DE20217721U1 - Air extraction device for toilet basin has fan arranged in cistern which sucks away air through flushing water fall pipe under water distribution edge of toilet basin - Google Patents

Abstract

The air extraction device for a toilet basin (1,3) has a fan (7) arranged in the cistern (5a) which sucks away air through the flushing water fall pipe (3a) under the water distribution edge (3b) of the toilet basin. Flushing water is fed from the cistern by operation of the water lock (2) by raising the valve pipe (5). It is fed away from the basin as dirty water via the outflow pipe (15). The fan or tube blower (7) arrangedin cistern has a flexible hose (6) fitted to its input side and the other hose end is freely movable in its extension into the valve pipe of the water lock (2). A function of the lever mechanism of the water lock is ensured by operation of the flushing process. The tube blower is continuously operated at a low speed on a standing basis and when a person approaches the toilet to use it, a sensor via a mains part changes the blower to a higher operative speed. As soon as the person has departed the blower reverts to its low speed.

Description

Air extraction device for toilet bowls

The invention relates to an air extraction device for toilet bowls with a fan arranged in the cistern. 5

Air extraction devices for extracting the foul gases from toilet bowls are known in which an electrically operated fan is arranged in the cistern and the air is extracted from under the water distribution rim of the toilet bowl through the flush water downpipe and the cistern and discharged into the sewage pipe or into the exhaust air pipe above the roof.

However, these known air extraction devices have significant disadvantages, as they require the use of airtight cisterns, check valves, check caps, etc. to prevent the fermentation gases from flowing back.

Such air extraction devices consist of complex structures with numerous components and are subject to heavy wear. They are uneconomical to manufacture, can rarely be retrofitted to existing toilet facilities and are extremely prone to repairs.

The invention therefore has the object of providing an air extraction device for toilet bowls which can be used for all standardized toilet bowls and cisterns, consists of few components and is suitable for subsequent installation in existing toilet facilities.

According to the invention, the object is achieved in that in air extraction devices for toilet bowls with a fan arranged in the cistern, in which the air is extracted from under the water distribution edge of the toilet bowl through the flush water downpipe and discharged into the sewage pipe or the exhaust pipe above the roof, a flexible hose is attached to the inlet side of the fan arranged in the cistern, the other end of which projects freely into the valve pipe of the water lock. According to the invention, the fan is constantly operated at a low speed and thus creates a negative pressure in the toilet bowl as an odor trap, so that any other components for preventing the backflow of foul gases can be omitted.

A sensor is located in the immediate vicinity of the toilet bowl, which, by means of a control unit, switches the fan to a higher speed when a person approaches the toilet bowl, thus sucking out the foul gases.

Conveniently, the fan consists of a miniature ball-bearing fan to ensure a long service life and low running noise.

To enable easy installation, it is arranged in a plastic housing to which the supply and drainage lines are attached using standardized fastening devices and siphon fittings.

To prevent insects from entering the exhaust air system, a mesh grille is installed in front of the exhaust air system on the water inlet pipe.

The air extraction device according to the invention ensures the use of fewer components, is economical to manufacture, requires minimal power consumption and is not susceptible to repair.

Existing toilet facilities can be retrofitted with the air extraction system according to the invention.

The invention is described below by way of example with reference to the drawings:

Figure 1 shows an embodiment of a toilet system according to the invention.
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Figure 2 shows an embodiment of the cistern system according to the invention.

Figure 3 shows the block diagram for controlling the air extraction device.

The toilet facility consists of the toilet bowl 1 with toilet bowl 3 with flush water inlet 3 a, water distribution rim 3 b, odour trap 3 c and waste water drain 3 d.

The flushing water is fed from the cistern 5 a to the toilet bowl 3 through the water inlet pipe 4 when the flushing device (not shown in detail) is actuated by opening the water lock 2 by lifting its valve pipe 5 and is drained off as dirty water via the drain pipe 15.

The air extraction device according to the invention consists of

a pipe blower 7 arranged in the cistern 5a, on the inlet side of which a flexible hose 6 is arranged, the other end of which projects freely into the valve pipe 5 of the water lock 2 to such an extent that a function of the lever mechanism of the water lock 2 is ensured when the flush is actuated.

On the outlet side of the pipe blower 7, exhaust pipes are arranged, a blow-out hose 14 which leads out laterally from the cistern 5a and is connected to a siphon pipe which opens into the drain pipe 15 and thus discharges the digestion gases.

According to the invention, the tube blower 7 is continuously operated at a low speed as a stationary mode and, when a person approaches to use the toilet, is switched to a higher speed in the operating mode by a sensor via a power supply unit with control and, as soon as the person has moved away again, is switched back to the stationary mode.

The pipe blower 7, which is constantly operated at low speed in idle mode, generates a constant negative pressure as an air curtain in the toilet bowl 3 via the flexible hose 6, the blow-out hose 14 and the siphon pipe 8, so that no other technical components are required as an odor trap, such as check valves, check caps, backflow chambers, holding valves and the like.

The blower motor of the fan 9 is conveniently equipped as a long-running motor with ball bearings and is inaudible to the human ear when idling and has a

exceptionally low power consumption.

During operation, the speed is increased many times over, for example by applying a higher operating voltage, in order to suck the foul gases out of the toilet bowl 3 and discharge them into the drain pipe 15 via the flush water inlet 3 a, water inlet pipe 4, valve pipe 5, flexible hose 6, pipe blower 7, drain hose 14 and siphon pipe 8.

The extracted digestion gases can also be discharged via an exhaust pipe above the roof.

For the application of the invention, it has proven expedient to arrange a mesh grid 18 under the water lock 2 above the upper end of the water inlet pipe 4 in order to prevent insects from entering the exhaust air system.

The fan 9 can, for example, be designed as a miniature fan that is inserted into a square or round plastic housing 10. The siphon screw connections 12 are attached on both sides by four split pins 11.

On the blow-out side, the siphon screw connection 12 is provided with a seal 13. The screw connection enables quick and easy installation of the pipe blower between the flexible hose 6 and the blow-out hose 14 and both are mounted on the pipe blower 7 by means of the siphon screw connection 12.
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According to Figure 3, the power supply unit 17 is controlled by a sensor. Integrated circuits are used to minimize the assembly.

List of reference symbols

I. Toilet bowl 2 . Water lock

3 . Toilet bowl

3 a Flushing water inlet 3 b Water distribution edge 3 c Odour trap 10 3d Waste water outlet

4 . Water inlet pipe

5 . Valve tube

5 a Cistern 6. Flexible hose 7. Pipe blower

8. Siphon pipe

9. Fan

10. Plastic housing

II. Split pins

12 . Siphon screw connection

13. Rubber seal

14. Blow-out hose

15. Drain pipe

16. Motion detector 17. Power supply

18. Mesh grid

Claims (4)

1. Air extraction device for toilet bowls with a fan arranged in the cistern, in which the air from under the water distribution edge of the toilet bowl is sucked out through the flush water downpipe and led into the drain pipe or exhaust air pipe, characterized in that a flexible hose is attached to the inlet side of the fan, the other end of which projects freely into the valve pipe of the water lock, the fan constantly creates a negative pressure in the toilet bowl at a low speed as an odor trap, in the immediate vicinity of the toilet bowl a sensor connected to a control device for the fan is arranged, by means of which the fan is switched to a higher speed when a person approaches the toilet bowl. 2. Air extraction device for toilet bowls according to claim 1, characterized in that the tube blower has a miniature fan which is inserted into a round or square plastic housing and to which the siphon screw connections of the siphon pipes are attached by means of split pins. 3. Air extraction device for toilet bowls according to claim 1 and 2, characterized in that a seal is arranged between the plastic housing and the blow-out hose on the outlet side of the siphon screw connection. 4. Air extraction device for toilet bowls according to claim 1 and 2, characterized in that a mesh grid is arranged under the water lock at the upper end of the water inlet pipe.