EP3516124A1

EP3516124A1 - Drain fitting for a wc flush tank

Info

Publication number: EP3516124A1
Application number: EP17761803.0A
Authority: EP
Inventors: Jürgen Burkhardt; Christian Koch; Sven Wöhler
Original assignee: Grohedahl Sanitarsysteme GmbH
Current assignee: Grohedahl Sanitarsysteme GmbH
Priority date: 2016-08-29
Filing date: 2017-08-29
Publication date: 2019-07-31
Anticipated expiration: 2037-08-29
Also published as: CN109642423A; EP3516124B8; US10851531B2; EP3516124B1; CN109642423B; US20190194922A1; WO2018041400A1; DE102016010335A1

Abstract

The invention relates to a drain fitting for a WC flush tank (1), comprising a drain valve (5), which is made of a drain connector (39) mounted on the flush tank (1) and a stroke-controllable overflow tube (13) that closes a flow passage through the drain connector (5) in the closed position of the overflow tube, and comprising a pneumatic actuator (31) that can be used to move the overflow tube (13) into the open position, in which a quantity of flush water can flow out of the drain connector (5) of the WC flush tank (1), when pressure is applied. According to the invention, negative pressure can be applied to the pneumatic actuator (31) in order to control the stroke of the overflow tube (13) into the open position. The drain fitting has a negative pressure unit (33), in particular a water-conducting negative pressure unit, which is connected to the pneumatic actuator (31) and which generates a negative pressure that acts on the pneumatic actuator (31) upon an activation carried out by a user.

Description

Drain fitting for a toilet cistern

The invention relates to a drain fitting for a toilet cistern according to the preamble of claim 1.

A toilet cistern has in common practice a connected to the water supply mains filling valve and a drain valve. About the example, float-controlled filling valve, the toilet cistern can be filled to a predetermined level with water. The drain valve is usually constructed of a drain pipe mounted on the bottom side drain pipe and a stroke adjustable overflow pipe. The overflow tube in its closed position closes a flow passage through the discharge nozzle. By a user-side pressure actuation of a pushbutton, the overflow pipe can be strokeverstellver in its open position in which a flushing water can flow out of the drain pipe of the toilet cistern. The pushbutton is in a conventional toilet cistern via a mechanical linkage in operative connection with the overflow pipe.

In contrast to this, from EP 1 719 846 A2 a generic waste fitting is known, in which the pushbutton is not connected to the overflow pipe via a mechanical linkage but via a pneumatic system. The pneumatic system has a first bellows positioned on the pushbutton, which is connected via a pneumatic line to a second bellows positioned on the overflow pipe. With a pressure actuation of the push button, the first bellows is compressed and thus generates an overpressure which can be acted on the second bellows. Due to the pressurization of the second bellows expands, whereby the overflow pipe is adjusted to its open position. The above pneumatic system is both space-consuming and component-intensive. The realization of the pneumatic system is therefore associated with a high cost and perform complicated assembly technology.

CONFIRMATION COPY The object of the invention is to provide a waste set for a toilet cistern, which is space-saving compared to the prior art as well as reduced component feasible. The object is solved by the features of claim 1. Preferred embodiments of the invention are disclosed in the subclaims.

In departure from the above prior art is omitted according to the characterizing part of claim 1 in the pneumatic system on a bellows, the hubverstellt when overpressurizing the overflow tube. Rather, the pneumatic system according to the invention has exactly one pneumatic actuator which can be acted upon by a negative pressure for the stroke adjustment of the overflow pipe. The waste set also has a vacuum unit, which is fluidically connected to the pneumatic actuator. In a user-side activation, the vacuum unit generates a negative pressure acting on the pneumatic actuator to perform a stroke adjustment of the overflow pipe.

The pneumatic system may be realized as a bellows, a piston-cylinder unit or as a membrane lifting system. By way of example, the membrane lifting system can have at least one working chamber which can be subjected to negative pressure and which is delimited by a deformable membrane. The deformable membrane can be connected to the overflow pipe. At a negative pressure acting on the working chamber, the membrane may deform and stroke the overflow tube accordingly. With regard to a particularly simple and functional embodiment, the pneumatic actuator can be a bellows, which contracts like an accordion when subjected to a negative pressure and pulls apart like a concertina in the event of a negative pressure release (ie expands).

In a technical implementation, the vacuum unit can be an electrically controllable vacuum pump or a water-conducting vacuum unit, that is, a vacuum nozzle or be a water jet pump. The vacuum nozzle / water jet pump can be connected via a vacuum line to the pneumatic actuator. If the vacuum nozzle / water jet pump flows through water, therefore, air is sucked out of the pneumatic actuator, that is, generates a negative pressure in the pneumatic actuator.

The above water-conducting negative pressure unit can have a throttle point with a flow cross-sectional constriction between its water inlet side and its water outlet side in the manner of a Venturi nozzle. The vacuum line may preferably open at the throttle point in the flow channel of the vacuum unit.

A space-reduced and compact arrangement of the pneumatic system according to the invention is advantageous. Against this background, the pneumatic actuator (that is, for example, the bellows) in the waste set-up direction can be arranged in particular in alignment above the overflow pipe. The pneumatic actuator may preferably be connected via a rigid connecting element on the overflow pipe, which extends, for example coaxially, the overflow pipe upwards. Alternatively and / or additionally, viewed in the drain assembly high direction, the vacuum unit can be arranged in particular in alignment above the pneumatic actuator, whereby a particularly space-reduced design of the pneumatic system is achieved.

The water-conducting vacuum unit may be connected at its water inlet side to a control line which is connectable to the water supply network. The control line can preferably branch off from a supply line leading to a filling valve of the toilet flushing cistern. In this case, the already existing line pressure for the negative pressure generation in the vacuum unit is used without any additional external energy (for example, the user's pressure or electrical energy) would be required. The water-bearing vacuum unit can open with its water outlet directly into the interior of the toilet cistern. The above embodiment variant is particularly advantageous in a toilet repair measure in which the water supply to the toilet cistern is shut off at an angle valve in preparation. In this case, the water supply to the toilet cistern and to the vacuum unit is interrupted. In a conventional toilet cistern, where the push button is connected to the drain valve via a mechanical linkage, the installer must empty the toilet cistern before starting the repair in order to avoid an outflow from the toilet cistern in the event of unintentional push button actuation , According to the invention, such a precautionary emptying of the toilet cistern can be omitted for the following reason: Because of the corner valve shut-off, no water can be passed through the control line, so that the vacuum unit can not generate any negative pressure. The drain valve thus remains reliably closed even in the event of unintentional actuation of the pushbutton.

As already mentioned above, the negative pressure unit can be activated on the user side. In the case of a water-conducting vacuum unit can be arranged for this purpose in the negative pressure unit leading control line, that is, upstream of the water-conducting vacuum unit, a user-actuated control valve. By a user-side actuation of the control valve, the guided through the vacuum unit water flow rate can be adjusted, which in turn correlates with the negative pressure generated in the vacuum unit. By way of example, the control valve may be a time-controlled actuation valve, for example a so-called self-closing valve. In a technical implementation, the control valve may have a stroke-adjustable in a valve housing control piston. The control piston can be adjusted by means of at least one user-operable pushbutton. In its non-actuated position, the control piston is spring-biased to a closed position, in which a control piston valve disk in Dichtanla ge is a housing-fixed valve seat and thereby a flow path is closed by the control valve. When a pressure actuation of the pushbutton via a Tastenhubweg the control piston is moved against the spring biasing force in its open position. In the control piston open position of the flow path is released by the control valve, whereby the water-conducting vacuum unit is flowed through with water. In a pressure relief of the push button, however, the control piston is reset under the action of the spring biasing force on a Rückstellhubweg back to its closed position.

The length of the above Tastenhubweges the pushbutton correlates with a reset time interval within which the control piston is reset after a push-button discharge back to its closed position. Within the reset time interval, the water-carrying vacuum unit flows through the water volume flow and a negative pressure is generated, which acts on the pneumatic actuator. This means that the Tastenhubweg- length has a direct impact on the effluent from the toilet cistern flushing water. To set a maximum possible Tastenhubweges of the pushbutton and thus to set a flushable amount of flushing the user-side pushbutton can be assigned a Hubeinstellglied that sets the maximum Tastenhubweg the pushbutton and thus the reset time interval.

In a technical embodiment, the waste set a first push button, the operation of a large amount of flushing water flows out of the toilet cistern, and have a second push button, the operation of a small amount of flushing water flows out of the toilet cistern. Depending on the operation of the first or second push button, the user can thus determine the amount of flushing water.

The two pushbuttons can be connected to the control piston in a force-transmitting manner, in particular, for example with the interposition of a cross-beam, in such a way that the second push-button remains in its rest position during the pressure actuation of the first push-button. The Tastenhubweg traveled by one of the pushbuttons is thus identical to the piston stroke traveled by the control piston. Each of the two pushbuttons is preferably assigned a respective Hubeinstellglied, with the aid of which the maximum possible Tastenhubwege the first and second push buttons are independently adjustable. By means of such a control valve different amounts of flushing water can be set variably.

The advantageous embodiments and / or further developments of the invention explained above and / or reproduced in the dependent claims can be used individually or else in any desired combination with one another, for example in the case of clear dependencies or incompatible alternatives.

The invention and its advantageous embodiments and further developments and advantages thereof are explained in more detail below with reference to drawings. Show it:

Figure 1 in a rough schematic partial sectional view of a toilet cistern with a filling valve and a drain valve; Figure 2 in a detailed view of a unit of a vacuum nozzle and a bellows;

Figure 3 is a sectional view taken along the sectional plane AA of Figure 1; Figures 4 and 5 are views corresponding to the figure 3 with actuated first push-button and actuated second push-button; FIGS. 6 and 7 are views each showing the pneumatic system in a vacuum

Show exposure to the bellows;

FIG. 8 shows a pneumatic system of the toilet cistern according to a further exemplary embodiment;

Figures 9 and 10, another embodiment of a pop-up waste.

FIG. 1 shows a waste fitting with associated pneumatic system 21 installed in a toilet cistern 1. The drain fitting has the Spülkastenboden 3 to a drain pipe 5, which is not shown in flow communication with a toilet bowl. The discharge nozzle 5 rests with a radially widening circumferential annular shoulder 7 on the opening edge region of a bottom-side outlet opening of the cistern bottom 3. The annular shoulder 7 of the downcomer 5 is extended upward with a circumferential housing wall 9 formed thereon, in which throughflow openings 11 are formed, which are uniformly distributed in the circumferential direction. Radially within and coaxially with the housing wall 9, a stroke-adjustable overflow pipe 13 is arranged, which rests with its radially outer valve disk 15 on a formed on the annular shoulder 7 valve seat 17 liquid-tight. The circulation pipe 13 forms, together with the outlet nozzle 5, a drain valve 19 which can be actuated via the pneumatic system 21 by push buttons 23, 25, which are delimited by a decorative plate 26 in FIG. 1 and installed in a building wall 28. During a pressure actuation of the push buttons 23, 25, the circulation pipe 13 is stroke-adjusted by means of the pneumatic system 21 from a closed position shown in FIG. 1 into an open position (FIGS. 6 and 7).

In the toilet cistern 1, a filling valve 27 is also installed, with which the toilet cistern 1 is filled to a predetermined level with water. The filling valve 27 is connected on the inlet side to a supply line 29 leading to the water supply network. In addition is the filling valve 27 is controlled by means of a float 32, which is arranged vertically adjustable at an inlet pipe 34.

As is further apparent from the figure 1 or 2, the pneumatic system 21 as a pneumatic actuator 31 has a bellows and vacuum unit as a vacuum nozzle 33. The vacuum nozzle 33 is constructed in the manner of a Venturi nozzle and connected on the inlet side to a control line 35 which branches off from the supply line 29. In the control line 35, a control valve 43 is arranged, which can be actuated via the user-operable pushbutton 23, 25. In the case of a push-button actuation, a water flow path from the supply network to the vacuum nozzle 33 is opened in the control valve 43 and the latter is flowed through by a water volume flow rh (FIG. 3 or 6). In this way, a negative pressure is generated in the vacuum line 37, with which the bellows 31 is contracted.

On the outlet side, the vacuum nozzle 33 opens into the interior of the toilet cistern 1. The vacuum nozzle 33 has between its water inlet and water outlet side a throttle point with a flow cross-sectional constriction at which a vacuum line 37 opens into the nozzle channel of the vacuum nozzle 33. The vacuum nozzle 33 and the bellows 31 are connected directly to each other to form a unit B (FIG. 2). For this purpose, the vacuum nozzle 33 in the figure 2, a connection piece 39, through which the vacuum line 37 leads. On the connecting piece 39 of the vacuum nozzle 33, a pipe extension 41 of the bellows 31 is pushed and optionally fixed thereto by means of a mounting clamp, not shown. The bellows 31 is coupled in Fig. 2 with its remote from the pipe socket 41 bellows bottom 45 to a connecting rod 47, which in turn is attached to the upper end of the overflow pipe 13.

The control valve 43 shown in Figure 3, together with a key housing 49, in which the two pushbuttons 23, 25 are arranged, also a structural unit. In FIG. 3, the control valve 43 has a control piston 53 which is lift-adjustable in a valve housing 51 on. The control piston 53 is connected with the interposition of a cross-beam 55 force-transmitting with the two push buttons 23, 25. In the non-use position shown in FIG. 3, the control piston 53 is spring-biased by means of a spiral spring 57 into a closed position. In the closed position shown in FIG. 3, the control piston 53 with its valve disk 59 is in sealing contact with a valve seat 61 fixed to the housing, whereby the flow path through the control valve 43 is closed.

The first and second pushbuttons 23, 25 can be adjusted to an open position via maximum possible key stroke paths hi, h _2, counter to the spring biasing force generated by the spiral spring 57 (FIG. 4 or 5). In the open position, the flow path through the control valve 43 is released. At a pressure relief of each pressed pushbutton 23, 25 of the push button 23, 25 is restored under the action of the spring biasing force of the coil spring 57 back to its closed position. To set the above-mentioned Tastenhubwege hi, h ₂ , the control valve 43 has two

Hubeinstellglieder 63, 65 which are arranged in a stroke direction adjustable in the box housing 49. Each of Hubeinstellglieder 63, 65 is associated with one of the push buttons 23, 25 respectively. With the help of Hubeinstellglieder 63, 65, a maximum possible Tastenhubweg hi, h _{2 of} the pushbutton 23, 25 can be adjusted. The Hubeinstellglieder 63, 65 act as depth stops that limit the stroke of each pushbutton 23, 25.

In the event of a pushbutton relief taking place after the pushbutton actuation, the control piston 53 automatically returns to its closed position under the action of a spring force, namely within a reset time interval. Within the reset time interval, the flow path through the control valve 43 remains open, so that further a water volume flow m is passed through the vacuum nozzle 33 and thereby a negative pressure is generated. The length of the reset time interval correlates with a Tastenhubweg length. This healens that with a large button stroke length the resetting of the pushbutton 23, 25 lasts. lasts longer than a shorter key stroke length. Accordingly, at a large Tastenhubweg length a larger amount of flushing water flow out of the toilet cistern 1 than at a smaller Tastenhubweg length. By separate settings of Hubeinstellglieder 64, 65 thus each of the push buttons 23, 25 each have their own, flowing out of the toilet cistern 1 flushing water amount can be assigned. By way of example, upon actuation of the first pushbutton 23, a small amount of flushing water can flow out of the toilet cistern 1. In contrast, upon actuation of the second pushbutton 25, a larger amount of flushing water can flow out of the toilet cistern 1.

With regard to a compact, space-saving design of the pneumatic system 21, according to the figures, the bellows 31 in the waste set-up direction are positioned in alignment above the overflow pipe 31. In addition, the vacuum nozzle 33 is positioned approximately in alignment above the bellows 31.

FIG. 8 shows a further development of the pneumatic system 21 shown in the preceding figures. In contrast to the preceding figures, a bellows guide 67 is additionally provided in FIG. 8 in order to ensure perfect contraction and expansion of the bellows 31. The bellows guide 67 has a hollow cylindrical, cup-shaped bellows housing 69 which is rotationally symmetrical to a housing axis G and is fixed with its cup bottom 71 to the vacuum nozzle 33. On the outer circumference of the bellows housing 69 guide channels 73 are formed, in which guide pins 75 are guided axially parallel to the housing axis G. The guide pins 75 are attached via transverse webs 77 on the connecting rod 47.

In FIGS. 9 and 10, in contrast to the preceding exemplary embodiments, an additional third push-button 26 is provided which, together with the other two pressure sensors, is provided. buttons 23, 25 is bounded by the decorative plate 30. With a pressure actuation of the third pushbutton 26, a mean amount of flushing water can flow out of the toilet cistern 1. The third pushbutton 26 is, as well as the other two pushbuttons 23, 25, with the interposition of the crossbeam 55 force-transmitting in conjunction with the control piston 53. In addition, the third pushbutton 26 is associated with a Hubeinstellglied not shown, with which the maximum possible Tastenhub the third Pushbutton 26 is adjustable.

As can be seen from FIG. 10, each of the stroke adjusting members is assigned an adjusting wheel 79, which can be rotationally actuated by the user. By means of a rotary actuator, the respectively associated Hubeinstellglied can be adjusted.

LIST OF REFERENCE NUMBERS

1 toilet cistern

3 cistern floor

5 drain connection

7 ring shoulder

9 housing wall

11 flow openings

13 overflow pipe

15 valve plates

17 valve seat

19 drain valve

21 pneumatic system

23, 25, 26 Pushbuttons

27 filling valve

28 building wall

29 supply line

30 decorative panel

31 bellows

32 swimmers

33 vacuum nozzle

34 inlet pipe

35 control line

37 vacuum line

39 connecting piece

41 pipe socket

43 control valve

45 bellows bottom

47 connecting element 49 key housing

51 valve housing

53 control spool

55 crossbar

57 spiral spring

59 spool valve disk

61 housing-resistant valve seat

63, 65 Stroke Actuators rh Water volume flow G Housing axis

67 bellows guide

69 bellows housing

71 pot bottom

73 guide channels

75 guide pins

77 crossbars

79 adjusting wheels

Claims

claims

Drain fitting for a toilet cistern (1), with a drain valve (19), which is constructed of a cistern (1) mounted drain port (39) and a stroke adjustable overflow tube (13) in its closed position a flow passage through the drain port ( 5) closes, and with a pneumatic actuator (31), with which the overflow pipe (13) is adjustable in its open position in a pressurized, in which a Spülwassermenge from the discharge nozzle (5) of the toilet cistern (1) can be flowed out, characterized characterized in that for the stroke adjustment of the overflow pipe (13) in its open position, the pneumatic actuator (31) is acted upon by a negative pressure, and that the drain fitting has a particular water-conducting vacuum unit (33) which is connected to the pneumatic actuator (31) and at a user-side activation generates a vacuum acting on the pneumatic actuator (31).

Drain fitting according to claim 1, characterized in that the pneumatic actuator (31) is realized as a bellows, a piston-cylinder unit or a membrane lifting system having at least one pressurizable working chamber, which is delimited by a deformable membrane, which is in communication with the overflow pipe (13).

Drain fitting according to claim 1 or 2, characterized in that the vacuum unit (33) is a wasserdurchströmbare vacuum nozzle or water jet pump, which is connected to a vacuum line (37) with the pneumatic actuator (31), and that in water-flowed vacuum nozzle (33) or water jet pump Air from the pneumatic actuator (31) is sucked. Drain fitting according to claim 3, characterized in that the vacuum unit (33) has a throttle point with a flow cross-sectional constriction between the water inlet side and the water outlet side, and that the vacuum line (37) opens at the throttle point in the flow channel of the vacuum unit (33).

Drain fitting according to one of the preceding claims, characterized in that the pneumatic actuator (31) contracts under a negative pressure in a stroke direction under stroke adjustment of the overflow pipe (13) in its open position, and that the pneumatic actuator (31) at a negative pressure -Delivery pulls under stroke adjustment of the overflow pipe (13) in its closed position and in particular under gravity.

Drain fitting according to one of the preceding claims, characterized in that the pneumatic actuator (31) in the waste assembly high direction, in particular in alignment, above the overflow pipe (13) is arranged, and in particular the pneumatic actuator (31) with a connecting element (47 ), in particular rigidly connected to the overflow pipe (13).

Drain fitting according to claim 6, characterized in that the vacuum unit (33), in particular in alignment, is arranged above the pneumatic actuator (31) in the drain assembly high direction.

Drain fitting according to one of claims 3 to 7, characterized in that the water-conducting vacuum unit (33) is connected at its water inlet side to a control line (35) which is connectable to the water supply network.

Drain fitting according to claim 8, characterized in that in the control line (35) a user-operable control valve (43) is arranged, and that in a user side actuation of the control valve (43) of the negative pressure unit (33) guided water flow rate (rh) is adjustable, which correlates with the vacuum generated in the negative pressure unit (33).

Drain fitting according to one of the preceding claims, characterized in that the toilet cistern (1) has a filling valve (27) which can be connected on the inlet side to the water supply network and over which the toilet cistern (1) is filled with water.

Drain fitting according to claim 9 or 10, characterized in that the control valve (43) in a valve housing (51) hubverstellbaren control piston (53) which is adjustable by means of at least one user-operable pushbutton (23, 25, 26) and in a closed position is spring-biased, in which a spool valve plate (59) in sealing engagement with a housing-fixed valve seat (61) and a flow path through the control valve (43) closes, and which control piston (53) at a pressure actuation of the pushbutton (23, 25, 26 ) via a Tastenhubweg (hi, h ₂ ) is adjusted against the spring biasing force in its open position, in which the flow path through the control valve (43) is released, and at a pressure relief of the pushbutton (23, 25, 26) under the action of the spring biasing force again is reset to its closed position.

Drain fitting according to claim 11, characterized in that the length of the Tasten- hubwegsweg correlates with the length of a reset time interval within which the control piston (53) is reset after a push-button discharge back to its closed position, wherein within the reset time interval the Vacuum unit (33) with the flow of water flow (rh) is flowed through and a negative pressure is generated. Drain fitting according to claim 12, characterized in that the user-side operated pushbutton (23, 25, 26) of the control valve (43) is assigned a Hubeinstellglied (63, 65), with the maximum possible Tastenhubweg (hi, h ₂ ) of the pushbutton ( 23, 25, 26) and thus the reset time interval is adjustable.

Drain fitting according to one of claims 11 to 13, characterized in that at least one first push-button (23), upon actuation of which a small amount of flushing water flows out of the WC cistern (1), and a second push-button (25) is provided, upon actuation thereof a large amount of flushing water from the toilet cistern (1) flows out, and that in particular a third push-button (26) is provided, upon actuation of an average amount of flushing water from the toilet cistern (1) flows out.

Drain fitting according to claim 14, characterized in that the push-buttons (23, 25, 26) are force-transmitting, in particular with the interposition of a cross-beam (55) on the control piston (53) are connected, in such a way that during the pressure actuation of a push-button (23) of at least one further pushbutton (25, 26) remains in its rest position.

Drain fitting according to claim 14 or 15, characterized in that each of the push buttons (23, 25, 26) is associated with a respective Hubeinstellglied (63, 65), with the aid of the maximum possible Tastenhubwege (hi, h ₂ ) of the respective pushbutton (23 , 25, 26) are independently adjustable.