JPH0647999B2 - Sheet metal structure spiral wound casing - Google Patents

Abstract

The invention relates to a spiral housing made of sheet steel parts, whose spiral space is designed as a separate component and is fastened between two pump housing parts located on each side of the impeller.

Description

Description: TECHNICAL FIELD The present invention relates to a spiral casing according to the general concept of claim 1.

BACKGROUND ART A spiral casing is often used in a spiral pump having a radial (radial) flow and a mixed flow structure. The spiral casing can be easily manufactured in a large size, but is difficult in the sheet metal structure. Due to the dominant deep-drawing technology in the case of sheet metal construction,
Spiral casings having a radial cross section with a divergent peripheral edge are hardly formable. A solution to this problem is disclosed in DE 2047501. In this method, a casing with a ring chamber that can be easily manufactured is placed after the impeller of a spiral pump. The casing cover arranged on the discharge side has a spiral shape extending in the axial direction. As a result, a spiral chamber that changes in the axial direction is obtained after the assembly is completed. However, this is a compromise solution, the effect of which is far beyond the radially extending spiral shape. It has been found that, especially for a certain higher rotational speed impeller, a pump casing with spirally extending spirals has significantly greater hydraulic advantages.

One alternative solution is German Patent Publication No. 30086
No. 72 publication. In this case, the spiral wound from the tube is inserted into the ring chamber casing, which forms a spiral chamber in the ring chamber casing. A support element connects the spiral chamber to the surrounding liquid-tight ring casing. This structure requires a large amount of material and is expensive to manufacture.

German Utility Model Application No. 1892493 shows a spiral wound casing which consists of two casing halves in a top view with different radii, which are semicircular and which are mounted offset from each other by the difference in their radii. . The edges that abut each other are welded together. A spiral chamber is obtained by correspondingly installing the impeller.

TECHNICAL PROBLEM The object of the invention is to develop a spiral casing which can be manufactured in a simple manner for spiral chambers which are manufactured from components molded without cutting. This problem is solved by the features described in the characterizing part of claim 1.

In the solution according to the invention, the spiral chamber, which is formed as an independent component, has a uniform inner diameter, which allows the spiral chamber to be mounted, for example, on a can or a bell-shaped pump casing and the impeller outlet. It is possible to fix within the area of.
To this end, in an embodiment of the invention, the pump casing is provided with one or more openings in the casing region located opposite the impeller outlet, and the spiral chamber surrounds the openings and is tightly connected to the pump casing. , The spiral chamber is fitted from the outside around the pump casing.

In one alternative embodiment of the invention, the spiral chamber is arranged between and tightly connected to two pump casings on either side of the impeller.

In this case, the pump casing can be shaped as a can or a bell-shaped casing with or without a shaped suction nozzle and can be cut into two parts by cutting in front of or behind the impeller plane. In this case, the cans or bell-shaped casing cutting points facing each other may be
It is possible to connect to the spirally wound chamber side wall extending in the radial direction.

In the embodiments described in claims 5 to 8, the manufacturing of the spiral chamber is targeted. The spiral chamber can be provided around the actual pump casing as a belt-shaped component in one or more parts. The embodiments of claims 9 to 13 relate to the formation of pump casings.

The casing parts on the suction and discharge sides in the region of the spiral chamber are connected to each other by ribs extending in the axial direction. It is also possible to disperse the ribs as separate components over the periphery of the casing and to connect the suction and discharge casing parts to one another. The ribs can also be components of an integral pump casing with suction and discharge side casing parts. However, the ribs can also be intermediate chambers between the punched fluid medium outlet openings. The ribs can also have an angle of attack with the peripheral tangent for better fluid guidance.

Next, the present invention will be described in detail based on embodiments with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are sectional views taken along the longitudinal axis of the spiral casing, FIG. 3 is a sectional view taken along the transverse direction of the rotary shaft of the spiral casing, and FIG. Figures 9-9 are views of various embodiments of the connection of the pump casing in the region of the spiral chamber.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows a spiral chamber in cross section. In the example shown, it comprises a pump casing part 1 on the suction side. A suction nozzle 2 is also formed in the pump casing part 1 at the same time. The suction nozzle 2 is provided with a connecting flange 3 for connection with the conduit. The pump casing part 4 on the discharge side is provided with a bearing support (not shown) and another flange surface 5 for connection with a block motor or the like. The suction-side and discharge-side pump casing parts 1, 4 can each be manufactured as rotationally symmetric deep-drawing parts. It is also easily possible to manufacture the pump casing parts 1 and 4 as an integral deep-drawn part. In this case, the integral deep-drawing part is cut off in the region of the end face 6 for forming the liquid outlet. The second casing part formed thereby, ie the pump casing part 4 on the discharge side, is mounted at a distance from the pump casing part 1 on the suction side, and the connection between both pump casing parts 1, 4 is formed separately. It is carried out in the spiral chamber 7. Both pump casing parts 1, 4 are joined by welding seams 8, 9 around the periphery. The inlet opening 10 into the swirl chamber 7 can thus easily be formed in a corresponding positioning between the pump casing parts 1, 4 relative to each other.

As can be seen from FIGS. 4-9, the inlet opening 10 may consist of a plurality of inlet openings 10. Multiple entrance openings 10
Are distributed around the periphery, and ribs for supporting the structure are formed between them.

The difference between the embodiment shown in FIG. 2 and FIG. 1 lies in that the spiral chamber 7 is arranged between and joined to the two pump casing parts.

FIG. 3 corresponds to a cross section taken along line III-III in FIG. A vortex chamber 7 having a transverse cross-section which varies along the periphery is formed in this embodiment into a strip-shaped component with a divergent U-shaped cross-section, at the ends of which a two nozzle cups of the discharge nozzle 13 component are formed. Is formed. The ends are joined together by welding techniques along the seam 14 of the cup part. The spiral chamber 7 formed in this way can be mounted on the periphery of the pump casing parts 1, 4 on the suction and / or discharge side and fixed by known techniques.
Discharge nozzle 13 having a cross section that spreads like a diffuser
The connection flange 15 can be attached to the connector in a simple manner, see FIG.

FIG. 4 shows the development of the area of the inlet opening in the spiral chamber 7. The inlet opening 10 is between the pump casing parts 1, 4 on the suction and discharge sides. Two pump casings 1, 4
Are connected by ribs 16 bridging the inlet openings 10 and spaced apart from each other. The rib 16 is joined to the pump casings 1 and 4 by welding, but it can be joined by any other known fixing technique.

FIG. 5 shows an embodiment in which the suction and discharge side casing halves 1 and 4 are constituent parts of a single casing. In this case, a throughflow opening 10 for the pumping medium flowing out of the impeller
Are formed by a plurality of rectangular punched openings distributed around the periphery and spaced apart from each other. The ribs 16 left between the openings 10 contribute to strengthening the casing.

Another form of punching through-flow opening 10 is shown in FIG. The through-flow opening 10 is U-shaped. As a result, the tongue-shaped element 17 remains in addition to the rib 16.

As can be seen from the sectional view of FIG. 7, the tongue element 17 can also be lifted. This causes the pumping medium to flow through the opening 10 as a more uniform flow.

Another variant is shown in FIG. In this example the opening 1
The punching contour for 0 is H-shaped. This also makes it possible to form two types of tongue elements 17, 18 with one curved inward and the other curved outward as shown in FIG. In this way the guidance is improved, i.e. a shape similar to a guide wheel can be obtained.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Roviset, Primo Italy, Italy 36100 Vicenza, Via Mentana 22 (72) Inventor Matteazzi, Giuliano Franco Italy, I 36031 Dueville, Via Monte Grappa 10

Claims (12)

[Claims] 1. A sheet metal structure spiral wound casing for a spiral wound pump, comprising a spiral wound chamber formed as an independent component after the impeller, and a pump casing for positioning the spiral wound chamber. A sheet metal structure spiral wound casing, wherein the inner diameter of the chamber (7) corresponds to the outer diameter of the pump casings (1, 4), and the outer diameter of the pump casing (7) is slightly larger than the outer diameter of the impeller. 2. The pump casing (1, 4) is provided with one or more openings (10) in the casing area located opposite the impeller outlet, and the spiral chamber (7). A sheet metal structure spiral casing according to claim 1, characterized in that it surrounds the opening (10) and is tightly connected to the pump casing (1, 4). 3. A sheet metal structure vortex according to claim 1 or 2, characterized in that said spiral chamber (7) is fitted around said pump casing (1, 4) from the outside. Rolled casing. 4. The spiral chamber (7) is arranged between and closely connected to the two pump casings (1, 4) on either side of the impeller. A sheet metal structure spiral wound casing according to claim 1 or 2. 5. The vortex chamber (7) forms a ring element which is separated, the separating plane (14) being located in the region of the discharge nozzle (13). A sheet metal structure spiral wound casing according to any one of claims 1 to 4. 6. A recess according to claim 5, characterized in that recesses for forming the discharge nozzles (13) are provided at both ends (11, 12) of the ring elements located opposite to each other. Sheet metal structure spiral wound casing. 7. Both ends (11, 12) of the ring element.
Is connected to a forming part forming the discharge nozzle (13), the spiral casing having the sheet metal structure according to claim 5 or 6. 8. A plurality of segments, each having a divergent U-shaped cross section and connected to each other, form the spiral chamber (7).
The sheet metal structure spiral wound casing according to any one of items 4 to 4. 9. The pump casing parts (1, 4) on each side of the impeller are connected to each other by ribs (16) distributed over the periphery. The sheet metal structure spiral wound casing according to any one of items 1 to 8. 10. The sheet metal structure spiral wound casing according to claim 9, wherein the ribs (16) are formed as independent components. 11. The openings (10) distributed in the periphery of the pump casing (1, 4) and arranged in the region of the impeller outlet and the spiral chamber (7) are between themselves. The sheet metal structure spiral wound casing according to claim 9, wherein the ribs (16) are formed. 12. Sheet metal structure vortex according to claim 9, characterized in that the ribs (16) have an angle of attack with the tangent of the peripheral edge. Rolled casing.