden overpressure in the device. With a possible arrangement of a burst protection in the maintenance cover, the safe operating state can be restored in a technically simple manner after an event, for example by changing the maintenance cover as a whole.

In a further embodiment, a temperature monitoring element can be arranged in the end wall, if necessary in the maintenance cover or assigned to the maintenance cover. This is used in particular to monitor the oil temperature.

In a preferred embodiment, the gas separated from the oil can exit through the end wall, more preferably through the maintenance cover. For this purpose, the end wall, in particular the maintenance cover, has a corresponding outlet opening.

In a preferred embodiment, the maintenance cover has a gas outlet nozzle. This can be designed to connect a silencer or a continuation element. In a first embodiment of the maintenance cover, the gas outlet nozzle can also be equipped with a thread. Outlet piping can be connected to this. The thread can also be used to connect a burst valve. If necessary, the burst valve can also be arranged and fastened in the outlet piping. If necessary, a pipeline, a silencer or other gas routing elements can be connected. By changing the maintenance cover, a correspondingly equipped maintenance cover can also be arranged when the device is in use.

In a second embodiment, the gas outlet connector can be provided with an optionally removable deflection cap in which the exiting gas is deflected by at least 60 ° with regard to its exit direction given at the gas outlet connector. The deflection is preferably like this chosen that the exiting gas flows out downwards. This reduces the noise level when the vacuum pump is operating, as the sound is directed in one direction towards the floor. The gas outlet nozzle can also be rotatably arranged on the maintenance cover, so that, for example, it can also be deflected to the side or upwards.

The oil separation and recycling housing can have an integrally formed chamber with a lower chamber and an upper chamber in the erected state with regard to the force of gravity, wherein an end wall can be connected to the front and rear in the longitudinal direction of the oil separating and recycling housing. The integral formation of chambers can be formed in the course of the preferred production of the housing from an extruded profile. In a preferred embodiment, the upper chamber serves in particular to accommodate the separating device, for example the fine separation device, while the lower chamber forms the above-described housing section when the vacuum pump is in operation. The end walls to be connected each form an end closure of the oil separation and recycling housing. One of the end walls can have an opening covered with the maintenance cover described above.

At least one end wall here preferably forms a connection between the chambers. In the case of a preferred counter-directed flow within the chambers, at least one end wall can form gas deflection areas.

In a preferred embodiment, the passage opening from the rotary slide assembly or from the rotary slide chamber to the oil separation and reprocessing device opens into the lower chamber of the oil separation and reprocessing housing. The gravity and / or impact separator preferably adjoins this passage opening, viewed in the direction of flow.

In a preferred embodiment, the lower chamber also forms an oil collecting container.

Associated with the oil collecting container, one or more cooling lines, preferably integrated in the extruded profile, can be provided. In the area of the oil collecting container, inlets and outlets for cooling the oil by means of an external cooler can also be provided.

Brief description of the drawings

Fig. 1

eine ölgeschmierte Drehschieber-Vakuumpumpe in perspektivischer Darstellung;

Fig. 2

die Draufsicht hierzu;

Fig. 3

die Vakuumpumpe in einer Seitenansicht mit Blick auf eine Stirnwand mit einem Wartungsdeckel;

Fig. 4

den Schnitt gemäß der Linie IV-IV in Figur 3;

Fig. 5

den Schnitt gemäß der Linie V-V in Figur 2;

Fig. 6

die Herausvergrößerung des Bereiches VI in Figur 4;

Fig. 7

die Vakuumpumpe in perspektivischer Darstellung nach Entfernen einer Stirnwand und eines Ölabscheide- und Wiederaufbereitungsgehäuses;

Fig. 8

das Ölabscheide- und Wiederaufbereitungsgehäuse in perspektivischer Einzeldarstellung;

Fig. 9

in perspektivischer Einzeldarstellung die in Figur 7 entfernte Stirnwand mit zugeordnetem Wartungsdeckel und einem an dem Wartungsdeckel festlegbaren Gasaustrittsstutzen;

Fig. 10

eine weitere perspektivische Darstellung des Wartungsdeckels mit Blick auf die im Nutzungszustand innere Fläche;

Fig. 11

das Ölabscheide- und Wiederaufbereitungsgehäuse in einer Schnittdarstellung.

The invention is explained in more detail below with reference to the accompanying drawing, which only represents an exemplary embodiment. It shows:

Fig. 1

an oil-lubricated rotary vane vacuum pump in a perspective view;

Fig. 2

the top view of this;

Fig. 3

the vacuum pump in a side view with a view of an end wall with a maintenance cover;

Fig. 4

the section along the line IV-IV in Figure 3 ;

Fig. 5

the section along the line VV in Figure 2 ;

Fig. 6

the enlargement of area VI in Figure 4 ;

Fig. 7

the vacuum pump in perspective after removal of an end wall and an oil separation and recycling housing;

Fig. 8

the oil separation and reprocessing housing in a perspective individual view;

Fig. 9

in perspective individual representation the in Figure 7 remote end wall with associated maintenance cover and a gas outlet nozzle that can be fixed to the maintenance cover;

Fig. 10

a further perspective view of the maintenance cover with a view of the inner surface when in use;

Fig. 11

the oil separation and recycling housing in a sectional view.

Description of the embodiments

Is shown and described, initially with reference to Figure 1 , an oil-lubricated rotary vane vacuum pump 1 with a rotary vane unit and an oil separation and recycling device 3.

The rotary slide assembly 2 has an assembly housing in which a rotary slide chamber 5 with a rotary slide rotor 6 is arranged and is covered by a hood 4.

The rotary slide chamber 5 is designed in the manner of a cylindrical bore in the unit housing. The rotary slide chamber 5 has a longitudinal extent which is oriented on the bore axis of the rotary slide chamber 5.

The cylindrical rotary valve rotor 6 is arranged eccentrically with respect to the rotary valve chamber 5. Correspondingly, the rotor axis x runs parallel but offset to the spatial axis.

The rotary vane rotor 6 has several, in the exemplary embodiment three slides 7. These are arranged such that they can slide in slots 8 of the rotor 6, which are approximately radially aligned in cross section. The slide 7 are pressed by the rotation of the rotary slide rotor 6 due to centrifugal force against the wall delimiting the rotary slide chamber 5.

During operation of the vacuum pump 1, the rotary vane rotor 6 rotates radially offset to the center axis of the rotary vane chamber 5, which means that it is driven by a motor, in particular an electric motor 9, which rotates on the rotor shaft. This results in closed chambers 10, separated by the radially displaceable slides 7 , the size of which changes during one revolution of the rotary valve rotor 6.

The rotary valve chamber 5 is closed at the end with respect to its longitudinal axis by an air guide hood 11 and a motor flange 12, which can provide a bearing for the rotary valve rotor 6.

Outside the unit housing, for example associated with the motor flange 12, the electric motor 9 is preferably fastened to the unit housing. The shaft of the rotary valve rotor 6 can pass through the relevant motor flange 12 for the non-rotatable engagement of the electric motor 9.

The change in size of the chambers 10 during operation of the vacuum pump 1 results in pressure differences between the individual chambers 10 and thus between the inlet side and the outlet side of the fan thus formed.

The drive via the electric motor 9 can be arranged directly on the rotor shaft or, as further preferred, via a coupling.

Oil-lubricated rotary vane assemblies 2 are distinguished by the fact that in these oil is introduced into the rotary vane chamber 5. Through this oil gaps are added between the various components, in particular between the slides 7 and the wall of the rotary slide chamber 5. The gas exchange between the various chambers 10 is thus hindered. In this way, higher vacuums are achieved during operation than is possible with dry-running rotary vane pumps.

Due to the design, the oil is pumped out of the last chamber 10 of the rotary valve assembly 2 together with the pumped gas. In addition, the oil is heated due to the enthalpy of compression in the system. Since the oil comes into contact with the pumped medium (gas), it can become dirty or change as a result of possible chemical reactions.

The oil runs through the vacuum pump 1 in a cycle. This means that it has to be processed after it has left the rotary valve assembly 2. The oil separation and reprocessing device 3 is used for this purpose.

The device 3 is connected to the rotary valve unit 2, so that a unit is formed, consisting of the rotary valve unit 2, the oil separation and recycling device 3 and the electric motor 9.

The oil separation and reprocessing device 3 initially has an oil separation and reprocessing housing 13, with side walls 14, 15, a bottom wall 16, a top wall 17 and end walls 18, 19.

The end walls 18 and 19 are viewed in the longitudinal extension of the housing 13, which longitudinal extension corresponds to the longitudinal extension of the rotary valve chamber 5 of the rotary valve unit 2, each arranged at the end of the housing integrally forming the side walls 14 and 15, the bottom wall 16 and the top wall 17, in particular with screwed to the housing. The end wall 18 is preferably formed by a service cover and the end wall 19 by a rear side cover.

With regard to its longitudinal extent, the housing 13 can consist of an extruded profile 20, in particular an aluminum extruded profile. Thus, the oil separation and reprocessing housing 13 has an essentially constant cross section over its length, viewed over the longitudinal extent while maintaining a dimensionally stable contour. In addition, when the housing 13 is manufactured using the extrusion process, the outer surfaces are designed to be optically uniform and clean, so that surface processing steps for the optical enhancement of the surface can be dispensed with. Only necessary processing steps, such as openings in the side walls and / or bottom wall and / or top wall, for example, can be provided.

The production of the housing 13 in the extrusion process can also be used to the effect that, in addition to the surface, the shape of the housing can also be designed in such a way that it ultimately represents the design element.

The side walls 14 and 15 extend transversely to a plane of rotation of the rotary valve rotor 6, in the illustrated embodiment the side wall 14 also represents the fastening plane for fastening the oil separation and recycling housing 13 to the unit housing.

In one possible embodiment, the end walls 18 and 19 arranged at each end close on the outside of the wall with the adjacent air guide hood 11 and the motor flange 12, as well as, more preferably, the top wall 17 and the bottom wall 16 with the adjoining adjacent wall sections of the unit housing. The result is a compact and visually appealing unit.

The outer surface of the side wall 15 facing away from the rotary valve unit 2 and thus facing outward is designed to be corrugated with reference to a cross section in the plane of rotation of the rotary valve rotor 6 (cf. in particular Figure 11 ). Over the extension length of the side wall 15 viewed in cross section, uniform, rounded elevations are obtained which are connected to one another via valleys. This increases the surface area in the area of the side wall 15 and thus improves the heat dissipation during operation of the vacuum pump 1.

In a preferred embodiment, the wave surface continues in the facing surface areas of the end walls 18 and 19.

The oil separation and recycling housing 13 has a preferably integrally formed chamber. With reference to an installation state as also shown, a lower chamber 21 and an upper chamber 22 result with regard to gravity. The separation of the chambers 21 and 22 is achieved by a with reference to a cross section according to FIG Figure 11 separating web 23 running transversely to the side walls 14 and 15.

In the oil separation and reprocessing device, when the vacuum pump 1 is in operation, there is in particular a separation of oil and gas.

To this end, a gravity and / or impact separator 24 and a separating device 25, for example the fine separating device, are initially provided.

The oil / gas mixture enters the oil separation and reprocessing device 3 from the rotary valve assembly 2 via a passage opening 26 in the area of the side wall 14.

Upon entry into the device 3, a coarse separation of large oil droplets preferably takes place first of all by the gravity and / or impact separator 24 as a result of the diversion of the gas-oil mixture and slowing down of the flow.

The entry of the oil-gas mixture into the device 3 takes place as a result of the corresponding arrangement of the passage opening 26 in the area of the lower chamber 21 in which the gravity and / or impact separator 24 is arranged accordingly.

The housing section 27 resulting under the passage opening 26 in the area of the lower chamber 21 serves in the manner of an oil pan in which an oil sump collects. An oil collecting container is thus formed in the lower chamber 21.

The lower chamber 21 also forms a flow path with a flow a oriented towards the longitudinal alignment of the housing. This flow a is directed in the direction of the rear end wall 19.

The inner side of the end wall 19 is designed to deflect the flow from the lower chamber 21 into the upper chamber 22, in which the flow path formed in the upper chamber 22 allows a flow b opposite to the flow a of the lower chamber 21.

The separating device 25, for example the fine separation device, is arranged in the upper chamber 22.

The separating device 25, for example the fine separation device, has a tubular filter mat 42, the tube axis of which is preferably aligned with the rotor axis x of the rotary valve rotor 6 oriented arranged.

The oil-gas mixture diverted from the lower chamber 21 into the upper chamber 22 is directed through the separating device 25, e.g. the fine separation device, whereby a pressure difference results in front of and behind the separating device 25, e.g. the fine separating device can be up to 400 mbar depending on the delivery pressure of the rotary valve assembly 2.

Furthermore, an oil foam breakdown device can be provided in the oil separation and reprocessing device 3.

An oil filter 28 is also provided. This can be arranged assigned to the bottom area of the oil separation and reprocessing housing 13, more preferably to the rear end wall 19. The oil located in the oil sump is sucked through the oil filter 28 and, in particular, freed from solid particles.

Using the pressure difference between the lower chamber 21 and the chamber 10 in the rotary valve unit 2, the oil filtered in the oil filter 28 is conveyed into the rotary valve unit 2 via a suction line 29.

The oil, in particular the filtered oil, can be cooled by means of an external cooler (not shown). For this purpose, corresponding inlets and outlets are provided in the area of the lower chamber 21.

Cooling paths can also be provided in the profile of the housing 13, for example in the area of the bottom wall 16 and / or the side walls 15 (assigned to the lower chamber 21).

The end wall 18, preferably facing an operator in the state of use, leaves a passage on the inside of the wall for connecting the upper chamber 22 to the lower chamber 21, which passage is formed from a float device 30. Oil separated at the separator 25, e.g. the fine separation device, is fed back into the reservoir in the area of the lower chamber 21, this through the float device 30 The fine separation device, a short-circuit-like flow of the gas entering the lower chamber 21 through the passage opening 26 directly to the gas outlet 31.

In addition, an oil bath heater can be provided in order to heat the oil before the vacuum pump 1 is started.

In addition, additional water cooling can be provided.

The oil bath heating and / or the water cooling can be arranged on the end wall 19.

In the end wall 18 facing away from the electric motor 9 and forming a front side during operation, a window-like opening 32 extending at least approximately over the entire cross-sectional area of the upper chamber 22 is assigned to the upper chamber 22. This is closed by a maintenance cover 33 when the vacuum pump 1 is in operation. The maintenance cover 33 can be screwed to the end wall 18, preferably with the interposition of a seal.

The gas outlet 31 is provided in the maintenance cover 33. For this purpose, the maintenance cover 33 has a passage opening 34 to which a gas outlet connection 35 adjoins on the outside of the wall of the maintenance cover 33.

The gas outlet nozzle 35 is designed in the form of a removable deflection cap 36, in which the escaping gas in terms of its at the Gas outlet nozzle given orientation - which is essentially in the same direction as the flow b in the upper chamber 22 - is deflected at least 60 °, preferably up to 90 ° downwards in the direction of the plane given by the bottom wall 16. This directs the sound towards the floor, which leads to a reduction in noise pollution.

The gas outlet connection 35 is preferably arranged rotatably on the maintenance cover 33, so that the exhaust air can optionally also be deflected to the side or upwards, for example.

The deflection cap 36 can be exchanged, for example with a gas outlet nozzle for connecting a silencer or a continuation element.

In addition, a maintenance cover 33 with deflection cap 36 can be exchanged for a maintenance cover 33 for connecting, for example, external piping.

The oil separation and reprocessing device 3 has several monitoring and / or maintenance devices 37. Thus, a level indicator 38 for determining the amount of oil can be provided in the end wall 18, associated with the lower chamber 21. The level indicator 38 can be formed by an oil sight glass and / or by an electrical oil level sensor.

A possible oil temperature display can also be arranged in the area of the end wall 18.

Furthermore, both the inlet and the outlet for changing the oil in the oil separation and reprocessing device 3 can be provided in the end wall 18. For this purpose, in one embodiment, an oil outlet opening 39 and a filler neck 40 are provided in the end wall 18.

After removing the maintenance cover 33 assigned to the end wall 18, the separating device 25, for example the fine separating device, and the float device 30 are accessible from the operating side of the vacuum pump 1 for maintenance and, if necessary, replacement.

In addition, a pressure relief valve can be arranged in the maintenance cover 33.

The pressure relief valve serves as a safeguard against sudden excess pressure in the oil separation and reprocessing device 3; is thus preferably part of the monitoring device.

The end walls 18 and 19 as well as the maintenance cover 33 are assigned as cover parts A, B and C to the oil separation and recycling housing 31 directly or indirectly (cover part C or maintenance cover 33).

As a result of the above-described arrangement of the monitoring and / or maintenance devices 37 and the design of the cover parts A, B and C, all interfaces relevant to the operator are preferably accommodated in the region of the end walls 18, 19, which is conveniently accessible, which reduces the space required for the device, the ease of maintenance is increased and the manufacturability of the oil separator and reprocessing housing is simplified.

List of reference symbols

1 Vacuum pump 25th Separator 2 Rotary slide unit 26th Passage opening 3 Oil separation and recycling device 27 Housing section 28 Oil filter 4th Hood 29 Suction line 5 Rotary valve room 30th Float device 6th Rotary vane rotor 31 Gas outlet 7th Slider 32 opening 8th slot 33 Maintenance cover 9 Electric motor 34 Passage opening 10 chamber 35 Gas outlet nozzle 11 Air guide hood 36 Deflection cap 12th Motor flange 37 Monitoring and maintenance facility 13th Oil separator and reprocessing housing 38 Level indicator 14th Side wall 39 Drain opening 15th Side wall 40 Filler neck 16 Bottom wall 42 Filter mat 17th Ceiling wall 18th Front wall a flow 19th Front wall b flow 20th Extruded profile x Rotor axis 21 lower chamber 22nd upper chamber A. Cover part 23 Divider B. Cover part 24 Gravity and / or impact separator C. Cover part

Claims (15)

1. Oil-lubricated rotary vane vacuum pump (1) comprising a rotary vane unit (2) having a rotary vane chamber (5) and a rotary vane rotor (6), and comprising an oil separating and reconditioning device (3), oil and gas being separated in the oil separating and reconditioning device (3) by means of devices, one or more monitoring and/or maintenance devices (37) being provided for said devices, and the oil separating and reconditioning device (3) being accommodated in an oil separating and reconditioning housing (13) having lateral walls (14, 15), a bottom wall (16), a top wall (17) and end walls (18, 19), the lateral walls (14, 15) extending transversely to a plane of rotation of the rotary vane rotor (6) and predefining a longitudinal extension of the oil separating and reconditioning housing (13), characterised in that the oil separating and reconditioning housing (13), with respect to the longitudinal extension thereof, consists of an extruded profile, in particular an aluminium extruded profile, and has an integrally formed chamber system having a lower chamber (21) and an upper chamber (22) in the installed state with respect to gravity.
2. Rotary vane vacuum pump according to claim 1, characterised in that the one or more monitoring and/or maintenance devices (37) are only arranged in one or more cover parts (A, B, C), which are attached to one or both end walls (18, 19) of the oil separating and reconditioning housing (13), and in that the oil separating and reconditioning housing (13) is otherwise formed having the lateral walls (14, 15), the bottom wall (16) and the top wall (17), without a configuration for a monitoring and/or maintenance device (37).
3. Rotary vane vacuum pump according to any of the preceding claims, characterised in that the one or more monitoring and/or maintenance devices (37) are arranged on a removable maintenance cover (33) of the oil separating and reconditioning device (3), a separating device (25), which has a float device (30), being accessible for maintenance when the maintenance cover (33) is removed.
4. Rotary vane vacuum pump according to claim 3, characterised in that the maintenance cover (33) forms part of an end wall (18, 19) of the oil separating and reconditioning housing (13) or the end wall (18, 19) as a whole.
5. Rotary vane vacuum pump according to any of the preceding claims, characterised in that a separating device (25) is provided and in that the separating device (25) which can be flowed through, for example a fine separating device, is arranged in a longitudinal direction of the oil separating and reconditioning device (3) with respect to a flow direction (b).
6. Rotary vane vacuum pump according to any of the preceding claims, characterised in that a lateral wall (14, 15) between the rotary vane unit (2) and the oil separating and reconditioning device (3) has a passage opening (26) through which compressed gas having an oil content can enter the oil separating and reconditioning device (3).
7. Rotary vane vacuum pump according to any of the preceding claims, characterised in that gas enters the rotary vane vacuum pump and in that the entering gas having an oil content flows in a first portion of the oil separating and reconditioning device (3) in a counterflow (a) to a second portion, in which the fine separation takes place.
8. Rotary vane vacuum pump according to either claim 6 or claim 7, characterised in that a housing portion (27) is formed below the passage opening (26) and as an adjoining flow path, into which housing portion oil separated from the gas enters as a result of gravity and/or centrifugal force.
9. Rotary vane vacuum pump according to claim 8, characterised in that the housing portion (27) has an oil outlet opening (39), the oil outlet opening (39) preferably being accessible from an end wall (18, 19) of the oil separating and reconditioning housing (13), and/or in that the oil located in the housing portion (27) can be conducted through an oil filter (28).
10. Rotary vane vacuum pump according to claim 9, characterised in that oil conducted through the oil filter (28) can be introduced into the rotary vane chamber (5).
11. Rotary vane vacuum pump according to any of claims 5 to 10, characterised in that a filter mat (42) is provided in the separating device (25).
12. Rotary vane vacuum pump according to claim 11, characterised in that the filter mat (42) is tubular and has an inner flow path for the gas/oil mixture.
13. Rotary vane vacuum pump according to any of the preceding claims, characterised in that a fill level indicator (38) and/or a pressure relief valve or a bursting disc (41) and/or a temperature monitoring element is provided on an end wall (18, 19), optionally in a maintenance cover (33).
14. Rotary vane vacuum pump according to any of the preceding claims, characterised in that conveyed gas can exit through an end wall (18, 19), preferably through a maintenance cover (33), the maintenance cover (33) preferably having a gas outlet nozzle (35), the gas outlet nozzle (35) more preferably being provided with an optionally removable deflection cap (36), in which the exiting gas is deflected by at least 60° with respect to the outlet direction thereof at the gas outlet nozzle (35).
15. Rotary vane vacuum pump according to any of the preceding claims, characterised in that an end wall (18) can optionally be associated with a maintenance cover (33) having a gas outlet nozzle (35) or with a maintenance cover (33) for connecting a sound damper or a continuation element.

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