SU1096732A1 - Rotor for synchronous nonsalient-pole electric machine - Google Patents

Abstract

ROTOR SYNCHRONOUS NEYAVNOPOLYUSNOY electric machine comprising a bandage krltso, zakreplennoe1 "rotor barrel by axial displacement cap nut screwed onto the threaded end of the retaining ring to lock the inner annular flange nuts retaining a split ring pyyunku disposed in the annular groove of the rotor drum, characterized in that , in order to increase its reliability due to the reduction of mechanical stresses in the cap nut, gaskets with a material of low power are installed in the annular caiac of the rotor barrel the barrel of elasticity located at least on one face of the locking key.t in

Description

The invention relates to electrical engineering, in particular, to the rotor design of a non-pole main, mainly a turbo generator, or more of a retaining ring attachment unit. rotyra by means of a split ring with internal thread, fitted with a flange, the flange of the split ring being installed in the groove of the retaining ring, and the cut itself a ring screwed onto the rotor drum 1 .. The disadvantages yannoy designs are technological complexities node assembly loading additional retaining ring by the centrifugal forces of the split ring, the split ring possibility scorched to the rotor barrel as a result of unbalance GOVERNMENTAL modes and associated with the violation releasably shroud assembly. The closest to the invention is a synchronous rotor of a non-flashable electric machine, mainly a turbo generator, containing a retaining ring fixed on the rotor barrel from axial displacement, a cap nut screwed onto the threaded end of the retaining ring until the inner ring is inserted into the lock key. located in the annular groove of the rotor barrel. Guykanadevaetsya on the barrel of the rotor to attach the retaining ring. After installing the retaining ring, the nut is screwed onto it in a heated position. The nut is heated to ensure a tight fit on the retaining ring and non-disengagement from the latter in all generator 2 operating modes. A disadvantage of this design is the occurrence of significant thermal stresses in the nut caused by screwing the nut in the heated state, which reduces the reliability of the rotor. The purpose of the invention is to increase the reliability of the rotor by reducing the mechanical stresses in the cap nut. The goal is achieved by the fact that in the rotor of a synchronous non-pole-pole electric machine, containing a retaining ring fixed on the rotor barrel from axial displacements with a cap nut screwed on the threaded end of the retaining ring up to the stop of the inner ring Ellipes in a lock spline ring key and an interlocking spline key. in the annular groove of the rotor barrel, in the annular groove of the rotor barrel, gaskets are installed with a material with a CMM elastic modulus, located at least on one face side of the stopper th key. FIG. 1 shows a rotor of a synchronous electric machine; in fig. 2, 3, 4 and 5 — node 1 in FIG. 1 (installation options P5kladok). - Band ring 1 {FIG. 1) slid onto the rotor barrel 2 and secured against axial movements relative to it by a cap nut 3 with a thread 4. The cap nut 3 in a heated state is screwed onto the retaining ring 1 up to the abutment of the inner annular protrusion 5 of the nut 3 in the stop annular split key b located in the annular groove 7 on the barrel of the rotor 2. The essence of the proposed invention is that in order to reduce the mechanical stresses in the flare nut and increase the reliability of operation in the annular overlay 7 of the rotor barrel 2 (Fig. 1-5) on the front side with supporting the split key set used gasket 8 of a material with a low modulus of elasticity of the order of 2-10 -. Gaskets can be made of insulation, such as fiberglass. Gaskets 8 can be installed on the side of the annular protrusion 5 of the nut 3 (Fig. 2). Gaskets 8 can be installed on the side opposite to the inner annular ledge. 5 (i.e., from the side of the retaining ring 1), to hold the gaskets 8 from the centrifugal forces, the section of the locking ring split key 6 can be made figured with a groove 9 (FIG. 3). To further reduce the mechanical stresses in the cap nut gaskets 8 can be installed at both ends of the locking ring split key b (figure 4). To equalize the contact pressure at the radial height of the insulating gasket 8, the retaining spacing key b can be cut lengthwise from Two parts 10 and 11, and insulating gaskets 8 are installed between the specified key parts (Fig. 5). During operation of the turbogenerator, as well as with a stationary rotor, axial and tangential temperature stresses arise in the cap nut 3, caused by screwing it in a heated state and subsequent cooling. The magnitude of the indicated stresses is proportional to the temperature difference and inversely proportional to the sum of the ductility in the axial direction of the union nut 3 on the free length (between the thread 4 and the inner ring lug 5), the locking ring spline 6 and the gaskets 8.

The gaskets 8 are made of a material with a lower modulus of elasticity than the modulus of elasticity of the material of the cap nut Z. and the locking ring split key. The latter are made of steel with an elastic modulus of the order for gaskets. Insulating materials with an elastic modulus of 2-10 MPa can be used.

The use of the proposed gaskets significantly increases the total

yielding the system in the axial direction and reduces the thermal stresses in the union nut.

The reduction of mechanical stresses in the nut increases the reliability of the retaining unit and the rotor as a whole, eliminating the need to check the quality of the metal associated with the detachable rotor and disassembling the retaining unit.

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Claims (1)

ROTOR OF A SYNCHRONOUS EXPLOSIVELY ELECTRIC MACHINE containing a retaining ring fixed ·! * on the rotor barrel from axial displacements with a union nut screwed on the threaded end of the retaining ring to the stop of the inner ring protrusion of the nut in the retaining split ring ring, located in the annular groove of the rotor barrel, characterized in that, in order to increase its reliability by reducing mechanical stress in the union nut, in the annular groove of the rotor barrel, gaskets of material with a low modulus of elasticity are installed, located at least on one end face of the locking key j J 4 6 Thebes. 1