EP2843141A1 - Propulsion jet nozzle - Google Patents

Abstract

Propulsion jet nozzle for installation in service or drinking water piping systems wherein at least one ring line is arranged on a main line and wherein the propulsion jet nozzle is arranged between the branch fittings of the ring line. The propulsion jet nozzle has a nozzle wall (4), an inlet opening (2) and an outlet opening (3), wherein the cross-sectional area of the inlet opening is constant and the cross-sectional area of the outlet opening is variable. For this purpose, the nozzle wall is designed to be flexible, so that increases at a high inlet pressure, the size of the outlet opening.

Description

The invention relates to a propulsion jet nozzle for installation in drinking or service water systems as well as in ultrapure water systems preferably in the main line, wherein at least one ring line is arranged on the main line and wherein the propulsion jet nozzle is arranged between the branch fittings of the ring line, wherein the ring line an inlet opening and an outlet opening having.

In the field of service and drinking water, a frequent water exchange is sought for hygienic reasons in the piping systems, especially in ring pipes, which are rarely used or flowed through. This can be done with a pump or a nozzle that is cross-sectional narrowing. Known jet propulsion or Venturi nozzles, which are installed between the flow and return of the loop in the main strand through such a nozzle in the ring lines forced a flow, which also in ring lines are hardly flowed through a water exchange takes place and thus a good water quality can be preserved.
Through a built-in nozzle in the main line between the branch fittings of the loop, a flow in the loop is stimulated when removing water at the consumer. The water flows through the nozzle at which a change in velocity occurs due to the constriction in the constriction and consequently a pressure difference Δp which causes a flow in the loop, whereby fresh water is sucked into the loop.

From the EP 2 592 191 A1 is a tubular connecting element is known, which is used to prevent stagnation in piping systems, especially in loops. The nozzle-like design triggers the Venturi effect and creates a flow. Such static flow dividers which do not change the nozzle cross-section have the disadvantage that they trigger practically no Venturi effect at low bleed amounts at the consumer and thus a low volume flow generated in order to generate a flow in the loop because the pressure difference .DELTA.p is too small. For large bleed amounts a correspondingly high flow is achieved, but also the pressure difference Δp undesirably high. For these reasons, a dynamic nozzle that adapts to the dispensing amount is preferable. This increases their flow cross-section at high flow, so that the pressure difference Δp is not undesirably high and at low flow, the flow cross-section is such that the flow is still accelerated enough to produce a sufficiently high pressure difference Δp to achieve a Venturi effect.

The object of the present invention is to achieve a sufficiently high pressure difference .DELTA.p for small tap volumes or low volume flow, which ensures a flow in the loop. In the case of large tap volumes, an undesirably high pressure difference Δp should not be complied with since piping systems should aim for the lowest possible pressure difference Δp.

The object is achieved according to the invention in that the cross-sectional area of the inlet opening is constant and the cross-sectional area of the outlet opening can be changed.
The propulsion jet nozzle is preferably installed in the main line depart from the ring lines. The Treibstrahldüse is installed between the branch fittings of the ring line, preferably in the region of the branch fitting of the outlet of the loop, so that the reduction of the cross section of the nozzle along the direction of joining takes place, whereby at the water removal at the consumer behind the nozzle in the flow direction, a pressure difference Δp is triggered which stimulates a flow in the loop. Preferably, the propulsion jet nozzle is placed and fixed by simply inserting it into a fitting of the main conduit, the inlet opening of the nozzle being only slightly smaller than the cross section of the main conduit.
At low dispensing amount at the consumer, the volume flow or the flow in the conduit is small, whereby the cross-sectional area of the Treibstrahldüse at the outlet opening also remains small in order to achieve a sufficiently high pressure difference .DELTA.p, thereby stimulating a flow in the loop and the water in the loop is exchanged to ensure a good water quality, even in pipe sections that are otherwise hardly flowed through.

If the tapping quantity at the consumer is high, the flow or the volume flow is also high, as a result of which the cross-section of the propulsion jet nozzle widens in order to keep the pressure difference Δp as low as possible. The pressure difference Δp must still be so high that a suction effect is triggered, whereby the water in the loop is pulled along.

A preferred embodiment of the present invention consists in that the cross-section of the outlet opening changes in accordance with the volume flow, in particular that the cross-sectional area of the outlet opening is small at low flow rate and high at high flow rate.
In order for such a change in the cross section of the outlet opening of the propulsion jet nozzle can be ensured, the nozzle wall must be flexible.
Preferably, the nozzle has a constant cross-sectional area at the inlet opening, which does not change when the volume flow changes. Depending on the volume flow, however, the cross-sectional area of the outlet opening of the nozzle changes. The cross-sectional area of the propulsion jet nozzle is reduced along the length of the nozzle according to the volume flow.

The inlet opening preferably has a round or polygonal shape. It is slightly smaller than the cross-sectional area of the main line into which the nozzle is installed in order to produce as little resistance as possible.

It is advantageous if the nozzle only in a fitting eg. A T-piece must be inserted and by screwing the fitting with an appealing connector, the propulsion jet nozzle is fixed in the main line. Alternatively, it is also conceivable that the nozzle is fixed by a thread or a quick release in the main line.
The propulsion jet nozzle is preferably formed in one piece, which ensures economical production.
A preferred embodiment is that the nozzle wall is flexible. This can be achieved in that the wall is slotted, whereby individual tabs are formed. The number of slots and thus the resulting tabs is arbitrary, preferably, the nozzle has four to ten slots and tabs.

At high flow rates, the tabs diverge, as conceivable as in the case of an opening of a flower, as a result of which the cross-sectional area of the outlet opening increases. When the volume flow is reduced, the tabs close correspondingly or the cross-sectional area of the outlet opening decreases.

An alternative embodiment is that the nozzle wall is formed bellows, whereby the cross-sectional area of the outlet opening can change according to the volume flow. Another embodiment of the propulsion jet nozzle is to make the nozzle wall elastic. Preferably, an elastic material is used, which expands and contracts according to the volume flow.

Fig. 1

einen Längsschnitt durch eine Hauptleitung mit einer daran angeordneten Ringleitung und einer in der Hauptleitung montierten Treibstrahldüse,

Fig. 2

eine Treibstrahldüse mit geschlitzter Wandung und Rippen,

Fig. 3

eine Treibstrahldüse mit geschlitzter Wandung und Federarmen und

Fig. 4

ein Funktionsdiagramm des Druckunterschieds Δp in Abhängigkeit des Volumenstroms in der Hauptleitung.

Embodiments of the invention will be described with reference to the figures, wherein the invention is not limited to the embodiments. Show it:

Fig. 1

a longitudinal section through a main line with a loop disposed thereon and a mounted in the main propulsion jet nozzle,

Fig. 2

a jet nozzle with slotted wall and ribs,

Fig. 3

a Treibstrahldüse with slotted wall and spring arms and

Fig. 4

a functional diagram of the pressure difference Δp as a function of the volume flow in the main line.

Fig. 1 shows an installed Treibstrahldüse 1 in a main line 11 of a service, drinking or ultra pure water pipe system. On the main line 11 at least one ring line 12 is arranged, which is connected by branch fittings 5, 6 with the main line 11. Preferably T-pieces 9 are used, with other branch fittings can be used. So that such ring lines 12 are also repeatedly flowed through with fresh water, even if no consumer is arranged on it or this is rarely actuated, the flow in the ring line 12 is excited by means of a propulsion jet nozzle 1. The propulsion jet nozzle 1 is arranged between the two branching fittings 5, 6. It is oriented such that the cross-sectional area of the propulsion jet nozzle 1 in the direction of flow of the volume flow V can reduce. The inlet opening 2 of the propulsion jet nozzle 1 has a constant unchangeable cross-section. Over the length of the nozzle 1, the cross-sectional area is reduced, wherein it does not have to be over the entire length of the nozzle 1, it is also sufficient over an area up to the outlet opening 3 of the nozzle 1. At maximum volume flow V, the cross-sectional area of the outlet opening 3 expands such that it corresponds to the cross-sectional area of the inlet opening 2. The propulsion jet nozzle 1 is arranged in the region of the branch fitting 6 of the outlet ring line 12, so that the desired Venturi effect occurs. If, for example, water is withdrawn at the end of the main line 11 at a tapping point or by a consumer, the water flows through the nozzle 1. The cross-sectional constriction by means of the nozzle 1 causes a change in speed and consequently a pressure difference .DELTA.p which occurs in the ring line 12 triggers a flow and so sucks fresh water into the loop 12 (venturi effect). Due to the flexibility of the nozzle 1 according to the invention, the cross section of the outlet opening 3 of the nozzle 1 adapts in accordance with the volume flow V in the main line 11. This means that at high or maximum volumetric flow V, the outlet opening 3 widens to the maximum cross-section 8, which corresponds approximately to the maximum cross-sectional area of the inlet opening 2 of the nozzle 1. If there is a small or minimal volume flow V, the outlet opening 3 has a minimal cross-sectional opening 7 , As a result of this variability of the outlet opening 3 of the nozzle 1, it is achieved that on the one hand a sufficiently high pressure difference .DELTA.p is achieved by the cross-sectional area reduction of the drain opening 3 at low or minimum volume flow V in order to excite a flow v in the ring line 12. At high or maximum volumetric flow V, a cross-sectional area enlargement of the outlet opening 3 is achieved so that the pressure difference Δp does not turn out too great, which is undesirable in such piping systems.

Preferably, the propulsion jet nozzle 1 can only be inserted into the T-piece 9 and then screwed by means of connection piece 10, so that the nozzle 1, in the region of its inlet opening, is clamped therebetween. Alternatively, the nozzle 1 may have a thread by means of which it can be screwed into the connector. Also, other mounting options are quite conceivable.

Fig. 2 shows a propulsion jet nozzle 1, which has slots 13 in the nozzle wall 4. The inlet opening 2 is round. The cross-sectional area in the region of the inlet opening 2 remains constant even during the change in the volume flow V. The drive jet nozzle 1 is flexible or the cross-sectional area of the outlet opening 3 can be changed by means of the slots 13 which run in the nozzle wall 4. Tabs 14 are formed through the slots 13, which open or close corresponding to the volume flow V. For reinforcement, there is the possibility that the tabs 14 have ribs 15, which need not extend over the entire length. Preferably, a nozzle 1 four to ten tabs 14 wherein also a different number is possible.

Fig. 3 shows a further possible embodiment of a propulsion jet nozzle 1 according to the invention. In order to achieve the optimum resistance of the nozzle 1 or the flaps 14 in accordance with the volume flow V, it is possible to arrange spring arms 16 on the flaps 14. As a result, the force of the tabs 14, which acts correspondingly against the force of the volume flow V increases.

In Fig. 4 a function diagram is shown, which shows the pressure difference .DELTA.p as a function of the volume flow V in the main line 11. Curve A shows the course of a static jet nozzle, which is known from the prior art and does not change its geometry. The diagram shows that A achieves no pressure difference Δp or only a minimal pressure difference Δp at a low volume flow, as a result of which a sufficiently high suction effect is not achieved in the ring line 12 and thus no exchange of the water in the loop can take place. By contrast, at maximum flow V of the nozzle A, the pressure difference Δp is undesirably high. Curve B shows the course of the nozzle according to the invention 1. By reducing the cross-sectional area of the outlet opening 3, a pressure difference .DELTA.p which is sufficiently large to achieve a flow v in the ring line 12 is achieved even with a minimum volume flow V. In return, at maximum volumetric flow V, the pressure difference Δp is not as high as in the case of a static nozzle 1, since the outlet opening 3 has expanded in accordance with the volumetric flow V.

LIST OF REFERENCE NUMBERS

1

propulsion

2

inlet port

3

outlet

4

nozzle wall

5

Branch fitting, inlet loop

6

Branch fitting, outlet ring pipe

7

Minimal cross section, at min. V

8th

Maximum cross section, at max. V

9

Tee

10

connector

11

main

12

loop

13

slot

14

flap

15

rib

16

spring arm

V

Volume flow Main line

v

Volume flow loop

A

static propulsion jet nozzle with fixed geometry

B

propulsion jet nozzle according to the invention

Claims (8)

Propulsion jet nozzle (1) for installation in service or drinking water piping systems of a building as well as in ultrapure water systems, preferably in the main line (11), wherein at least one ring line (12) on the main line (11) is arranged and wherein the propulsion jet nozzle (1) between the branch fittings (5, 6) of the ring line (12) is arranged, wherein the propulsion jet nozzle (1) has an inlet opening (2) and an outlet opening (3), characterized in that the cross-sectional area of the inlet opening (2) is constant and the cross-sectional area the outlet opening (3) is variable. Propulsion jet nozzle (1) according to claim 1, characterized in that the cross section of the outlet opening (3) changes in accordance with the volume flow (V) in the main line (11), in particular that the cross-sectional area at low flow (V) is small and at high flow rate (V) is large. Propulsion jet nozzle (1) according to one of claims 1 or 2, characterized in that the nozzle wall (4) is flexible. Propulsion jet nozzle (1) according to one of claims 1 or 2, characterized in that the inlet opening (2) is round or polygonal. Propulsion jet nozzle (1) according to one of the preceding claims, characterized in that the propulsion jet nozzle (1) is formed in one piece. Propulsion jet nozzle (1) according to one of the preceding claims, characterized in that the nozzle wall (4) is slotted whereby individual tabs (14) are formed. Propulsion jet nozzle (1) according to one of the preceding claims, characterized in that the nozzle wall (4) is bellows-shaped. Propulsion jet nozzle (1) according to one of the preceding claims, characterized in that the nozzle wall (4) is designed to be elastic.

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