DE102020102660A1 - Delay switch and how it works - Google Patents

Abstract

The invention relates to a delay switch and its mode of operation. The delay switch comprises a control valve 100, a discharge valve 200, an air generator 300, a needle 110, a spring 120 and an air supply line 400. The control valve 100 has a bellows. An air outlet of the air generator 300 is connected to the air supply line 400, in which a check valve 410 is arranged. The gas supply line 400 is also connected to the bellows, the bellows communicating with the discharge valve 200. When the bellows is inflated, the needle 110 is carried along by the bellows and is thus displaced linearly in a first direction, so that the delay switch is switched to the open state. When the bellows is emptied, the needle 110 is displaced linearly in a second direction due to the spring 120 and the delay switch is thus switched to the closed state. The invention allows simple installation.

Description

The invention relates to a delay switch and its mode of operation.

Flush valves are widely used in toilet flushing for household purposes or for public places. A flush valve includes a valve body, a float valve and a switch that drives the float valve and thus causes the float valve to move. There are currently mainly two types of switches on the market, the simple mechanical drive and the electromagnetic drive.

A simple mechanical drive is out of the CN2033412U from February 25, 1988 and includes a water-saving hand or foot operated flush valve. The purge valve includes a valve body, a float valve and a push rod.

A high pressure chamber and a low pressure chamber are provided in the valve body. When the push rod is in a first state, a sealing ring on the side wall of the push rod blocks the connection between the high pressure chamber and the low pressure chamber. By pressing the push rod, the push rod is switched to a second state and thus the high pressure chamber is connected to the low pressure chamber. Furthermore, the float valve moves under the action of a pressure difference between both sides to perform a flush. With such a construction, the push rod must be attached to the valve body as a drive member. When pressed, it is possible that water in the valve body is contacted directly, which is unsanitary. In addition, the push rod must be exposed for pressing, so that the installation of the flush valve is significantly restricted.

The electromagnetic actuator, also known as a solenoid valve, works direct-acting, step-direct-acting or pilot-operated. A direct acting solenoid valve includes a valve body, a float valve and a coil which drives the float valve and thus causes the float valve to move. A water inlet channel and a flushing channel are provided in the valve body. If the float valve is in a first state, it blocks the opening of the flushing channel under the action of a spring force. When a voltage is applied, the float valve is switched to a second state in which the coil generates a magnetic field. This pulls the float valve against the spring force and releases the flushing channel. This will cause a rinse. With such a structure, the material of the float valve must be ferromagnetic to be attracted. The material of the valve body and the medium in the valve body must also meet certain requirements.

In summary, it is necessary to develop a drive switch that allows easy installation and only has to meet a few material requirements.

The invention is therefore based on the object of providing a delay switch and its mode of operation which are intended to avoid the disadvantages of the prior art.

The task is solved by a delay switch with two working states, i.e. an open state and a closed state, the delay switch comprising a control valve, a bleed valve (air bleed valve), an air generator, a needle, a spring and an air supply line, the control valve comprising a bellows, an air outlet of the air generator being connected to the air supply line , in which a check valve is provided, the air supply line being connected to the bellows downstream of the check valve, the bellows communicating with the discharge valve, the needle being carried along by the bellows during inflation of the bellows and thus being displaced linearly in a first direction, so that the delay switch is switched to the open state, and the needle is displaced linearly in a second direction during an emptying of the bellows due to an action of the spring, so that the delay switch is switched to the closed state .

In a preferred embodiment, the control valve also comprises a control housing and a sliding cover, one end of the control housing being open and the bellows being arranged in the control housing, the sliding cover covering the open end of the control housing and being able to move linearly back and forth relative to the control housing , and wherein the needle is directly or indirectly connected to the sliding cover and is linearly movable synchronously with the sliding cover.

A preferred embodiment is characterized in that the sliding cover and the needle are displaced from the bellows during inflation of the bellows and move along the straight line against the action of the spring in the first direction, and in that the sliding cover and the needle move during the Move the bellows emptying along the straight line in the second direction due to the displacement by the force of the spring.

A preferred embodiment is characterized in that the control valve further comprises a holder and the lower end of the control housing is open, the holder being arranged on top of the control housing, that connecting rods are arranged symmetrically on both sides of the sliding cover, which are connected to extension arms, wherein the extension arms are located on either side of the holder, the holder is connected to the lower end of the needle, and the spring is arranged between the holder and the control housing and biases the holder such that the holder moves upward .

A preferred embodiment is characterized in that the drain valve comprises an upper cover and a lower cover, between which an air duct is enclosed, an air inlet duct being provided on the lower cover, which is connected to the air duct and the air supply line, that the upper cover is provided with a plurality of fine needle-like vents through which the air duct is vented and that the upper lid is rotatable relative to the lower lid, wherein one or more of the fine needle-like vents can communicate with the air channel due to a rotation of the upper lid.

In a preferred embodiment, the delay switch further comprises an air accumulator, a first, a second and a third branch branching off downstream of the check valve from the air supply line, and the first branch branch having the bellows, the second branch branch having the drain valve and the third branch branch the air reservoir is connected.

In a preferred embodiment, a pneumatic 3-way shuttle valve is arranged in the second branch, the pneumatic shuttle valve being connected in three interfaces to the air generator, the drain valve and the check valve, the interface connected to the drain valve being closed when through the pneumatic shuttle valve air is blown in, and the interface connected to the air generator is closed after the blowing process by the pneumatic shuttle valve has ended.

• Eine Nadel kann sich linear hin und her bewegen, wobei in einem normalen Zustand eine Feder eine elastische Kraft erzeugt, die die Nadel vorspannt und eine lineare Bewegung der Nadel bewirkt, so dass der Verzögerungsschalter in einen Schließzustand umgeschaltet wird, in dem ein Wasserweg gesperrt wird, wobei ein direkt oder indirekt mit der Nadel verbundener Faltenbalg durch einen Lufterzeuger aufgeblasen wird, und wobei beim Aufblasen des Faltenbalgs der Faltenbalg die Nadel derart mitnimmt, dass sich die Nadel linear in einer umgekehrten Richtung bewegt und dadurch der Verzögerungsschalter in einen Öffnungszustand umgeschaltet wird, in dem der Wasserweg frei gegeben ist, wobei der Faltenbalg mit einem Ablassventil verbunden ist, an dem feine nadelartigen Entlüftungsöffnungen für eine Entlüftung vorgesehen sind, und wobei die Nadel den Wasserweg frei hält, bis die Entlüftung des Ablassventils abgeschlossen ist.

The delay switch works as follows:

• A needle can move back and forth linearly, with a spring, in a normal condition, generating an elastic force that biases the needle and causes the needle to move linearly so that the delay switch is switched to a closed condition in which a water path is blocked , wherein a bellows connected directly or indirectly to the needle is inflated by an air generator, and wherein when the bellows is inflated, the bellows entrains the needle in such a way that the needle moves linearly in a reverse direction and thereby the delay switch is switched to an open state, in which the water path is open, the bellows being connected to a drain valve, on which fine needle-like ventilation openings are provided for ventilation, and the needle keeping the water path clear until the ventilation of the drain valve has been completed.

A preferred embodiment is characterized in that the bellows is further connected to the air accumulator, the air generator simultaneously supplying air to the bellows and the air accumulator, that an air outlet of the air generator is connected to the air supply line in which a check valve is provided, and that three branches are branched off from the air supply line downstream of the check valve and are each connected to the air accumulator, the bellows and the drain valve.

In a preferred embodiment, a pneumatic 3-way shuttle valve is provided in the second branch, the pneumatic shuttle valve being connected in three interfaces to the air generator, the drain valve and the check valve, the interface connected to the drain valve being closed when through the pneumatic shuttle valve air is blown in, and the interface connected to the air generator is closed after the blowing process by the pneumatic shuttle valve has ended.

• Bei dem erfindungsgemäßen Verzögerungsschalter sind der Lufterzeuger und der Faltenbalg durch einen Schlauch verbunden. Die Drückeinrichtung ist separat von der antreibenden Nadel. Das Steuerventil kann entweder freigelegt werden oder der Schalter kann in die Wand eingelassen sein, wodurch die Installationsanforderungen stark reduziert werden. Aufgrund des pneumatischen Antriebs kann im Gegensatz zum bekannten Magnetventil das Schwimmerventil aus einem anderen Material als ferromagnetisches Material bestehen.

This technical solution has the following advantages over the prior art:

• In the delay switch according to the invention, the air generator and the bellows are connected by a hose. The pushing device is separate from the driving needle. The control valve can either be exposed or the switch can be embedded in the wall, greatly reducing the installation requirements. Due to the pneumatic drive, in contrast to the known solenoid valve, the float valve can be made of a different material than ferromagnetic material.

• 1 eine schematische Darstellung eines Verzögerungsschalters gemäß einem ersten erfindungsgemäßen Ausführungsbeispiel,
• 2 eine schematische Darstellung eines erfindungsgemäßen Steuerventils,
• 3 eine Schnittansicht eines erfindungsgemäßen Steuerventils,
• 4 eine Explosionsansicht eines erfindungsgemäßen Steuerventils,
• 5 eine Schnittansicht eines erfindungsgemäßen Auslassventils,
• 6 eine Explosionsansicht eines erfindungsgemäßen Auslassventils,
• 7 eine schematische Darstellung eines Verzögerungsschalters gemäß einem zweiten Ausführungsbeispiel,
• 8 eine schematisches Darstellung eines erfindungsgemäßen Luftspeichers, und
• 9 eine schematische Darstellung eines Verzögerungsschalters gemäß einem dritten Ausführungsbeispiel.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the attached drawing. The drawing shows in:

• 1 1 shows a schematic illustration of a delay switch according to a first exemplary embodiment according to the invention,
• 2nd 1 shows a schematic illustration of a control valve according to the invention,
• 3rd 2 shows a sectional view of a control valve according to the invention,
• 4th 2 shows an exploded view of a control valve according to the invention,
• 5 2 shows a sectional view of an exhaust valve according to the invention,
• 6 2 shows an exploded view of an exhaust valve according to the invention,
• 7 1 shows a schematic illustration of a delay switch according to a second exemplary embodiment,
• 8th a schematic representation of an air reservoir according to the invention, and
• 9 is a schematic representation of a delay switch according to a third embodiment.

With reference to 1 to 6 a delay switch has two working states, namely an opening (working) state and a closing (working) state. The delay switch includes a control valve 100 , a drain valve 200 , an air generator 300 , a needle 110 , a feather 120 and an air supply line 400 . The control valve 100 includes a bellows 130 . An air outlet of the air generator 300 is with the air supply line 400 connected. In the air supply line 400 is a check valve 410 intended. The air supply line 400 is downstream of the check valve 410 with the bellows 130 connected. The check valve 410 effectively prevents air from entering the air generator 300 flows back. The drain valve 200 communicates with the bellows 130 . During inflation of the bellows 130 becomes the needle 110 entrained by the bellows and thus moves linearly in a first direction, so that the delay switch is switched to the open state. The needle 110 becomes during an emptying of the bellows 130 through the effectiveness of the spring 120 shifted and moves linearly in a second direction, so that the delay switch is switched to the closed state.

The control valve 100 further includes a control housing 140 and a sliding lid 150 . The lower end of the control housing 140 is open. In the control housing 140 is the bellows 130 arranged. The sliding lid 150 covers the open end of the control housing 140 and can be relative to the timing case 140 move linearly back and forth. The needle 110 is directly or indirectly with the sliding cover 150 connected and moves linearly in synchronism with the sliding cover 150 . While inflating the bellows 130 become the sliding cover 150 and the needle 110 through the bellows 130 shifted and move against the effectiveness of the spring 120 in the first direction along a straight line. During bellows emptying 130 the sliding cover move 150 and the needle 110 through the effectiveness of the spring 120 along a straight line in the second direction.

The control valve 100 further includes a holder 160 . The keeper 160 is located on the top of the control housing 140 . The keeper 160 is directly or indirectly with the sliding cover 150 connected. In this embodiment there are connecting rods 151 symmetrical on both sides of the sliding cover 150 arranged. The connecting rods 151 and the sliding cover 150 can be releasably locked together or can be formed in one piece (in one piece). On both sides of the holder 160 an extension arm is arranged with the connecting rod 151 connected is. The lower end of the needle 110 is with the holder 160 connected. The feather 120 is between the holder 160 and the control housing 140 arranged and tensioned the holder 160 forward and thus causes the holder to move upward. The needle 110 is on the holder 160 arranged. In the holder 160 a mounting hole is provided. The mouth of the fastening opening is conical. At one end of the needle 110 a spherical head is formed, which is snapped into the fastening opening. At another end of the needle 110 becomes a waterproof rubber pad 111 appropriate. The needle 110 is provided with a locking groove, and one side of the waterproof rubber pad 111 is snapped into the locking groove.

The control housing 140 includes a base and a sleeve. The base is connected to the upper end of the sleeve. The sliding lid 150 is connected to the lower end of the sleeve.

The feather 120 is between the base and the holder 160 supported. Recesses are provided symmetrically on both sides of an opening at the lower end of the sleeve, each of which has a place for connecting points of the connecting rod 151 with the sliding lid 150 create. The base includes a base plate that is locked in place with the sleeve. The base plate is formed in the middle with a pin, which is a plug connection with one end of the spring 120 manufactures. The bottom of the holder 160 is provided with a recess. Another end of the spring 120 is inserted into the recess. The bottom plate interacts with the sleeve in such a way that one end of the bellows 130 trapped becomes. Walls are arranged symmetrically on both sides of the upper side of the base plate, a passage being formed between the two walls. The outer ends of the extension arms protrude through the passage. The keeper 160 is floating between the two walls.

Furthermore, a sealing sleeve is provided, through which the needle 110 goes. The sealing sleeve is located above the holder 160 . A support is provided on each of the two walls. Both supports work together with the support of the sealing sleeve. On the control housing 140 an air nozzle is provided which is connected to the bellows 130 communicates. At the top of the needle 110 is the waterproof rubber pad 111 intended.

The drain valve 200 includes an upper lid 210 and a lower lid 220 . Between the top lid 210 and the lower lid 220 is an air duct 230 locked in. On the lower lid 220 an air inlet duct is provided which is connected to the air duct 230 and the air supply line 400 connected is. The top lid 210 is with fine needle-like vents 211 Mistake. The air duct 230 is vented through the fine needle-like vents. The air duct 230 is arched, and a sealing ring is around the air duct 230 intended. The top lid 210 and the lower lid 220 work together to clamp the sealing ring. One end of the air intake duct is with the bottom of the air duct 230 connected, and the fine needle-like vents 211 are with the top of the air duct 230 connected.

The outer contours of the top cover 210 and the lower cover 220 are circular. The top lid 210 can be relative to the lower lid 220 rotate. Several fine needle-like vents 211 are arranged at intervals on an arch. By turning the top cover 210 can have one or more fine needle-like ventilation openings 211 with the air duct 230 communicate the delay time of the with the drain valve 200 connected flush valve. In this embodiment, the top lid 210 provided with pin openings, each of the fine needle-like vents 211 correspond. The pin openings are arranged vertically and an air needle is provided in each of the pin openings, the inner channel of which is the fine needle-like vent opening 211 forms. The outside of the air needle is covered with a sealing rubber sleeve which is inserted into the pin opening. The pin opening forms a stepped opening, the lower width of which is greater than the upper width. The outer contour of the rubber seal is graded according to the pin opening. On the lower lid 220 a gear protrusion is provided. At the bottom of the top cover 210 several gang holes are provided. If the passage protrusion is snapped into different passage holes, the number of those with the air duct 230 communicating fine needle-like vents 211 increased or decreased accordingly. The lower lid 220 has a shell-like structure with an opening on the top. The top lid 210 is in the lower lid 220 used. At the opening of the lower cover 220 a stop is provided. Both sides of the top of the top cover 210 are each provided with a boundary bar. If the top lid 210 is turned clockwise until the stop comes into contact with a limiting web, all fine needle-like vents are 211 with the air duct 230 connected. If the top lid 210 is turned counterclockwise until the stop comes into contact with another limiting web, is only a fine needle-like vent 211 with the air duct 230 connected so that's the drain valve 200 connected flush valve has a delay as long as possible. The middle part of the lower lid 220 is provided with a centering pin. The middle part of the top lid 210 is provided with a centering opening, the centering pin being inserted into the centering opening. A decorative cover is also provided. The decorative lid 240 covers a top of the top lid 210 and is locked with the boundary bar.

In the air generator 300 inlet bellows are provided. Alternatively, in the air generator 300 an air pump may be provided. There may be two inlet bellows, one large and one small, each corresponding to a large displacement and a small displacement.

• Die Nadel 110 kann sich linear hin und her nach oben und unten bewegen. In einem normalen Zustand erzeugt die Feder 120 eine elastische Kraft, die die Nadel 110 vorspannt und eine lineare Bewegung der Nadel bewirkt, sodass der Verzögerungsschalter in einen Schließzustand umgeschaltet wird, in dem ein Wasserweg gesperrt wird, wobei ein direkt oder indirekt mit der Nadel 110 verbundener Faltenbalg 130 durch einen Lufterzeuger 300 aufgeblasen werden kann. Bei dem Ausführungsbeispiel ist der Faltenbalg 130 durch das Steuergehäuse 140, den Schiebedeckel 150 und den Halter 160 indirekt mit der Nadel 110 verbunden. Beim Aufblasen des Faltenbalgs 130 nimmt der Faltenbalg die Nadel 110 derart mit, dass sich die Nadel linear in einer umgekehrten Richtung bewegt und der Verzögerungsschalter dadurch in einen Öffnungszustand umgeschaltet wird, in dem der Wasserweg frei ist. Der Faltenbalg 130 ist mit einem Ablassventil 200 verbunden, an dem feine nadelartige Entlüftungsöffnungen für die Entlüftung vorgesehen sind, wobei die Nadel 110 den Wasserweg frei hält, bis die Entlüftung des Ablassventils 200 abgeschlossen ist.

The delay switch works as follows:

• The needle 110 can move up and down linearly. In a normal state, the spring produces 120 an elastic force that the needle 110 preloaded and causes a linear movement of the needle, so that the delay switch is switched to a closed state in which a waterway is blocked, one directly or indirectly with the needle 110 connected bellows 130 by an air generator 300 can be inflated. In the embodiment, the bellows 130 through the control housing 140 , the sliding cover 150 and the holder 160 indirectly with the needle 110 connected. When inflating the bellows 130 the bellows takes the needle 110 such that the needle is linear in moves in a reverse direction and the delay switch is thereby switched to an open state in which the waterway is clear. The bellows 130 is with a drain valve 200 connected, on which fine needle-like ventilation openings are provided for ventilation, the needle 110 keep the waterway clear until the drain valve is vented 200 is completed.

The second embodiment

A second embodiment is described with reference to FIG 7 and 8th described, wherein the second embodiment differs from the first embodiment in that also an air reservoir 500 is available. From the air supply line 400 are first, second and third branches downstream of the check valve 410 branched, the first branch with the bellows 130 , the second branch with the drain valve 200 and the third junction with the air storage 500 connected is.

• Der Faltenbalg 130 ist auch mit dem Luftspeicher 500 verbunden. Der Lufterzeuger 300 liefert Luft gleichzeitig an den Faltenbalg 130 und den Luftspeicher 500. Der Luftauslass des Luftspeichers 300 ist mit der Luftzuführungsleitung 400 verbunden. In der Luftzuführungsleitung 400 ist ein Rückschlagventil 410 vorgesehen. Von der Luftzuführungsleitung 400 sind stromabwärts des Rückschlagventils 410 drei Abzweigungen abgezweigt, die jeweils mit dem Luftspeicher 500, dem Faltenbalg 130 und dem Ablassventil 200 verbunden sind. Der Luftspeicher 500 erhöht die Stabilität des Luftstroms des Verzögerungsschalters.

It works as follows:

• The bellows 130 is also with the air storage 500 connected. The air generator 300 delivers air to the bellows at the same time 130 and the air storage 500 . The air outlet of the air storage 300 is with the air supply line 400 connected. In the air supply line 400 is a check valve 410 intended. From the air supply line 400 are downstream of the check valve 410 three branches branched off, each with the air reservoir 500 , the bellows 130 and the drain valve 200 are connected. The air storage 500 increases the stability of the air flow of the delay switch.

The third embodiment

A third embodiment is described with reference to FIG 9 described, wherein the third embodiment differs from the second embodiment in that a pneumatic 3-way shuttle valve in the second branch 600 is provided, the pneumatic shuttle valve 600 in three interfaces each with the air generator 300 , the drain valve 200 and the check valve 410 are connected. The one with the drain valve 200 connected interface is closed when connected to the air generator 300 connected interface is open. The other way around is the one with the drain valve 200 connected interface opened when connected to the air generator 300 connected interface is closed.

• Wenn durch das pneumatische Wechselventil 600 Luft eingeblasen wird, wird die mit dem Ablassventil 200 verbundene Schnittstelle geschlossen. Die eingeblasene Luft wird während des Einblasvorgangs nicht aus dem Ablassventil 200 ausgelassen, und die Luft tritt vollständig in dem Faltenbalg 130 und den Luftspeicher 500 ein. Nachdem der Einblasvorgang durch das pneumatische Wechselventil 600 beendet ist, wird die mit dem Lufterzeuger 300 verbundene Schnittstelle geschlossen und die Luft in dem Faltenbalg 130 und dem Luftspeicher 500 wird wieder aus dem Ablassventil 200 abgelassen.

It works as follows:

• If through the pneumatic shuttle valve 600 Air is blown in, that with the drain valve 200 connected interface closed. The blown air does not come out of the discharge valve during the blowing process 200 let out, and the air completely enters the bellows 130 and the air storage 500 a. After blowing in through the pneumatic shuttle valve 600 is finished, that with the air generator 300 connected interface closed and the air in the bellows 130 and the air storage 500 will come out of the drain valve again 200 drained.

The pneumatic shuttle valve 600 prevents air from blowing out of the bleed valve 200 escapes. Only after the blowing process has been completed will the discharge valve 200 connected interface opened. In this way, the total air release time from the bellows 130 and the air storage 500 be extended. This increases the water drainage time.

The above features are only preferred embodiments of the present invention and are not intended to limit the scope of the invention. That is, equivalent changes and modifications that are made in accordance with the description and the claims are also to be included in the present invention.

Reference list

100

Control valve

110

needle

111

waterproof rubber pad

120

feather

130

Bellows

140

Timing case

150

Sliding cover

151

Connecting rod

160

holder

200

Drain valve

210

upper lid

211

fine needle-like vent

220

lower lid

230

Air duct

240

decorative lid

300

Air generator

400

Air supply line

410

check valve

500

Air storage

600

pneumatic shuttle valve

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• CN 2033412 U [0003]

Claims (10)

Delay switch with two working states, ie an open state and a closed state, characterized in that the delay switch comprises a control valve, a drain valve, an air generator, a needle, a spring and an air supply line, the control valve having a bellows, an air outlet of the air generator is connected to the air supply line in which a check valve is provided, the air supply line being connected to the bellows downstream of the check valve, and the bellows communicating with the drain valve, and - the needle being carried by the bellows during inflation of the bellows and is thus linearly displaced in a first direction, so that the delay switch is switched to the open state, the needle being displaced linearly in a second direction during emptying of the bellows due to the force of the spring, so that s the delay switch is switched to the closed state. Delay switch after Claim 1 , characterized in that - the control valve has a control housing and a sliding cover, - that one end of the control housing is open and the bellows is arranged in the control housing, - that the sliding cover covers the open end of the control housing and linearly back and forth relative to the control housing can move here, and - that the needle is connected directly or indirectly to the sliding cover and is linearly movable synchronously with the sliding cover. Delay switch after Claim 2 , characterized in that - the sliding cover and the needle are displaced from the bellows during the inflation of the bellows and move along the straight line against the force of the spring in the first direction, and - that the sliding cover and the needle move during the emptying of the bellows move along a straight line in the second direction due to the displacement by the force of the spring. Delay switch after Claim 3 , characterized in that - the control valve further comprises a holder and the lower end of the control housing is open, the holder being arranged on top of the control housing, - that connecting rods are arranged symmetrically on both sides of the sliding cover, which are connected to extension arms, wherein the extension arms are each arranged on the two sides of the holder, - that the holder is connected to the lower end of the needle, and - that the spring is arranged between the holder and the control housing and biases the holder such that the holder extends upwards emotional. Delay switch after Claim 1 , characterized in that - the drain valve comprises an upper cover and a lower cover, between which an air duct is enclosed, an air inlet duct being provided on the lower cover, which is connected to the air duct and the air supply line, - that the upper cover with a plurality of fine needle-like vents through which the air duct is vented, and - that the upper lid is rotatable relative to the lower lid, wherein one or more of the fine needle-like vents can communicate with the air channel due to rotation of the upper lid. Delay switch after Claim 1 , characterized in that - the delay switch further comprises an air reservoir, and - that from the air supply line a first, a second and a third branch are branched downstream of the check valve, the first branch with the bellows, the second branch with the drain valve and the third branch is connected to the air reservoir. Delay switch after Claim 6 , characterized in that - a pneumatic 3-way shuttle valve is arranged in the second branch, the pneumatic shuttle valve being connected in three interfaces to the air generator, the drain valve and the check valve, - the interface connected to the drain valve is closed, if air is blown in by the pneumatic shuttle valve, and - that the interface connected to the air generator is closed after the blowing process by the pneumatic shuttle valve has ended. Functioning of a delay switch, characterized in that - a needle can move back and forth linearly, - that in a normal state a spring generates an elastic force that biases the needle and causes a linear movement of the needle, so that the delay switch in one Closed state is switched in that a water path is blocked, - that a bellows connected directly or indirectly to the needle is inflated by an air generator, - that when the bellows is inflated, the bellows entrains the needle in such a way that the needle moves linearly in a reverse direction and thereby the delay switch is switched to an open state in which the water path is opened, - that the bellows is connected to a drain valve, on which needle-like ventilation openings are provided for ventilation, and - that the needle keeps the water path clear until the Venting of the drain valve is complete. How a delay switch works Claim 8 , characterized in that - the bellows is also connected to an air reservoir, the air generator simultaneously supplying air to the bellows and the air reservoir, - that an air outlet of the air generator is connected to the air supply line, in which a check valve is provided, and - that three branches are branched off from the air supply line downstream of the check valve and are each connected to the air accumulator, the bellows and the drain valve. How a delay switch works Claim 9 , characterized in that - a pneumatic 3-way shuttle valve is provided in the second branch, the pneumatic shuttle valve being connected in three interfaces to the air generator, the drain valve and the check valve, - the interface connected to the drain valve is closed, if air is blown in by the pneumatic shuttle valve, and - that the interface connected to the air generator is closed after the blowing process by the pneumatic shuttle valve has ended.

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