Surface-mounted sanitary fitting for showers or bathtubs

Abstract

Surface-mounted sanitary fitting (100) for showers or bathtubs, with - a fitting base housing (30) having a cold water inlet (36), a hot water inlet (35), and at least one mixed water outlet (33, 34) as well as several internal channels (30.3, 30.4, 30.5, 30.7), - a temperature mixing valve unit (10) and a shut-off and diverter valve unit (20), each arranged in a valve receptacle (30.1, 30.2) in the basic fitting housing (30), wherein the temperature mixing valve unit (10) and the shut-off and diverter valve unit (20) are each inserted into a valve receptacle (30.1, 30.2) opening towards the front side (31) of the basic fitting housing (30), the inner channels (30.3, 30.4, 30.5, 30.6, 30.7, 30.8) are formed between the cold water inlet (36), the hot water inlet (35), the temperature mixing valve unit (10), the mixed water outlet (33, 34) and the shut-off and diverter valve unit (20), characterized in that: - at least one hollow screw (50) with a cover (54) and a shaft (53) with at least one radial inlet (52) and an inner flow channel (51) is inserted from the rear into a rear fitting base housing part (32); - at least one flow channel (30.5) runs parallel to the rear wall of the valve body (30) and thus transversely to its width, the flow channel (30.5) being crossed by the hollow screw (50); and - the inner flow channel (51) of the hollow screw (50) is a transition between two chambers (30.6, 30.8) in the valve body (30).

Description

The invention relates to a clean-on sanitary fitting for showers or bathtubs having the features of the preamble of claim 1.Flush-on sanitary fittings for showers or bathtubs are generally rod-shaped. The regulating unit and the shut-off or changeover valve are arranged in alignment. The handles are arranged to the right and left. This construction is simple to produce. The disadvantage of this construction is that a clean-on sanitary fitting is significantly wider than a single lever fitting. In small shower enclosures, it is therefore often not possible to replace a single lever fitting with a clean-on sanitary fitting in the case of renovating, because otherwise the handles would be arranged too close to the wall or the enclosure door. The known construction, in which the handles are arranged on the right and on the left, is non-economical, since the user must respectively grasp laterally and must thereby carry out the switching on or switching on and the temperature control on the other hand with different hands. Users with a physical manual can only operate such a fitting with great difficulty.A sanitary fitting is clearly more ergonomic, in which the handles are arranged obliquely facing forwards in the manner of a cockpit. In this construction, the body can also be designed so that it is not wider than in a single lever fitting, so that there are no space problems in renovating. In this construction, the arrangement of the control elements on the front side necessarily leads to a plurality of intersecting water channels being present in the interior of the fitting, which is very difficult to produce by casting. In addition, in such complex castings there is the risk of so-called bath entrainment during the electroplating process, because there are a plurality of scooping cavities in the interior of the fitting. These cavities are not self-emptying, so that undesired mixing of galvanofluxes occurs.In the fitting described in DE 10 2018 111 075 A1, an obliquely inclined surface is likewise provided on the fitting base housing, on which surface the operating elements are arranged. In this case, crossing channels are avoided by the fitting body being produced from two separate cast parts. The water-conducting channels are guided into a connecting plane of the two cast parts, so that the flow paths are produced during the connection of the cast parts. Possible problems in electroplating the fitting body are avoided by providing an additional outer housing made of galvanized plastic. The construction with two separate cast parts and an additional housing, however, requires a certain width and depth of the fitting, so that it cannot be used in the above-described renovating cases and in other restricted space conditions.DE 2324023 discloses a flush-mounted sanitary fitting which, for transferring the water between a flush-mounted connection base body and a flush-mounted attachment part, provides a hollow screw having three axially parallel flow channels which do not cross one another. No internal flow channels are also formed in the clean-on attachment part. As a result, the fitting has a large structural depth. It is not suitable for application to water connections lying above plaster.The object of the invention is to specify a clean-on sanitary fitting in the manner of a cockpit, which has a galvanized fitting base housing which is designed such that, in particular, the risk of bath entrainment during electroplating is minimized.This object is achieved by a clean-on sanitary fitting having the features of claim 1.The invention proposes to design a part of the mixed water channel in the form of a hollow screw. This hollow screw is preferably mounted from the bottom or back of the fitting so that it is not visible to the user. By means of this hollow screw, a plurality of inner chambers of the fitting base housing can be bridged without complicated intersections occurring in the cast part. Because the bore for the hollow screw passes through all the inner chambers and channels and lies at the lowest point of the instrument base housing, the galvanofluxes can escape through this bore during the manufacturing process.The hollow screw is preferably made of metal or plastic. It can also be embodied in multiple parts, for example in the form of a decorative locking screw and an inner tube which is inserted into the fitting base housing and cannot be seen from the outside and which performs the water-conducting function.According to a preferred embodiment, the hollow screw is designed in multiple steps. For this purpose, the bore in the fitting base housing has a diameter which is further stepped on each passage through a housing wall. Viewed from the outside to the inside, the diameter of the shank of the hollow screw is reduced. Thus, only a conical enveloping space is occupied by the hollow screw, i.e. the space requirement is greater on the rear side of the housing and is smallest in the end region between the temperature mixing valve unit and the shut-off and reversing valve unit. This allows a significantly reduced width. In particular, it is thereby possible to design the housing front to be laterally recessed, either with obliquely placed surfaces or with a rounding, and to align the valve axes not perpendicular to the mounting plane or to the central axis of the fitting, but obliquely thereto. The inclined position of the axes allows the operator to maintain the hand more natural during operation and also reduces the depth of construction of the fitting, because the operating elements such as levers or knobs can be arranged slightly obliquely in the recessed outer regions.A temperature mixing valve unit and a shut-off and reversing valve unit of conventional design can be inserted into the basic fitting housing. In particular, a thermostatic valve unit is used as the temperature mixing valve unit.The invention is explained in more detail below with reference to the exemplary embodiment shown in the drawings. The figures each show: FIG. 1 shows a clean-on sanitary fitting in a view from the front; FIG. 2 shows the clean-on sanitary fitting in a perspective view obliquely from behind; FIG. 3 shows the clean-on sanitary fitting from above; FIG. 4 shows the clean-on sanitary fitting from below; FIG. 5 shows a fitting base housing in a perspective sectional view from below; FIG. 6 shows the basic fitting housing with valve units in a perspective sectional view from below; FIG. 7 shows the clean-on sanitary fitting in a perspective sectional view from the right; FIG. 8 shows the clean-on sanitary fitting in a perspective view from above, and FIG. 9 shows a hollow screw in a perspective view.FIG. 1 shows a clean-on sanitary fitting 100 from the front. A temperature mixing valve unit 10 in the form of a thermostatic valve unit and a combined shut-off and changeover valve unit 20 are arranged in a fitting base housing 30, of which one operating knob is visible in each case. The control buttons are arranged on a front side 31 of the instrument panel housing 30, which has its greatest depth in the middle and in each case returns somewhat in depth toward the two outer sides.Viewed in the width, a front fitting base housing part 37 extends between the water connections, of which the rosettes 45, 46 are visible. The top side of the instrument base housing 30 is adjoined by a water pipe 2 via which a head shower is fed. On the underside of the fitting base housing 30, a connecting piece 33 for a shower hose 1 is formed.FIG. 2 shows the clean-on sanitary fitting 100 in a perspective view obliquely from behind. A central rear fitting base housing part 32 opens upwards into a connecting piece 34, to which the pipe 2 is attached. The fitting base housing part 32 is located between a hot water inlet 41 and a cold water inlet 42 in order to optimally utilize the available installation space. The view in FIG. 2 also makes clear the design of the front fitting base housing part 37 with a small depth and the curved shape of the front side 31.FIG. 3 is a top view of the clean-on sanitary fitting 100. The central rear fitting base housing part 32 is not only located between the water inlets 41, 42 but is also lowered to such an extent to the rear and to the bottom that S-arches 43, 44 connected to the water inlets 41, 42 together with the associated roses 45, 46 are located above them. The mentioned parts 41..46 form two water feed units 40, 40'. The upper edges of the rosettes 45, 46 identify the position of a wall connection plane W.FIG. 4 is a view corresponding to FIG. 3 of the clean-on sanitary fitting 100 from below. In addition to the connecting piece 33 for the shower hose on the underside of the front fitting base housing part 37, the rear side of the rear fitting base housing part 32 is visible here, which has an opening into which a hollow screw 50 is inserted.A hollow screw 50 is shown in perspective view from the outside in FIG. 9. It consists of a cover 54 and a shaft 53. The cover 54 serves at the same time to seal the opening in the instrument housing part 32 and therefore has no perforations. At the transition between cover 54 and shaft 53, a shoulder 55 with an external thread is provided in order to be able to fasten hollow screw 50 securely in the instrument housing base.The shaft 53 has an axially inner flow channel 51 which is connected to at least one radial bore 52, so that water can enter there and emerge again at the end face of the shaft 53. The shaft has a plurality of grooves 56.1, 56.2, 56.3, 56.4 for receiving sealing rings, in order to seal the cover 54 against the rear side of the rear instrument base housing part and the shaft at the openings of inner walls in the instrument base housing. In the exemplary embodiment shown, the region between the grooves 56.1 and 56.2 is provided for the mixed water feed coming from the thermostatic valve unit. In the section between the grooves 56.2 and 56.3, the cold water inlet channel is crossed. A mixed water outlet channel is crossed between the grooves 56.3 and 56.4. Beyond the groove 56.4, the shaft 53 opens into a mixed water channel which leads to the shut-off and changeover valve unit.The structure of the clean-on sanitary fitting 100 and the function of the hollow screw 50 are clear in particular from the sectional view through the fitting base housing 30 in FIG. 5. This is a perspective view of a sectional plane in which the central axis of the hollow screw 50 lies, namely with a view to the sectional plane from below. A recess 35 in the fitting base housing 30 is assigned to the hot water inlet and a recess 36 for the cold water inlet is located on the opposite side.From the recess 36 for cold water supply, a flow channel 30.5 leads first into the rear fitting base housing part 32 in order to bypass a valve receptacle 30.2 for the shut-off and changeover valve. The flow channel 30.5 then runs parallel to the housing rear wall and crosses the hollow screw 50, but no liquid-conducting connection is formed. Rather, the hollow screw 50 extends through the flow channel 30.5 and is flushed therein. The flow channel 30.5 opens into a valve receptacle 30.1 for a thermostatic valve, which is supplied with cold water radially. A short flow channel 30.7 extends from the recess 35 for the hot water inlet into the valve receptacle 30.1 for the thermostatic valve. The warm water is also supplied radially at the thermostatic valve.The mixed water outlet of the thermostatic valve to be inserted into the valve receptacle 30.1 is located on the rear end side and thus opens into a mixed water chamber 30.6, which is formed in the completely rear region of the dashboard base housing part 32. Through at least one radial bore 52 in the hollow screw 50, the mixed water can flow into an inner flow channel 51 which extends axially over the length of the hollow screw 50 as far as a front end side. In this case, the hollow screw 50 not only crosses the already described flow channel 30.5 for the cold water, but also extends through a mixed water outlet channel 30.4.The mouth of the inner flow channel 51 in the hollow screw 50 is located in a chamber 30.8, which is located directly behind the front side 31 of the fitting base housing 30. The shut-off and reversing valve to be inserted into the valve receptacle 30.2 is subjected to radial flow via the chamber 30.8. Depending on the position of the shut-off and changeover valve, the mixed water is conducted into the mixed water outlet channel 30.3 or into the mixed water outlet channel 30.4. The outlet channel 30.3 is in flow connection with the connecting piece 33 for the shower hose and the mixed water outlet channel 30.4 is in flow connection with the connecting piece 34 for the pipe of the head shower.FIG. 6 is a sectional view for the entire clean-on sanitary fitting 100, reproduced from the same viewing direction and with the same sectional plane as in FIG. 5. only the fitting base housing 30 is cut in this view. The temperature mixing valve unit 10 and the shut-off and changeover valve unit 20 are not cut, as are the hollow screw 50. This view results in the space-saving layout of the three essential elements 10, 20 and 50 used.FIG. 7 shows a further sectional view in which the sectional plane is oriented vertically and runs through the center of the hollow screw 50. Since the hollow screw 50 is not placed exactly in the middle of the fitting base body 30 in the illustrated, preferred embodiment, the connecting pieces 33, 34 are not cut centrally in this view. In the mixing water chamber 30.6, the end face of the temperature mixing valve unit 10 can be seen in the background. It is also visible how far the rear fitting base housing part 32 lowers to below the hot water inlet 41. In addition, the position of the sectional plane in FIG. 5 is marked by the line V-V.FIG. 8 is a perspective view in which all components of the clean-on sanitary fitting 100 are shown in the correct position with respect to one another, wherein the fitting base housing 30 is indicated only with the outer contours and transparently, however.From this illustration, the good utilization of installation space in the preferred embodiment of a clean-on sanitary fitting 100 according to the invention is clear. The hollow screw 50 is placed between the pipe 2 and the shower hose 1 as viewed in the vertical direction. In the horizontal dimension, one of the valve units 10, 20 is located between the hollow screw 50 in the middle and one of the water inlets 41, 42 on the outside. In addition, the valve units 10, 20 are set in a V-shape with respect to one another. Because the valve units 10, 20 are stepped toward the rear, toward the wall connection plane, i.e., decrease in diameter toward the rear, and because the diameters of the different shoulders of the hollow screw 50 decrease simultaneously from the rear toward the front, i.e., in the opposite direction, the hollow screw 50 fits well between the two valve units 10, 20, even if they are positioned very close to one another. This allows a particularly narrow construction.Reference Number:100 Flush-mounted sanitary fitting W Wall connection plane 1 Shower hose 2 Water pipe 2 Pipe 10 Temperature mixing valve unit 20 Shut-off and changeover valve unit 30 Fitting base housing 31 Front side 32 Rear fitting base housing part 30.1 Valve receptacle 30.2 Valve receptacle 30.3 Mixed water outlet channel 30.4 Mixed water outlet channel 30.5 Flow channel 30.5 Cold water channel 30.6 Mixed water chamber 30.7 Short flow channel 30.8 Chamber 33 Connecting piece 34 Connecting piece 35 Recess for the hot water inlet 36 Recess for the cold water inlet 36 Cold water inlet 37 Front housing part 41 Hot water inlet 42 Cold water inlet 50 Hollow screw 51 Axial inner flow channel 52 Radial bore 53 Shaft 54 Cover 55 Shoulder 40, 40' Water inlet units 41, 42 Water inlets 43, 44 S-arcs 45, 46 rosettes 56.1, 56.2, 56.3, 56.4 grooves

Claims

Flush-on sanitary fitting (100) for showers or bathtubs, having - a fitting base housing (30) which has a cold water inlet (36), a hot water inlet (35), and at least one mixed water outlet (33, 34) and a plurality of inner channels (30.3, 30.4, 30.5, 30.7), - a temperature mixing valve unit (10) and a shut-off and changeover valve unit (20) which are each arranged in a valve receptacle (30.1, 30.2) in the fitting base housing (30), wherein the temperature mixing valve unit (10) and the shut-off and changeover valve unit (20) are each inserted into a valve receptacle (30.1, 30.2) which opens toward the front side (31) of the fitting base housing (30), the inner channels (30.3, 30.4, 30.5, 30.6, 30.7, 30.8) are formed between the cold water inlet (36), the hot water inlet (35), the temperature mixing valve unit (10), the mixed water outlet (33, 34) and the shut-off and reversing valve unit (20), characterized in that: - at least one hollow screw (50) with a cover (54) and a shank (53) with at least one radial inlet (52) and an inner flow channel (51) is inserted from the rear into a rear basic fitting housing part (32); - at least one flow channel (30.5) runs parallel to the housing rear wall in the basic fitting housing (30) and thus transversely to the width extension thereof, wherein the flow channel (30.5) is crossed by the hollow screw (50); and - the inner flow channel (51) of the hollow screw (50) is a transition between two chambers (30.6, 30.8) in the instrument body housing (30).Clean-on sanitary fitting (100) according to claim 1, characterised in that the hollow screw (50) is at least singly stepped and / or conical in diameter over the length of its shank (53).Clean-on sanitary fitting (100) according to claim 1 or 2, characterised in that at least one of the valve units (10, 20) is of stepped and / or conical configuration over its length.Flush-mounted sanitary fitting (100) according to one of Claims 1 to 3, characterized - in that a front side (31) of the fitting base housing (30) returns towards the outer sides towards a housing rear wall; - in that the valve units (10, 20) are mounted on the front side (31), the central axes of which are set at an angle of 5° to 30° with respect to one another, and - in that the hollow screw (50), as seen from above, is arranged between the valve units (10, 20) in plan view.Clean-on sanitary fitting (100) according to claim 4, characterised in that the front side (31) is set obliquely to a vertical.Clean-on sanitary fitting (100) according to claim 5, characterised in that the hollow screw (50) is set obliquely at an angle of 30° to 60° to a vertical, and in that a rear fitting base housing part (32), into which the hollow screw (50) is inserted, extends as far as below the water inlet units (40; 40').Flush-mounted sanitary fitting (100) according to one of Claims 1 to 6, characterized in that two inner walls parallel to a housing rear wall are formed in the fitting base housing (30) in order to delimit a flow channel (30.5), which is crossed by the hollow screw (50).Flush-mounted sanitary fitting (100) according to one of Claims 1 to 6, characterized in that three inner walls parallel to a housing rear wall are formed in the fitting base housing (30) for delimiting two flow ducts (30.3, 30.5), which are crossed by the hollow screw (50).Clean-on sanitary fitting (100) according to one of Claims 1 to 8, characterized in that the temperature mixing valve unit (10) is designed as a thermostatic valve unit.

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