HK1154060B - Connecting fitting - Google Patents

Description

The present invention relates to a connecting fixture for connecting a ring line with at least one consumer to a floor or upstream pipe string with inlet and outlet openings to be connected to the string and a single threaded opening in between for the ring line, which is supplied in the direction of flow with a cross-sectional narrowing.

In the field of drinking water technology, in particular to prevent germination in drinking water pipes, it is known to be possible to provide for a connection device of the type mentioned above, which is sub-stacked in the direction of flow of the strand to a branch device. At the branch device, a partial flow of the strand is extracted and passed through a ring line to one or more consumers. The ring line enters the single thread opening of the connection device. In the direction of flow of the single thread opening, a cross-sectional narrowing is provided which, after a nozzle opening and the branch and the insertion, produces a pressure difference which, when connected in a straight line, generates a greater current than the current in the main thread. For example, a ring or a ring is to be constructed independently of each other, whether or not these two strands are connected in the same block or in the same ring.

For example, the type of connector described above, known as part of a pure water supply system, is a type of connector where the ring current is directed from the ring line to the strand at an angle of about 90 degrees to the main current direction and is introduced into the connector. The main current direction is the direction in which the main current, i.e. the flow within the strand, passes. The type of connector described above, known as DE 39 19074 has a cross-sectional narrowing which opens a type of vent and, in the area of the single-wire opening, a pressure which is so low as to cause a loss of current in the direction of the main current, for example, at the point of entry of the wire.

The connecting valve is a type of venturi nozzle which forms part of a hot water circulation system and connects the hot water circulation line to a public drinking water supply network. The connecting valve ensures that hot water is immediately available when hot water is withdrawn from a tap at a point connected to the system. The connecting valve acts as a venturi nozzle, which allows a cross section narrowing of the circulation line in the direction of flow through a single threaded opening in the direction of the flow and a cross section narrowing of the circulation line in the direction of the flow.

Practical experiments carried out by the applicant have shown that, in particular for several ring lines in the main current direction, the flow dynamics design requires special attention, not only to minimise the pressure loss within a ring line but also to coordinate the pressure loss of each main current direction successive connecting fitting so as to ensure the desired flow through the ring lines in a safe manner, so that, if a consumer is not present, all the ring lines in the main current direction are flushed. In particular, care should be taken to ensure that the pressure difference between each single connecting fitting is kept low, so that the flow through the ring line is not affected by the presence of water, for example if the water is discharged in the main current direction of the ring line.

The present invention is intended to specify a connection of the type described at the outset which leads to improved flow rates in the area of the ring line associated with the connection and to specify a water supply system with at least one floor or aerial pipe, to which several ring lines are connected by means of threaded and single threaded openings and a cross-sectional narrowing provided in the string between the threaded and single threaded openings of the ring line associated with the connection, which better meets the practical requirements.

To solve the first aspect of the above problem, the present invention specifies a connecting assembly having the characteristic of claim 1.

The present invention is based on the assumption that the flow in the ring line can be controlled, the flow being caused by the pressure difference caused by the nozzle-like cross-sectional narrowing in the strand between the thread opening and the single thread opening by a variable cross-sectional narrowing area, in particular depending on the volume flow in the strand, i.e. the effective pressure within the strand. The design according to the invention allows, depending on the position of a throttle element which varies in cross-sectional narrowing, any characteristic of the strand, in particular any cross-sectional narrowing, i.e. the distribution of the current on the strand is determined by the flow rate between the strand and the motor, which is on the other hand controlled by a throttle element which is designed to move in the direction of the throttle.

According to the present invention, the throttle element is held in motion in a predetermined manner so that at a pressure difference between the inlet and outlet apertures of 30 mbar or less the pressure difference of the ratio Δp ∼ Qn follows, whereby 0,6 < n < 1 and Q is the flow rate in m3/h in the strand. Preferably, the connecting fixture behaves in a corresponding manner at a pressure difference between the inlet and outlet aperture of 20 mbar or less. In particular, n has a numerical value of 2/3, and also for the range of a pressure difference of 30 to 20 mbar. Furthermore, the pressure difference of the ratio Δp ∼ Q2 follows preferably at a pressure difference between the inlet and outlet aperture of 20 mbar or less, preferably 10 mbar or less, and preferably 30 mbar or more.

In accordance with a preferred further formation, this throttling element is kept in its initial position, which hereby indicates the position at which the maximum possible cross-sectional narrowing in the strand is achieved, in the cross-sectional narrowing area, by forming a leakage flow gap. This preferred design ensures that even at relatively low volume flows in the strand, a partial current flows through the strand, so that at no time can the total flow in the strand be through the ring lines alone and bypassing the length section located between the branch and single openings of the respective ring lines, which would lead to narrowing of these flow sections. The small strands in front of the strand can then be inserted, for example, if a valve is used, for example, to prevent the flow of the strand.

According to an alternative design, this effect can also be achieved by providing a bypass in the area of the cross-sectional narrowing to allow the leakage flow. In this design, the throttle element can be located close to the cross-sectional narrowing without impeding the leakage flow. Accordingly, further development of the present invention requires only leakage devices that allow the corresponding leakage flow through the strand, i.e. a leakage flow excluding the conduit. The use of a throttle as a means of narrowing the cross-sectional area should be such that the leakage should be dimensioned so that the first removal of the throttle element from the end of the thread to a specified current should be achieved both within the ring and through the ring, and thus a small current should be generated both through the ring and through the ring.

According to a preferred further development of the present invention, the cross-sectional narrowing, i.e. the passage formed, usually fixed to the housing of the connecting device, is formed by a cone, the front surface of which forms a nozzle in the direction of flow, i.e. the narrowest cross-section in the strand, and the other cone surface is preferably formed as a diffuser and forms a support surface for a cone counter-surface formed by the throttle element. To form a specific flow characteristic, the cone counter-surface of the throttle element and the cone surface of the double-unit need not have the same contour and/or slope. Rather, both cones must have different contours and/or slopes.

To control the respective flow rates through the ring line on the one hand and through the strand on the other hand, the throttle element is preferably held in a spring-mounted position in front of the cross-sectional joint in such a way that the throttle element is in the original position against the cross-sectional joint.

According to another preferred design of the present invention, the device also has a guide element that keeps the throttle moving. The guide element preferably rests on the inner circumference of the housing of the connecting assembly so that the throttle element is held and guided within the housing as defined. In order to ensure symmetrical flow of the strand, including in the cross-sectional area, a further preferred design of the present invention suggests that the guide element and the throttle element are coaxially aligned with each other and that their lengths are parallel to the longitudinal axis of the strand.

According to another preferred design of the present invention, an input component is provided which, in addition to the guide element, also forms a narrowing section in the direction of flow, which forms the cross-sectional narrowing. Accordingly, the throttling element for varying the cross-sectional narrowing cross-sectional area can be installed and realized in the strand as a uniform input component. The input component can be inserted in a pipe line of the strand.

In particular, in the case of the initial equipment of a connecting fitting, it is preferable to provide for restraints on the outer circumference of the service part, which are preferably spaced in the direction of the circumference. These restraints are used to keep the service part inside the fitting case. The restraints are preferably formed by resting noses which intervene in the resting nuts formed on the inner circumference of the fitting case.

According to another preferred design of the present invention, the conductor extends into the single thread opening region, i.e. partially covers the single thread opening in the connecting assembly area and forms a ring current passage through the conductor section so that the ring current can be returned through the conductor to the main current in the strand.

The training described in claim 10 provides the possibility of running an inline valve within the connection, which is normally intended as a circulator in a pipe-in-pipe connection and usually leads hot water to the consumer.

The inner tube is preferably used to carry the throttle element in a sliding manner according to another preferred design, which may allow, for example, a leakage current to pass through the cross-sectional narrowing passage if the throttle element is in its original position between the outer surface of the inner tube and the throttle element stored in the sliding position.

To achieve the ring current flow throughput, it is proposed, according to a further preferred design of the present invention, to provide the guide element at at least one of its front ends with several supporting supports, which define the outer circumference and extend in an axial direction. In the circumference, adjacent supporting supports form a cleft through which the introduced ring current can pass the guide element in a radial direction relative to the longitudinal axis of the strand. At the front end, the corresponding supports are preferably funnel-shaped, thus facilitating the insertion of the inner tube during the installation of the connection.

To solve this problem, it is proposed to construct a water supply system with the characteristics of claim 15 and a connection device according to the invention.

Further advantages and details of the present invention are shown in the following description of an example of an embodiment in conjunction with the drawing.

In this show: Fig. 1a perspective view of an input part of the embodiment with the flow inlet in the throttle element's starting position;Fig. 2a perspective side view as shown in Fig. 1 in the fully open position of the input part;Fig. 3a perspective side view of the flow inlet and output part shown in Fig. 1;Fig. 4a longitudinal view through a section of a strand in the area of the connecting assembly at a throttle element in the starting position;Fig. 5the view shown in Fig. 4 with the throttle element fully open;Fig. 6 in Fig. 5C is shown in detail in an enlarged illustration and Fig. 7e graph with a comparison of the characteristics of the strand in the section depending on the pressure difference between the opening and the opening of the strand.

Figures 1 to 3 show an input part 2, which may be made of metal or plastic and which has a cylindrical outer circumference essentially similar to the cylindrical inner circumference of a valve body shown in Figures 4 and 5 and marked with reference 4. The arrow S shown in Figures 1 to 3 shows the direction of flow of a main current flowing through the strand, marked with reference in Figures 4 and 5. The flow through the ring line is marked with reference R.

At its forward end, in the direction of flow, the 2nd part has several 6th-level platforms distributed on the perimeter, which continue the cylindrical outer circumference and are oriented inward at their free end in the form of a funnel.

This area of the input part 2 forms a guide element 10 for a throttle element 12 . Between the front bars 6 and the rear bars 8 , the input part 2 has a ring section 14 whose inner circumference forms a cone surface 16 which interacts with a cone counter surface 18 of the throttle element 12 . In the cross section, a nozzle cross section formed by the ring section 14 which forms a cross-sectional narrowing with respect to the main flow H is radially overlaid inward by the V bars 6 . In other words, the nozzle has a larger cross section at its narrowest than the inside of the stones 6 which form a cross section for the 12th throttle element .

In the area of the flow-direction rear end of the ring section 14, several resting nozzles 20 are formed at the outer circumference, which are interlaced in resting knots 22 separated at the inner circumference of the body 4. Downstream of the resting nozzles 20 and held by each second of the rear step 8 is a ring 24 which includes and extends the throttle element 12 and a support surface for 26 springs 28 which extends between this ring 24 and a ring area 30 of the throttle element 12 which connects in flow-direction directly behind the cone surface of the throttle element 18 12.

The free ends of the conical racks 6, 8 and 8 which run inwards form a funnel-shaped opening in the example shown, which facilitates the penetration of an inner tube 32 of an inliner as shown in Figures 4 and 5.

The inner tube 32 is pierced by a central bore of the throttling element 12 which is passed through the inner circumference of the ring 24 and the adjacent s-flow steps.

As can be seen from Figures 4 to 6, the input part 2 with its guide element 10 is located in the area of a single thread opening 34 of an unspecified ring line, which starts upstream of the input part 2 with a thread opening from the strand, leads to one or more consumers, for example a hot tub in a hotel, and is returned to the strand in the area of the connecting fitting.

In the initial position shown in Fig. 4, where the cone counterpart 18 of throttle element 12 is attached to cone surface 16 of cylindrical section 14, a leakage flow gap remains between the adjacent cone surfaces 16, 18 so that a pressure difference above the maximum cross-sectional narrowing allows some leakage flow to occur also between adjacent cone surfaces 16, 18.

As the pressure difference above the cross-sectional joint V increases, the throttle element 12 is pushed backward in the flow direction against the force of the spring element 28 and the cross-sectional joint V is increased until the throttle element 12 strikes the front end of the conduit formed by the guide element 10.

The resulting flow characteristic in the strand is illustrated in Fig. 7 in comparison with a conventional flow characteristic K of a constant throttle. A very small pressure difference in the strand of about 10 to 20 mbar gives a leakage flow characterized by L. Changes in pressure in this range give a flow characteristic corresponding to a conventional throttle, but with a constant flow cross section formed by the leakage flow gap.

At higher pressure differences the relative movement between throttle element 12 and the input part 2 begins, which is possible up to a pressure difference of about 30 mbar. The result is an overall flow of the ring line in the string compared to a nozzle with constant cross-sectional narrowing. Only at a pressure difference above 30 mbar is the throttle element 12 in its final position, i.e. it hits the end surface of the guide, so that a further increase in the pressure difference between the outlet and the single thread opening in the string leads to a normal flow. The flow is in a pressure differential area where the throttle element 12 gradually flows away from the cone, 14The correlation between the pressure difference and the flow in the strand is linear: Δp ∼ Q2/3 with Δp = pressure difference between the thread opening and the single thread opening and Q = flow rate in m3/h in the strand. This characteristic is shown in Fig. 7 with D. Below this range, i.e. in the leakage flow range and at a pressure difference of less than 13 mbar, a dependence Δp ∼ Q2 results.

The continuous flow K from the origin of the graph shown in Fig. 7 at zero corresponds to the conventional characteristic of a nozzle for producing a forced flow in the ring line, for example according to DE 39 19 074.

List of reference marks

2Purpose component4Fit case6Stage8Stage10Guidance element12Drossel element14Ring section16Cone surface18Cone counter surface20Rast noses22Rast knots24Ring26Support surface28Feder element30Ring surface32Inner pipe34One-coil opening36Wire opening38Ring current flow rate40Radial projections of the steps 8D Conventional flow characteristics with contrasting flow characteristicsHigh flow characteristicsLSS flow characteristics for leakageRing current flowRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current flow characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing current characteristicsRing characteristicsRing current characteristicsRing current characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsRing characteristicsR

Claims (15)

1. Connection fitting for the connection of a ring main with at least one consumer to a storey or rising main branch with inlet and outlet openings (2, 4) which can be connected to the branch, an intervening merge opening (34) for the ring main which is preceded in the flow direction by a cross-section constriction (V), for providing a a pressure difference (Δp) between the inlet and the outlet openings (2, 4) effecting a flow in the ring main upon a flow in the storey or rising main branch characterised by means (12, 28) for varying the passage area of the cross-section constriction (V), wherein the means comprises a movable throttle element (12) which can move relative to the cross-section constriction (V) such that a pressure difference (Δp) between the inlet and the outlet openings (2, 4) in the range between a lower value of between 10 and 20 mbar and an upper value of 30 mbar follows the relationship where 0.6 ≤ n ≤ 1 and Q is the flow rate in m³/h in the ring main.
2. Connection fitting according to Claim 1, characterised in that with a throttle element (12) contacting the cross-section constriction (V) a leakage flow (L) through the branch is possible.
3. Connection fitting according to Claim 2, characterised in that the throttle element (12) is held in an initial position in the region of the cross-section constriction (V) with the formation of a leakage flow gap.
4. Connection fitting according to any one of the proceeding Claims, characterised in that the cross-section constriction (V) is formed by a cone and that the throttle element (12) forms a conical counter surface (18), which interacts with a conical surface (16) of the cone.
5. Connection fitting according to any one of the proceeding Claims, characterised in that the throttle element (12) is held by a spring element (28) in the initial position.
6. Connection fitting according to any one of the proceeding Claims, characterised in that the means comprise a guide element (10) which movably holds the throttle element (12) wherein the guide element (10) and the throttle element (12) are formed coaxially with respect to one another and their longitudinal axes are in alignment with the longitudinal axis of the branch.
7. Connection fitting according to Claim 6, characterised in that the guide element (10) is formed as part of an insertion part (2) which forms the cross-section constriction (V).
8. Connection fitting according to Claim 7, characterised in that on the external circumference of the insertion part (2) locking means (20) are provided with which the insertion part (2) is held in a fitting housing (4) of the connection fitting, forming the inlet and outlet openings as well as the intervening merge opening (34).
9. Connection fitting according to any one of the proceeding Claims, characterised in that the guide element (10) extends in the region of the merge opening (34) and on its outer wall has at least one ring main flow outlet (38) passing through the guide element (10).
10. Connection fitting according to any one of the proceeding Claims, characterised in that the throttle element (12) has a through hole running in its longitudinal direction, through which an inner pipe (32) of a pipe-in-pipe circulation pipe can be passed.
11. Connection fitting according to Claim 10, characterised in that the inner pipe (32) movably guides the throttle element (12).
12. Connection fitting according to Claim 10 or 11, characterised in that the insertion part (2) has on at least one of its face-side ends several supporting ridges (6, 8) defining the external circumferential surface of the insertion part (2) and extending in the axial direction, the respective ends of the said supporting ridges being formed with a funnel shape.
13. Connection fitting according to any one of the proceeding Claims, characterised in that with the pressure difference (Δp) between the inlet and outlet openings of below the lower value and/or above the upper value, has the following relationship: where Q is the flow rate in m³/h in the ring main.
14. Connection fitting according to any one of the proceeding Claims, characterised in that with the pressure difference (Δp) between the inlet and outlet openings of 20 mbar or less, the pressure difference (Δp) following relationship: where 0.6 ≤ n ≤ 1, preferably n=2/3 and Q is the flow rate in m³/h in the ring main.
15. Water pipe system with at least one storey or rising main branch to which several ring mains are connected via separation and merge openings (34) and a cross-section constriction (V) provided between the separation and merge openings of the assigned ring main in the branch, characterized by a connection fitting according to any one of the aforementioned claims.