EP2098647B1 - Connecting fitting - Google Patents

Abstract

A filtering inlet (4) fits near one cross-sectional enlargement (3) and/or directly on it while bordering on a side opposite a reduction of area (2). A filtering outlet (4) fits near another cross-sectional enlargement and/or on it while directly bordering on a side opposite the reduction area. An independent claim is also included for a drinking and domestic water system with floor-by-floor and riser pipe branching.

Description

The present invention relates to a connection fitting with the preamble features of claim 1, as known from EP 1 882 784 A1 is known. The present invention further relates to a drinking and service water system.

In the field of drinking or service water systems, it is known in particular to avoid contamination in the drinking or service water lines to provide a connection fitting of the aforementioned type to arranged in a connected via this connection fitting ring line when removing drinking or service water via a downstream flow direction Consumer to achieve a loop flow. In this case, a partial flow of the strand is led out at the Ausfädelöffnung the connection fitting and passed over the ring line to the at least one connected to the ring line consumer. The ring line opens into the threading of the connection fitting. In the main flow direction of the threading is preceded by a cross-sectional constriction, which acts in the manner of a nozzle and between the discharge and Einfädelöffnung causes a pressure difference, through which a flow is generated in a flow in the strand in the ring line. For the purposes of the present invention, the main flow direction is to be understood as synonymous with the axial extension direction of the strand. As a strand in the context of the present invention, each main line is understood, regardless of whether this extends within a floor and within the floor several successively arranged wet cells supplied via a ring line with drinking or service water, or as riser cabinet, for example, in several stories superimposed Connecting wet cells with each other.

From the DE 39 19 074 A1 For example, a connection fitting of the aforementioned type is known as part of an ultrapure water supply system. In this prior art connection fitting the recirculated from the loop in the strand loop flow is introduced at an angle of about 90 ° to the main flow direction in the connection fitting. The return of the loop flow takes place via a threading opening arranged in a cross-sectional constriction. The threading opening is therefore provided in an area with the lowest pressure. Since the cross-sectional constriction in the manner of a Venturi nozzle acts and causes the above-described pressure difference between the Aus- and Einfädelöffnung, directed by the Ausfädelöffnung to the threading flow when removing drinking or service water. The generated flow is therefore directional. This is the from the DE 39 19 074 A1 previously known connection fitting for drinking or service water systems unsuitable, in which a flow through the strand is provided as needed in one or the other direction.

The from the EP 1 882 784 A1 The prior art connection fitting differs from the above-described connection fitting substantially in that the threading is provided in the region of a diffuser and the recirculation flow recirculated from the loop line is introduced at an angle of not more than 75 ° to the main flow direction. This connection fitting is also unsuitable for a drinking or service water system with intended flow reversal, as in the case of flow reversal desired in the loop purge effect is drastically reduced or no longer exists, so that a flushing of subsequent connected to the strand loops can not be guaranteed safely. Such a flow reversal can occur when the floor or riser pipe is also formed as a ring and the removal of drinking or service water in one of the connected to the floor or riser ring lines a flow in both the upstream and the downstream Connecting fittings causes.

The present invention is based on the problem of specifying a connection fitting for connecting a ring line with at least one consumer on a floor or riser or ring, with a reliable flushing effect of the loop can be achieved even with flow reversal, and to provide a drinking or domestic water system which uses such a connection fitting.

To solve the above problem, the present invention proposes a connection fitting having the features of claim 1 and a drinking or service water system having the features of claim 15. The connection fitting according to the invention is distinguished from the generic connection fitting by a threading, which is adjacent in the region of a cross-sectional widening and / or immediately adjacent to this on the opposite side of the cross-sectional constriction, and by a Ausfädelöffnung, in the region of the other cross-sectional widening and / or at this on the opposite side of the cross-sectional constriction directly is arranged adjacent. The inventive arrangement of the inlet and Ausfädelöffnung allows a flow through the connection fitting in both directions such that a desired flushing effect of the ring lines is ensured regardless of the prevailing flow in the strand. In other words, when removing drinking or service water to a consumer all in the flow direction in front of the strand connected ring lines can be flushed. It has been found to be advantageous that a conditional by the inventive arrangement of the inlet and Ausfädelöffnung pressure loss within the connection fitting, whereby several in the main flow direction one behind the other arranged connection fittings are tunable to each other taking into account a prevailing operating pressure in the strand, so that a sufficient Flushing effect of all loops remains guaranteed. In particular, it has proved to be advantageous for reducing the pressure difference to arrange the Einfädelöffnung in the main flow direction in an area immediately behind the cross-sectional widening, ie in an area in which would normally be expected that the line pressure corresponds to the pressure at the Ausfädelöffnung, whereby a flushing the ring line would be unavailable for lack of pressure difference. However, it has been found that the flow in the region lying immediately behind the cross-sectional widening has a lower pressure than at the discharge opening, so that a pressure difference can be achieved which can ensure a rinsing effect of the loop. Specifically, the cross-sectional constriction upstream of the threading aperture acts as a nozzle, thereby introducing the flow into the downstream diffuser at an increased rate. Although the flow velocity in the diffuser decreases, a certain proportion of the flow with an increased flow velocity flows into the region immediately behind the diffuser and decreases in its flow velocity only in a downstream region to a flow velocity corresponding to the rest of the flow stream. Along with the increased flow rate of this partial flow, the pressure is lower than at the Ausfädelöffnung, whereby the flushing of the ring line causing negative pressure results at the arranged in this area Einfädelöffnung. However, since the pressure difference is small, should preferably acting through the loop to the loop flow flow resistance taking into account the ring line configuration, for example, by adjusting the surface finish of the ring inner wall, the length of the loop, the number of bends or edges are minimized so as to prevent cessation of loop flow.

In a preferred embodiment of the present invention, the threading opening is designed in such a way that the loop stream recirculated from the ring pipe flows in at an inflow angle of not more than 75 ° to the main flow direction. The inflow angle is preferably between 35 ° and 55 ° to the main flow direction. Taking into account the aforementioned inflow, a plurality of connection fittings in a strand in the flow direction can be arranged one behind the other, each effect a flushing of the loop in a flow through the floor or riser without an excessive operating pressure must be expended in the piping system. The flow is thereby with relatively small pressure difference through each individual armature in the region of the strand, i. the main flow out and returned when returning from the loop in the strand streamlined and low loss. Particularly preferably, the inflow angle between 42 ° and 47 ° relative to the main flow direction, which results in a relatively low pressure loss at the threading opening for a relative to the main flow direction aligned recirculated loop flow.

In a further preferred embodiment of the present invention, the connection fitting according to the invention is formed symmetrically with respect to at least one center axis of the cross-sectional constriction, at least with regard to the configuration of the cross-sectional widening and the entry and Ausfüelöffnungen. In particular, the flow leading and forming a flow cross-sectional areas of the cross-sectional enlargements and the inlet and Ausfädelöffnungen symmetrical to form, for example, a lying perpendicular to the main flow direction center axis of the cross-sectional constriction in order for both main flow directions, a substantially identical pressure difference between the input and Ausfädelöffnung to produce a Provide loop flow.

According to a further preferred embodiment of the present invention, the connection fitting comprises a closure body arranged in the cross-sectional constriction and displaceable in the main flow direction. With the closure body, for example, a flow passage area in the cross-sectional widening can be variably adjusted such that a passage area formed between the closure body and an inner wall of the cross-sectional constriction can be displaced by displacing the closure body can be increased or decreased in or against the main flow direction. In this way, a pressure difference adapted to different volume flows for generating a loop flow can be achieved in a simple manner.

According to a further preferred embodiment of the present invention, the closure body closes the cross-sectional constriction at low flow rates up to a critical volume flow substantially sealing. For the purposes of the present invention, a critical volume flow is understood as meaning a volume flow which is sufficient to move the closure body in the main flow direction solely on the basis of frictional and compressive forces acting on the closure body. The aforementioned embodiment has proven to be advantageous in the respect that is passed at an expected low pressure difference between inlet and Ausfädelöffnung upon removal of drinking or service water in the connection fitting completely inflowing flow through the loop. Thus, it is ensured in a simple manner that even in the case of an insufficient pressure difference between inlet and Ausfädelöffnung for generating a loop flow when removing drinking or service water a flushing effect in this and in other connected to the floor or riser ring loops can be achieved.

Preferably, the closure body is elliptical. In this way, a contact surface formed between the closure body and the inner wall of the cross-sectional constriction can be increased in the event of a tight closure in order to further improve the tightness between the closure body and the cross-sectional constriction on the one hand and the critical volume flow as a function of the between the closure body and the inner wall of the cross-sectional constriction acting frictional force and emanating from the volume flow pressure force suitable.

More preferably, the closure body cooperates with at least one return spring acting in the main flow direction. Thus, the closure body can be moved in a simple manner in the main flow direction or pushed back to its original position upon release of the volume flow, wherein the formed between the closure body and the inner wall of the cross-sectional constriction and cross-sectional enlargement passage area adjusted dynamically depending on the volume flow. In addition, a necessary for moving the closure body critical volume flow over the amount of the spring force of the return spring is providable.

Particularly preferably, a point of application of the return spring on the closure body lies in a symmetry axis of the closure body running parallel to the main flow direction, and preferably a force originating from the return spring acts along this axis of symmetry. As a result, a tilting of the closure body to be displaced is encountered, with which the closure body can be displaced more easily in and / or opposite to the main flow direction.

According to a further preferred embodiment of the present invention, at least one return spring acts on the respective ends of the closure body lying in the main flow direction, the resultant force of the return spring acting in the main flow direction being equal to zero in the event of flowlessness. The closure body can thus be securely held in its initial position in flowless. Furthermore, preload-free and / or preloaded return springs can be used. Furthermore, a location of the contact surface formed between the closure body and the inner wall of the cross-sectional constriction can be chosen such that it is closer to or evenly spaced at one or the other cross-sectional widening. As a result, it is possible in particular to provide a critical volume flow value which is determined differently for each of the two main flow directions. It is also possible, if required, to adjust a period of time provided until the passage of flow passing through the cross-sectional constriction is reached.

Further preferred embodiments are characterized by such connection fittings, which can receive a pipe parallel to the main flow direction. This tube is used to connect the return lines of loop lines, e.g. the circulation pipe of drinking water warm, train. Likewise, drinking water cold ring lines can be constructed efficiently in this way.

Fig. 1

eine Längsschnittansicht eines ersten Ausführungsbeispiels einer Anschluss- armatur;

Fig. 2

eine Längsschnittansicht eines zweiten Ausführungsbeispiels einer An- schlussarmatur mit einem die Querschnittsverengung verschließenden Ver- schlusskörper;

Fig. 3 und 4

eine Längsschnittansicht des zweiten Ausführungsbeispiels einer Anschluss- armatur mit einem in Hauptströmungsrichtung ausgelenktem Verschlusskör- per;

Fig. 5

eine Längsschnittansicht eines zu dem in Fig. 1 gezeigten ersten Ausfüh- rungsbeispiel korrespondierenden dritten Ausführungsbeispiels einer An- schlussarmatur mit einem innenliegenden, koaxialen Rohr; und

Fig. 6 bis 8

Längsschnittansichten eines zu dem in Fig. 2 bis 4 gezeigten zweiten Ausfüh- rungsbeispiel korrespondierenden vierten Ausführungsbeispiels einer An- schlussarmatur mit einem innenliegenden, koaxialen Rohr.

Further details and advantages of the present invention will become apparent from the following description of two embodiments in conjunction with the drawings. In this show:

Fig. 1

a longitudinal sectional view of a first embodiment of a connection fitting;

Fig. 2

a longitudinal sectional view of a second embodiment of a connection fitting with a closure body closing the cross-sectional constriction;

3 and 4

a longitudinal sectional view of the second embodiment of a connection fitting with a deflected in the main flow direction closure body;

Fig. 5

a longitudinal sectional view of a to the in Fig. 1 1, which corresponds to a first embodiment of a connection fitting with an inner, coaxial tube; and

Fig. 6 to 8

Longitudinal views of one of the in Fig. 2 to 4 shown second exemplary embodiment corresponding fourth embodiment of a connection fitting with an inner, coaxial tube.

The FIG. 1 shows a first embodiment of a connection fitting, which is designed here as a one-piece component via a primary molding process, in particular a molding and casting process. The first embodiment of the connection fitting is formed symmetrically to a center axis A of a cross-sectional constriction 2 of the connection fitting that is vertical to the main flow direction H. The connection fitting has substantially round flow cross-sections. In detail, the connection fitting of the first and second embodiment comprises a central region in which the cross-sectional constriction 2 and two cross-sectional constriction 2 each end-bordering cross-sectional enlargements 3 are provided. The cross-sectional constriction 2 forms a cylinder section with an inner diameter d forming the flow cross-section. The cross-sectional widenings 3 form a conical cylinder section with a gradually increasing flow cross-section whose diameter D increases from the diameter d of the cross-sectional constriction 2 to an inner diameter DN of a cylinder section directly adjacent to the cross-sectional widening 3. The inner diameter DN corresponds approximately to the diameter of the strand, not shown. The cross-sectional constriction 2 thus forms, with the cross-sectional widenings 3, a Venturi nozzle, the one cross-sectional enlargement 3 acting as confuser and the other cross-sectional widening 3 acting as a diffuser as a function of the main flow direction H. Even if the Venturi nozzle thus formed in one piece with the connection fitting is shown formed, the Venturi nozzle can be provided for example in the form of an insert, not shown, which is insertable into the connection fitting.

In the main flow direction H, the cross-sectional enlargement 3 acting as a diffuser is provided immediately adjacent to a threading opening 4. To the threading 4 leads a threading channel is formed obliquely to the main flow direction H. The threading channel encloses with the main flow direction H an angle α of about 45 °.

The connection fitting further has a discharge opening 4 upstream of the cross-sectional widening 3 acting as a confuser with a discharge channel, the discharge opening 4 and the discharge channel being symmetrical to the center axis A with respect to the threading opening 4 and the threading channel 7. Accordingly, a partial flow of the strand flow is discharged at an angle β of about 135 ° relative to the main flow direction H in the Ausfädelkanal.

With the particular in Fig. 1 shown symmetrical configuration of the first embodiment of a connection fitting, a similar flushing effect of the ring line for each directed in the main flow directions H flow is achieved.

The Fig. 2 to 4 show a second embodiment of a connection fitting, wherein like reference numerals identify like components with respect to the first embodiment. The second embodiment differs from the first embodiment essentially in that in the cross-sectional constriction 2, a closure body 5 is provided, at whose respective ends lying in the main flow direction, a return spring 6 is arranged. In particular, the shows Fig. 2 the closure body 5 in a closed position, ie, in a non-deflected position for a ruling in the strand volume flow Q, which is smaller than a critical volume flow Q _crit . The critical volume flow Q _crit corresponds in particular to a volume flow value at which the closure body 5 just barely seals the cross-sectional constriction 2. As far as a volume flow Q exceeds the critical volume flow Q _crit , the closure body shifts in such a way that a as in the FIGS. 3 and 4 shown flow passage between the closure body 5 and an inner wall of the cross-sectional constriction 2 and the cross-sectional constriction 3 is possible.

The closure body 5 is rotationally elliptical. The main axis of the rotary ellipse lies on an axis of symmetry extending in the main flow direction H of the cross-sectional constriction 2, along which the closure body 5 is displaceable. The closure body 5 is further arranged such that in its closed position, for example in flowlessness (Q = 0), the minor axis of the rotary ellipse lies on the center axis A of the cross-sectional constriction 2. The closure body 5 has an inner diameter d of the cross-sectional constriction 2 almost equal maximum diameter, so that the closure body 5 sealingly closes the cross-sectional constriction 2 in its closed position. A diameter of the closure body 5 extending in the main flow direction H is essentially freely selectable, but in particular such that the closure body 5 extends in the main flow direction H over an area of the cross-sectional constriction 2 into the regions of the cross-sectional widening 3. Return springs 6 act on the respective ends of the closure body 5 lying in the main flow direction H. The points of attack of the return springs 6 are in the horizontal axis of rotation of the closure body 5. The other ends of the return spring 6 are firmly connected to the connection fitting. The fixation of the return springs 6 on the connection fitting is preferably carried out in one of the inlet and Ausführelöffnung 4 upstream or downstream region, so as not to hinder in the Ausfädelöffnung 4 or coming from the Einfädelöffnung 4 flow.

With the 3 and 4 a deflection of the closure body 5 of the connection fitting according to the invention according to the second embodiment in both main flow directions H is shown. The deflection shown can be achieved with a volume flow Q greater than Q _crit , so that a volume flow introduced into the connection _fitting can be discharged on the one hand into the ring conduit and on the other hand past the closure body 5. The return springs 6 acting on the closure body 5 experience such a deflection that, when the volume flow Q decreases, the closure body 5 is correspondingly returned in the direction of its starting position. As return springs 6 preferably tensile and / or compression springs are used. It is not absolutely necessary to provide a return spring 6 at each end of the closure body 5, but any number of return springs 6 can be provided in any arrangement in the connection fitting, as long as the closure body 5 substantially along the main flow direction H from an initial position the closure position in a deflection position and back is movable. The shape of the closure body 5 is also not limited to an ellipsoidal shape, but the closure body 5 may also have a parabolic or circular or a different type than closure body 5 suitable cross-section. Also the diameter of the closure body 5 is adaptable to the particular circumstances, so that the closure body 5 a as in the FIGS. 2 to 4 shown diameter or a correspondingly smaller diameter.

The first embodiment of a connection fitting is particularly suitable for occurring in the connection fitting constant (stationary) volume flows, while in the Fig. 2 to 4 shown second embodiment of a connection fitting in drinking or service water systems with variable (dynamic) volume flows can be used, since an adjustment of the pressure difference can be done dynamically via the provided in the cross-sectional constriction 2 closure body 5 in dependence of the respective volume flow Q.

The Fig. 5 to 8 show a third and fourth embodiment of a connection fitting substantially corresponding to the first and second embodiments, wherein the third and fourth embodiments differ from the previous one by an inline tube 9 received by the connection fitting. Like reference characters indicate like components with respect to the first and second embodiments.

The liner tube 9 is coaxial in the main flow direction H and preferably concentric. As in the Fig. 6 to 8 shown, the liner tube 9 is preferably surrounded by the closure body 5 such that the liner tube 9 is simultaneously a suitable for the closure body 5 in the main flow direction H guide, whereby a tilting of the closure body 5 in a displacement desselbigen can be additionally counteracted. Furthermore, at least in the main flow direction H free ends of the closure body 5 at least three return springs 6 or for example a inliner tube 9 receiving return ring spring (not shown) attack so that a parallel to the liner tube 9 movement of the closure body 5 can be reliably ensured , In other words, the springs 6 ideally engage uniformly around the inliner tube 9 at the free end of the closure body 5, a radial distance of at least 120 ° between adjacent points of engagement of the springs 6 on the closure body 5 for a parallel, tilt-free movement of the closure body 5 sufficient.

That in the Fig. 5 to 8 shown third and fourth embodiment of a connection fitting shows the same effects and functions shown in connection with the first and second embodiments. In particular, with these embodiments a ring line for both cold and hot water are designed to be efficient, since the inliner tube 9 is used as a return line for the loop, whereby a reliable flushing all connected to the ring and leading to a consumer loops can be achieved.

reference numeral

1

Inlet and outlet openings

2

Cross-sectional narrowing

3

Cross-sectional widening

4

Entrance and Ausfädelöffnung

5

closure body

6

return spring

9

liner tube

d

Diameter of the cross-sectional constriction

D

Diameter of the cross-sectional widening

DN

Diameter of the strand and cylinder section

H

Main flow direction

Q

flow

Q _crit

Critical volume flow

α

Angle between threading channel and main flow direction

β

Angle between Ausfädelkanal and main flow direction

Claims (15)

1. Connection fitting for connecting a ring main having at least one consumer to a storey line or an ascending pipe line or ring, each with an inlet and outlet opening (1) which can be connected to the line or ring, and each with an inter-lying merge-in and branch-off opening (4) which are provided to connect the ring main and are separated from one another by a cross-sectional constriction (2), the cross-sectional constriction (2) being bordered by two cross-sectional widenings (3) which become gradually larger in the direction of the inlet and outlet openings (1); the merge-in opening (4) being arranged in the region of the one cross-sectional widening (3) and/or immediately adjoining said cross-sectional widening (3) on the side opposite the cross-sectional constriction (2); characterised in that the branch-off opening (4) is arranged in the region of the other cross-sectional widening (3) or is arranged immediately adjoining said cross-sectional widening (3) on the side opposite the cross-sectional constriction (2).
2. Connection fitting according to claim 1, characterised in that the merge-in opening (4) is configured such that the ring main flow, returned from the ring main, flows in at an inflow angle (α) of not more than 75° to a main flow direction (H) running from the inlet opening (1) to the outlet opening (1).
3. Connection fitting according to claim 2, characterised in that the inflow angle (α) is between 35 degrees and 55 degrees to the main flow direction (H).
4. Connection fitting according to either claim 2 or claim 3, characterised in that the inflow angle (α) is between 42 degrees and 47 degrees to the main flow direction (H).
5. Connection fitting according to any one of the preceding claims, characterised in that the connection fitting is configured symmetrically to at least one centre axis (A) of the cross-sectional constriction (2) at least in respect of the configuration of the cross-sectional widenings (3) and of the merge-in and branch-off openings (4).
6. Connection fitting according to any one of the preceding claims, characterised in that the connection fitting is configured as a component cast in one piece.
7. Connection fitting according to any one of the preceding claims, characterised in that the connection fitting comprises a sealing element (5) which is arranged in the cross-sectional constriction (2) and can be moved in a main flow direction (H) running from the inlet opening (1) to the outlet opening (1).
8. Connection fitting according to claim 7, characterised in that the sealing element (5) has a maximum diameter which is almost the same as an internal diameter (d) of the cross-sectional constriction (2) in order to substantially tightly seal the cross-sectional constriction (2) when there are small volume flows (Q) right up to a critical volume flow (Q_crit).
9. Connection fitting according to either claim 7 or claim 8, characterised in that the sealing element (5) is configured in the shape of an ellipse.
10. Connection fitting according to any one of claims 6 to 8, characterised in that the sealing element (5) cooperates with at least one return spring (6) which acts in the main flow direction (H).
11. Connection fitting according to claim 10, characterised in that a force engagement point of the return spring (6) on the sealing element (5) is located in an axis of symmetry, running parallel to the main flow direction (H), of the sealing element (5), and in that the force emanating from the return spring (6) acts along the axis of symmetry.
12. Connection fitting according to either claim 10 or claim 11, characterised in that engaging on the ends of the sealing element (5) which are each located in the main flow direction (H) is at least one return spring (6) which cooperates with the sealing element (5) in the main flow direction (H), and the resulting force of which, acting in the main flow direction (H) is equal to zero when there is no flow.
13. Connection fitting according to any one of the preceding claims, characterised in that the connection fitting accommodates a pipe (9) arranged parallel in the main flow direction (H).
14. Connection fitting according to claim 13, characterised in that the pipe (9) is arranged coaxially in the main flow direction (H).
15. Drinking water and industrial water system having at least one storey line or ascending pipe line or ring, characterised by a plurality of ring mains which are arranged in tandem in the line or ring in the direction of flow and which lead to at least one consumer and are each connected to the line by a connection fitting according to at least one of the preceding claims.

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