DE1628245A1 - Mechanical vacuum pump with air and oil supply - Google Patents

Description

PATENT LAWYERS

DR.-ING. H. FJNCKE DIPL.-iNG, H. BOH-R DIPL-ING. S. STAEGER

Telephone: 2249 41

8 MUNICH 5 Müllerstrasse 31

H & ppe 6723

B ea ο ag ell? u ag

sum application for patronage from

-Ιϊη »Et-ablissements BSMDOIXIJ,

"Mecbaniaoho Vakuumpiompe with Euf t- and Olsmf turning"

30. Jim! 1965 ~

Fraokreioli

Invention relates to maolianlsohe vacuum pumps, and in particular on devices for supplying air and oil with which these pumps are equipped

Belcanntlioh holds a meohaniaohe Talciiunipunipe

like a hollow space of variable volume, periodically with d «m

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009985/0550 ^ ^

Haum to be evacuated during one part of the working period in which the volume increases, is brewed in connection, then isolated, metm. the volume decreases? and that therefore the pressure hardly decreases and this is finally brought into connection with the environment or a cooling chamber as soon as the pressure has reached a certain value, and the volume then easily becomes hull,

Satsäohlloh, however, it is impossible to mechanically use a pump establish the volume of the variable space becomes completely Hull, or even a diminution of it To achieve a volume to a value that allows the generation of an increased vacuum «

These high vacuums are obtained by means of an oil spray device, which puts a small volume of oil into the tree variable volume is injected at a specific point in time of each working period, which means that the Lubrication is ensured

This introduction or injection can be particularly simple be made by the fact that the pressure difference between the environment and the vacuum prevailing in the pump exploited at the beginning of the compression phase, d ,, h. prmktieoh the Ifeuefc prevailing in the tree to be evacuated,

0 0 9 8 8 5/05 56 ^SAD

It is also necessary that the pump be set at St 111 the injected or introduced oil cannot flow back into the evacuating seam "

In order to achieve this in a single construction, there is, according to the invention, an intermediate storage device or in the rotor of the 2nd volume a single chamber of relatively large volume is provided as well Facilities that alternately connect these collectors with a main oil reservoir and with the interior of the pump

The volume of the chamber is fixed so that the gases and dissolved D vapors contained in the oil are sufficient even for cases that are particularly unfavorable to maintain the overpressure of the oil in relation to the pump interior without a sharp drop in pressure and during the entire dual injection process. You Sammer can advantageously be housed in the Eotorachse leg and consist of the facilities assigned to it from a Binsprltelcanal and an oil supply channel »die are recessed in the stator and in the bearing of the rotor opposite slots recessed in the axis of the rotor mouth »~

Experience shows that good results are obtained when

only the volume of the individual tolumen is greater than -.t-jC of the tolumen of the room with variable volume (if the latter is a maximum of 1st)

009885/0556 ORIGINAL BATHROOM

The injection channel is operated in such a way that the resistance ₍ which 63? Offers against the passage of oil) is sufficient "so that the chamber is not completely emptied during the injection" but gives off the volume necessary for the pump to work favorably.

Ita other white raan _s that gut when the pumps sucks a mixture of gas and steam, there is a risk "that the latter condenses during compression" which thus formed! Fluid can pass in oil in suspension, which caused a rapid renewal of the oil »

To avoid this condensation, people have been turning for a long time There was an artifice in the introduction of a non-condensable gas, usually τοη air, while working period exists in considerable quantities; being this $ 205 des Maximum volume euB of the variable cavity can reach

This introduction may only take place as soon as the pressure in the au evacuating tree below a threshold of 10 cm Quercksllbersäule has fallen because above this pressure the compression is insufficient to induce condensation is,

Care must also be taken that when the pump is shut down, the injected air is not in the au

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BATH ORIGINAL

evacuating tree / outer taking advantage of the inevitable Play between the moving ropes «.

This game is actually kept to a minimum such that the losses during each working period are negligible are »so they remain quite, substantial because the gases located at any point of the pump when it is shut down in the tree to be evacuated flow back.

Pure this. Air injection is therefore a return flow block, analog which is usually used in oil injection devices, required »

In addition, a cleaning device should be provided, the - after the non-return valve interrupted the air injection has - daa allowed evacuation of the air injected into the pump during the previous work periods.

An example embodiment of the invention is now intended explained in more detail on the basis of the accompanying drawings, iii whom _,

Fig. 1 is a view of a Meohattic vacuum pump according to ' dea? Invention is;

Fig. 2 is a rear view of the pump;

009885/0556 bad ORfQitMÄ

Pig. 3 let a cut along the line ΙΙΙ-Ι1Ϊ in Pig, 1, with the "seed injector closed;"

Fig. 4 is a line drawing, corresponding to Fig. 3 » wherein the air injection device tttttg is open;

Pig. 5 Is a section along the line V-T in fig. 1" the rotor being arranged in a position corresponding to the oil injection;

Pig 6 is a section along the line VI-YI in Pig 1, with the rotor in one of the air injection corresponding Position is.

In the described and illustrated embodiment, the vacuum pump according to the invention consists of the usual way a stator 10, the cylinder chamber 11 of which is formed by two planes 12 and 13 limited 1st, which form the bearings for the rotor 15 »The rotor, whose axis is eccentric to the axis of the chamber 11 lies, is cylindrical and stands with a surface line 16 of the stator in contact; it has two blades 17, which slide in two opposite radial shells 18 These blades are in contact with the walls of the comb door 11 rüokge st parts by springs, not shown, as well as by centrifugal force.

The rotor is in the axial direction with a very gaseous radial

009886/0556

Play over a stud 19 extended the feet with the Front flange 12 is connected via a shaft 20 feet, on the bands © ine roller 22 is attached * This is with a drive motor, not shown, via a friction-Semen 23 * connected *

In the chamber-It of the stator open an inlet channel 24, the that u "is intended to be connected to the room to be evacuated su be, as well as a. Svakuierong Canal 26, which is connected to a tared valve 2? is provided. The mouths of both channels are on either side of the touching dumbbell line 16 of the Stator Arranged with Your Rotor · The entire stator assembly is placed in an unillustrated container filled with oil, according to a widespread way of working, e Inge dives.

In the shaft 20 is a non-continuous axial bore introduced «whose rear rope 51 is smooth and whose front row. 32 has an internal thread with a larger Suroh knife has «A screwed into the thread and milliner Ring seal 54 provided AbsohluB 35 separates front and rear rope of the hole, the latter thus forming a closed cavity or hammer 36 * into this chamber two radial axils arranged opposite one another open 37 »which penetrate the wall of the shaft 20 and are easy to relate to

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der Schaufeleb © n @ are inclined * while in the wall of the Stutsens 19 surrounding this shaft a Isäsgstfräut 40 ₉ which is a recess in the Slansoh 12 Xeml 41 in connection with the chamber 11 and a downward Badialkanal 43 »with a line 44 with the oil reservoir in connection; Presnut 40 and channel 41 are arranged in this type of approximation in a ₉ through the rotor aohs © running horizontal plane on the side of the brewing channel 26 «

The slots 37 are operated so that they are opposite the £ anal 43 and the PrSsnut 40 during the rotor rotation the KompreeetöZLSphase su lie »

The arrangement formed from chamber 36, ₉ soles 37 »channels 41-4-5, forms an oil injection device, the mode of operation of which will be explained further below.

At the entry of the front cable 32 of the bore 30 1st a Bolt 46 is screwed in with a head 47, which ensures the connection of the shaft 22 with the shaft 20 »whereby the bolt awisohen, and the termination 33 in the bore 30 one second cavity 49 is recessed · Xn of the wall of the shaft 30 • Two badia loops 50 located opposite one another are arranged »- which are noticeably sufficient at 45 ° against the Sohauf el level »

BATH 009885/0556

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and moaden in the HoMramu 49 «Sie w © rdsa. actuated "that alternately against the ΆΑβηηά 40 au lie during the rotor rotation graining 'On another Äusführungsf orm opposite the opening Aine sweiten .Kanals ₉ for injecting the air glsichs oils ^ lle _spiolt? -wi0 "d © r channel 41 for the oil injection ·

A cylindrical bore 51 is located along the Bolssenaohse 46 recessed, in the cylinder with a slight sequence Solben 53 is held.

This piston has an axial duct 56 'communicating with a bore 57 ⁱⁿ aylindrisehen Verbindlang which themselves ständet in a circular groove 54' *

In the head 57 of the bolt 46 at least one radial section 52 is left "which is extended in a rope at a right angle" which opens through an opening 55 on the front string of the head 47. " Pre-cut openings 55.

The piston 53 carries on it, outside of the bolt 46. on the other end · an adjusting knob 60, 4 freely rotatable on this Bath is stored »and has an» im Bohlzaum 49 mounted sparring 61 on «

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009 885/055 €

The piston is actuated so that when it is at its maximum after been pulled in front safe, the ring or the disc 61 itself against the rear end of the Bolson 46, the Bore 55 is located opposite the groove 54 (Pig · 5 and 4) » which corresponds to an open position sum of air intake, if, on the other hand, the solenoid 53 is pushed onto the bolt 46, so is the connection of the cavity 49 with the outside interrupted due to a seal 75, which the solen 53 surrounds what corresponds to a closed position

A plate 63 pierced in the middle at 64 is 1st placed on the extension 59 of the solenoid and is through Springs 66 on the front side of the roller 22 rttokgesteiled ·

An annular groove 70, which covers the plate 63, is left on this front side, with the sod of the! Doing an inclined Paragraph 61 forms, in which balls 72 are stored

If the roller 22 is immovable, the pedals 66 press the disk 63 firmly against the roller, the latter pressing the balls onto the bottom of their bearing and holding them tightly against the front face of the head 47 of the piston 46.This is a precautionary measure · Provided with seals 76 surrounding the openings 55 (Fig. _{9 5).} So are the openings 55

ORIGINAL

009885/0556

closed »the tree 49 is not in line with its surroundings Link.

If, on the other hand, the rollers 22 rotate, the balls change under the action of centrifugal force gradually on the inclined ramp 71 on the Pe & em. 66> u, lift the plate 63 which exposes the openings 55 and the cavity 49 with the environment (Pig 4) in connection

It is therefore possible to press the solenoid 53 into the closed position, so that this connection can be interrupted.

As soon as the movement of the roller slows down before it comes to a standstill, the disk 63 is pressed again onto the roller and thus isolates the cavity .49. "Ζ" - ■ ■. ■ ".. '. ■■". -; "■ / \ ; ';' ■ ■:.:

They have slots 50 which periodically connect cavity 49 with the chamber of the stator via the Sräanut 40 and the channel 41 seteen, are arranged so that this compound is sets for each working period »i.e. sweimal for each Rotor rotation; after the oil fuel phase, which itself is the Moment follows in which the flap valve 47 is again sohlieset (Fig. 6), prevails in the rope of the chamber 1 i, in into which the channel 41 opens, practically the pressure that is present in the evacuating space * during the in the drilling room 49 the resulting pressure is equal to the ambient pressure.

0098 85/0 55 6 BADORLGiNAL

Under these conditions, the © according to the invention works on ge ~ how/

For oil injection, the ElnselkaBaner 36 is brought twice per revolution with the oil of the housing via the line 44 and the line 43. Me KaWHBX ₉ in which there is a bridge lower than atmospheric pressure »so it is filled with oil · After a fraction of a revolution later it becomes in

** "" Connection with the milled groove 40 and the bedding 41 with the rotor chamber 11 brewed * whereby the blades then occupy a lake shown in FIG. In Sammer 11 there is practically the bruok of the tree to be evacuated ”and a rope of the oleo of the brush chamber is carried into this sammer, the rotor turns“ parent turns, the oil injected in this way takes the ik der near the end of the compression lamn & r available tolumen ^. one and favors so In well-known

^ Wise the evacuation of the gases «

This entrainment of the oil in the pump evacuating space created vacuum is created, does not arise »if in the last still about atmospheric pressure prevails; the lubrication of the pump can become insufficient »if this condition persists ·

In other words, the lubrication θiohoraueteilen, is according to Isduags an oil supply above the emptying valveB so provided that during the pushing up, which

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of the H ^ sdsx-feJ / lGns clas tensile- © l & tEitt and that lasts all the longer, 3 © longer the valve rises noticeably in these areas of the pressure, © in the sell of the oil. The pump re-enters VBOa. ensures lubrication «

This oil supply can be done via an Eanal 77 (Pißo 2) _? dipping below the outside Ölsijandes 7S opens _s in the stator and in iaaea fien Svalcuisrusgskanal töer the .Elappveatil 27 * erf olgea

The air introduction or -einepritsung, as geseigt, only be ₃ wonnder rotor has a certain speed, (its normal Arbeitsgesolrafindiskeit) _e reached hato chooses the operator for an oil injection, so Isann it so by pre-drawing the button 60 the cavity 49 with the Connect the environment. If you want this air injection to be stopped, then it is possible to push button 60 back.

One of the parts of the described arrangement lies in the additivity of the organs which are intended to safely carry out work processes that are becoming increasingly difficult. Be a pump that needs to evacuate condoneable steam, what is used in the actual "B, B _{0" in the Phyeik}

00988570SS6 bathroom

enclosed®?!. Trees of the? Case lsi, it is sufficient alone vorsusehen the uleinspritzYorriohtung through which the dead space fcird canceled · It is therefore sufficient that ÖHsaramer 36 in the axis together with supply "- _p 1muen without Rttoketrömsperre and Emkuierungsleitungen ▼ orsuseheno Will you teinspritzung a pump with EUF - if this device is not desired for any purpose - it is sufficient to fix the roller 2u Yerändam, since the axis of the pump was equipped with openings 50 from the outset, which are necessary to form a distributor, see below; but this means only an insignificant complication »

In the most complete case in which air is injected at the same time and if you want a reverse flow barrier for this injection, it is sufficient to use the simple Bolle with one Centrifugal lock, see B, to replace the one described

009885/0556

Claims (1)

T678245 P at en la a e ρ r ti ο Ii β Mechanical yakuumpumpo with air and oil supply ~ injection, ttobei ia © laem stator © in itself ', -uxelhm &&! The rotor is mounted, of which with ¹ OaMQgIlQhQn blades eiaea tree variable Yolumons a "bg? Emjt and a ° bweoliBelna periodically with oinem au evBlniIer © n <äöxi Baiaaj is once connected to the, d & äurch ^ gekeanaeichaet, d & S zum introduce dos oil a Zyisohenspaicher or an island ^l - . -: ■ ■■■ '■■■■■■: ■. '■ - ■■■, ■: * ■>"'" ■ kearner relatively large YolBmöjss, which is above 1 ^ of the minimum volume of the mriable tree, is recessed in the rotor of the pump; and that facilities are arranged for this, which connect it alternately with an oil reservoir and with this space of variable volume. ' 2, The pump of claim 1, characterized in "that are provided for the injection or introduction of air Verteilervorriohtungon _s of Rotorachso ■ setaen eu a set time the working period length the space of variable volume with a passage in. Connection which mündetj outwards and that Furthermore, Vereohlußeinrichtungen ^ provided, which, independently of the first-mentioned devices, closed the mouth of this passage to the outside, teenn the Qesohwindiglceit of the Rotere below 009885/0558 1B28245 of a given value «in particular of the rotor. 3 <, pump according to claim 2, characterized in that "the locking devices are controlled by centrifugal force" 4. Pump according to claim 3, daduroh gekennaeichnet that the devices with centrifugal force © control are assigned to a handwheel wedged onto the rotor axis and have a disc which is pressed elastically against a surface of the handwheel in such a way that the mouth of the Terbindungsdurchlaß cause, and that each side of the disc and an inclined shoulder recessed within the handwheel surface balls are provided _p whereby by turning the handwheel a radial displacement of the balls, a lifting of the disc and an opening of the mouth of the connecting port is caused 5 · Pump according to one of claims 2 to 4 »daduroh characterized, that the dividing devices have at least one radial base recessed in the rotor shaft, which is inserted into an axial cavity ~ of the rotor opens, and that a line is cut out in the stator L 'one end of which flows into the space of variable volume » 009885705S6 - 17: - ^ - "■■■■ - · ■ -. - and dersn asid © 2? © s ~ pillar. opposite d§r ^ duroli the at the Brehüsg of the rotor Tiberair-drawn Son © arranged 6 «Pump to © in © m des? MspsUelie 2 to 5? dad «ü? oli gckonnaeiclmet» that one TerscliXiißeinrioMimg with hand control the ter- · in the Eotoracha © imal> liingig from the fore closes » 7. Piimpe a «xh claim 6, dadm: ^j uh gokannaeiclmotj that the has a Hopsolben ₉ the sliding de? Hotoraohse ang9l) »aont and whose free end, which penetrates the TeraohluSscheifee, carries an adjusting button, whereby the yerso displacement of the piston enables the connecting diameter of the hotor to be closed. Pump according to one of claims 2 to 7 _P daduroli in that the E & EGllcainmer ansohlieseend is recessed in the rotor of the Ölei.nspritsvorriohtung to the Axialiiohlraum the LufteinspritzTorriontung. .9. Pump according to one of the extras 2 to 8, characterized in that that the smooth stator line for the Sufteinspriteeinrichtung and the oil injection direction is used. PATBNTANWXiri DR.-ING.H.FINC «DIPL.-ING.H.iOHR 0Ö9885 / 05S6 «ad original-