EP2211057B2 - Pump device - Google Patents

Abstract

Pump device (1) comprises an integrated drive motor (2) with a fluid pump (3) on one side and an integrated pressure container (7) on the other side. The drive motor and pressure container are arranged in a spatially compact manner and are connected together. Preferred Features: Fluid line sections of a fluid line running between the motor and container are connected by a fluid-tight connection (8, 9). The fluid line comprises a shape-stable tubular line as fluid line section. A pressure switch (6) is assigned to a run-off channel (4) on the pressure side.

Description

The invention relates to a pump device with a drive motor and a fluid pump coupled to it, which has a pump housing with at least one suction-side inlet channel and one pressure-side outlet channel, and with a pressure vessel that is communicatively connected to the outlet channel of the fluid pump.

Such pump devices, which are also referred to as automatic domestic water machines, are known from the prior art. They serve to convey a fluid, in particular drinking or service water, from a source or from a storage vessel into a water supply network, which can be provided, for example, to supply a building and / or a garden. Such a pumping device is, for example, from DE-29909020-U1 known. The subject matter of claim 1 is delimited in two-part form from this publication. The pumping device has a drive motor, which can in particular be designed as a mains-operated electric motor, and a fluid pump coupled to it. The fluid pump is typically designed as a single or multi-stage self-priming centrifugal pump and comprises an impeller which is received in a pump housing and which can be driven by the drive motor. A suction-side inlet channel and a pressure-side outlet channel are attached to the pump housing, which enable an inflow of fluid to the pump wheel and an outflow of the fluid pressurized by the pump wheel, for example into the water supply network. A pressure vessel is connected to the discharge channel and communicates with the pressurized fluid. The pressure vessel is provided in order to prevent the drive motor from being switched on and off frequently due to the loss of pressure in the event of any leaks in the water supply network. The pressure vessel, which is designed as a pressure accumulator, provides a limited volume of fluid which is pressurized by means of the fluid pump and which ensures an essentially constant water pressure at least when small amounts of fluid flow out into the water supply network. In known pump devices, flexible lines for hydraulic or electrical coupling and to compensate for mechanical positional tolerances are provided between the fluid pump and the pressure tank.

The object on which the invention is based is to create a pumping device that ensures simplified manufacture and more reliable function.

This object is achieved by a pump device according to claim 1, in which at least two functional assemblies are provided, in which the drive motor with the fluid pump on the one hand and the pressure vessel on the other hand are integrated, the functional assemblies being spatially compact to one another and connected to one another. Between the drive motor with the fluid pump and the pressure vessel, defined interfaces are provided for a fluid-carrying connection, which can be produced without additional, especially flexible adapter parts, as used in known pump devices to compensate for tolerances, and thus the desired spatially compact arrangement of the Ensure functional modules to each other.

In an embodiment of the invention, it is provided that fluid line sections of a fluid line running between the at least two functional assemblies are connected to one another by at least one fluid-tight plug connection. By means of plug connections, which already ensure a fluid-tight connection between a plug-in receptacle and a pipe section designed to be plugged into the plug-in receptacle, an advantageous assembly of the functional assemblies can be achieved. The plug-in receptacle and the correspondingly designed pipeline section of the functional assemblies to be connected, which in particular can each be integrally formed on the functional assemblies, are plugged together during the final assembly of the pumping device and directly form the fluid-tight connection during the plugging process. This can be achieved in particular by providing corresponding sealing surfaces and sealing means such as sealing rings, which come into operative connection during the plugging process, on the plug-in receptacle and the pipe section.

In a further embodiment of the invention, the functional assemblies are assigned a plug-in receptacle and / or a pipe section for a coaxial, in particular detachable plug connection in the direction of a central longitudinal axis of a volume section delimited by the plug-in receptacle and the pipe section. A space-saving and reliably sealing arrangement of the sealing means, in particular circularly circumferentially around the volume section delimited by the plug-in receptacle and the pipe section, can thus be achieved. The pipe section and the plug-in receptacle can have a circular, non-circular or polygonal cross-section in a cross-sectional plane arranged orthogonally to the central longitudinal axis of the volume section. The plugging process between plug-in areas of the pipeline section and the plug-in receptacle takes place at least essentially in that direction in which the fluid can flow through the plug-in area. In an advantageous embodiment of the invention, the plug-in receptacle and the plug-in area of the pipe section are provided for a detachable plug-in connection. This facilitates the replacement of individual functional assemblies, for example in the event of a repair, so that the pump device can be repaired inexpensively in the event of damage.

In a further embodiment of the invention is the Plug connection assigned at least one safety device for a mechanical lock. The securing device mechanically couples the pipeline section and the plug-in receptacle with one another in order to avoid undesired separation of the plug-in connection, for example due to pressure loads, vibrations or other external influences. The mechanical coupling of the plug-in receptacle with the pipe section can in particular be effected by a U-shaped securing clip, which is pushed on orthogonally to the central longitudinal axis of the volume section delimited by the plug-in receptacle and the pipe section in the plug-in area and creates a form fit. A reliable mechanical coupling, which can preferably be produced and / or released without tools, can be ensured by a contour of the securing clip that is adapted to the pipeline section and / or the plug-in receptacle.

In a further embodiment of the invention, the fluid line comprises at least one dimensionally stable pipe as a fluid line section. A compact design of the pumping device can be achieved through the use of dimensionally stable pipelines, since dimensionally stable, preformed pipelines, compared to flexible hoses, which must not fall below a minimum radius of curvature, enable a stronger deflection of fluid flows in a smaller space. An assembly of the pipelines is simplified since dimensionally stable pipelines are easier to handle than the pliable hose sections known from the prior art, in particular with regard to the exertion of assembly forces on the plug-in area or areas. By using dimensionally stable pipelines, the final assembly of the pumping device can also be automated, since the pipeline or the functional assembly provided with the pipeline can be gripped, for example, by an industrial robot and the position of the plug-in area or areas is fixed by the dimensionally stable design, so that a automated plugging process can take place. In the case of dimensionally stable pipelines, the pipeline section and / or the plug-in receptacle, which are necessary for a simple, tight and possibly detachable plug connection, can be molded directly, in particular in one piece. It is not necessary to press on hose sleeves or to create a plug-in area in any other way. This ensures greater reliability of the connections between the pipeline, pipeline section and plug-in receptacle. In an advantageous embodiment of the invention, at least essentially all functional assemblies are connected to one another in a hydraulically communicating manner by means of dimensionally stable pipelines, which can in particular be designed as plastic parts.

In a further embodiment of the invention, a further functional assembly includes a pressure switch which is assigned to the discharge channel on the pressure side. The pressure switch is provided for pressure-dependent switching on and off of the drive motor and enables the drive motor to be activated in the event of a pressure loss in the water pipe network in order to convey fluid into the water pipe network and thus ensure an essentially constant fluid pressure in the water pipe network. A pressure loss in the water supply network can be caused, for example, by drawing water from a tap such as a tap. If the fluid contained in the pressure accumulator has flowed off due to leaks in the water supply network or due to the withdrawal of water at a tap and the pressure in the water supply network drops as a result, the drive motor is activated by the pressure switch and the fluid pump again pumps fluid into the water supply network and the pressure accumulator.

In a further embodiment of the invention, a rigid pressure line is provided on the drainage channel, which is designed for a communicating connection of the drainage channel to the pressure switch and / or a manometer. A separate pipeline designed as a rigid pressure line enables different pressure switches and / or manometers to be individually adapted to the pumping device. The pump device can thus be adapted in a simple manner to different areas of application. Corresponding plug-in receptacles and / or pipe sections are provided on the pressure line, on the drainage channel and on the pressure switch, so that automated assembly can also be provided.

In a further embodiment of the invention, at least one check valve is arranged in the inlet channel, which check valve is designed to block a fluid pressure that can be applied by the fluid pump. The check valve prevents the fluid pressure built up by the fluid pump from dropping as a result of fluid flowing out into the inlet channel. The check valve is in particular provided with a pre-tensioned return spring and is designed in such a way that when the fluid pump starts up, it opens the inlet channel due to the negative pressure created in the pump housing and enables fluid to flow from the source or the storage vessel. By integrating the check valve in the inlet channel, a compact, reliably fluid-tight and flow-favorable arrangement of the check valve can be ensured compared with check valves to be attached externally.

In a further embodiment of the invention, the check valve is assigned an actuating device which is provided for pressure-independent control of the check valve. The actuation device is provided in order to facilitate the suction process of the fluid pump, which would otherwise be impeded by the typically closed check valve, when the pump device is reinstalled, in particular when the fluid pump is not filled. The actuation device allows manual or automatic The check valve is opened by an associated operating lever or an automatic control device. With the pressure-independent control of the check valve, the flow resistance for the fluid is reduced so that the fluid pump can self-priming. In a preferred embodiment of the invention, the actuating device is arranged in the inlet channel so as to be rotatable about a pivot axis which is arranged orthogonally to the central longitudinal axis of the inlet channel. An advantageous control of the check valve in the direction of the central longitudinal axis of the inlet channel can thus be achieved by means of a pivoting movement of the actuating device. In addition, with such an arrangement of the actuating device, only a slight influence is exerted on the flow resistance for the fluid in the area of the check valve.

In a further embodiment of the invention, a filter assembly is provided as a further functional assembly, which has an in particular sleeve-shaped filter device in the inlet channel. The filter device prevents damage to the fluid pump by particles contained in the fluid, such as grains of sand, for example. The integration of the filter device into the inlet channel enables a particularly compact design and ensures a particularly favorable and low-loss flow through the filter device. In a preferred embodiment of the invention it is provided that the filter device is designed for a radially inwardly flowing fluid flow and that a cup-shaped collecting container is assigned to an end region of the filter device.

In a further embodiment of the invention, at least one end plug is assigned to the inlet channel, which end plug is provided for closing an access to the check valve and / or the filter device. Maintenance of the filter device and / or the non-return valve is thus facilitated, since only the end plug has to be removed from the inlet channel, which can in particular be done without tools. The filter device and / or the check valve are then accessible for maintenance work or can be removed from the inlet channel in order to be able to carry out maintenance work. In a preferred embodiment of the invention, the check valve and the filter device are each assigned an end plug so that, for example, the check valve can be removed from the inlet channel in the vertical direction downwards, while the filter device can be removed in the vertical direction upwards.

In a further embodiment of the invention, the drive motor and the pressure switch are each assigned correspondingly designed multiple plug devices for a releasable electrical connection. The multiple plug devices enable all electrical connections to be created between the drive motor and the pressure switch with one plugging process, so that the pressure switch can be coupled or uncoupled from the drive motor without complex cabling work. In addition to the assembly or disassembly of the pressure switch on the drive motor, this also improves the test option for these two functional assemblies during the manufacturing process, since only the plug connection between the drive motor or the pressure switch and a suitable test device has to be established for test processes.
In a further embodiment of the invention, a flexible membrane is fixed to the pressure vessel by means of a flange section which has a plug-in device with a fluid channel for a communicating connection between the drain channel and a compensation space enclosed by the membrane. The flange section thus ensures the fastening of the membrane to the pressure vessel as well as the communicating connection with the discharge channel of the fluid pump. For this purpose, a fluid channel is provided in the flange section, starting from the plug-in device, which opens into the compensation space enclosed by the membrane. The plug-in device enables an assembly-friendly plug connection of the flange section with the correspondingly designed drainage channel. In a preferred embodiment, the flange section is formed in one piece on the drainage channel and is designed in particular as a plastic injection-molded part.

In a further embodiment of the invention, at least two drainage channels are provided on the pump housing, at least one of which is designed in the manner of a siphon and / or has a vent valve arranged above the fluid pump. When the fluid pump is started up, the vent valve enables a simplified initial filling in which the air enclosed in the fluid pump has to be displaced by the fluid in order to achieve an adequate pumping effect. Typically, the pump device is already connected to the water supply network when it is put into operation, so that the air contained in the fluid pump cannot simply flow off into the environment. The vent valve arranged and opened above the fluid pump allows the enclosed air to escape when it is filled with the fluid.

According to the invention, the functional assembly comprising the pressure vessel has a frame which surrounds the pressure vessel, which has at least one standing surface and which is provided with at least one mounting surface for connection to the functional assembly comprising the fluid pump. With the frame, the pressure vessel, which is typically designed as an essentially cylindrical hollow body, can be provided in a simple manner with the standing surface necessary for a secure stand of the pump device and with the assembly surface for secure and reproducible attachment of the fluid pump. The frame surrounds the pressure vessel in a form-fitting manner and can be screwed to the screw socket of the pressure vessel. The standing surface or several feet ensure that the pressure vessel stands securely on the ground. The mounting surface enables the fluid pump to be easily and precisely positioned on the pressure vessel, which also ensures that the plug-in receptacles and the associated pipeline sections of the functional assemblies, in particular the drainage channel and the flange section, are flush with one another and can be easily connected to plug-in connections that can be sealed.

The mounting surface is provided on an upper frame part as an interface for a bearing plate. In a further embodiment of the invention, the drive motor is attached to the end shield, which is designed at least in sections as a pump housing. This ensures that an exact positioning of the drive motor and a pump wheel attached to the shaft of the drive motor relative to the pump housing can be guaranteed. The fluid pump can therefore be implemented with small positional tolerances, so that a particularly advantageous degree of efficiency of the fluid pump can be achieved. The end shield is provided with a receptacle for the drive motor which, in particular, enables a positive connection between a reference geometry of the drive motor, for example a cylindrical flange, and the end shield. A precisely concentric arrangement of the drive motor with respect to a central longitudinal axis of the fluid pump can thus be ensured. The pump wheel attached to the shaft of the drive motor is thus also aligned concentrically with the part of the pump housing realized in the end shield. Further housing parts can also be provided with reference geometries that can engage in corresponding reference geometries of the end shield and / or the pump housing and can thus also be arranged with small positional tolerances.

In a further embodiment of the invention, a mounting surface for attachment to the frame of the pressure vessel is provided on the end shield, which is designed in particular for a reproducible alignment of the end shield with respect to the pressure vessel, preferably with at least one positioning pin. This also ensures precise positioning relative to the frame of the pressure vessel on the part of the end shield. With a small number and precise design of the interfaces between the functional assemblies, an exact alignment of the functional assemblies with one another can be guaranteed. This enables the use of rigid pipelines, although there may be a static overdetermination between the functional assemblies due to the coupling of the functional assemblies. In view of the small positional tolerances between the functional assemblies, tolerance compensation, which in the prior art is ensured by flexible pipelines, can be achieved solely by the sealing means, for example designed as O-rings.

In a further embodiment of the invention, the drive motor and / or the fluid pump are at least substantially surrounded by an air guide housing which is designed in such a way that contact with moving or hot components of the drive motor is excluded. In cooperation with a radial fan provided on the drive motor, the air guide housing enables a defined flow of cooling air to be generated at least on the outer surface of the drive motor. This ensures an advantageous cooling effect, which has a positive effect on the service life of the drive motor. The design of the air guide housing ensures that contact with hot, moving or possibly live components can be excluded, so that the entire pump device can be operated safely. The openings in the air duct housing necessary for the air duct are either made so small that a test finger used in accordance with the test regulations for a device test cannot penetrate and / or are provided with a labyrinth-like course that the test finger or other objects penetrate deeper, moving or live components can be excluded.

The frame is designed as a plastic injection molded part. In a further embodiment of the invention, the pump housing and / or the bearing plate and / or the air guide housing and / or the flange section and / or the pressure line and / or the pipelines are also made as a plastic injection-molded part. By being designed as plastic injection molded parts, the functional assemblies of the pumping device can advantageously be manufactured precisely in series at low costs. The use of plastic injection molded parts also has advantages in terms of the weight of the pump device and in terms of corrosion resistance. Furthermore, an advantageous thermal and electrical shielding of the functional assemblies of the pump direction can be achieved, so that additional insulation or insulation measures can be dispensed with.

Fig. 1

in perspektivischer Darstellung eine aus mehreren Funktions- baugruppen aufgebaute Pumpeinrichtung,

Fig. 2

in ebener Darstellung eine Schnittansicht der Pumpeinrichtung gemäß Fig. 1,

Fig. 3

in perspektivischer Darstellung die Funktionsbaugruppe Druck- tank,

Fig. 4

in perspektivischer Darstellung das Lagerschild und das Pum- pengehäuse der Fluidpumpe sowie Gehäuseschalen,

Fig. 5

in perspektivischer Darstellung den Druckschalter, das Motor- gehäuse und die Motorabdeckung,

Fig. 6

in perspektivischer Explosionsdarstellung das Pumpengehäuse mit Filtereinrichtung und Rückschlagventil,

Fig. 7

in perspektivischer Darstellung den Flanschabschnitt und

Fig. 8

in perspektivischer Darstellung den Lagerschild mit Drucklei- tung.

Further advantages and features of the invention emerge from the claims and the following description of a preferred exemplary embodiment, which is illustrated with reference to the drawings. It shows:

Fig. 1

a perspective view of a pump device composed of several functional assemblies,

Fig. 2

a sectional view of the pump device according to FIG Fig. 1 ,

Fig. 3

in a perspective view the functional assembly pressure tank,

Fig. 4

in a perspective view the end shield and the pump housing of the fluid pump and Housing shells,

Fig. 5

a perspective view of the pressure switch, the motor housing and the motor cover,

Fig. 6

in a perspective exploded view of the pump housing with filter device and check valve,

Fig. 7

in perspective the flange section and

Fig. 8

the end shield with pressure line in a perspective view.

The ones in the Fig. 1 and 2 The pump device 1 shown is made up of several functional assemblies which are coordinated with one another in such a way that a spatially compact, assembly and functional arrangement can be achieved and, if necessary, an at least partially automated final assembly of the functional assemblies can take place. The pump device 1 has, as functional assemblies, an assembly comprising a drive motor 2 with fluid pump 3, an assembly comprising a pressure switch 6 and an assembly including a pressure vessel 7. The functional assemblies can be mechanically and additionally also hydraulically and / or electrically coupled to one another by means of suitable plug connections, the plug connections between the functional assemblies being designed for simple final assembly and reliable connection of the functional assemblies. Further functional assemblies, which are sub-assemblies, are discussed in greater detail below.

In the Fig. 2 Fluid-tight plug connections 8, 9 for a hydraulic coupling realized as a fluid line between a pump housing 42 and a pressure line 13, between the pressure line 13 and the pressure switch 6, between the pump housing 42 and a corner tube 61 and between the corner tube 61 and a flange section 23 are shown. From the Fig. 2 and the Fig. 5 the design of the electrical multiple plug connection 21, 60 can be seen. From the Fig. 2 , 3 and 8th the design of the mechanical plug connection between the mounting surfaces 29 of the upper frame part 26 and the bearing plate 30 is evident.

As in particular in the Fig. 7 Shown in more detail by way of example for the plug connection between the corner tube 61 and the flange section 23, a plug-in receptacle 8 and a correspondingly designed pipe section 9 are provided for a fluid-tight plug connection between functional assemblies to be connected to one another. The pipe section 9 is in the plugged-in state, as in Fig. 2 shown, encompassed by the plug-in receptacle 8 and has a circular circumferential sealing groove 56 on an outer circumference, into which an O-ring 38 can be inserted. This ensures a sealing effect between the pipe section 9, the O-ring 38 and an inner surface of the plug-in receptacle 8. The plug connection is produced in the direction of the central longitudinal axis 10 of the respective volume section delimited by the pipe section 9 and the plug receptacle 8. For the corner tube 61 are in the Fig. 7 exemplary plug-in directions indicated with arrows. In order to ensure a pressure-proof plug connection between the plug-in receptacle 8 and the pipe section 9, a likewise circumferential securing groove 55 is provided on the pipe section immediately behind the circumferential sealing groove 56, into which a U-shaped securing clip 57 can be inserted. The securing clip 57 can be inserted orthogonally to the plug-in direction into a slot 58 of the plug-in receptacle 8 and creates a form fit between the plug-in receptacle 8 and the pipe section 9. The plug-in receptacles 8 and pipeline sections 9 molded onto the functional assemblies means that additional work, such as pressing hose sleeves onto high-pressure hoses, is no longer necessary, so that the plug-in connection is significantly more favorable than other types of connection between the functional assemblies in terms of operational reliability, in particular with regard to leaks.

The electrical multiple plug connection provided between the drive motor 2 and the pressure switch 6 is in the Fig. 2 and 5 shown in more detail. The multiple plug device is designed as a four-pole electrical connection between a multiple plug socket 21 of the pressure switch 6 and a multiple plug 60 of the drive motor 2 and enables electrical currents and voltages to be transmitted from the pressure switch 6 to the drive motor 2.

The Indian Fig. 2 The drive motor 2 shown in more detail is an electric motor of known design with a motor shaft 33 which is supported by ball bearings 39 and to which a fan wheel 35 and a pump wheel 36 are attached at each end. The pump wheel 36 has an essentially disk-shaped outer contour and is provided with guide vanes 41, which are provided for conveying the fluid in a radially outward direction when the pump wheel 36 rotates. The pump wheel 36 is accommodated in a pump chamber 43 formed by a bearing plate 30 and a pump housing 42 and thus enables a fluid to be conveyed from an inlet channel 5 to an outlet channel 4.

The one in the Fig. 4 and 8th In addition to its function as a delimitation of the pump chamber 43, the bearing plate 30 shown in more detail is also provided as a receptacle for a mounting flange 44 of the drive motor 2 and has for this purpose an essentially cylindrical recess 63 into which the mounting flange 44 of the drive motor 2 can be inserted concentrically. This makes it possible to achieve an advantageous alignment of the drive motor 2 and the pump wheel 36 attached to it with respect to the pump chamber 43 which is at least partially delimited by the bearing flange 30. This ensures that the pump impeller 36 has only small positional tolerances with regard to the pump chamber 43, as a result of which an advantageous, tightly tolerated design of the fluid pump 3 can be achieved. The pump housing 42 has a mounting collar on the end face which is adapted to a circumferential mounting flange 62 provided on the bearing plate 30 and thus enables the pump housing 42 to be positioned exactly with respect to the pump wheel 36. A mounting surface is provided on an underside of the end shield 30, which is designed to correspond to a mounting surface 29 provided on the upper frame part 26 and has positioning pins 31 that are designed for reproducible mounting on guide sleeves 53 of the upper frame part 26. The bearing flange 30 is preferably locked on the mounting surface 29 by means of screw connections (not shown). An opening is provided on the bearing flange 30 for the passage of the pressure line 13, which hydraulically connects the discharge channel 4 with the pressure switch 6 in a communicating manner. The pressure line 13 is provided at each end with a plug-in receptacle 8 and a pipe section 9 and also has a branch for connecting a pressure gauge 14. The pressure line 13 is attached to the bearing flange 30 below the drive motor in such a way that the pressure switch 6 can also be mounted under the drive motor 2 in a protected position and is not damaged even in the rough operating conditions of the pump device 1.

A plurality of fluid channels 45 are provided in the pump housing 42, which are coordinated with one another in such a way that a fluid flow according to the Venturi principle can be generated when the pump wheel 36 is in operation, so that with the only single-stage fluid pump, a fluid pump that is sufficient for most applications of the pump device 1 Pressure level is achievable.

In an end area of the pump housing 42 facing away from the drive motor 2, the inlet channel 5 is provided, which is equipped in the form of a subassembly with a filter device 17 and with a check valve 15. The filter device 17 has a filter network 47 which is supported by a support structure 46 and through which flow can flow in the radial direction from the outside inward to a central longitudinal axis of the filter device 17. Dirt particles in the fluid which are retained on the filter net 47 can sink down into the collecting container and are thus removed from the flow path of the fluid. The fluid freed from dirt particles can then flow off at a front lower end of the support structure 46 through a bore in the direction of the check valve 15.

To the provided with a preloaded compression spring, in the Fig. 2 To open the non-return valve 17 shown in the closed rest position and to enable a fluid flow into the pump chamber 43, there must be a pressure difference between the fluid in the inlet channel 5 and the fluid in the pump chamber 43, which when the fluid pump 3 is filled with fluid by the movement of the Pump wheel 36 can be generated. The check valve 15 is assigned an actuating device 16 which is arranged to be pivotable orthogonally to the central longitudinal axis of the filter device 17 and which has a switching cam 48 which, in a rest position, as in FIG Fig. 2 is shown, has no mechanical contact with the check valve 15. In a functional position, not shown, pivoted by 90 °, the switching cam 48 acts on an end region of the check valve 15 in such a way that the check valve 15 is removed from the position shown in FIG Fig. 2 shown rest position is brought into an open position. In this way, when the pumping device 1 is reinstalled, the suction of fluid through the inlet channel 5 can be facilitated, since the closing force of the check valve 15 does not have to be overcome.

A filter cover 19 and a valve cover 20 are provided at each end of the inlet channel 5, each of which closes the inlet channel 5 and can be removed without tools to allow a user access to the filter device 17 or to the check valve 15, for example for maintenance or cleaning purposes. A screwable vent valve 25 is attached to the drainage channel 4, which makes it easier to fill the pump device 1 already connected to a water supply network, since the air displaced by the fluid from the pump chamber 43 can escape and the pump chamber 43 is thus filled with fluid when the fluid pump 3 is started and can provide an advantageous pump performance.

As from the Fig. 1 , 2 and 3 can be removed, the pressure vessel 7 is essentially designed as a cylindrical pressure vessel and has a circular opening at the end through which a membrane 22 made of elastic material can be introduced into the volume section around which the pressure vessel flows. The membrane 22 is in the Fig. 3 and 7th The flange section 23 shown in more detail is fixed on the outside of the pressure vessel 7, the flange section 23 being provided with a fluid channel 49 which is provided for a communicating connection with a drain channel 4 attached to the pump chamber 43. At the end, the flange section 23 is closed with a drain plug 50, which allows the pump chamber 43 to be emptied in order to carry out maintenance and repair work. The membrane 22 fixed by the flange section 23 encloses a compensation space 24 which serves as a reservoir for pressurized fluid during the operation of the pumping device 1.

The pressure vessel 7 is, as in Fig. 1 and 3 Shown in more detail, positively surrounded by a frame consisting of an upper frame part 26 and a lower frame part 27, each of which is attached to screw connector 51, as shown in FIG Fig. 2 are shown, is screwed. According to the representation of the Fig. 3 Stand feet 28 are formed in one piece on the lower frame part 27, which feet 28 enable the pump device 1 to stand securely on an at least substantially flat surface and which are provided with screw holes for stationary attachment of the pump device 1. At the feet 28, as in the Fig. 1 shown, damping elements 52 are attached, which can be made of an elastic material such as rubber or rubber and are provided for a vibration decoupling of the pump device 1 from the ground. A mounting surface 29 designed as an interface for the bearing plate 30 is provided on the upper frame part 26, which enables a reproducible positioning of the bearing plate 30 by providing positively acting positioning geometries, such as guide sleeves 53. The upper frame part also has a handle 72 for easy transport of the pump device 1.

The exact positioning of the end shield 30 relative to the pressure vessel 7 enables the use of plug-in connections with rigid pipe sections 9 and rigid plug-in receptacles 8 and of rigid pipes such as the rigid pressure pipe 13 or the rigid corner pipe 61 between the functional assemblies. The exact production of the functional assemblies, in particular using the plastic injection molding process and the positioning means described above, ensure that the plug-in receptacles 8 and the pipe sections 9 come to rest on the respective functional assemblies in such a way that plug-in connections despite the essentially rigid design and the resulting static over-determination are pluggable. The positional tolerances that occur can usually be compensated for by the O-ring 38 provided between the plug-in receptacle 8 and the pipe section 9.

The air guide housing 32 is made up of several components that are connected to one another via snap-in connections. The drive motor 2 is essentially enclosed by a sleeve-shaped motor cover 64 which is provided on the front side with a ventilation grille 65 and which is shown in FIG Fig. 5 is shown in more detail. The motor cover 64 is provided with latching hooks 66 for engaging in housing shells 67, 68 according to FIG Fig. 4 are provided to ensure a positive connection. The task of the fan wheel 35 is to move air over the surface of the in Fig. 5 to move the motor housing 71 shown in more detail and enclosed by the motor cover 64 and thus to effect heat dissipation from the motor housing 71 of the drive motor 2.

The ones in the Fig. 4 Housing shells 67, 68, shown in more detail, of air guiding housing 32 are essentially mirror-inverted and have ventilation slots 69 for the exit of cooling air from drive motor 2 and mounting webs 70 for a positive fit on pump housing 42.

Claims (12)

1. Pump device (1) having a drive motor (2) and a fluid pump (3) which is coupled to the said drive motor (2) and has a pump housing (42) with at least in each case one suction-side inflow channel (5) and one pressure-side outflow channel (4), and having a pressure container (7) which is connected to the outflow channel (4) of the fluid pump (3) so as to communicate with it, at least two functional assemblies being provided, in which firstly the drive motor (2) with the fluid pump (3) and secondly the pressure container (7) are integrated, and the functional assemblies being arranged spatially compactly with respect to one another and being connected to one another, characterized in that the functional assembly which comprises the pressure container (7) has a frame (26, 27) which surrounds the pressure container in a positively locking manner, the frame (26, 27) having at least one base face (28) for standing the pressure container on the underlying surface, and being provided with a mounting face (29) for connection to the functional assembly which comprises the fluid pump (3), in that the frame (26, 27) is configured as a plastic injection-moulded part, in that the mounting face (29) is situated in a freely accessible manner on the outer side of the frame (26, 27), and in that the mounting face is provided on a frame upper part (26) as an interface for a bearing shield (30), and a reproducible positioning of the bearing shield (30) is made possible by providing positioning geometries which act in a positively locking manner.
2. Pump device according to Claim 1, characterized in that standing feet are formed integrally on the base face (28).
3. Pump device according to Claim 2, characterized in that the standing feet are provided with screw holes or damping elements (52) made from an elastic material such as vulcanized rubber or natural rubber.
4. Pump device according to one of the preceding claims, characterized in that the frame consists of a frame upper part (26) and a frame lower part (27).
5. Pump device according to Claim 4, characterized in that the frame upper part (26) has a carrying handle (72).
6. Pump device according to one of the preceding claims, characterized in that the pressure container is provided with screw sockets, to which the frame is fastened.
7. Functional assembly, comprising a pressure container, for a pump device according to the precharacterizing clause of Patent Claim 1, characterized in that the functional assembly has a frame (26, 27) which surrounds the pressure container in a positively locking manner, the frame (26, 27) having at least one base face (28) for standing the pressure container on the underlying surface, and being provided with a mounting face (29) for connection to the functional assembly which comprises the fluid pump (3), in that the frame (26, 27) is configured as a plastic injection-moulded part, in that the mounting face (29) is situated in a freely accessible manner on the outer side of the frame (26, 27), and in that the mounting face is provided on a frame upper part (26) as an interface for a bearing shield (30), and a reproducible positioning of the bearing shield (30) is made possible by providing positioning geometries which act in a positively locking manner.
8. Functional assembly according to Claim 7, characterized in that standing feet are formed integrally on the base face (28).
9. Functional assembly according to Claim 8, characterized in that the standing feet are provided with screw holes or damping elements (52) made from an elastic material such as vulcanized rubber or natural rubber.
10. Functional assembly according to one of the preceding claims, characterized in that the frame consists of a frame upper part (26) and a frame lower part (27).
11. Functional assembly according to Claim 10, characterized in that the frame upper part (26) has a carrying handle (72).
12. Functional assembly according to one of Claims 7 to 11, characterized in that the pressure container is provided with screw sockets, to which the frame (26, 27) is fastened.

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