EP2241753B1 - Motor pump unit - Google Patents

Description

The invention relates to a motor pump unit specified in the preamble of claim 1. Art.

The end EP 1 731 762 A (Prior art) known motor pump unit has a basic type of a molded outer housing with integrated breakthrough transverse wall. The transverse wall is subjected to various processing steps together with the outer housing in order to assemble different pump element assemblies (radial piston pump elements and / or gear pump elements, single-circuit, dual-circuit). Radial piston pump elements are mounted with steel blocks and steel liners and connected to the inside of the transverse wall formed, a steel lining compliant pressure channel; Gear pump elements, however, directly to the pressure channel. With several radial piston pump elements, only one is connected to the pressure channel via the steel block, while the others are connected to one steel block via separately installed manifolds. In a dual-circuit embodiment of the motor pump unit, a support ring is mounted with spacer elements containing pressure channels on the transverse wall of the outer housing, and connected via a steel pipe section with a second connection channel with the hydraulic connection area. This modular concept for creating different versions of motor pump units requires complex processing and assembly steps each on the entire outer housing, only to make the transverse wall according to the requirements, and relatively many modular parts, which z. B. logistically difficult to control in terms of storage.

Diverse, for example, fields of application of such motor pump units are mobile high-pressure hydraulics, machine tools, portable or mobile hydraulic devices, sun-state Nachvorrichtungen of solar generators, or the like. There is a large range of such motor pump units, for example, in terms of performance, the filling volume, the useful volume, the assembly with pump elements, the Einsatzdruckbereiche, the dimensions of the items and the like. Different. This leads to it Demand for a modular design that can be created with as few simple basic components, logistically simple, and in terms of storage well manageable different motor pump units in a universal manner.

At the EP-A-0284746 known motor pump unit, the support plate is screwed to the heat transfer ring made of a light metal alloy outer housing. The support plate is prepared for mounting a plurality of radial piston pump elements, which are connected on the pressure side via a separately mounted from the support plate pressure collecting annular channel with the arranged in the outer housing hydraulic connection area. Since the support plate is arranged at a relatively short distance from the open end of the outer housing, with an outer housing type no assembly of the motor pump unit with a gear pump element or with larger radial piston pump elements is possible. Rather, then another outer housing as well as another support plate is required, and also the pressure-side connection of the respective pump element with the outer connection area must be tailored.

The end EP-A-0940578 known motor pump unit has a molded into the solid outer housing inner mounting flange for a plurality of distributed around the motor shaft arranged radial piston pump elements, which are connected via a separately formed and installed between the pump elements Druckringsammelkanal with the connection area of the outer housing. When fitting the motor pump unit with other pump elements, the pressure channel must be redesigned and installed. The electric motor is inserted with an encapsulation from above into the outer housing and fixed to the flange of the outer housing.

At the US Pat. No. 6,589,029 B1 known motor pump unit is a solid bottom part inserted into the outer housing from below. The bottom part supports the motor shaft and serves to mount the pump elements. Furthermore, the external connection area is formed in the bottom part and connected to the pressure channel formed in the bottom part.

At the EP-A-0198250 known motor pump unit is inserted between the outer housing and a bottom-side closure lid a massive plate in which the motor shaft mounted and on which the radial piston pump elements are mounted. The external connection area in the plate is connected to the pump elements via pressure channels formed in the plate on the inside.

At the DE-A-3838689 known motor pump unit is used in the open end of the outer housing solid ground for mounting the motor shaft and for mounting different types of pump elements. The bottom has the external connection region and internal pressure channels, which are connected to mounting regions for, for example, radial piston pump elements or a gear pump element. The different pump elements can either be mounted or in combination. In this case, the gear pump element is either exposed to the ground or in a flanged on the ground additional container. Different gear pump elements of a construction series can be optionally mounted. Furthermore, the floor can be built like a box for different embodiments of motor pump units.

The invention has for its object to provide a motor pump unit of the type mentioned above, which consists of a few, easy to manufacture and assemble components and is modular expandable or universally modular expandable in different embodiments.

The stated object is achieved with the features of claim 1.

In the motor pump unit, the simply formed support plate is mounted in the outer housing, on which the respective pump element is arranged and connected via the arranged in the support plate pressure channel with the externally accessible connection area of the outer housing via the pipe nipple. In the support plate for at least one gear pump element, the pressure channel is a simple straight bore with a 90 ° branch channel to the pressure outlet of the gear pump. The branch channel opens at a suitable point in the mounting area on one side of the support plate. The mounting area of this support plate fits different gear pump elements. In the support plate for radial piston pump elements, the pressure channel is formed in the interior of the support plate as a pressure collecting ring channel, which includes a connection to the pressure channel mouth and a plurality of opening in a mounting surface for radial piston pump elements puncture channels. The mounting surface may generally be prepared for a larger number of radial piston pumping elements. Unused stitch channels are then blocked. The hole pattern for mounting the respective support plate in the outer housing is the same among the optional support plates. The pipe nipple is part of the pressure channel and connects the connection area in the outer housing with the pressure channel opening in the support plate. It is not a separately produced or installed pressure channel required, and designed the pressure-resistant connection between the terminal portion of the outer housing and the pressure channel in the support plate by means of the pipe nipple easy. The motor pump unit is modular expandable or modifiable by different motor pump elements and / or different support plates are installed in a basic type of the outer housing. The different support plates are the same in terms of their mountability in the outer housing and its connection to the connection area and differ only in terms of Montierbereiche for different pump elements and optionally the pressure channel, the pressure channel mouth can also be standardized and tuned to the pipe nipple. This facilitates storage and avoids logistical problems, because the basic type of the outer housing with the different support plates and the pump elements suitable for these simple, space-saving and clearly prepared and can be combined. In particular, the pipe nipple precludes the need to tailor the pressure channel when the support plate is separate from the outer housing and mounted in the outer housing and has to lead into the outer connection area, whereas an intermediate plate which can be connected to the outer housing preforms the mounting areas for the pump elements and the pressure channel are, and which also has the connection area, for different embodiments of the motor pump units to have to provide a variety of such expensive and expensive to produce intermediate plates. The outer housing formed with the connection region can be produced as a basic type in large numbers in a cost-effective and dimensionally accurate manner, for example, from light metal or a light metal alloy by means of a chill casting process.

Pump elements that are in terms of their delivery principle (gear pumps or piston pumps), z. B., for medium pressure or high pressure applications, and / or their design and / or performance differ, can be optionally combined with the support plates.

The pipe nipple can be installed so that an outboard end in the connection area is approximately flush, while its other end engages with an appropriate coverage in the pressure channel mouth of the support plate. The coverage should expediently have a dimension that corresponds approximately to the outer diameter of the pipe nipple. The pipe nipple used with seals also compensates for any occurring Relative movements between the support plate and the inner wall of the outer housing, for example caused by vibrations and / or thermal influences.

Due to the high pressures of radial piston pump elements, the support plate intended for such pump elements is made of steel, while the support plate intended for gear pump elements consists, for example, of light metal or a light metal alloy. The support plates may be castings, machined parts or inexpensively prefabricated moldings.

The Montierbereich the respective support plate in the outer housing may be a flat annular surface, or distributed in the circumferential direction have regular mounting zones for mounting screws. The mounting area for the pumping elements may be different from the mounting area for gear pumping for radial piston pumping elements, and, suitably, a gear pumping element mounting area is a surface which allows the attachment of different types of gear pumping elements selectively.

In an expedient embodiment, a heat transferring ring is integrally formed with the inner wall of the outer housing, which contains at least one oil passage, so that the stored oil in the reservoir can circulate. Further, the heat transferring forms a Statorstecksitz for the stator of the electric motor. In order to increase the rigidity of the outer casing, and also to improve the heat transfer properties, additional ribs may be provided adjacent to the heat transferring ring. The ribs can also be used on one side of the heat transfer ring to form the Montierbereiches for each support plate.

In the outer housing, the connecting channel, in which the pipe nipple is introduced, located at a considerable distance from the open end of the outer housing. This distance can be a multiple of the plate thickness and is chosen so that there is sufficient space for pump elements of different heights and they do not project beyond the open end of the outer housing. Preferably, even between the hydraulic connection area on the outer side of the outer housing and the open end, an electrical connection area or connection box of the motor pump unit is arranged.

In one embodiment of the motor pump unit, the basic type of outer housing determines the filling volume and the useful volume with sealing lids attached directly to the two open ends of the outer housing. With a filling volume of, for example, 12.0 l, a useful volume of, for example, 5.0 l can then be achieved.

In a further embodiment of the motor pump unit with a larger filling volume and larger useful volume, an extension housing is installed between the outer housing and at least one closure lid. For example, an extension to a filling volume of 22.0 l and a useful volume of 14.0 l can be achieved with the same outer housing.

In another embodiment of the motor pump unit, a further identical outer housing of the basic type is installed for expansion, so that, for example, a dual-circuit pump system with the same or different pump element configurations is created which shares the filling volume and useful volume.

In a further embodiment, a cooling fan is mounted on at least one closure lid, which has its own drive motor and provides with ribbed structures outside of the outer housing or on the extension housing for a more intense heat dissipation.

Fig.1

einen Längsschnitt einer ersten Ausführungsform eines Motorpumpenaggregats,

Fig. 2

eine Schnittansicht zu Fig. 1 in einer Schnittebene II von Fig. 3,

Fig. 3

eine Seitenansicht zu Fig. 1,

Fig. 4

einen Längsschnitt analog zu Fig. 1 einer weiteren Ausführungsvariante, und

Fig. 5

einen Längsschnitt einer weiteren Ausführungsvariante des Motorpumpenaggregats.

With reference to the drawings, embodiments of the subject invention will be explained. Show it:

Fig.1

a longitudinal section of a first embodiment of a motor pump unit,

Fig. 2

a sectional view too Fig. 1 in a sectional plane II of Fig. 3 .

Fig. 3

a side view too Fig. 1 .

Fig. 4

a longitudinal section analogous to Fig. 1 a further embodiment, and

Fig. 5

a longitudinal section of another embodiment of the motor pump unit.

In the embodiments of the Fig.1-5 different motor pump units A, for example, a single basic type of a basic housing 1 with the same closure lids 5, 6, optionally identical electric motors E, but different pump elements P and different types of support plates TP1, TP2 used for the pump elements P in modular design to the different embodiments of the motor pump units to realize. In this case, the support plates TP1, TP2 differ from each other by individual adaptation to the mounted pump elements P, wherein gear pump elements Z1, Z2 and radial piston pump elements RK different specifications, designs, power levels and the like. Optionally can be installed. In each embodiment, an inserted pipe nipple N is used to form a pressure channel K from the respective installed pump element P to an externally accessible connection area B of the outer housing 1.

The motor pump unit A in Fig. 1 For example, has a filling volume of about 12.0 l and a useful volume of about 5.0 I. The outer housing 1 is for example a light metal Kokillengussteil (aluminum or aluminum alloy) with an outside at least partially ribs 2 and a largely smooth or ribbed also inner wall 7 and open ends 3, 4, on which the closure cover 5, 6 are mounted.

In the outer housing 1, preferably in one piece with the inner wall 7, a heat transfer ring 8 is provided, which defines a Statorstecksitz 9 for a stator 20 of the electric motor E and on which the Statorstecksitz 9 facing away from a Montierbereich 10 for the respective support plate TP1, TP2 is provided. At least in the area of the heat transfer ring 8 additional ribs 11 may be provided (see also Fig. 2 ).

The in Fig.1 shown type of support plate TP1 is intended for mounting at least one gear pump element Z1 by means of fastening screws 22 and has an overhead example annular mounting area 12 for mounting in the mounting area 10 (with a corresponding hole pattern for mounting screws 28) and on the opposite side a flat Montierbereich 14 for at least one Type of gear pump element Z1. The support plate TP1 has an outer edge 13 which is spaced from the inner wall 7 of the outer housing 1 when the support plate TP1 is mounted in the outer housing 1. In the support plate TP1, the pressure channel 8 is defined by an internal, for example radial bore 15 and one of them branching off at 90 ° to the mounting region 14 branch channel 16, wherein the bore 15 leads to a pressure port mouth 25 with a slightly larger inner diameter, which opens into the outer edge 13 and is aligned with a connection channel 26 in the connection region B of the outer housing 1 in the mounting position of the support plate TP1.

In the support plate TP1, a central passage 17 'for a motor shaft 19 is formed adjacent to a bearing seat 17 for a motor shaft bearing 18. The other end of the motor shaft 19 is mounted in a shaft bearing 21 at the upper end of the stator adjacent to the closure lid 5.

The connection region B is located at a distance from the open end 4 of the outer housing 1. In the outer mouth of the connection channel 24, a widening 27 may be formed, in which an outboard collar of the pipe nipple N engages and limits the insertion depth. From the inner wall 7 may be provided in the direction of the outer edge 13 of the support plate TP1 extending or contacting this skirt 29.

The pipe nipple N is a straight pipe section and has in both end regions outer circumferential grooves 26 for each seal and optionally a support ring. The pipe nipple N is inserted from the outside of the outer housing in the connection channel 24, with its end approximately flush with the connection area B and received at the other end with a cover in the pressure channel mouth 25, wherein the Dimension of the overlap, for example, corresponds approximately to the outer diameter of the pipe nipple N. Between the hydraulic connection region B in the outer housing 1 and the open end 4, an electrical connection region 23, for example a terminal box, may be provided on the outer housing.

The outer housing 1 defines with the closure lids 5, 6 a certain filling volume of an oil reservoir R, for example in Fig. 1 a filling volume of about 12.0 I with a useful volume of about 5.0 I. In the sectional view (section plane II-II in Fig. 3 ) of the Fig. 2 can be seen in the direction of the open end 4 of the outer housing 1, that the support plate TP1 is fixed centrally with, for example, five screws 28, and that the mounting portion 14 for the gear pump element Z1 is an approximately rectangular flat surface on which the gear pump element Z1 is slightly eccentric is fixed with the mounting screws 22. At least in the region of the pipe nipple N covered by the skirt 29 from below, the lower part of the oil reservoir R communicates with the upper part through a connection opening in the heat transferring ring 10. The ribs 11 are, for example, radial ribs.

In the side view in Fig. 3 is indicated that the ribs 2 on the outer surface of the outer housing 1 longitudinal ribs which extend only along the outer housing 1, whereas the closure cap 5, 6 are smooth. On the upper closure lid 5, a cooling fan L is indicated in dashed lines for an alternative embodiment of a motor pump unit A, which has its own drive motor M and thus can be driven independently of the electric motor E, taking advantage of the enlarged surface of the ribs 2 from the heat transferring ring 8 and the outer housing Dissipate 1 outwardly conducted heat. The cooling effect is intensified by the fact that cooler air is blown from above initially along the cooler upper region of the outer housing 1, and the gradually warming air only then sweeps over the hotter lower region of the outer housing 1, so that the temperature difference between the outer surface of the outer housing 1 and the cooling air over the longitudinal extent of the outer housing always remains a minimum. Fig. 3 also shows the connection channel 24 in the connection region B and the pipe nipple N mounted there, which connects the connection region B with the pressure channel K in the respectively mounted support plate TP1.

The embodiment of the motor pump unit A in Fig. 4 is different from that of Fig. 1-3 in that the pump element P1 is opposite to the pump element P in the Fig. 1-3 larger and / or more efficient gear pump element Z2 is that on the support plate TP1 or a correspondingly adapted, other support plate TP1 'mounted is. Here, the connection region of the motor shaft 19 to the gear pump element Z2 can be designed somewhat differently. The outer housing 1, the pipe nipple N and the electric motor E correspond z. B. those of the preceding figures.

In the embodiment of the motor pump unit A in Fig. 5 a plurality of pump elements P are mounted on another support plate TP2, namely, for example, any number of radial piston pump elements RK, which are arranged in a common plane and driven by an eccentric 31 on the motor shaft 19. The support plate TP2 differs from the support plate TP1 of the preceding figures with at least approximately the same outer diameter of the outer edge 13 by a larger, substantially constant thickness and another design of the pressure channel K and the Montierbereiches 14 'for the pump elements P. The pressure channel K is in this case, for a plurality of radial piston pump elements, a pressure collecting ring channel 32, which is transferred into the pressure channel mouth 25 and has a plurality of branch channels 33 opening into the mounting region 14 '. The pressure channel mouth 25 is also here above the skirt 29 of the outer housing 1 via the pipe nipple N with the connection channel 24 in the connection region B connected. The passage area and bearing area for the motor shaft can also be designed specifically.

In the Fig. 1-4 For example, the support plate TP1, TP1 'may be a molded part made of a light metal or a light metal alloy (aluminum) because the pressure of the gear pump element is less than the pressure generated by radial piston pump elements. In Fig. 5 For example, the support plate TP2 is made of steel. The mutually different support plates TP1, TP2 are easy to manufacture and easy to install parts of a kit for modular creation of different embodiments of motor pump units A.

In Fig. 5 is the lower open end 4 of the outer housing 1 (the basic type of the outer housing) closed by the closure lid 6. As a further alternative embodiment, the motor pump unit A in Fig. 5 However, an attached to the upper open end 3 of the outer housing 1 extension part 30, which is closed on the upper side by the closure lid 5. In this way, the filling volume and the useful volume are extended, for example to 22.0 l and 15.0 l.

In a further, not shown, expansion stage of a motor pump unit A either according to Fig. 1 . Fig. 4 or Fig. 5 may be placed instead of the extension section 30 or additionally a second outer housing 1, so that the motor pump unit A is a dual-circuit pump unit, wherein the two pump circuits share the oil reservoir R together. For example, one pump stage may be equipped with radial piston pump elements, and the other with a gear pump element, or vice versa. Similarly, only gear pump elements or only radial piston pump elements could be used in the motor pump unit, possibly different power levels or in different numbers for the pump stages.

In an advantageous embodiment, the height of the motor pump unit according to Fig. 1 with the attached cap about 425 mm with a housing outer width of about 245 mm, while the housing length of the embodiment of Fig. 5 can be about 675 mm. A basic type of pipe nipple N is used for the various embodiments.

Claims (10)

1. Motor pump unit (A) comprising an outer housing (1) forming an oil reservoir (R), at least one electric motor supported in the outer housing (1), at least one gear pump element or radial piston pump element (Z1, Z2, RK), arranged at a pump element mounting region (14, 14') for being driven by the electric motor, a hydraulic connection portion (B) arranged in the outer housing (1), and at least one pressure channel (K) extending from the respective pump element to the hydraulic connection portion (B), characterised in that either a one piece carrier plate(TP1, TP1') having gear pump element mounting region (14), an integrated, knee-shaped pressure channel (K) extending from the gear pump mounting region (14) to a pressure channel port (25) arranged at the outer edge (13) of the carrier plate, and a motor shaft bearing socket (17), or a one piece carrier plate (TP2) having a radial piston pump element mounting region (14'), a pressure channel formed as an interior collecting ring channel (32) and extending to a pressure channel port (25) arranged at the edge (13) of the carrier plate, as well as connecting channels (33) extending to the radial piston pump element mounting region (14'), as well as a motor shaft bearing socket (17) is selectively mounted in a basic type of outer housing and at a mounting region (10) of the outer housing, the respective carrier plate being mounted such that the outer edge (13) respectively is spaced apart from the inner wall (7) of the outer housing (1), that the at least one gear pump element (Z1, Z2) is mounted on the gear pump element mounting region (14) of the carrier plate (TP1, TP1') and is connected to the pressure channel (K), or that on the radial piston pump element mounting region (14') of the carrier plate (TP2) the at least one radial piston pump element (RK) is mounted and connected with the pressure channel (K), and that the pressure channel (K) of the mounted carrier plate is connected with the connection portion (B) by a tube section (N) directly inserted into the pressure channel port (25), which tube section (N) extends within the outer housing (1) through the distance between the outer edge (13) of the carrier plate and the inner wall (7) of the outer housing (1).
2. Motor pump unit according to claim 1, characterised in that the respective mounted carrier plate (TP1, TP1', TP2) has a passage (17') for a motor shaft (19) and is provided at one side and around the passage (17') with the gear pump element mounting region (14) or the radial piston pump element mounting region (14'), and has at the opposite side a mounting region (12) fitting to the mounting region (10) of the outer housing (1).
3. Motor pump unit according to claim 1, characterised in that the carrier plate (TP2) is made inclusive of the radial piston pump element mounting region (14') from steel, and that the carrier plate (TP1, TP1') including the gear pump element mounting region (14) is formed from a light metal-like aluminium or a light metal alloy, and is formed as a machined form part or a cast part, respectively.
4. Motor pump unit according to claim 2, characterised in that the pump element mounting regions (14, 14', 12) are planar surfaces, and that the mounting region (12) has a hole pattern for fastening screws (28) adapted to the mounting region (10) of the outer housing (1).
5. Motor pump unit according to one of the preceding claims, characterised in that a heat transfer ring (8) unitary with the inner wall (7) of the outer housing and being equipped with at least one oil passage and with integrated ribs (11) is forming both a stator press-fit (9) and the mounting region (10) for the respective carrier plate (TP1, TP1', TP2).
6. Motor pump unit according to claim 1, characterised in that in the connection region (B) and distant from an open end (4) of the outer housing (1) a connecting channel (24) is arranged, preferably with a distance corresponding to a multiple of the thickness of the mounted carrier plate (TP1, TP1', TP2), wherein, preferably, an electric connection assembly (23) of the motor pump unit (A) is arranged between the hydraulic connection region (B) and the open end (4).
7. Motor pump unit according to at least one of the preceding claims, characterised in that housing lids (5, 6) are arranged at both open ends (3, 4) of the outer housing (1).
8. Motor pump unit according to claim 7, characterised in that at least one housing extension (30) is provided between the outer housing (1) and at least one housing lid (5, 6).
9. Motor pump unit according to claim 8, characterised in that a second outer housing (1) of the basic type is mounted, having a connection region (B), a second electric motor (E), a second carrier plate (TP1, TP1', TP2), at least a second pump element (P) and a second tube section (N), the second outer housing (1) either forming the housing extension (30) or being mounted in addition to the housing extension (30).
10. Motor pump unit according to at least one of the preceding claims 8 or 9, characterised in that a cooling fan (L) having its own drive motor (M) is arranged on at least one housing lid (5, 6).

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