EP3482078A1

EP3482078A1 - Oil-lubricated rotary vane vacuum pump

Info

Publication number: EP3482078A1
Application number: EP17735525.2A
Authority: EP
Inventors: Artjom KRAFT; Islam AKYILDIZ; Markus LÖBEL; Frank RISCHEWSKI
Original assignee: Gebr Becker GmbH
Current assignee: Gebr Becker GmbH
Priority date: 2016-07-08
Filing date: 2017-07-05
Publication date: 2019-05-15
Anticipated expiration: 2037-07-05
Also published as: TW201807316A; KR20190025904A; DE102016112570A1; JP2019521272A; CN109477484A; US20190257310A1; WO2018007443A1; EP3482078B1

Abstract

The invention relates to an oil-lubricated rotary vane vacuum pump (1) comprising a rotary vane unit (2) that includes a rotary vane chamber (5) and a rotary vane rotor (6), the vacuum pump further comprising an oil separation and reprocessing device (3) in which oil and gas that have penetrated into the rotary vane unit (2) are separated by a separation device (T1, T2) preferably formed by a filter element and/or a gravitational and/or impact separator (24) and/or a fine particle separator (25), preferably along with an oil foam decomposition device and/or with an oil cooler and/or with an oil pump; one or more monitoring and/or maintenance devices (37) are provided for said devices, and the oil separation and reprocessing device (3) is accommodated in an oil separation and reprocessing housing (13) that includes side walls (14, 15), a base (16), a top (17) and face walls (18, 19), the side walls (14, 15) extending transversely to a plane of rotation of the rotary vane rotor (6) and defining a longitudinal direction of the oil separation and reprocessing housing (13). In order to improve a rotary vane vacuum pump of said type in particular in respect of the oil separation process while providing the vacuum pump with a design that is favorable for handling and/or maintenance and/or manufacturing purposes, the gas successively flows through two separation devices (T1, T2) within the oil separation and reprocessing housing (13), and said two separation devices are both accessible for maintenance from a face wall (18).

Description

description

Oil lubricated rotary vane vacuum pump. Field of engineering

The invention relates to an oil-lubricated rotary vane vacuum pump with a rotary valve unit, comprising a rotary valve chamber and a rotary valve rotor, and with a Ölabscheide- and Wiederaufbereitungs- device, wherein in the Ölabscheide- and reprocessing a separation of oil and gas, the Rotary slide unit has interspersed, is carried out by a separating device, which is preferably formed by a filter element and / or by a gravity and / or impact and / or a fine separator, preferably together with a Ölschaumabbau- device, and / or with an oil cooler wherein one or more monitoring and / or maintenance devices are provided for said devices and the oil separation and recycling device is housed in an oil separation and recycling housing, with side walls, a bottom wall, a top wall and end walls, the side walls extend transversely to a plane of rotation of the rotary valve rotor and specify a longitudinal extension of the Ölabscheide- 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 vane fan with a rotary vane housing forming a rotary vane space, which rotary vane space is designed in the form of a cylindrical bore. The rotary valve rotor is usually cylindrical, with sliders which are slidably disposed in slots of the rotor. The slots in the rotor may be strict with respect to a cross section through the rotor be radially aligned or extending at an acute angle to a radial. The bearing of the rotor is given preference according to the prior art in the region of the rotary valve housing each end-terminating side cover. The rotor rotates radially during operation of the vacuum pump to the central axis of the rotary valve housing. This results, separated by the sliders arranged substantially radially displaceable, closed chambers whose size changes during a revolution 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 introduced into the rotary valve housing. This adds gaps between the various components. Thus, the gas exchange between the adjusting chambers is obstructed between the sliders. In this way, higher vacuums are achieved during operation than with so-called dry-running rotary vane vacuum pumps.

The oil is conveyed by design, together with the pumped gas from the last chamber in the outlet. In addition, due to the enthalpy of compression in the system, the oil is heated. Also, the oil may contaminate contact with the fluid or change as a result of any chemical reactions. This results in a preferred treatment of the oil after leaving the blower area. It is known in this regard to run the oil in a cycle through the device. Further, it is known to perform the oil treatment process essentially in three sub-processes. So first, a separation of oil and gas, possibly in several stages. A coarse separation of large oil droplets by a corresponding filter element may be provided, as well as alternatively or in combination with gravitational and / or impact separation by redirecting the gas-oil mixture and alternatively or in combination by slowing down the flow. For separating oil and gas, a fine separation may further be provided, wherein the gas flow is conducted, for example, through a special filter mat. In a further sub-process, the degradation of oil foam can be provided. Air bubbles trapped in the oil can enter the rotary valve space in the form of foam and impair the function of the pump.

One or more monitoring and / or maintenance devices may be provided, for example an electric oil level sensor and / or an oil level gauge and / or an oil temperature monitor.

Moreover, it is known to accommodate the Ölabscheide- and reprocessing device in a separate from the rotary valve housing, but possibly coupled Ölabscheide- and reprocessing housing. The side walls of such a housing extend transversely to the rotational direction of the rotary slide rotor and thus preferably substantially in the axial direction of extension of the rotary slide rotor.

Summary of the invention

[0009] In view of the state of the art presented, the invention is concerned with the problem of a rotary vane vacuum pump of the type in question in handling and / or maintenance and / or manufacture. technically favorable embodiment, in particular with regard to the oil separation to further improve.

A possible solution to the problem is given according to a first idea of the invention in an oil-lubricated rotary vane vacuum pump, in which it is arranged that the gas successively flows through two separating devices within the oil separation and recycling housing, both from an end wall to the Maintenance are accessible.

According to the invention, at least two separation devices for separating oil and gas are provided in the gas flow direction. This results in an overall improved oil separation. The considered in the flow direction of the first separator may be a Feinabscheideeinrichtung that in the flow direction second separator a Nachabscheideeinrichtung, for the separation of fine to fine oil particles from the gas stream.

Both separation devices are arranged within the oil separation and reprocessing housing. Any interfaces on the housing for the connection of an external, according to additionally assignable separator are not necessary. Such interfaces, as well as lines thereof, such as hoses to an external separator, present potential risks to operation. By the joint arrangement of both separators within the same oil separation and recycling housing, internal grounding of both components is also common with the other components accommodated in this housing. Static discharges and flying sparks can be safely avoided. The downstream in the flow direction separating devices provide a step-like deposition.

The preferred accessibility of both separating devices via an end wall of the oil separating and recycling housing proves to be favorable in terms of handling, in particular in a preferred rear arrangement of the separating devices, the one separating device being viewed from the end wall behind the separating device which is initially visible from the end wall at least partially hidden.

Further features of the invention are explained below, also in the description of the figures, often in their preferred assignment to the subject matter of claim 1 or to features of further claims. But they can also be in an assignment to only individual features of claim 1 or the respective further claim or each independently of importance. The two separating devices can be used individually and removable in a possible embodiment. The insertion or removal can, as preferred, be carried out in a predetermined order. In addition, the removal of the other separator may initially be required to remove a separator. In an alternative embodiment, the two separating devices can also be combined for joint insertion and removal connected to each other. Such a connection can be canceled after a removal, for example, to exchange only a separator. The insertion and removal can each relate to the entire separating device (first and / or second separating device). It is possible in this regard, only the removal or insertion of filter elements of the separation devices. These filter elements alone can be accessible via the one end wall. Also, the arrangement may be selected so that a separating device for maintenance or replacement is completely removed from the housing, while in the second separating device preferably only the associated filter element can be removed as part of a normal maintenance. The gas path between the first separation means in the gas flow direction and the second separation means in the gas flow direction may, as is preferred, be valve-free. The result is preferably a pressure loss-free transition from the first separating device into the second separating device, wherein in a preferred embodiment of the gas path between the dividing devices predetermining line section is given by the oil separator and reprocessing housing.

The viewed in the gas flow direction length of the gas path between the gas flow direction first separator and the gas flow direction second separator may correspond to a diameter or less of the first separator. The length of the gas path may tend to zero, with an immediate (linear) sequential ranking of the two separators. The diameter dimension of the first separating device preferably relates to a greatest extent of extent in a cross section transverse to the longitudinal extent or transversely to the gas flow direction within the separating device, in this case based on the filter material serving for the oil separation. In a preferred kreiszylinderförmi- gene embodiment of the first separator or its Abscheidefilters results in the maximum extent dimension in cross section through the diameter. For example, in an exemplary rectangular cross-section of the filter material, the foregoing diameter dimension corresponds to the longest extent dimension in the cross-sectional area. In the separation devices are Feinabscheider- or Luftentölelemente, further so-called oil mist, wherein the downstream in the gas flow direction second separator in a preferred embodiment has a higher separation efficiency compared to the first separator and thus a higher particle filter class. Also, as preferred, the one or more monitoring and / or maintenance devices may be disposed only in three lid portions attached to the two end walls of the oil separation and recycling housing, the oil separation and regeneration housing being otherwise provided with sidewalls, a bottom wall, a ceiling wall and end walls can be configured without a configuration for a monitoring and / or maintenance device.

The lid parts may be associated with the end walls of the Ölabscheide- and reprocessing housing. For example, an end wall may be designed as a rear side cover and a service cover may be associated with a front wall which is customary in operation. In addition, a removable service cover can be arranged in particular on the service cover for maintenance purposes.

In addition, the monitoring and / or maintenance facilities, more preferably all common in normal operation of the vacuum pump monitoring and / or maintenance facilities share in or on the three lids be provided. Furthermore, frequently used monitoring and / or maintenance devices can be provided in the service cover or in the service cover that can be arranged on the service cover or can be reached via it. Essential functions are preferably in the region of the three cover parts or are feasible in the field of this. These are in particular oil filling and / or controlling oil and / or oil and / or drain oil and / or attach one or both separators and / or provide access for the maintenance of one or both separators and / or attach a float device and / or or access to the

Create floatation device and / or make room for separated oil and / or create return for collected oil and / or intake for the maintenance cover and / or dividing into the upper and lower space of the oil separation and recycling housing and / or connection of a Ölbad- heater and / or connect a water cooling and / or connection for filters and / or connection for the vacuum pump downstream elements and / or blown air in a defined direction.

The actual Ölabscheide- and reprocessing without the aforementioned cover parts is preferably without relevant function, at least concerning the user interface. Thus, this housing can be easily performed. Thus, in particular the top wall and the bottom wall, more preferably at least one external side wall can be formed without preparations for the arrangement of relevant devices.

The float device is in general terms a control for the flow from the upper to the lower chamber. In particular, it is influenced by an oil level in the upper chamber. One Exceeding a certain predetermined oil level should be avoided. One can also call it a so-called valve. Hereinafter, this device is always referred to as a float device for the sake of simplicity. Via this floating device, the common oil return of the separated oil of both separating devices into the oil circuit takes place.

[0029] In a further embodiment, the one or more monitoring and / or maintenance devices can be arranged on a removable maintenance cover of the oil separation and reprocessing device, one or both separation devices and / or a float device being accessible for maintenance when the maintenance cover is removed.

The one or more monitoring and / or maintenance devices may be associated with a housing portion of the oil separation and reconditioning device, in which region a removable service cover may be 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 region. This reduces the space required for the rotary vane vacuum pump in the installation and use areas. By removing the service cover from the oil separation and recycling housing, access to components of the oil separation and recycling device may be allowed, particularly access to one or both of the separation devices and / or to one

Float device. Such a float device may be required in order to selectively flow the gas stream through the one or more separators, given pressure differences in the area of the oil separation and reprocessing device during operation of the vacuum pump. In this case, separated oil in a cavity, preferably formed collected in a service cover forming an end wall of the oil separation and recycling housing. In the cavity, which can also be referred to as oil collecting space, a hollow body is arranged, connected to a joint, preferably a rotary joint, and a seal. The seal blocks the oil return. If the oil level rises, the hollow body floats and the joint is raised via the joint, which releases an opening in the oil return.

The maintenance cover may be formed and arranged so that the oil behind it in the oil separation and recycling housing can not escape upon removal of the maintenance cover, the maintenance cover may be located in the region of an end wall of the Ölabscheide- and reprocessing housing. The maintenance cover can also be arranged on a service cover associated with an end wall of the oil separation and recycling housing. The Ölabscheide- and reprocessing housing can with respect to its

Longitudinal extension consist of a profile of the same cross-section. Such a profile may be an extruded profile, in particular an aluminum extruded profile. It is thus in particular the housing of Ölabscheide- and reprocessing plant low cost. The contour is preferably identical at each point of the longitudinal axis of the housing part. With respect to an extruded profile, an aluminum wrought alloy is forced through a two-dimensional die to create an elongate profile which can be cut to the preferred length. This provides the production of such a housing with dimensionally stable contours over the entire length. The outer surfaces may be optically clean and evenly formed. Further work steps, in particular surface processing steps, can be omitted in particular in the production of an extruded profile. In addition, according to the proposed embodiment of the housing, the surface thereof can be represented as a design-giving element.

The profile of the same cross-section, preferably the extruded profile, offers the possibility to change the volume of Ölabscheide- and reprocessing device and adapt the application needs.

As far as above and below an extrusion profile reference is made, this is always understood in a more general version as a profile same cross section. It can further be provided that the maintenance cover forms part of an end wall of the oil separation and recycling housing or the entire end wall. The end wall may be oriented in the use position of the vacuum pump facing an operator or control person. The maintenance cover, in a preferred embodiment, sealingly covers an opening provided in the end wall of the housing, through which, for example, the one or both separation devices and / or the float device are accessible for maintenance. Thus, the maintenance cover with respect to its top surface have a size corresponding to the 0.25 to 0.5 times the outwardly facing end face of the end wall. The separating means may be arranged with respect to the flow direction in the longitudinal direction of the Ölabscheide- and reprocessing device. More preferably, the arrangement of the separating devices is selected with respect to the flow direction in the longitudinal direction of the housing extrusion profile. Preferably, the maintenance cover is arranged in extension of at least one of the separating devices in the region of the end wall. A longitudinal center axis of the separating device can enforce the maintenance cover in the region of its broad side surfaces in extension thereof. After removal of the maintenance cover can, for example, from the separating device formed as a fine separator, the filter element, preferably in the form of a special filter mat, are removed. As a result, for example, it can simply be exchanged for a new filter element.

[0038] A side wall is provided between the rotary valve unit and the oil separation and reprocessing device. It may be the side wall of the oil separation and recycling housing. The side wall may have a passage opening through which compressed gas containing oil from the rotary valve unit may enter the oil separation and recycling device. The incoming gas with oil content can flow in a first section of Ölabscheide- and reprocessing device in countercurrent to a second section, in which second section the oil separation, for example. Fine separation takes place. In this case, as is also preferred, the flow direction can be given in the longitudinal extent of the oil separation and reconditioning housing, and thus more preferably in the longitudinal extension of the extruded profile. This is a significant direction of flow 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 to the other of the housing. Below the passage opening, a subsequent as a flow path housing portion may be formed, in which enters separated from the gas oil as a result of heavy and / or centrifugal force. The housing portion may serve to receive an oil sump, thus may be further formed in the manner of an oil pan. About a gravity and / or centrifugal separation is preferably a first separation of gas and oil.

In order to allow an oil change, if appropriate also a connection of an oil cooling circuit, the housing section has at least one oil outlet opening. This can, as also preferred, be formed in a setting in the on and use state of the vacuum pump vertically lowest region of the housing portion, more preferably the ground of the same. More preferably, the oil outlet opening is closed.

Also, the oil outlet opening may be accessible from an end wall of the Ölabscheide- and reprocessing 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.

[0043] In particular for the separation of particles from the oil separated from the gas, an oil filter through which the oil located in the housing section can be conducted can furthermore be provided in the housing section or assigned to it. It may, as preferred, be a replaceable oil filter.

The guided through the oil filter oil is preferably introduced into the rotary valve chamber. For this purpose, a pump may be provided which sucks the oil collecting in the housing section through the oil filter and conveys it into the rotary valve chamber of the rotary valve aggregate. Is preferred a training without a pump, in which the pressure difference between the Olsammelraum and the working space of the vacuum pump is used for oil extraction.

In the Feinabscheideeinrichtung (first separator) may be provided a filter mat. This filter mat is preferably interchangeable, wherein such a change takes place in a preferred embodiment of the one, the maintenance cover having end wall ago after removing the maintenance cover.

The filter mat may be tubular with an inner flow path for the gas / oil mixture. In the fine separator, separated oil flows in a preferred embodiment via the Nachabscheider (second separator) and the float device in the oil collection chamber housing portion.

Due to the flow resistance of the filter elements (filter mat) in the separating devices results in a pressure difference before and after the Feinabscheideeinrichtung. This can be up to 400 mbar, depending on the volume flow that the pump currently delivers.

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

Also, a level indicator may be provided on the end wall, optionally in or on the service cover. The oil level of the vacuum pump can be read off via this. This can be a standard sight glass, alternatively an analog or digital readout. Also, in the front wall, optionally in the service cover, a pressure relief valve or a rupture disc can be arranged. Such a pressure relief valve or a rupture disc serves as protection against a sudden overpressure in the device. In a possible arrangement of a burst protection in the maintenance cover, the safe operating state can be restored after an event in handling technology simple way, for example, by changing the maintenance cover total.

In a further embodiment, a temperature monitoring element can be arranged in the end wall, optionally in the maintenance cover or associated with the maintenance cover. This is used in particular for oil temperature monitoring.

In a possible embodiment, the gas separated from the oil can escape through the end wall, for example through the service cover. For this purpose, the end wall, in particular the maintenance cover on a corresponding outlet opening.

In one possible embodiment, the maintenance cover has a gas outlet connection. This can be designed to connect a silencer or a continuation element. Thus, the guest outlet in a first embodiment of the maintenance cover can be further equipped with a thread. An outlet piping can be connected to this. The thread can also be used to connect a bursting valve. Optionally, the burst valve may also be located and secured in the outlet piping. If necessary, a pipe, a silencer or other gas guide elements may be connected. By changing the maintenance cover, a suitably equipped maintenance cover can also be arranged when in-use device. In a further embodiment, the guest outlet nozzle may be provided with an optionally removable deflection cap, in which the escaping gas is deflected at least by 60 ° with regard to its outlet direction given at the gas outlet nozzle. Preferably, the deflection is chosen so that the escaping gas flows directed downwards. As a result, the noise level during operation of the vacuum pump is reduced because the sound is directed in one direction to the ground. Also, the gas outlet nozzle can be rotatably mounted on the service cover, so that, for example, a deflection to the side or upwards is possible. The Ölabscheide- and reprocessing housing may have an integrally formed chamber with a stand-up in terms of gravity lower and an upper chamber, wherein in the longitudinal direction of Ölabscheide- and reprocessing housing front and back an end wall may be connected. The integral formation of chambers can in the course of the preferred production of the housing from a

Extruded profile can be formed. The upper chamber is used in a preferred embodiment, in particular for receiving the separating devices, while the lower chamber during operation of the vacuum pump forms the above-described housing portion. The end walls to be connected in each case form an end closure of the oil separation and recycling housing. One of the end walls may have an opening covered with the above-described maintenance cover.

At least one end wall in this case preferably forms a connection of the chambers. In a preferred counter-directed flow within the chambers, at least one end wall can form gas deflection regions. The passage opening from the rotary valve unit or from the rotary valve chamber to the Ölabscheide- and reprocessing device opens in a preferred embodiment in the lower chamber of the Ölabscheide- and reprocessing housing. When viewed in the direction of flow, preferably the gravitational force t and / or impact separator adjoins this passage opening.

Further, the lower chamber forms in a preferred embodiment of an oil collection container.

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

Brief description of the drawings

Below, the invention with reference to the accompanying drawings, which illustrates only one embodiment, explained in more detail. It shows:

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

Fig. 2 is the plan view for this purpose;

Fig. 3, the vacuum pump in a side view overlooking a

End wall with a maintenance cover;

4 shows the section along the line IV-IV in Figure 3; 5 shows the section along the line VV in Figure 2;

6 shows the Ölabscheide- and reprocessing housing in perspective detail view;

7 is a perspective detail view of the end wall with associated maintenance cover and a fixable on the maintenance cover gas outlet nozzle.

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

Fig. 9, the Ölabscheide- and reprocessing housing in one

Section;

10 shows the section along the line X - X in Figure 2.

Description of the embodiments

With reference to FIG. 1, there is shown and described an oil-lubricated rotary vane vacuum pump 1 with a rotary vane unit and an oil separation and reprocessing device 3.

The rotary valve unit 2 has an aggregate housing, in which a rotary valve chamber 5 are arranged with a rotary valve rotor 6. The unit housing is covered by a hood 4 and by with respect to a longitudinal axis respectively end side covers 11 and 12. The rotary valve chamber 5 is formed in the manner of a cylindrical bore in the unit housing. The rotary valve chamber 5 has a longitudinal extension, which is oriented on the bore axis of the rotary valve chamber 5.

The cylindrical rotary slide rotor 6 is arranged eccentrically relative to the rotary slide chamber 5. Accordingly, the rotor axis x is parallel but offset from the axis of space.

The rotary valve rotor 6 has a plurality, in the exemplary embodiment, three slides 7. These are arranged to move in a cross-section approximately radially aligned slots 8 of the rotor 6. The slide 7 are pressed by the rotation of the rotary valve rotor 6 according to centrifugal force against the rotary valve chamber 5 bounding wall.

During operation of the vacuum pump 1, the rotary valve rotor 6 rotates radially offset from the central axis of the rotary valve chamber 5, according to this drive via a rotationally acting on the rotor shaft motor, in particular electric motor 9. This results, separated by the radially displaceably arranged slide 7, closed chambers 10 whose size changes during a revolution of the rotary valve rotor 6.

The rotary valve chamber 5 is closed with respect to its longitudinal axis at each end by rotary valve side covers 46 and 47 (see FIG.

Outside the unit housing, for example associated with the side cover 12, the electric motor 9 is preferably fixed to the unit housing. The shaft of the rotary valve rotor 6 can enforce the relevant side cover 12 for rotationally fixed attack 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 blower 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 valve units 2 are characterized in that in this oil is introduced into the rotary valve chamber 5. Through this oil gaps between the various components, in particular between see the sliders 7 and the wall of the rotary valve chamber 5 is added. Thus, the gas exchange between the various chambers 10 is hindered. In this way, higher vacuums are achieved during operation than is possible with dry-running rotary vane pumps.

The oil is due to the design together with the pumped gas from the last chamber 10 of the rotary valve unit 2 promoted out. In addition, the oil is heated due to the enthalpy of compression in the system. As the oil comes into contact with the fluid (gas), it may become dirty or change due to possible chemical reactions.

The oil runs in a cyclic process through the vacuum pump 1. It follows that this, after it has left the rotary valve unit 2, must be recycled. The oil separation and reprocessing device 3 serves this purpose. The device 3 is connected to the rotary valve unit 2, so that a unit is formed, consisting of rotary valve unit 2, oil separation and reprocessing device 3 and electric motor 9.

The oil separation and reprocessing device 3 initially has an oil separation and recycling 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 extent of the housing 13, which longitudinal extent corresponds to the longitudinal extension of the rotary valve chamber 5 of the rotary valve unit 2, in each case at the end of the side walls 14 and 15, the bottom wall 16 and the top wall 17 integrally forming Housing arranged, in particular screw-connected to the housing. The end wall 18 is preferably formed by a service cover and the end wall 19 by a rear side cover. The housing 13 may consist of an extruded profile 20, in particular of an extruded aluminum profile with respect to its longitudinal extent. Thus, the Ölabscheide- and reprocessing housing 13 over its length to a substantially constant cross section, this viewed over the longitudinal extent while maintaining a dimensionally stable contour. In addition, in a production of the housing 13 in the extrusion process, the outer surfaces are optically uniform and clean, so that surface processing steps for visual enhancement of the surface can be omitted. Only necessary processing steps, such as openings in the side walls and / or bottom wall and / or ceiling wall can be provided. Also, the production of the housing 13 can be used in the extrusion process to the effect that in addition to the surface and the shape of the housing can be designed so that this is finally the design-giving element. The side walls 14 and 15 extend transversely to a plane of rotation of the rotary slide rotor 6, wherein in the illustrated embodiment the side wall 14 at the same time represents the fastening plane for fastening the oil separation and recycling housing 13 to the unit housing. The end wall 18 arranged at the end closes in one possible

Design outside the wall with the adjacent side cover 11 from, as well as more preferably the ceiling wall 17 and the bottom wall 16 with the adjoining thereto adjacent wall sections of the unit housing. This results in 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 corrugated with respect to a cross section in the plane of rotation of the rotary valve rotor 6 (cf., in particular, FIG. It results over the considered in cross section Erstreckung length of the side wall 15 uniform, rounded elevations, which are connected to each other via valleys. As a result, an enlargement of the surface in the region of the side wall 15 is achieved, and thus an improvement in 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 Ölabscheide- and reprocessing housing 13 has a preferably integrally formed chambering. With respect to a state of erection, 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 cross-section according to FIG. 9 transverse to the side walls 14 and 15 extending divider 23rd

In the Ölabscheide- and reprocessing device takes place during operation of the vacuum pump 1 in particular a separation of oil and gas.

For this purpose, a gravity and / or impact separator 24 and a downstream in the gas flow direction, two-stage separator is provided, which is composed of a first separator Ti in the form of a Feinabscheideeinrichtung 25 and a downstream second separator T ₂ in the form of a Nachabscheideeinrichtung 43.

The oil / gas mixture passes from the rotary valve unit 2 via a passage opening 26 in the region of the side wall 14 in the Ölabscheide- and reprocessing device 3 a.

With entry into the device 3, a coarse separation of large oil droplets by the gravity and / or impact separator 24 is preferably carried out initially according to deflection of the gas-oil mixture and slowing down of the flow.

The entry of the oil-gas mixture into the device 3 takes place according to a corresponding arrangement of the passage opening 26 in the region of the lower chamber 21, in which a separator T ₃ , approximately in Form of a gravity and / or impact separator 24, may be arranged.

The resulting under the passage opening 26 in the region of the lower chamber 21 housing portion 27 serves in the manner of an oil pan, in which collects an oil sump. It is thus formed in the lower chamber 21, an oil reservoir.

Further, the lower chamber 21 forms a flow path having a flow a oriented along the longitudinal direction of the housing. This flow a is directed towards the rear end wall 19. In order to avoid a fluidization of the oil collecting in the oil sump by the gas flow, the area of the oil sump is covered by a retracted filter plate 44.

The inside wall of the end wall 19 is designed to divert 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.

In the upper chamber 22, the separators Ti and T _{2 are provided} in a linear sequential arrangement.

The fine separation device 25 (separation device Ti) has a tubular filter mat 42, the tube axis of which is preferably rectified relative to the rotor axis x of the rotary valve rotor 6. Thus, the fine separation device 25 is oriented substantially in the longitudinal direction of the oil separation and recycling housing 13. In the gas flow direction b downstream of the fine separation device 25, a Nachabscheideeinrichtung 43 is provided in the upper chamber 22. The gas exiting from the fine separator 25 is inevitably passed through the Nachabscheideeinrichtung 43. The length c of the gas path between the first separator Ti (fine separator 25) in the gas flow direction b and the second separator T ₂ (secondary separator 43) in the gas flow direction b corresponds to approximately one quarter to one third of the diameter dimension of the first separator Ti (relative to the largest Cross-sectional extent of the filter-effective element). The redirected from the lower chamber 21 into the upper chamber 22 oil-gas mixture is selectively and successively passed through the two separators Ti and T ₂ , wherein before the first separator Ti and behind the second separator T _2, a pressure difference results, which can be up to 400 mbar depending on the delivery pressure of the rotary valve unit 2.

Further, in the oil separation and reprocessing device 3, an oil scavenging device may be provided.

In addition, an oil filter 28 is provided. This can be arranged assigned to the bottom region of the oil separation and recycling housing 13, more preferably the rear end wall 19. Through the oil filter 28, the oil in the oil sump is sucked and in particular freed of 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. By means of an external cooler, not shown, a cooling of the particular filtered oil can be made. For this purpose, corresponding inlets and outlets are provided in the region of the lower chamber 21.

Also, in the profile of the housing 13, for example in the region of the bottom wall 16 and / or the side walls 15 (associated with the lower chamber 21), cooling paths may be provided.

The in the use state preferably an operator facing end wall 18 leaves the inside wall a passage for connecting the upper chamber 22 to the lower chamber 21, which passage is formed by a float means 30 on the two separators Ti and T ₂ deposited oil is returned to The reservoir in the region of the lower chamber 21 is guided by the float device 30. This prevents, according to the above-described pressure difference upstream and downstream of the separators Ti and T _2, 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 heating may be provided to heat the oil before the start of the vacuum pump 1.

In addition, an 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, an upper wall 22 is assigned to the upper chamber 22. At least approximately over the entire cross-sectional area of the upper chamber 22 extending, window-like opening 32 is provided. This is closed by a maintenance cover 33 during operation of the vacuum pump 1. The maintenance cover 33 may be screwed to the end wall 18, preferably with the interposition of a seal.

In the maintenance cover 33, the gas outlet 31 is provided. For this purpose, the maintenance cover 33 has a passage opening 34, to which the outside of the maintenance cover 33, a gas outlet nozzle 35 can connect. The gas outlet port 35 may be formed in the form of a removable Umlenkkappe 36, in which the escaping gas with respect to its given at the gas outlet nozzle orientation - which is substantially rectified as the flow b in the upper chamber 22 - at least 60 °, preferably is deflected down to 90 ° down in the direction of the given by the bottom wall 16 level. As a result, the sound is directed towards the ground, resulting in a reduction of noise pollution.

Preferably, the gas outlet pipe 35 is rotatably mounted on the service cover 33, so that the exhaust air can optionally be deflected, for example, to the side or upwards. The deflection cap 36 can be exchanged, for example against a gas outlet connection for connecting a silencer or a forward contact element. In addition, a maintenance cover 33 with Umlenkkappe 36 can be exchanged for a maintenance cover 33 for connecting, for example, an external piping.

The Ölabscheide- and reprocessing device 3 has several monitoring and / or maintenance facilities 37. Thus, in the end wall 18, associated with the lower chamber 21, a level indicator 38 may be provided to determine the amount of oil. The level indicator 38 may be formed by an oil sight glass and / or by an electric oil level sensor.

A possible oil temperature indicator can also be arranged in the region of the end wall 18.

Further, in the end wall 18 both the inlet and the outlet for changing the oil in the oil separation and reprocessing device 3 may be provided. For this purpose, in an embodiment in the end wall 18, an oil outlet opening 39 and a filler neck 40 are provided. After removal of the end wall 18 associated maintenance cover 33 both separators Ti and T ₂ and the float device 30 for maintenance and, if necessary, replacement of the operating side of the vacuum pump 1 ago accessible.

Thus, after removal of the end wall 18, the second separation device T ₂ (post-separation device 43) is initially free. This can be taken out of the upper chamber 22 accordingly. The Nachabscheideeinrichtung 43 may here, for example, be mounted on a carriage-like frame 45. Nachabscheideeinrichtung 43 can be removed in one embodiment together with the frame 45 from the upper chamber 22, after which the Filter mat 42 of Feinabscheideeinrichtung 25 also exposed for removal or can be accessed on the filter mat 42 for maintenance purposes.

The gas path between the two separation devices Ti and T ₂ is valve-free and, in the exemplary embodiment shown, is surrounded by the material of the oil separation and regeneration housing 13 in the region of the upper chamber 22 with reference to a cross section alone.

The Nachabscheideeinrichtung 43 may have a substantially enforceable in the flow direction b filter mat or the like.

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

The pressure relief valve serves as protection against a sudden overpressure 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 the interfaces relevant to the operator are preferably accommodated in the area of the end walls 18, 19, thus accommodating the space required for reduces the device, increases the ease of maintenance and the manufacturability of the Ölabscheide- and reprocessing housing is simplified.

[00123] The above explanations serve to explain the inventions as a whole, which in each case independently further develop the state of the art, at least by the following feature combinations, namely:

A rotary vane vacuum pump 1, characterized in that the gas successively flows through within the oil separation and regeneration housing 13, two separation devices Ti, T ₂ , both of which are accessible from an end wall 18 for maintenance.

A rotary vane vacuum pump 1, which is characterized in that both separating devices Ti, T _{2 are} individually used and removable.

A rotary vane vacuum pump 1, which is characterized in that both separating devices Ti, T ₂ combined for joint insertion and removal are connected to each other.

[00127] A rotary vane vacuum pump 1, which is characterized in that a gas path is formed between the first divider Ti in the gas flow direction b and the second divider T ₂ in the gas flow direction b.

[00128] An oil-lubricated rotary vane vacuum pump 1, which is characterized in that the length c of the gas path between the first separating device Ti in the direction of air flow b and the one in the air flow direction b is Separator T ₂ corresponds to a diameter or less of the first separator Ti.

List of reference numbers

1 vacuum pump 26 passage opening

2 rotary valve unit 27 housing section

3 oil separator and re28 oil filters

Preparation device 29 Suction line

4 hood 30 float device

5 rotary valve chamber 31 gas outlet

6 rotary valve rotor 32 opening

7 Slide 33 Maintenance cover

8 slot 34 passage opening

9 Electric motor 35 Gas outlet

10 chamber 36 deflection cap

11 Side cover 37 Monitoring and War¬

12 side cover processing device

13 Oil Separator and Re-start 38 Level Indicator

Preparation housing 39 drain opening

14 side wall 40 filler neck

15 side wall 42 filter mat

16 bottom wall 43 Nachabscheideeinrichtung

17 ceiling wall 44 filter sheet

18 front wall 45 frame

19 end wall 46 rotary valve side cover

20 extruded profile 47 rotary valve side cover

21 lower chamber

22 upper chamber

23 divider

24 gravity and / or impact separators

25 fine separator a flow b flow c length

x rotor axis

A cover part

B cover part

C cover part

Ti separator

T ₂ separating device

T ₃ separating device

Claims

claims

An oil-lubricated rotary vane vacuum pump (1) having a rotary vane unit (2), comprising a rotary vane space (5) and a rotary vane rotor (6), and having an oil separation and reconditioning device (3), wherein in the oil separation and reconditioning device (3) a separation of oil and gas that the rotary valve aggregate (2) has passed through a separator (Ti, T ₂ ), preferably by a filter element and / or by a heavy and / or impact separator (24) and or a fine separator (25) is formed, preferably together with a Ölschaumabbaueinrichtung, and / or with an oil cooler and / or with an oil pump, wherein one or more monitoring and / or maintenance device 37 are provided for said devices and the Ölabscheide- and reconditioning means (3) are housed in an oil separation and recycling box (13), having side walls (14, 15), a bottom wall (16) a ceiling wall (17) and end walls (18, 19), the side walls (14, 15) extending transversely to a plane of rotation of the rotary valve rotor (6) and defining a longitudinal extent of the oil separating and recycling housing (13), characterized in that the gas flows sequentially through two separators (Ti, T ₂ ) within the oil separation and recycling housing (13), both being accessible for maintenance from an end wall (18).

2. rotary vane vacuum pump according to claim 1, characterized in that both separating devices (Ti, T ₂ ) are individually used and removable.

3. rotary vane vacuum pump according to one of the preceding claims, characterized in that both separating devices (Ti, T ₂ ) combined for joint insertion and removal are connected together.

Rotary vane vacuum pump according to one of the preceding claims, characterized in that a gas path between the first separation device (Ti) in the gas flow direction (b) and the second separation device (T ₂ ) in the gas flow direction (b) is valve-free.

Rotary vane vacuum pump according to one of the preceding claims, characterized in that the length (c) of the gas path between the first separating device (Ti) in the air flow direction (b) and the second separating device (T ₂ ) in the air flow direction (b) has a diameter dimension or less first separator (Ti) corresponds.

Rotary vane vacuum pump according to one of the preceding claims, characterized in that a further separating device (T3), for example in the form of a gravity and / or impact separator (24), is provided.