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

Abstract

An oil-lubricated slide vane rotary vacuum pump with a slide vane unit, and with an oil separating and reconditioning device, wherein oil and gas are separated by separating devices, possibly complemented by oil coolers and/or oil pumps. One or more monitoring and/or servicing devices are provided, and the oil separating and reconditioning device is installed in an oil separating and reconditioning housing. Side walls extend transversely to a plane of rotation of a slide vane rotor, and define a longitudinal extent of the oil separating and reconditioning housing. The one or more monitoring and/or servicing devices are arranged only in one or more cover parts which are attached to one or both end walls of the oil separating and reconditioning housing. The oil separating and reconditioning housing is formed with the side walls, the bottom wall and the top wall without being configured for a monitoring and/or servicing device.

Claims

1. An oil-lubricated slide vane rotary vacuum pump (1) with a rotary slide vane aggregate (2), comprised of a rotary slide vane chamber (5) and a rotary slide vane rotor (6), and with an oil separating and reconditioning device (3), wherein oil and gas are separated in the oil separating and reconditioning device (3) by means of one or more monitoring or servicing devices (37), and the oil separating and reconditioning device (3) is accommodated in an oil separating and reconditioning housing (13), with side walls (14, 15), a floor wall (16), a ceiling wall (17) and end walls (18, 19), wherein the side walls (14, 15) extend transverse to a rotational plane of the rotary slide vane rotor (6), and define a longitudinal extension of the oil separating and reconditioning housing (13), wherein, in terms of its longitudinal extension, the oil separating and reconditioning housing (13) comprises an aluminum extruded profile, and has an integrally designed chamber system, with a lower chamber (21) and upper (22) chamber in an installation state with respect to gravity.

2. The slide vane rotary vacuum pump according to claim 1, wherein the one or more monitoring or servicing devices (37) are arranged only in one or several cover parts (A, B, C), which are secured to one or both end walls (18, 19) of the oil separating and reconditioning housing (13), and wherein the oil separating and reconditioning housing (13) otherwise comprises the side walls (14, 15), floor wall (16) and ceiling wall (17) without a configuration for the one or more monitoring or servicing device (37).

3. The slide vane rotary vacuum pump according to claim 2, wherein a fine separating device (25) is provided, and wherein a filter mat (42) is provided in the fine separating device (25).

4. The slide vane rotary vacuum pump according claim 1, wherein the one or more monitoring or servicing devices (37) are arranged on one removable maintenance cover (33) of the oil separating and reconditioning device (3), wherein a fine separating device (25).sub.7 is provided and is configured to be accessed for maintenance after removing the maintenance cover (33).

5. The slide vane rotary vacuum pump according claim 4, wherein the maintenance cover (33) forms part of one of the end walls (18, 19) of the oil separating and reconditioning housing (13), or forms one of the end walls (18, 19) as a whole.

6. The slide vane rotary vacuum pump according to claim 4, wherein the fine separating device (25) that is configured to carry a flow and is arranged in the longitudinal direction of the oil separating and reconditioning device (3) in terms of a direction of flow (b).

7. The slide vane rotary vacuum pump according to claim 4, wherein the fine separating device (25) is has a floater unit (30), and wherein oil separated in the fine separating device (25) flows into the housing section (27) by way of the floater unit (30).

8. The slide vane rotary vacuum pump according to claim 4, wherein a fill level indicator (38) is provided on one of the end walls (18, 19).sub.7 or in the maintenance cover (33), or a relief valve or bursting disk (41) is arranged in one of the end walls (18, 19) or in the maintenance cover (33), or a temperature monitoring element is arranged in one of the end walls (18, 19), or in the maintenance cover (33), or one of the end walls or maintenance cover is configured so that gas conveyed through one of the end walls (18, 19) or through the maintenance cover (33) exits, or the maintenance cover (33) has a gas outlet nozzle (35).

9. The slide vane rotary vacuum pump according to claim 8, wherein the maintenance cover has the gas outlet nozzle (35) and the gas outlet nozzle is provided with a removable deflection cap (36), in which the exiting gas is deflected by at least 60 relative to its outlet direction at the gas outlet nozzle (35).

10. The slide vane rotary vacuum pump according to claim 4, wherein the fine separating device (25) is arranged in the upper chamber (22), wherein the fine separating device (25) has a fine separator realized by a filter element, or oil and gas are separated by an oil foam degrading device.

11. The slide vane rotary vacuum pump according to claim 1, wherein the lower chamber (21) comprises an oil collecting tank.

12. The slide vane rotary vacuum pump according to claim 11, wherein one or several cooling lines integrated into the extruded profile (20) are provided, and allocated to the oil collecting tank.

13. The slide vane rotary vacuum pump according to claim 1, wherein a one of the side walls (14, 15) has a passage opening (26) between the rotary slide vane aggregate (2) and the oil separating and reconditioning device (3), the passage opening being configured for allowing compressed gas with an oil portion to enter into the oil separating and reconditioning device (3), wherein the passage opening (26) empties into the lower chamber (21).

14. The slide vane rotary vacuum pump according to claim 13, wherein a housing section (27) is formed underneath the passage opening (26) as an adjoining flow path, into which oil separated from the gas enters through exposure to gravity or centrifugal force, or the housing section (27) has an oil outlet opening (39) that is configured to be accessed from one of the end walls (18, 19) of the oil separating and reconditioning housing (13) and further comprising an oil filter (28) that is configured such that the oil located in the housing section (27) is guided through the oil filter (28).

15. The slide vane rotary vacuum pump according to claim 14, wherein the rotary slide vane chamber (5) is configured such that the oil guided through the oil filter (28) is introduced into the rotary slide vane chamber (5).

16. The slide vane rotary vacuum pump according to claim 1, wherein the slide vane rotary pump is configured such that gas enters into the slide vane rotary vacuum pump, and the entering gas with oil portion flows in a first section of the oil separating and reconditioning device (3) in a countercurrent (a) to a second section, in which fine separation takes place.

17. The slide vane rotary vacuum pump according to claim 1, wherein one of the end walls (18) has a maintenance cover (33) with a gas outlet nozzle (35) or a maintenance cover (33) that is configured for connecting a silencer or a continuation element.

18. The slide vane rotary vacuum pump according to claim 1, wherein at least one of the end walls (18, 19) comprises a connection between the chambers (21, 22).

19. The slide vane rotary vacuum pump according to claim 1, wherein oil and gas are separated by a filter element or oil and gas are separated by a gravity or impact separator.

20. The slide vane rotary vacuum pump according to claim 1, wherein at least one of an oil cooler and an oil pump is provided.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail below based on the attached drawing, which only describes an exemplary embodiment. Shown on:

(2) FIG. 1 is a perspective view of an oil-lubricated slide vane rotary vacuum pump;

(3) FIG. 2 is a top view thereof;

(4) FIG. 3 is a side view of the vacuum pump, with focus on a side wall with a maintenance cover;

(5) FIG. 4A is the section according to line IV-IV on FIG. 3;

(6) FIG. 4B is the section shown in FIG. 4A in which the deflection cap 36 has been replaced and the cap outlet connects with the silencer 44;

(7) FIG. 5 is the section according to line V-V on FIG. 2;

(8) FIG. 6 is an outward magnification of the VI area on FIG. 4B;

(9) FIG. 7 is a perspective view of the vacuum pump after removing an end wall and an oil separating and reconditioning housing;

(10) FIG. 8 is a perspective, individual view of the oil separating and reconditioning housing;

(11) FIG. 9 is a perspective, individual view of the side wall removed on FIG. 7 with allocated maintenance cover and a gas outlet nozzle that can be secured to the maintenance cover;

(12) FIG. 10 is another perspective view of the maintenance cover, with focus on the inner surface in the use state;

(13) FIG. 11 is a sectional view of the oil separating and reconditioning housing.

DESCRIPTION OF THE EMBODIMENTS

(14) Shown and described initially with reference to FIG. 1 is an oil-lubricated slide vane rotary vacuum pump 1 with a rotary slide vane aggregate and an oil separating and reconditioning device 3.

(15) The rotary slide vane aggregate 2 has an aggregate housing, which incorporates a rotary slide vane chamber 5 with a rotary slide vane rotor 6, and is covered by a hood 4.

(16) The rotary slide vane chamber 5 takes the form of a cylindrical borehole in the aggregate housing. The rotary slide vane chamber 5 has a longitudinal extension oriented to the borehole axis of the rotary slide vane chamber 5.

(17) The cylindrical rotary slide vane rotor 6 is eccentrically arranged relative to the rotary slide vane chamber 5. Correspondingly, the rotor axis x runs parallel but offset to the spatial axis.

(18) The rotary slide vane rotor 6 has several slide vanes 7, three in the exemplary embodiment. In cross section, the latter are slidably arranged in slots 8 of the rotor 6, which are roughly radially oriented. The slide vanes 7 are pressed against the wall bordering the rotary slide vane chamber 5 by the rotation of the rotary slide vane rotor 6.

(19) With the vacuum pump 1 in operation, the rotary slide vane rotor 6 rotates radially offset to the central axis of the rotary slide vane chamber 5 as the result of being driven by a motor that rotationally acts on the rotor shaft, in particular an electric motor 9. Separated by the radially displaceably arranged slide vanes 7, this yields closed chambers 10, whose size changes as the rotary slide vane rotor 6 rotates.

(20) In relation to its longitudinal axis, the rotary slide vane chamber 5 is closed at its respective end by an air guiding hood 11 and a motor flange 12, which can provide a mount for the rotary slide vane rotor 6.

(21) Outside of the aggregate housing, for example allocated to the motor flange 12, the electric motor 9 is preferably fastened to the aggregate housing. The shaft of the rotary slide vane rotor 6 can penetrate through the corresponding motor flange for the non-rotational engagement of the electric motor 9.

(22) The change in size of the chambers 10 with the vacuum pump 1 in operation results in pressure differences between the individual chambers 10, and hence between the inlet side and outlet side of the blower formed in this way.

(23) The drive via the electric motor 9 can be arranged directly on the rotor shaft or, as further preferred, by way of a coupling.

(24) Oil-lubricated rotary slide vane aggregates 2 are now characterized by the fact that, in the latter, oil is introduced into the rotary slide vane chamber 5. This oil closes gaps between the different components, in particular between the slide vanes 7 and the wall of the rotary slide vane chamber 5. This impedes gas exchange between the different chambers 10. In this way, higher vacuums are achieved during operation than possible for dry running slide vane rotary pumps.

(25) The type of construction causes the oil to be conveyed out of the last chamber 10 of the rotary slide vane aggregate 2 along with the conveyed gas. Due to the compression enthalpy in the system, the oil is also heated. Since the oil comes into contact with the conveyed medium (gas), it can become contaminated or change owing to potential chemical reactions.

(26) The oil cycles through the vacuum pump 1. As a result, it must be prepared after leaving the rotary slide vane aggregate 2. The oil separating and reconditioning device 3 is used for this purpose.

(27) The device 3 is connected with the rotary slide vane aggregate 2, thereby yielding a unit comprised of the rotary slide vane aggregate, oil separating and reconditioning device 3 and electric motor 9.

(28) The oil separating and reconditioning device 3 initially has an oil separating and reconditioning housing 13, with side walls 14, 15, a floor wall 16, a ceiling wall 17 and floater units 18, 19.

(29) The side walls 18 and 19 are viewed in the longitudinal extension of the housing 13, wherein said longitudinal extension corresponds to the longitudinal extension of the rotary slide vane chamber 5 of the rotary slide vane aggregate 2, respectively arranged at the end side of the housing integrally forming the side walls 14 and 15, floor wall 16 and ceiling wall 17, in particular connected with the housing by a screw. The end wall 18 is preferably formed by a service cover, and the end wall 19 by a rear side cover.

(30) In terms of its longitudinal extension, the housing 13 can consist of an extruded profile 20, in particular of an aluminum extruded profile. The oil separating and reconditioning housing 13 has an essentially constant cross section over its length, while maintaining a dimensionally stable contour as viewed over the longitudinal extension. In addition, the outer surfaces are optically uniform and clean in design when manufacturing the housing 13 in the extrusion process, obviating the need for surface treatment steps to optically upgrade the surface. Only necessary processing steps can be provided, for example perforations in the side walls and/or floor wall and/or ceiling wall.

(31) The housing 13 can also be manufactured in the extrusion process in such a way that, apart from the surface, the shape of the housing can be designed so that the latter ultimately represents the design-creating element.

(32) The side walls 14 and 15 extend transverse to a rotational plane of the rotary slide vane rotor 6, wherein the side wall 14 in the exemplary embodiment shown simultaneously represents the fastening plane for fastening the oil separating and reconditioning housing 13 to the aggregate housing.

(33) In a possible embodiment, the side walls 18 and 19 arranged at the respective end side terminate with the adjacent air guiding hood 11 and motor flange 12, as further preferably do the cover wall 17 and floor wall 16 with the adjacent wall sections of the aggregate housing that follow the latter. This yields a compact and visually appealing unit.

(34) The outer surface of the side wall 15 that faces away from the rotary slide vane aggregate 2, and thus faces toward the outside, has an undulating design with respect to a cross section in the rotational plane of the rotary slide vane rotor 6 (see in particular FIG. 11). Uniform, rounded elevations arise over the extension length of the side wall 15 viewed in cross section, and are connected with each other by valleys. This enlarges the surface in the area of the side wall 15, and thus improves heat dissipation with the vacuum pump 1 in operation.

(35) In a preferred embodiment, the shaft surface continues in the facing surface areas of the end walls 18 and 19.

(36) The oil separating and reconditioning housing 13 has a preferably integrally designed chamber. In reference to an installation state as already shown, a lower chamber 21 and an upper chamber 22 arise with respect to gravity. The chambers 21 and 22 are separated by a separating web 23 that runs transverse to the side walls 14 and 15 with respect to a cross section according to FIG. 11.

(37) With the vacuum pump 1 in operation, in particular a separation of oil and gas takes place in the oil separating and reconditioning device.

(38) Provided to this end is a gravity and/or impact separator 24 and a separating device 25, e.g., the fine separating device, as well as a filter element 45, an oil cooler 47 and a pump 48.

(39) The oil/gas mixture exits the rotary slide vane aggregate 2 through a passage opening 26 in the area of the side wall 14 and enters into the oil separating and reconditioning device 3.

(40) During entry into the device 3, large oil drops are preferably first coarsely separated using the gravity and/or impact separator 24 by diverting the gas-oil mixture and slowing the flow.

(41) The oil-gas mixture enters into the device 3 by correspondingly arranging the passage opening 26 in the area of the lower chamber 21, in which the gravity and/or impact separator 24 is correspondingly arranged.

(42) The housing section 27 arising under the passage opening 26 in the area of the lower chamber 21 serves as a kind of oil pan, in which an oil sump accumulates. In this way, an oil collecting tank is formed in the lower chamber 21.

(43) The lower chamber 21 further forms a flow path with a flow a oriented to the longitudinal alignment of the housing. This flow a is directed toward the rear end wall 19.

(44) The interior wall side 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 permits a flow b opposite to the flow a of the lower chamber 21.

(45) The separating device 25, e.g., the fine separating device, is arranged in the upper chamber 22.

(46) The separating device 25, e.g., the fine separating device, has a tubular filter mat 42, whose tubular axis is preferably co-directional relative to the rotor axis x of the rotary slide vane rotor 6. The separating device 25, e.g., the fine separating device, is further essentially oriented in the longitudinal direction of the oil separating and reconditioning housing 13.

(47) The oil-gas mixture diverted from the lower chamber 21 into the upper chamber 22 is guided through the separating device 25, e.g., the fine separating device, in a targeted manner, wherein a pressure difference arises in front and back of the separating device 25, e.g., the fine separating device, which can measure up to 400 mbar depending on the conveying pressure of the rotary slide vane aggregate 2.

(48) An oil foam degrading device 46 for separating oil and gas can further be provided in the oil separating and reconditioning device 3.

(49) An oil filter 28 is also provided. It can be allocated to the floor area of the oil separating and reconditioning housing 13, further preferably to the rear end wall 19. The oil in the oil sump is aspirated through the oil filter 28, and in particular freed of solid particles.

(50) The oil filtered in the oil filter 28 is conveyed into the rotary slide vane aggregate 2 via the suction line 29, utilizing the pressure difference between the lower chamber 21 and chamber 10 in the rotary slide vane aggregate 2.

(51) An external cooler (not shown) can be used to cool in particular the filtered oil. To this end, corresponding inlets and outlets are provided in the area of the lower chamber 21.

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

(53) The end wall 18 preferably facing an operator in the use state leaves a passageway on the interior side of the wall for connecting the upper chamber 22 with the lower chamber 21, wherein this passageway consists of a floater unit 30. Oil deposited on the separating device 25, e.g., the fine separating device, is routed back into the reservoir in the area of the lower chamber 21, specifically through the floater unit 30. As a result of the pressure difference described above in front and back of the separating device 25, e.g., the fine separating device, this prevents a short circuiting type of flow of the gas entering into the lower chamber 21 through the passage opening 26 directly to the gas outlet 31.

(54) In addition, an oil bath heater can be provided to heat the oil before starting the vacuum pump 1.

(55) An additional water cooler can also be provided.

(56) The oil bath heater and/or the water cooler can be arranged on the end wall 19.

(57) In the end wall 18 that faces away from the electric motor and during operation comprises a front side, a front A window-like opening 32 allocated to the upper chamber 22 and extending at least approximately over the entire cross sectional area of the upper chamber 22 is provided. The latter is closed by a maintenance cover 33 with the vacuum pump 1 in operation. The maintenance cover 33 can be screwed with the end wall 18, preferably with a gasket interspersed.

(58) The gas outlet 31 is provided in the maintenance cover 33. To this end, the maintenance cover 33 has a through opening 34, which is adjoined by a gas outlet nozzle 35 on the external wall side of the maintenance cover 33.

(59) The gas outlet nozzle 35 is designed as a removable deflection cap 36, in which the exiting gas, relative to its alignment present at the gas outlet nozzle, which is essentially co-directional to the flow b in the upper chamber, is downwardly deflected by at least 60, preferably by up to 90 toward the plane given by the floor wall 16. As a result, the sound is directed toward the floor, which helps to reduce noise.

(60) The gas outlet nozzle 35 is preferably rotatably arranged on the maintenance cover 33, so that the exhaust air can optionally also be laterally or upwardly diverted, for example.

(61) The deflection cap 36 can be replaced, for example with a gas outlet nozzle for connecting a silencer 44 or continuation element.

(62) In addition, a maintenance cover 33 with deflection cap 36 can be replaced with a maintenance cover 33 for connecting an external piping, for example.

(63) The oil separating and reconditioning device 3 has several monitoring and/or servicing devices 37. A fill level indicator 38 for determining oil quantity can be provided in the end wall 18 allocated to the lower chamber 21. Fill level indicator 38 can consist of an oil sight glass and/or an electrical oil level sensor.

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

(65) Furthermore, both the inlet and outlet for changing the oil in the oil separating and reconditioning device 3 can be provided in the end wall 18. In one embodiment, an oil outlet opening 39 and filler nozzle 40 are provided in the end wall 18.

(66) After the maintenance cover 33 allocated to the end wall 18 has been removed, the separating device 25, e.g., the fine separating device, and the floater unit 30 are accessible for maintenance and possible replacement from the operating side of the vacuum pump 1.

(67) In addition, a relief valve can be arranged in the maintenance cover 33.

(68) The relief valve serves as a safeguard against a sudden overpressure in the oil separating and reconditioning device 3; therefore, it is preferably part of the monitoring device.

(69) The end walls 18 and 19 along with the maintenance cover 33 are allocated directly or indirectly to the oil separating and reconditioning housing 31 as cover parts A, B and C (cover part C or maintenance cover 33).

(70) As a result of the above described arrangement of the monitoring and/or servicing devices 37 along with the configuration of the cover parts A, B and C, preferably all interfaces relevant to the operator are conveniently accessibly accommodated in the area of the end walls 18, 19, thereby reducing the space required for the device, increasing maintainability and making it easier to manufacture the oil separating and reconditioning housing. A temperature monitoring element 43 can be arranged in the end wall 18, 19, if necessary in the maintenance cover 33.

REFERENCE LIST

(71) 1 Vacuum pump 2 Rotary slide vane aggregate 3 Oil separating and reconditioning device 4 Hood 30 5 Rotary slide vane chamber 6 Rotary slide vane rotor 7 Slide vane 8 Slit 9 Electric motor 10 Chamber 11 Air guiding hood 12 Motor flange 13 Oil separating and reconditioning device 14 Side wall 15 Side wall 16 Floor wall 17 Ceiling wall 18 End wall 19 End wall 20 Extruded profile 21 Lower chamber 22 Upper chamber 23 Separating web 24 Gravity and/or impact separator 25 Separating device 26 Passage opening 27 Housing section 28 Oil filter 29 Suction line 30 Floater unit 31 Gas outlet 32 Opening 33 Maintenance cover 34 Passage opening 35 Gas outlet nozzle 36 Deflection cap 37 Monitoring and servicing device 38 Fill level indicator 39 Outlet opening 40 Filler nozzle 42 Filter mat a Flow b Flow x Rotor axis A Cover part B Cover part C Cover part