EP2725230B1 - Piston pump arrangement - Google Patents

Description

State of the art

The present invention relates to a piston pump arrangement with a housing arrangement for a high-pressure delivery of a fluid to be delivered, with a base housing for receiving at least a first pressure generating device and at least one associated control device.

From the prior art, a piston pump assembly with a housing assembly is known in which all the essential components are summarized to generate pressure. To realize a piston pump, e.g. can provide a sufficiently high, predetermined fluid pressure for a high-pressure cleaner, often one to three such piston pumps are combined into a single piston pump assembly in a composite housing assembly.

From the DE 10 2005 037 537 A1 a piston pump is already known, which has a first piston unit and a further compensating piston unit, which are arranged in a common housing.

From the DE 10 2008 043 444 a high-pressure piston pump is known, which has a prefeed pump and a high-pressure pump, which are driven via a common shaft and at least connectable via a connection flange connection.

A disadvantage of the prior art is that such a composite housing assembly has a large footprint, so that the demand for smaller and lighter weight devices that use such a composite housing assembly, with a simultaneous cost reduction is difficult to meet. In addition, for the production of such composite housing arrangements, separate individual housings must be connected to each other and laboriously sealed against each other, resulting in increased sealing and assembly costs, so that a corresponding maintenance and the probability of failure of a thus constructed piston pump assembly can be increased.

Disclosure of the invention

An object of the invention is therefore to provide a new piston pump assembly with a housing arrangement for high-pressure delivery of a fluid to be delivered, with which a respective assembly and sealing costs can be at least reduced.

This problem is solved by piston pump arrangement according to claim 1.

The invention thus makes it possible to provide a universal piston pump arrangement with a housing arrangement, in which a base housing can be combined with optional expansion housings, so that with only two standardized housing designs - with the addition of pressure generating and control devices - piston pump assemblies with different hydraulic performance modularly by the baying or the cascading of these two housing types can be built in the modular principle. With only one base housing or a base housing and at least one expansion housing can thus be e.g. Piston pump assemblies for high-pressure cleaners in the modular principle with different delivery pressures and / or flow relatively easily and inexpensively.

In addition, the housing arrangement allows a space and weight-saving arrangement of the pressure generating and control devices, so that high-pressure cleaner and other devices with small dimensions can be produced at the same time low mass. Furthermore, the modular principle of the housing arrangement allows an optimization of the entire production chain, and thus a significant reduction in production costs. The inventively provided interface in addition to their pure mechanical connection function at the same time has the task of rotatably coupling the arranged in the base housing eccentric drive with the eccentric drive of an expansion housing. The eccentric drive of the base housing may for example be integrally connected to an output shaft of the drive motor. Alternatively, the torque transmission between the drive motor and the eccentric drive in the base housing by means of a preferably axially zusammensteckbaren coupling. The eccentric drive can be cantilevered in the base housing and in the expansion housings, ie the storage takes place as a result solely by the drive motor bearing. In addition, preferably both the base and the expansion housing have corresponding installation space for bearings (eg roller bearings) for mounting the eccentric drive.

Preferably, at least one second pressure generating device and at least one second associated control device can be received in the expansion housing.

As a result, e.g. the hydraulic performance of the piston pump assembly can be doubled by attaching at least one expansion housing to the base housing.

Preferably, a motor flange for attachment of an associated drive motor is formed on the base housing.

In this way, a necessary for the operation of the pressure generating and control devices drive motor can be flanged in a space-saving manner directly to the base housing. A further space saving results from the fact that the preferred two pressure generating and control devices in the always necessary base housing and each other, optional extension housing by means of only one drive motor can be driven.

Preferably, a valve control for controlling the drive motor can be received in the base housing.

As a result, the drive motor may e.g. be turned on or off when reaching a predetermined setpoint for the pressure of the fluid to be delivered.

The at least one expansion housing preferably has at least two connection interfaces, via which the at least one expansion housing can be connected to the base housing and to at least one further expansion housing.

As a result, the base housing with an expansion housing and the expansion housing, where appropriate, in turn mechanically connected to a further expansion housing. As a result of this modular modularity, which follows modularity, cascading of the housing arrangement is possible, so that e.g. Piston pump assemblies having different hydraulic capabilities for high pressure cleaners or the like can be made cost efficient by simply combining a base housing with a suitable number of expansion housings. The connecting interfaces formed in each case in the region of a front and / or rear side of the expansion housing have, in addition to their pure mechanical coupling function, the task of transmitting the torque of the drive motor to the eccentric drive of the base housing and the eccentric drives of the expansion housing coupled thereto. For this purpose, the connection interfaces are e.g. as Flanschschraubverbindungen or as bayonet joints with integrated, preferably axially zusammensteckbaren couplings, such as. Jaw clutches, cross-slotted clutches or front teeth clutch executed.

Preferably, the base housing and the at least one expansion housing each have an installation space for an associated eccentric drive, wherein the associated eccentric drives can be driven simultaneously by means of the drive motor and the installation spaces each have a central axis.

As a result, the modular piston pump assembly can be driven by means of only one drive motor. Preferably, the installation spaces in the expansion housings are designed so that in each case a separate bearing (bearing point) for the eccentric drive is receivable therein, so that a possible low-vibration and low-noise operation is given with minimal wear. Alternatively, only the eccentric drive of the base housing and the eccentric drive can be mounted in the last expansion housing, so that in the intermediate expansion housings no storage is necessary.

According to one embodiment, the central axes lie on a common longitudinal axis and the base housing and the at least one expansion housing are arranged rotated around the longitudinal axis to each other and connected to each other by means of the interface of the base housing.

As a result, a space-saving arrangement of the modular housing is given, at the same time the circumference sufficient space for the hydraulic connection of the pressure generating means and / or the control means of each housing is available. The mechanically fixed connection of the base housing with the at least one expansion housing is in this case preferably by a flange and screw, but can alternatively be done for example by means of a bayonet connection or the like.

In another embodiment, a further expansion housing is arranged rotated about the longitudinal axis and connected by means of its connection interface with the expansion housing.

In this way, in particular the flow rate and / or the flow rate of the constructed in modular principle piston pump assembly can be changed.

Preferably, a rotation angle between the base housing and each expansion housing about the longitudinal axis is in each case an integer multiple of 30 °.

As a result, a sufficient circumferential spacing between the base housing and the expansion housings is ensured, so that a sufficiently large installation space for the hydraulic connection of the pressure generating and control devices with each other and with other components, such as. a suction hose, a Venturi nozzle for the optional supply of additives and a spray lance of a high-pressure cleaner, is available.

The problem mentioned at the outset is also solved by a piston pump for high-pressure delivery of a fluid to be delivered, with a housing arrangement which has a base housing for accommodating at least one first pressure-generating device and at least one associated control device. The base housing has at least one interface, which is designed to allow a connection of the base housing with at least one expansion housing.

Brief description of the drawings

Fig. 1

ein Basisgehäuse für eine Kolbenpumpe gemäß einer Ausführungsform,

Fig. 2

das Basisgehäuse von Fig. 1 mit einem damit verbundenen Erweiterungsgehäuse gemäß einer Ausführungsform, und

Fig. 3

das Basisgehäuse von Fig. 1 mit zwei damit verbundenen Erweiterungsgehäusen gemäß einer Ausführungsform.

The invention is explained in more detail in the following description with reference to exemplary embodiments illustrated in the drawings. Show it:

Fig. 1

a base housing for a piston pump according to an embodiment,

Fig. 2

the base housing of Fig. 1 with an associated expansion housing according to an embodiment, and

Fig. 3

the base housing of Fig. 1 with two associated expansion housings according to one embodiment.

Description of the embodiments

Fig. 1 shows a housing assembly 10 for a piston pump for high-pressure delivery of a fluid, in particular for use in a high-pressure cleaner or the like, which by way of example only a base housing 12 having a top portion 14, a middle portion 16 and a lower portion 18 has. Furthermore, the base housing 12 has two installation spaces 20,22 for receiving in each case a pressure generating and control device, not shown, of the piston pump.

The two installation spaces 20, 22 are illustratively diametrically and mirror-inverted to a central axis 24 of the base housing 12. For better clarity of the drawing, non-designated longitudinal axes of the installation spaces 20,22 are parallel to a vertical axis 26 of the base housing 12, wherein the vertical axis 26 in turn is perpendicular to the central axis 24. The longitudinal axes of the two installation spaces 20,22 can be slightly parallel spaced from the longitudinal axis 26 or coincide with this.

A motor flange 28 having one or more and illustratively four fastening openings 30 to 36 for bolts for fastening a drive motor for the pressure generating devices and the control devices of the piston pump is formed concentrically with the central axis 24. While the motor flange 28 in the region of a front side 52 of the base housing 12 is positioned is in the region of a rear side 54 of the base housing 12 according to the invention an interface formed 56, by means of which an optional extension housing is non-positively connected to the base housing 12, as below Fig. 2 described.

Furthermore, the base housing 12 has in its central portion 16 via a substantially hollow cylindrical mounting space 38 for an eccentric drive, not shown, and its storage. By means of the eccentric drive driven by the drive motor, preferably two pressure-generating devices with their associated control devices are driven simultaneously.

Integral to the base housing 12, an inlet channel 40 and a drain channel 42 are also provided. The inlet channel 40 and the outlet channel 42 are each at least approximately hollow cylindrical or tubular. Via the inlet channel 40, the fluid to be pumped by means of the piston pump is sucked in, and via the outlet channel 42, the fluid under high pressure is delivered to a removal point, not shown, such as a spray lance of a high-pressure cleaner. The flow direction of the fluid to be delivered is symbolized here by respective arrows.

Also provided on the drainage channel 42 is a venturi 44 through which an optional additive, such as e.g. a cleaning agent and / or other auxiliaries, which can be added to the high-pressure fluid. In this case, the additive flows in the direction of an arrow 46 into the Venturi nozzle 44.

In addition, a further installation space 48 for receiving a valve control 50 is formed in the lower section 18 of the base housing 12. By means of the valve control 50, the drive motor, for example, when reaching or exceeding a predetermined target pressure of the fluid to be delivered in the region of the flow channel 42 can be switched off automatically.

Fig. 2 shows an exemplary housing assembly 60 with the base housing 12 of Fig. 1 which is connected to an exemplary expansion housing 62 by means of the interface 56 formed on its rear side 54. This in Fig. 2 Rearward - expansion housing 62 has - apart from the venturi and the installation space for the valve control - essentially the same structural design as the base housing 12. In particular, at least two installation spaces for each pressure generating and control device of a piston pump, an installation space for an eccentric drive and an inlet and outlet channel for the fluid to be delivered are present.

In order to enable the coupling of the expansion housing 62 to the interface 56 of the base housing 12 and thus the modular alignment of the two housings 12, 62, the expansion housing 62 has a connection interface 68 in the region of a front side 66, which can be connected to the interface 56 of the base housing 12 , In this case, by means of the interface 56 on the base housing 12 and the connection interface 68 of the expansion housing 62, on the one hand, a frictional and vibration-proof mechanical connection is created. This necessary mechanical connection can be created for example by means of a flange and screw connection to create a mutual, at least partially positive fit. Alternatively, the interface 56 and the connection interface 68 may be implemented as a mechanical interlock, such as e.g. be designed as a bayonet connection with optional screw protection.

On the other hand, the interface 56, in cooperation with the connection interface 68, ensures the torque transmission between the eccentric drive of the base housing 12 and the eccentric drive disposed within the expansion housing 62 and preferably at the same time. This torque-transmitting function can be realized, for example, by an axially plug-in coupling, such as a dog clutch, a cross-slotted clutch, a front teeth clutch or the like. In order to allow an at least theoretically unlimited expandability or alignability of the housing assembly 60 by adding further expansion housing, the expansion housing 62 in turn in the region of a rear side 70 has a connection interface 72 concealed here. For hydraulic coupling, unillustrated connection lines are needed to hydraulically connect the pressure generating and control devices in the base housing 12 to those of the expansion housing 62 adequately provided by the angle 64 of approximately 90 degrees between the base and extension housings 12, 62 Room for the laying of cables is available.

According to one embodiment, the center axis 24 of the installation space 38 of the base housing 12 and a central axis 74 of the concealed installation space for the eccentric drive in the expansion housing 62 and the eccentric drives of the housing 12,62 on a common longitudinal axis 76, wherein the base housing 12 relative to the expansion housing 62 to the longitudinal axis 76 is illustratively pivoted about an angle 64 of approximately 90 ° or the housings 12, 62 are arranged at an angle 64 about the common longitudinal axis 76 relative to one another.

Since two pressure generating devices with their associated control devices can be accommodated in the base housing 12 and also two pressure generating and control devices can be integrated in the expansion housing 62, the hydraulic performance, in particular the flow rate and / or the delivery pressure of the fluid to be delivered, can be combined with the housing arrangement 60 according to the invention constructed piston pump compared to the housing assembly 10 of Fig. 1 - In the base housing 12 only two pressure generating means with the associated control devices are accommodated - in a simple manner, almost double in the ideal case. In addition, all pressure generating and control devices in the housing parts by means of only one drive motor, which causes the two eccentric drives in rotation, advantageously simultaneously drive.

Fig. 3 shows an exemplary housing assembly 90 with the base housing 12 of Fig. 1 and 2 , the expansion housing 62 of Fig. 2 as well as a - in Fig. 3 rear - extension housing 92, wherein the extension housing 62,92 have the same structural design. The frictional connection between the base housing 12 and the expansion housing 62 takes place as in Fig. 2 described over the hidden connection interfaces 56,68. The coupling between the expansion housing 62 and the expansion housing 92 is effected by the likewise not visible connection interfaces 72 and 94 in the same manner as the mechanical connection between the base housing 12 and the expansion housing 62nd

Center of the installation space 38 for receiving the eccentric drive, not shown in the base housing 12 extends the central axis 24. Accordingly, the central axis 74 of the installation space for the eccentric drive in the expansion housing 62 aligned. The same applies to a central axis 95 of the likewise concealed installation space for the eccentric drive of the expansion housing 92, so that all three installation spaces are substantially aligned with each other and their respective center axes 24,74,95 lie on the one common longitudinal axis 76.

This makes it possible to simultaneously drive the eccentric drives accommodated or mounted in the installation spaces by means of the one central drive motor. In order to achieve the simultaneous drive of all eccentric drives and at the same time to facilitate their assembly, the eccentric drives of the base housing 12 and the expansion housing 62,92 are rotatably connected to each other and to the drive shaft of the drive motor. This rotationally fixed connection also takes place through the interface 56 and the connection interfaces 68,72,94,102, which in addition to their mechanical connection function of the housing parts also have the task of torque transmission between the drive motor and the respective associated eccentric drive. The interface 56 and the other connection interfaces 68,72,94,102 therefore comprise, in addition to a flange and screw connection or a bayonet connection, at the same time an axially plug-in coupling, such as e.g. a dog clutch, a cross-slot clutch, a front teeth clutch or the like.

Alternatively, the mounting of the eccentric drives can only take place in the end-side housing parts, i. be provided in the base housing 12 and in the extension housing 92. In such a constellation, the bearing of the eccentric drive in the expansion housing 62 is eliminated and the eccentric drive can be advantageously removed, e.g. be formed with a one-piece, continuous, only end-mounted camshaft. The camshaft is set in rotation by the drive motor attached to the motor flange 28 and has in the region of each installation space a cam as an eccentric drive for the pressure generating and control devices of the piston pump accommodated in the associated base or extension housing 12, 62, 92.

The expansion housing 62 is - in contrast to the housing assembly 60 of Fig. 2 - By an angle 96 of about 120 ° about the longitudinal axis 76 twisted attached to the base housing 12, whereas the extension housing 92 rotates about an angle 98 of about 60 ° about the longitudinal axis 76 on the expansion housing 62 is attached. This means that the two expansion housings 62 and 92 are arranged rotated by about 60 ° about the longitudinal axis 76 to each other.

Due to the fact that the angles 96, 98 between the housings 12, 62 and 92 are each preferably an integer multiple of 30 °, a particularly space-saving arrangement of the housings 12, 62, 92 results, with at the same time sufficient space for connecting lines to the necessary hydraulic interconnection remains. As a result, with the housing arrangement 90 according to the invention, e.g. extremely high-performance piston pumps for high-pressure cleaners with nevertheless compact dimensions and low weight using only two standard housing designs in the form of the base housing 12 and the extension housing 62,92 modular and therefore cost-effective modular construction.

The housing assembly 90 in this case allows the inclusion of a total of six pressure generating and control devices to create a very powerful piston pump for high pressure delivery of a fluid, the pressure generating and control devices are centrally driven by their respective eccentric drives of only one drive motor. Here can over the in Fig. 3 Housing assembly 90 shown with the base housing 12 and two extension housings 62,92 coupled thereto also housing arrangements are provided, which have more than two expansion housing for receiving pressure generating and control devices in addition to the base housing in order to realize an even more powerful piston pump. For this purpose, a further connection interface 102 is formed approximately centrally in the region of a rear side 100 of the expansion housing 92, which allows a problem-free connection of further expansion enclosures with pressure generating and control devices.

The base housing 12 and the two expansion housings 62, 92 can be produced in particular as a function of the pressure of the fluid to be delivered and other mechanical requirements with an optionally fiber-reinforced plastic, with an aluminum alloy, with a brass alloy or with a combination of at least two of the materials mentioned.

Claims (7)

1. Piston pump arrangement for the high-pressure delivery of a fluid to be delivered, having a housing arrangement (10; 60; 90) which has a base housing (12) for accommodating at least one first pressure-generating device and has at least one associated control device, characterized in that the base housing (12) has at least one interface (56) for the non-positively locking mechanical connection of the base housing (12) to at least one expansion housing (62, 92), wherein the expansion housing (62) has at least one second pressure-generating device and at least one second associated control device for the purposes of varying the delivery rate of the piston pump arrangement which is constructed in accordance with a modular principle by way of the combination of the base housing (12) and of the at least one expansion housing (62), and in that, on the base housing (12), there is formed a motor flange (28) for the fastening of an associated drive motor for the drive of the first and of the at least second pressure-generating device.
2. Piston pump arrangement according to Claim 1, characterized in that a valve controller for controlling the drive motor can be accommodated in the base housing (12).
3. Piston pump arrangement according to one of the preceding claims, characterized in that the at least one expansion housing (62) has at least two connection interfaces (68, 72) by way of which the at least one expansion housing (62) can be connected to the base housing (12) and to at least one further expansion housing (92).
4. Piston pump arrangement according to one of the preceding claims, characterized in that the base housing (12) and the at least one expansion housing (62, 92) each have an installation space (38) for an associated eccentric drive, wherein the associated eccentric drives can be driven simultaneously by way of one drive motor, and the installation spaces each have a central axis (24, 74, 95).
5. Piston pump arrangement according to Claim 4, characterized in that the central axes (24, 74, 95) lie on a common longitudinal axis (76), and the base housing (12) and the at least one expansion housing (62) are arranged so as to be rotationally offset relative to one another about the longitudinal axis (76) and are connected to one another by way of the interface (56) of the base housing (12).
6. Piston pump arrangement according to Claim 5, characterized in that the further expansion housing (92) is arranged so as to be rotationally offset about the longitudinal axis (76) and is connected by way of its connection interface (94) to the expansion housing (62).
7. Piston pump arrangement according to Claim 4 or 5, characterized in that an angle of rotation (64, 96, 98) between the base housing (12) and each expansion housing (62, 92) about the longitudinal axis (76) amounts in each case to an integer multiple of 30°.

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