EP1954948B1 - Pump housing having two-point fastening - Google Patents

Description

The present invention relates to the housing of a pump, in particular a centrifugal pump, with means for mounting the pump to a support surface, a pump chamber in which a conveyor wheel is rotatably mounted, an intake manifold and a suction nozzle to the same pressure port, wherein intake and discharge ports each one Flange and wherein the flanges have a common flange axis.

In the integration of electric motor driven pumps in pipe systems, a fixation of the pump housing to a support surface, such as a wall, a frame or a support profile is necessary. This need is not only because the pump and electric motor without an attachment due to its own weight would heavily burden the pipes connected to the pipe system and the corresponding pipe joints. Rather, it can also come in a centrifugal pump to vibrations, which are passed through the pump housing to the pipe system when the pump housing is not sufficiently static fixed.

For fastening of pump housings, it is known to provide at least three fastening points on the pump housing, with which the pump housing bears against the holding surface and in which fastening means are introduced, via which the pump housing can be fixed to the holding surface. In order to achieve the greatest possible stability, it is customary to arrange the three fastening points in such a way that they form the vertices of a triangle. However, the arrangement of the attachment points is different from pump to pump, so that the Replacement of a pump or the replacement of a pump by another of another type is not possible without high installation costs. For each type of pump, special mounting dimensions and spacings of the attachment points on the support surface are generally necessary.

It is common to arrange the attachment points on the pump chamber of the pump, and due to the fact that the pump chamber differs depending on the capacity of the electromotive pump in size and design, also the spacing of the attachment points depending on the size and performance the pump is. However, it is also known to arrange the attachment points on the neck of a nozzle and / or to arrange an additional attachment point for static stabilization on the pump chamber side facing a flange. The number, location and distance of the attachment points are thus dependent on the design, type, design and size of the pump. Another disadvantage of such pumps with three attachment points, the increased assembly costs in contrast to pumps with only two attachment points.

To form the fastening points according to the prior art, material elevations in the form of cylindrical protruding from the pump chamber pin are arranged on the pump housing. The pins are made of solid material, which requires an unnecessarily high cost of materials. In the pin holes or M10 threaded holes are usually introduced, in which fasteners are used.

Object of the present invention is to provide a pump housing which can be fixed with only two attachment points on a support surface, wherein by dispensing with the conventional pin savings in material is possible and whereby a standardized assembly dimension is established by suitable arrangement of the attachment points, so that Replacement of a pump by another with any pump chamber shape and size is possible easily and with a low monthly cost.

This object is solved by the features of the characterizing part of claim 1.

Electromotive pumps for integration into existing piping systems generally have an intake manifold and a pressure port similar to this, to each of which a flange is cohesively formed. The flanges are used to mount the pump to corresponding mating flanges of the piping system, where they are screwed with them, for example. The flanges have a common flange axis, due to which such pumps are also referred to as "in-line pumps". Such generic pumps are made in one piece from a cast material, for example made of steel or iron. In the following, the pump housing is understood to mean the entirety of the pump, in particular consisting of the pump chamber, the suction and discharge nozzles and their respective associated flanges. Such a pump according to the prior art is in Fig. 1 shown.

From the document EP 0 774 583 A1 a pump is known which has only two attachment points arranged on the pump chamber.

According to the assembly of the integration of a generic pump in an existing pipe system and fixing the pump to a holding surface is achieved in that the pump housing has only two attachment points, which bear against the support surface and fastening means, via which the housing with the support surface can be fixed , Standardized mounting dimensions, in particular within product lines of different types of pumps are inventively achieved in that the attachment points are arranged on the flanges. By normalizing the flange distance, a normalization of the pump attachment can be achieved in this way. Pump flanges are standardized according to DIN-EN 1092 in their dimensions. If there are always equal spacings of the two flanges within a row of pumps, a replacement of a pump is easy and problem-free, since no new attachment points must be provided on the support surface, but rather the attachment points corresponding to the previous pump can be reused. If the spacing between the two flanges is consistently maintained by all the pump types of a manufacturer, the result is one maximum flexibility in the exchange of pumps, in particular due to the independence of the attachment points of the size and shape of the pump chamber and / or the nozzle.

The main advantages of the housing according to the invention with two attachment points, namely the ease of assembly, material reduction and standardization of mounting dimensions, theoretically counteracts the disadvantage that, due to only two attachment points on the flanges, the pump housing together with the electric motor in its direction of movement another degree of freedom receives, which could lead to a static unstable fixation than in a 3-point fixings, which in turn could lead to an increased susceptibility to vibration. This is particularly clear when you imagine the pump housing from above in the direction of the flange axis, wherein the flanges abut against a support surface.

If one thinks of a plane orthogonal to the holding surface in which the flange axis lies, then the pump casing together with the electric motor could move perpendicularly to this plane, i. perform to the sides of the plane. To overcome this disadvantage, which has hitherto prevented the skilled person from using only two fastening points, the contact surfaces provided on the flanges can be made correspondingly wide. Additionally and / or alternatively, a stronger fastener may be used. For example, an M12 threaded hole can be arranged at the attachment point, which is provided with a corresponding fastening means and ensures a better static fixation, than is possible with the use of M10 tapped holes.

In view of the fact that flanges are made substantially round, each flange for forming an attachment point may have at least one flattening directed toward the holding surface or at least one material protrusion directed toward the holding surface. In a preferred embodiment of these holding surfaces, the material projections can have a surface directed towards the holding surface and can be applied to it, which lies within a tangential plane of the outer edge of the corresponding flange. this has the advantage that only a minimum of casting material must be used to produce the holding surface. Alternatively, this surface can also project clearly from the flange edge, so that the surface lies within a plane parallel to the said tangential plane. As a result, the distance of the pump housing from the support surface can be chosen arbitrarily.

In an alternative embodiment variant, the flanges can also have flattenings which each form a surface directed towards the holding surface and can be applied thereto, wherein here too this surface preferably lies within a plane parallel to the tangential plane of the outer edge of the corresponding flange. Alternatively, the surfaces formed by the flats or the projections can also be configured parallel to the holding surface, whereby any angular mounting of the pump housing relative to the support surface are possible.

According to the invention, in each case at least one bore located in the flange plane, in particular a threaded bore, can be introduced into the flanges at the fastening points for respectively receiving a fastening means. The flan plane is understood to be the plane in which the corresponding flange extends or in which the diameter of the corresponding flange lies. The bore can be designed with an internal thread. In an embodiment without internal thread, a fastening means is preferably inserted into the bore and cemented. An advantage of the threaded hole is the lack of cementing a fastener. Rather, a corresponding fastening means with an external thread can be screwed into the threaded bore, via which the pump housing can be fixed to the holding surface. The attachment point can in this case also have several, for example, two holes, with a higher stability of the attachment is achieved in particular in heavy electric motor driven pumps with thick and large flanges.

When using a bore, this may preferably be directed radially to the flange axis, so that a maximum possible static fixation of the pump housing is achieved by this one bore.

Preferably, the holes can be designed as M12 threaded holes and preferably extend between 20 mm and 50 mm, in flats in particular 30 mm deep in the respective flange. As a result, a good grip of the fastener is ensured within the flange.

To increase the stability of the flange fasteners, the flanges may have material extensions on their side facing the pump chamber, which may each extend from the flange axis to the outer edge of the corresponding flange over at least a part of the pump chamber facing side of the corresponding flange, said material extensions each one to the support surface directed surface may have such that this surface together with the surface of the corresponding material projection or the corresponding flattening can be applied to the holding surface form a total contact surface.

To calculate the least possible material costs for these material expansions, they can be convexly curved in the direction parallel to the flange axis to the pump chamber. Furthermore, in a preferred embodiment, this convex curvature of a material extension be designed such that in the overall contact surface geometrically a circle is inscribed, which has a diameter, for example in the range of 15 mm to 35 mm, preferably 25 mm. By such a form of material extensions ensures that the wall thickness between the bore and the corresponding outer surface of the flange to achieve sufficient stability of the attachment is everywhere sufficiently large. This is inventively achieved in particular in that the axis of the bore extends through the center of this inscribed circle of a total contact surface.

To achieve a standardized mounting dimension, the centers of these virtual, inscribed circles can each have a definable distance from the surface of the flanges facing away from the pump chamber or from the surface of the sealing surfaces of the flanges. The sealing surfaces generally form on the side facing away from the pump chamber side of the flanges, concentric elevations, wherein the axis of a bore in the range of 10 mm and 20 mm, preferably in the range of 14 mm and 16 mm from the surface of the corresponding sealing surface may be spaced or spaced in the range of 7 mm and 17 mm, preferably in the range of 11 mm and 13 mm from the surface of the corresponding pump chamber facing away from the side of a flange can. With this definition of the center of the circle in response to a surface of the flange facing away from the pump chamber, the convex curvature of the material extensions can be defined.

The width of the surface can be applied to the holding surface or total contact surface of the flanges with material projections can advantageously be selected depending on the respective size, in particular depending on the respective diameter of a flange. Preferably, however, this width can be between 30 mm and 80 mm, in particular 50 mm.

For a particularly simple manufacture of the pump housing according to the invention, the material projections and the material expansions may be integrally connected to the flanges. Preferably, the material protrusions and the material extensions can be formed directly during the casting process of the pump housing. The pump housing according to the invention is therefore produced in a particularly advantageous embodiment of a casting material, in particular cast iron.

Further advantages and features of the invention are the subclaims and the following detailed description with reference to FIG Figures 1 - 4 refer to.

Fig. 1:

Pumpengehäuse nach dem Stand der Technik mit drei Befestigungsstellen;

Fig. 2:

erfindungsgemäßes Pumpengehäuse mit zwei Befestigungsstellen;

Fig. 3:

perspektivische Ansicht eines erfindungsgemäßen Pumpengehäuses mit abgeflachten Flanschen;

Fig. 4:

Vorderansicht des Pumpengehäuses nach Fig. 3;

Fig. 5:

Draufsicht auf den Flansch des Druckstutzens mit einem Materialvorsprung;

Fig. 6:

Draufsicht auf den Flansch des Druckstutzens mit zwei Materialvorsprüngen;

Fig. 7:

Vorderansicht des Flansches des Saugstutzens mit Gesamtanlagefläche.

Show it:

Fig. 1:

Pump housing according to the prior art with three attachment points;

Fig. 2:

inventive pump housing with two attachment points;

3:

perspective view of a pump housing according to the invention with flattened flanges;

4:

Front view of the pump housing after Fig. 3 ;

Fig. 5:

Top view of the flange of the pressure nozzle with a material projection;

Fig. 6:

Top view of the flange of the pressure nozzle with two material protrusions;

Fig. 7:

Front view of the flange of the suction nozzle with total contact surface.

Fig. 1 shows a pump housing according to the prior art, as already described in the introduction. For the formation of fastening points 17, the pump housing 1 has substantially cylindrical material spigot 18, which tapers conically toward the fastening surface, and a narrow material extension 19, which is arranged on the flange 4a of the pressure port 16. The pins 18 are in this case formed solid and form the hull for receiving a fastening means, not shown. The attachment of such a pump housing 1 can be done for example on a wall.

In Fig. 2 an embodiment of the pump housing 1 according to the invention is shown, wherein both on the flange 4a of the pressure port 16 and on the flange 4b of the suction nozzle 15 each directed towards the holding surface material projection 6 is arranged, which is formed to the holding surface as a flat surface and a corresponding Attachment 3a, 3b forms. In the embodiment according to Fig. 2 the material protrusions 6 are formed such that the flat surface 13 is within a tangential plane of the outer edge of the corresponding flange 4a, 4b. Be on this Fig. 6 referenced, which shows a view of the flange 4a of the pressure port 16 from above, wherein in Fig. 6 is clearly shown that due to the position of the surface 13 within said tangential plane for their formation two material projections 6 are necessary, since there is no protruding flange material at the point of contact of the tangent plane with the outer edge of the flange 4a.

FIG. 2 shows further that the two flanges 4a, 4b each have on their sides directed towards the pump chamber 9 material extensions 10, each extending from the flange 8 to the outer edge of the corresponding flange radially over the pump chamber 9 side facing the corresponding Flange 4a, 4b extend. The material extensions 10 are cohesively on the necks of pressure and suction ports 15, 16 at. The material expansions 10 form a surface 11 directed towards the holding surface, which, like the surface 13 of the material projections 6, is planar and together with the surface 13 of the material projections 6 forms an overall abutment surface 11 + 13. This is schematically in Fig. 7 illustrated. In the Figures 2 and 7 is the convex curvature of the material extensions 10 to the pump chamber 9 toward a direction parallel to the flange 8 direction clearly visible.

An alternative embodiment of the material projections 6 is in Fig. 5 represented, wherein each of a flange 4a associated material projection 6 clearly protrudes from the outer edge of the flange 4a, so that the support surface directed towards the flat surface 13 is within a plane parallel to the tangential plane to the outer edge of the flange 4a.

A second embodiment variant of the pump housing 1 according to the invention is shown in FIG Fig. 3 shown. The attachment points 5a, 5b of the two flanges 4a, 4b are hereby formed by flats, which are each directed to the support surface. By the flats 5a, 5b surfaces 13 are formed in the region of the flange edges to the support surface. Furthermore, these surfaces 13, together with the surface 11 of the material extension 10 likewise formed by the flattening 5a, 5b, form a total contact surface 13 + 11 which can be applied to the holding surface Fig. 3 Furthermore, the electric motor 2 driving the pump is shown in the approach.

Fig. 4 shows the front view of the pump according to the invention according to Fig. 3 , wherein in particular the contact surfaces 13 formed by the flats 5 a, 5 b are recognizable. The convex bulge of the material expansions 10 is in this case designed such that in the contact surface 11 formed by the material extension 10 and in the contact surface 13 formed by the flattening 5a, 5b, a circle 12 having a diameter d can be inscribed in the center of the flattening. This diameter d is in the embodiment according to Fig. 4 25 mm. The axis of the bore 7 extends through the center of this circle 12 of a total contact surface 13 + 11. The convex bulge of Material extensions 10 here is just designed so that a part of the outer circumference of the circle just describes the shape of the surface of the convex curvature. The flats 5a, 5b have a width m, which is dependent on the diameter of the flange. The width m is determined by the distance of the flats 5 a, 5 b from the flange axis 8. For design reasons, the flattening 5a, 5b is symmetrical, so that a flange also has a flattening facing the electric motor 2, see Fig. 3 ,

Even with the use of material projections 6 for forming the attachment points 3a, 3b, the width m of the contact surface 13 is to be selected according to the diameter of the flange ( FIG. 7 ). The width m may have a flange diameter of 140 mm to 150 mm, for example, 50 mm, with a flange diameter of 165 mm to 185 mm, a width m of 60 mm or a flange diameter of 200 mm to 220 mm have a width of m = 70 mm ,

The material extensions 10 have in the embodiment according to Fig. 4 a width n which is preferably 30 mm at a diameter d of the circle 12 of 25 mm. The convex bulge of the material extensions 10 may, as in Fig. 4 represented, also initially jump-shaped from the pump chamber 9 facing side of the flanges 4a, 4b may be formed with a jump height k of, for example, 2 mm, wherein the convex bulge connects to the jump edge.

The center of the circle 12 has a distance X from the surface of the sealing surface 14, which in this case is preferably between 14 mm and 16 mm and can be selected independently of the flange diameter. The pump housing length L depends on the diameter of the flanges and is between 220 mm and 360 mm for flanges between 140 mm and 220 mm.

Claims (14)

1. Housing (1) of a pump, in particular of a centrifugal pump, having means for fastening the pump on a retaining surface, having a pump chamber (9), in which an impeller is mounted in a rotatable manner, having an intake connector (15) and having a delivery connector, which is of identical type to the intake connector (16), wherein the intake and delivery connectors (15, 16) each have a flange (4a, 4b), and wherein the flanges have a common flange axis (8), wherein the housing (1) has just two fastening locations (3a, 3b; 5a, 5b) for fastening the pump on the retaining surface, characterized in that in each case one fastening location (3a, 3b; 5a, 5b) is located on in each case one flange (4a, 4b), and in that each flange (4a, 4b), for forming a fastening location (3a, 3b; 5a, 5b), has at least one flattened portion (5a, 5b) or material protrusion (6) directed towards the retaining surface.
2. Pump housing according to Claim 1, characterized in that the material protrusions (6) each have a surface (13) which is directed towards the retaining surface, and can be positioned against the same, and is located within a tangential plane of the outer periphery of the corresponding flange (4a, 4b) or is located within a plane which is parallel to said tangential plane.
3. Pump housing according to Claim 1, characterized in that the flattened portions (5a, 5b) each have a surface (13) which is directed towards the retaining surface, and can be positioned against the same, and is located within a plane which is parallel to a tangential plane of the outer periphery of the corresponding flange (4a, 4b).
4. Pump housing according to one of the preceding claims, characterized in that the flanges (4a, 4b) have introduced into them, in the region of their fastening locations (3a, 3b; 5a, 5b), in each case at least one bore (7), in particular a threaded bore, which is located in the flange plane and is intended for accommodating a fastening means in each case.
5. Pump housing according to Claim 4, characterized in that the bore (7) is directed in each case radially in relation to the flange axis (8).
6. Pump housing according to Claim 4 or 5, characterized in that the bores are M12 threaded bores and extend to a depth of between 20 mm and 50 mm, preferably 30 mm, into the respective flange (4a, 4b).
7. Pump housing according to one of the preceding claims, characterized in that the flanges (4a, 4b), on their side which is directed towards the pump chamber (9), have material extensions (10), each of which extend from the flange axis (8) to the outer periphery of the corresponding flange (4a, 4b) via at least part of that side of the flange (4a, 4b) which is directed towards the pump chamber (9), wherein the material extensions (10) have a parallel surface (11) directed towards the retaining surface such that said surface (11) together with the surface (13) of the corresponding material protrusion (6) or of the corresponding flattened portion (5a, 5b), it being possible for said surface (13) to be positioned against the retaining surface, forms an overall abutment surface.
8. Pump housing according to Claim 7, characterized in that the material extensions (10) are curved convexly in the direction of the pump chamber (9), parallel to the flange axis (8).
9. Pump housing according to Claim 8, characterized in that the convex curvature of a material extension (10) is configured such that a circle (12) having a diameter ranging from 15 mm to 35 mm, preferably of 25 mm, can be inscribed in the overall abutment surface.
10. Pump housing according to Claim 9, with reference back to Claim 4, 5 or 6, characterized in that the axis of the bore (7) runs through the centre point of the circle (12) inscribed in an overall abutment surface.
11. Housing according to one of Claims 4 to 10, characterized in that the flanges (4a, 4b) each have sealing surfaces (14) which form concentric elevations arranged on that side of the flanges which is directed away from the pump chamber (9), wherein the respective axis of a bore (7) is spaced apart from the top of the corresponding sealing surface (14) by an amount ranging from 10 mm to 20 mm, preferably ranging from 14 mm to 16 mm, or is spaced apart from the top of that corresponding side of a flange (4a, 4b) which is directed away from the pump chamber (9) by an amount ranging from 7 mm to 17 mm, preferably by an amount ranging from 11 mm to 13 mm.
12. Housing according to one of Claims 2 to 11, characterized in that the width of the surface (13), which can be positioned against the retaining surface, or overall abutment surface is selected in dependence on the respective size of the flanges, but is preferably between 30 mm and 80 mm, in particular is 50 mm.
13. Housing according to one of Claims 4 to 10, characterized in that the material protrusions (6) and the material extensions (10) are connected integrally to the flanges (4a, 4b).
14. Housing according to one of the preceding claims, characterized in that the housing (1) is produced from a cast material, in particular from cast iron.

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