CN110719982A

CN110719982A - Water closet

Info

Publication number: CN110719982A
Application number: CN201880037955.0A
Authority: CN
Inventors: R·韦斯; M·茨维克尔
Original assignee: Geberit International AG
Current assignee: Geberit International AG
Priority date: 2017-06-09
Filing date: 2018-06-08
Publication date: 2020-01-21
Anticipated expiration: 2038-06-08
Also published as: JP6981594B2; ES2837250T3; SI3412840T1; WO2018224632A1; ZA201907555B; JP2020522629A; PT3412840T; DK3412840T3; EP3412840A1; EP3412840B1; CN110719982B; AU2018280778A1; AU2018280778B2; DE202017005242U1; PL3412840T3; IL270805A

Abstract

The invention relates to a toilet bowl (1) having a WC bowl with a specific bowl interior shape designed for the rotational flow shape of the flushing water, wherein the provision of a second flow path section (7) or a separate second flow path (7) in addition to the prior art leads to an improvement in the avoidance of overflow and thus in particular to greater simplicity in the avoidance of undercuts in the bowl interior shape.

Description

Water closet

Technical Field

The invention relates to a toilet bowl (Wasserklosett), hereinafter also referred to as WC for short.

Background

WC having a WC bowl, a flushing water supply for this and a waste water drain pipe, which is usually connected via a siphon, are common and known. At present, the main additional functions, such as flushing devices, odor extraction devices, etc., are the subject of technical development.

WC has a toilet body which comprises in particular a hollow form open to the top, i.e. a WC bowl, which is usually, but not necessarily, made of ceramic material. Other technical means can be provided in the ceramic part of the toilet body or also in additional parts or behind/under the cover of the ceramic body.

Above or at the upper inner edge of the WC bowl, conventional toilet bodies comprise a so-called flushing rim, i.e. a circumferential flushing water channel, having a downwardly directed inlet opening for injecting flushing water into the WC bowl; with respect to the supply of toilet water to the bowl, the flush rim functions as an annular shower. Furthermore, WC having a rotating flushing water flow within the WC bowl is known, wherein a swirling flow within the bowl is caused by the flushing water entering the bowl substantially tangentially before the flushing water exits through the siphon and waste drainpipe.

With regard to the prior art reference is made to european patent EP 2604761B 1 of the same owner, which relates to a WC bowl internal shape that is asymmetric and that simultaneously produces or assists the rotating motion of the flushing water. This also achieves a good flushing effect with a relatively small amount of flushing water. Another has found that the WC bowl works particularly quietly.

Disclosure of Invention

It is an object of the present invention to provide an improved WC bowl. This object is achieved by claim 1, which claim 1 is set forth in detail below as well as in various preferred embodiments. Preferred embodiments of the device according to the invention and its use are given in the dependent claims. The features contained therein and disclosed in the following description are understood in principle for both inventive categories, but no specific distinction is made between them at all times.

In order to be able to describe the internal shape of the WC bowl and the flushing water flow easily comprehensibly, the description is made based on a coordinate system defined by a top view of the bowl opening. This is done on the basis of a right circular or elliptical (meaning elongate, deformed circular) barrel opening shape. Generally, the shape of the bowl opening is substantially similar to the general bowl interior shape, at least in an upper region of the bowl interior shape. It is therefore advantageous to define the longest inner dimension through the shape of the bowl opening as the longitudinal axis and its middle perpendicular as the transverse axis. In a typical WC bowl this means that the user looks in the direction of the longitudinal axis in the normal sitting position on the WC and that his shoulder extends in the direction of the transverse axis. When mounted on a wall, the longitudinal axis is then generally perpendicular to the wall and the transverse axis extends parallel thereto.

Combining various experiences and experiments of the inventor has led to two important core ideas. The first is that the WC bowl with significant rotary flush flow described in the above-referenced patent is very advantageous in terms of flushing effectiveness, noise and water saving potential, which is also a requirement of other WC bowls with rotary flush flow by other manufacturers. However, unlike conventional WC tubs with typical flushing rims, i.e. a pronounced distribution and similar to shower-type toilets, there is usually a risk in the rotary flushing water flow that the flushing water will overflow over the upper rim of the tub when the speed is too high. This risk is also related to the design of the inward extent of the upper edge of the inner shape of the WC bowl, in addition to the specific configuration of the bowl inner shape and the flow direction resulting therefrom. For example, fig. 5 and 6 of the referenced patent show that while the typical flushing edge is avoided, the barrel shape here still projects inwardly at the upper edge.

Secondly, such a projecting shape forms undercuts, which are disadvantageous in terms of production technology. While a smaller projection, even avoiding undercuts, is advantageous in terms of production technology. But the risk of preventing spillage is thereby increased.

It has also been found that a flushing water flow introduced approximately tangentially to the bowl interior shape can be guided relatively well at steep wall portions of the bowl interior shape, in particular at relatively clearly concave locations, for example at the ends of an elliptical bowl shape connected by a longitudinal axis, for a defined path downstream of the inlet opening, due to its kinetic energy. But now it gradually increases in inclination, tilting downward under the influence of gravity. Where such downwardly inclined flow portions relate to less inclined flow trajectories as described in the cited patents, an almost increased flow shape results. In other words, this downward sloping flow steepness is reflected almost again upward. There is a special risk of spillage precisely in this case, especially if the upper edge of the bowl inner shape is not configured as a distinct undercut.

In this context, it should be mentioned briefly that a flow path is understood in this context as a path-like surface extending in the inner wall of the WC bowl, which is delimited by a concave edge outwards, i.e. in the transition to the wall which is further upwards, and by a convex edge inwards, i.e. in the direction of the further downwards and in the direction of the outlet. The edge is defined by a particularly pronounced curvature in the vertical section, in a mathematical sense by an extreme value of the curvature. The cited EP 2604761B 1 and the examples below give a visual description.

Such a flow track is used to guide or at least assist a specific water flow. The water is annular due to the essentially tangential entry into the interior of the bowl and at the same time is held on the inner wall of the bowl by centrifugal forces, but at the same time is drawn (more or less obliquely) downwards due to the force of gravity, so that a corresponding flow guiding property can be achieved by a change of the shape of the inner wall of the bowl.

The tangential entry direction of the flushing water is predefined by the shape of the flushing water inlet, i.e. by the entry opening of the flushing water and the plumbing connected upstream thereof. Such tangential design of the flushing water inlet itself is in the prior art achievable in different shapes and is commonly used for achieving a rotating flushing water flow in WC tubs.

According to the invention, in addition to the flow path known from EP 2604761B 1, a second flow path or an extension of the known flow path is provided. The second flow trajectory or extended flow trajectory should prevent the flow direction of at least a part of the flushing water from going too far down and thereby reducing or preventing the above mentioned "increase". When a part of the flow is "held" at a certain height by the flow track, the drop in the total flow here or downstream thereof is made less severe, or the flow section extending on or above the second flow track or the extended flow track merges with the flow section running further down.

Based on the above definitions of the longitudinal axis and the transverse axis, the position of the rotational flow movement in the tub and the specific properties of the shape inside the tub is described in terms of an azimuth angle from a specific position in the tub (in top view) to the intersection of the axes, i.e. the angle with respect to the longitudinal axis. For example, the point of the bowl opening closest to the wall is at the longitudinal axis and at an azimuth angle of 0 ° or 180 °. On this basis, the side areas in the vicinity are then at 90 ° or 270 °.

According to the invention, the flushing water is to be directed through the entry opening to a concavely curved region (with respect to the top view) of the inner wall of the WC bowl, where the entry opening is located between 80 ° and 180 ° azimuth angle. Preferably, the entry ports are at an azimuth angle of less than 170 °, 160 °, 150 °, even 140 ° and also preferably at least 90 °. In this case, the flushing water flows out in a direction of greater orientation. In other words, the inlet opening is preferably in the quadrant upstream of the particularly concave curvature of the bowl opening and points to a particularly concave point. The reason is that the centrifugal force acting in a particularly pronounced concave curvature in combination with a certain residual slope (in relation to the vertical profile) of the interior shape of the bowl first of all causes a relatively stable flushing water flow through the curvature, provided that the majority of the interior shape of the bowl expands from the bottom to the top and has a corresponding slope. The exception is that it is generally in the form of an undercut above the rim of the bowl, as described above.

The mentioned and usually particularly pronounced concavely curved region of the WC bowl can be at about 180 °, i.e. at the end point of the longitudinal axis. In a particular case, for example, the lateral barrel shape at this point has two markedly curved concave regions (for example in an angular basic shape with rounded corners), which are not at 180 °, but can also be at different orientation angles, in particular in the range between 150 ° and 210 °, preferably between 160 ° and 200 ° or between 170 ° and 190 °. It need not fill this angular range.

When at this point the flushing water reaches the less curved region of the bowl opening, the risk is increased that undesirably large parts are significantly reduced or reduced in an undesirable manner.

In this case, such a descending flow section can encounter the first flow path or the first flow path section provided according to the invention, the azimuth angle of which extends at least between 90 ° and 270 ° and which is at the same time preferably connected below to the inlet opening in order to be able to guide the water flowing out of the latter. The preferred lower limit of the above angular range is 80 °, 70 °, 60 °, 50 °, 40 °, 30 °, 20 ° and the preferred upper limit is 280 °, 290 °, 300 °, 310 °, 320 °, 330 °, and 340 °.

In order to reduce a reduction in the flow of a part, according to the invention, a second flow path or a second flow path section is provided, specifically between the outer concave edge and the inner concave edge and at the same time above the azimuthally corresponding or azimuthally adjacent section of the first flow path/first flow path section. The second flow path or second portion should be arranged here at least between 310 ° and 340 ° azimuth. A preferred lower limit here is 300 °, 290 °, 280 °, 270 °, 260 °, wherein the second flow path preferably does not start at an angle below 200 °. A preferred upper limit is 345 deg., where the second flow path preferably extends no more than 400 deg. (i.e., more than 40 deg. over 360 deg.) without the second flow path transitioning to the first flow path.

As described above, the flow path known from EP 2604761B 1 can be extended according to the invention, wherein a continuous flow path is maintained, or a second flow path is added. Finally, the difference is whether there is a discontinuity between the two flow tracks or flow track sections, in particular a discontinuity at an azimuth angle of 0 °, as will be explained in more detail below. In the following, this is referred to as the second flow path in the description, wherein this is understood as the second flow path portion of the one-piece flow path for the case without interruption. The same applies to the first flow path, which in the case of the interruption not mentioned is the first part of the flow path and is known per se (in the case of the absence of the second part) from EP 2604761B 1.

The second flow path should therefore not be completely circumferential in particular, but only cover a limited region, i.e. in a position according to the invention where there is a great risk of the water flow running along the inner wall of the tub falling. This applies in particular to the "fourth quadrant" (counting with increasing azimuth angle starting from 0 °). As seen in this embodiment, the second flow path at least partially assists the flushing water flow and thereby prevents the above-described "reflex" mechanism from being apparent on the first flow path.

In this respect, it is irrelevant whether the definition of the 0 value of the azimuth angle is from the front or the rear, wherein the term relates to the position where the WC user is normally seated, and the "rear" means the part of the inner shape of the tub close to the buttocks (relating to the horizontal direction). Furthermore, this point of view is independent of whether the direction of the flushing water flow in the WC bowl is a left or right turn, i.e. whether the azimuth angle is raised clockwise or counterclockwise in top view. It is more common and preferred that the direction of rotation is rotated to the right, i.e. clockwise, as seen from above. Further, it is preferable that the azimuth is calculated from the rear. In this preferred case the flushing water flow is directed from the inlet port forwardly towards the concave curvature of the WC bowl internal shape (and backwards when defining the zero point of the azimuth angle in front). Both are possible, but the variant is preferred in particular in combination with a drain pipe located behind.

In particular, the second flow path according to the invention, i.e. the second shoulder or the extended shoulder of the bowl interior shape, can prevent flushing water from partially escaping from the bowl, even if the bowl interior shape has little or no undercut at its upper edge. It is to be noted here that the flushing water entry port must require an undercut and herein have a "non-undercut" bowl interior shape at the entry port, albeit with an undercut. The area immediately below the upper edge of the inner shape of the toilet bowl is referred to in this case as the position in which the flushing rim is arranged in a typical WC toilet bowl.

In principle, the invention seeks to achieve a shape which is as simple as possible, easy to clean (and therefore smooth) and advantageous in terms of production technology. Thus, as mentioned above, a bowl internal shape without undercuts in the above sense is preferred.

It is preferable to restrict both or said one flow track in the same sense, i.e. to eliminate the other. Although no undercuts are produced by the flow tracks, it is preferred that there is no further flow track, which complicates the shape and does not make the clever design of the flushing water flow simpler by a large number of different flow tracks which are unnecessary from the inventor's point of view. Of course the first flow track may in particular have a relatively large extension of the azimuth angle, but this does not change the fact that it is a continuous integral flow track.

The flow track described by the present invention should direct a major portion of the flushing water flow. This is significantly more applicable to the first flow path than to the second flow path, since only a part of the second flow path, i.e. generally a part flowing somewhat higher along the inner wall of the tub, is detected in the second flow path. Unlike certain structures found in the prior art, the width of the two flow rails is in any case relatively significant, wherein width is understood as the dimension along the inner wall of the WC bowl and perpendicular to the longitudinal extension of the flow rails, i.e. generally pointing downwards with respect to the local direction. The preferred minimum width at the widest point is 12cm for the first flow track and 0.8cm for the second flow track, wherein it is preferred that the values 13cm, 14cm, 15cm for the first flow track and 0.9cm, 1cm, 1.1cm for the second flow track increase gradually in this order.

As mentioned, the second flow path is less useful for directing or assisting the swirling downward flow, but rather for preventing a portion of the water flow from falling excessively. The water flow may preferably extend substantially horizontally in this connection (with reference to its longitudinal direction). In this case, in particular, the center line between the mentioned convex edge and concave edge (in each case the limit value of the curvature) can be used and should preferably have an angle of not more than 15 °, preferably at most 13 °, 11 °, 9 °, 7 °, with respect to the horizontal, along the flow path. Preferably the flow trajectory is slightly decreasing in the direction of flow, i.e. the azimuth angle.

The first flow path in turn corresponds substantially to what is described in the cited european patent 2604761B 1 of the same owner and thus extends obliquely downwards on the one hand and rotates along the shape of the interior of the toilet bowl on the other hand with increasing azimuth angle, thereby assisting the downwardly directed and rotating flushing water flow.

In this respect, therefore, an asymmetrical internal shape of the tub is provided, which is predefined or produces a downward movement through the internal shape of the tub in a spiral-like manner by the first flow path at a deeper position on one side than on the other side. Thus, the very good surface cleaning performance of the rotating flow within the bowl is combined with the relatively significant momentum when entering the siphon. Thus, the kinetic energy of the flushing water, for example caused by the height of the fall relative to the cistern, can be utilized twice. In addition to this, the bowl interior shape design follows the downward trend of water flow caused by gravity and prevents some turbulence when the water flow flows downward independently of the bowl interior shape. Such turbulence reduces the kinetic energy of the toilet flushing water. For similar reasons, the rotary flushing water movement within the bowl known from the prior art is, for example, more effective in surface cleaning than conventional methods comprising conventional flushing water rims, which reduce most of the kinetic energy of the flushing water from the flushing water supply device.

The known predominant tangential velocity component of the toilet flush water entering the bowl from the entry port is related to the projection of the central toilet flush water trajectory onto the horizontal plane. Thus, the flushing water does not leave the inlet opening in the direction of the water level inside the siphon tube, but is inclined thereto, wherein, in general, the exact angle is not important and can depend on the individual shape of the inlet opening and the subsequent first flow trajectory. In particular, the flushing water velocity exiting the inlet opening does not have to be precisely horizontal, but is preferably substantially horizontal.

The WC according to the invention can be implemented with different methods of generating flushing water (in terms of supply at a certain flushing water pressure), in particular with a pressure water line, i.e. without a cistern. However, since the present invention can utilize the limited potential energy of the flushing water in the cistern in a particularly efficient manner, it is preferred to combine a WC with the cistern. This applies in particular to concealed water tanks in the mounting wall behind the WC.

In particular, thanks to the concept of the present invention, a rather small amount of flushing water can be sufficient, which is economically and ecologically advantageous. Preferably, the maximum amount of flushing water is below 6L, preferably below 5.5L, particularly preferably below 5L.

The toilet flushing flow according to the invention (more precisely by rotation and oblique flow therein as described above) allows better wetting and cleaning of those surfaces of the bowl interior shape which are subject to dirt. Thus, the conventional rinsing edge, which was already compared with the shower at the beginning, can be discarded. Since conventional flushing rims are particularly susceptible to dirt and limescale, this can simplify the manufacture of WC bowls and the cleaning thereof, and furthermore, the conventional flushing rim is hardly accessible from the underside. In other words, the present invention enables the bowl to provide a smooth transition from the actual inner surface of the bowl to the upper rim of the bowl (i.e., to those areas of the WC bowl facing upwards, particularly the areas below the WC chime).

In one embodiment of the invention, the (preferably only) inlet opening (which is arranged after the flushing water supply) mentioned several times above can be relatively high, in particular above 5cm and in this order increasingly preferably above 5.5cm, 6cm, 6.5 cm. A high inlet opening enables a large cross-section to be achieved in a flow-favorable manner, which advantageously does not unduly influence the barrel interior shape (i.e. with regard to the flow configuration and its aesthetic appearance) by the inlet opening.

Generally, the flow cross section of the flushing water supply device is preferably large. In particular, in one embodiment of the invention, the flow cross section of the flushing water supply can be greater than 8cm along the length of the flushing water supply inside the WC (i.e. between the entry opening and the transition to the partial pipe outside the WC itself), i.e. in particular in the rear installation wall²Preferably up to more than 9cm²And particularly preferably up to more than 10cm²Or even 11cm². This applies in particular to the access opening. Thereby, the kinetic energy of the flushing water generated by the inclined surface or the pressure line can be utilized particularly well.

It is furthermore preferred that the start of the second flow path is at a distance from the entry opening at a small azimuth angle, in particular preferably at least 60 °, more preferably 80 °, 100 °, 120 °, 130 °. This relates to the case where the first flow path and the second flow path are not integrally connected and the azimuthal angle of the direction toward the flow path increases.

The two flow tracks each form a local reduction of the main inclined portion of the barrel internal shape. Thus, according to a preferred design of the invention, the two flow tracks are not the rear in the shape of the bowl interior, in any case preferably defining the azimuth zero at that location, i.e. flushing water flows forward from the inlet opening. It has been found that an inner wall which runs as smoothly and steeply as possible in the middle in any case may be preferable in respect of the easy-to-soil situation at the rear and it is reasonable for the inventors' point of view to restrict the flow trajectory by not having it pass through the rear middle. For a detailed explanation, refer to this example. In which case the first and second flow tracks are separated from each other.

Furthermore, it has been found that the second flow track may extend below a relatively steep portion of the shape of the interior of the bowl. Thus, an inclination angle of at least 70 °, even 75 ° with respect to the horizontal in this portion on the second flow track is preferred, more precisely between the 310 ° and 340 ° azimuth angles and preferably along the entire longitudinal length of the second flow track. It is also preferred that the above applies to a part of the length of the second flow path or to the entire length thereof and to the entire part of the barrel interior shape, to be precise up to the upper edge or to the rounding forming the transition to the upper side of the WC body.

Furthermore, a relatively pronounced steep slope in the central rear region of the WC bowl internal shape is preferred, in particular at least below it up to the water level in the siphon and up to the mentioned transition to the bowl upper side. The mentioned angle values are also taken into account here.

Finally, such a steep slope on the opposite side, i.e. in the middle of the front, i.e. with the same angle value, is also particularly preferred, in particular below the first flow path (i.e. downward from the convex edge) which is preferably present here, up to the water level in the siphon.

What has been said about steep walls in partial height applies particularly preferably to the entire bowl interior shape.

The steep wall contributes to a good cleaning effect and a sufficient downward water flow tendency. The water flow should therefore generally flow into the siphon with a pronounced downward tendency so that the siphon can be flushed well.

The second flow path or the second flow path portion is preferably relatively high in a multiple of the angular range between 310 ° and 340 °, to be precise in particular on the first flow path (first flow path portion), which for this purpose likewise preferably extends over an azimuth angle of 270 ° to a greater azimuth angle and into an azimuth angle of 310 ° or into an azimuth angle of 310 °. The two flow tracks (sections) are then spaced apart from each other and stacked one on top of the other.

Preferably, the second flow path (second flow path portion) is here at least 3cm higher than the first flow path (first flow path portion), wherein it is preferred that the lower limit increases gradually by 3.5cm, 4.0cm, 4.5cm, 5.0 cm.

In any case, the second flow path or the second flow path portion is in the described azimuthal range between 310 ° and 340 °, preferably above the lower edge of the entry opening for the flushing water, i.e. relatively higher. Preferably, the lower edge is at least approximately at the same level as the entry of the first flow path at which the water projects onto the first flow path.

The invention preferably achieves a WC bowl which in any case has only one single inlet opening for flushing water in the upper region, i.e. above the first flow path. In the prior art, variants with a plurality of access openings exist. This makes the WC body as a whole significantly complicated and does not really achieve a good flushing effect. Preferably, this also applies to the remaining barrels below the first flow rail. This advantageously eliminates the need for a nozzle opening in the vicinity of the siphon, which nozzle opening is possible in the prior art for improving the drainage efficiency. The reasons are as above, among others, helping to limit the overall water consumption.

Drawings

The invention is explained in more detail below on the basis of exemplary embodiments, wherein the individual features are also essential for the invention in other combinations and are included within the scope of the invention.

Fig. 1 and 2 show perspective top views looking into a WC bowl according to the invention from the upper right front side or from the upper left front side, the WC bowl being in grey scale to clearly show the three-dimensional shape;

figure 3 shows a side view of the right half of the WC bowl in figures 1 and 2 in a longitudinally sectioned state;

fig. 4 shows a side view of the WC bowl from fig. 1 to 3, but without grey scale and in a state of transverse section, specifically in the direction of the viewing angle looking to the rear and in a simplified embodiment;

FIG. 5 shows the embodiment of FIG. 4 in a side view at the same height as FIG. 3, side by side, but without the grayscale;

fig. 6 shows the embodiment of fig. 4 and 5 in a top view, together with an azimuth setting, which is also imaginary for understanding the first embodiment.

Detailed Description

Fig. 1 to 6 show the invention with two WC tubs, wherein in the first exemplary embodiment of fig. 1 to 3 the flushing device for installing the flushing WC is designed and in the second exemplary embodiment of fig. 4 to 6 the corresponding recesses and openings are omitted. These differences are not essential to the invention, but it is stated that the invention can also be very advantageously combined with flushing WC.

Fig. 1 and 2 show in perspective oblique views a WC bowl 1 of a first embodiment, having a normal bowl opening 2, a recess 3 for mounting the rear side of the flushing device (not shown), i.e. to the right above the upper side in fig. 1 and to the left above in fig. 2, and a depression 4 of the WC bowl around the upper edge of the bowl opening 2 at the rear of the bowl rim for passing through a flushing arm (not shown) of the flushing device. The internal shape of the WC bowl 1 visible through the bowl opening 2 is explained below.

This internal shape is firstly equivalent to the WC bowl known from EP 2604761B 1, which is cited multiple times, wherein an approximately helical-shaped first flow path 5 is provided, which in this case starts at an azimuth angle of about 10 ° and extends almost completely around up to an azimuth angle of about 350 ° in a continuously downwardly inclined shape with the widest point at an azimuth angle of 180 °, i.e. again rearwardly, but slightly leftwards. Its function is equivalent to that described in the cited prior art and is set forth in the preceding part of the description, and therefore need not be described in detail.

However, unlike the cited prior art, the entry opening 6 for the flushing water is not directed to the rear (slightly offset to the right) and to the left as in the prior art, but rather begins at an azimuth of approximately 100 ° on the side and points forward, i.e. toward a greater azimuth. The flushing water is thus mounted on the first flow track, but not at its beginning (at 10 °). In addition, reference may be made to fig. 6 for a better understanding of the azimuth angles mentioned herein.

In addition to the prior art mentioned, it is also evident in the rear left corner, i.e. in fig. 1, that a second flow rail 7 is provided, in this connection a further shoulder in the inner wall of the tub above the first flow rail 5. The second flow path 7 is also defined strictly as the inner wall area between the (upper and outer) concave edge and the (lower and inner) convex edge. The second flow track 7 extends between an azimuth angle of about 250 ° and about 350 °. The second flow path is likewise designed here to be slightly inclined downward, to be precise with an approximate inclination of approximately 5 ° in the horizontal viewing direction (with respect to the center line (not shown) between the convex edge and the concave edge). The second flow path is about 1.2cm wide at its widest point, but here clearly no first flow path 5 is smooth, i.e. has an angle of about 48 ° to the horizontal at the most gentle point. The first flow track 5 thus has an inclination of only about 11 ° with respect to the horizontal at a maximum width of 16cm, for example at 180 °. The width mentioned here relates to the distance between the edges mentioned (the most convex and the most concave lines), specifically as the linear distance between them in the downward-sloping direction, i.e. the minimum distance.

Whereas the inner wall of the bowl above and below the second flow track 7 is steep on the right side with an inclination of about 80 ° to the horizontal, especially even in the case of an azimuth angle of 0 °. As shown in particular in fig. 3 and 4, the bowl wall from here onwards becomes steeper and has an inclination of about 89 ° at an azimuth angle of 180 °. Whereby the inclination just avoids undercuts.

The overall barrel interior shape is thus free of undercuts as shown in the figures, in particular at the upper edge (naturally except for the inlet opening 6).

In this embodiment, the two

flow tracks

5 and 7 have a spacing of about 6cm, measured as the track width, i.e. between the convex edge of the upper flow track 7 and the concave edge of the lower flow track 5 and in the direction of the immediate inclination. The second flow path 7 is thus significantly higher relative to the first flow path 5.

It is conceivable from the figures that the water flow coming out of the inlet opening 6 runs on the first flow path 5 due to centrifugal force mostly along steep inner barrel walls and is brought in this way through (in vertical plan view) concave inner barrel walls to the other side, i.e. to the left. Experience has shown that the water flow on the left tends more and more to fall due to gravity and at the same time impinges in particular on the part of the first flow path 5 at a very small azimuth angle of about 10 ° to 90 °, but also on the opposite part of the first flow path 5 at a very large azimuth angle of about 300 ° to 350 °. This causes a reflex-like flow behavior, where part of the flushing water clearly tends upwards and can escape from the bowl 1.

If this phenomenon is attenuated or prevented at this time because this downward trend of the second flow path 7 is blocked by a certain obstacle in the shown azimuth range, in particular between 310 ° and 340 °, an undercut-free bowl interior shape with a flow behavior of flushing water, but without the risk of overflow, can be achieved. The azimuthal extent of the first flow path 5 and the gentle slope in the vertical section (through the water stop level in the drain pipe in fig. 3) are desirable again in order to promote the rotational behavior of the flushing water flow as much as possible and to achieve optimum wetting of the bowl inner wall with the smallest possible amount of flushing water.

Fig. 4 shows a side view of the rear region of the internal shape of the tub on the one hand and a sectional view of the tub on the other hand. The sectional plane passes through the water-blocking level, indicated with 8, in the lower region of the WC bowl. The second flow track 7 can be seen in the left part of the barrel inner shape and the first flow track 5 can be seen in the right part. Both are shown by the boundary lines of the CAD program, respectively, with the surface represented by a cut contour that is straight in the vertical section (through the water stop level 8), for example a steep inner wall of the barrel above the flow tracks 5 and 7, separated from the curved surface. In this connection it can be seen that the two

flow tracks

5 and 7 actually have a straight middle strip, to which curved strips are connected at the upper and lower part, respectively.

Fig. 6 shows the second embodiment of fig. 4 and 5 in a top view with an azimuthal division and several values. In particular, it can be seen that 0 ° corresponds to the rear middle of the internal shape of the tub and 180 ° corresponds to the front middle. It can be seen that the azimuthal range of the flushing water entry openings as defined in the claims is between 80 ° and 180 °. It can also be seen that the azimuth range of the front part, in which there is a concave curvature (not necessarily in the whole angular range) according to the claims, is between 150 ° and 210 °, towards which the incoming flushing water is directed. The smallest area of the flow path can furthermore be seen between 90 ° and 270 °. Furthermore, with a slight offset in the clockwise direction with respect to the line shown at 300 ° and with an offset in the same direction around the line at 330 °, there is a limit to the minimum extent (between 310 ° and 340 °) of the second portion of the second flow path or of the second flow path, which limit should not exceed an angular range of between 230 ° and 90 ° according to the claims.

Fig. 6 additionally shows the interior shape of the tub, as explained with reference to the preceding figures, in a plan view, wherein reference numerals are not indicated in order to avoid complexity.

Claims

1. A water closet WC having a WC bowl (1) and an elliptical or circular bowl opening (2) as well as an entry opening (6) for flushing water, wherein a longitudinal axis running in the longitudinal direction of the ellipse and a transverse axis running perpendicular thereto and in the middle define a midpoint in top view and an azimuth angle is defined starting from the longitudinal axis and this midpoint, wherein the entry opening (6) for flushing water is arranged between 80 DEG and 180 DEG with respect to the azimuth angle and points in the direction of the greater azimuth angle, wherein the tangential entry direction of the flushing water is arranged in top view and with respect to the shape of the bowl opening (2) such that the flow of flushing water at the inner wall of the WC bowl (1) after entering the WC bowl (1) through the entry opening (6) involves a concave inner wall curvature in top view with respect to the azimuth angle of 150 DEG to 210 DEG, wherein the WC bowl (1) has a flow trajectory (5) for the flushing water defined in a vertical cross-sectional view in the inner shape of the WC bowl (1) between a concave edge outside and a convex edge inside with respect to a midpoint, said flow track is connected at the lower part to the inlet opening and extends at least between 90 and 270 with respect to the azimuth angle, characterized in that the flow trajectory (7) is also arranged between an azimuth angle of 230 DEG and 90 DEG over 360 DEG, but not beyond, but at least between 310 and 340 azimuthal angles, the flow path (7) is also defined in the interior shape of the WC bowl (1) in vertical section between a concave edge on the outside and a convex edge on the inside with respect to the center point and is higher than the other part of the previously described flow path (5) at the same orientation angle.

2. The toilet WC according to claim 1, having an upper edge of said WC bowl (1) which is not undercut inwards, in particular having a WC bowl (1) which is not undercut except for said inlet opening (6).

3. The toilet WC according to claim 1 or 2, having only flow tracks (5, 7) as claimed in claim 1, i.e. no other flow tracks.

4. The toilet WC according to any of the preceding claims, wherein the width of the flow trajectory (5) between 90 ° and 270 ° azimuth angle at its widest point is at least 12cm and/or the width of the flow trajectory (7) between 310 ° and 340 ° azimuth angle at its widest point is at least 0.8 cm.

5. The toilet WC according to any of the preceding claims, wherein the second flow trajectory (7) extends horizontally with a maximum deviation of +/-15 °, preferably substantially inclined downwards with increasing azimuth angle.

6. The water closet WC according to any of the preceding claims, wherein a flow trajectory (5) between 90 ° and 270 ° azimuth extends obliquely downwards and thereby assists a downward movement of flushing water entering through said inlet opening (6), wherein a portion of the flow channel (5) between 90 ° and 270 ° azimuth is higher next to said inlet opening (6) than next to the remaining flow trajectory (7) between 310 ° and 340 ° azimuth.

7. The toilet WC of any one of the preceding claims, wherein the flow trajectories between 310 ° and 340 ° azimuth and the flow trajectories between 90 ° and 270 ° azimuth continuously transition into each other over 0 ° and thereby form one flow trajectory overall.

8. The toilet WC according to any of the claims 1-6, wherein the 0 ° azimuth is back, i.e. near the buttocks, with reference to the sitting position of the WC user and there are no flow tracks (5, 7) in the 0 ° position, wherein the flow tracks (5) between 90 ° and 270 ° azimuth and the flow tracks (7) between 310 ° and 340 ° azimuth are two separate flow tracks (5, 7).

9. The water closet WC according to any of the preceding claims, wherein the WC bowl interior shape has a steep slope of at least 70 ° with respect to the horizontal over a flow trajectory (7) between 310 ° and 340 ° azimuth.

10. The toilet WC according to any of the preceding claims, wherein the 0 ° azimuth is back, i.e. near the buttocks, with reference to the sitting posture of the WC user, and wherein the interior shape of the WC bowl (1) has a steep slope of at least 70 ° with respect to the horizontal between the siphon water level upper edge (8) and the upper transition to the upper side of the bowl at the 0 ° azimuth.

11. The toilet WC according to any of the preceding claims, wherein an azimuth angle of 0 ° is back, i.e. near the buttocks, with reference to the sitting position of the WC user, and wherein the inner shape of the bowl (1) at the opposite location, i.e. at an azimuth angle of 180 °, has a steep slope of at least 70 ° with respect to the horizontal between the convex edge defining the flow trajectory (5) and from there down to the siphon water level upper edge (8).

12. The toilet WC according to any of the preceding claims, wherein the flow trajectory (5) between 90 ° and 270 ° azimuth angle is continuously elongated towards the larger azimuth angle and extends at least partially, but spaced therefrom and below it, when the azimuth angle is equal to the flow trajectory (7) between 310 ° and 340 °.

13. The water closet WC according to any of the preceding claims, wherein the flow trajectory (7) between 310 ° and 340 ° azimuth is generally higher than the lower edge of said entry opening (6) for flushing water.

14. A toilet WC device having a toilet WC according to one of the preceding claims and a cistern, preferably a concealed cistern, preferably having a flushing water volume below 6L.

15. Use of a toilet WC or a toilet WC device according to any one of the preceding claims for flushing, wherein said flushing water is moved in rotation along said flow trajectory (5) starting from said inlet opening (6) and at the same time a portion of flushing water is guided on a flow trajectory (7) between 310 ° and 340 °.