DE2039264A1 - Device for reducing the losses at low operating speeds of rotary piston machines - Google Patents

Description

DIPE, ING. DIETRICH LEWALD FAT £ NTANWAI.T

8 MÜNOHKN 13

FÜRSTENBEHGSTHASSE 84 _{PART 1} EFON 80 6514

SEN

JLf £ .., 1581.'B.8

SAYIM

Sooiete -Anonyme de VMICuLES MEOMIQUES, SÜEESIES, France

Μ B'EQÜIOIMENIS

Device for reducing egg losses at low loads drive speed

The invention is based on a device that reduces the Iieckverluijte on the circumference of the rotors of especially pumps) or compressors of the gear type.

it is known that these machines perform well only above a relatively high speed due to ■ Submit the Lockflusaes that zv / ischen from the interpretation game

109813/1210

Rotors \ mä stators; where this leakage flow is negligible "at high power outputs, which" high

eii; sn correspond, wii-cU

If the ferv / oiuhmg a oil rather machines at low operating levels' Ui '.'-. DtngifeeitGn, \ ro ate are not ao efficient, always avoid, if such working conditions were necessary, then 1.> © ·' / οι? 2ίΐι $ ^*:; mtui yolmPDtrisehe Puüjpeüi ο flor loEpreesoren the piston ο de j. ' ijohaufelbauart ya verwonftöii _s dii more effective "oei lower; Betrie'bggesotov'inül.gkeitevi b '/ ot'-j Hires higher specific Terbrauchs Bind and ssv / ai ¹ Eii.fgruiul der Uuibuag dor lolbenrings or'. do: i * Sohaui '

g; 3gvi'ii? iB shall .'scloli θ ü.i Enarglevörlnafc vGimieden, i,:, "io <> '*.!. ·» e fin \ -p9.E oäeM' F.on.Mi'efjüoren dei? ^ ahnradbgmart useful bai ai-3Clri £ 5j.vi (faschi / lndi ^ iölfeoa without eiium essential Lelir'ibu.-agi-u '-' arliiiy ';: gsmaeht be solion.,

This uLrci ex'f j..ndungsg®raäß achieved by means of a device to reduce the power output at low speed, whereby this takes into account the parts of the cream over or the rotor of the .Puiapoß odor Kompr-eBeo ^ ea & qx gear type in one axial plane of the rotor in accordance with a contact-producing »with the stators loiigttudlnale and lateral sealing elements are provided, which as the Iteibflache äea stator abut via elastic devices known to rjioh ©, the sealing elements © above a given speed are subjected to a slight reverse pulling movement, whereby on This prevents any friction and thus any friction between these elements on the corresponding surfaces of the stator, the retraction being brought about by mechanical devices operated by centrifugal force.

^109818/1219

Mass. -Arrangement iue, ob.t it possible to chwiMlgke on the area of the low Blessed:]. tan. also. Compressors and pumps. the 'gaharadbauart aiisijwendefl * ,. That is, the strength of the exercise , the sealing el'ifoient against-'dio lo-ngi.tudiiia.len and side walls of the stator, which occurs at -low speeds, which has an effect, "eats a large outflow of the flow to Yerernj which results from c © ii / work cycles ■ swisofesn the.'stator .and or de * -) motors, whereas only the work οά & τ operating aspect between the rotors is maintained.

. Above a "certain Betriehsgescliw-Migkeitj"bei.'der the durch'die Dichtunggelemente ..entwickelten ReiMcräfte below a tiberhitzung or excessive LeistungsTerbrauch impose lead ,, that. Surüc'ksiöhen-leads the _{Hentx'ifugalkraftbetätigten:} Diehtun'gselemeijte zn a Discontinuity of this relationship is it. and e OiB It works .the. .Wieder machine-as usual, Blompressör oclsre Pr rape the 2ahnradb.aua.rt-, wherein the increased power output 'the proportion fles Leclrflusses due vernaclilässigbar of work cycles makes _β.

Such a device is' particularly '"effectiveaia- he . ! Compress or en ■ gum" · Charging, of Pies-elmötoren, whose' speed of rotation depends on the operating speed of the engine, whereas a high compression - '' the- supplied en-air ■■ is essential at low speeds, especially during the idle and ■ start periods «.

A 'preferred' embodiment 'of the device according to the invention should ην η be explained in more detail with the aid of the accompanying drawing in the figure .1 a cross-section along the line Ϊ · -Ι in Figure 2 and shows a compressor of the tooth type with 2 tooth rotors with the device .according to the invention? .Figure 2 is a ..quo section through the top of this compressor along the line ΙΙ-ίΙ 'in -' Figure Ί. ■

Kech, den'Figuren consists of the compressor - of a housing 1, _s are stored in rotatable two 'waves 4 and 5' as well as two 2ahn ~

1 09818/1219

rotors 2 and 3 »which are provided with relief bores 6.

In a slot milled along an axial plane of each Botorzaane are sliding therein a longitudinal sealing element 7 and two lateral sealing elements θ are provided. The sealing element 7 is stretched by two retaining lugs 9, the sealing elements 8 end via a retaining lug 10 in a hook part, which is in locking engagement with bearing pins 11 and 12 at one end of each lever 13 which is pivotable about its axial support axes 14 is.

The other end of each lever 13 is on a small one, in one central housing arranged Hasse 15, which is located in Im • xlalen slot extends to the hole containing the shaft 4 .

Leaf springs 16 and 17 ensure the bearing pressure of the sealing elements 7 and θ against the integral wall of the housing ₀

In operation when the rotors are driven at low speed the device is in the position · In shown in the upper half section in FIG. 2 above the axis AA in this case the pressure produced by the springs 16 and 17 presses the sealing elements 7 and 8 against the inner surface of the housing and thereby ensures the seal; the springs 16 and 17 exert, on the one hand, an axial pressure in the direction of the arrow F ^ the sealing elements 8 and on the other hand a vertical thrust in the direction of the arrows F2 on the sealing element 7 due to of anchoring their ends in grooves 18 of the elements 8, due to their S-shaped shape, which means they are squeezed together in two makes mutually perpendicular directions possible and due to the Storage of the springs 17 on the bottom of the Rotprpchlitzes.

In response to this pressure, the sealing agents 7 and 8 practice that their connecting lugs 9 and 10 bear against the pins 11 and 12 of the lever 13, a little duck on the other End of the fever that is transferred to dl® small mass 15 « which thus remains pressed against the shaft 4.

109818/1219 _ ₅ _

• "-.- ■" ■ * - ■■ '■' ■■

With increasing speed of rotation, the influence of the prevails Centrifugal force in view of the gain factor due to the lever 13 as opposed to the force developed by the springs 16 and 17, increased by the centrifugal force on the Power elements 7 and 8, before.

The small mass 15 then moves away from the shaft 4 and rests on the levers 13, whose long arms in this) moment in a position substantially parallel to the axis AA of the Rotors are located and in turn are on the sealing element 7 store. Me position is as shown in the lower half section of the figure below the axis AA *

The rotation of the levers 13 about their axes H leads over the pins 11 and 12 for withdrawing the sealing elements 7 and 8 into the Interior of the Eotorschlitzies, these elements no longer being in Contact with the inner wall of the housing 1 are located. the The machine works like a normal gear pump without friction contacts between the rotor or rotors and the gorator. The friction, contact will result in a corresponding improvement in the abduction restored as soon as the operating speed becomes less than a predetermined value «

Due to their simple design, the sealing elements advantageously consist of self-lubricating sintered materials »

The relatively strong influence of friction on income the mechanism can be diminished by using stronger springs balanced by small masses of relatively heavy alloys, e.g. lead alloys can be used.

Due to the simplicity of construction, the facility can according to the invention can be easily attached or adapted to rotors of existing machines, which aar calibration for this purpose are not designed. · The costs for this are kept in reasonable limits.

■ '' ■ '■ .. ■.' ■■ .. - 6 109818/1219

If each lever 13 has been fixed on its axes 14, which is itself welded or soldered at its end to the surface of the rotor 2, the small mass 15 is positioned so that the levers 13 are tilted back on it. The sealing element 7, in turn, is brought to the place provided for this purpose, its ends being hooked onto pins 11 of the lever 13; Then the Diehtungeelemente 8, which are provided with the springs 16 and 17, driven into their housing and their retaining lugs 14 are locked on pins 12 of the lever 13.

The assembly is done by laterally removing the sealing element 7 is moved and solved.

The narrow width of the device, which is completely enclosed in the slot receiving the sealing elements, makes one The rotors can be made considerably easier by providing holes or bores 6 therein.

Claims 109818/1219

Claims (1)

Claims 1 «/ device to reduce leakage loss in rotary piston machines with a stator with at least one roto ^ low operating fees, characterized by that on the bath parts of the teeth of each rotor In an axial plane these teeth lateral and longitudinal sealing element (Ti 8) are provided, which are in frictional contact on the inner surface of the stator by the action of elastic devices (16, 17) are applied? that a small mass (15); in the Depending on the centrifugal force is displaceable against this elastic device acts and by mechanical means regulates the retraction of these sealing elements, such that the frictional contact of these elements against the inner surface of the Stator is interrupted as soon as the operating speed exceeds a predetermined value. 2 * device for reducing the Iieckfluss according to claim 1, characterized in that the sealing elements (7, 8) with retaining lugs (9, 10) in the form of ύοά barriers. are stretchable. 3 * Incorporation to reduce the flow of Leok to one of the eggs preceding claims, characterized in that the Mehtungselemente (7,8) made of a self-lubricating porous Material " 4i> device according to claim 1, characterized in that the elastic devices S-shaped leaf springs (16, 17) are. 5V device according to one of the preceding claims, characterized characterized in that the elastic devices are on the same side compressible along two directions perpendicular to one another alad, 109818/1219 β. Device according to claim 1, characterized in that the small mass (15) that can be displaced as a function of the centrifugal force in a central housing in the extension dee Slot is inserted, which contains the sealing elements and is open to the bore of the rotor shaft. 7 »Device according to claim 1, characterized in that these mechanical devices that regulate the retraction of the sealing element G (7, 8) when they are by the little hater (15) are actuated, levers (13) which are pivotably mounted on a single bearing axis (14) and the longer ones Ana rests on the small mass (15), whereas theirs small arms or pins (11, 12) rest against the retaining lugs (9, 10) of the sealing elements (7, 8), these levers against the counterforce come into effect, which is developed by these elastic devices (16, 17). 8. Device according to claim 1, characterized in that all of the elements forming the device are substantially Vjon of equal thickness and in the slot in the axial plane each Rotor tooth are housed in the manner of a housing " 1 0981 8/1219