Injection-molded housing, core device for producing injection-molded housing, injection-molded tool having such core device, and fluid-conducting device having such injection-molded housing

Abstract

The utility model relates to an injection-molded housing made of plastic and / or a composite material for a fluid-conducting device, in particular for a centrifugal pump, comprising: an inflow connection (3) having an inflow channel (4) for a fluid; an outflow connection (5) having an outflow channel (6); a chamber (2) for the rotatably driven conveying wheel, the chamber having an inflow opening (16) into which the proximal end (41) of the inflow channel opens; and a fastening region (20) extending radially outward substantially perpendicular to a central axis (30) of the chamber, where the inflow joint has a wall (31) defining at least a portion of the proximal end of the inflow channel and at least a portion of the inflow opening, where the wall extends transversely to the central axis, wherein the wall is produced by injection molding with a core (101) extending transversely to the central axis of the chamber. The utility model further relates to a mold core device for manufacturing the injection molding shell, an injection molding tool with the mold core device and a fluid guiding device with the injection molding shell.

Description

TECHNICAL FIELD

[0001] The present utility model relates to an injection-molded housing for a fluid-conducting device, in particular for a centrifugal pump, a core device for producing an injection-molded housing for a fluid-conducting device, in particular for a centrifugal pump, an injection-molding tool having such a core device, and a housing obtained by at least injection molding using such a core device or using such an injection-molding tool. BACKGROUND

[0002] For example, for the production of heating circulation pump units in quantities of several thousand per day, such a housing is required. These units are configured as single-stage inline centrifugal pump units, the pump housing of which, which is bolted to the motor housing, has an inflow connection (suction connection) which comprises an inflow channel; the housing also has an outflow connection (pressure connection) which comprises an outflow channel.

[0003] Such a housing, although of relatively light weight, cannot provide very favorable flow conditions compared to a cast-iron housing. That is to say, when such a housing is used in a fluid-conducting device such as a centrifugal pump, undesirable power losses can occur, thereby reducing the efficiency of the device. A cast-iron housing, although providing more favorable flow conditions, is expensive to produce. SUMMARY

[0004] The object of the present utility model is to provide a housing of the type mentioned at the outset which is simpler to produce and at the same time provides favorable flow conditions, i.e. in particular does not reduce the performance of a fluid-conducting device such as a pump. The object of the present utility model is in particular to provide a housing of the type mentioned at the outset which is simpler to produce and at the same time does not cause or only causes very small power losses, in particular compared to a cast-iron housing.

[0005] The object of the present utility model is achieved by the technical solution according to the present utility model. Preferred refinements will be given in the following.

[0006] According to a first aspect, the present utility model relates to an injection-molded housing made of plastic and / or composite material for a fluid-conducting device, in particular for a centrifugal pump, wherein the housing comprises: an inflow connection having an inflow channel for a fluid, in particular a liquid; an outflow connection having an outflow channel; a chamber for a rotatably driven delivery wheel , wherein the chamber has an inflow opening into which a proximal portion of the inflow channel opens; and a fastening region extending radially outward substantially perpendicular to a central axis of the chamber. The inflow connection has a wall which delimits at least a portion of the proximal portion of the inflow channel and at least a portion of the inflow opening, wherein the wall extends transversely to the central axis. The wall is obtained by injection molding using a core which extends transversely to the central axis of the chamber.

[0007] The technical solution of the utility model can provide favorable flow conditions in the inflow joint, thereby reducing the pressure loss inside the inflow passage. In particular, by the wall extending transversely to the central axis of the chamber, an inflow passage is formed which defines a flow path towards the inflow opening, along which the pressure of the fluid (e.g. liquid) flowing is particularly low. Furthermore, since the wall extends transversely to the central axis, the fluid can flow particularly well from the inflow passage into the chamber via the inflow opening, so that the pressure loss is particularly low even at the transition of the inflow passage to the chamber. In the case of injection molding, the wall extending transversely to the central axis of the chamber also makes manufacturing particularly easy.

[0008] Therefore, the wall is inclined with respect to the central axis of the chamber, not only due to the inclination caused by the casting technique (in order to be able to remove the core from the casting shell later), but also because the core used to cast the wall extends transversely to the central axis of the chamber when the chamber is manufactured. Therefore, in the state in which the shell is at least partially cast, the core is at least partially arranged at the proximal end of the inflow passage (inside or near the shell), more precisely, so that the core extends transversely to the central axis of the chamber. The core can then be removed from the inflow passage simply by pulling along or parallel to the transverse direction (along which the core extends transversely to the central axis of the chamber).

[0009] The core can have a central axis which extends transversely to the central axis of the chamber. The central axis of the core is preferably the central axis of a particularly cylindrical and / or conical section of the core, wherein at least the wall and preferably at least a portion of the inflow opening is cast by (i.e. with or by means of or using) this section. This section of the core preferably has an elliptical cross-section. Therefore, this section of the core can for example form a cylinder having an elliptical base surface. This elliptical cross-section can in particular be configured such that the inflow opening becomes circular by injection molding using the core which extends transversely to the central axis of the chamber. That is, if the core is arranged transversely to the central axis of the chamber and the section is cut perpendicular to the central axis of the chamber, the cross-section of the section thus obtained is preferably circular.

[0010] In a cross-section parallel to the central axis of the chamber, the wall can extend along a straight line transversely to the central axis of the chamber from the inflow opening, in particular from an edge defining the inflow opening. Therefore, the wall can ensure particularly favorable flow conditions in the inflow passage.

[0011] The angle between the central axis of the wall or the proximal portion of the inflow channel and the central axis of the chamber can be in the range of 5° to 50°, preferably 15° to 45°, particularly preferably 25° to 40°, for example 34° to 38°. In one embodiment, the angle is approximately 36°. The central axis of the proximal portion can be, for example, the central axis or the axis of symmetry of a cylindrical and / or conical section or cavity of the proximal portion.

[0012] The inflow channel can have a distal portion (distal from the housing), wherein the angle between the central axis of the distal portion and the central axis of the proximal portion of the inflow channel is obtuse and preferably in the range of 90° to 110°, particularly preferably 95° to 105°. In one embodiment, the angle is approximately 100°. Particularly good flow conditions are provided by this obtuse angle. The central axis of the distal portion can be, for example, the central axis or the axis of symmetry of a cylindrical and / or conical section or cavity of the distal portion.

[0013] In one embodiment, the angle between the axis of the connection (or the central axis of the outflow connection) through which the inflow connection and the outflow connection, respectively, are at least partially arranged and preferably extend and the central axis of the distal portion of the inflow channel can be in the range of 15° to 35°, preferably 20° to 30°, particularly preferably 24° to 28°. In one embodiment, the angle is approximately 26°. The central axis of the outflow channel can be, for example, the central axis or the axis of symmetry of a cylindrical and / or conical section or cavity of the outflow channel, in particular of its distal portion.

[0014] The fastening region can be a flange and / or extend at least partially around the central axis. The fastening region can comprise one or more fastening structures, for example openings, in particular through openings Through the one or more openings, for example, a fastening measure (screw, etc.) can be carried out, respectively. The one or more openings can have a thread. The chamber or the body having the chamber can be connected with a housing part, for example an upper housing part, by means of the fastening region. The housing part can be a housing cover or a further part which defines the chamber, for example from above.

[0015] The inflow connection can have a convex rounding which at least laterally delimits the proximal portion of the inflow channel. Thereby, abrupt or discontinuous transitions of the flow direction at the proximal portion of the inflow channel can be avoided or at least reduced. Particularly good flow conditions are obtained in the inflow channel thereby.

[0016] This convex rounding advantageously also laterally delimits the distal end of the inflow channel. Thereby, a particularly good flow routing from the distal end to the proximal end of the inflow channel can be provided, such that the ends of the inflow channel, although extending transversely to each other, nevertheless largely avoid pressure losses in the fluid flowing from the distal end to the proximal end.

[0017] This convex rounding can depict an arc in a cross-section parallel to the central axis of the chamber, wherein the angle between two tangents which are tangential to the end points of the arc is obtuse and preferably in the range of 90° to 110°, particularly preferably in the range of 95° to 105°. In one embodiment, the angle is approximately 100°. Thus, by this convex rounding a particularly good avoidance of pressure losses in the inflow channel can be achieved.

[0018] According to a second aspect, the utility model relates to a core device for at least partially manufacturing, in particular injection-moulding, an injection-moulded housing for a fluid-conducting device, in particular for a centrifugal pump, wherein the housing comprises: an inflow connection having an inflow channel for a fluid; and a chamber for a rotatably driven delivery wheel, wherein the chamber has an inflow opening into which a proximal end of the inflow channel opens. The core device has: a first core, wherein at least a portion of the chamber can be manufactured by injection moulding using at least the first core; and a second core, wherein at least a portion of the proximal end of the inflow channel and at least a portion of the inflow opening can be manufactured by injection moulding using at least the second core. The second core can be separated from the first core and extends transversely to the first core.

[0019] Thus, the proximal end of the inflow channel and the inflow opening can be easily manufactured, in particular such that pressure losses in the inflow channel are reduced. By this arrangement of the cores, in particular the inflow channel can be injection-moulded, such that sharp angles (less than 90°) in the inflow channel, which can cause a certain degree of pressure loss, are avoided.

[0020] The central axis of the second core can extend transversely to the central axis of the first core. The central axis can be the central axis, preferably the axis of symmetry, of a cylindrical and / or conical section of the first core and / or of the second core.

[0021] The angle between the first core and the second core, preferably the angle between their central axes, can be in the range of 5° to 50°, preferably 15° to 45°, particularly preferably 25° to 40°, for example 34° to 38°. In one embodiment, the angle is approximately 36°.

[0022] The second core can at least partially extend inside the first core. Thus, the cores are arranged relative to each other in a particularly space-saving manner. The first core can have a recess in which at least a portion of the second core is arranged. The second core can be linearly guided through the recess. After the at least one portion of the housing has been cast, the second core can be removed from the first core, and thus from the proximal portion of the inflow channel and from the inflow opening, for example simply by pulling.

[0023] By having the second core extend transversely relative to the first core, it can in particular be achieved that, on the one hand, a flow-technically advantageous configuration of the proximal portion of the inflow channel and the inflow opening can be realized, and, on the other hand, the second core can be easily removed from the finished cast housing, in particular without the cores being destroyed.

[0024] At least a portion of a fastening region of the housing which extends radially outwardly substantially perpendicular to the central axis of the chamber can be produced by injection molding, at least using the first core. Preferably, the first core is configured at least such that it forms a radially inner edge of the fastening region during casting. Alternatively or additionally, the first core can be configured such that one or more (further) regions of the fastening region, for example one or more fastening structures, for example openings and / or outer edges, and / or a radially outer edge of the fastening region can be cast by the first core.

[0025] At least a portion of a helical flow channel of the housing can be produced by injection molding, at least using the first core. The helical flow channel and the inflow opening are preferably formed in the same body. The helical flow channel preferably has a downstream end ( Ende) through which it opens into the outflow channel of the housing. In other words, the downstream end of the flow channel is preferably fluid-technically connected with the outflow fitting, and in particular with its outflow channel. The upstream end of the flow channel is preferably fluid-technically connected with the chamber.

[0026] The core device also has an inflow channel core, wherein at least a portion of the distal portion of the inflow channel can be produced by injection molding, using at least the inflow channel core. The angle between the second core and the inflow channel core, preferably the angle between their central axes, is preferably obtuse, and particularly preferably in the range of 90° to 110°, in particular 95° to 105°. In one embodiment, the angle is approximately 100°. The central axis of the inflow channel core can be the central axis, preferably the axis of symmetry, of a cylindrical and / or conical section of the inflow channel core.

[0027] In the case of at least the use of a core device, in particular of an inflow channel core and / or of a second core, the convex rounding can be produced by injection molding, which at least defines the proximal end of the inflow channel, preferably the distal end of the inflow channel. Thus, the convex rounding can be produced in particular simply, which ensures particularly good flow conditions in the inflow channel core as described above.

[0028] The core device, for example the second core and / or the inflow channel core, can have a reducible, in particular foldable and / or retractable section for the injection molding production of the convex rounding, wherein in the case of at least the use of such a section, the convex rounding can be produced by injection molding. Thus, the convex rounding can be produced in particular cost-effectively. By means of the reducible section, the components of the core device, for example the inflow channel core and / or the second core, can be removed particularly well from the inflow channel produced in the final casting together with the convex rounding. Thus, for example, it is conceivable that in the reduced state of the section, the area of the inflow joint, for example the convex rounding, does not hinder the removal of the inflow channel core and / or the second core. Thus, by means of the reducible section, in particular a complex geometry of the convex rounding can be produced easily, in particular without the use of a sacrificial core.

[0029] The core device can also have an outflow channel core, wherein in the case of at least the use of the outflow channel core, at least a portion of the outflow channel of the housing can be produced by injection molding. The angle between the outflow channel core and the inflow channel core, preferably the angle between their central axes, can be in the range of 15° to 35°, preferably 20° to 30°, particularly preferably 24° to 28°. The central axis of the outflow channel core can be the central axis, preferably the axis of symmetry, of a cylindrical and / or conical section of the outflow channel core.

[0030] The second core can be separated from the first core without damage. Thus, the same core can be used for casting a plurality of housings.

[0031] At least the first core and / or the second core and / or the inflow channel core and / or the outflow channel core can accordingly be a durable core. Thus, in particular the use of a sacrificial core can be dispensed with in the production of the housing. This makes the production particularly economical.

[0032] The injection molding tool, in particular the injection molding mold, can have a core device as described above. The core device is preferably an injection molding core device.

[0033] According to a third aspect, the utility model relates to an injection-molded housing made of plastic and / or composite material for a fluid guiding device, in particular for a centrifugal pump, wherein the housing has: an inflow connection with an inflow channel for a fluid; an outflow connection with an outflow channel; a chamber for a rotatably driven conveying wheel, wherein the chamber has an inflow opening into which a proximal end portion of the inflow channel opens; and a fastening region extending radially outward substantially perpendicular to a central axis of the chamber. Here, the housing is obtained by at least injection molding using a core device as described above or using an injection molding tool as described above.

[0034] The inflow connection can have a wall defining at least a portion of the proximal end portion of the inflow channel and at least a portion of the inflow opening, wherein the wall is injection-molded by the second core of the core device.

[0035] The housing according to the first aspect of the utility model can be obtained by injection molding using a core device as described above or an injection molding tool as described above.

[0036] The housing can be of one piece. That is, the housing can be formed in one piece. This enables the housing to be manufactured particularly cost-effectively.

[0037] Furthermore, the utility model also relates to a fluid guiding device, in particular a centrifugal pump, having a housing as described above. The fluid guiding device also has a rotatably driven conveying wheel, wherein the conveying wheel is arranged at least partially in the chamber of the housing. Furthermore, the conveying wheel is arranged so that it can rotate about the central axis of the chamber. Thus, the central axis of the chamber and the rotational axis of the conveying wheel can be parallel and / or coaxial to each other.

[0038] The present disclosure relates to an injection-molded housing made of plastic and / or composite material for a fluid guiding device, in particular for a centrifugal pump, wherein the housing comprises:

[0039] - an inflow connection with an inflow channel for a fluid,

[0040] - an outflow connection with an outflow channel,

[0041] - a chamber for a rotatably driven conveying wheel, wherein the chamber has an inflow opening into which a proximal end portion of the inflow channel opens, and

[0042] - a fastening region extending radially outward substantially perpendicular to a central axis of the chamber,

[0043] - wherein the inflow connection has a wall defining at least a portion of the proximal end portion of the inflow channel and at least a portion of the inflow opening, wherein the wall extends transversely to the central axis,

[0044] - wherein the wall is obtained by injection molding using a core which extends transversely to the central axis of the chamber.

[0045] In some embodiments, the core has a central axis which extends transversely to the central axis of the chamber.

[0046] In some embodiments, the central axis of the core is the central axis of a section of the core which is in particular cylindrical and / or conical, wherein at least the wall and preferably at least a portion of the inflow opening is injection molded through the section, wherein the section of the core preferably has an elliptical cross section.

[0047] In some embodiments, in a cross section parallel to the central axis of the chamber, the wall extends along a straight line transversely to the central axis of the chamber starting from the inflow opening, in particular from an edge defining the inflow opening.

[0048] In some embodiments, the angle between the central axis of the wall or of the proximal portion of the inflow channel and the central axis of the chamber is in the range of 5° to 50°.

[0049] In some embodiments, the angle between the central axis of the wall or of the proximal portion of the inflow channel and the central axis of the chamber is in the range of 15° to 45°, preferably in the range of 25° to 40°, particularly preferably in the range of 34° to 38°.

[0050] In some embodiments, the inflow channel has a distal portion, and wherein the angle between the central axis of the distal portion and the central axis of the wall or of the proximal portion of the inflow channel is an obtuse angle and preferably in the range of 90° to 110°, particularly preferably in the range of 95° to 105°.

[0051] In some embodiments, the angle between the axis of the connection piece through which the inflow connector and the outflow connector are each at least partially arranged and preferably extend and the central axis of the distal portion of the inflow channel is in the range of 15° to 35°, preferably in the range of 20° to 30°, particularly preferably in the range of 24° to 28°.

[0052] In some embodiments, the fastening region is a flange.

[0053] In some embodiments, the fastening region extends at least partially around the central axis of the chamber.

[0054] In some embodiments, the inflow joint has a convex rounding which at least laterally delimits the proximal end of the inflow channel and preferably laterally delimits the distal end of the inflow channel.

[0055] In some embodiments, the convex rounding depicts an arc in a cross-section parallel to the central axis of the chamber, wherein the angle between two tangents which are tangential to the end points of the arc is obtuse and preferably in the range of 90° to 110°, particularly preferably in the range of 95° to 105°.

[0056] The present disclosure also relates to a core device for at least partially manufacturing an injection-molded housing for a fluid guiding device, in particular for a centrifugal pump, the housing comprising an inflow joint having an inflow channel for a fluid and a chamber for a rotatably drivable transport wheel, wherein the chamber has an inflow opening into which a proximal end of the inflow channel opens, wherein the core device has:

[0057] - a first core, wherein at least a portion of the chamber can be manufactured by injection molding in the case of using at least the first core, and

[0058] - a second core, wherein at least a portion of the proximal end of the inflow channel and at least a portion of the inflow opening can be manufactured by injection molding in the case of using at least the second core,

[0059] - wherein the second core can be separated from the first core and extends transversely with respect to the first core.

[0060] In some embodiments, the central axis of the second core extends transversely to the central axis of the first core.

[0061] In some embodiments, the angle between the first core and the second core, preferably the angle between their central axes, is in the range of 5° to 50°, preferably in the range of 15° to 45°, particularly preferably in the range of 25° to 40°, for example in the range of 34° to 38°.

[0062] In some embodiments, the second core extends at least partially inside the first core.

[0063] In some embodiments, the first core has a recess in which at least a portion of the second core is arranged.

[0064] In some embodiments, at least a portion of a fastening region of the housing can be manufactured by injection molding in the case of using at least the first core, the fastening region extending radially outward substantially perpendicular to the central axis of the chamber.

[0065] In some embodiments, at least a portion of the helical flow channel of the housing is producible by injection molding using at least the first core.

[0066] In some embodiments, the helical flow channel opens with its downstream end into the outflow channel of the housing.

[0067] In some embodiments, the core device further has an inflow channel core, wherein at least a portion of the distal end of the inflow channel is producible by injection molding using at least the inflow channel core.

[0068] In some embodiments, the angle between the second core and the inflow channel core is obtuse and preferably in the range of 90° to 110°, particularly preferably in the range of 95° to 105°.

[0069] In some embodiments, the convex fillet is producible by injection molding using at least the core device, for example the second core and / or the inflow channel core, which at least defines the proximal end of the inflow channel and preferably defines the distal end of the inflow channel.

[0070] In some embodiments, the core device, for example the second core and / or the inflow channel core, has a collapsible, in particular foldable and / or retractable, section, wherein the convex fillet is producible by injection molding using at least this section.

[0071] In some embodiments, the core device further has an outflow channel core, wherein at least a portion of the outflow channel of the housing is producible by injection molding using at least the outflow channel core.

[0072] In some embodiments, the angle between the outflow channel core and the inflow channel core is in the range of 15° to 35°, preferably in the range of 20° to 30°, particularly preferably in the range of 24° to 28°.

[0073] In some embodiments, at least the first core and / or the second core is a permanent core, respectively.

[0074] The present disclosure further proposes an injection molding tool, in particular an injection molding mold, having the aforementioned core device.

[0075] The present disclosure further proposes an injection-molded housing made of plastic and / or composite material for a fluid guiding device, in particular for a centrifugal pump, wherein the housing comprises:

[0076] - an inflow connection having an inflow channel for a fluid,

[0077] - an outflow connection having an outflow channel,

[0078] - a chamber for a rotatably drivable transport wheel, wherein the chamber has an inflow opening into which a proximal end portion of the inflow channel opens, and

[0079] - a fastening region which extends radially outwards substantially perpendicular to the central axis of the chamber,

[0080] wherein the housing is obtained by at least injection molding using the aforementioned core device or using the aforementioned injection molding tool.

[0081] In some embodiments, the inflow joint has a wall which defines at least a portion of the proximal end portion of the inflow channel and at least a portion of the inflow opening, wherein the wall is injection molded by means of the second core.

[0082] In some embodiments, the housing is obtained by injection molding using the aforementioned core device or using the aforementioned injection molding tool.

[0083] In some embodiments, the housing is configured in one piece.

[0084] The present disclosure also relates to a fluid guiding device, in particular a centrifugal pump, having a housing according to one of the aforementioned embodiments, a rotatably drivable transport wheel, wherein the transport wheel is arranged at least partially in the chamber of the housing and is rotatable about the central axis of the chamber. BRIEF DESCRIPTION OF DRAWINGS

[0085] The utility model will be explained in detail below with the aid of the embodiments shown in the drawings. Therein:

[0086] Figure 1 a front view of an embodiment is shown,

[0087] Figure 2 a side view (from the Figure 1 left side), more precisely viewed from the distal end portion of the inflow joint,

[0088] Figure 3 a top view (plan view) of an embodiment is shown,

[0089] Figure 4 an axial cross section (cross section parallel to the central axis of the chamber) of an embodiment along Figure 3 line IV-IV in the drawing,

[0090] Figure 5 a schematic side view of an embodiment of a core device for injection molding an embodiment is shown,

[0091] Figure 6 a diagram is shown in which the pump characteristics of a pump having a housing according to the utility model are compared with the pump characteristics of a pump having an iron cast housing. DETAILED DESCRIPTION

[0092] The housing, which is exemplarily shown in the drawing, is for a fluid guiding device, in particular for an inline fluid guiding device. The fluid guiding device can be for example a centrifugal pump or another fluid guiding device, such as a valve or a fitting. The housing has a main body 1 in which a chamber 2 is provided for a rotatably driven delivery wheel (not shown). The rotatably driven delivery wheel can be for example a pump impeller.

[0093] The housing further has an inflow connection 3 with an inflow channel 4. The housing further has an outflow connection 5 with an outflow channel 6. The inflow connection 3 can have a connection piece 7 by which the inflow connection 3 can be connected to an input pipe. The connection piece 7 can have a threaded interface and / or a fastening flange. The outflow connection 5 can have a connection piece 8 by which the outflow connection 5 can be connected to an output pipe. The connection piece 8 can have a threaded interface and / or a fastening flange. The input pipe and the output pipe can have a common axis and / or be arranged coaxially. Preferably, the input pipe and the output pipe are arranged at the same height. Correspondingly, only one inflow connection and one outflow connection are shown, but in any case a plurality of connection pipes, for example two or more inflow connections 3 and / or two or more outflow connections 5 can be provided.

[0094] In particular, it can be clearly seen in Figure 4 that the inflow channel 4 has a proximal end 41 (i.e. inside or near the housing) and a distal end 42 (i.e. outside or away from the housing). If fluid flows through the housing during operation of the fluid guiding device, the proximal end 41 is the downstream end and the distal end 42 is the upstream end. The chamber 2 further has an inflow opening 16, which is for example formed in the main body 1. The proximal end 41 of the inflow channel 4 opens into the inflow opening 16.

[0095] In particular, it can be clearly seen in Figure 3 that the housing has a fastening region 20, which is for example a flange. The fastening region 20 can be formed in the main body 1. By means of the fastening region 20, the chamber 2 and thus the housing part with the chamber 2, for example the lower part, for example the main body 1, can be connected with another part, for example the upper part, in particular another part of the housing. For example a motor for driving the delivery wheel can be fastened on the fastening region 20. The fastening region 20 can have one or more fastening structures 21, for example one or more openings, preferably configured or not configured with threads.

[0096] The fastening region 20 extends substantially radially outwardly perpendicular to a central axis 30 of the chamber 2. The central axis 30 of the chamber 2 extends here through the inflow opening 16. The central axis 30 of the chamber 2 can be a (common) axis along which the connections 7, 8 are arranged. The central axis 30 of the chamber 2 is preferably an axis parallel and / or coaxial to an axis of rotation about which the transport wheel can be rotated when the transport wheel is at least partially arranged in the chamber 2. In other words, the transport wheel can be arranged so as to be rotatable about the central axis 30 of the chamber 2 when the transport wheel is at least partially arranged in the chamber 2. For example, the fastening region 20 has a flat region, perpendicular to which the central axis 30 of the chamber 2 extends.

[0097] The fastening region 20 can extend at least partially around the central axis 30 of the chamber 2. The fastening region 20 can have a radially inner edge 22. This edge 22 preferably delimits an opening 23 of the chamber 2, through which the transport wheel can preferably be arranged in the chamber 2 (i.e. placed, arranged in the chamber, etc.). The opening 23 is preferably opposite and / or preferably larger than the inflow opening 16. Preferably, the central axis 30 of the chamber 2 extends through the opening 23 and the inflow opening 16. The openings 16, 23 can be arranged dispersedly along the central axis 30 of the chamber 2. The edge 22 can extend along an arc lying in a plane, wherein the central axis 30 of the chamber 2 is preferably perpendicular to this plane. Preferably, if the edge 22 has a radius, the center point of this radius lies on the central axis 30 of the chamber 2.

[0098] It can be clearly seen in particular in Figure 4 that the inflow connection 3 has a wall 31 which on the one hand delimits at least a portion of the proximal portion 41 of the inflow channel 4 and on the other hand delimits at least a portion of the inflow opening 16. This means that the (free or distal) end of the wall 31 delimits at least partially the inflow opening 16. In particular, the end of the wall 31 can form an edge delimiting the inflow opening 16. The corner 17 can have or form this edge. The corner 17 is preferably obtuse. The housing can have a bottom 18 which preferably (from below) delimits the chamber 2, wherein the corner 17 is a portion of the bottom 18 (i.e. is at least partially delimited by the bottom 18) and / or is a portion of a protrusion (e.g. in particular an annular flange, in particular a Stehkragen) extending from the bottom 18.

[0099] The wall 31 is arranged so as to extend transversely, in particular obliquely, to the central axis 30 of the chamber 2. Thereby a flow path is created which is formed at least by the proximal portion 41 and the distal portion 42, which leads to a particularly low pressure loss. In other words, by the obliquity of the wall 31 with respect to the central axis 30 of the chamber 2, the pressure energy loss caused by the inflow channel 4 is reduced. Preferably, in a cross section parallel to the central axis 30 of the chamber 2, as Figure 4As shown, the wall 31 extends from the inflow opening 16 , ie from the edge that delimits or defines the inlet 16 , along (or parallel to) a straight line that is transverse to the central axis 30 of the chamber 2 .

[0100] Thus, there is an angle between the wall 31 and the central axis 30 of the chamber 2. This angle is determined to be greater than the angle obtained when the wall is substantially parallel to the central axis 30 of the chamber 2 and is only inclined (minimally) due to the casting technology taper, so that the cores required to cast such a wall (by injection molding) can be easily removed from the housing.

[0101] like Figure 4 As shown, the angle between the wall 31 and the central axis 30 of the chamber 2 can be, for example, 36°. However, the present invention is not limited to this angle. The angle can also take other values, in particular, a value in the range of 5° to 50°, preferably 15° to 45°, particularly preferably 25° to 40°, for example 34° to 38°.

[0102] The wall 31 preferably defines the proximal end 41 of the inflow channel 4 so that the proximal end 41 has a central axis 41. This means that the flow path defined by the proximal end 41 and / or the wall 31 preferably extends at least partially parallel to the central axis 41.1 of the proximal end 41. The wall 31 may, for example, have an arcuate shape in a cross section transverse to the central axis 41.1 of the proximal end 41. The arcuate shape may have a center point that is located on the central axis 41.1 of the proximal end 41. In a cross section parallel to a plane defined by the central axis 30 of the chamber 2 and the central axis 41.1 of the proximal end 41, the wall 31 may extend parallel to the central axis 41.1 of the proximal end 41. As Figure 4 As shown, the angle between the center axis 41.1 of the proximal end 41 and the center axis 30 of the chamber 2 is, for example, 36°. The angle between the center axis 30 of the chamber 2 and the center axis 41.1 of the proximal end 41 can also have other values, in particular values ​​in the range of 5° to 50°, preferably 15° to 45°, particularly preferably 25° to 40°, for example 34° to 38°.

[0103] Due to the wall 31 extending transversely or obliquely to the central axis 30 of the chamber 2, a structure of the inflow channel 4 is obtained, whose distal portion 42 extends flow-technically advantageously with respect to the proximal portion 41. The distal portion 42 has a central axis 42.1. The central axis 42.1 of the distal portion 42 can for example form the central axis and / or the axis of symmetry of a cylindrical and / or conical section of the distal portion 42 of the inflow channel 4. In other words, the inflow connector 3 preferably has a further wall 32 which defines a cylindrical and / or conical cavity at least partially forming the distal portion 42, wherein the central axis 42.1 of the distal portion 42 extends through and / or forms the central axis (for example the axis of symmetry) of this cavity. Alternatively or additionally, the central axis 42.1 of the distal portion 42 can extend parallel to the flow path formed by the distal portion 42 of the inflow channel 4.

[0104] Due to the obliqueness of the wall 31 with respect to the central axis 30 of the chamber 2, an angle between the central axis 41.1 of the proximal portion 41 and the central axis 42.1 of the distal portion 42 is produced, such that a flow path is formed through the inflow channel 4 along which the pressure loss is particularly low. As Figure 4 exemplarily shown in Fig. 2, the angle between the central axis 41.1 of the proximal portion 41 and the central axis 42.1 of the distal portion 42 can for example be 100°. The angle between the central axis 30 of the chamber 2 and the central axis 41.1 of the proximal portion 41 can also be obtuse, for example in the range of 90° to 110°, preferably in the range of 95° to 105°.

[0105] The outflow channel 6, in particular the distal portion 61 (outside or remote from the housing) of the outflow channel 6, can have a central axis 61.1. The axis 61.1 of the distal portion 61 of the outflow channel 6 is preferably parallel to the outflow direction in which the fluid is conducted out of the outflow channel 6. The central axis 61.1 of the distal portion 61 of the outflow channel 6 is preferably parallel to the flow path defined by the outflow channel 6. The connection piece 8 extends radially outward, for example substantially perpendicular to the central axis 61.1 of the distal portion 61 of the outflow channel 6. The central axis 61.1 of the distal portion 61 of the outflow channel 6 can extend substantially perpendicularly to the central axis 30 of the chamber 2. As Figure 4 exemplarily shown in Fig. 2, the distal portion 42 of the inflow channel 4 and at least a portion of the outflow channel 6, for example the distal portion 61 thereof, can be arranged oppositely such that their central axes 42.1, 61.1 are oblique with respect to each other, for example such that the angle between the central axis 42.1 of the distal portion 42 and the central axis 61.1 of the distal portion 61 of the outflow channel 6 is in the range of 15° to 35°, preferably 20° to 30°, particularly preferably 24° to 28°, or for example 26° as exemplarily shown in Fig. 2. Figure 4

[0106] ​In order to further optimize the inflow channel 4 from a flow perspective, the inflow connection 3 can have a convex radius 33. The convex radius 33 is designed to laterally delimit the proximal end 41 of the inflow channel 4 and preferably also laterally delimit the distal end 42 of the inflow channel 4. The convex radius 33 can be seen in particular in a section parallel to the central axis 30 of the chamber 2, as shown in FIG. Figure 4 As shown in . By means of the convex radius 33, it is possible to optimize, for example, the transition from the distal end 42 of the inflow channel 4 to the proximal end 41 of the channel 4, so that in particular there are no sharp corners or the like in the direction of the flow path defined at least by the ends 41, 42. This allows the pressure loss in the inflow channel 4 to be further reduced.

[0107] In a cross section parallel to the central axis 30 of the chamber 2, for example Figure 4 As shown, according to one embodiment, the convex rounded corner 33 can be depicted as an arc. The arc can be configured so that the angle between two tangent lines to the end points of the arc is an obtuse angle and is preferably in the range of 90° to 110°, particularly preferably in the range of 95° to 105°, or, for example, 100°. These tangent lines are preferably parallel to the central axis 42.1 of the distal end portion 42 or the central axis 41 of the proximal end portion 41.

[0108] The wall 31 is made by casting, ie by injection molding (injection molding or injection molding, in particular when using an injection molding machine). Figure 5 As shown, wall 31 can be cast using core 101; that is, using at least a (second) core 101, wall 31 can be produced by injection molding, for example by injecting material (plastic and / or composite material) into the space between core 101 and a region (wall, etc.) of an injection molding tool (which, for example, includes core 101). Core 101 has a central axis 101.1, which represents, for example, the central axis (particularly the axis of symmetry) of a (e.g., elliptical) cylindrical and / or conical segment of core 101. When casting using the material, i.e., the plastic and / or composite material, this segment preferably assumes the shape of wall 31 and at least a portion of inlet opening 16.

[0109] The wall 31 is cast (injection molded) with the core 101 in such a way that, once produced, in particular cast, with the chamber 2 having the central axis 30 of the chamber 2, the central axis 101.1 of the core 101 extends transversely to the central axis 30 of the chamber 2. That is, for casting the wall 31, the core 101 is arranged in the casting mold (Gussform) in such a way that, once the chamber 2, together with the central axis 30 of the chamber 2, is produced, the core 101 has its central axis 101.1 transversely to the central axis 30 of the chamber 2. Thus, this fluid-technically advantageous configuration of the wall 31 can be produced in particular easily, in particular without using a disposable core. The core 101 can be configured, for example, as a durable core, which can be easily removed from the cast inflow channel 4, in particular its proximal portion 41, after casting of the wall 31 by a pulling movement parallel to its central axis 101.1.

[0110] Thus, the inclination of the core 101 with respect to the central axis 30 of the chamber 2 subsequently obtained defines the inclination of the wall 31 with respect to the central axis 30 of the chamber 2. In particular, the core 101 can be further inclined to the extent that allows the manufacture of the fastening region 20, in particular its edge 22. Thus, the core 101 can be placed, for example, transversely in the casting mold, so that, once the housing with the fastening region 20 (in a single process step) is produced, in particular cast, the core 101 does not (just) touch the fastening region 20, in particular its edge 22, or touches it but does not overlap it.

[0111] In other words, the core 101 can be arranged in the casting mold in such a way that it does not (just) produce the shape of the fastening region 20, in particular its edge 22, during casting, so that, after casting of the fastening region 20, the core 101, for example, rests on the edge 22 or is spaced apart from the edge 22 only by the (relatively thin-walled) mold to form the edge 22. Thus, the manufacture of the fastening region 20 defines the inclination of the core 101 with respect to the central axis 30 of the chamber 2.

[0112] As Figure 5 As shown, in addition to the core 101 for casting the wall 31 (and thus at least a portion of the proximal portion 41) and for casting at least a portion of the inflow opening 16, the core device 100 can have one or more further cores. For example, the core device 101 can have a further core 102 for casting at least a portion of the chamber 2; that is, in the use of at least the (first) core 102, at least a portion of the chamber 2 can be produced by injection molding. Thus, the core device 100 can have the core 102 as a first core and the core 101 as a second core. The cores 101, 102 can form an at least two-part core ("main core"), wherein, for example, the core 102 is an outer core and at least a portion of the core 101 is an inner core.

[0113] The cores 101, 102 are here configured such that the second core 101 can be separated (without damage) from the first core 102 and extends transversely with respect to the first core 102. This means that the cores 101, 102 are not coaxial. The core 102 likewise has, for example, a central axis 102.1, wherein the central axis 101.1 of the core 101 and the central axis 102.1 of the core 102 are transverse to one another, for example when viewed from the side of the core device 100; the central axis 101.1 of the core 101 and the central axis 102.1 of the core 102 can for example be arranged in a common plane. The central axis 102.1 of the core 102 can for example be the central axis (in particular the axis of symmetry) of a cylindrical and / or conical section of the core 102. By means of this section, at least a part of the fastening region 20, for example the edge 22, can for example be formed. If the chamber 2 is cast at least partially by means of the core 102, the central axis 102.1 of the core 102 preferably extends parallel to and / or coaxially to the central axis 30 of the chamber 2.

[0114] That is, by selecting the angle between the cores 101, 102, in particular the angle between their central axes 101.1, 102.1, the wall 31 can be produced to extend transversely to the central axis 30 of the chamber 2. The angle between the cores 101, 102 can for example therefore be selected to lie in the range from 5° to 50°, preferably in the range from 15° to 45°, particularly preferably in the range from 25° to 40°, for example 34° to 38°, in order to obtain a wall 31 which subsequently extends at such an angle transversely to the central axis 30 of the chamber 2.

[0115] As is shown in Figure 5 , the core 101 can extend at least partially inside the core 102. In particular, the core 102 can have a recess 103 in which at least a part of the core 101 is arranged. The recess 103 can be configured at least partially complementary to at least a part of the core 101. In particular, the recess 103 can be configured such that the core 101 is guided linearly and / or parallel to the central axis 101.1 of the core 101 inside the core 102.

[0116] The core 102 is designed for casting a portion of the chamber 2, preferably such that the inflow opening 16 is produced exclusively by the core 101. The core 102 is preferably configured such that the bottom 18 can be defined therethrough and / or such that a portion of the corner 17 can be cast, wherein the bottom 18 is provided, for example, with the inflow opening 16 thereon and preferably defines the chamber 2 (for example, from below). The corner 17 is formed, on the one hand, by the wall 31 and, on the other hand, by a section extending transversely to the wall 31, for example, extending substantially perpendicularly to the central axis 30 of the chamber 2, wherein the core 102 is configured, for example, such that the section extending transversely to the wall 31 can be cast therethrough. The housing can have a (for example, annular) recess defined (from below) by the bottom 18. The recess can (preferably completely) surround the inflow opening 16 and / or at least a portion of the wall 31.

[0117] The core 102 can be configured such that at least a portion of the fastening region 20 can be cast therethrough, i.e., by means of or with the use of the core or in the case of use of the core. In particular, at least the edge 22 of the fastening region 20 can be cast by means of the core 102, preferably by means of a cylindrical and / or conical section, the central axis of which is preferably the central axis 102.1 of the core 102 or is preferably parallel to the central axis 102.1 of the core 102. Alternatively or additionally, further regions, in particular further regions of the main body 1, can also be cast in the case of use of at least the core 102, for example at least a portion of the helical flow channel 19 of the housing or of the main body 1 (see Fig. 1). The flow channel 19 preferably extends such that its downstream end 191 opens into the outflow channel 6 of the outflow connection 5. Figure 3 ) of the main body 1. The flow channel 19 preferably extends such that its downstream end 191 opens into the outflow channel 6 of the outflow connection 5.

[0118] The core device 100 can also comprise an inflow channel core 104 for casting at least a portion of the distal end 42 of the inflow channel 4; at least a portion of the distal end 42 of the inflow channel 4 can be produced by injection molding in the case of use of at least the inflow channel core 104. During casting of the housing, an angle is formed between the cores 104, 101, which angle preferably corresponds to the angle between the central axis 42.1 of the distal end 42 and the central axis 41.1 of the proximal end 41. The angle between the cores 104, 101, preferably the angle between their central axes 104.1, 101.1, can thus be obtuse and preferably be in the range of 90° to 110°, particularly preferably in the range of 95° to 105°. During casting, the cores 101, 104 directly or indirectly touch one another. The inflow channel core 104 can have a conical and / or cylindrical section, at least a portion of the distal end 42 being castable through this conical and / or cylindrical section, wherein the central axis 104.1 of the inflow channel core 104 can form the central axis of the cylindrical and / or conical section of the inflow channel core 104.

[0119] As Figure 5 shown, it is also possible to provide the inflow channel core 104 (or alternatively the core 101) such that the convex rounding 33 can be produced by injection molding in the case of use of the inflow channel core. To this end, the inflow channel core 104 can have a reducible, in particular foldable, section 105. The section 105 is preferably provided at one end of the inflow channel core 104 such that the cores 104, 101 can be connected to one another at least by the section 105, for example during casting. In the unreduced state of the section 105, the convex rounding 33 is cast by the section 105; in the reduced state of the section 105, the inflow channel core 104 is removed from the cast inflow channel 4. The section 105 can be foldable and thus reducible by virtue of having a mechanism, for example one or more joints, which allows the section 105 to be folded. Alternatively or additionally, the section 105 can also be reducible by virtue of being retractable, for example into a portion, for example a cavity, of the inflow channel core 104. The inflow channel core can have a mechanism, for example a linear guide element, for example a rail, which enables the section 105 to be retracted. The section 105 is retracted in the reduced state and not retracted in the unreduced state.

[0120] Since the section 105 is reducible, the inflow channel core 104 together with the section 105 can be easily removed from the cast housing. In other words, the section 105 can be reduced so as not to impede removal of the inflow channel core 104 from the housing. Thus, a complex definition of the inflow channel 4, namely the convex rounding 33, which provides flow-technically advantageous conditions in the inflow channel 4, can be easily produced.

[0121] The core device 100 can also have an outflow channel core 106 for casting at least a portion of the outflow channel 6, for example at least the distal portion 61 of the outflow channel 6; thus, at least a portion of the outflow channel 6 can be manufactured by injection molding in the case of using at least the outflow channel core 106. By correspondingly providing the outflow channel core 106, at least a portion of the outflow channel 6 can be configured such that the distal portion 42 and / or the proximal portion 41 of the inflow channel 4 is inclined relative to the at least a portion of the outflow channel 6. The outflow channel core 106 can be configured such that an angle between the outflow channel core 106, in particular a central axis 106.1 of the outflow channel core 106, and the inflow channel core 104, in particular a central axis 104.1 of the inflow channel core 104, is in the range of 15° to 35°, preferably 20° to 30°, particularly preferably 24° to 28°, or for example 26°. The outflow channel core 106 can have a conical and / or cylindrical section through which at least a portion of the distal portion 61 can be cast, wherein the central axis 106.1 of the inflow channel core 106 can form a central axis of the cylindrical and / or conical section of the outflow channel core 106.

[0122] At least the core 101 and the core 102 can each be a durable core. Alternatively or additionally, the core 104, the section 105 and / or the core 106 can each be a durable core.

[0123] The core device 100 can be placed in a casting mold in order to cast a housing with the core device 100, for example Figures 1 to 4 the illustrated housing. The housing thus obtains a cavity which is at least partially complementarily formed with respect to the core device 100.

[0124] The housing is at least partially manufactured from a composite material and / or a plastic. That is, the housing is manufactured with the core device 100 using a composite material and / or a plastic.

[0125] Figure 6 It is exemplarily shown how a pressure loss inside a housing can be reduced by a housing according to the above-mentioned embodiments, in which the wall 31 extends transversely with respect to the central axis 30 of the chamber 2. In Figure 6 In the example according to the application, the delivery height H is almost the same as for the comparative housing made of cast iron. Thus, by means of the technical solution of the application, not only can a housing be manufactured particularly easily, i.e. by injection molding and using a plastic and / or a composite material, but also the pressure drop of a fluid in the housing can be effectively reduced.

Claims

1. An injection molded housing made of plastic and / or composite material for a fluid guiding device, characterized in that, The housing comprises: - an inflow connector (3) having an inflow channel (4) for a fluid, - an outflow connector (5) having an outflow channel (6), - a chamber (2) for a transport wheel which can be driven in rotation, wherein the chamber (2) has an inflow opening (16) into which a proximal portion (41) of the inflow channel (4) opens, and - a fastening region (20) which extends radially outwards substantially perpendicular to a central axis (30) of the chamber (2), wherein the inflow connector (3) has a wall (31) which delimits at least a portion of the proximal portion (41) of the inflow channel (4) and at least a portion of the inflow opening (16), wherein the wall (31) extends transversely to the central axis (30), wherein the wall (31) is obtained by injection molding using a core (101) which extends transversely to the central axis (30) of the chamber (2).

2. The housing of claim 1, wherein The core (101) has a central axis (101.1) which extends transversely to the central axis (30) of the chamber (2).

3. The housing of claim 2, wherein, The central axis (101.1) of the core (101) is a central axis of a section of the core (101), wherein at least the wall (31) is injection molded by means of the section.

4. The housing of claim 3, wherein, The section of the core (101) has an elliptical cross section.

5. The case according to claim 3, characterized in that, The section of the core (101) is cylindrical and / or conical.

6. The case according to claim 3, characterized in that, At least a portion of the inflow opening (16) is injection molded by means of the section.

7. The housing of any one of claims 1 to 6, wherein, In a cross section parallel to the central axis (30) of the chamber (2), the wall (31) extends along a straight line transversely to the central axis (30) of the chamber (2) starting from the inflow opening (16), in particular from an edge which delimits the inflow opening (16).

8. The housing of any one of claims 1 to 6, wherein, An angle between a central axis (41.1) of the wall (31) or of the proximal portion (41) of the inflow channel (4) and the central axis (30) of the chamber (2) is in the range of 5° to 50°.

9. The case according to claim 8, characterized in that, An angle between a central axis (41.1) of the wall (31) or of the proximal portion (41) of the inflow channel (4) and the central axis (30) of the chamber (2) is in the range of 15° to 45°.

10. The case of claim 9, wherein, The angle is in the range of 25° to 40°.

11. The case of claim 9, wherein, The angle is in the range of 34° to 38°.

12. The housing of any one of claims 1 to 6, wherein, The inflow channel (4) has a distal portion (42), and wherein an angle between a central axis (42.1) of the distal portion (42) and a central axis (41.1) of the wall (31) or of the proximal portion (41) of the inflow channel (4) is an obtuse angle.

13. The case of claim 12, wherein, The angle is in the range of 90° to 110°.

14. The case of claim 13, wherein, The angle is in the range of 95° to 105°.

15. The case according to any one of claims 1 to 6, characterized in that, An angle between an axis of a connection (7) of the inflow connector (3) and a connection (8) of the outflow connector (5), which are each at least partially arranged thereon and extend through the inflow connector (3) and the outflow connector (5), and a central axis (42.1) of a distal end (42) of the inflow channel (4) is in a range of 15° to 35°.

16. The case of claim 15, wherein, The angle is in a range of 20° to 30°.

17. The case of claim 15, wherein, The angle is in a range of 24° to 28°.

18. The case according to any one of claims 1 to 6, characterized by The fastening region (20) is a flange.

19. The case according to any one of claims 1 to 6, characterized in that, The fastening region (20) extends at least partially around a central axis (30) of the chamber (2).

20. The case of any one of claims 1 to 6, wherein, The inflow connector (3) has a convex fillet (33) which at least laterally delimits a proximal end (41) of the inflow channel (4).

21. The case of claim 20, wherein, The convex fillet laterally delimits a distal end (42) of the inflow channel (4).

22. The case of claim 20, wherein, The convex fillet (33) depicts an arc in a cross section parallel to a central axis (30) of the chamber (2), wherein an angle between two tangents which are tangential to end points of the arc is an obtuse angle.

23. The case of claim 22, wherein, The angle is in a range of 90° to 110°.

24. The case of claim 23, wherein, The angle is in a range of 95° to 105°.

25. The case of any one of claims 1 to 6, wherein, The fluid guiding device is a centrifugal pump.

26. The case of any one of claims 1 to 6, wherein, The housing is configured in one piece.

27. A core device (100) for at least partially manufacturing an injection-molded housing for a fluid guiding device, characterized in that The housing comprises an inflow connector (3) having an inflow channel (4) for a fluid and a chamber (2) for a transport wheel which can be driven in rotation, wherein the chamber (2) has an inflow opening (16) into which a proximal end (41) of the inflow channel (4) opens, wherein the core device (100) has: - a first core (102), wherein at least a part of the chamber (2) can be produced by injection molding in the case of using at least the first core (102), and - a second core (101), wherein at least a part of the proximal end (41) of the inflow channel (4) and at least a part of the inflow opening (16) can be produced by injection molding in the case of using at least the second core (101), wherein the second core (101) can be separated from the first core (102) and extends transversely with respect to the first core (102).

28. The core apparatus (100) according to claim 27, characterized in that A central axis (101.1) of the second core (101) extends transversely to a central axis (102.1) of the first core (102).

29. A core device (100) according to claim 27 or 28, characterized in that An angle between the first core (102) and the second core (101) is in a range of 5° to 50°.

30. The core apparatus (100) according to claim 29, characterized in that The angle is in a range of 15° to 45°.

31. The core apparatus (100) according to claim 29, characterized in that The angle is in a range of 25° to 40°.

32. The core apparatus (100) according to claim 29, characterized in that The angle is in a range of 34° to 38°.

33. The core apparatus (100) according to claim 29, characterized in that The angle is an angle between a central axis of the first core and a central axis of the second core.

34. The core device (100) according to claim 27 or 28, characterized in that The second core (101) extends at least partially inside the first core (102).

35. The core device (100) according to claim 27 or 28, characterized in that The first core (102) has a recess (103) in which at least a part of the second core (101) is arranged.

36. The core device (100) according to claim 27 or 28, characterized in that At least a portion of a fastening region (20) of the housing is producible by injection molding using at least the first core (102), the fastening region extending radially outward substantially perpendicular to a center axis (30) of the chamber (2).

37. The core device (100) according to claim 27 or 28, characterized in that At least a portion of a helical flow channel (19) of the housing is producible by injection molding using at least the first core (102).

38. The core apparatus (100) according to claim 37, characterized in that The helical flow channel (19) opens with its downstream end (191) into the outflow channel (6) of the housing.

39. The core apparatus (100) according to claim 27 or 28, characterized in that There is also an inflow channel core (104), wherein at least a portion of a distal end (42) of the inflow channel (4) is producible by injection molding using at least the inflow channel core (104).

40. The core apparatus (100) according to claim 39, characterized in that An angle between the second core (101) and the inflow channel core (104) is obtuse.

41. The core apparatus (100) according to claim 40, characterized in that The angle is in a range of 90° to 110°.

42. The core apparatus (100) according to claim 40, characterized in that The angle is in a range of 95° to 105°.

43. The core apparatus (100) according to claim 27 or 28, characterized in that A convex fillet (33) defining at least a proximal end (41) of the inflow channel (4) is producible by injection molding using at least the core device (100).

44. The core apparatus (100) according to claim 43, characterized in that The convex fillet defines a distal end (42) of the inflow channel (4).

45. The core apparatus (100) according to claim 43, characterized in that The core device (100) has a collapsible section (105), wherein the convex fillet (33) is producible by injection molding using at least the section (105).

46. The core apparatus (100) according to claim 45, characterized in that The section is foldable and / or retractable.

47. The core apparatus (100) according to claim 39, characterized in that There is also an outflow channel core (106), wherein at least a portion of the outflow channel (6) of the housing is producible by injection molding using at least the outflow channel core (106).

48. The core apparatus (100) according to claim 47, characterized in that An angle between the outflow channel core (106) and the inflow channel core (104) is in a range of 15° to 35°.

49. The core apparatus (100) according to claim 48, characterized in that An angle between the outflow channel core and the inflow channel core is in a range of 20° to 30°.

50. The core apparatus (100) according to claim 48, characterized in that An angle between the outflow channel core and the inflow channel core is in a range of 24° to 28°.

51. The core apparatus (100) according to claim 27 or 28, characterized in that At least the first core (102) and / or the second core (101) is / are a durable core, respectively.

52. The core apparatus of claim 27 or 28 wherein, The fluid guiding device is a centrifugal pump.

53. An injection molding tool, characterized by The injection molding tool has a core device (100) according to any one of claims 27 to 52.

54. The injection molding tool of claim 53, wherein, The injection molding tool is an injection mold.

55. An injection molded housing made of plastic and / or composite material for a fluid guiding device, characterized in that The housing comprises: - an inflow connection (3) having an inflow channel (4) for a fluid, - an outflow connection (5) having an outflow channel (6), - a chamber (2) for a transport wheel that can be driven in rotation, wherein the chamber (2) has an inflow opening (16) into which a proximal end (41) of the inflow channel (4) opens, and - a fastening region (20) that extends radially outward substantially perpendicular to a center axis (30) of the chamber (2), The housing is obtained by injection molding using the core device (100) according to any one of claims 27 to 52 or using the injection molding tool according to claim 53.

56. The case of claim 55, wherein, The inflow connection (3) has a wall (31) which defines at least a portion of the proximal end (41) of the inflow channel (4) and at least a portion of the inflow opening (16), wherein the wall (31) is injection molded by a second core (101).

57. The case of claim 55 or 56, wherein, The housing is obtained by injection molding using the core device (100) according to any one of claims 27 to 52 or using the injection molding tool according to claim 53.

58. The case of claim 55 or 56, wherein, The housing is configured in one piece.

59. The case of claim 55, wherein, The fluid guiding device is a centrifugal pump.

60. A fluid directing device, comprising: A housing according to any one of claims 1 to 26 or according to any one of claims 55 to 59; a transport wheel which can be driven in rotation, wherein the transport wheel is arranged at least partially in the chamber (2) of the housing and can be rotated about a central axis (30) of the chamber (2).

61. The fluid directing device of claim 60, wherein, The fluid guiding device is a centrifugal pump.

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