DE102016112570A1 - Oil lubricated rotary vane vacuum pump - Google Patents

Abstract

The invention relates to an oil-lubricated rotary vane vacuum pump (1) with a rotary valve unit (2), comprising a rotary valve chamber (5) and a rotary valve rotor (6), and with a Ölabscheide- and reprocessing device (3), wherein in this a separation of Oil and gas that the rotary valve unit (2) has passed through a separation device (T1, T2), preferably by a filter element and / or by a gravity and / or impact separator (24) and / or a fine separator ( 25), preferably together with an oil scavenging device, and / or with an oil cooler and / or with an oil pump, wherein one or more monitoring and / or maintenance devices (37) are provided for said devices and the oil separation and reprocessing device ( 3) is housed in an oil separation and recycling housing (13), with side walls (14, 15), a bottom wall (16), a top wall (17) and stem nwänden (18, 19), wherein the side walls (14, 15) extend transversely to a plane of rotation of the rotary valve rotor (6) and predetermine a longitudinal extent of the Ölabscheide- and recycling housing (13). In order to further improve such a vacuum pump, it is proposed that the gas flow successively through two separation devices (T1, T2) within the oil separation and recycling housing (13), both being accessible for maintenance from an end wall (18).

Description

Field of engineering

The invention relates to an oil lubricated rotary vane vacuum pump with a rotary valve assembly comprising a rotary valve chamber and a rotary valve rotor, and with a Ölabscheide- and reconditioning device, wherein in the oil separation and recycling device, a separation of oil and gas, which has penetrated the rotary valve assembly , 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 Ölschaumabbaueinrichtung, and / or with an oil cooler, wherein said devices or a plurality of monitoring and / or maintenance devices are provided and the Ölabscheide- and reprocessing device is housed in a Ölabscheide- and reprocessing housing, with side walls, a bottom wall, a ceiling wall and end walls, wherein the side walls transverse to a Rota Extending tion level 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 slide fan with a, a rotary valve space forming rotary valve housing, which rotary valve space is formed 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 strictly radially aligned with respect to a cross section through the rotor, or may be 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.

During operation of the vacuum pump, the rotor rotates radially offset from 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 size change 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 in operation than in 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.

Furthermore, it is known to carry out the oil treatment process substantially in three sub-processes. So first, a separation of oil and gas, possibly in several stages. It may be a coarse separation of large oil droplets provided by a corresponding filter element, as well as alternatively or in combination, a gravity 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 electrical oil level sensor and / or an oil sight glass 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 extending transversely to the rotational direction of the rotary valve rotor and thus preferably substantially in the axial extension direction of the rotary valve rotor.

Summary of the invention

In view of the stated prior art, the invention is concerned with the task, a rotary vane vacuum pump of type in question in terms of handling and / or maintenance and / or manufacturing technology favorable design, in particular with regard to the oil separation to further improve.

A possible solution of the problem is given according to a first idea of the invention in an oil-lubricated rotary vane vacuum pump, which is geared to the fact that the gas successively flows through two separation devices within the Ölabscheide- and reprocessing, both of which are accessible from an end wall for maintenance.

According to the invention, at least two separating 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 separators are disposed within the oil separation and recycling 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 laxative lines, such as hoses to an external separator, pose potential risks to the operation.

The joint arrangement of the two separation devices within the same Ölabscheide- and reprocessing housing an internal grounding of both components, in addition to the other housed in this housing components, allows. Static discharges and flying sparks can be safely avoided.

The downstream in the flow direction separators offer a step-like deposition.

The preferred accessibility of both separating device via an end wall of Ölabscheide- and reprocessing housing proves to be handling technology favorable, especially in a preferred sequential arrangement of the separation devices, viewed from the front wall which is a separating device behind the first visible from the end wall separating device is at least partially hidden ,

Further features of the invention are explained below, also in the description of the figures, often in their preferred association with the subject matter of claim 1 or with 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 separation 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 with one another for joint insertion and removal. 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 device in the gas flow direction and the second separation device in the second gas flow direction may, as is preferred, be valve-free. The result is preferably a pressure loss-free transition from the first separator into the second separator, wherein in a preferred embodiment of the gas path between the separators predetermining line section is given by the Ölabscheider- and reprocessing housing.

The length of the gas path viewed in the gas flow direction between the gas flow direction first separator and the gas flow direction second separator may correspond to a diameter dimension or less of the first separator. The length of the gas path may tend to zero, with an immediate (linear) series 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 oil separation serving filter material. In a preferred circular cylindrical configuration of the first separating device or its separating filter, the maximum extent of extension in cross section results from the diameter measure. 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.

The separating devices are fine-separator or air-deadening elements, also known as oil mist separators, the second separating device arranged downstream in the gas flow direction preferably having a higher separation efficiency and thus a higher particle filter class than the first separating device.

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 incidentally having side walls, 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 devices, more preferably all relevant in normal operation of the vacuum pump monitoring and / or maintenance facilities may be provided in or on the three cover parts. 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 area 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 provide access to the floatation device and / or make room for separated oil and / or return for collected oil and / or intake for the maintenance cover and / or dividing into upper and lower space of the oil separation and recycling housing and / or connection of an oil bath heating 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 housing 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. 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. About this floating the common oil return of the separated oil of both separation devices takes place in the oil circuit.

In another 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, wherein one or both separators and / or a float device are accessible for maintenance when the maintenance cover.

The one or more monitoring and / or maintenance devices may be associated with a housing portion of the oil separation and recycling 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 service cover, but optionally also in the immediate vicinity of the service 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 service cover from the oil separation and recycling housing, access to components of the oil separation and reconditioning device may be enabled, in particular access to one or both separating devices and / or a 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 is collected in a cavity, preferably formed in a service cover forming an end wall of the oil separation and regeneration housing. In the cavity, which can also be referred to as oil collection chamber, a hollow body is arranged, connected to a joint, preferably a rotary joint, and a seal. The seal blocks the oil return. When the oil level rises, the hollow body floats and over the joint, the seal is raised, which opens an opening of the oil return.

The service cover may be configured and arranged such that the oil behind it can not escape into the oil separation and recycling housing upon removal of the service cover, wherein the service cover may be disposed in the region of an end wall of the oil separation and regeneration 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 may consist of a profile of the same cross-section with respect to its longitudinal extent. 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 can be optically clean and evenly formed. Further work steps, in particular surface processing steps, can be dispensed with in particular during production from 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 of changing the volume of the oil separation and reprocessing device and adapting it to the application requirements.

Insofar as reference is made above and below to an extruded profile, this is always to be understood more generally as a profile of the 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 devices may be arranged with respect to the direction of flow 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 Feinabscheideeinrichtung 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.

Between the rotary valve unit and the Ölabscheide- and reprocessing device, a side wall is provided. 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 containing oil may flow in a first section of the oil separation and recycling device in countercurrent to a second section, in which second Section the oil separation, for example. Fine separation takes place. The flow direction can here, as further preferred, in the longitudinal extent of the Ölabscheide- and reprocessing housing, and thus more preferably be given in the longitudinal extent 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 of the housing to the other.

Below the passage opening, a housing section which adjoins as a flow path can be formed, in which oil separated from the gas runs in as a result of gravitational 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, possibly also a connection of an oil cooling circuit, the housing section has at least one oil outlet opening. This can, as also preferred, in a set-up and use state of the vacuum pump vertically lowest portion of the housing portion, more preferably the bottom of the same be formed. More preferably, the oil outlet opening is closed.

Also, the oil discharge opening may be accessible from an end wall of the oil separation and recycling housing. In a preferred embodiment, the oil outlet opening of the end wall is assigned, at which at the same time the maintenance cover is arranged.

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

The oil passed through the oil filter is preferably introduced into the rotary valve space. 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. Preference is given to a training without a pump, in which the pressure difference between the oil collecting space 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 internal flow path for the gas / oil mixture. In the fine separation device separated oil flows in a preferred embodiment on the Nachabscheider (second separator) and the float device in the oil collecting space having housing portion.

Due to the flow resistance of the filter elements (filter mat) in the separating devices, a pressure difference before and after the Feinabscheideeinrichtung results. 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. Over this the oil level of the vacuum pump is readable. This can be a standard sight glass, alternatively an analog or digital readout.

Also, in the front wall, optionally in the maintenance 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 exit 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 service 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 can be provided with an optionally removable diverter cap, in which the escaping gas is deflected by at least 60 ° with respect 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 having a in the erected state 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 be formed in the course of the preferred production of the housing from an extruded profile. 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 reprocessing 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 oil separation and reprocessing device opens in a preferred embodiment in the lower chamber of the oil separation and reprocessing housing. When viewed in the direction of flow, the gravity and / or impact separator preferably adjoins this passage opening.

Furthermore, the lower chamber in a preferred embodiment forms an oil collecting container.

Associated with the oil collecting container, one or more, preferably integrated in the extruded profile cooling lines can 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

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

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

2 the top view of this;

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

4 the section according to the line IV-IV in 3 ;

5 the section along the line VV in 2 ;

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

7 in a perspective single representation of the end wall with associated maintenance cover and a fixable on the maintenance cover gas outlet nozzle;

8th a further perspective view of the service cover overlooking the in-use inner surface;

9 the Ölabscheide- and reprocessing housing in a sectional view;

10 the section according to the line XX in 2 ,

Description of the embodiments

Shown and described, first with reference to 1 , an oil lubricated rotary vane vacuum pump 1 with a rotary valve unit and an oil separation and reprocessing device 3 ,

The rotary valve unit 2 has an aggregate housing, in which a rotary valve space 5 with a rotary valve rotor 6 are arranged. The unit housing is from a hood 4 and by with respect to a longitudinal axis respectively end side covers arranged 11 and 12 covered.

The rotary valve room 5 is formed in the manner of a cylindrical bore in the unit housing. The rotary valve room 5 has a longitudinal extent, which is located at the bore axis of the rotary valve chamber 5 oriented.

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

The rotary valve rotor 6 has several, in the embodiment three slides 7 on. These are in cross-section approximately radially aligned slots 8th of the rotor 6 slidably arranged. The sliders 7 be by the rotation of the rotary valve rotor 6 According to centrifugal force against the rotary valve chamber 5 pressed down limiting wall.

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

The rotary valve room 5 is with respect to its longitudinal axis each end closed by rotary valve side cover 46 and 47 (see. 10 ).

Outside the unit housing, for example, assigned to the side cover 12 , is the electric motor 9 preferably attached to the unit housing. The shaft of the rotary valve rotor 6 can be used for non-rotatable attack of the electric motor 9 the relevant side cover 12 push through.

About the resizing of the chambers 10 during operation of the vacuum pump 1 arise 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 may be arranged directly on the rotor shaft or, as further preferred, via a coupling.

Oil-lubricated rotary valve aggregates 2 are characterized by the fact that with this oil in the rotary valve chamber 5 is initiated. This oil causes gaps between the various components, especially between the slides 7 and the wall of the rotary valve chamber 5 added. This is how the gas exchange between the different chambers 10 with special needs. 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 the rotary valve unit 2 sponsored 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 the rotary valve unit 2 has left, needs to be recycled. The oil separation and reprocessing facility serves this purpose 3 ,

The device 3 is with the rotary valve unit 2 connected, so that a unit is formed, consisting of rotary valve unit 2 , Oil Separator and Remanufacturer 3 and electric motor 9 ,

The oil separation and reprocessing facility 3 initially has a Ölabscheide- and reprocessing housing 13 on, with side walls 14 . 15 , a bottom wall 16 a ceiling wall 17 and end walls 18 . 19 ,

The end walls 18 and 19 are in the longitudinal extension of the housing 13 considers which longitudinal extent of the longitudinal extent of the rotary valve space 5 the rotary valve unit 2 corresponds, each end of the side walls 14 and 15 , the bottom wall 16 and the ceiling wall 17 arranged integrally molding housing, in particular screw-connected to the housing. The front wall 18 is preferred by a service cover and the end wall 19 formed by a rear side cover.

The housing 13 can with respect to its longitudinal extent of an extruded profile 20 . in particular consist of an aluminum extruded profile. So has the oil separation and recycling housing 13 over the length of 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 visually uniform and clean designed 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 manufacture of the housing 13 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 finally represents the design-giving element.

The side walls 14 and 15 extend transversely to a plane of rotation of the rotary valve rotor 6 , wherein in the illustrated embodiment, the side wall 14 at the same time the mounting plane for mounting the Ölabscheide- and reprocessing housing 13 represents on the unit housing.

The end wall arranged end 18 closes in a possible embodiment outside the wall with the adjacent side cover 11 as well as further preferred the ceiling wall 17 and the bottom wall 16 with the adjoining adjacent wall sections of the unit housing. This results in a compact and visually appealing unit.

The rotary valve unit 2 facing away and thus outwardly facing outer surface of the side wall 15 is with respect to a cross section in the plane of rotation of the rotary valve rotor 6 corrugated formed (see, in particular 9 ). This results from the extension length of the side wall, which is considered in cross-section 15 even, rounded elevations connected by valleys. As a result, an enlargement of the surface in the region of the side wall 15 achieved and thus improve the heat dissipation during operation of the vacuum pump 1 ,

The shaft surface continues in a preferred embodiment in the facing surface areas of the end walls 18 and 19 ,

The oil separation and recycling housing 13 has a preferably integrally formed chambering. With respect to a state of erection as shown also arise with respect to gravity, a lower chamber 21 and an upper chamber 22 , The separation of the chambers 21 and 22 is achieved by a with respect to a cross-section according to 9 across the side walls 14 and 15 extending divider 23 ,

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

For this purpose, first a gravity and / or impact separator 24 and a downstream in the gas flow direction, two-stage separator provided, which consists of a first separator T ₁ in the form of a Feinabscheideeinrichtung 25 and a downstream second separator T ₂ in the form of Nachabscheideeinrichtung 43 composed.

The oil / gas mixture exits the rotary valve unit 2 via a passage opening 26 in the area of the side wall 14 into the oil separation and reprocessing facility 3 one.

With entrance to the facility 3 Preferably, a coarse separation of large drops of oil by the gravity and / or impact separator is preferably carried out 24 due to redirection of the gas-oil mixture and slowing down the flow.

The entry of the oil-gas mixture into the device 3 takes place according to the appropriate arrangement of the passage opening 26 in the area of the lower chamber 21 in which according to a separator T ₃ , for example in the form of a gravity and / or impact separator 24 , can be arranged.

Located below the passage opening 26 in the area of the lower chamber 21 resulting housing section 27 serves as an oil sump in which an oil sump collects. It's like that in the lower chamber 21 an oil reservoir formed.

Next forms the lower chamber 21 a flow path having a flow oriented at the longitudinal orientation of the housing a. This flow a is in the direction of the rear end wall 19 directed.

In order to avoid a fluidization of the collecting oil in the oil sump by the gas flow, the area of the oil pan is covered by a retracted filter plate 44 ,

The wall inside of the front wall 19 is designed to deflect the flow from the lower chamber 21 in the upper chamber 22 in which the one in the upper chamber 22 formed flow path a flow b opposite to the flow a of the lower chamber 21 allows.

In the upper chamber 22 the separators T ₁ and T _{2 are provided} in a linear series arrangement.

The fine separator 25 (Separator T ₁ ) has a tubular filter mat 42 on, whose tube axis is preferably rectified to the rotor axis x of the rotary valve rotor 6 , So is the Feinabscheideeinrichtung 25 essentially in the longitudinal direction of the oil separation and recycling housing 13 oriented arranged.

In the gas flow direction b downstream of the Feinabscheideeinrichtung 25 is in the upper chamber 22 a Nachabscheideeinrichtung 43 intended. The from the Feinabscheideeinrichtung 25 escaping gas is inevitably passed through the Nachabscheideeinrichtung 43 guided. The length c of the gas path between the first in the gas flow direction b separator T ₁ (Feinabscheideeinrichtung 25 ) and in the gas flow direction b second separator T ₂ (Nachabscheideeinrichtung 43 ) corresponds to about one quarter to one third of the diameter of the first separator T ₁ (based on the largest cross-sectional extension dimension of the filter element effective).

That from the lower chamber 21 in the upper chamber 22 Diverted oil-gas mixture is selectively and successively passed through the two separators T ₁ and T ₂ , wherein before the first separator T ₁ and behind the second separator T _2, a pressure difference results, depending on the delivery pressure of the rotary valve unit 2 can be up to 400 mbar.

Further, in the oil separation and reprocessing facility 3 an oil foam decomposing device may be provided.

There is also an oil filter 28 intended. This may be the bottom portion of the oil separation and reconditioning housing 13 , more preferably, the rear end wall 19 be arranged assigned. Through the oil filter 28 the oil in the oil sump is sucked and freed in particular of solid particles.

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

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 in the area of the lower chamber 21 intended.

Also, 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 ), Cooling paths may be provided.

The in the state of use preferably an operator facing end wall 18 inside the wall leaves a passage for connecting the upper chamber 22 with the lower chamber 21 , Which passage is formed by a float device 30 , Oil deposited on the two separators T ₁ and T ₂ is returned to the reservoir in the area of the lower chamber 21 passed through the floatation device 30 , This prevents according to the above-described pressure difference in front of and behind the separating means T ₁ and T _2, a short-circuit-like currents of the through the passage opening 26 into the lower chamber 21 entering gas directly to the gas outlet 31 ,

In addition, an oil bath heater may be provided to the oil before the start of the vacuum pump 1 to warm up.

In addition, an additional water cooling can be provided.

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

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

In the maintenance cover 33 is the gas outlet 31 intended. For this purpose, the maintenance cover 33 a passage opening 34 on, on which outside of the maintenance cover 33 a gas outlet 35 can connect.

The gas outlet nozzle 35 can be in the form of a removable deflector cap 36 be formed, 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 up to 90 ° down towards the through the bottom wall 16 given level is deflected. As a result, the sound is directed towards the ground, resulting in a reduction of noise pollution.

Preference is given to the gas outlet nozzle 35 rotatable on the maintenance cover 33 arranged so that the exhaust air can optionally be deflected, for example, to the side or upwards.

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

In addition, a maintenance cover 33 with deflection cap 36 against a maintenance cover 33 be exchanged for connection, for example, an external piping.

The oil separation and reprocessing facility 3 has several monitoring and / or maintenance facilities 37 , So can in the front wall 18 , assigned to the lower chamber 21 , a level indicator 38 be provided for determining 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 found in the area of the end wall 18 be arranged.

Next can in the front wall 18 both the inlet and the outlet for changing the oil in the Ölabscheide- and reprocessing device 3 be provided. These are in one embodiment in the end wall 18 an oil outlet opening 39 and a filler neck 40 intended.

After removal of the front wall 18 associated maintenance cover 33 Both separators T ₁ and T ₂ and the float device 30 for maintenance and, if necessary, replacement of the operating side of the vacuum pump 1 accessible.

So lies after removal of the front wall 18 first, the second separator T ₂ (Nachabscheideeinrichtung 43 ) free. This can be done from the upper chamber 22 be taken out. The Nachabscheideeinrichtung 43 can in this case, for example, on a carriage-like frame 45 be attached. The Nachabscheideeinrichtung 43 can in one embodiment together with the frame 45 from the upper chamber 22 are removed, after which the filter mat 42 the Feinabscheideeinrichtung 25 also exposed for removal or on the filter mat 42 can be accessed for maintenance purposes.

The gas path between the two separators T ₁ and T ₂ is formed valve-free and, in the illustrated embodiment, with respect to a cross-section alone surrounded by the material of the Ölabscheide- and reprocessing housing 13 in the area of the upper chamber 22 ,

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

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

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 as cover parts A, B and C the Ölabscheide- and reprocessing housing 31 directly or indirectly (cover part C or maintenance cover 33 ).

According to the above-described arrangement of the monitoring and / or maintenance facilities 37 as well as the design of the cover parts A, B and C are preferably all relevant to the operator interfaces conveniently accessible in the end walls 18 . 19 accommodated, which reduces the space required for the device, the ease of maintenance increases and the manufacturability of Ölabscheide- and reprocessing housing is simplified.

The above explanations serve to explain the inventions as a whole, which further develop the state of the art independently, at least by the following feature combinations, namely:
A rotary vane vacuum pump 1 characterized in that the gas is successively disposed within the oil separation and recycling housing 13 two separators T ₁ , T ₂ flows through, both of an end wall 18 are accessible for maintenance.

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

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

A rotary vane vacuum pump 1 , which is characterized in that a gas path between the first in the gas flow direction b separator T ₁ and in the gas flow direction b second separator T ₂ is formed without a valve.

An oil lubricated rotary vane vacuum pump 1 , characterized in that the length c of the gas path between the first separator T ₁ in the air flow direction b and the second separator T _{2 in the} second air flow direction b corresponds to a diameter dimension or less of the first separator T ₁ .

LIST OF REFERENCE NUMBERS

1

vacuum pump

2

Rotary vane assembly

3

Oil separation and reprocessing device

4

Hood

5

Vane space

6

Rotary vane rotor

7

pusher

8th

slot

9

electric motor

10

chamber

11

side cover

12

side cover

13

Oil Separator and Reprocessing Housing

14

Side wall

15

Side wall

16

bottom wall

17

ceiling wall

18

bulkhead

19

bulkhead

20

Extruded

21

lower chamber

22

upper chamber

23

divider

24

Gravity and / or impact separator

25

fine separation

26

Through opening

27

housing section

28

oil filter

29

suction

30

float device

31

gas outlet

32

opening

33

maintenance cover

34

Through opening

35

Gas outlet nozzle

36

deflecting

37

Monitoring and maintenance device

38

level indicator

39

drain hole

40

filler pipe

42

filter mat

43

Nachabscheideeinrichtung

44

filter sheet

45

frame

46

Rotary vane-side cover

47

Rotary vane-side cover

a

flow

b

flow

c

length

x

rotor axis

A

cover part

B

cover part

C

cover part

T ₁

separator

T ₂

separator

T ₃

separator

Claims (6)

Oil lubricated rotary vane vacuum pump ( 1 ) with a rotary valve unit ( 2 ), comprising a rotary valve chamber ( 5 ) and a rotary valve rotor ( 6 ), and with an oil separation and reprocessing device ( 3 ), wherein in the oil separation and reprocessing facility ( 3 ) a separation of oil and gas that the rotary valve aggregate ( 2 ) has passed through a separating device (T ₁ , T ₂ ), which preferably by a filter element and / or by a gravity and / or impact separator ( 24 ) and / or a fine separator ( 25 ), preferably together with an oil foam removal device, and / or with an oil cooler and / or with an oil pump, wherein for said devices one or more monitoring and / or maintenance device 37 provided and the oil separation and reprocessing facility ( 3 ) in an oil separation and recycling housing ( 13 ), with side walls ( 14 . 15 ), a bottom wall ( 16 ), a ceiling wall ( 17 ) and end walls ( 18 . 19 ), whereby the side walls ( 14 . 15 ) transverse to a plane of rotation of the rotary valve rotor ( 6 ) and a longitudinal extent of the Ölabscheide- and reprocessing housing ( 13 ), characterized in that the gas successively within the Ölabscheide- and reprocessing housing ( 13 ) passes through two separating devices (T ₁ , T ₂ ), both of which are separated by an end wall ( 18 ) are accessible for maintenance. Rotary vane vacuum pump according to claim 1, characterized in that both separating devices (T ₁ , T ₂ ) are individually used and removable. Rotary vane vacuum pump according to one of the preceding claims, characterized in that both separating devices (T ₁ , T ₂ ) combined for joint insertion and removal are connected to each other. Rotary vane vacuum pump according to one of the preceding claims, characterized in that a gas path between the first in the gas flow direction (b) separator (T ₁ ) and in the gas flow direction (b) second separator (T ₂ ) is formed 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 in the air flow direction (b) first separator (T ₁ ) and the second separator (T ₂ ) in the air flow direction (b) corresponds to a diameter measure or less of the first separator (T ₁ ). Rotary vane vacuum pump according to one of the preceding claims, characterized in that a further separating device (T ₃ ), for example in the form of a gravity and / or impact separator ( 24 ), is provided.

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