CS246025B1 - Ribbed welded sheet metal skeleton of rotating machine - Google Patents

Abstract

The invention relates to a ribbed welded sheet metal frame of a rotating electrical machine, with ribs formed on the outer circumference, the bases of which are connected by a discontinuous weld. The purpose of the invention is to reduce energy consumption and labor, speed up production and achieve optimal conditions for heat transfer from the stator bundle to the ribbed shell. The stated purpose is achieved by the gap formed under the rib base in the zone outside the weld having a maximum width smaller than the gap in the weld area.

Description

246023

BACKGROUND OF THE INVENTION The invention relates to a ribbed welded skeleton of a rotary electrical machine, with ribs formed on the outside, the fifth of which are connected by a discontinuous bead.

The ribbed sheet metal, especially the skeletal-electric rotary machines, which have fins formed by the outer circumference of the fin, to fulfill their function, must be connected to one another in the region of the rib base. This increases the stiffness of the reference casing in the tangential plane that occurs when the rib is pressed of a stator bundle, with a surplus overhang, into a ribbed shell. The various methods of joining the walls of the ribs to increase the stiffness of the ribbed cladding have different energy and technological disadvantages. The arc welding with a continuous weld is very energy intensive and causes deformation of the welded ribbed jacket. The realization of the discontinuous weld, in particular, by using the welding method with the application of the additive material, makes it difficult to form a welded bead which does not exceed the ribbed skin plane forming a stator bundle in the next contact surface. This technology, in the vast majority of cases, requires the subsequent processing of the weld joint to remove the weld metal protrusions, which does not interfere with the contact surface, and substantially reduces the loss of heat loss from the stator bundle to the reference shell.

The loss of heat generated during the operation of the electric rotary machine is to be drained to prevent excessive warming of its active parts and to break the insulating winding system. A large load of electric rotary machines uses cold air. The effect of the air ionization in the first row depends on the quality of contact and the size of the heat transfer surface between the stationary bundle and the ribbed carcass. The quality of contact of the heat exchange plates, the stator binder - the skeleton of the electrical machine, also depends on the specific pressure which is determined by the rigidity of the carcass to which the stator bond is pressed.

The skeleton heel feet are welded from the inside to prevent the opening of the ribs when the stator bundle is pressed, and this also stimulates the stiffness of the skeleton and the specific pressure on the junctional skeleton and stator bundle. The gap in which the weld of the fifth rib is realized must be wide enough so that the projections of the weld do not protrude through the interface with the inter-ribbed frame and the stator bundle. the size of the heat exchange surface between the frame and the stator binder is substantially reduced.

The aforementioned drawbacks are solved and eliminated by the ribbed welded metal frame of the electric rotary machine according to the invention, the principle of which is that the maximum width of the gap in the radial plane of the jaw to the longitudinal axis of the rib in the zone of the weld is less as the maximum width of the weld area. The ribbed welded skeleton according to the invention will increase the size of the heat transfer surface depending on the skeletal density of the skeleton up to 20%. The solution of the frame according to the invention provides the conditions for the realization of the weld joints of the fifth rib with a substantially wider choice of welding process parameters by the possibility of creating stronger welds with a larger bearing cross section, while reducing the danger of creating a blanket at the deviation of some of the can welding parameters.

At the same time, the construction of the ribbed casing according to the invention also reduces the need for the positioning of the ribbed casing to be welded and completely eliminates the need for additional machining aimed at removing the weld projections. This results in a reduction in labor, speed of the production flow, reduction of the built-up area and technological equipment for the production of ribbed cladding. The ribbed cladding according to the invention also provides a good thermal conductive contact with the stationary bond. An exemplary embodiment of a ribbed sheet metal casing according to the present invention is shown in the accompanying drawing, wherein in FIG. 1 a cross-sectional view of the carcass rib of a rotary electrical machine in a radial plane is shown outside the fifth rib weld; FIG. 3 shows a portion of the expanded skeleton of the electrical machine of the rotary machine with respect to the shape of the maximum width of the gap below the fifth rib.

The ribbed sheet metal casing 8 is made such that the gap 1 formed below the rib 21 of the rib 2 due to the wall bending 22 of the rib with the rib 2 has a maximum width of the weld 3 in the band 3 outside the weld 4 4 in the radial plane of the perpendicular longitudinal axis 23 the maximum width d. The maximum width b of the gap 1 in the fifth region 21 of the rib 2 in the zone outside the weld 4 is less than the maximum width d of the gap 1 below the fifth 21rebra 2 in the weld region 3.

After pressing the sheet metal casing 8 onto the stationary gear 7 of the rotating electric machine, these contact the flat surface 6, thereby increasing the heat transfer from the stationary bundle to the ribbed casing and, ultimately, in addition to improving the electrical machine parameters.

Claims (2)

246025 PREDMET 1. A ribbed welded metal frame of an electric rotary machine, with recesses formed on the outer circumference, the joints of which are connected by a discontinuous weld, characterized in that the maximum width (b) of the invention is dorsal (1) in the radial plane perpendicular to the support axis (23) of the rib (2) in the zone (3) of the extrusion (4) is less than the maximum width (d) of the gap (1) in the weld region (5). 1 sheet of drawings