Pump device, pump and method for producing a pump device

Abstract

The invention relates to a pump device (14a; 14b) having a drive shaft (16a; 16b) which has a receiving portion (38a; 38b) for receiving a hub (32a; 32b) in a mounted state and which has a chamfer (26a; 26b) on at least one end face (18a; 18b) with respect to the axial direction (20a; 20b) of the drive shaft (16a; 16b). According to the invention, the drive shaft (16a; 16b) has a bevel (28a; 28b), in particular in the region of the receiving portion (38a; 38b), said bevel adjoining the chamfer (26a; 26b).

Description

[0001] Pump device, pump and method for producing a pump device

[0002] State of the art

[0003] The invention relates to a pump device according to claim 1, a pump with a pump device according to claim 14 and a method for producing a pump device according to claim 15.

[0004] Pumps with drive shafts for impellers are already known from the state of the art, with the drive shafts having a chamfer on one end face.

[0005] The object of the invention is, in particular, to provide a generic device with improved assembly properties. This object is achieved according to the invention by the features of patent claim 1, while advantageous embodiments and further developments of the invention can be found in the subclaims.

[0006] Advantages of the invention

[0007] The invention is based on a pump device with a drive shaft having a receiving portion for receiving a hub in an assembled state, which drive shaft has a chamfer on at least one end face with respect to an axial direction of the drive shaft.

[0008] It is proposed that the drive shaft, particularly in the region of the receiving portion, have a bevel adjoining the chamfer. Such a configuration advantageously provides a pump device with improved assembly properties. In particular, convenient guidance of a further element, in particular a hub, onto the drive shaft can be enabled. Advantageously, tilting of the drive shaft with the further element during assembly can be prevented or at least significantly reduced. An assembly-friendly and advantageously gentle connection of the drive shaft with the further element can be achieved.

[0009] A “pump device” should be understood in particular to mean at least one part, in particular a subassembly, of a pump. In particular, the pump device can also comprise the entire pump. A “pump”, in particular a submersible pump, should be understood in particular to mean a device which, in at least one operating state, provides movement of a preferably incompressible liquid to be pumped. The pump device preferably has a casing unit which delimits the pump to the outside, the drive shaft which is operated by a motor unit of the pump device and / or a screw unit, in particular a pump impeller, which is set in rotation by the drive shaft in at least one operating state, wherein in particular the rotation of the screw unit provides the movement of the liquid to be pumped.Alternatively, the pump device can comprise a piston unit driven by a motor unit of the pump device, which sets the liquid to be pumped in motion through a displacement process. Advantageously, the motor unit is arranged within an outwardly delimited motor compartment of the pump device. In particular, the motor unit can comprise an internal combustion engine and / or a hydraulic motor. Particularly advantageously, the motor unit comprises an electric motor. The pump can, in particular, in at least one operating state, be arranged outside and / or at least partially or even completely within the liquid to be pumped.

[0010] Preferably, the drive shaft is rotatably mounted about a longitudinal axis of the drive shaft, which is aligned parallel to the axial direction, in particular by means of at least one plain bearing and / or rolling bearing of the pump device. Particularly preferably, the drive shaft performs a rotational movement about the longitudinal axis in an operating state.

[0011] During assembly of the drive shaft with a further element, in particular a hub, of the pump device, the chamfer is preferably provided for centering the further element. The further element preferably has an opening in the center, the dimensions of which are adapted to the drive shaft. When viewed perpendicular to the axial direction, the chamfer is advantageously inclined by an angle of at least 35° and at most 55° relative to the axial direction. The angle of the chamfer is preferably 45°. The drive shaft has a stop against which the further element abuts, in particular directly, in an assembled state. Preferably, the bevel adjoins the chamfer directly when viewed along the axial direction. A “receiving section” is to be understood in particular as a partial region of the drive shaft which is provided to receive the hub.In particular, the receiving section is provided for transmitting torque to the hub. Preferably, the receiving section is positively connected to the hub for torque transmission. Preferably, the receiving section directly adjoins the stop.

[0012] "Intended" should be understood as specifically designed and / or equipped. The fact that an object is intended for a specific function should be understood as meaning that the object fulfills and / or performs this specific function in at least one application and / or operating state.

[0013] It is further proposed that the drive shaft have a guide section for guiding the hub during assembly, in which the chamfer and bevel are arranged. This advantageously allows for improved assembly by enabling convenient guidance of the hub via the guide section of the drive shaft.

[0014] Furthermore, it is proposed that, viewed perpendicular to the axial direction, a surface of the drive shaft in a region of the bevel be inclined relative to the axial direction by an angle of at least 0.5°, in particular of at least 0.75°, and advantageously of at least 1°. This can better prevent damage to the drive shaft, as the bevel allows for careful guidance of the hub over the guide section of the drive shaft. Furthermore, during assembly, laborious rotation of the drive shaft to align the polygonal cross-sections of the drive shaft and the hub can be avoided.

[0015] It is further proposed that, viewed perpendicular to the axial direction, a surface of the drive shaft in a region of the bevel is inclined relative to the axial direction by an angle of at most 5°, in particular of at most 3° and advantageously of at most 2°. This enables particularly simple assembly of the drive shaft with, at the same time, particularly low load loss. Furthermore, it is proposed that, viewed perpendicular to the axial direction, a surface of the drive shaft in at least part of the receiving section is aligned parallel to the axial direction. This advantageously makes it possible to provide a drive shaft with improved assembly properties. Preferably, the drive shaft, in particular the receiving section, preferably the parallel part of the receiving section, is provided to transmit a torque to the hub.Preferably, the receiving section extends from the chamfer along the axial direction to the stop of the drive shaft.

[0016] It is further proposed that the drive shaft, at least in the receiving section, has a polygonal cross-section, at least in sections, preferably completely. This makes it possible to transmit torque from the drive shaft to the hub as simply as possible. Preferably, the polygonal cross-section of the receiving section, in particular in the parallel part of the receiving section, is intended to transmit the torque. In particular, a polygonal shape represents a flat geometric shape formed by a closed line section with several, preferably at least three, corners / angles. Polygons / polygons with rounded corners and / or slightly bulbous sides also represent polygons within the meaning of the invention. Angular shapes with only one or only two rounded corners also represent angular shapes within the meaning of the invention.Alternatively, the cross-section of the receiving section, in particular an inner cross-sectional contour of the receiving section, could also have only one corner or only two corners. For example, such a cross-section could have a drop-shaped or teardrop-shaped contour. In particular, a cross-sectional profile of the receiving section along the axial direction has a cross-section deviating from a circular shape for more than 25%, preferably more than 45%, preferably more than 66%, particularly preferably more than 80%, and particularly advantageously more than 95% of a total extent of the receiving section, which cross-section is preferably angular, preferably polygonal. The polygonal cross-section is preferably trigonal, tetragonal, pentagonal, or hexagonal, wherein a substantially trigonal, tetragonal, pentagonal, or hexagonal cross-section preferably also includes the corresponding polygons with rounded corners and / or bulbous sides.For example, guitar picks familiar from everyday life or the well-known logo of the sports car brand Lamborghini also have an essentially tetragonal contour within the meaning of the invention. It is also proposed that the bevel forms a section following the polygonal cross-section. Preferably, the section following the polygonal cross-section has a polygonal cross-section, particularly when viewed along the axial direction. This can advantageously further improve the time-consuming turning of the drive shaft during assembly to ensure that the polygonal cross-sections of the drive shaft and the hub match. In one embodiment, the section following the polygonal cross-section forms only part of the bevel, with at least one further section of the bevel being differently shaped, in particular having a circular or differently polygonally shaped cross-section.However, it is particularly preferred that the section following the polygonal cross-section forms the entire bevel. A section following a polygon is to be understood in particular as a section which has at least a cross-section proportional to the polygonal cross-section, wherein in particular the cross-section forms at least the same polygon. In particular, the section following the polygonal cross-section, in particular the entire bevel, is at least approximately truncated pyramid-shaped. Truncated pyramid-shaped is to be understood as a body which has a cross-sectional profile which tapers continuously along the central axis of the body, in particular from a base surface to a top surface. The cross-sectional profile is preferably uniform, so that along the bevel the side surfaces of the body linearly connect the base and top surfaces.Preferably, an imaginary section following the polygonal cross-section, in particular enclosing the bevel, the smallest possible rotationally symmetrical body, is at least approximately frustoconical, in particular conical. Preferably, the section of the drive shaft following the polygonal cross-section, viewed along the axial direction, has a non-circular cross-section, preferably a polygonal, in particular polygonal, cross-section. It would be conceivable for at least one corner, in particular all corners, of the polygonal cross-section to have an acute, obtuse, or right angle. Furthermore, it is conceivable for the corners of the cross-section to have different angles. Preferably, the corners of the cross-section are rounded and / or the edges of the cross-section are bulbous.

[0017] In at least one further embodiment of the invention, the bevel, in particular adjacent to the chamfer, has a cross-section that is shaped differently from the parallel part of the receiving unit, such as a circular and / or a differently polygonal cross-section. In particular, along the bevel, in one cross-section, it transitions from a polygonal cross-section to an at least substantially differently shaped cross-section, wherein in particular the bevel runs continuously, in particular tangentially smoothly, preferably without steps, from the polygonal cross-section to the at least substantially differently shaped cross-section.

[0018] Furthermore, it is proposed that the chamfer, particularly when viewed parallel to the axial direction, have an at least substantially polygonal contour, in particular, being designed to follow the polygonal cross-section. This advantageously further improves the time-consuming process of rotating the drive shaft during assembly to ensure that the polygonal cross-sections of the drive shaft and the hub match. Furthermore, manufacturing of the drive shaft, particularly of the chamfer, can be further simplified.

[0019] Preferably, both the entire guide section and the entire receiving section of the drive shaft have polygonal cross-sections.

[0020] Furthermore, it is proposed that the cross section, in particular of the receiving section, preferably of the guide section, in particular of the bevel and / or the chamfer, and / or of the parallel part of the receiving section, be triangular, wherein, in particular viewed perpendicular to the axial direction, a surface of the drive shaft in a region of the bevel is inclined relative to the axial direction by an angle of at least 1° and at most 3°. This allows for simple assembly of the drive shaft by preventing laborious rotation of the drive shaft to align the polygonal cross sections of the drive shaft and the hub.

[0021] Furthermore, it is proposed that the cross section, in particular of the receiving section, preferably of the guide section, in particular of the bevel and / or the chamfer, and / or of the parallel part of the receiving section, be four-sided, wherein, in particular viewed perpendicular to the axial direction, a surface of the drive shaft in a region of the bevel is inclined relative to the axial direction by an angle of at least 0.5° and at most 2°. This allows for particularly simple assembly of the drive shaft by preventing laborious rotation of the drive shaft to align the polygonal cross sections of the drive shaft and the hub.

[0022] Furthermore, it is proposed that, viewed perpendicular to the axial direction, the drive shaft, in particular the receiving portion, preferably the guide portion, has a smooth transition portion between the bevel and the part of the receiving portion running parallel to the axial direction. This can better prevent damage to the drive shaft during assembly, as the smooth transition portion allows the hub to slide smoothly onto the drive shaft. The transition portion is preferably formed as a rounded portion.

[0023] It is further proposed that the transition section be configured to follow the shape of the receiving section, in particular the bevel and / or the part of the receiving section parallel to the axial direction, in particular the polygonal cross-section. In particular, the transition section has a contour, preferably a cross-section, which, particularly when viewed parallel to the axial direction, is polygonal, in particular proportional to a cross-section of the receiving section, preferably the guide section, preferably the bevel and / or the chamfer, and / or the parallel part of the receiving section.

[0024] Furthermore, it is proposed that the transition section, viewed perpendicular to the axial direction, have a radius of curvature that corresponds to at least half the length of the receiving section and at most twice the length of the receiving section along the axial direction. Particularly preferably, the radius of curvature corresponds at least approximately to the length of the receiving section along the axial direction. This makes it even easier to prevent damage to the drive shaft during assembly. In particular, the transition cross-section transitions smoothly tangentially into the parallel part of the receiving section. Preferably, the transition section transitions smoothly tangentially into the bevel.

[0025] It is further proposed that the guide section extend along the axial direction over a length corresponding to at least one-eighth of the length of the receiving section and at most one-third of the length of the receiving section. Particularly preferably, the bevel corresponds to at least approximately one-fifth of the length of the receiving section. This allows for simple assembly of the drive shaft.

[0026] In particular, the length of the part of the receiving section parallel to the axial direction is approximately at least two-thirds of the length of the receiving section and at most seven-eighths of the length of the receiving section. Preferably, the length of the part of the receiving section parallel to the axial direction is approximately four-fifths of the length of the receiving section.

[0027] Finally, it is proposed that a length of the guide section, viewed perpendicular to the axial direction, be at least a factor of 5 greater than a length of the chamfer and a maximum of 20 greater than a length of the chamfer. Particularly preferably, the length of the bevel, viewed perpendicular to the axial direction, is at least approximately a factor of 10 greater than the length of the chamfer. This allows for particularly simple assembly of the drive shaft.

[0028] The invention further relates to a method for manufacturing the pump device, in particular the drive shaft. When manufacturing the drive shaft, in particular when introducing the bevel, any machining methods deemed appropriate by a person skilled in the art can be used, in particular forming methods and / or machining methods, such as drawing or non-circular turning methods. The pump device is not intended to be limited to the application and embodiment described above. In particular, the pump device may have a number of individual elements, components, and units that differs from the number stated herein to fulfill a function described herein.

[0029] All values, in particular angle and length specifications, all information on alignments, such as "vertical" and "parallel", and all information on shapes should be understood taking into account common manufacturing tolerances.

[0030] Drawings

[0031] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an exemplary embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0032] They show:

[0033] Fig. 1 is a schematic representation of a pump with a pumping device in a side, partially sectioned view,

[0034] Fig. 2 the pump device with a drive shaft and a hub in a side, partially sectioned view,

[0035] Fig. 3 a section of the drive shaft in side view,

[0036] Fig. 4 a front side of the drive shaft with a three-sided polygonal cross-section,

[0037] Fig. 5 is a flow chart of a method for manufacturing the pump device and

[0038] Fig. 6 shows an end face of a drive shaft with a four-sided polygonal cross-section of a further embodiment of a pump device.

[0039] Description of the embodiments

[0040] Fig.1 shows a pump 10a, in particular a centrifugal pump or centrifugal pump, with a pump impeller 12a, which in an operating state provides a movement of an incompressible liquid to be pumped.

[0041] As illustrated in Fig. 2, the pump 10a has a pump device 14a. The pump device 14a has a drive shaft 16a. The drive shaft 16a is rotatably mounted about a longitudinal axis of the drive shaft 16a, which is aligned parallel to an axial direction 20a of the drive shaft 16a.

[0042] Fig. 3 shows a side view of a section of the drive shaft 16a, which has a chamfer 26a on at least one end face 18a with respect to the axial direction 20a, wherein the drive shaft 16a has a bevel 28a adjacent to the chamfer 26a. The drive shaft 16a has a guide section 30a for guiding a hub 32a of the pump device 14a during assembly, in which guide section the chamfer 26a and the bevel 28a are arranged. Furthermore, the drive shaft has a stop 46a against which the hub 32a abuts, in particular directly, in an assembled state.

[0043] The drive shaft 16a has a receiving section 38a for receiving the hub 32a in an assembled state. The receiving section 38a is provided for torque transmission from the drive shaft 16a to the hub 32a. The drive shaft 16a has the bevel in the region of the receiving section 38a adjacent to the chamfer 26a. In the receiving section, viewed perpendicular to the axial direction 20a, a surface 36a of the drive shaft 16a is oriented parallel to the axial direction 20a in at least a part 48a of the receiving section 38a (cf. Fig. 2 and Fig. 3). The drive shaft 16a has, at least in the receiving section 38a, at least in sections, a polygonal cross-section 40a.

[0044] The bevel 28a forms a section 34a following the polygonal cross-section 40a. The bevel 28a is at least substantially truncated pyramid-shaped. The chamfer 26a has an at least substantially polygonal contour 50a when viewed parallel to the axial direction 20. The chamfer 26a is formed following the polygonal cross-section 40a.

[0045] Viewed perpendicular to the axial direction 20a, a surface 36a of the drive shaft 16a is inclined in a region of the bevel 28a relative to the axial direction 20a by an angle W of at least 0.5° and / or at most 5°.

[0046] Viewed perpendicular to the axial direction 20a, the drive shaft 16a has a smooth transition section 44a between the bevel 28a and a part of the receiving section 48a running parallel to the axial direction 20a, which transition section is particularly designed as a rounded portion. The transition section 44a is designed to follow the shape of the receiving section 38a. The transition section 44a is designed to follow the bevel and / or the part of the receiving section 48a running parallel to the axial direction. The transition section 44a is designed to follow the polygonal cross-section 40a. Viewed perpendicular to the axial direction 20a, the transition section 44a has a radius of curvature R that corresponds to a length L of the receiving section 38a along the axial direction 20a.

[0047] The bevel 28a extends along the axial direction 20a over a length L1, which corresponds to one fifth of a length L of the receiving portion 38a.

[0048] A length L1 of the bevel 28a is, viewed perpendicular to the axial direction 20a, greater by a factor of 10 than a length L2 of the chamfer 26a.

[0049] Fig. 4 shows the end face 18a of the drive shaft 16a with the stop 46a from Fig. 2. The cross section 40a is three-sided, wherein, viewed perpendicular to the axial direction 20a, a surface 36a of the drive shaft 16a is inclined in a region of the bevel 28a relative to the axial direction 20a by an angle of at least 1 ° and at most 3 °.

[0050] Fig. 5 shows a schematic sequence of a method for manufacturing the pump device 14a. In a method step 100a, the drive shaft 16a is formed with the polygonal cross-section 40a, for example, by polygonal turning or the like. In method step 100a, the receiving section 38a is formed with the polygonal cross-section 40a. In a further method step 102a, the bevel 28a of the drive shaft 16a is formed, for example, by milling or the like. In an additional method step 104a, the chamfer 26a of the drive shaft 16a is formed, for example, by milling or the like.

[0051] A further exemplary embodiment of the invention is shown in Fig. 6. The following description, drawings and table are essentially limited to the differences between the exemplary embodiments, whereby with regard to components with the same designation, in particular with regard to components with the same reference numerals, reference can in principle also be made to the drawings and / or description and / or table of the other exemplary embodiments, in particular those in Figs. 1 to 5. To distinguish the exemplary embodiments, the letter a is placed after the reference numerals of the exemplary embodiment in Figs. 1 to 5. In the exemplary embodiment in Fig. 6, the letter a is replaced by the letter b.

[0052] In Fig. 6, in another embodiment of a pump device 12b, a cross-section 40b is four-sided, wherein, viewed perpendicular to an axial direction 20b, a surface 36b of a drive shaft 16b is inclined in a region of a bevel 28b relative to the axial direction 20b by an angle W of at least 0.5° and at most 2°. The angles for different sizes of the drive shaft 16b can be found in Table 2 below.

[0053] List of reference symbols

[0054] 10 Pump

[0055] 12 Pump impeller

[0056] 14 Pump device

[0057] 16 Drive shaft

[0058] 18 Front side

[0059] 20 Axial direction

[0060] 26 chamfer

[0061] 28 Bevel

[0062] 30 guide section

[0063] 32 Hub

[0064] Section 34

[0065] 36 Surface

[0066] 38 Recording section

[0067] 40 polygonal cross-section

[0068] 44 Transition section

[0069] 46 stop

[0070] 48 Part of the recording section

[0071] 50 Polygonal contour

[0072] R radius of curvature

[0073] W angle

[0074] L Length of receiving section

[0075] L1 Length bevel

[0076] L2 Length chamfer

[0077] 100 process steps

[0078] 102 Process step

[0079] 104 Process step

Claims

04. 04.25 Claims 1. Pump device (14a; 14b) with a drive shaft (16a; 16b) having a receiving section (38a; 38b) for receiving a hub (32a; 32b) in an assembled state, which drive shaft has a chamfer (26a; 26b) on at least one end face (18a; 18b) with respect to an axial direction (20a; 20b) of the drive shaft (16a; 16b), characterized in that the drive shaft (16a; 16b), in particular in the region of the receiving section (38a; 38b), has a bevel (28a; 28b) adjoining the chamfer (26a; 26b).

2. Pump device (14a; 14b) according to claim 1, characterized in that the drive shaft (16a; 16b) has a guide section (30a; 30b) for guiding the hub (32a; 32b) during assembly, in which the chamfer (26a; 26b) and the bevel (28a; 28b) are arranged.

3. Pump device (14a; 14b) according to claim 1 or 2, characterized in that, viewed perpendicular to the axial direction (20a; 20b), a surface (36a; 36b) of the drive shaft (16a; 16b) is inclined in a region of the bevel (28a; 28b) relative to the axial direction (20a; 20b) by an angle (W) of at least 0.5°.

4. Pump device (14a; 14b) according to one of the preceding claims, characterized in that, viewed perpendicular to the axial direction (20a; 20b), a surface (36a; 36b) of the drive shaft (16a; 16b) is inclined in a region of the bevel (28a; 28b) relative to the axial direction (20a; 20b) by an angle (W) of at most 5°.

5. Pump device (14a; 14b) according to one of the preceding claims, characterized in that, in the receiving section (38a; 38b) viewed perpendicular to the axial direction (20a; 20b), a surface (36a; 36b) of the drive shaft (16a; 16b) is aligned parallel to the axial direction (20a; 20b) in at least a part of the receiving section (48a; 48b).

6. Pump device (14a; 14b) according to one of the preceding claims, characterized in that the drive shaft (16a; 16b) has a polygonal cross-section (40a; 40b) at least in sections in the receiving section (38a; 38b).

7. Pump device (14a; 14b) according to claim 6, characterized in that the bevel (28a; 28b) forms a section (34a; 34b) following the polygonal cross-section (40a; 40b).

8. Pump device (14a; 14b) according to one of the preceding claims, characterized in that the chamfer (26a; 26b), in particular when viewed parallel to the axial direction (20a; 20b), has an at least substantially polygonal contour (50a; 50b), in particular is formed following the polygonal cross-section (40a; 40b).

9. Pump device (14a) according to claim 6, characterized in that the cross section (40a) is three-sided, wherein, in particular viewed perpendicular to the axial direction, a surface of the drive shaft (16a) is inclined in a region of the bevel relative to the axial direction (20a) by an angle (W) of at least 0.5° and at most 3°.

10. Pump device (14b) according to claim 6, characterized in that the cross section (40b) is four-sided, wherein, in particular viewed perpendicular to the axial direction (20b), a surface (36b) of the drive shaft (16b) is inclined in a region of the bevel (28b) relative to the axial direction (20b) by an angle (W) of at least 0.5° and at most 3°.

11. Pump device (14a; 14b) according to one of the preceding claims, characterized in that, viewed perpendicular to the axial direction (20a; 20b), the drive shaft (16a; 16b) has a smooth transition section (44a; 44b) between the bevel (28a; 28b) and a part of the receiving section (48a; 48b) running parallel to the axial direction (20a; 20b), which transition section is designed in particular as a rounding.

12. Pump device (14a; 14b) at least according to claim 5 and 11, characterized in that the transition section (44a; 44b) is designed to follow the shape of the receiving section (38a; 38b), in particular the bevel (28a; 28b) and / or the part of the receiving section (48a; 48b) running parallel to the axial direction (20a; 20b), in particular the polygonal cross section (40a; 40b).

13. Pump device (14a; 14b) according to claim 11 or 12, characterized in that the transition section (44a; 44b) viewed perpendicular to the axial direction (20a; 20b) has a radius of curvature (R) which corresponds to at least half a length (L) of the receiving section (38a; 38b) and at most twice the length (L) of the receiving section (38a; 38b) along the axial direction (20a; 20b).

14. Pump device (14a; 14b) according to claim 2 and 5, characterized in that the guide section (30a; 30b) extends along the axial direction (20a; 20b) over a length (L1) which corresponds to at least one eighth of a length (L) of the receiving section (38a; 38b) and at most one third of a length (L) of the receiving section (38a; 38b).

15. Pump device (14a; 14b) according to one of the preceding claims, characterized in that a length (L1) of the guide section (30a; 30b) viewed perpendicular to the axial direction (20a; 20b) is at least a factor of 5 greater than a length (L2) of the chamfer (26a; 26b) and by a maximum factor of 20 greater than the length (L2) of the chamfer (26a; 26b).

16. Pump (10a; 10b), in particular a centrifugal pump or a rotary pump, with a pump device (14a; 14b) according to one of the preceding claims.

17. A method for producing a pump device (14a; 14b) according to one of claims 1 to 13.

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