DE3008672A1 - Centrifugal pump has housing with central inlet - and separate spiral duct with radial outlet fixed inside housing around impeller - Google Patents

Abstract

The pump comprises a housing (1) with central axial inlet (4) and radial outlet (8), a bladed (2) impeller (3) in the housing, and a spiral duct (5) extending around the impeller periphery towards the outlet. This duct is formed as a separate component (6) secured (via 7) within the housing. The outlet (8) may be integral with the component (6). The component (6) may be deep-drawn or cast, or may be formed from a bent conical tube which is partially slotted in longitudinal direction. It may be secured via distance pieces (7) and the space between housing and component may be filled with damping foam material.

Description

Philipp Hilge GmbH
D-650I Bodenheim

Normal-priming centrifugal pump

The invention relates to a non-self-priming radial centrifugal pump of the type specified in claim Λ.

As is known, the efficiency of a radial pump is best when the liquid from the impeller outlet into one spiral housing, which is constantly expanding in its cross-section, is continued to the pressure port. For practical use This puncture dependency has the consequence that a separate housing design for each impeller diameter and each nominal width must be manufactured and stocked with an appropriately designed volute casing. This is particular in the case of pumps made of deep-drawn material with mold costs compared to casting in a ratio of 9: 1, particularly expensive. Conditional The deep-drawing technology means that large numbers of items have to be pressed, which in turn lead to considerable investments in inventory.

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The object of the invention is to considerably reduce the manufacturing costs in radial centrifugal pumps of the specified type.

This object is achieved according to the invention in that in one or more unit housings determined by the nominal width the spiral space not through the housing wall but through a separate one that can be mounted in the pump housing Component is formed.

This formation of the spiral space from a separate component enables a high degree of flexibility in the manufacture of pumps, since this component is a simple matter of the impeller diameter on the one hand and the blade on the other. height can be precisely adjusted with simple manufacturing technology. The previously necessary storage of There is no need for voluminous pump housings of different sizes. Depending on the performance data of the pumps to be manufactured, appropriately selected components can be assembled into a cylindrical pump housing of standard size. This allows from on the performance side, the optimal values of a cast iron pump and, in terms of production technology, all the advantages of a mass-produced pump Pump from z. B. rolling material can be achieved.

The component forming the spiral space can be a molded or tubular part or they can also be made in cast. Especially if, for reasons of surface quality, a Cr-Ni-St pump housing from Peinguß is required, but such a design is opposed to cost reasons, then only that can According to the invention, the component forming the spiral space can be produced from this investment casting material, since this is much less Quantities of material are necessary. A special operational advantage is that the performance of the Pump by replacing the impeller and the volute

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3Q08672

component can also be changed subsequently.

For a fast and easy installation of the volute component in the annular cylindrical pump housing, it is particularly expedient if are provided over the circumference uniformly distributed spacers of corresponding predetermined length - _t ie on the chosen materials - either as separate components or directly can be formed on the outer jacket of the spiral space component.

Good damping properties against vibrations and noise can be achieved by an expedient further development, namely by filling in the free spaces between the respective standard housing and the volute component with a cushioning foam.

In the following, an embodiment of the invention is described in detail with reference to the drawing. Show it:

1 shows a schematic vertical section X-X through a Hadial centrifugal pump;

FIG. 2 shows a schematic horizontal section of the centrifugal pump according to FIG. 1.

The centrifugal pump shown consists of a cylindrical pump housing 1, which is closed on both sides, in which an impeller 3 equipped with blades 2 is rotatably mounted and which has an axial suction port 4 in its central area. In this pump housing Λ , a spiral space 5 is formed with a steadily widening cross section, which is delimited by a spiral-shaped component 6. As can be seen in particular from Fig. 1, this component 6 consists of a longitudinally slotted and around the impeller rotary

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axis as the center bent pipe piece, which is about spacers 7 of appropriate length on the inner jacket of the housing 1 is supported and secured. The spiral space 5 merges into a radially bent pressure connection 8. For vibration and Noise damping can be the gaps between the cylindrical housing 1, the scroll housing 6 and the Spacers 7 with a suitable damping material, e.g. B. a PÜR foam or Styrofoam (registered trademark) be filled out. Since the sizes of the pump housings are standardized, it is special in terms of manufacturing technology easy to clad the spiral space components 6 with the foam material immediately after their production, and to install the prefabricated composite parts in the volute casing. In this way, different sizes can be pre-made Volute spaces can be mounted in the pump housing of a standardized size.

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Claims (1)

Expectations 1. ) Normal-priming centrifugal pump, consisting of a pump housing with an axial suction opening and radial pressure port, a driven impeller mounted in the housing and a spiral chamber in the pump housing, characterized in that the spiral chamber (5) is separated from a separate pump housing ( 1) mountable component (6) is formed. 2. Centrifugal pump according to claim 1, characterized in that that the spiral space (5) forming component (6) together is designed with the pressure port (8). 5. Centrifugal pump according to claim 1 or 2, characterized in that the component (6) forming the spiral space (5) deep-drawn material is pressed. . Centrifugal pump according to claim 1 or 2, characterized in that that the component (6) forming the spiral space (5) is a metal casting. 5. Centrifugal pump according to claim 1 or 2, characterized in that the component (6) forming the spiral space (5) consists of one 535_X_2O78-SdWa 130038/0313 curved, conically widened and partially longitudinally slotted tube. 6. Centrifugal pump according to one of claims 1 to 5 » characterized, that the component (6) forming the spiral space (5) is fastened in the cylindrical pump housing (1) by ^{spacers (7) of different lengths evenly distributed over the circumference.} 7. centrifugal pump according to claim 6,
characterized, that the free space between the pump housing (1) and the component (6) at least partially with a damping Foam is filled. 130038/0313