Water Pump and Fountain with Pump

Abstract

A water pump with a housing that has a pump housing part provided with an intake opening and an outlet opening and a motor housing part. An impeller with a shaft is rotatably arranged in the pump housing part. An electric motor is received in the motor housing part. The electric motor is an electronically commutated motor with a rotor and coils. In the housing, control and governing electronics for the electric motor are arranged that have a speed detection, a processor, and a data storage device. The electronics are arranged in the motor housing part and potted therein in a water-tight way. An integrated BUS control module is provided. The control electronics and the governing electronics can be arranged separate from one another on different circuit boards.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and details result from the dependent claims and the embodiments of the invention illustrated in the drawings and to be explained in the following. It is shown in:

FIG. 1 schematically a pump according to the invention; and

FIG. 2 schematically the configuration of a waterdisplay device of the conventional type (top left side of the drawing) and, in contrast to this, one using the new pumps according to the invention (bottom left side of the drawing).

DESCRIPTION OF PREFERRED EMBODIMENTS

The water pump illustrated in FIG. 1 has a housing 1 which is subdivided into a pump housing part 2 and a motor housing part 3. The pump housing part 2 has an intake opening 4 providing the water intake and an outlet opening 5 serving as a water outlet. In the pump housing part 2 an impeller 8 is arranged on a rotatable shaft 9. The shaft 9 extends from the pump housing 2 into the motor housing part 3 and into the EC motor provided therein. The EC motor has a rotor 14 fixedly connected to shaft 9 and a stator 12 surrounding it. Preferably, the rotor 14 is of a two-pole configuration and the stator 12 is of a six-pole configuration (or of a two-pole configuration with protective extra-low voltage). This enhances in an optimal cost/benefit ratio the control and governing dynamics of the pump to be described in the following. The shaft 9 is supported in an end shield 10 that shields the motor mechanically relative to the pump housing part 2 and the impeller 8.

Control and governing electronics are also provided in the housing 1 and preferably arranged also in the motor housing part 3 and thus spaced from the water-conveying parts. The control and governing electronics can be potted water-tightly for safety reasons. This holds true also for the stator 12 of the motor. Inasmuch as stator 12 and rotor 14 are separated from one another by a so-called split cage, preferably the entire free motor housing part can be potted in a water-tight way.

In the embodiment illustrated in FIG. 1 the entire power electronics 16 that also comprises the pure control electronics of the pump is arranged on a first circuit board that is proximal to the motor. Arranged on a circuit board 17 that is positioned behind the first circuit board are the governing electronics with microprocessor and data storage device as well as, in the illustrated embodiment, a BUS control module that receives data BUS signals sent from outside the pump to the pump and converts these data to activity of the pump. Between the two circuit boards 16 and 17 mutual information exchange takes place within the pump. The pump is provided with an electric power input 26 and a control line input 27 that is independent from the input 26 and through which the control information is supplied. An electric cable 36 beginning at the electric power input 26 exits from the pump housing 1 while a control data cable 37 connects a control panel 47 to the control input 27. Of course, the two cables 36, 37 can extend within a common casing; however, preferably they are separate from one another in a visually recognizable way so that wrong connections are prevented.

In FIG. 2, the upper left area shows a water display device or fountain device of the conventional type. Several jets or nozzles 50 are controlled by means of their own proportional valve 51 and their own electric lines 55, respectively. For this purpose, the electric lines 55 are connected to an external control unit 57. A central pump 53 is also connected to the external control unit 57 and is connected through pipes 54 to the proportional valves 51 and is always running under full load. The proportional valves 51, controlled by the control 57, release or interrupt water flow to the jets 50.

Underneath a new water display device or fountain device is illustrated that has several pumps 33 according to the invention. They are connected to a common control device in the form of control panel 47. The device has the same number of jets 50 as the conventional device. In contrast to the upper device, in the device according to the invention however each nozzle 50 has correlated therewith its own pump 33. The pumps are connected by control cables 37 to the control panel 47. Even though other control systems are possible, in this connection particularly a standardized BUS system with digital signal transmission is especially preferred. As illustrated, the pumps 33 can be connected to the control panel 47 by means of electric or electronic serial connection.

While in the conventional system a complex control 57 from the exterior is required, in the new system the complete intelligence is residing in the pumps 33, respectively. Wiring expenditure is reduced to a minimum and complex piping is not needed at all. Moreover, pumps with EC motors can be produced inexpensively and have a high efficiency that reduces the running costs. The energy consumption for the novel device is proportional approximately to the speed that is demanded, in accordance with the water flow rate. For example, the conventional device illustrated at the top would have a power input three times as high as a comparable novel device, e.g., 3 kW compared to 1 kW.

The pumps 33 according to the invention have excellent control and governing dynamics enabling a precise control of the pump 33 and thus unexpected effects. The control behavior in the lower range is as precise as in the upper range. This control behavior cannot be achieved with conventional technology.

The specification incorporates by reference the entire disclosure of German priority application 10 2006 041 310.5 having a filing date of Sep. 1, 2006.

While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.

Claims

1. A water pump comprising: a housing comprising a pump housing part and a motor housing part, wherein the pump housing part is provided with an intake opening and an outlet opening;an impeller with a shaft arranged rotatably in the pump housing part;an electric motor arranged in the motor housing part wherein the electric motor is an electronically commutated motor with a rotor and coils;control and governing electronics for the electric motor arranged in the housing and comprising a speed detection, a processor, and a data storage device.

2. The water pump according to claim 1, wherein the control and governing electronics are arranged in the motor housing part.

3. The water pump according to claim 1, wherein the control and governing electronics are potted water-tightly in the housing.

4. The water pump according to claim 1, wherein the control and governing electronics comprise control electronics and governing electronics that are spatially separated from one another and arranged on separate circuit boards.

5. The water pump according to claim 1, comprising an integrated BUS control module.

6. The water pump according to claim 1, comprising an electric power input and a separate control line input.

7. The water pump according to claim 1, wherein the speed detection comprises a speed sensor for detecting a rotor position of the rotorand a rotary frequency of the electric motor.

8. The water pump according to claim 1, wherein the speed detection is configured without sensor and measures an induced current flow on the coils that momentarily are not supplied with current, respectively.

9. The water pump according to claim 1, wherein the data storage device comprises different programs for different types of pump operation which programs are called up from the exterior.

10. A water display device comprising: several water jets;several water pumps according to claim 1;a common control device to which the water pumps are connected.

11. The water display device according to claim 10, wherein the water pumps are connected to the control device by serial connection.

12. The water display device according to claim 10, wherein the water pumps each are connected to a separate one of the jet elements.