DE8402912U1 - Vane vacuum pump - Google Patents

Description

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Vane vacuum pump

The invention relates to a vane vacuum pump such as they are used in motor vehicles, in particular in diesel vehicles and gasoline vehicles with fuel injection for boosting the braking force and operating other Servo drives are used.

In a known pump, the lubricating oil is supplied by the oil pump of the motor vehicle engine through a trunk which is guided into the hollow shaft on which the rotor of the vane vacuum pump is mounted (Bag. 1O20 = US Pat. No. 4,255,098).

This construction requires that the vane vacuum pump is flanged to the motor housing of the motor vehicle, so that the draining oil can run back into the crankshaft space of the motor vehicle engine3.

Such a construction is not always possible or desirable for reasons of space. The object of the invention is Therefore, to create a vane vacuum pump that is self-sufficient in terms of oil lubrication and designed as a unit, in which the exhaust air is oil-free so that it can be led outside and in the one with regard to lubrication maintenance-free operation is ensured over long periods of time. It is still solved the task that the oil removal the exhaust air takes place without pressure by means of the per se known de-oiling filter, which avoids loss of performance will. This eliminates the disadvantage of the known oil removal filters, which have such a high throttle resistance have that a sufficient air throughput can only be achieved with a correspondingly high pressure difference is overcome.

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The invention according to claim 1 is characterized in that the guidance of the exhaust air releases pressure and without throttling losses is possible. The exhaust air duct allows a compact design. It can be sufficiently thick and dense De-oiling filters can be used without pressure losses occur or without a high pressure difference required to achieve a sufficient air throughput wSfe. Vacuum pump and de-oiling device are under low technical effort integrated into a low-maintenance unit. The vacuum pump can be placed anywhere without Lubrication attached from the outside, e.g. to another auxiliary unit like e.g. the alternator can be flanged on.

The following is an example of execution based on the drawing * 5 description.

The hollow shaft 2 is rotatably mounted in the housing 1 (slide bearing 30, 31) and driven by V-belt pulley 3. The rotor 4 with vanes sits non-rotatably on the hollow shaft 2 5, which are guided in a known manner in slots of the rotor and form vane cells on the circumference of the rotor. The air inlet is labeled 6. Through the pins 7 the effect is that the wings 5 cannot get stuck in the bottom dead center positions. They have play with each other, like that

2i> that they only cause a forced extension movement, if this is opposed by a resistance.

The rotating oil separator is also on the hollow shaft 2 8 stored in the oil collecting chamber 9. Dei: oil separator consists of two disks 10 and 11, which are non-rotatably connected to the hollow shaft 2 and the rotating oil filter 12 and the air filter 13 take up between them. With and 15 support screens are referred to, which have a sufficient Have strength to absorb the centrifugal forces exerted on the rotating oil filter or air filter. In the inner annular space 16 of the rotating oil removal

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filt.ers opens through radial duct 17 of the air outlet 18 of the vacuum pump, which through annular duct 19 and radial branch ducts 20 is connected to the axial channel 21 of the hollow shaft. The exiting air is therefore in the oil separator S exposed to centrifugal action, so that it passes through the rotating de-oiling and air filters into the separation chamber 9 arrives.

In the oil separator this is in the air flow as an aerosol Suspended ul coagulated and excreted in large drops. These drops are hurled against the outer walls of the separation chamber 9 and drip into the oil sump 23 from. The oil-free air is discharged into the open through a bag filter 24 and outlet 25.

The oil requirement of the pump is met from the oil sump 23. For this purpose, an oil suction channel 28 is provided which opens into the wing root spaces. The wing foot spaces 29 are available when extend the wings, under a negative pressure, so that through the oil suction channel 28 oil from the sump into the respective Wing foot space 29 is sucked in. The connection between the oil suction duct 28 and the wing foot space 29 can be through a disc-shaped recess 32 of the rotor take place, so that a continuous flow of oil is created. For dosage can alternatively, the oil suction channel 28 can be connected to the wing foot space 29 via a longitudinal groove according to the chopper principle, which creates a discontinuous, speed-dependent oil flow. It is also possible to use the To accomplish bearing play.

In addition, a relief channel 26 between the oil sump and the outer seal 27 opposite the hollow shaft the housing should be provided to prevent any Oil coming under overpressure loads the seal 27 and exits.

It · t

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REFERENCE SIGNS LISTING

1 housing

2 hollow shaft

3 V-belt pulley

4 rotor 3 blades

6 air inlet

7 pens

8 oil separators

9 oil collecting canisters

10 disc

11 disc

12 oil filter

13 air filter

14 support sieve

15 support sieve

16 annulus

17 radial channel

18 air outlet

19 ring channel

20 branch channel

21 axial channel

22 ring channel

23 oil sump

24 eye filters

25 outlet

26 discharge channel

27 outer seal

28 Oil intake duct

29 Wing root space

30 plain bearings

31 plain bearings

32 disc-shaped recess

Claims (7)

barmag Banner MaschinenjEapr.ik * 2 & t ^ e, nges; el £ LTsp Headquarters RemscTieid, Federal Republic of Germany 0-1379 - 1 - Claims 1. Vane vacuum pump with a rotor mounted on a hollow shaft with vane slots and vanes movable in the radial direction therein
as well as with an oil collecting kairaner, in which there is an oil sump, from which the lubricating oil requirement of the vacuum pump is covered and into which the excess lubricating oil is discharged, characterized in that
the Piunpen outlet leads through an annular channel into the hollow shaft, that the hollow shaft in the oil collecting chamber opens into a rotating oil separator which is connected to the hollow shaft in a rotationally fixed manner,
that the rotating oil separator consists of hollow cylindrical oil separators, that the oil collecting chamber is provided with an outlet opening to the outside, and that the oil sump is on the front side via a suction line opens out on the turning circle of the wing root spaces in the area of the extending wing. 2. Pump according to claim 1,
characterized in that the oil separator is non-rotatably connected to the hollow shaft is and consists of hollow cylindrical de-oiling filters that are radially removed from the exhaust air leaving the hollow shaft are flowed through. 30th 0-1379 - 2 - 3. Pump according to claim 2, characterized in that the oil separator is designed as a drum, one end face of which sits on the free end of the hollow shaft and closes it, the end faces receiving hollow cylindrical oil filters and / or air filters, each forming an annular space to the hollow shaft or between the oil filter and air filter. 4. Pump according to claim 2 or 3, i characterized in that '' the oil filter and / or air filter through cylinder jacket-shaped support plates are supported. '< 15 5. Pump according to one of the preceding claims, characterized in that the outlet of the oil collecting chamber to the outside through a; Post-filter is closed. (f 20 6. Pump according to one of the preceding claims, · " Characterized in that the wings by a forced operation, in particular by with play, pushing pins are moved outwards will.
25th 7. Pump according to one of the preceding claims, characterized by a relief channel that connects the front seals of the housing with the oil collecting chamber \ 30 • * I Il Il I • * * I 1 · I I • «ti *» I f ((I