DE102018202414A1 - Water treatment device and dental treatment unit - Google Patents

Abstract

The invention relates to a water treatment device (1) for a dental treatment unit with a mixing container (2), a fluidically coupled to the mixing container (2) water supply (3), at least one with the mixing container (2) fluidly coupled reservoir (4) for receiving at least a water treatment medium and a water outlet (6) fluidically coupled to the mixing vessel (2), wherein the mixing vessel (2) comprises a vessel shell (2.2) and a glass or ceramic vessel within the vessel shell (2.2) and / or a water treatment medium resistant Coating container insert (2.3) for receiving a mixture of water and the water treatment medium and / or the reservoir (4) a container shell (4.2) and within the container shell (4.2) arranged formed of glass or ceramic and / or resistant to the water treatment medium Having coating The invention further relates to a dental treatment unit comprising at least one such water treatment device (1).

Description

The invention relates to a water treatment device for a dental treatment unit.

The invention further relates to a dental treatment unit comprising such a water treatment device.

From the DE 10 2014 012 690 A1 a water treatment device for a dental treatment unit with a pure water outlet is known. The water treatment device comprises a free fall distance for the water over a water supply, which prevents recontamination in an upstream supply system. Furthermore, the water treatment device comprises a piston operated with compressed air piston pump whose inlet is connected to the water supply and whose outlet is connected to an upstream of the pure water outlet arranged ultrafiltration filter to supply the water from the water supply under pressure to the ultrafiltration filter and subsequently the pure water outlet. For example, two push-pull operated piston pressure pumps are provided.

The invention is based on the object to provide a comparison with the prior art improved water treatment device for a dental treatment unit and an improved dental treatment unit.

With regard to the water treatment device, the object is achieved by the features specified in claim 1 and in terms of the dental treatment unit by the features specified in claim 10.

Advantageous embodiments of the invention are the subject of the dependent claims.

Water treatment device for a dental treatment unit comprises a mixing container, a fluidically coupled to the mixing container water supply, at least one fluidically coupled to the mixing container reservoir for receiving at least one water treatment medium and a fluidically coupled to the mixing vessel water discharge. The mixing container comprises a container casing and a container insert formed within the container casing and formed from glass or ceramic and / or having a coating resistant to the water treatment medium for receiving a mixture of water and the water treatment medium. Alternatively or additionally, the storage container comprises a container casing and a container insert, which is arranged inside the container casing and formed from glass or ceramic and / or has a coating resistant to the water treatment medium, for receiving the water treatment medium.

The treatment unit fulfills, for example, the requirements of DIN EN ISO 7494-1 ,

The container insert of the mixing container formed from glass or ceramic and / or having a coating resistant to the water treatment medium and / or the container made of glass or ceramic and / or having a coating resistant to the water treatment medium draw or is characterized on the one hand by a small Contamination tendency and on the other hand by a simple and, for example, carried out at high temperatures cleaning, so that a high purity of the treated water and / or the water treatment medium can be ensured. Furthermore, the container inserts are inexpensive to produce. Further, the container inserts are resistant to the water treatment medium whereas, for example, containers formed of plastic would emit plasticizers to the water and / or water treatment medium and / or become embrittled due to, for example, the water treatment medium.

In a possible development of the water treatment device, the coating of polytetrafluoroethylene (PTFE short) is formed, which is characterized by its high reaction inertia by a particularly high resistance to a variety of substances, such as acids, bases, alcohols, ketones, gasolines and oils. Due to a very low coefficient of friction of PTFE, adhesion of materials to the coating is minimized and cleaning of the coating is greatly simplified.

In one possible embodiment of the water treatment device, this comprises at least one arranged on an outer side of the container shell of the mixing container and / or the reservoir level sensor, wherein a detection element of the at least one level sensor is directed in the direction of the corresponding container insert. Due to the arrangement of the at least one filling level sensor outside the mixing container and / or the storage container, a contact of the mixture contained in the container insert of water and the water treatment medium or the water treatment medium with the sensor is avoided. On the one hand, this results in a protection of the level sensor and on the other hand, a contamination of the mixture of water and the water treatment medium or the water treatment medium avoided with discharged from the level sensor substances. At the same time, the at least one level sensor is characterized by an increased reliability and service life over level sensors used as floats in the prior art. Furthermore, due to the arrangement of the at least one level sensor outside the mixing container and / or reservoir a very simple feasible removal of the container insert from the container shell and an easy-to-carry introduction of the container insert in the container shell with low installation costs possible. Also, the cleaning of the container insert is simplified.

In a further possible embodiment of the water treatment device, the at least one fill level sensor is set up to detect a predetermined minimum fill level or a predetermined maximum fill level of the mixture of water and the water treatment medium or of the water treatment medium. This makes it possible that there is always a sufficient amount of the mixture of water and the water treatment medium or the water treatment medium in the container insert is present.

In a possible development of the water treatment device, the at least one filling level sensor is designed as a capacitive sensor. Such capacitive sensors allow non-contact detection with high accuracy, reliability and life and low cost.

According to a possible embodiment of the water treatment device, the at least one level sensor is located directly against the container casing and the container casing directly against the container insert. As a result, no air gap between the at least one level sensor and the container insert is present and a risk of falsification of measurement results is effectively reduced.

According to a further possible embodiment of the water treatment device, the container casing comprises on an inner side at least one holding structure for fixing the position of the container insert in the container casing. In this way, a secure hold of the container insert in the container shell can be ensured in a predetermined position, so that a reliable level determination is always possible.

According to a possible development of the water treatment device, the container shell is made of plastic. This favors the use of contactless level determination with simultaneous simple and cost-effective production.

A possible embodiment of the water treatment device provides that a first level sensor for detecting a predetermined minimum level of the mixture of water and the water treatment medium is formed and a second level sensor for detecting a predetermined maximum level of the mixture of water and the water treatment medium is formed. The level sensors are coupled to a control unit which automatically opens the water supply into the mixing container and a water treatment medium supply into the mixing container when the minimum level is undershot. Upon reaching the maximum level, the control unit automatically closes the water supply into the mixing tank and the water treatment medium supply into the mixing tank. This allows a simple, reliable and comfortable level monitoring and ensures that there is always a sufficient amount of the mixture in the container insert.

According to a possible further development of the water treatment device, a fill level sensor coupled to a control unit is provided for detecting a fill level of the storage container, wherein the fill level sensor transmits a signal to the control unit when it falls below a predetermined minimum fill level of the water treatment medium. The control unit controls when falling below the minimum level, for example, an output unit which outputs an optical, acoustic and / or haptic signal, so that a user can fill the reservoir with the water treatment medium. Thus, it can be ensured in a simple manner that there is always a sufficient amount of the water treatment medium in the container insert.

Another possible embodiment of the water treatment device provides at least one with the at least one reservoir and the mixing container fluidly coupled metering pump for transporting the water treatment medium located in the reservoir into the mixing container. The dosing pump allows in a simple, reliable and very accurate way, the supply of a predetermined amount of the water treatment medium, in particular a water treatment fluid in the mixing vessel. The water treatment fluid is intended, for example, to produce treated water designated as process water according to AWMF Register No. 075-002 class S2k, such as pure water, ultrapure water or disinfected water. For example, the water treatment fluid is hydrogen peroxide or chlorine dioxide.

One possible embodiment of the water treatment device provides that the mixing container comprises at least one overflow. The overflow is designed in particular according to DIN EN 13077 and ensures that a controlled overflow of a maximum fill level in the mixing container is possible.

A possible further embodiment of the water treatment device provides that the mixing container comprises at least one overflow sensor, the overflow sensor is coupled to a arranged in the water supply emergency valve and upon detection of a predetermined maximum level in the mixing container the emergency valve such controls that it closes. As a result, the exceeding of the maximum level and a resulting overflow can be avoided, thereby avoiding contamination of an environment of the water treatment device and protection of the environment can be realized from damage.

The dental treatment unit according to the invention comprises at least one water treatment device described above. The water treatment device allows removal of treated water from the high purity mixing vessel during a dental treatment. At the same time, operation of the dental treatment unit is greatly simplified due to the simple cleaning of the container insert.

Embodiments of the invention are explained in more detail below with reference to drawings.

• 1 schematisch eine perspektivische Ansicht einer Wasseraufbereitungsvorrichtung für eine dentale Behandlungseinheit,
• 2 schematisch eine Draufsicht der Wasseraufbereitungsvorrichtung gemäß 1,
• 3 schematisch eine Schnittdarstellung eines Mischbehälters der Wasseraufbereitungsvorrichtung gemäß 1 mit einer Füllstandssensoranordnung,
• 4 schematisch eine Schnittdarstellung eines Vorratsbehälters der Wasseraufbereitungsvorrichtung gemäß 1 mit einem Füllstandssensor,
• 5 schematisch eine Schnittdarstellung eines Pumpsystems der Wasseraufbereitungsvorrichtung gemäß 1 und
• 6 schematisch einen Schaltplan der Wasseraufbereitungsvorrichtung gemäß 1.

Show:

• 1 schematically a perspective view of a water treatment device for a dental treatment unit,
• 2 schematically a plan view of the water treatment device according to 1 .
• 3 schematically a sectional view of a mixing container of the water treatment device according to 1 with a level sensor arrangement,
• 4 schematically a sectional view of a reservoir of the water treatment device according to 1 with a level sensor,
• 5 schematically a sectional view of a pumping system of the water treatment device according to 1 and
• 6 schematically a circuit diagram of the water treatment device according to 1 ,

Corresponding parts are provided in all figures with the same reference numerals.

In 1 is a perspective view of a water treatment device 1 shown for a dental treatment unit, not shown. 2 shows a plan view of the water treatment device according to 1 ,

The water treatment device 1 is set up to prepare water for use in various functions of the dental treatment unit, in particular treatment tools and / or a water tap, that, for example, according to AWMF Register No. 075-002 class S2k referred to as process water treated water, especially purified water, disinfected water or so-called pure water or so-called ultrapure water for which functions are available.

To produce the treated water includes the water treatment device 1 a mixing container 2 with a lid 2.1 , one with the mixing container 2 fluidically coupled water supply 3 and one with the mixing container 2 fluidically coupled reservoir 4 with a lid 4.1 for receiving at least one water treatment medium, such as hydrogen peroxide or chlorine dioxide.

The mixing container 2 includes, as in 3 shown in more detail, a container shell 2.2 and one within the container shell 2.2 arranged, formed of glass or ceramic and / or a resistant to the water treatment medium coating container insert 2.3 for receiving the mixture of water and the water treatment medium.

Also the reservoir 4 includes, as in 4 shown in more detail, a container shell 4.2 and one within the container shell 4.2 arranged container made of glass or ceramic and / or having a resistant to the water treatment medium coating container insert 4.3 for receiving the water treatment medium.

The water supply 3 comprises a valve unit 7 , by means of which the supply of water into the mixing container 2 is controlled.

Furthermore, the reservoir 4 and the mixing container 2 in a water treatment medium supply fluidly with a metering pump 5 for transporting one in the storage container 4 located water treatment medium in the mixing vessel 2 coupled. By means of the dosing pump 5 there is an exact supply of a predetermined amount of the water treatment medium in the mixing tank 2 , so that inside the mixing container 2 the treated water is present. In this case, the adjustment of the amount of the supplied water treatment medium in response to a means of water supply 3 the mixing container 2 supplied amount of water.

Both the valve unit 7 as well as the metering pump 5 be by means of a control unit 8th controlled, which is part of the water treatment device 1 is.

To detect a level of the reservoir 4 this includes one with the control unit 8th coupled, in particular designed as a capacitive sensor, level sensor 9 , wherein the level sensor 9 falls below a predetermined minimum level of the water treatment medium, a signal to the control unit 8th transfers. The control unit 8th If the minimum filling level is undershot, it activates an output unit which emits an optical, acoustic and / or haptic signal, so that a user can fill the storage container with the water treatment medium.

For detecting a level of the mixing container 2 this one includes the control unit 8th coupled level sensor arrangement 10 , which a, in particular designed as a capacitive sensor, lower first level sensor 10.1 and a, in particular designed as a capacitive sensor, upper second level sensor 10.2 includes. By means of signals of the level sensor arrangement 10 recognizes the control unit 8th whether inside the mixing container 2 treated water is located.

In this case, the lower first level sensor generates 10.1 a signal and transmits this to the control unit 8th when a predetermined minimum level of the treatment water within the mixing tank 2 is reached or fallen below. If so, the control unit controls 8th the valve unit 7 and the dosing pump 5 such that water and water treatment medium in a predetermined ratio in the mixing vessel 2 be filled.

When this filling the water and water treatment medium is a predetermined maximum level within the mixing vessel 2 reached, generates the upper second level sensor 10.2 a signal and transmits this to the control unit 8th , If so, the control unit controls 8th the valve unit 7 and the dosing pump 5 such that the supply of water and water treatment medium is stopped.

In case of malfunction of the upper second level sensor 10.2 an overflow of the mixing container 2 to avoid is on the lid of the mixing container 2 one with the control unit 8th coupled overflow sensor 11 arranged. When filling the water and water treatment medium a predetermined additional maximum level within the mixing container 2 reached, the overflow sensor generates 11 a signal and transmits this to the control unit 8th , If so, the control unit controls 8th the valve unit 7 and the dosing pump 5 such that the supply of water and water treatment medium is stopped.

In this case, the valve unit comprises 7 a first valve 7.1 feeding the water into the mixing container 2 releases or locks. Furthermore, the valve unit comprises 7 one with the first valve 7.1 fluidly connected in series emergency valve 7.2 , which in the normal operation of the water treatment device 1 always open.

Detects the overflow sensor 11 the exceeding of the further maximum level within the mixing container 2 although already the upper second level sensor 10.2 a signal to the control unit 8th to close the valve 7.1 has transmitted detects the control unit 8th a defect of the valve 7.1 and controls the emergency valve 7.2 such that it closes and thus the supply of water in the mixing container 2 locks.

With these mechanisms can overflow the mixing tank 2 safely avoided.

For a continuous pumping of the treated water from the mixing tank 2 in particular without interruption, and for supplying the treated water to various components or tools of the dental treatment unit comprises the water treatment device 1 in a possible embodiment with a water drainage 6 of the mixing container 2 fluidically coupled pumping system 12 for removing treated water from the mixing tank 2 ,

On top of the pumping system 12 is a valve assembly 13 with two valve units 13.1 . 13.2 and a control unit, not shown, for controlling the valve unit 13.1 . 13.2 arranged.

In 3 is a sectional view of the mixing container 2 the water treatment device 1 according to the 1 and 2 with the level sensor arrangement 10 shown.

The mixing container 2 comprises a container shell formed in particular from plastic 2.2 and one within the container shell 2.2 arranged formed of glass or ceramic and / or a against the water treatment medium resistant coating having container insert 2.3 for receiving the mixture of water and the water treatment medium.

The level sensor arrangement 10 includes the first level sensor 10.1 and the second level sensor 10.2 , where both level sensors 10.1 . 10.2 are each formed as a capacitive sensor. Detection elements of the level sensors 10.1 . 10.2 are in the direction of the container use 2.3 directed. Both level sensors are located 10.1 . 10.2 directly on the container shell 2.2 and the container shell 2.2 at least in the area of level sensors 10.1 . 10.2 directly on the container insert 2.3 on. As a result, there is no air gap between the level sensors 10.1 . 10.2 and the container insert 2.3 and a risk of falsification of measurement results is effectively reduced.

Furthermore, the container shell 2.2 on a inside a holding structure 27 on, which in the illustrated embodiment, two holding elements 27.1 and 27.2 to a positional fixation of the container insert 2.3 in the container shell 2.2 includes. For example, the holding structure 27 as a common molding with the container shell 2.2 educated. The holding elements 27.1 and 27.2 are for example at a distance of 120 ° in the container shell 2.2 arranged and form two points of a three-point bearing of the container insert 2.3 , A third point is in the area of the arrangement of the level sensors 10.1 . 10.2 is formed and is through the container shell 2.2 self-formed, with the container use 2.3 at this third point directly on the container shell 2.2 is applied and thus the air gap-free arrangement of the level sensors 10.1 . 10.2 allows.

4 shows a sectional view of the reservoir 4 the water treatment device 1 according to the 1 and 2 with the level sensor 9 ,

The storage tank 4 comprises a container shell formed in particular from plastic 4.2 and one within the container shell 4.2 arranged container made of glass or ceramic and / or having a resistant to the water treatment medium coating container insert 4.3 for receiving the water treatment medium.

The level sensor 9 is designed as a capacitive sensor, wherein detection elements of the level sensor 9 in the direction of the container insert 4.3 are directed. This is the level sensor 9 directly on the container shell 4.2 and the container shell 4.2 at least in the area of the level sensor 9 directly on the container insert 4.3 on. As a result, there is no air gap between the level sensor 9 and the container insert 4.3 and a risk of falsification of measurement results is effectively reduced.

Furthermore, the container shell 4.2 on a inside a holding structure 28 on, which in the illustrated embodiment, two holding elements 28.1 and 28.2 to a positional fixation of the container insert 4.3 in the container shell 4.2 includes. For example, the holding structure 28 as a common molding with the container shell 4.2 educated. The holding elements 28.1 and 28.2 are for example at a distance of 120 ° in the container shell 4.2 arranged and form two points of a three-point bearing of the container insert 4.3 , A third point is in the area of the arrangement of the level sensor 9 is formed and is through the container shell 4.2 self-formed, with the container use 4.3 at this third point directly on the container shell 4.2 is applied and thus the air gap-free arrangement of the level sensor 9 allows.

In 5 is a sectional view of the example designed as Doppelhubkolbenpumpsystem pumping system 12 the water treatment device 1 according to the 1 and 2 shown.

6 schematically shows a circuit diagram of the water treatment device 1 according to 1 ,

The wiring diagram shows that in a suction line 24 a valve designed as a check valve 22 is arranged, which is open when the metering pump 5 the water treatment medium from the reservoir 4 sucks. At the same time, one is in one with the suction line 24 fluidically coupled supply line 25 arranged further formed as a check valve valve 23 closed. If by means of the metering pump 5 the water treatment medium into the mixing tank 2 is promoted, however, is the valve 22 closed and the valve 23 it is open.

The pumping system 12 includes a first cavity 12.1 for receiving a working medium, for example air, fluidly from the first cavity 12.1 separate second cavity 12.2 for receiving the treated water and a double piston 12.3 with a piston rod 12.3.1 and two at opposite ends of the piston rod 12.3.1 arranged pistons 12.3.2 . 12.3.3 where a first piston 12.3.2 movable in the first cavity 12.1 and a second piston 12.3.3 movable in the second cavity 12.2 is arranged.

According to a possible development of the water treatment device 1 are the two cavities 12.1 . 12.2 delimiting walls and twin pistons 12.3 of the pumping system 12 Made of food safe plastic. This ensures that no substances are released from the plastic, which affect a chemical and / or sensory quality of the treated water.

Continuous production of the treated water includes the first cavity 12.1 on at least two opposite sides in each case at least one working medium inlet E1 . E2 , wherein in the working medium inlets E1 . E2 one inlet valve each 14 . 15 is arranged. The intake valves 14 . 15 are part of the valve unit 13.1 and in particular electronically controllable valves. The valve unit 13.1 comprises a further, in particular designed as electronically controllable valve, valve 21 for supplying the dosing pump 5 with the working medium.

The working media inlets E1 . E2 are with a working medium source 26 , For example, a compressed air source coupled, wherein upon application of a first working medium inlet E1 with the working fluid in the second working fluid inlet E2 arranged second inlet valve 15 closed and the first piston 12.3.2 a movement in a first direction R1 performs. Upon admission of a second working medium inlet E2 with the working medium is one in the first working medium inlet E1 arranged first inlet valve 14 closed and the first piston 12.3.2 performs a movement in one of the first direction R1 opposite second direction R2 out.

The second cavity 12.2 includes at least one inlet on each of two opposite sides E3 . E4 for treated water. The inlets E3 . E4 are with the mixing container 2 coupled. Furthermore, in the inlets E3 . E4 in each case one, for example, designed as a check valve inlet valve 16 . 17 arranged, with the intake valves 16 . 17 Part of the valve unit 13.2 are.

Furthermore, the second cavity comprises 12.2 each at least one outlet on the two opposite sides A1 . A2 for treated water, wherein in the illustrated embodiment, the outlet A1 the inlet E3 corresponds and the outlet A2 the inlet E4 equivalent. The outlets A1 . A2 are there with an exit 18 coupled with which in turn at least one treatment tool and / or a water tapping point is coupled or is. In the outlets A1 . A2 is in each case one designed for example as a check valve outlet valve 19 . 20 arranged, with the exhaust valves 19 . 20 also part of the valve unit 13.2 are.

At one of the movement of the first piston 12.3.2 resulting movement of the second piston 12.3.3 in the first direction R1 is the first inlet valve 16 of the second cavity 12.2 in the movement in the first direction R1 facing away from the first inlet E3 open. At the same time, the second inlet valve 17 of the second cavity 12.2 in one of the movement in the first direction R1 facing the second inlet E4 closed. The first exhaust valve 19 of the second cavity 12.2 in one of the movement in the first direction R1 facing away from the first outlet A1 is closed and the second exhaust valve 20 of the second cavity 12.2 in the movement in the first direction R1 facing the second outlet A2 it is open. Thus, by means of the double piston pump system 12 through the first inlet E3 treated water in the second cavity 12.2 sucked and simultaneously with an opposite side of the piston 12.3.3 treated water through the second outlet A2 to the exit 18 promoted.

At one of the movement of the first piston 12.3.2 resulting movement of the second piston 12.3.3 in the second direction R2 is the first inlet valve 16 of the second cavity 12.2 in the movement in the second direction R2 facing first inlet E3 closed. At the same time, the second inlet valve 17 of the second cavity 12.2 in the movement in the second direction R2 remote second inlet E4 open. The first exhaust valve 19 of the second cavity 12.2 is in the movement in the second direction R2 facing first outlet A1 opened and the second exhaust valve 20 of the second cavity 12.2 is the movement in the second direction R2 remote second outlet A2 closed. Thus, by means of the double piston pump system 12 through the second inlet E4 treated water in the second cavity 12.2 sucked and simultaneously with an opposite side of the piston 12.3.3 treated water through the first outlet A1 to the exit 18 promoted.

LIST OF REFERENCE NUMBERS

1

Water treatment device

2

mixing tank

2.1

cover

2.2

container shell

2.3

container insert

3

water supply

4

reservoir

4.1

cover

4.2

container shell

4.3

container insert

5

metering

6

drainage

7

valve unit

7.1

Valve

7.2

Notausventil

8th

control unit

9

level sensor

10

Level sensor assembly

10.1

first level sensor

10.2

second level sensor

11

Overflow sensor

12

pumping system

12.1

first cavity

12.2

second cavity

12.3

double piston

12.3.1

piston rod

12.3.2

piston

12.3.3

piston

13

valve assembly

13.1

valve unit

13.2

valve unit

14 to 17

intake valve

18

exit

19

outlet valve

20

outlet valve

21 to 23

Valve

24

suction

25

feed

26

Working medium source

27

holding structure

27.1 to 27.2

retaining element

28

holding structure

28.1 to 28.2

retaining element

A1

outlet

A2

outlet

E1

Working fluid inlet

E2

Working fluid inlet

E3

inlet

E4

inlet

R1

direction

R2

direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely 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.

Cited patent literature

• DE 102014012690 A1 [0003]

Cited non-patent literature

• DIN EN ISO 7494-1 [0008]

Claims (10)

Water treatment device (1) for a dental treatment unit with a mixing container (2), a water supply (3) fluidly coupled to the mixing container (2), - At least one with the mixing container (2) fluidly coupled reservoir (4) for receiving at least one water treatment medium and - One with the mixing vessel (2) fluidly coupled water outlet (6), wherein - The mixing container (2) a container shell (2.2) and within the container shell (2.2) arranged formed of glass or ceramic and / or a resistant to the water treatment medium coating container insert (2.3) for receiving a mixture of water and the water treatment medium and / or - The reservoir (4) comprises a container shell (4.2) and within the container shell (4.2) arranged formed of glass or ceramic and / or a resistant to the water treatment medium containing container insert (4.3) for receiving the water treatment medium or comprises. Water treatment device (1) after Claim 1 , comprising - at least one level sensor (9, 10.1, 10.2) arranged on an outer side of the container casing (2.2, 4.2), - wherein a detection element of the at least one filling level sensor (9, 10.1, 10.2) directed in the direction of the container insert (2.3, 4.3) is. Water treatment device (1) after Claim 2 wherein the at least one level sensor (9, 10.1, 10.2) is adapted to detect a predetermined minimum level or a predetermined maximum level of the mixture of water and the water treatment medium or the water treatment medium. Water treatment device (1) after Claim 2 or 3 , wherein the at least one level sensor (9, 10.1, 10.2) is designed as a capacitive sensor. Water treatment device (1) according to one of Claims 2 to 4 , wherein the at least one filling level sensor (9, 10.1, 10.2) bears directly against the container casing (2.2, 4.2) and the container casing (2.2, 4.2) bears directly against the container insert (2.3, 4.3). Water treatment device (1) according to one of the preceding claims, wherein the container casing (2.2, 4.2) on an inner side at least one holding structure (27, 28) for fixing the position of the container insert (2.3, 4.3) in the container casing (2.2, 4.2). Water treatment device (1) according to one of the preceding claims, wherein the container casing (2.2, 4.2) is formed from plastic. Water treatment device (1) according to one of Claims 2 to 7 in which - a first level sensor (10.1) for detecting a predetermined minimum level of the mixture of water and the water treatment medium is formed and a second level sensor (10.2) for detecting a predetermined maximum level of the mixture of water and the water treatment medium is formed, - Fill level sensors (10.1, 10.2) are coupled to a control unit (8), - the control unit (8) automatically opens the water feed (3) into the mixing tank (2) and a water treatment medium feed into the mixing tank (2) when the minimum level is undershot, and the control unit (8) when reaching the maximum level automatically closes the water supply (3) in the mixing container (2) and the water treatment medium supply into the mixing container (2). Water treatment device (1) according to one of the preceding claims, comprising at least one metering pump (5) fluidically coupled to the at least one storage container (4) and the mixing container (2) for transporting the water treatment medium located in the storage container (4) into the mixing container (2). , Dental treatment unit comprising at least one water treatment device (1) according to one of the preceding claims.

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