EP3156660A1 - Domestic water system with centrifugal pump and membrane pressure tank - Google Patents

Abstract

The domestic waterworks has a water inlet port (12), a water outlet port (28), a centrifugal pump (3), an electric motor (5), an electrical / electronic controller, and a diaphragm pressure vessel (30). Centrifugal pump (3) and diaphragm pressure vessel (30) are arranged one above the other and connected to each other via a structural unit (6). The assembly (6) comprises the water connections (12, 28), the line connection between the water connections (12, 28) and the pump (3) and a threaded connector (29) for the diaphragm pressure vessel (30).

Description

The invention relates to a domestic waterworks with a water inlet connection, with a water outlet connection, with a centrifugal pump, with an electric motor driving the centrifugal pump, with a membrane pressure vessel and with an electrical / electronic control.

Such house water plants are state of the art and are used in many ways. A known domestic waterworks of this type is sold by the applicant under the name Grundfos MQ. This domestic waterworks has a housing, which essentially the arrangement of electric motor with a downstream multi-stage centrifugal pump with horizontal, d. H. lying drive axle account. In the area of the centrifugal pump, the otherwise plastic housing is covered with a stainless steel pot, which has a water inlet connection at the front. On the barrel-shaped housing, a cuboid housing part is mounted on the motor side, which surrounds a diaphragm pressure vessel and the electrical / electronic control and the electrical connection. Between this housing part and the cup-shaped stainless steel housing, the outlet port is arranged.

This domestic waterworks has proven itself well, but is also costly to manufacture and assembly due to its elaborate construction.

Against this background, the invention according to the application, the object to improve a generic domestic waterworks constructive, especially in view of the manufacturing cost but also the handling.

This object is achieved according to the invention by a domestic waterworks with the features specified in claim 1. Advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the drawings. In this case, according to the invention, the features specified in the dependent claims and the description in each case but in a suitable combination, the inventive solution according to claim 1 further.

The domestic waterworks according to the invention has a water inlet connection, a water outlet connection, a centrifugal pump, an electric motor driving this and an electrical / electronic control and a membrane pressure vessel. According to the invention, centrifugal pump and diaphragm pressure vessel are arranged one above the other and connected to each other via a structural unit, which has the water connections, the line connections between the water connections and the pump and a connection for the membrane pressure vessel.

The basic idea of the design according to the invention is to spatially concentrate the liquid-carrying parts of the domestic waterworks and to guide them as far as possible in one structural unit. The essential design prerequisite for this is that centrifugal pump and diaphragm pressure vessel are arranged one above the other and connected to each other via this unit, which water connections, the line connections between the water connections and the pump and a connection for the membrane pressure vessel has. The inventive The unit thus combines all the fluid connections of the domestic waterworks, both external and internal. This has constructive advantages, since the other, not liquid-carrying components, both material and constructive can be designed without having to meet the conditions required for the liquid management. Another constructive but also handling technical advantage is the fact that all external water connections are provided on this one unit.

According to an advantageous embodiment of the invention, the assembly not only includes the aforementioned cable guides and connections, but also forms part of the pump housing, in particular includes the suction port of the pump. It is therefore further within the domestic waterworks only the pump surrounding component according to the requirements of the liquid guide to train accordingly.

According to an advantageous embodiment of the invention, the assembly comprises not only the line connections and the above-mentioned line connections, but also a water outlet through which the liquid contained in the domestic water plant can be drained to the extent that the house water plant is frost-proof, without an antifreeze must be filled ,

From a manufacturing point of view, it is particularly favorable if the abovementioned structural unit is designed as a one-piece plastic injection molded part. As a result, the number of components can be reduced, thereby reducing the storage costs and installation costs.

In domestic waterworks, it is state of the art to design these in such a way that after a first filling with water, the otherwise otherwise unsuitable for centrifugal pumps is guaranteed. According to one embodiment of the invention is provided in that the means for self-aspiration, ie the means which are required for generating this self-priming effect, are arranged in the structural unit. This is typically a check valve and an opening with sealing plug, via which the filling can take place.

Advantageously, the assembly also includes such a check valve, which is advantageously arranged in a line section between the pump housing part and the water outlet port and / or the connection for the diaphragm pressure vessel. In this case, this line section for receiving the check valve is advantageously arranged so that it connects radially to the pump housing and is open at the end. This arrangement allows for a compact design on the other hand integration into this unit.

In this case, according to an advantageous embodiment of the invention, the check valve is designed as a cartridge insert, wherein the valve seat of the check valve is arranged in the assembly, preferably in the line section which receives the check valve. The cartridge-like arrangement allows on the one hand, that the sealing body or at least the seal of the check valve can be changed by pulling the cartridge in a simple manner, on the other hand, the opening in the assembly over which the cartridge is inserted or can be removed, as a filling opening for the water can be used. This is to be filled in to enable the auto-suction effect. This opening must be tightly sealed anyway by a suitable closure, expediently by a correspondingly formed on the insertion cartridge sealing plug.

From the handling is particularly advantageous when the water connections are arranged to one side of the domestic waterworks, preferably to one side in the direction of the centrifugal pump axis. This is understood to mean that the water connections are arranged in the direction of the centrifugal pump axis or parallel thereto, that is, in the case of a lying axis, typically on an end wall which is approximately vertically arranged in operation and which is oriented perpendicular to this axis.

It is advantageous if the water connections are formed by threaded connection, to each of which a connection piece component is limitedly movable, in particular pivotally and releasably secured. Such an arrangement is advantageous to compensate for misalignment when connecting to hard wires. Incidentally, the connection piece components can be exchanged in a simple manner in order to be able to be installed with the locally available connection components. Here country-specific features can be considered without major technical effort, since the unit is not included here as such.

It is particularly advantageous if the assembly also includes the connection for the membrane pressure vessel. This is advantageously formed by a threaded connector, wherein the assembly further advantageously comprises support means for fastening and / or for supporting the container.

An advantageously provided for the pressure detection pressure sensor is advantageously integrated via a connection on the pressure side of the unit.

In order to ensure the electrical safety of the domestic waterworks, a grounding connection is provided, which is accessible from the outside and which is arranged in accordance with an advantageous embodiment of the invention in the assembly so that it electrically with the pumped liquid communicates. This ensures that fluid-carrying components are all earthed.

The pump housing has the construction unit side of the suction mouth and a flange, via which it is schraubbefestigbar with an adjoining tubular pump housing part. The pump housing can thus also be advantageously mounted on the assembly, which thus also structurally forms the supporting part of the liquid-conducting components. The other, the house waterworks self-contained housing components can thus be designed largely free and need to have only a small part of supporting function.

Advantageously, centrifugal pump and electric motor on a common shaft, lying advantageously, d. H. is arranged horizontally in operation. For the electronic control, an inner housing is provided, which is preferably arranged above the engine next to the diaphragm pressure vessel. In this arrangement, all the live components of the pump are arranged in the rear housing part, so far from the liquid-carrying components, which is beneficial.

Fig. 1

in stark vereinfachter Darstellung einen Längsschnitt durch ein Hauswasserwerk gemäß der Erfindung,

Fig. 2

in vergrößerter perspektivischer und teilweise geschnittener Darstellung die Baueinheit mit den daran angeschlossenen Teilen,

Fig. 3

in vergrößerter perspektivischer Ansicht die Baueinheit mit der Seite der Wasseranschlüsse, schräg von unten und rechts vorne,

Fig. 4

die Baueinheit gemäß Fig. 3 schräg von unten und links vorne und

Fig. 5

in perspektivischer Ansicht die Baueinheit mit der nach innen gerichteten Seite.

The invention is explained in more detail with reference to an embodiment shown in the drawings. Show it

Fig. 1

in a highly simplified representation of a longitudinal section through a domestic waterworks according to the invention,

Fig. 2

in an enlarged perspective and partially cut representation of the assembly with the parts connected thereto,

Fig. 3

in an enlarged perspective view of the unit with the side of the water connections, diagonally from below and right front,

Fig. 4

the unit according to Fig. 3 diagonally from below and left front and

Fig. 5

in a perspective view of the assembly with the inward side.

The house waterwork, its construction out Fig. 1 it can be seen has a housing enclosing the entire house waterworks 1, which merges down into a foot 2, with which the domestic water plant is on a floor surface and is typically anchored with screws. Within this housing 1, a multi-stage centrifugal pump 3 is arranged, the shaft 4 carries the rotary wheels and extends into an electric motor 5, which drives the pump 3. The shaft 4 is arranged horizontally, ie the longitudinal axis of the drive is horizontal parallel to the contact surface of the foot second

The housing 1 umhaust the domestic water plant essentially on five sides, namely according to Fig. 1 below, above, at the in Fig. 1 right front and at the two in Fig. 1 invisible sides parallel to the paper plane. At the in Fig. 1 left end face, the housing 1 is formed open and is completed by a unit 6, which by a reference to the Fig. 3-5 illustrated one-piece plastic injection molded part is formed.

This assembly 6 has a lower cap-shaped part 7 in the installed position, which near the bottom has an opening 8 which forms the water outlet opening of the domestic waterworks. This opening 8 is provided with an outwardly projecting threaded connector 9, on which a closure plug 10 is sealingly screwed.

At a distance above the opening 9, an opening 11 is provided with outwardly formed threaded connection 12 for the water inlet.

The cap-shaped part 7 is provided on its flat front side with the nozzle 9 and 12, in the circumferential region, however, reinforced with ribs 13. Inwardly, this cap-shaped part 7 of the assembly 6 forms part of the pump housing and comprises the suction mouth 14 of the pump 3. This cap-shaped part 7 has at the end of the ribs 13 a flange-like radial projection 15, via which an inwardly adjoining pump housing part 16 is screwed, which surrounds the centrifugal pump 3 to the drive-side end and through which the shaft 4 is guided sealingly.

At the cap-shaped part 7, a tubular member 17 connects radially upwards, which is formed open at the top, where it is provided with an internal thread, in which a sealing plug 18 is screwed sealingly. The closure stopper 18 carries, via a holder 19 arranged thereon, a valve body 20 of a check valve 21, the valve seat 22 of which is arranged in the tubular part 17.

The holder 19 consists of three extending from the stopper 18 in the direction of the valve seat 22 rods, the end bearing an annular body 23 in which one end of the valve body 20 which is formed there rod-shaped, is guided axially. The other end of the valve body 20 is guided within the tubular part 17 by a guide cross 24. It is between the valve body 20th and the annular body 23, a helical compression spring 25 is arranged, which generates the closing force for the check valve 21. The valve body 20 is equipped in the region of the valve seat 22 with a circumferential groove in which an O-ring 26 is seated, which produces the actual seal.

The arrangement of sealing plug 18, holder 19, valve body 20 and valve seat 22 is designed so that when screwing the sealing plug 18, first the space immediately behind the closure plug 18 is connected to the ambient pressure. Upon further unscrewing the valve body 20 is lifted with the O-ring 26 from the valve seat 22, so that the space behind the check valve 21 is connected to the ambient pressure. Then, when the stopper 18 is completely unscrewed, the holder 19 can be pulled out with the valve body 20 and the O-ring 26 in the manner of a cartridge from this open-top opening of the tubular member 17 of the assembly 6.

Like from the Fig. 1 and 2 it can be seen, the tubular part 17 opens inside the pump housing, but in an area beyond the suction mouth 14, namely in an annular channel 27 which extends from the pressure side of the pump 3 circumferentially within the pump housing part 16. This tubular part 17 thus forms a pressure-side line of the centrifugal pump 3 and is provided at a distance via the threaded connector 12 for the water inlet with a threaded connector 28 for the water outlet. This threaded connector 28 opens into the channel formed by the tubular member 17, between the valve seat 22 of the check valve 21 and the stopper 18. The threaded connector 28 for the water outlet is thus in the operating position on the threaded connector 12 for the water inlet, is the same size and trained and to the same, in Fig. 1 directed to the left end.

At the rear, so directed inward, slightly down to the threaded connector 28 is a threaded into the housing interior threaded connector 29 is provided, which is provided for connecting a screwed onto this threaded connector 29 diaphragm pressure vessel 30 (also called equalizing vessel 30), so that a part the diaphragm pressure vessel 30 is connected to the pressure side of the domestic waterworks. The other side has in the usual way a separated by the membrane 31 closed gas volume 32, which forms a pressure accumulator. Since the diaphragm pressure vessel 30 with respect to the threaded connector 29 is both axially and radially projecting, in particular the Fig. 1 and 2 show, the assembly 6 in addition to the threaded connector 29, two support arms 33 which support the diaphragm pressure vessel 30 and at the ends of which this is additionally secured by screws. The diaphragm pressure vessel 30 is thus arranged above the centrifugal pump 3.

In the area between the threaded connection 28 and 29, a further connection 34 is provided on the tubular part 17, which serves for the integration of a pressure sensor. This connection 34 is one such as is typically used in compact heating systems, so-called gas heating systems.

The threaded connector 28 for the water outlet and 12 for the water inlet each take a nozzle component 35, which is determined by a screwed onto the respective threaded connector 12, 28 union nut 36. This nozzle component 35 is how Fig. 1 can be seen in the area where it sits within the threaded neck 12, 28, formed crowned and provided with an O-ring for sealing, so that this nozzle member 35 can be slightly pivoted to alignment tolerances when connecting a with the nozzle component 35th each to compensate for the connecting line.

Within the assembly 6, an opening 38 for the integration of a contact is provided in the fluid-conducting region, which is electrically conductively connected to a ground terminal, which is led out through the housing 1 and is provided on the outside with a terminal.

The electronics of the domestic waterworks is housed in a separate electronics housing 37 which is disposed above the electric motor 5 and adjacent to the diaphragm pressure vessel 30 and forms part of the housing 1.

As the above description and in particular the sectional view according to Fig. 1 illustrates, in the house waterworks described above, the liquid-conducting components and the live components not only separated as usual, but arranged in separate parts of the housing 1, which practically excludes by design that liquid enters the range of electric motor and electronics housing, even if leaks in Connection areas should occur.

Not only are almost all fluid-carrying lines and connections integrated in the unit 6, but it also includes the constructive configurations required to produce the self-priming effect. Thus, the pump 3 is located below the threaded inlet 12 for the water inlet, which ensures that a basic amount of water always remains in the pump, even if there is no water at the water inlet. In order to fill this water at first start-up of the domestic waterworks or after the winter season, when the water has been drained, the sealing plug 18 is to be removed, which at the same time the valve body 20 of the check valve 21 is removed, so that otherwise secured against backflow through the valve 21 Channel is opened, so that the water filled from above to the bottom can enter the pump, where it is then used to generate the Selbstansaugungseffekts after the closure plug 18 again inserted and thus the check valve 21 is effective.

LIST OF REFERENCE NUMBERS

1

- Casing

2

- Foot

3

- Centrifugal pump

4

- Wave

5

- electric motor

6

- assembly

7

- cap-shaped part

8th

- opening (drain opening)

9

- threaded connector (drain)

10

- sealing plug

11

- opening

12

- threaded connector (water inlet)

13

- ribs of 7

14

- Suction mouth

15

- flange-like projection of 7

16

- Pump housing part

17

- tubular part of 6

18

- sealing plug

19

- Bracket

20

- valve body

21

- Check valve

22

- Valve seat

23

- annular body

24

- Guide Cross

25

- helical compression spring

26

- O-ring

27

- Ring channel

28

- threaded connector (water outlet)

29

- threaded connector (for diaphragm pressure vessel)

30

- Diaphragm pressure vessel / equalizing tank

31

- membrane

32

- Gas volume

33

- Support arms

34

- Connecting piece for pressure sensor

35

- nozzle components

36

- union nuts

37

- Electronics housing

38

- opening for contact

Claims (15)

Domestic waterworks with a water inlet connection (12), with a water outlet connection (28), with a centrifugal pump (3), with an electric motor (5), with an electrical / electronic control, with a diaphragm pressure vessel (30), whereby centrifugal pump (3) and diaphragm pressure vessel (30) are arranged one above the other and are connected to each other via a structural unit (6) having the water connections (12, 28), the line connections between the water connections (12, 28) and the pump (3) and a connection (29) for the Membrane pressure vessel (30). Domestic waterworks according to claim 1, characterized in that the structural unit (6) comprises a part of the pump housing, in particular the suction mouth (14) of the pump (3). Domestic waterworks according to claim 1 or 2, characterized in that the structural unit (6) comprises a water outlet opening (8). Domestic waterworks according to one of the preceding claims, characterized in that the structural unit (6) is designed as a one-piece plastic injection-molded component. Domestic waterworks according to one of the preceding claims, characterized in that the structural unit (6) has means (18, 21) for self-aspiration. Domestic waterworks according to one of the preceding claims, characterized in that the structural unit (6) comprises a check valve (21), which in a line section (17) between the pump housing part and the water outlet port (28) and / or the connection (29) for the diaphragm pressure vessel (30) is arranged. Domestic waterworks according to claim 6, characterized in that the line section (17) for receiving the check valve (21) radially adjoins the pump housing and is open at the end. Domestic waterworks according to claim 6 or 7, characterized in that the check valve (21) is designed as a push-in cartridge, wherein the valve seat (22) is preferably formed in the line section (17). Domestic waterworks according to one of the preceding claims, characterized in that the water connections (12, 28) are arranged to one side, preferably to one side in the direction of the centrifugal pump axis or parallel thereto. Domestic waterworks according to one of the preceding claims, characterized in that the water connections (12, 28) by threaded connection (12, 28) are formed, on each of which a connection piece component (35) limited movable, in particular pivotally, and releasably secured. Domestic waterworks according to one of the preceding claims, characterized in that the connection for the diaphragm pressure vessel (30) has a threaded connector (29) and support means (33) for fastening and / or supporting the container (36). Domestic waterworks according to one of the preceding claims, characterized in that a connecting piece (34) for incorporation a pressure sensor, preferably a replaceable pressure sensor cartridge, is provided on the line section (17). Domestic waterworks according to one of the preceding claims, characterized in that the structural unit (6) has an externally accessible ground connection, which is arranged in the structural unit (6) so that it is electrically connected to the pumped liquid. Domestic waterworks according to one of the preceding claims, characterized in that the pump housing part (7) of the structural unit (16) has a flange (15), via which it can be screw-fastened with an adjoining tubular pump housing part (17). Domestic waterworks according to one of the preceding claims, characterized in that centrifugal pump (3) and electric motor (5) have a common shaft (4) and that the electrical / electronic control in an inner housing (37) above the motor (5) is arranged.

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