SU569750A1 - Multilayer disc of turbine-molecular pump - Google Patents

Description

(54) MULTI-LAYER DISC TURBOMOLECULAR PUMP

I

The invention relates to vacuum technology and can be used in turbomolecular pumps.

A disk of a turbomolecular pump is known with blades pressed from thin metal sheet JlJ.

However, in such a disk, the density of the lattice has a limited value and cannot vary within the required limits.

Also known is a multi-layered disk of a turbomolecular pump with stamped blades 2,

The blade grids in such a disk are made by radial cuts of the circular billet and the subsequent turning of the blades formed at the desired angle.

Such a disc is closest to that proposed by the technical nature.

However, its rotational speed is limited by the centrifugal load on the disk hub.

The aim of the invention is to improve the vacuum characteristics of the disk.

This is achieved by the fact that in each layer, near the shoulder blades, there are cut-outs,

mixed relative to the cuts of adjacent layers and having a width that is a multiple of the blade's blade width, with multiplicity, an even number of layers without one. When performing a disk with a bandage at the jumper; blades in the house layer can be made three holes, the middle of which has a width that is a multiple of the lintel width.

The drawing shows a schematic disc.

The multilayer disk of a turbomolecular pump contains forged blades 1, in which in each layer there are made cut-outs 2, offset from cut-outs of adjacent layers and having a width I, multiple of the width $ legs of the blade 1, with a multiplicity equal to the number of layers without one. When performing a disc with bandage 3 and re. sliver blades 1 in each layer there are three associated holes 4; 5 and 6, the middle of which (hole 5) has a width of 6j times the width of the lintel. The blades 1 are located on the hub 7.

When assembling the layers of the disc, the hub 7 and bandages 3 are tightly attached to one another, and

The blades of one layer are placed between the blades of the other layer and a radial blade is formed with the required lattice density. The density of the grate opatok in each layer is chosen from the conditions of reducing the loads on the hub and g

ensure the density of the disk grille assembly. In a similar way, the proposed disc will increase the lattice density, increase the rotor speed, and thereby improve the vacuum evacuation characteristics of the turbo-Q molecular vacuum pump.

Claims (2)

1. A multi-layered disk of a turbo-molecular pump with forged blades, characterized in that improvement of the vacuum characteristics; in the blades, in each layer, there were made cutouts mixed with respect to the cutouts of adjacent layers and having a width that is a multiple of the legs of the blade, with multiplicity equal to the number of layers without one, 2. The disk according to claim 1, which includes the fact that when it is performed with a bandage at the lintel of the blade, three connected holes are made on each layer, cpe / tn of which has a width short for lintel . Sources of information, taken into account during examination: 1, Franndia's Patent No. 13О6013, Cl, T 04 p 19/04, 1962. 1. The patent of France No. 2074450, class, G 04.V 19/04, 1970.