DE2027978A1 - Centrifugal pump - Google Patents

Description

11 027

A.R. WILPLEY AJO) SONS, INC., Denver, Colorado (U.S.A.)

"Centrifugal pump"

The invention relates to a centrifugal pump with a suction chamber and a housing.

Centrifugal pumps, especially sludge and sewage pumps subject to a high level of material insole. This extremely Great wear and tear is a consequence of secondary or secondary flows and the formation of cavations in the pump Efficiency down. The task is to reduce this wear and tear and to increase the efficiency of the pump.

According to the invention, this object is achieved in that a Cover plate is arranged between the suction chamber and the housing, that an impeller provided with blades rotatable in the housing is held ', and that the cover plate is provided with molded parts which protrude in the direction of the impeller and with which the duroh secondary flow caused in the centrifugal pump

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Material wear can be reduced.

There is preferably an annular projection on the cover plate provided, with which the flow of the pumped liquid from the Aasaugkaoimer to the suction mouth of the impeller can be directed and that The impeller has indentations into which the annular projection engages. ·

It is advantageous to have the cover plate with an annular attachment that surrounds the impeller. The ring-shaped attachment can be provided with a sloping surface, which is at an acute angle to the axis of rotation of the impeller. The annular attachment can have a second sloping one Have a surface which is inclined at an acute angle to the axis of rotation of the impeller, this angle being larger as the angle of inclination of the first sloping surface.

With the centrifugal pump according to the invention, the pumped liquid occurs For example, a liquid paste, Kohlensohlensamtn or thin mortar into the suction chamber through a tube and then flows through the annular outflow canal of the cover plate into the suction mouth of the impeller »The impeller throws the liquid into the volute casing of the pump. By means of this uninterrupted hydraulic operation the fluid to be pumped through the flow opening of the pump housing pushed out.

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With the arranged between the suction chamber and the G.ehause The wear and tear that would otherwise occur on the cover plate is reduced the secondary flow takes place in this type of pump. For this purpose, the annular projection of the cover plate is first provided, which protrudes in the direction of the impeller and which, together with the indentation of the impeller, is similar to a labyrinth seal. This annular projection guides or directs the flow of the delivery liquid into the inlet of the impeller. This current is directed in such a way that the secondary flow of the pumped liquid between the impeller and the cover plate is reduced to a minimum will. '

In addition, the cover plate is provided with the ring-shaped attachment, which also protrudes in the direction of the impeller and surrounds the impeller at its periphery. This essay is with two sloping, circular ring-shaped surfaces, which are at different angles to the axis of rotation of the impeller are inclined. This attachment of the cover plate deflects the pumped liquid into the sneak housing and protects the stressed Parts of the housing and the cover plate in front of the grinding action of the conveyed liquid, which causes the material to slip of the housing is significantly reduced. It turns out that with the two sloping surfaces more different Inclination of the top of the deodorant plate provides optimal protection against Wear and tear is obtained. .

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202797a

The impeller is preferably equipped with blades for pressure relief and the top of the cover plate directs the liquid to be pumped from these blades into the volute. With these Druokentlastungssοhaufein the secondary flow between the impeller and cover plate reduced again.

The gyroscopic or centrifugal inputs according to the invention are exemplified explained in more detail with reference to FIGS. Show it

Fig. 1 Partly in section, the side view of a centrifugal pump according to the invention?

Fig. 2 is an enlarged sectional view through a part the pump of Figure 1;

3 is a section along lines 3-3 of FIG. 2 in FIG. Direction of arrows seen;

Fig. 4 shows the section of another embodiment of a erfindungsgeraassen centrifugal pump.

In the figures, in which the same parts are provided with the same reference characters, a first embodiment is shown in FIG. he centrifugal pump according to the invention is shown in FIGS. There is a base plate 10 provided on a top NaOH stationary support member 12 is placed ₀ holding a horizontally-lying supporting part 14, in which a gebräuohliohe

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Drive shaft 16 is mounted.

An impeller 20 is attached to the front end of the "shaft 16". The impeller 20 is provided with impeller shaft 22 and has a depression or ieitflache 24. In this exemplary embodiment, a closed impeller with a wheel rim is provided. Pressure relief vanes 26 are on the impeller 20 arranged. FIG. 3 shows that the impeller 20 has six pressure relief blades 26.

With these pressure relief blades 26, the secondary flow of the conveyed liquid between the impeller 20 and the cover plate which is described below.

There is a suction chamber 30 is provided, which is not shown Tubes is connected to the delivery liquid. Between the pump housing 32, which has a spiral-shaped outflow space has, and the suction chamber 30 is a cover plate 34 is arranged. Hit plunger bolt 38 the arrangement is shown in the Working position held · The housing 32 has an outlet opening 40. .

It can be seen from FIG. 2 that an annular seal 44 is provided between the suction chamber 30 and the cover plate 34 did. A second annular ring 46 is between the Plate 34 and the adjacent part of the housing 32 arranged.

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The plate 34 has an annular projection 50, which in Direction of the impeller 20 protrudes. The annular projection 50 engages in the guide surface in a manner similar to a labyrinth seal 24 of the impeller 20. With the annular projection 50, the flow of the conveyed liquid into the inlet opening or directed the suction mouth of the impeller 20. In this way, the secondary or secondary flow of the conveyed liquid between the impeller 20 and the plate 34 is reduced to a minimum.

The cover plate 37 also has an annular attachment 54 which protrudes in the direction of the impeller 20 and surrounds the impeller on the outside. This ring-shaped attachment has an annular, inclined surface 56 which is at an acute angle to the axis of rotation of the impeller 20. This inclined surface 56 goes in a kink in a second annular, sloping de surface 58, which is arranged at a larger, acute angle to the axis of rotation of the rotor 20 than the sloping surface 56. It has been shown that with these special Angular ratio for the inclined surfaces 56 and 58 of the annular attachment 54, the material wear is reduced. The annular attachment 54 of the plate 34 deflects the pumped liquid from the pressure relief heap 26 into the spiral housing of the pump and protects stressed parts of the housing 32 from abrasion by the pumped liquid.

II-

Figure 4 shows a modified embodiment of the invention

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according to centrifugal pump; Parts already described have been carried out marked with reference numerals. The cover plate 34 'is designed in the manner already described. Different compared to the embodiment described with reference to FIGS. 1 to 3, the impeller 20 'is not closed, but rather open and pointing therefore no rim and no pressure relief vanes. With the blades 60 of the open impeller 20 '"pressure relief" reached on the adjacent surface of the cover plate 34 '. It should be noted that in this embodiment, the Invention of the annular attachment 54 'of the cover plate 20' the right outer part of the impeller blades 60 surrounds directly, while in the embodiment described in FIGS. 1 to 3, the annular attachment 54 of the cover plate 34 is the pressure relief vanes 26 directly includes.

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Claims (9)

Claims Centrifugal pump with a suction chamber and a housing characterized in that a cover plate (34) is arranged between the Ansaugkanimer (30) and the Gehäuee (32) _r that a bladed (22) wheel (20) rotatably gebalten in the housing iet _y and that the cover plate is provided with molded parts (50, 54) which stop in the direction of the impeller and which reduce the material wear caused by the circulation of life in the centrifugal pump ». 2. Centrifugal pump according to claim H _9, characterized in that an annular projection (50) is provided on the cover plate (34), with which the flow of the conveyed liquid from the Änsaugkaiomer (30) sweet suction mouth of the impeller can be steered. 3 »centrifugal pump according to claim 1 or 2, characterized in that that the impeller (20) is provided with depressions (24) in which the annular projection (50) engages. 4. Centrifugal pump according to one of Claims 1 to 3, characterized in that that the de-icing plate (34) is provided with an annular attachment (54) which surrounds the impeller (34) 1Q9824 / 0987 gives. 5. Centrifugal pump naoh claim. 4 »characterized in that the ring-shaped attachment (54) mijr a sohräg sloping Surface (56) is provided which is at an acute angle to the axis of rotation of the impeller (20). 6 · centrifugal pump according to claim 5 »daduroh characterized in that the annular attachment (54) has a second sloping surface which is at an acute angle to the axis of rotation of the impeller (20) is inclined, this angle being greater than the angle of inclination of the first sohräg sloping Surface (56). 7. centrifugal pump according to one of claims 1 to 6, characterized in that that the impeller (20) with pressure relief so often a (26) is provided. 8. centrifugal pump naoh Anspruoh 7, daduroh characterized that the annular attachment (54) of the Deok plate (34) prints tlastungsaohauf a (26) surrounds. 9. Centrifugal pump naoh one of claims 1 to 6, characterized in that an open impeller (20 ^s ) is provided. 109824/0987