The rotor of a centrifugal compressor

 

(57) Abstract:

The invention relates to a compressor engineering, in particular to the rotor high-speed centrifugal compressors. The rotor of a centrifugal compressor includes a shaft and mounted thereon impeller. Wheel hub made of a ring cavity, separating the hub to the inner and outer rings and bounded on one side annular wall connecting the inner and outer rings of the hub, and on the other, a rotating guide vanes or Radome installed along the stream in front of the impeller. Between the inner ring of the hub and the shaft on the plot side walls made annular gap. Coupled with the shaft of the landing surface of the inner ring is offset baffles in the side of the fairing located on the outer surface of the walls at a distance of 0,1-0,15 outer diameter of the impeller. The technical challenge is to improve the reliability of the rotor of a centrifugal compressor by reducing the radial deformation of the Seating surfaces of the impeller. 2 C.p. f-crystals, 1 Il.

The invention relates to a compressor engineering, in particular for high-speed rotors CE the impeller semi-open type and is placed before the last in the course of the flow rotary guide apparatus and fairing [Snepp Century B. Design and calculation of centrifugal compressors, Meters, machinery, 1995, S. 39, Fig. 1.23].

The disadvantage of such a rotor is relatively large axial and radial deformation of the impeller. Axial deformation, in particular, edges of the impeller vanes associated with the fixed elements of the compressor body, causes the execution of relatively large gaps between the blades and the fixed elements, which increases partecke gas and reduces the efficiency of the compressor. Radial deformation of the hub of the impeller reduces the set tension and the contact area between the seat surface of the wheel and the shaft, with the reliability of the connection is reduced.

Also known rotor centrifugal compressor containing the shaft and placed it semi-open impeller, the hub of which is made annular cavity, separating the hub to the inner and outer rings and bounded on one side annular wall connecting the inner and outer rings of the hub, and the other rotating guide vanes or Radome installed along the stream in front of the impeller [RF Patent N 2109172, F 04 D 17/08, 29/28, 1995].

However, in this rotor has radial strobing forces from the peripheral mass of the impeller. Radial movement of the landing surface reduces the set tension and the contact area between the wheel and the shaft. The increasing tightness in the "stock" does not solve the problem, because the contact stress in the connection exceed the allowable values.

The technical challenge is to improve the reliability of the rotor of a centrifugal compressor by reducing the radial deformation of the Seating surfaces of the impeller.

This task is achieved in that the rotor of a centrifugal compressor containing the shaft and installed it the impeller, the hub of which is made annular cavity, separating the hub to the inner and outer rings and bounded on one side annular wall connecting the inner and outer rings of the hub, and on the other, a rotating guide vanes or Radome installed along the stream in front of the impeller, between the inner ring of the hub and the shaft on the plot side walls made annular gap, and coupled with the shaft of the landing surface of the inner ring is offset baffles in the side of the fairing located on the outer surface of the walls at a distance of 0.1 - 0.15 nolza hub, at least part of its length, can be made with a diameter decreasing in the direction of the landing surface to mate with the latter. On the area of the annular gap facing to the shaft surface of the inner ring hub with decreasing diameter can be made conical, and its forming to be forming a Seating surface angle 0 - 45o.

The drawing shows the rotor of a centrifugal compressor, a longitudinal section.

The rotor of a centrifugal compressor includes a shaft 1 and fixed therein the impeller 2, a semi-open type. In the hub of the impeller 2 has an annular cavity 3, separating the hub on the inner 4 and outer 5 rings and bounded on one side of the annular wall 6 connecting the inner 4 and outer 5 ring hub, and on the other, a rotating guide vanes 7 or system 8 installed along the stream in front of the impeller 2.

Between the inner ring 4 of the hub and the shaft 1 between side walls 6 are annular gap 9, and coupled with the shaft 1 landing surface 10 of the inner ring 4 of the hub shifted relative to the partition wall 6 in the direction of the fairing 8 and is from CLASS="ptx2">

On the area of the annular gap 9 is turned to the shaft 1, the surface 12 of the inner ring 4 of the hub, at least a portion of its length, is made with a diameter decreasing in the direction of the landing surface 10 to mate with the latter. The surface 12 of the inner ring is made conical, and it is forming with a forming a Seating surface angle 0 - 45o.

The rotor operates as follows. A gaseous medium is supplied to the input rotating guide vanes 7. During rotation of the rotor, the working environment is sent from the input rotating guide vane 7 to the exit of the impeller 2. In the force interaction of the working environment with the surfaces of the blades rotating guide vanes 7 and the impeller 2 mechanical rotational energy is converted into kinetic and potential energy of the flow.

When the rotor is a radial deformation of the impeller 2 of the centrifugal force. The presence of the circular cavity 3 causes the characteristic deformation of the inner ring 4. The magnitude and intensity of deformation of the inner ring 4 has two characteristic sites. First, directly adjacent to the partition 6 and nakhoda intensity changes movements. The axial length of this section, conventionally defined by the lower radial movement to 0.01 mm is 10 - 15% of the diameter D of the impeller 2. The second section, the remainder of the inner ring is characterized by the minimum radial displacement. Small displacements of this area due to the influence of centrifugal force on rotation of the mass proper of the inner ring 4, which is many times less than the mass of the peripheral part of the wheel.

The location of the Seating surface 10 at a distance L from the outer surface 11 of the partition 6, comprising 0.1 to 0.15 of the outer diameter D of the impeller 2, excludes the impact of the landing surface 10 of centrifugal forces from the peripheral mass of the impeller 2. The specified distance L is optimal. Positioning the landing surface 10 at a greater distance is impractical, as this increases the length and weight of the impeller, deteriorating dynamics of the rotor.

The running surface 12 of variable diameter reduces stress concentration on the inner surface of the hub and increases cyclic strength of the wheel.

Thus, this embodiment of the rotor of a centrifugal compressor providing the feet with virtually no radial deformation of the mounting surface. The absence of radial deformation of the Seating surface of the hub of the impeller allows you to save a preset tension and the contact area between the impeller and the shaft and thereby to enhance the reliability of operation of the rotor.

1. The rotor of a centrifugal compressor containing the shaft and installed it the impeller, the hub of which is made annular cavity, separating the hub to the inner and outer rings and bounded on one side annular wall connecting the inner and outer rings of the hub, and on the other, a rotating guide vanes or Radome installed along the stream in front of the impeller, characterized in that between the inner ring of the hub and the shaft on the plot side walls made annular gap, and coupled with the shaft of the landing surface of the inner ring is offset baffles in the side of the fairing located on the outer surface of the walls at a distance of 0,1 - 0,15 outer diameter of the impeller.

2. The rotor of a centrifugal compressor according to p. 1, characterized in that at the area of the annular gap facing to the shaft surface of the inner ring of the hub at least part of its length done the R centrifugal compressor under item 1 or 2, characterized in that at the area of the annular gap facing to the shaft surface of the inner ring hub with decreasing diameter is made conical, and it is forming with a forming a Seating surface angle 0 - 45o.

 

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