CS240487B1 - Elastic ribbed sheet metal, especially the frame of a rotating electric machine - Google Patents

Abstract

The invention relates to a flexible ribbed sheet metal casing of a rotating electrical machine frame with ribs formed by pressed sheet metal bends on the outer circumference. The purpose of the invention is to reduce labor, production costs, reduce energy consumption and achieve optimal conditions for heat transfer from the bundle to the ribbed casing of the rotating electrical machine frame. The desired purpose is achieved by the fact that the closest point of the resistance protrusion weld to the surface of the bundle is at a distance of less than 4.5 times the thickness of the rib wall and greater than 31/2 times the thickness of the rib wall.

Description

240487

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible ribbed skin, in particular a skeleton of an electrical machine of a rotary type with ribs formed by laminated sheets of sheet metal on the outside of the jacket.

The ribbed sheet metal casings, especially those of the electrical-electric rotary machines, are welded or mechanically non-removable by each rib to provide sufficient tangential rigidity. This ensures that the carcass is resistant to mechanical stress arising from pruning the casing with some overlap. The tangential tension created in the ribbed shell of the shell causes a radial compression of the inner shell of the carcass shell, thereby providing good heat transfer conditions to the carcass shell.

The welded connection of the rib walls located in the middle of the rib base makes it difficult to press the stator bundle into the casing, since the weld cross section is generally smaller in comparison to the cross section of the casing and thus the circumferential tensile deformation of the welded casing is concentrated to the volume itself, which, due to its physical properties, does not tolerate large deformations. The flow rate requires extremely narrow tolerances of the diameter of the stator bundle diameter and the inner bore of the skeleton shell in the 10-2 mm range so that, when casting the stator bundle into the skeleton, the projection does not tear one of the rib welds. a ribbed sheet of metal. Analogous problems also arise in other technological and constructional solutions in which the interconnection of the inner walls of the ribbed web ribs is carried out in the immediate vicinity of the fifth rib, ie not allowing the deformation of the carcass shell in the tangential direction by bending. the walls of the rib. In order to convert a larger portion of the circumferential tensile deformation after pressing the stator bundle into the welded casing from the welded material of the walls of the ribbed casing, it is necessary to increase the supporting cross section of the joining wall joins, that is, a continuous bead weld over the entire length of the rib base. energy-intensive.

The aforementioned drawbacks are solved and eliminated by the resilient rib cladding according to the invention in that the resistive protrusion welded by the rib wall of the ribbed sheet metal is displaced to a distance from the bottom of the rib to create favorable conditions for participation of rib deflection walls with weld and rib heel on the total required deformation of the sheet metal rib when the stator bundle is pressed together. The essence of the invention is that the inner walls of the ribs of the sheet metal rib are joined together by a resistive weld, the welded lens of which has its closest point to the surface of the strand, whereby the resilient ribbing is pressed, at a distance given by the φ-b ^ 4.5. skde denotes: s - ridge of the rib wall b - distance of the closest point of the welding lens from surface surface

The resistance weld can preferably be formed by a resistive projection weld.

By providing a flexible ribbed skin according to the invention, i.e. by placing the weld of the inner walls of the ribs at a greater distance from the base of the rib, favorable conditions are created for the pressed-in harness into the carcass. When the walls of the ribs are pressed in the fifth zone, they open (in the order of 10 ~ 2 mm), rather than the number of ribs, the total tangential deformation of the flexible sheet metal can be 10 mm 1 mm. it will reduce the likelihood of damage to the ribbed cladding when crimped, and the labor costs will be reduced due to the reduced manufacturing accuracy requirements of the parts.

The area of mutual manufacturing of the bundle and the ribbed sheet metal is expanded, with which, by using the subject matter of the invention, an approximate equal pressure between the bundle and the ribbed cladding is provided, and thus the conditions for the dissipation of the loss heat from the bundle. An example of an embodiment of a flexible ribbed sheet metal according to the invention is shown in the attached drawing, wherein FIG. 1 is a partial cross-sectional view of an electrical machine rotating in a resistive projection weld of the inner walls of a ribbed sheet metal rib; and FIG. 2 is a cross-sectional view of the rib along its longitudinal axis with the resistor projection welded lens shown.

The flexible ribbed sheet metal shell of the present invention has internal ribs 7 of the ribs 8 connected by a resistive weld 2, the welding lens 1 of which has the nearest point 3 to the surface 4 of the bead 5, on which a ribbed sheet 6 is mounted at a distance b, which may be greater than 3Ί] 2. the ridge with rib walls 8 and smaller than 4.5 times the ridge with rib walls 8. The resistance weld 2 can be advantageously formed by a resistive projection weld.

The inner walls 7 of the ribs 8 behave as tangled beams with a free end in the region of the fifth rib when tangentially stressed on the ribbed sheet metal S, pressing the ribs 8 into the ribs as a result of the tangential force perpendicular to the ribs. their flexible sag in the frame

Claims (2)

SUBJECT An elastic ribbed sheet metal casing, in particular a skeleton of an electric rotating machine with ribs formed by crimped sheet metal folds on the outer circumference of the sheet casing, characterized in that the inner walls (7J of the ribs (8) are connected to each other by a resistance weld (2), 1) has its closest point (3) to the surface (4) of the exterior (5) on which the flexible ribbed metal sheet (6) is pressed at a distance (b) given by: OF THE INVENTION ³ νΣ. s <b <4.5. with. where it means: s - rib wall thickness b - distance of the nearest point of the weld lens from the surface of the beam. 2. A ribbed sheet metal sheet according to claim 1, characterized in that the resistance weld (2) is formed by a resistance weld.