BE1031161B1 - Centrifugal pump and method for producing a centrifugal pump - Google Patents

Abstract

The invention relates to a centrifugal pump (1) having a pump housing (2), a motor housing (3) which is placed on the pump housing (2) in any rotational position and defines a longitudinal axis (6), and a plurality of fastening means (9), wherein the motor housing (3) has a ring-like fastening collar (5) at its end facing the pump housing (2), and the fastening collar (5) is fixed in place on the pump housing (2) by the fastening means (9) which are provided at a distance from one another.

Description

' BE2022/6047

Centrifugal pump and method for producing a centrifugal pump

Technical area

The invention relates to a centrifugal pump comprising a pump housing, a

Motor housing mounted on the pump housing and defining a longitudinal axis and a

Plurality of fastening means. The invention further relates to a method for producing a centrifugal pump with the step of placing a motor housing on a pump housing.

Background of the invention

Centrifugal pumps are known from the state of the art and are used to pump a

Fluids are pumped by means of a rotary movement of an impeller provided in a pump housing of the centrifugal pump. The impeller is driven by a motor of the

The motor is typically housed in a motor housing which is mounted on the pump housing and fixed to it by means of four

A terminal box and/or an electronics housing with a control system arranged therein is usually provided for connecting the motor, with the terminal box and/or the electronics housing being placed on the motor housing.

Although the alignment of the motor housing including the terminal box and/or the electronics housing can be adapted to different installation situations using the screws, only four defined

alignments are possible. Furthermore, the motor housing can be rotated including the

It is generally not possible to remove the terminal box and/or the electronics housing when the centrifugal pump is installed without emptying a pipe system connected to the centrifugal pump.

° BE2022/6047

Description of the invention

Based on this situation, it is an object of the present invention to provide a centrifugal pump, in particular a heating circulation pump, and a corresponding method for

Manufacture of a centrifugal pump in which the motor housing can be removed without emptying a pipe system supplied by the centrifugal pump and/or when the centrifugal pump is installed.

The object of the invention is solved by the features of the independent claims.

Advantageous embodiments are specified in the subclaims.

Accordingly, the task is solved by a centrifugal pump comprising a pump housing, a longitudinal axis defining and in any rotational position on the

Pump housing axially mounted motor housing and a plurality of fastening means, wherein the motor housing has a ring-like fastening collar at its end facing the pump housing, and the fastening collar is fixed in place on the pump housing by the fastening means provided at a distance from one another.

An important aspect of the proposed solution is that the motor housing can be fixed to the pump housing in any rotational position. This means that, for example, the motor housing can be rotated in relation to the pump housing during operation without emptying a pipe system connected to the centrifugal pump.

In the solutions known from the state of the art, for example with a motor housing attached with four screws spaced at 90°, the motor housing can only be fixed to the pump housing in four defined orientations and must be completely detached from the pump housing for re-orientation. However, different installation situations often require the motor housing to be aligned in relation to the pump housing, for example due to existing piping, in none of these four predefined orientations. In this respect, the proposed solution is satisfactory.

> BE2022/6047 a long-standing need to obtain a flexible rotational arrangement of the motor housing and to facilitate installation for an installer.

The practical advantage of the proposed solution becomes even more striking when an electronics housing and/or terminal box is placed on the motor housing. Such an electronics housing and/or terminal box is often rigidly connected to the motor housing and its longitudinal extension is often orthogonal to the longitudinal axis of the motor housing. This means that, particularly in cramped installation situations with the previously mentioned existing piping, the arrangement of the electronics housing and/or terminal box often does not allow the desired installation of a conventional centrifugal pump. Due to the rigid connection of the electronics housing and/or terminal box to the electronics housing, the proposed solution also allows the electronics housing and/or terminal box to be rotated into a position suitable for installation and the motor housing including the electronics housing and/or terminal box to be fixed in place in this position.

A centrifugal pump is generally referred to as a fluid machine that

Rotary motion and dynamic forces for conveying mainly liquids as

Fluid is used. In addition to a tangential acceleration of the fluid, also called medium, centrifugal force occurring in radial flow is used for pumping, so that centrifugal pumps are also called centrifugal pumps. In regular operation of the centrifugal pump, the motor housing is preferably arranged above the pump housing and/or is fixed to it. The fluid preferably comprises water or another liquid medium such as a glycol-water mixture. The centrifugal pump is preferably designed as a heating circulation pump.

The pump housing can be designed as known from the prior art, for example with two opposite connections for the piping, whereby

Normals of the connections can extend orthogonally to the longitudinal axis of the motor housing. Preferably, the normals of the connections extend identically so that the

Pump housing is designed as a so-called in-line pump housing. Preferably, in the

An impeller is provided in the pump housing, which is driven by a motor housing

‘ BE2022/6047 motor. A motor shaft can be provided for the motor and the impeller. The design of the motor, the impeller and/or the motor shaft can be as known from the prior art.

The motor housing is preferably open on the side that is placed on the pump housing. It is also possible for the motor housing to be closed in itself and for the motor shaft to protrude from the motor housing into the pump housing. Fixed to the pump housing means in particular that the motor housing cannot rotate relative to the pump housing. Any rotary position means in particular that the

The motor housing can be placed on the pump housing in any rotational position relative to the pump housing and can be fixed in place to the pump housing in this position.

Preferably, a seal is provided between the motor housing and the pump housing, in particular in order to be able to rotate the motor housing when the pipe system is filled with pressure. The seal can be designed as an O-ring and/or inserted into the motor housing and/or the pump housing, for example in a circumferential groove of the end of the motor housing facing the pump housing and/or in a corresponding surface of the pump housing. The seal can also be fixedly connected to the motor housing and/or the pump housing and/or formed on the motor housing and/or the pump housing. The seal can be made of a suitable

Material can be cast and/or injection-molded directly onto a corresponding housing part of the motor housing and/or the pump housing. The motor housing and/or the pump housing can be made of gray cast iron, plastic and/or a composite material.

According to a preferred development, the fastening collar is designed in the form of a disk. The fastening collar preferably extends radially from the axially extending base body of the motor housing, in particular from a jacket surface of the motor housing. The motor housing preferably has a circular, in particular a circular, inner and/or outer diameter. Between the jacket surface and the radially extending fastening collar, a quarter-

> BE2022/6047 circular rounding can be provided as a transition. In the area of the fastening means, recesses extending radially inwards can be incorporated into the rounding to make it easier to install the fastening means. Thickenings extending radially outwards can also be provided in the rounding to improve the stability between the fastening collar and the base body of the motor housing.

According to a further preferred embodiment, the motor housing is designed in a pot-like manner with a radially extending opening and/or the fastening collar extends radially away from the opening, enclosing the opening all the way around. Preferably, the fastening collar has a circular outer circumference in plan view and/or the

Opening is circular. The front surface of the motor housing opposite the opening can be closed or have passages for the motor's connecting cables.

According to another preferred development, the fastening means are designed as screws, in particular as cylinder head screws, which are screwed into the pump housing for stationary fixing. According to another preferred embodiment, the screws have a screw head by which the fastening collar is held axially. The fastening means preferably clamp the fastening collar in the axial direction against the pump housing. The screws can be provided with a flat

top, with a hemispherical top, with a flat-spherical, lens-shaped,

Top side, with a cylindrical edge, a conical edge or another edge as a screw head for axially fixing the fastening collar.

According to another preferred development, the fastening means extend parallel to the longitudinal axis. According to another preferred embodiment, 2, 4, 6, 8 or 10 fastening means are provided, which are arranged in particular at regular intervals from one another, and/or wherein the fastening means radially enclose the fastening collar. It is also conceivable that in the case of a rectangular in axial plan view

Pump housing two fastening devices are provided on each of the four sides of the pump housing. In addition to the prescribed screws, other fastening devices are also

° BE2022/6047 locking means are conceivable which are designed in particular to be detachable for rotating the motor housing.

According to another preferred embodiment, an electronics housing and/or a

Terminal box is provided, which is fixed to the motor housing, in particular at an end of the motor housing facing away from the pump housing. In the

A control and/or electronics for controlling the motor can be provided in the electronics housing. Terminals for connecting the

Motor. Such terminals can also be provided in the electronics housing. The electronics housing and/or the terminal box is preferably separated from the

The motor housing is designed to be closed, with a cable feedthrough being expediently provided between the electronics housing and/or the terminal box and the motor housing. The electronics housing and/or the terminal box can basically have any shape, for example it can be designed like a pot and be arranged in an axial extension of the motor housing. The electronics housing and/or the terminal box can also have a cuboid shape, which can extend in terms of its longitudinal extent, for example orthogonal to the longitudinal axis of the motor housing.

According to a further preferred embodiment, the fastening means press the fastening collar axially onto the pump housing. The fastening means preferably encompass the fastening collar, in particular axially and/or on a radial outer edge of the fastening collar. The axial contact force can be applied by screwing a screw as a fastening means into the pump housing.

According to another preferred development, the centrifugal pump has a fastening disk, wherein the fastening collar is provided axially between the fastening disk and the pump housing and the fastening means fix the fastening disk in place on the pump housing. The fastening disk enables the axial contact pressure applied by the fastening means to be better distributed.

At the same time, a more reliable fastening can be achieved with such a fastening disc. The fastening disc preferably has an opening that allows the motor

7 BE2022/6047 surrounds the door housing radially all the way around. Preferably, the fastening disc rests in contact with the fastening collar, in particular at least on an outer radial edge of the fastening collar.

Further preferably, the fastening disc has a circular opening which leads to a

The outer diameter of the motor housing corresponds particularly in the area of the fastening collar. The fastening disc can have a circular or rectangular outer shape. Preferably, a fastening opening, for example a hole, is made in the fastening disc for each fastening means, through which the

Fastening means is introduced into the pump housing. In the case of a screw as fastening means, the screw head preferably rests axially on the fastening disk in order to fix it relative to the pump housing.

According to a further preferred embodiment, the fastening disk surrounds the motor housing radially all the way around. The fastening disk preferably rests against the motor housing in an axial and/or radial manner, wherein an assembly gap can be provided in the radial direction.

According to another preferred development, the motor housing can be placed on the pump housing so that it can rotate through 360°. This means that the motor housing, when the fastening means are released, can be rotated about its axis in relation to the pump housing and, after such a rotation, can be fixed in place in the new rotational position on the pump housing.

The task is further solved by a method for producing a centrifugal pump with the following steps:

Placing a motor housing defining a longitudinal axis with its ring-like fastening collar in any rotational position axially on a pump housing, fixing the fastening collar in place by means of fastening means provided at a distance from one another on the pump housing.

° BE2022/6047

The fixing preferably includes a possibility for removing the fixing, for example in the form of a screw as a fastening means that can be screwed into the pump housing.

According to a preferred development, the method comprises the step, after setting up:

Rotating the motor housing on the pump housing into a mounting position and

Fixing the mounting collar in the mounting position of the motor housing.

To rotate the motor housing, the fastening means are preferably not completely fixed to the pump housing. In the case of a screw as a fastening means, for example, this means that the screw is loosened but not removed from the pump housing so that the motor housing can be rotated.

According to a preferred development, the method comprises the step, after setting up:

Applying a mounting disc that surrounds the motor housing radially to the mounting collar and

Fix the mounting disc to the pump housing using the fastening materials.

Further advantages and refinements of the method will become apparent to the person skilled in the art in

Analogy to the centrifugal pump described above.

Short description of the drawings

The invention is explained in more detail below with reference to the accompanying drawings using preferred embodiments.

In the drawings show

Fig. 1 shows a centrifugal pump having a pump housing with a motor housing placed on the pump housing in any rotary position in a perspective view according to a preferred embodiment of the invention,

Fig. 2 shows the centrifugal pump of Fig. 1 in a perspective exploded view according to the preferred embodiment of the invention,

Fig.3 the centrifugal pump of Fig. 1 with a mounted on the motor housing

Electronic housing in a perspective view according to the preferred embodiment of the invention,

Fig. 4 the centrifugal pump of Fig. 1 with a mounted on the motor housing

Fastening disc in a perspective view according to the preferred embodiment of the invention,

Fig. 5 shows the centrifugal pump of Fig. 4 in a perspective exploded view according to the preferred embodiment of the invention, and

Fig. 6 the centrifugal pump of Fig. 4 with a mounted on the motor housing

Electronics housing in a sectional view according to the preferred embodiment of the invention.

Detailed description of the implementation examples

Fig. 1 shows a centrifugal pump having a pump housing 2 with a motor housing 3 placed on the pump housing 2 in any rotary position in a perspective view according to a preferred embodiment of the invention.

The pump housing 2 is designed in the manner of an in-line housing with opposite connections 4, wherein in the pump housing 2 a

Impeller for conveying a fluid is arranged. The impeller is driven by means of a

Motor housing 3 provided, not shown in the figures, according to conventional

Type driven. The pump housing 2 and/or the motor housing 3 can be made of gray cast iron, plastic or a composite material.

The motor housing 3 is pot-shaped, forming a longitudinal axis 5, and accordingly has a circular inner and outer diameter. The longitudinal axis 5 of the

Motor housing 3 runs orthogonally to the normal or longitudinal extension of the connections 4. On its end face facing the pump housing 2, the pot-shaped motor housing forms an opening whose surface extends orthogonally to the longitudinal axis 5 of the motor housing 3. The opening is radially enclosed by a ring-like fastening collar 6, which extends all the way around the opening and rests in contact with the motor housing 2. A seal (not shown) is provided between the fastening collar 6 and the motor housing 2.

As can be seen from the exploded view of the centrifugal pump 1 according to Fig. 2, the fastening collar 6 is designed like a disk, with an outer radial edge of the fastening collar 5 extending axially in the direction of the longitudinal axis 5 of the motor housing 3. Accordingly, the fastening collar 6 rests on the motor housing 2 with a radial surface. The fastening collar 6 is designed in one piece with the cup-shaped remainder 7 of the motor housing 3. The circular outer diameter of the cup-shaped remainder 7 increases towards the fastening collar 6, so that in side view a transition 8 from the fastening collar 6 to the cup-shaped remainder 7 is designed like a quarter circle.

The motor housing 3 is fixed to the pump housing 2 by means of four fastening means 9. The fastening means 9 are designed as cylinder head screws or, as shown in the figures, as round head screws with Allen or Phillips recess.

Screws with a flat-spherical and/or lens-shaped top, a hemispherical top, a flat top or other screws with a top or screw head 10 that protrudes radially beyond the thread can be used. The round

ll BE2022/6047 head screws are screwed into the pump housing 2 in the direction of the longitudinal axis 5 in such a way that the screw head 10 axially encloses the fastening collar 6 and presses it axially against the motor housing 3.

In the present case, four fastening means 9 are shown, which are provided at regular intervals, namely at intervals of 90° around the motor housing 3, enclosing it all the way around. Alternatively, for example, 2, 3, 5, 6, 8, 10 or another number of fastening means 9 can be provided, which are preferably arranged at regular intervals. In the area of the fastening means 9, radially extending material recesses 11 and material thickenings 12 are introduced into the transition 8 in alternating fashion.

Because the fastening means 9 or the cylinder head screws with their screw heads 10 press the fastening collar 6 axially onto the motor housing 3, the motor housing 3, which is placed axially onto the pump housing 2, can be fixed in any rotational position. To rotate the motor housing 3 relative to the pump housing 2, the fastening means 9 or the cylinder head screws can be loosened, for example by a few turns, so that the motor housing 3 is still connected to the

Pump housing 2 but not fixed to it in a fixed position. After rotating or turning the motor housing 3 relative to the pump housing 2, the fastening means 9 or the cylinder head screws can be fixed again, for example by

Screw in to reattach the fastening collar 6 to the motor housing 3 so that it cannot rotate axially.

Fig. 3 shows the centrifugal pump 1 of Fig. 1 with an electronics housing 14 placed on the motor housing 3 in extension of the longitudinal axis 5 in a perspective view according to the preferred embodiment of the invention. In this way, in particular with respect to the longitudinal axis 5, the motor housing 3 is provided between the pump housing 2 and the electronics housing 14. In the cuboid-like, with respect to its

Longitudinal extension orthogonal to the longitudinal axis 5 of the motor housing 3 extending

Electronics housing 14 contains electronics and/or controls (not shown) for controlling the motor of the centrifugal pump 1.

Alternatively or additionally, the electronics housing 14 can be designed as a terminal box in which connection terminals are provided for connecting the motor. The

Electronics housing 14 is fixedly connected to the motor housing 3, for example screwed onto the motor housing 3 or locked to it. If the motor housing 3 is rotated relative to the pump housing 2 as described above, the

Electronics housing 14 as well.

Fig. 4 shows the centrifugal pump 1 of Fig. 1 with a

Fastening disk 13 in a perspective view according to the preferred embodiment of the invention. The fastening disk 13, which can be seen better in the perspective exploded view in Fig. 5 of the centrifugal pump 1 according to Fig. 4, is designed like a disk and has a circular opening which corresponds to an outer diameter of the motor housing 3 in the area of the fastening collar 6.

As can be seen from the sectional view of Fig. 6, which shows the centrifugal pump 1 of Fig. 4 with the

As can be seen from the electronics housing 14 mounted on the motor housing 3, the fastening disk 13 projects radially beyond the fastening collar 6 in the area of the circular

Opening, while an outer radial edge has a rectangular shape in plan view, at whose four corners holes 15 are provided for the fastening means 9 or the cylinder head screws.

To assemble the centrifugal pump 1, the motor housing 3 is first placed on the pump housing 2 in any rotational position as before. The fastening disk 13 is then placed axially on the motor housing 3 in such a way that the fastening disk 13 comes to rest on a side of the fastening collar 6 facing away from the pump housing 2. The fastening means 9 or the cylinder head screws are then guided through the holes 15 and screwed to the pump housing 2 in order to fix the motor housing 3 in place on the pump housing 2. The fastening collar 6 is thus provided axially between the fastening disk 13 and the pump housing 2.

To rotate the motor housing 3 relative to the pump housing 2, the fastening means 9 or the cylinder head screws can be loosened but not removed as described above, so that the motor housing 3 can continue to be attached to the pump housing 2 by means of the fastening disk 13.

Pump housing 2 is held. After rotating the motor housing 3 into any rotational position, the fastening means 9 or the cylinder head screws are tightened again in order to fix the motor housing 3 in the new rotational position on the pump housing 2.

The embodiments described are merely examples that can be modified and/or supplemented in many ways within the scope of the claims. Each feature described for a specific embodiment can be used independently or in

Combination with other features in any other embodiment. Any feature that has been described for an embodiment of a certain category can also be used in a corresponding manner in an embodiment of another category.

List of reference symbols

Centrifugal pump 1

Pump housing 2

Engine housing 3

Connection 4

Mounting collar 5

Longitudinal axis 6

Pot-shaped rest 7

Transition 8

Fasteners 9

Screw head 10

Material recess 11

Material thickening 12

Mounting disc 13

Electronic housing 14

Bore 15

Claims (15)

Patent claims 1. Centrifugal pump (1) having a pump housing (2), a motor housing (3) defining a longitudinal axis (6) and axially mounted on the pump housing (2) in any rotational position, and a plurality of fastening means (9), wherein the motor housing (3) has a ring-like fastening collar (5) at its end facing the pump housing (2), and the fastening collar (5) is fixed in place on the pump housing (2) by the fastening means (9) provided at a distance from one another. 2. Centrifugal pump (1) according to the preceding claim, with a seal provided between the motor housing (3) and the pump housing (2). 3. Centrifugal pump (1) according to one of the preceding claims, wherein the fastening collar (5) is designed in a disc-like manner. 4. Centrifugal pump (1) according to one of the preceding claims, wherein the motor housing (3) is designed like a pot with a radially extending opening and the fastening collar (5) extends radially away from the opening, enclosing the opening all the way around. 5. Centrifugal pump (1) according to one of the preceding claims, wherein the fastening means (9) are designed as screws, in particular as cylinder head screws, which are screwed into the pump housing (2) for stationary fixing. 6. Centrifugal pump (1) according to the preceding claim, wherein the screws have a screw head (10) by which the fastening collar (5) is held axially. 7. Centrifugal pump (1) according to one of the preceding claims, wherein the fastening means (9) extend parallel to the longitudinal axis (6). 8. Centrifugal pump (1) according to one of the preceding claims, with 2, 4, 6, 8 or 10 fastening means (9), which are arranged in particular at regular intervals from one another, and/or the fastening means (9) radially enclose the fastening collar (5) and/or the fastening means (9) press the fastening collar (5) axially onto the pump housing (2). 9. Centrifugal pump (1) according to one of the preceding claims, with an electronics housing (14) and/or a terminal box which is arranged in a fixed position on the motor housing, in particular at an end facing away from the pump housing (2). 10. Centrifugal pump (1) according to one of the preceding claims, with a fastening disc (13), wherein the fastening collar (5) is provided axially between the fastening disc and the pump housing (2) and the fastening means (9) fix the fastening disc to the pump housing (2) in a stationary manner. 11. Centrifugal pump (1) according to the preceding claim, wherein the fastening disc (13) surrounds the motor housing (3) radially. 12. Centrifugal pump (1) according to one of the preceding claims, wherein the motor housing (3) can be placed on the pump housing (2) so as to be rotatable through 360°. 13. Method for producing a centrifugal pump (1) with the steps: placing a motor housing (3) defining a longitudinal axis with its ring-like fastening collar (5) in any rotational position axially on a pump housing (2), stationary fixing of the fastening collar (5) by fastening means (9) provided at a distance from one another on the pump housing (2). 14. Method according to the preceding claim, with the step, after the mounting: rotating the motor housing (3) on the pump housing (2) into a fastening position and Fix the mounting collar (5) in the mounting position of the motor housing (3). 15. Method according to one of the two preceding claims, with the step, after the fitting: applying a fastening disk (13) which radially surrounds the motor housing (3) to the fastening collar (5) and fixing the fastening disk (13) by means of the fastening means (9) to the pump housing (2).