FI61232C - FOER EN PUMP AVSETT SKOVELHJUL - Google Patents

Description

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Ma [b] 11 ^ utlAggningsskkift 612 32 C .... Patent granted 10 06 1932 * iO «Patent raeddelat (51) Kv.lk?/Int.CI.3 f 04 D 29/18 FINLAND —FINLAND (21) PMMttlh > k «mu« -PatmtaMeiuiln | 7602U0 (22) Hak «m)» ptlvt - Anteknlngtdig 30.01.76 * * (23) Alkupllvl — Glfclfhaadag 30.01.76 (41) Tullut kiikikuksi - Bllvlt offamllg 26.09-76

Patent and Registration Board, ._, _ '. (44) Nlhttvlktlptnon And the date of the month. -

Patent and registration authorities Anttkan uttagd och utl.tkriftan publkarad 26.02.82 (32) (33) (31) Pyyd · ** / atuolkaut — Begird prlorttat 25.03.75

Sweden-Sweden (SE) 7503 ^ 78-5 (71) Sonesson Pumpindustri AB, Box 50 ^ 9, S-U02 21 Gothenburg 5, Sweden-Sweden (SE) (72) Aron Olsson, Mölndal, Sweden-Sweden (SE) (7 * 0 Oy Kolster Ab (51 *) Pump impeller - For the pump avsett skovelhjul

The invention relates to a pump impeller assembled from interconnected blocks to form vanes arranged around two cover plates and an impeller located therebetween. Such impellers, also called closed impellers, are in practice most often formed by some casting method, in which the vanes are cast together with two cover plates. Impellers, especially those with a low so-called specific speed, there may be a relatively small clearance in the axial direction at its outer circumference or outlet. This causes difficulties when casting from a metal material, as the possibility of cleaning and cleaning the inner surfaces of the pump is limited to the same extent as the orifice has a small width, which in turn affects the surface fineness achieved and the degree of influence that depends on it. In addition, cast impellers most often have differences in the distribution of the substance, which causes laborious and expensive work to balance the wheels by removing or adding the substance in different parts around the wheel. An example of a known solution is DE patent publication 3 685 63, which has a wing circumferential 2 * 1 2 7) 2 which is stamped and pressed from a single piece of sheet metal. The perimeter shown in the figure of the publication is provided with eight wings. However, in addition to the above-mentioned circumference, the impeller is assembled using a hub flange and a cover plate, so the structure becomes complicated and relatively expensive.

DE-A-370 845 discloses a fan comprising, on the one hand, a plate and, on the other hand, vane elements formed so as to delimit one side of each flow space. In this structure, therefore, only one part of each block extends from the wing to the adjacent wing. As a result, several different parts are needed to form the structure and the material is not used in the best possible way.

DE 968 553 discloses a fan comprising a separate support plate on which the blades are mounted.

The wings consist of a hub part provided with an extension. Each extension is in an interlaced position with an adjacent extension, each extension forming a separate cover plate. Thus, even this structure requires several different components, so it is relatively expensive.

The structure of GB patent publication 419 252 substantially corresponds to the structure of DE patent publication 368 563, so the disadvantages are the same.

The structure of U.S. Patent No. 2,899,129 also uses various components to make a fan impeller. The disadvantages are the same as in the above-mentioned GB publication.

CH Patent 435,989 discloses a pump impeller assembled from three plates, namely two substantially flat outer plates and one inner plate bent to form vanes. This structure is not economical because of the high material consumption. This structure also does not provide wings with so-called double curvature, which limits the use of the structure.

The structure described in U.S. Patent No. 3,362,338 has the same drawbacks as the structure of the aforementioned CH publication.

The object of the invention is to obviate the above-mentioned disadvantages and thus to provide a pump impeller which can be manufactured at low cost, with the desired surface fineness and perfect balancing without special measures, which is achieved substantially by the portions extend 3 61232 in peripherally opposite directions from the wing to the nearest nearest wing # so that one portion is positioned to limit the flow space on one side of the wing and the other portion on the other side of the wing. Thus, each part has an approximately Z-shaped profile as seen in a peripheral section, and the flow space between the two wings is always limited by parts bent in different directions by two adjacent parts. Other preferred embodiments of the invention are set out in claims 2-4.

When using metal materials that are joined together by welding #, the welds are butt or small seams and can be made by quick and simple methods. The individual parts are made of sheet metal by plastically machining into the desired Z-profile.

The invention will be described in more detail below with reference to the exemplary embodiment # shown in the accompanying drawings, whereby other features characteristic of the invention are also described.

Figure 1 shows an impeller made in accordance with the invention; Fig. 2 shows a part of the previous wheel in a perspective view; Figure 3 shows a plan view of a part; and Fig. 4 shows a cross-sectional view of a part along the line IV-IV in Fig. 1.

According to the embodiment shown, the impeller of the pump is assembled from five blocks 10, each of which is formed in one piece from a metal plate # preferably of uniform thickness and which is given a cross-sectional shape approximately Z-shaped in the peripheral direction by plastic machining. The block has a web 12 which forms a wing and from which the portions 14, 16 extend in both directions when viewed peripherally. These parts are parallel to each other and extend in different planes at right angles to the impeller axis.

The wing part 12 is shaped according to the principles of flow technology in an arcuate shape. The wing may start tangentially at the inner circumference # as best seen in Figure 3. The wing portion 12 may be positioned obliquely relative to the coplanar cover plate portions 14, 16 at the radially inner portion # of the portion, increasing the angle of inclination radially outward, as shown in Figure 3.

The two parts 14 # 16 of the block 10 have their respective edges 18, 20 and these form the arcs # of the circle with the same radius and which form this outer circumference in the finished wheel. In addition, both parts 14 # 16 of one block have their respective edges 22 # 24 # with the same curved contour as the wing 12 from the outer edge 18, 20 to the inner circumference of the wheel, 4 f, 12 3 2 so that they coincide with the wings in two adjacent blocks 10 With 12. The edges 22, 24 of each part, which thus abut the wings, are connected to the side edges of the wings 12 by means of butt or small type welding seams 26, 28. In this way, a uniform, coplanar cover plate with a smooth outer surface on both sides of the wings 12 can be obtained. The second cover plate is formed by the block parts 14 and the second cover plate by the block parts 15. The flow spaces 30 between the two wings 12 are thus delimited on one side by the block part 14 and on the other side by the adjacent block part 16, as best seen in Figure 4.

The individual blocks have an edge 32 at the inner side of the part 16, which follows the arc of a circle, the radius of which is formed by the center of the finished wheel. The arcs of the circle together form a complete circle in which a pole 34 is formed, which is formed of a pipe material and which is welded together with the blocks along their edges 32. On the opposite side, i.e. at the parts 14, a sealing ring 38 is arranged, which is likewise welded together along the arcs 36 of the circle, which together form a complete circle at this side.

The invention is, of course, not limited to the embodiment shown, but can be modified in the broadest sense within the scope of the idea underlying the invention. The profile can be extended, for example, by bending it out at the other outer edge of the impeller block on the back of the impeller.

The number of wings is also not critical to the invention, but can be varied. However, the number of wings is normally 3-9 for practical reasons.

It is also possible to use basically the same structure for non-metallic materials, e.g. plastics. Instead of welding, the base plastic can then be used as a sealant. Thus, although the description of the invention primarily refers to welded parts of metallic material, other materials may be used in the manufacture of the impeller, as mentioned above.

Claims (4)

61 232 5 A pump impeller assembled from interconnected blocks (10) to form two cover plates and vanes (12) arranged around an impeller between them, characterized in that each of the interconnected blocks (10), preferably welded together comprising a vane (12) and a portion (14,16) on each cover plate, these portions (14,16) extending peripherally in opposite directions from the vane (12) to the corresponding nearest vane, so that the second portion is positioned to limit the flow space on the other side of the vane and another part on the other side of the wing. Impeller according to Claim 1, characterized in that the edges (22, 24) of each block extending between the hub and the outer circumference have the same contour as the wings (12) of the adjacent blocks, so that the seams at these edges are arranged at the adjacent blocks. the wing parts. Impeller according to Claims 1 and 2, characterized in that each block (10) has a peripherally inner (32) and a peripherally outer (36) edge which form a continuous circle on each cover plate of the finished impeller. Impeller according to Claim 3, characterized in that a tubular hub (34) is fastened to the inner circular edge of the wheel on the second cover plate and a sealing ring (38) is attached to the outer circular edge of the wheel on the second cover plate.