DE2602136C2 - Impeller assembled from a number of sections - Google Patents

Description

The two sections 14,16 of section 10 each have an edge 18 and 20, respectively, which form arcs with the same radius and which are in the finished pump wheel form its outer periphery. The two leg parts 14, 16 also each have an edge 22, 24 which is the same curved contour like the blade part 12 from the outer edge 18.20 to the inner circumference of the wheel, so that they too when the sections are assembled the finished impeller coincide with the blade parts 12 of the two adjacent sections. the Edges 22, 24 of each section which meet the blades in this way are by means of welded joints of the butt or throat type with the side edges of the blade parts 12 united in this way a continuous, flat cover disk is obtained on both sides of the blades 12. One cover plate is from the leg parts 14 of the sections and the other cover disk is formed by the leg parts 16 of the sections. The flow spaces 30 between two blades 12 are thus on the one hand Side of a section leg portion 14 and on the other side of the leg portion 16 of the adjacent section, as best shown in FIG. 4 can be seen

The individual sections have an edge 32 on the inside of their leg 16, which is an arc of a circle with the center of the finished pump wheel as a radius. The arcs together form one closed circuit in which a hub 34 is provided. This hub is cut off from a pipe and welded to the sections along their edges. On the opposite side, i.e. H. to the Leg parts 14, a sealing ring 38 is attached, which in a similar manner along circular arcs 36, which together form a closed circle on this side, is welded in place.

For this purpose 2 sheets of drawings

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Claims (4)

1 2 that is made up of shell-like sections or channels that can be connected to one another by means of soldering or brazing. The attachment to the 1. Combining a plurality of sections together takes place separately for each section by adding the end jointed impeller, with each section a 5 of each section in an overlapping manner in a groove in the Has a blade and two parts that are inserted into and attached to the peri-hub. The Teilstükpher in the opposite direction from the blade ke a section extend in the same Richweg extend in such a way that the one section device. The invention is based on the object of creating a pump impeller composed of fei and the other part of a flow space io sections, limited on the other side, characterized in that it is simple and material-saving at low cost the sections (14, 16) are constructed with identical effort and in which there is a risk of a table and in each case two level, parallel crevice corrosion is largely eliminated
This task is represented according to the invention by the penrades and between which the 15 characterizing features of the main claim are located in flow spaces, the front connection with the features of the preamble being limited (22) of the one section ( 14) One solves the fact that the parts are identical and each section (10) on the upper edge of the display area forms two flat, parallel cover disks, and (12) a second adjacent section with the end walls of the pump wheel can be saved by means of an essentially coherent housing, whereby a material-saving weld seam is essentially fluid-tight and lightweight construction of the pump wheel is achieved and the rear delimiting edge (24) of the. The sections each extend in opposite sections (16) of the second section (10) in the set direction away from the shovel.
the lower edge of the blade (12) of the first sec- This leads to a much simpler and stabition (10) by means of a substantially coherent construction than with known pump wheels, hanging weld seam is essentially fluid- The fastening of the front edge of the keitsdicht a portion of a first section is attached to the upper one 2. Pump wheel according to claim 1, characterized by the end of the blade of a second adjacent one indicates that each section (10) has a first, inner section by means of a substantially continuous peripheral edge (32) has the weld seam to be finished and, accordingly, the fastening composite impeller in the corresponding rear boundary edge of the other section the cover disk of a closed circular line of the second section at the lower edge of the blade follows and to which a hub is welded to the first section in the same way reduces the 3. Pump wheel according to claim 1, characterized by crevice corrosion, which increases the service life shows that each section is increased by a second, inner circumference. The catch edge (36) has the finish specified in the subclaims set impeller in the corresponding measures are advantageous developments and Cover disk follows a closed circular line.Improvements are possible. 4. An impeller according to claim 3, characterized in that an embodiment of the invention is characterized in that a sealing ring (38) is shown on the inner 40 drawing and is explained in more detail in the following peripheral edges (36) of the description together by the sections shows
set second cover disk is attached. F i g. 1 dss pump wheel according to the invention in a perspective view, F i g. 2 the perspective view of a section, 45 Fig. 3 a section in view from above and F i g. 4 shows a section along the line IV-IV in FIG The invention relates to one of a plurality of FIGS. 1. Sections assembled pump wheel after the pump wheel is in the shown embodiment Preamble to the main claim. form composed of five sections 10. Every second The US-PS 26 32 397 describes one of several 50 tion 10 is formed in one piece of sheet metal that Turbine wheel composed of sections, with a preferably constant thickness and by pla-section one shovel each and one shovel in the peripheral direction from the static machining extending in opposite directions see broadly Z-shaped cross-section Has portions. At the composition of the door- has received. The section has a web 12, the one Binenrades overlap the sections in each direction 55 forms a blade and from which leg sections 14, the respectively neighboring section, with in the over- 16 peripherally seen in opposite directional areas the sections extend point by point with one another. These leg sections extend to the are welded. parallel to each other and in different planes right From GB-PS 4 07 633, one of the sections is angled to the axis of the pump wheel,
The impeller is known, with a section below. They are curved like a show. The assembled befei can start tangentially from the inner periphery. Its known impeller is in a separate housing, as best shown in FIG. 1 ersicht received, which is made of plate or disk-shaped Hch. The vane part 12 can be composed of elements on the radially inner part, the housing walls lying opposite the section opposite the flat cover disk parts being inclined by the vane elements, whereby the inclined angle can be connected in itself. increases in the radial direction outward, as in the In US-PS 7 82 343 an impeller is disclosed, FIG. 3 is illustrated.