Inflow fitting

Abstract

An inflow fitting for the filling of a cistern comprises a housing, an outlet pipe, and a water passage formed in the housing and outlet pipe and having an entry and an exit, a float-controlled valve, which is disposed in the water passage and which shuts off the water passage or opens it up in the filling operation, and a float, which cooperates with the valve, for controlling the valve, wherein the float has a cavity that is fillable with water, and at least one buoyancy chamber. The inflow fitting further comprises a supplemental water tap, branched off from the water passage, for filling the said cavity in order to provide an additional weight. In the water passage, in the region of the supplemental water tap, is arranged at least one backflow element, with which a backflow can be provided in the region of the supplemental water tap for the pressure-independent removal of supplemental water.

Claims

1. An inflow fitting for the filling of a cistern, comprising a housing, an outlet pipe coupled to the housing, a water passage arranged through the housing and the outlet pipe, and the housing having an entry to the water passage, and the outlet pipe having an exit from the water passage, a float-controlled valve, which is arranged in the water passage and which shuts off or opens up the water passage in a filling operation, and a float, which cooperates with the valve, for controlling the valve, wherein the float has a cavity, which is fillable with water, and at least one buoyancy chamber, wherein the inflow fitting further comprises a supplemental water tap, branched off from the water passage, for filling the cavity in order to provide an additional weight on the float, wherein in the water passage, in a region of the supplemental water tap, at least one backflow element is arranged, with which a backflow can be provided in a region of the supplemental water tap for a pressure-independent removal of supplemental water, and wherein a cross section of the water passage, viewed in a direction of flow, extends conically after the backflow element, the conicity being such that the cross section of the water passage reduces with increasing distance from the backflow element.

2. The inflow fitting according to claim 1, wherein the backflow element is designed such that a cross section of the backflow element is enlarged in an event of rising pressure, such that a water quantity fed to the supplemental water tap is substantially constant.

3. The inflow fitting according to claim 2, wherein the water quantity fed to the supplemental water tap is constant over a pressure range from 0.1 to 10 bar.

4. The inflow fitting according to claim 1, wherein the backflow element is deformed in the event of rising pressure and, as a result of the deformation, a cross section of the water passage is enlarged in a region of the backflow element.

5. The inflow fitting according to claim 1, wherein the backflow element is of disc-shaped configuration, and wherein the supplemental water tap is arranged, with respect to a direction running orthogonally to a disc surface, directly in a region of the disc surface, or only at a short distance from the backflow element.

6. The inflow fitting according to claim 1, wherein the backflow element, in the direction of flow of the water in the water passage, is arranged after the supplemental water tap.

7. The inflow fitting according to claim 1, wherein the backflow element is made of a material chosen from the group consisting of: resiliently elastic material resiliently elastic plastic, rubber and silicone.

8. The inflow fitting according to claim 1, wherein the backflow element has a Shore hardness of greater than 50 Shore.

9. The inflow fitting according to claim 1, wherein the backflow element has a plurality of incisions, which divide sections of the backflow element into flaps, wherein said flaps are tiltable by the water pressure with respect to the water passage in the direction of flow.

10. The inflow fitting according to claim 9, wherein the incisions extend radially outwards from a central opening.

11. The inflow fitting according to claim 1, wherein the backflow element is mounted in the water passage on a bearing laterally surrounding the water passage.

12. The inflow fitting according to claim 1, wherein a step exists at an end of the conicity in the direction of flow and the cross section of the water passage in the outlet pipe enlarges after the step.

13. The inflow fitting according to claim 1, wherein the inflow fitting comprises the outlet pipe, which provides parts of the water passage and the exit and through which the water is deliverable into the cistern, wherein the backflow element, viewed in the direction of flow, lies before or in a region of an intake into the outlet pipe.

14. The inflow fitting according to claim 13, wherein the backflow element is clamped between the outlet pipe and the housing.

15. The inflow fitting according to claim 14, wherein the backflow element acts as a seal between the outlet pipe and the housing, such that no water can escape from the water passage through a joint between the housing and outlet pipe.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Preferred embodiments of the invention are described below with reference to the drawings, which serve merely for illustration and should not be interpreted restrictively. In the drawings:

(2) FIG. 1 shows a perspective view of an inflow fitting according to one embodiment of the present invention;

(3) FIG. 2 shows a sectional view of the inflow fitting according to FIG. 1, and

(4) FIG. 3 shows a further sectional view of the inflow fitting according to FIG. 1.

DESCRIPTION OF PREFERRED EMBODIMENTS

(5) In FIGS. 1 to 3, an inflow fitting 1 according to one embodiment of the present invention for the filling of a cistern is shown.

(6) The inflow fitting 1 comprises a housing 2, a water passage 3 arranged in the housing 2 and having an entry 4 and an exit 5, a float-controlled valve 6 arranged in the water passage 3, and a float 7 cooperating with the valve 6. The float-controlled valve 6, which is shown in FIGS. 2 and 3, shuts off the water passage 3 or opens this up in the filling of the cistern. The float 7 serves to control the valve 6. The float 7 has a cavity 8, which can be filled with water, and at least one buoyancy chamber 9. The buoyancy chamber 9 is designed open in the downward direction and is airtight in the upward direction, so that, in the filling operation, air is entrapped in the buoyancy chamber 9, so that the float 7 experiences an uplift. The buoyancy chamber 9 and the volume of the cavity 8 are here chosen such that, when the cavity 8 is fully filled, the float has an uplift which is tailored as closely as possible to the valve 6.

(7) The inflow fitting 1 further comprises a supplemental water tap 10 branched off from the water passage 3. With the supplemental water tap 10, the cavity 8 on the float 7 can be filled. That is to say, when the valve 6 is open, water is delivered not only via the port 5, but also via the supplemental water tap 10. The water tapped via the supplemental water tap 10 is conducted into the said cavity 8. For this, the supplemental water tap 10 has an outlet 22, which is directed towards the cavity 8. The supplemental water here flows along the dashed line W. In the shown figures, the supplemental water tap 10 is provided through a passage 23 from the water passage 3 in the direction of the outlet 22. The supplemental water component is about 2 to 5% of the total water component which flows through the water passage.

(8) In the shown embodiment, an optional control bore 26 is additionally present, which likewise feeds water to the cavity 8. However, only a very small water component flows through the control bore 26. This component is less than 1% of the total water component which flows through the water passage.

(9) When the valve 6 is open, the water flows out of the inflow fitting both via the exit 5 and via the supplemental water tap 10.

(10) In addition, in the water passage 3, in particular in the region of the supplemental water tap 10, is arranged at least one backflow element 11. With the backflow element 11, a backflow of water flowing in the water passage 3 can be provided in the region of the supplemental water tap 10 for the pressure-independent removal of supplemental water. By a pressure-independent removal of supplemental water is understood that, irrespective of or independently of the water pressure in the water passage 3, a constant quantity of supplemental water can be conducted to the cavity 8 via the supplemental water tap 10. That is to say, the quantity of supplemental water is here independent from or detached from the pressure conditions prevailing in the water passage 3.

(11) The backflow element 11 is preferably designed such that the cross section Q of the backflow element 11, in the event of rising pressure in the water passage 3, is enlarged. The enlargement is here such that the water quantity fed to the supplemental water tap 10 is substantially constant. Particularly preferredly, the backflow element is designed such that it delivers, over a pressure range from 0.1 to 10 bar, a constant water quantity via the supplemental water tap 10. In the event of falling water pressure, the cross section Q of the backflow element 11 then reduces again, so that, in the event of diminishing pressure, a constant water quantity is removable from the water passage 3 via the supplemental water tap 10.

(12) In the event of rising pressure, the backflow element 11 is deformed, wherein, as a result of the deformation, the said cross section of the water passage 3 enlarges in the region of the backflow element 11. Equally, the cross section of the water passage 3 reduces in the event of falling pressure, whereby the cross section is then likewise reduced.

(13) In the shown embodiment, the backflow element 11 is designed as a disc or is of disc-like configuration. The disc here extends substantially over the total cross section of the water passage 3.

(14) The supplemental water tap 10 is disposed, with respect to a direction R running orthogonally to the disc surface 12, substantially directly in the region of the disc surface 12. A different arrangement is likewise conceivable. It would thus be conceivable for the supplemental water tap 10 to be arranged at a short distance from the backflow element 11. The distance can also, however, be greater.

(15) In the shown embodiment, the backflow element 11, viewed in the direction of flow F of the water in the water passage 3, is disposed after the supplemental water tap 10. That is to say, the water passes firstly through the supplemental water tap 10 and then impinges on the backflow element 11. In the shown embodiment, the backflow is formed in the backflow zone having the reference symbol Z. As a result of this backflow in this zone, the supplemental water tap 10 can be efficiently supplied with the supplemental water. The backflow element 11 is preferably made of a resiliently elastic, in particular of a resiliently elastic plastic, or of rubber or of silicone. Preferably, the backflow element has a Shore hardness of greater than 50 Shore or greater than 60 Shore or greater than 70 Shore.

(16) In the shown embodiment, the backflow element 11 has a plurality of incisions 13. The incisions 13 here extend radially outwards from the centre point of the backflow element 11 and divide the sections of the backflow element into flaps 14. The flaps 14 can then be tilted by the water pressure with respect to the water passage in the direction of flow F. That is to say, the backflow element 11 deforms through tilting of the flaps 14. In the shown embodiment, the incisions 13 extend radially outwards from a central opening 15.

(17) The backflow element 11 is mounted in the water passage 3 in a bearing 16 laterally surrounding the water passage 3. The bearing 16 is here designed as an annular gap and accordingly receives the rim region of the backflow element 11.

(18) In the shown embodiment, the inflow fitting 1 comprises an outlet pipe 17. The outlet pipe 17 here provides parts of the water passage 3, and the exit 5. Through the outlet pipe 17, flush water is able to be delivered into the cistern. The backflow element 11, viewed in the direction of flow F, is disposed before the outlet pipe 17. Preferably, the housing 2 and the outlet pipe 17 form two different parts. That is to say, the outlet pipe 17 is fastened to the housing 2. Between the outlet pipe 17 and the housing 2 is clamped, in the shown embodiment, the backflow element 11. Preferably, the outlet pipe is connected to the housing via a threaded joint 18. Alternatively, a snap joint can also be provided.

(19) In the shown embodiment, the cross section of the water passage 3, viewed in the direction of flow F, extends after the backflow element 11 conically. The conicity is here preferably such that the cross section of the water passage 3 reduces with increasing distance from the backflow element 11. The conical portion ends with a step 19. After this, the cross section of the water passage 3 then enlarges again with increasing distance from the step 19.

(20) In the shown embodiment, the float is mounted with an opening 24 on the outlet pipe 17 such that it is movable on the outside thereof. The float 17 is in connection with a rod 21, which acts on a float lever 20. The float lever 20 acts on the valve 6.

(21) In the shown embodiment, the water is conducted, from the entry 4, firstly past an optional nozzle 25, and then flows to the valve 6, whence the water then flows in the direction of the backflow element 11.

REFERENCE SYMBOL LIST

(22) 1 inflow fitting 2 housing 3 water passage 4 entry 5 exit 6 valve 7 float 8 cavity 9 buoyancy chamber 10 supplemental water tap 11 backflow element 12 disc surface 13 incisions 14 flaps 15 central opening 16 bearing 17 outlet pipe 18 threaded joint 19 step 20 float lever 21 rod 22 outlet 23 passage 24 opening 25 nozzle 26 control bore W supplemental water F direction of flow Q cross section R direction Z zone of backflow