EP3812546A1 - Screw spindle pump - Google Patents

Abstract

Screw spindle pump, comprising a pump housing (2) with a working spindle (3) accommodated therein and at least one running spindle (16) meshing with this, as well as a connection housing (5) placed on the pump housing (2) with a suction connection (27, 32) and a Pressure connection (43) which fluidly communicate with a suction inlet (17) and a pressure outlet (19) of the pump housing (2), wherein the connection housing (5) consists of a first and a second housing part (24, 39), one of which the Suction connection (27, 32) and the other has the pressure connection (43), and both of which are rotatable relative to the pump housing (2) and which are both rotatable relative to one another.

Description

The invention relates to a screw spindle pump, comprising a pump housing with a working spindle received therein and at least one running spindle meshing with it, as well as a connection housing placed on the pump housing with a suction connection and a pressure connection, which communicate fluidically with a suction inlet and a pressure outlet of the pump housing.

Screw pumps are used in a wide variety of areas where primarily liquid media are to be conveyed, for example in the oil and gas industry, chemical or petrochemical chemistry or in the power plant sector, to name just a few areas of application. A screw pump has a pump housing in which at least two spindles are accommodated and rotatably mounted, namely a work spindle that is coupled to a drive motor that is screwed to the pump housing and is driven by this, and at least one running spindle that is connected to the work spindle meshes, it also being possible to provide two running spindles meshing with the one work spindle, usually arranged centrally between them. The pump housing is designed like a cartridge and has a suction inlet, through which the medium to be conveyed is sucked into the pump housing, and a pressure outlet, through which the higher pressure fluid conveyed via the spindles is released.

A connection housing is placed on the pump housing, which means that the cartridge-like pump housing is inserted into the connection housing. The connection housing has corresponding interfaces in the form of a suction connection and a pressure connection, to which the corresponding supply and discharge lines, via which the medium to be conveyed is supplied or discharged, can be connected. The suction connection communicates fluidically with the suction inlet of the pump housing, while the pressure connection communicates fluidically with the pressure outlet of the pump housing. The basic structure and function of such a screw pump is known.

In known screw pumps, there is the possibility of arranging the suction connection and the pressure connection on the connection housing in different positions in order to adapt to the connection situation of the supply and discharge lines, which can be routed to the screw pump in different ways. The suction and pressure connections can be arranged in a line with respect to the longitudinal axis of the screw pump, they can be offset from one another by 90 °, but they can also be offset from one another by 180 °, and finally the suction connection can also be axially or axially displaced. be arranged at the front, while the pressure connection is arranged radially. The multitude of possible arrangements and the fact that each connection housing has to be manufactured individually, depending on the required connection geometry, means that the manufacture of such a screw pump is very complex, since each connection housing is, as it were, an individual production tailored to the application.

The invention is thus based on the problem of specifying a screw pump which is improved in comparison.

To solve this problem, in a screw pump of the type mentioned, the invention provides that the connection housing consists of a first and a second housing part, one of which has the suction connection and the other has the pressure connection, and both of which are rotatable relative to the pump housing and both of them are rotatable relative to each other.

With the screw pump according to the invention, it is particularly advantageous not to use a one-piece connection housing, as was previously the case, but rather a two-part connection housing, consisting of a first and a second housing part, which are arranged axially one behind the other with respect to the longitudinal axis of the pump. The pump housing is cylindrical on the outside in the area in which the two housing parts are placed; in a corresponding manner, the two housing parts are hollow-cylindrical, one housing part being designed as a hollow cylinder, axially open on both sides, which is pushed completely onto the pump housing, while the second housing part is designed quasi-pot-like and has a base, but is equally pushed onto the pump housing. One housing part has the suction connection, the other the pressure connection.

According to the invention, the three housing elements can be rotated twice with respect to one another. On the one hand, both housing parts are rotatably mounted on the pump housing, that is, they can both be rotated relative to the pump housing, which basically makes it possible to rotate the two housing parts around the longitudinal axis of the pump, so that there is the possibility of using the radially arranged suction and pressure connections to be able to change their circumferential or rotational position relative to the pump housing. In addition, the two housing parts can be rotated relative to one another, which means that there is no fixed, unchangeable positioning of the two housing parts with respect to one another, but also variable positioning by rotating around the longitudinal axis of the pump. This makes it possible to bring the radial suction and pressure connections in different positions relative to one another. So it is preferably possible to align the suction and pressure connection along the longitudinal axis of the pump, i.e. linearly one behind the other, whereby both connections, based on the fixed pump housing, can be arranged in a central 0 ° position by rotating them together around the longitudinal axis of the pump, for example, in a + 90 ° position rotated in one direction and a -90 ° position rotated in the other direction, as they can theoretically both be rotated by 180 ° together. In addition, there is the possibility that the suction and pressure connection are not aligned with each other, but instead assume an angle of 90 ° or 180 ° to each other, for which it is only necessary to adjust the two housing parts by the corresponding, desired intermediate angle between the two connections to twist the housing longitudinal axis. Regardless of which position the two housing parts assume relative to the pump housing or to one another, the suction connection of the one housing part with the suction inlet of the is in every position Pump housing fluidly coupled, while the pressure connection of the other housing part is fluidically coupled to the pressure outlet of the pump housing part.

The screw pump according to the invention thus makes it possible, with particular advantage, to manufacture a large number of different screw pumps, which differ in the connection geometry or the position of the suction and pressure connection, using a standardized pump housing and the two likewise standardized housing parts. It is only necessary to push the two housing parts onto the pump housing and bring them into the desired rotational position relative to the pump housing and relative to each other, depending on the required connection geometry, after which it is only necessary to fix the two housing parts to each other, as well as a housing part with the To connect the pump housing so that the components are firmly connected to one another in the desired alignment or geometry. This makes it possible to keep a large number of standardized first and second housing parts, since a large number of different screw pump types can be produced from them using the standardized pump housing. A complex one-off production of a one-piece connection housing, which is only produced for a specific screw pump or a specific screw pump type, as provided in the prior art, is no longer given with particular advantage. Rather, the screw pump according to the invention is a highly flexible, modular system which enables different types of pumps to be produced in an extremely simple manner.

Each housing part can be rotated by at least 45 °, preferably by at least 90 ° and in particular by at least 180 ° relative to the pump housing, but larger angles of rotation of up to 360 ° are also conceivable, which means that ultimately there is no rotation restriction of a housing part relative to the pump housing is.

A suction chamber and a pressure chamber are to be formed within the connection housing towards the pump housing, with the suction connection and the suction inlet located in the suction chamber or leading into them, while the pressure connection and the pressure outlet are located in the pressure chamber or lead into them. In order to design these spaces or to define them sufficiently sealed, a further development of the invention provides for sealing elements to be arranged by means of which the housing parts are sealed against each other and at least one housing part is also sealed against the pump housing. The two housing parts are sealed against one another via at least one first sealing element, since, as described, they can be rotated relative to one another, so that there must be a sealing plane between them. In addition, at least one housing part is also sealed off from the pump housing. On the one hand, this seal creates the separation between the suction chamber and the pressure chamber at the interface between the connection housing and the pump housing, and the connection housing as a whole is sealed relative to the pump housing. This means that there are two sealing planes between the at least one housing part and the pump housing, namely on the one hand the sealing plane between the suction and pressure chamber and on the other hand the sealing plane between the connection housing as such and the pump housing. This is done using two separate sealing elements. Since a housing part is cup-shaped and has an axial end wall or a base, via which the connection housing is closed on this side, there is inevitably no additional sealing plane to be provided there.

In one embodiment of this embodiment of the invention, the housing part having the suction connection is sealed to the housing part having the pressure connection with a first sealing plane, while the housing part having the pressure connection is sealed against the pump housing, two sealing planes being formed here, namely one the suction chamber and the Sealing plane separating the pressure chamber from one another, and the other sealing plane which seals the connection housing and the pump housing from one another.

In order to seal the two housing parts against one another in a simple manner by means of a sealing element, an advantageous development of the invention provides that one of the housing parts has a cylindrical, axially extending flange which engages in an annular fold on the other housing part, the sealing element sealing the two housing parts from one another seals between the flange and the ring fold. The flange and the ring fold therefore interlock axially, so that a radial seal is possible between the two via the sealing element. An axial seal would also be possible here. The sealing elements used are preferably ring seals inserted in corresponding ring receptacles which are formed on the corresponding components. These ring seals or O-rings, which are preferably made of a suitable plastic material, are firmly anchored in the corresponding ring receptacles and rest against the corresponding opposite with sufficient tension so that a defined sealing plane is formed. The ring seals allow a rotation of the housing parts relative to one another as well as of the one housing part relative to the pump housing even in the assembled state, this rotation only taking place once and only by a correspondingly small angular increment until the desired rotational position is assumed, after which the components such as are firmly connected to each other so that no further rotation takes place.

As described, regardless of which rotational position the housing parts assume relative to the pump housing, the suction inlet is fluidically coupled to the suction connection and the pressure outlet is fluidically coupled to the pressure connection in each case. In order to achieve this in a simple manner, in a further development of the invention the suction inlet is provided via one or more radial inlet openings distributed in the circumferential direction on the pump housing, which open into a space formed between the one housing part and the pump housing, and the pressure outlet via one or more in Radial outlet openings which are distributed circumferentially and which are formed on the pump housing and which open into a space formed between the second housing part and the pump housing. Accordingly, there are in each case at least one, but preferably a plurality of radial inlet and outlet openings on the pump housing provided, which open into respective mostly annular spaces, so that a fluidic coupling is given in each case regardless of the rotational position. The inlet and outlet openings can be designed as radial bores, alternatively they can also be designed as larger rectangular and window-like openings. Such a window-like configuration of the inlet openings is conceivable, for example, for forming the suction inlet, wherein such a window-like opening can extend, for example, by approximately 90 ° in the circumferential direction. For example, two such window-like inlet openings offset by 180 ° can then be provided. The outlet openings can be designed, for example, in the form of radial bores, and since these are smaller than the window-like openings, four or six such radial bores can be provided distributed around the circumference of the pump housing. This means that, in principle, the inlet and outlet openings can be of the same type, but they can also be different.

Since the pump housing is axially closed via an axial base on which the two or three spindles are usually hydraulically mounted and supported, to ensure a sufficient inflow cross-section, this terminal base of the pump housing can be provided with further axial inlet openings, which also form the suction inlet together with the radial inlet openings. This means that not only a radial inflow into the pump housing is possible, but also an axial inflow.

As described, the pressure connection is arranged radially, that is to say it extends from the connection housing to the side. The suction connection can also be radial, that is to say it can also run radially to the connection housing or the longitudinal axis of the pump. Here, however, there is also the possibility of additionally providing an axial suction connection, which is thus arranged as an extension of the longitudinal axis of the pump and is formed on the bottom of the terminal, pot-like housing part. This axial suction connection expands the connection spectrum and thus the entire range of pump types that can be produced with the modular system according to the invention. Depending on whether the radial or the axial suction connection is used, the Unused suction connection is tightly closed by a suitable closure element, in particular a closure plug, which closure plug is screwed in a simple manner into a corresponding internal thread formed in the bore that defines the suction connection using a sealing element. Alternatively, a closure plate, that is to say a blind plate for closing the suction connection that is not required, can also be attached, in particular screwed on. If there is such an axial suction connection, the above-described axial inlet openings are preferably formed in the bottom of the pump housing, which are then quasi in an axial extension of the axial suction connection.

As described, the screw spindle pump according to the invention is characterized in that the two housing parts can be rotated relative to the pump housing and also relative to one another. They are then fixed to one another in the desired twisted position. It is conceivable that the housing parts can be fixed to one another and a housing part in its rotational position relative to the pump housing either in excellent rotational positions or in any rotational positions. This means that either predetermined rotational positions can be assumed relative to one another, which are defined via a defined angular division in the circumferential direction, or any, ultimately undefined rotational positions. As a rule, several defined twisting positions are sufficient to capture the desired application-related geometry spectrum, but application scenarios are also conceivable in which, due to local conditions, a twisting angle deviating from a conventional line geometry is to be set.

The fixing of the two housing parts to one another and of the one housing part to the pump housing is preferably carried out by means of screw connections, the screw connections being axially.

According to a first alternative of the invention, the components can be fixed to one another in predetermined rotational positions be that on the terminal housing part a plurality of axial through bores distributed in the circumferential direction and on the adjacent housing part a plurality of axial internal threaded bores distributed with the same pitch in the circumferential direction, and that on a radial flange of the pump housing several axial through bores distributed in the circumferential direction and several with the same on the adjacent housing part Axial internally threaded bores distributed in the circumferential direction are provided. Here, the defined rotational positions are defined via corresponding through and internally threaded bores with the same pitch, that is, the pitch angle is defining for the rotational positions to be assumed. The parts can only be fastened to one another if the corresponding through and internally threaded holes are aligned with one another.

The pitch angle or the pitch of the through and internally threaded bores can be between 15 ° and 90 °, in particular between 22.5 ° and 45 °. Depending on how the angle of division is designed, a smaller or larger possible rotation angle is given, whereby the respective angle of division should always be selected so that in each case the suction and pressure connections are axially aligned with one another or at +/- 90 ° -Arrangement can be positioned to each other in order to be able to form the most common geometries. This is possible, for example, with a pitch angle of 15 °, 22.5 ° and 45 °, whereby these pitch angles also allow 45 ° positions. The smaller the angle of division, the more intermediate positions can be taken.

According to the invention, at least two axially open elongated holes extending in the circumferential direction can be provided on the end housing part and several axially threaded bores distributed in the circumferential direction on the adjacent housing part, and / or on a radial flange of the pump housing at least two axially extending axially open elongated holes and on the adjacent housing part a plurality of axially internally threaded bores distributed in the circumferential direction are provided. In this case, there are corresponding ones on one housing part and on the radial flange on the pump housing side axially open elongated holes extending around the circumference are used, through which the connecting screws are guided, which are supported with their screw heads on the elongated hole edges and are screwed into the corresponding internally threaded bores with a suitable pitch on the middle housing part arranged between the end housing part and the radial flange . Due to the elongated hole arrangement, any rotational positions of the two housing parts with respect to one another as well as of the entire connection housing can be assumed relative to the pump housing. For example, two such elongated holes, each extending around the circumference by approximately 170 °, and for example six internally threaded bores, so that three connecting screws reach through an elongated hole, the internally threaded bore pitch would then be, for example, 60 °.

It is also conceivable to enable the connection of the two housing parts in any desired angle of rotation and the connection of one housing part to the pump housing only in excellent positions, or vice versa. Various connection options are therefore also possible on one pump.

In order to provide a drainage option for the fluid in the pump, which is necessary, for example, in the case of maintenance work, several drainage bores, distributed in the circumferential direction and closed with detachable plugs, leading into the interior of the connection housing are expediently provided on each housing part. These drain holes communicate with the respective annulus of the suction chamber and the pressure chamber. A plurality of drainage bores distributed in the circumferential direction are provided for each housing part in order to ensure that, depending on the rotational position of the respective housing part, one drainage bore is always oriented at least approximately downwards. For each housing part, three drainage bores arranged offset from one another by 90 ° are preferably used, with two drainage bores offset at 90 ° to the suction or pressure connection are arranged, while the third connection hole is diametrically opposite this.

In order to implement a defined housing interface on the connection housing, a flat fastening area with several internally threaded bores for fastening a line to be connected to the suction and pressure connection is expediently formed on both housing parts in the area of the suction and pressure connection. The respective line can be connected directly to this fastening area; the flat fastening area forms a corresponding connection plane which can be sealed off in a simple manner towards the line. The cable is fastened using appropriate connecting screws that are screwed into the internal threaded holes on the fastening area.

This flat fastening area can, however, also serve as an interface for an adapter plate, which the system according to the invention can furthermore include. This adapter plate can be releasably fastened to the fastening area, for which purpose the adapter plate has corresponding through bores through which connecting screws are passed, which are screwed into the internally threaded bores on the fastening area. The adapter plate itself has corresponding fastening devices, in particular internally threaded bores for fastening at least one connection flange plate, which then forms the corresponding connection interface for the line. By interposing this adapter plate, it is possible to provide a connection interface for several different connection flange plates that have different DIN connection interfaces for the line, in order to be able to connect different line types in this way. The adapter plate naturally has a corresponding sealed passage to the respective suction and pressure connection. The term "adapter plate" is to be understood as any adapter element, since on the one hand it can be fixed to the suction and pressure connection or the corresponding fastening area, and that which has the corresponding mounting options for a connection flange plate.

Although it is possible to hang the screw pump in the branch of the line, i.e. to attach it to the inlet and outlet line and to support the screw pump via these lines, it is equally conceivable to do this by means of a foot element. Such a foot element can be attached in a detachable manner, so it can be arranged if necessary. The foot element is preferably fixed on the pump housing, for example on its radial flange.

The foot element can be L-shaped or U-shaped and have a leg with at least two bores provided thereon through which screw connections, via which the pump housing is connected to the adjacent housing part, engage. This means that the foot element is fixed via the connecting screws with which the pump housing and the adjacent housing part are also connected. In the case of an L-shaped foot element, the second leg, which runs parallel to the longitudinal axis of the pump, then rests on the bottom; the pump itself is only supported by the then vertical leg that is fixed to the pump housing. In the case of a U-shaped foot element, one of the lower, resting legs z. B. provided vertically upwardly protruding third leg, which rests on the connection housing and defines a second support plane. This makes it possible to safely support larger, heavier pumps.

Fig. 1

eine Explosionsansicht einer erfindungsgemäßen Schraubenspindelpumpe,

Fig. 2

eine Schnittansicht durch eine erfindungsgemäß Schraubenspindelpumpe,

Fig. 3

eine Aufsicht in Richtung des Pfeils III aus Fig. 2,

Fig. 4

eine Stirnseitenansicht in Richtung der Linie IV in Fig. 2,

Fig. 5 - 16

verschiedene Perspektivansichten unterschiedlicher, aus den in Fig. 1 gezeigten Elementen herstellbarer Schraubenspindelpumpentypen mit jeweils gleicher Positionierung des Pumpengehäuses, jedoch variierender Anordnung der ersten und zweiten Gehäuseteile sowie des Sauganschlusses,

Fig. 17

eine Explosionsansicht einer erfindungsgemäßen Schraubenspindelpumpe einer weiteren Ausführungsform, und

Fig. 18

die zusammengebaute Schraubenspindelpumpe aus Fig. 17.

Further advantages and details of the present invention emerge from the exemplary embodiments described below and on the basis of the drawings. Show:

Fig. 1

an exploded view of a screw pump according to the invention,

Fig. 2

a sectional view through a screw pump according to the invention,

Fig. 3

a plan view in the direction of arrow III Fig. 2 ,

Fig. 4

an end view in the direction of the line IV in Fig. 2 ,

Figures 5-16

different perspective views of different, from the in Fig. 1 Elements shown of manufacturable screw pump types, each with the same positioning of the pump housing, but with a varying arrangement of the first and second housing parts as well as the suction connection,

Fig. 17

an exploded view of a screw pump according to the invention of a further embodiment, and

Fig. 18

the assembled screw pump Fig. 17 .

Fig. 1 shows an exploded view of a screw spindle pump 1 according to the invention. This comprises a pump housing 2 in which a drive spindle 3 (see FIG. Fig. 2 ), which is to be connected via a connecting pin 4 to a drive motor, not shown in detail, to be connected to the pump housing 2, and at least one running spindle 16 meshing with the drive spindle 3 is received. The pump housing 2 has a cylindrical housing section 5 which is delimited axially via a base plate 6 of an end base part 7. This bottom part 7 is connected via corresponding screw connections 8 to a second pump housing part 9 which, in addition to the further part of the cylindrical section 5, has a radial flange 10 and which is also axially limited by an end flange 11 to which the housing of the drive motor is to be attached is. For this purpose, corresponding fastening bores 12 are provided for setting corresponding connecting screws.

In the area between the radial flange 10 and the connection flange 11, trough-shaped depressions 13 are formed, which are used to insert connecting screws 14, with the aid of which a connection housing to be described below is fixed to the pump housing 2.

On the cylindrical section 5 of the pump housing 2, first inlet openings 15 are provided in the area of the base plate 6, two such inlet openings 15 being provided opposite one another. The inlet openings 15 have a quasi-rectangular cross-section and are window-like and extend, for example, around an angular segment of approximately 90 °. In Fig. 1 the spindle 16 can be seen through the inlet opening 15 shown. These inlet openings 15 define a suction inlet 17, which is furthermore formed via axial inlet openings 18 which are formed on the base plate 6. Fluid to be conveyed reaches the working area of the spindles 3, 16 via this suction inlet 17.

Furthermore, several outlet openings 20 in the form of radial bores are formed on the pump housing 2 to form a pressure outlet 19, with four inlet openings 20 offset from one another by 90 ° being provided in the example shown. The pumped fluid emerges from these with the corresponding pressure.

Furthermore, two ring receptacles 21 provided on the cylindrical section 5 are provided, in which, see FIG Fig. 2 , in each case a ring seal 22 is used, which serves to seal the connection housing. Simple O-rings are used as ring seals.

When the pump is assembled, a connection housing 23 is pushed onto the pump housing 2 or the pump housing 2 is pushed with its cylindrical section 5 into the connection housing 23. The connection housing 23 consists of a first housing part 24, which is designed like a pot and has a base 25, as well as a cylindrical cavity 26 in which, see Fig. 2 , the front end of the pump housing 2 engages. The First housing part 24 has a first suction connection 27 in the form of a radial internally threaded bore, which is formed on a flat fastening section 28, which offers a flat fastening interface for a supply line to be connected or an adapter plate to be described below. Four internally threaded bores 29 are formed on the fastening section 28, to which either the line can be screwed or the adapter plate.

Furthermore, a sealing plug 30 with an associated sealing ring 31, which can be optionally set here, is shown. The sealing plug 30 is screwed into the suction connection 27 if it is not needed.

This is the case when the second suction connection 32 formed on the base plate 25 is used, which is also formed in the form of an internally threaded bore and which is also assigned four fastening bores 33 for connecting the supply line or an adapter plate. As present, see Fig. 1 If such an axial connection of an adapter plate is optionally shown, the sealing plug 30 would consequently have to be screwed into the first pressure connection 27. If the adapter plate were to be attached to the first pressure connection 27, the sealing plug 30 would of course have to be screwed into the second pressure connection 32.

Furthermore, the first housing part 24 on the base plate 25 has a plurality of through-bores 34 through which corresponding screw connections are inserted which are used to firmly connect the first housing part 24 to a second, axially adjoining housing part, which is described below .

Furthermore, a total of three drainage bores 36, preferably offset by 90 °, are provided on the first housing part 24, one of which is in Fig. 1 and one in Fig. 2 is shown, and which are each closed by means of a stopper 37 with an associated sealing ring 38. Fluid in the pump can be drained through these drain plugs during maintenance.

A second housing part 39 is also shown, which axially follows the first housing part 24 and, when pushed onto the cylindrical shoulder 5 of the pump housing 2, is arranged between the first connection housing 24 and the radial flange 10. It is designed as a hollow cylinder, so it has a hollow cylindrical inner shape, see Fig. 2 , wherein two radially inwardly projecting annular shoulders 40 are formed on the inner circumference, see Fig. 2 , on which the respective ring seal 22 rests in a sealing manner. In this way, two spaces separate from one another as seen in the axial direction of the pump are formed, namely on the one hand a suction space 41 in the area of the first housing part 24 and the second housing part 39 up to the first annular shoulder 40 and the sealing plane there, with the suction space 41 being the both suction connections 27, 32 open, and a pressure chamber 42 between the second housing part 39 and the pump housing 2 in the area between the two sealing planes formed by the ring seals 22, the pressure connection 43, which is formed on the second housing part 39, opening into this suction chamber, please refer Fig. 2 . The outlet openings 20 also open into this pressure space 42, just as the two inlet openings 15 open into the suction space 41, so that a fluidic connection from the respective suction connection 27, 32 to the pressure connection 43 is provided.

The pressure connection 43 is also formed here on a flat fastening section 44 and is again designed in the form of an internally threaded bore. The flat fastening section 44 in turn serves as a fastening interface for a discharge line or for an adapter plate to be described below. Corresponding internally threaded bores 45 are also provided here for fastening the line or the adapter plate.

The second housing part 39 has three z. B. on drain bores 46 which are arranged distributed by 90 ° and which are closed by means of corresponding sealing plugs 47 with an associated sealing ring 48. Fluid located in the pressure chamber 42 can be drained via this, while fluid located in the suction chamber can be drained via the drain holes 36.

In order to be able to fasten the two housing parts 24, 39 to one another via the connecting screws 35 in the pushed-on state, axially running internally threaded bores 49 are provided on the end face of the second housing part 39, as are the through bores 34. The connecting screws 35 are screwed into this so that the two housing parts 24, 39 are axially screwed tightly to one another. In order to also seal the two against one another, the first housing part 24 has an axially extending annular flange 50, see FIG Fig. 2 which engages in an annular fold 51 on the second housing part 39. A ring seal 53 in the form of an O-ring is received in a ring seat 52 on the ring flange 50, so that the two housing parts 24, 39 are radially sealed off from one another.

How Fig. 1 shows, the through bores 34 and the internally threaded bores 49 are equidistantly offset around the circumference. In the example shown, they have a pitch or a pitch angle of 45 °. This means that the two housing parts 24, 39 can be arranged in different rotational positions relative to one another and can be fixed to one another.

During assembly, the second housing part 39 is first pushed onto the cylindrical section 5, on which the corresponding ring seals 22 are already arranged, until it rests against the radial flange 10. The second housing part 24, on which the ring seal 53 is arranged, is then pushed on. Both housing parts 24, 39 are brought into the desired rotational position relative to one another, as they are also brought together into a desired rotational position relative to the pump housing 2 and the radial flange 10, respectively. If the corresponding twisted positions are assumed, on the one hand the two housing parts 24, 39 are screwed tightly to one another via the connecting screws 35, and on the other hand the entire connection housing 23 is inserted via the connecting screws 14 through corresponding through bores 54 on the radial flange 10 and into corresponding axial internal threaded bores 55 are screwed into the end face of the second housing part 39, fixed. With that there are all three housing parts on the one hand brought into a desired twisted position relative to one another, on the other hand, but also axially firmly screwed together.

As described, there is either the possibility of screwing the respective line directly onto the fastening section 28 or the base 25 or the fastening section 44 at the required suction connection 27 or 32 as well as at the pressure connection 43, for which purpose corresponding connecting screws 56, 57 are used. The corresponding line is sealed by a corresponding ring seal 58, 59 to the corresponding fastening section 28, 44 or to the base 25. In this case, it is directly attached to a standard attachment interface.

In principle, however, it is also possible to screw an adapter plate 60, 61 onto the respective fastening section 28, 44 or the base 25 by means of the connecting screws 56, 57 with the interposition of the ring seals 58, 59. The adapter plates 60, 61 have corresponding through bores 62, 63, which are then penetrated by the corresponding connecting screws 56, 57 which are screwed into the internally threaded bores 29 or 33 or 45. The adapter plates 60, 61 also have four further internally threaded bores 64, 65 in the example shown, which are used to fasten a connection flange plate 66, 67, for which purpose it has corresponding through bores 68, 69, inserted through the corresponding connecting screws 70, 71 and into the internally threaded bores 64, 65 of the adapter plates 60, 61 are screwed. It would also be conceivable to provide through bores instead of the internally threaded bores 64, 65 and to screw the connecting screws 70, 71 into the internally threaded bores 29, 30 and 45, respectively. Here, too, a respective ring seal 72, 73 is interposed, which is formed in a corresponding ring receptacle 74, 75 on the adapter plate 60, 61. This connection flange plate 66, 67 also has internally threaded bores 76, 77 into which connecting screws (not shown in more detail), by means of which the corresponding line is then fastened, are screwed. The arrangement of these Internally threaded bores 76, 77 differ from connection flange plate to connection flange plate, that is to say that different connection flange plates with different hole patterns and thus different standardized connection geometries can be attached.

Furthermore, a foot element 78 is provided, which is L-shaped here and has a vertically extending fastening leg 79 on which corresponding through bores 80 are formed, which are provided by two fastening screws 14, which are used to connect the radial flange 10 to the second housing part 39, be penetrated so that the foot element 78 can be optionally attached to the pump. The foot element 78 rests on the floor via a second horizontally extending leg 81, so that the screw pump 1 is supported by it.

Fig. 2 shows, as described, a sectional view through a screw pump 1 according to the invention, here, unlike in FIG Fig. 1 is shown, the adapter plate 60 is arranged on the suction connection 27, while the suction connection 32 is closed by the stopper 30. Obviously, the suction connection 27, which is of course extended radially outwards via the corresponding bores in the adapter plate 60 and the connection flange plate 66, opens into the suction space 41, which extends up to the first sealing level, realized via the first sealing element in the form of the following axially to the right extends from the ring seal 22. Inflowing or sucked fluid reaches the pump housing 2 via the inlet openings 15 and is guided there via the spindles 3, 16 to the outlet openings 20, where it exits into the surrounding, annular suction chamber 42 and arrives at the pressure connection 43, which of course also has a corresponding Bores in the adapter plate 61 and the connection flange plate 67 is extended to the outside.

As already described, it is possible, on the one hand, to bring the two housing parts 24 and 39 into a variable relative position relative to one another, and also to bring both housing parts 24, 39 into a variable relative position to the pump housing 2. That means that a double twistability given is. This is possible when the pump housing 2 has the cylindrical section 5, while the two housing parts 24, 39 have corresponding inner cylindrical geometries, so that rotation is possible. At the same time, the housing parts are sealed against one another via the corresponding ring seals, these ring seals allowing rotation and nevertheless sealing accordingly in the desired rotation position. The ring seals are not subject to any special requirements resulting from their rotatability, as the housing parts are only rotated once relative to one another during assembly, after which the housing parts or the connection housing are firmly screwed to the pump housing.

Fig. 2 shows, see also the Fig. 3 and 4th , an arrangement in which the two housing parts 24, 39 are arranged axially in alignment with one another with respect to the longitudinal axis of the pump. However, due to the rotatability of the two housing parts 24, 39 relative to one another and relative to the pump housing 2, there are a large number of further possible arrangement or alignment options. These are ultimately only limited by the division of the respective through and internally threaded bores 34, 49 on the two connection housings 24, 39 or 54, 55 on the radial flange 10 and the second connection housing 39 or limited to defined connection positions. It is assumed that the division in both connection levels corresponds to 45 ° in each case.

The Figures 5-16 show a total of twelve arrangement examples of how the suction connections 27 or 32 and the pressure connection 43 can be positioned relative to one another. In all in the Figures 5-16 In the variants shown, the position of the pump housing 2 is the same, only the housing parts 24 and 39 are brought into different positions either only relative to the pump housing 2 or also relative to one another.

The Fig. 5 , 6 and 7 show a linear arrangement of the suction and pressure connections 27, 43, that is, along the longitudinal axis of the pump. While she, starting from Fig. 5 and view of the fastening flange 11 of the pump housing 2, in Fig. 5 are directed to the right, they stand in Fig. 6 quasi vertically upwards, while in Fig. 7 are directed to the left. The housing parts 24, 39 are not rotated relative to one another here, but in different positions which differ by 90 °.

In Fig. 8 the suction connection 27 is directed to the right, while the pressure connection 43 is directed upwards. Both have an angle of 90 ° to one another, that is to say, rotated by two 45 ° divisions, are fastened to one another by means of the connecting screws 35.

When designing according to Fig. 9 If the pressure connection 43 is arranged further rotated by 90 °, so that the suction connection 27 and pressure connection 43 are directed in opposite directions, thus the two housing parts 24, 39 are rotated by 180 ° with respect to one another.

When designing according to Fig. 10 is the suction connection, starting from Fig. 9 , rotated by 90 ° and points vertically upwards, while the pressure connection 43 is still directed to the left. A 90 ° configuration is again provided here.

When designing according to Fig. 11 the suction connection 27 points upwards, while the pressure connection 43 is directed to the right.

When designing according to Fig. 12 the suction connection 27 is rotated by a further 90 ° relative to the pressure connection 43. Both point in opposite directions, the housing parts 24, 39 are therefore rotated by 180 ° with respect to one another. This variant is the mirror-image configuration of the arrangement according to FIG Fig. 9 .

Fig. 13 finally shows an arrangement in which the suction connection 27 is directed to the left, while the pressure connection 43 is again directed upwards, both are at an angle of 90 ° to each other.

All configurations are easily adjustable due to the given 45 ° division with regard to the through and internal thread bores. In principle, other arrangements could also be implemented, resulting from the 45 ° division. This means that the suction and pressure connections 27, 43 can also be arranged at an angle of 45 ° or 135 ° to one another, if necessary.

The Figures 14, 15 and 16 show three arrangement variants in which the axial suction connection 32 is used. While in the embodiments according to Fig. 5-13 the axial suction connection 32 is closed by the stopper 30, is in the configurations according to Figures 14-16 the radial suction connection 27 is closed by means of the sealing plug 30. Here there is the possibility of changing the relative position of the radial pressure connection 43 relative to the axial suction connection 32. While he Fig. 14 is directed to the right, it is behind according to the configuration Fig. 15 vertically upwards. When designing according to Fig. 16 the pressure connection 43 is finally directed to the left.

Here, too, due to the 45 ° division, there is the possibility of bringing the pressure connection 43 into intermediate positions that differ by 45 °.

All of these different pump configurations can be implemented with the same set of pump components. This is because the modular system according to the invention makes it possible, using a standardized pump housing 2 and the use of two standardized housing parts 24, 39, to form these different configurations by simply rotating the components relative to one another. This offers an extremely high degree of flexibility with regard to the pump design with simultaneous simplicity, since only the standardized pump housing 2 with their likewise standardized internal components (spindles, etc.) and standardized first and second housing parts 24, 39 have to be kept.

The Fig. 17 and 18th show, in the form of simplified schematic diagrams, a further embodiment of a screw spindle pump 1 according to the invention, the same reference symbols being used for the same components. For reasons of simplicity, the exploded view is shown here in accordance with Fig. 17 only a reduced number of components shown. In principle, however, the basic structure of this screw pump also corresponds to that described above.

A pump housing 2 and a connection housing 23 comprising a first housing part 24 and a second housing part 39 are also provided here. These are in turn pushed onto the cylindrical section of the pump housing 2 in the manner described above and sealed relative to one another and to the pump housing 2 using appropriate sealing elements. In this embodiment, a radial flange 82 is placed between the two housing parts 24, 39. It has through bores 83 which are aligned with the through bores 34 on the first housing part 24. The connecting screws 35 reach through the through bores 34 and 83 and are also screwed into the corresponding internally threaded bores 49 on the second housing part 39 here.

Furthermore, the radial flange 82 has through bores 84 which are located radially further out and are used to receive connecting screws via which the screw pump 1 can be screwed to a fastening geometry that is not shown in detail.

In this embodiment, a suction pipe 85 is connected to the axial suction inlet 32, which has a fastening flange 86 with through bores 87 through which the connecting screws 56 are guided, which are screwed into the internally threaded bores 33 of the base 25 of the first housing component 24. This of course with the interposition of the ring seal 58, although not shown here in more detail.

The second suction connection 27 is closed here by means of the closure plug 30.

As already described above, an adapter plate 61 is fixed to the fastening section 44 with the pressure connection 43 by means of the fastening screws 57.

This configuration enables the formation of a submersible pump that can be mounted in a tank, either in a horizontal or vertical arrangement.

Claims (23)

Screw spindle pump, comprising a pump housing (2) with a working spindle (3) accommodated therein and at least one running spindle (16) meshing with this, as well as a connection housing (5) placed on the pump housing (2) with a suction connection (27, 32) and a Pressure connection (43) which fluidly communicate with a suction inlet (17) and a pressure outlet (19) of the pump housing (2), characterized in that the connection housing (5) consists of a first and a second housing part (24, 39) of which one has the suction connection (27, 32) and the other has the pressure connection (43), and both of which are rotatable relative to the pump housing (2) and both of which are rotatable relative to one another. Screw spindle pump according to Claim 1, characterized in that each housing part (24, 39) can be rotated through at least 45 ° relative to the pump housing (2). Screw spindle pump according to Claim 2, characterized in that each housing part (24, 39) can be rotated through 360 ° relative to the pump housing (2). Screw pump according to one of the preceding claims, characterized in that sealing elements (22, 53) are provided via which the housing parts (24, 39) are sealed against each other and at least one housing part (39) is also sealed against the pump housing (2). Screw pump according to claim 4, characterized in that the housing part (24) having the suction connection (27, 32) to the housing part (39) having the pressure connection (43) and the housing part (39) having the pressure connection (43) to the pump housing (2) is sealed off. Screw pump according to claim 4 or 5, characterized in that one of the housing parts (24) has a cylindrical, axially extending flange (50) which engages in an annular fold (51) on the other housing part (39), the two housing parts (24 , 39) sealing element (53) sealing one another between the flange (50) and the annular fold (51). Screw pump according to one of Claims 4 to 6, characterized in that ring seals inserted in ring receptacles (21, 52) are provided as sealing elements (22, 53). Screw spindle pump according to one of the preceding claims, characterized in that the suction inlet (17) is formed via one or more radial inlet openings (15) distributed in the circumferential direction on the pump housing (2), which are in one between the one housing part (24) and the pump housing (2 ) open suction chamber (41), and the pressure outlet (19) via one or more radial outlet openings (20) distributed in the circumferential direction on the pump housing (2), which are formed in a between the second housing part (39) and the pump housing (2) Open into pressure chamber (42) is formed. Screw pump according to claim 8, characterized in that at least two inlet and at least four outlet openings (15, 20) are provided. Screw spindle pump according to Claim 8 or 9, characterized in that further axial inlet openings (18) forming the suction inlet (17) are formed on an end base (6) of the pump housing (2). Screw spindle pump according to one of the preceding claims, characterized in that only one housing part (24) on the suction side radial suction connection (27) or a radial and an axial suction connection (27, 32) are provided. Screw spindle pump according to Claim 11, characterized in that, in the case of two suction connections (27, 32), one is closed by means of a detachable closure element, in particular a closure plug (30). Screw spindle pump according to one of the preceding claims, characterized in that the housing parts (24, 39) can be fixed to each other and a housing part (39) can be fixed to each other in its rotational position relative to the pump housing (2) in particular or any rotational positions. Screw spindle pump according to Claim 13, characterized in that screw connections (14, 35) are provided for fixing. Screw spindle pump according to claim 14, characterized in that a plurality of axial through-bores (34) distributed in the circumferential direction and a plurality of axial internal threaded bores (49) distributed with the same pitch in the circumferential direction are provided on the adjacent housing part (39), and / or that on a radial flange (10) of the pump housing (2) a plurality of axial through bores (12) distributed in the circumferential direction and on the adjacent housing part (39) a plurality of axial internal threaded bores (55) distributed with the same pitch in the circumferential direction are provided. Screw spindle pump according to claim 15, characterized in that the through and internally threaded bores (12, 34, 49, 55) have a pitch between 15 ° - 90 °, in particular between 22.5 ° - 45 °. Screw spindle pump according to one of claims 1 to 14, characterized in that at least two on the terminal housing part (24) axially open elongated holes extending in the circumferential direction and on the adjacent housing part (39) a plurality of axially internal threaded bores (49) distributed in the circumferential direction are provided, and / or that at least two axially elongated holes extending in the circumferential direction are provided on a radial flange (10) of the pump housing (2) a plurality of axially internally threaded bores (55) distributed in the circumferential direction are provided on the adjacent housing part (39). Screw pump according to one of the preceding claims, characterized in that on each housing part (24, 39) there are several drainage bores (36, 46) distributed in the circumferential direction and closed with detachable plugs (37, 47) leading into the interior of the connection housing (5) are. Screw spindle pump according to Claim 18, characterized in that for each housing part (2, 39) there are three drainage bores (36, 46) arranged offset from one another by 90 °. Screw spindle pump according to one of the preceding claims, characterized in that on both housing parts (24, 39) in the area of the suction and pressure connection (27, 43) a flat fastening area (28, 44) with several internally threaded bores (29, 45) for fastening one is formed on the suction and pressure port (27, 43) to be connected line. Screw spindle pump according to Claim 20, characterized in that an adapter plate (60, 61) is provided which can be releasably fastened to the fastening area (28, 44) and the fastening devices, in particular internally threaded bores (68, 69), for fastening at least one connection flange plate (66, 67). Screw spindle pump according to one of the preceding claims, characterized in that a foot element (78) which can be detachably attached, preferably to the pump housing (2), is provided. Screw spindle pump according to Claim 22, characterized in that the foot element (78) is L- or U-shaped and has a leg (79) with at least two bores (80) provided thereon through the screw connections (14) via which the pump housing ( 2) is connected to the adjacent housing part (39), grab.

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