DE1428238A1 - Improvements to a turbo-molecular vacuum pump - Google Patents

Description

PATIHIAHWAIT SAUBTTBG 86 ■ NBUSB WALL 411 · FSBNBTXF St 82 88 TTNB 3β 41 IS

HLISSIHH-IISOHIIIII

SOGIETE NATIONALE D ¹ ETUDE ET DE CONBTHJOTIOIi DE MOTEUES D'AVIATION

150 »Boulevard Haussmann
Paris - Seine - France

27 July 1962

Improvements to a turbo-molecular vacuum pump

The invention relates to a turbomolecular vacuum pump, which is based on the principle of a compressor and is designed to work in a very low pressure range, which corresponds to the molecular range, with the delivery of the dilute gas by an arrangement of successive, circular disks that alternate are immobile and rotating and in which openings are arranged such that the probability of passage dei Molecules is larger in one direction than in the other «This effect is based on the shape and the arrangement of the openings as well as on the velocity vector with respect to the molecules with regard to the blades formed by these openings «,

A device of this type is in the German patent application S 78 975 Ia / 27c of April 12, 1962 "Turbomolecular Vacuum Pump" been described "

909832/0223

The present invention relates in particular to the

U28238

- C. - -

Order of the openings in the disks of the devices

According to the invention, these openings are made by slots formed in each disc and distributed over an annular zone of the latter, the Slots preferably bordered in this way on the opposite sides of the disc by protruding lips are that the whole thing appeared in the manner of a blind

According to a preferred embodiment of the invention the slots are arranged radially, but do not extend to the circumference of the disc, so one steady me'tall wreath of the shovels connects with each other »

A disc according to the invention can easily, starting from a flat circular sheet metal disc * processed by a pressing or drawing process »

The following description of a non-limiting example makes in conjunction with the accompanying drawings an embodiment of the invention clearly, wherein

co ^s0 ~

ο the one resulting from the text as well as from the drawing

ot> Details components of the invention are o c *>

ivj I ¹ IgO 1 is a schematic plan view of an ω disk according to the invention,

Figo 2 is a diametrical section along the line

H28238

II the Pig, 1,

Pig 3 shows a section on an enlarged scale from Pigc 1,

Pig 4 is a partial section on an enlarged scale along the line IV-IV of Pig 1,

Pig 5 is a corresponding sectional view of another embodiment,

Pig 6 are partial views of construction details and 7 along the line VI-VI- of Pig _e 1.

In the drawings, a disk D of the turbomolecular vacuum pump is shown, their construction and Assembly parts are not carried out further; because they are not indispensable for a good understanding of the invention. Otherwise, these are construction and assembly details disclosed in the German patent application, which on that day for a "turbo-molecular vacuum pump" was submitted

J ₀ according to the invention are in an annular area

co Z of the disk D openings in the form of radial

to slots F arranged, which are inserted by the lips L1-L2

^ are summarized, which protrude on the two opposite sides K ₃ th of the pane D, the sequence of these elements resembles a blind »The lips L1-L2

can be extended straight to each other - 4- bath

are as shown in Figure "4, or they may have a slight deflection in the ^{ra tio} have each other, get different angle au at the inlet and at the outlet, as shown in Fig. 5 · You could also have a continuously curved profile"

It must be noted that, to avoid any accidental Contact between the successive solid and to avoid rotating disks, the axial Eaumbed ** arf the lips L1-L2 not larger than the axial space requirement the target D may be executed; this takes into account the shingling of the successive slices «

The radial slots F do not open on the circumference the disc. D, whereby a continuous metal ring C which connects the blades together »

To keep the slots F moving in the material To prevent the disc in the form of cracks or other hoisting, one arranges at the extreme ends this slot a plate P (see Fig. 2 and 6) or a small round hole T, which is parallel to the axis of rotation or is crooked »

Machining such a disc becomes easy

achieved in that a flat ring-shaped metal

909832/0223

BATH ORIGINAL

disc is cut or sheared and pulled or pressed with the same tool · Pressing or pulling takes place on both sides of the disc in order to maintain the symmetry of the workpiece, the one high speed of rotation allowed

Various changes can be made, especially by replacing equivalent ones technical means without departing from the scope of the invention "

909832/0 2 23

Claims (1)

DR. ING. H. NBGENDANK \ U 2.Β23Β PATENT ADVOCATE HAJIBtTHQ 86 NSTTSR WALL 411. PEHNRtTF 848288 TJND 88 41 18 SOOIETE NATIONALE D ¹ ETUDE ET DE CONSTRUCTION DE MOTEURS D ¹ AVIATION
Boulevard Haussmann
Paris - Seine - France July 27, 1962 Claims HoJ disc for a turbo-molecular vacuum pump, thereby characterized in that on an annular zone (£) openings in the form of slots (I?) are attached which are bordered by lips (L1, L2), which are preferably on the opposite sides of the disc (D) protrude in such a way that the whole thing looks like a Blind accepts «. Discs according to claim 1, characterized in that the slots (J ") run radially Disc according to claim 1 or 2, characterized in that the slots (3?) Do not extend to the circumference of the Disc extend around a continuous metal ^ wreath (C) to get the shovels one below the other k>. vabindeto Washer according to any one of the preceding claims, characterized in that the protruding lips (L1-L2) by pulling or pressing the two sides BATH ORIGINAL-. * "■>: - 2 - a flat, ring-shaped sheet metal disk is designed in order to obtain symmetrical machining of the work piece. " Disc according to any one of the preceding claims, characterized in that a barrier (P, T) is arranged against a wide edge at the slots in the material of the disc at the outer ends of this chute (I). 909832/0223 BATH Blank page