DE202016003012U1 - Device for detecting a discrete filling level in a storage container for liquids, in particular in a pressurized water container of a system for self-water supply - Google Patents

Abstract

Device for detecting a discrete filling level in a storage container for liquids, in particular in a pressurized water container of a system for self-water supply, with a storage container (500) against a pressure of an air cushion (38) between a minimum level (LL) and a maximum level (HL ) stores the supplied via a supply line (20) liquid (W2) and emits them if necessary in a supply line (24), with a on a container shell (13) of the storage container (500) between a lower connection for water level gauge (5a) and a Upper level for water level gauge (5b) arranged water level indicator (32) consisting of a lower connection (5a) arranged lower water level fitting (32.1) and in the upper port (5b) upper water level fitting (32.2) with an interposed indicator tube (32.3) exists, over which the level (L) is shown, characterized characterized in that on the indicator tube (32.3) from the outside a lower sensor (32.5) for detecting the minimum level (LL) and optionally an upper sensor (32.6) for detecting the maximum level (HL) are arranged, 32.5, 32.6) are connected to a control unit (400), and • that the sensors (32.5, 32.6) are capable of detecting physical changes in the indicator tube (32.3) if at the respective location of the sensor (32.5, 32.6) Liquid (W2) is present or absent in the indicator tube (32.3).

Description

TECHNICAL AREA

The innovation relates to a device for detecting a discrete filling level in a storage container for liquids, in particular in a pressurized water tank of a system for self-water supply, with a storage container that stores against a pressure of an air cushion between a minimum level and a maximum level, the liquid supplied via a supply line and dispenses this if necessary in a supply line, with a arranged on a container shell of the storage container between a lower connection for water level meter and a top port for water level meter water level indicator consisting of a lower terminal arranged in the lower water level fitting and arranged in the upper terminal upper water level fitting with a arranged therebetween first indicator tube over which the level is shown. The innovation is transferable to any storage container on which is displayed with a water level indicator of the type in question or a display tube, the level in the storage tank or transmitted measurable.

STATE OF THE ART

In systems for self-water supply, which are not connected to the public water network, storage container of the type mentioned are arranged. These storage tanks are usually commercial water heaters, the suitability of a pressurized water tank after DIN 4810 have. They are available with contents in increments of 150 to 10,000 liters. In addition to connections for the aforementioned water level indicator for visual indication of the level in the container from the outside the latter have on their container shell via two vertically spaced connections in the form of sleeves, are arranged on the so-called. Folding float switch or diaphragm pressure switch inside the storage container and via a discrete minimum level and a discrete maximum level detected respectively and fed the corresponding signals to a control unit and there to switching tasks in the context of self-water supply, such as re-loading of the storage container on reaching the minimum level, backwashing the gravel filter system and / or air cushion correction used , The latter connections correspond in terms of their altitude on the container shell substantially with those for the arrangement of the water level indicator.

At the vorg. Arrangement of the hinged float switch or the diaphragm pressure switch is disadvantageous in that on the one hand, the altitude or installation position of the switch without a significant displacement clearance up or down by the associated connections is fixed and can not be changed, and that on the other hand, the assembly or Disassembly and / or maintenance of these switches is only possible by intervention and shutdown in the pressurized system for self-water supply.

It is an object of the innovation to overcome the disadvantages of the aforementioned prior art by a simpler, thereby independent of fixed installation positions of the means for detecting discrete levels and thereby more cost-effective solution.

SUMMARY OF THE INVENTION

This object is achieved by a device having the features of claim 1. Advantageous embodiments of the inventive device are the subject of the dependent claims.

The principle according to the invention consists in that a lower sensor for detecting the minimum fill level and optionally an upper sensor for detecting the maximum fill level are arranged on the display tube of the water level indicator from the outside. The sensors are connected to a control unit of the system, and the respective sensor has the ability to detect physical changes in the display tube, if at the respective location of the sensor, the liquid in the display tube is present or not present.

For a non-contact water level detection is created, which manages without intervention in the storage container. Maintenance and adjustment work on the sensors can thus be carried out without switching off the pressurized water system.

The basic solution provides in a very simple manner the possibility of vertically displaceable positioning of the sensors, as provided by an advantageous embodiment, and thus of shifting a discrete filling level, with which a switching signal is generated, within wide limits. This makes it possible for the first time to set a leveling point or a switching point which is flexible and independent of fixed connection or sleeve positions on the storage container.

The innovation suggests that in particular a capacitive or an inductive or a with changes in electrical conductivity or with a Ultrasonic signals working sensor is used. It has proven to be particularly advantageous to use commercial capacitive sensors, as they are inexpensive and easy to connect.

Another embodiment of the device according to the invention makes it possible for the first time to control the maximum filling level and to make it visible in a region above the upper connection for water level gauges, ie. H. shift above the upper water level fitting. This is achieved in an unexpectedly simple manner in that the display tube is extended fluidly beyond the upper water level fitting in a display tube extension, and that the upper sensor is displaced into an arrangement position at the display tube extension. This makes it possible to utilize the available storage volume for backwashing the filter container (eg gravel filter container) by realizing a flexible switching point. By the vorg. Extension of the water level indicator is also an optimal detection and adjustment of the air mailer volume, which is located above the maximum level in the headspace of the storage tank given. This embodiment, in itself, constitutes a separate object of the invention.

At a level up to the upper water level fitting prevails generally due to the present pressure equalization above the respective liquid level of the same air cushion pressure in the storage tank and in the display tube. According to the principle of communicating tubes, therefore, the level in the storage container is formed adequately, d. H. 1: 1 in the indicator tube.

If, in the latter embodiment, the level is displaced into the area above the upper water level fitting in order to utilize this area in the manner described above, then this pressure equalization above the liquid level is no longer possible. It will take place in the display tube extension then no adequate mapping of the level present in the container more if the relationship between initial volume of the air cushion and final volume after completion of the level change on the one hand in the storage tank and on the other hand in the display tube extension are not the same by the level change in the storage tank , But this is always the case when, as is usually the indicator tube extension does not extend to the head of the storage container. Another deviation results from the fact that due to the curved shape of the upper floor, the air cushion volume can not be realized as an exact cylindrical volume, as is the case in the display tube extension.

However, there is a stringent relationship between the present level in the storage tank above the upper water level fitting and the level indicated in the display pipe extension, on the one hand by the relevant physical laws (pressure balance of static and hydrostatic pressure, general gas law) and on the other hand by the present Geometriebedingungen ( Air cushion volumes in the storage tank and in the display tube extension respectively above the upper water level fitting) is determined. If this relationship is determined mathematically and / or experimentally, it is possible to infer the level present in the storage container from the indicated fill level recorded via the upper sensor at the indicator tube extension.

An approximate calculation in which an actual level difference in the storage tank with h1 and a displayed level difference in the display pipe extension with h2, both above the upper and relative to the upper water level fitting, and a first height of the air cushion volume in the storage tank with H1 and a second height the air cushion volume in the display tube extension with H2, both also above the upper and relative to the upper water level fitting, are designated (see 3 ) and neglecting the hydrostatic pressures h1ρg and h2ρg (with density ρ and gravitational acceleration g) in the pressure balance relative to the static pressure in the associated air cushion, provides the following relationship between the displayed with the upper sensor displayed level difference h2 and the actual level difference h1 (equation (1)): h2 ≈ h1 H2 / H1 (1)

If, as is also proposed, the upper end of the indicator tube extension is fluidly connected to the headspace of the storage container via a conduit, then the pressure equalization between head space of the storage container and head space of the indicator tube extension is the principle of the communicating tubes also realized above the upper water level fitting and the level in the reservoir is formed adequately in the indicator tube extension from. In the line, a rigid pipe connection or a flexible hose connection can be provided which is suitable in each case for the prevailing in the headspace of the storage tank operating pressure.

The innovation also provides that the upper end of the display tube extension extends to the upper end of the storage container. This embodiment can be designed with or without line connection between display tube extension and headspace of the storage container. With the line connection, the level in the storage tank is formed up to a maximum permissible maximum level, which is approved for the respective storage container, according to the principle of communicating tubes adequately. Without this line connection, the filling level in the storage tank is approximately adequate, because according to equation (1) with H1 = H2 it follows that h2 becomes ≈ h1.

The arrangement of the sensors and their respective desirable vertical displaceability is structurally very simple if, as also suggested, the lower sensor on the indicator tube and the upper sensor on either the indicator tube or the indicator tube extension are respectively clamped or other equivalent attachment methods are arranged.

BRIEF DESCRIPTION OF THE DRAWINGS

A more detailed description of the innovation will become apparent from the following description and the accompanying drawings of the drawings and from the claims. While the innovation is realized in various embodiments, in the drawing, a preferred embodiment of a storage container is described with a device according to the invention for detecting two discrete levels.

Show it

1 a schematic representation of a system for self-water supply, inter alia, with a filter container and designed as a pressurized water tank storage tank;

2 a Maßskizze with generally held Maßbezeichnungen of in 1 illustrated pressure water tank in an embodiment according to DIN 4810 for container contents in increments of 150 to 10,000 liters, the actual dimensions depending on the contents of the container resulting from a size chart;

3 in view a pressurized water tank according to 2 , equipped with a device according to the invention, in conjunction with an associated control unit and

4 in an enlarged view of the device according to the innovation according to 3 ,

A plant for own water supply 1000 exists in a known manner, as in 1 shown, from a arranged in a fountain first pump 100 , For example, an underwater pump or piston pump, a subsequent first line section 14 , the raw water W1 a filter container 200 , For example, a gravel filter container, feeds, a second pump 300 , For example, a piston pump, the pure water W2 from the filter tank 200 over a second line section 18 and the pure water W2 via a supply line 20 a storage tank 500 , For example, a pressurized water tank, supplies. At a connection for supply line 8th of the storage container 500 is a supply line 24 connected via which the pure water W2 from the storage tank 500 under the driving effect of an air cushion located above a filling level L. 38 (please refer 3 ) is delivered to points of consumption. The second pump 300 is between the supply line 20 and the second line section 18 with a backwash line 22 bridged, in which a backwash valve 30 is arranged. In the course of backwashing the filter tank 200 for cleaning the adhering to the filter material iron and manganese that enters the storage tank 500 removed pure water W2 after opening the backwash valve 30 over the supply line 20 , the backwash line 22 and the second line section 18 in the filter container 200 and from there via an overflow pipe 16 into the environment (eg gully). The filter container is inter alia with a level switch 26 and a device for water ventilation 28 equipped. The storage tank 500 has a water level indicator 32 , the structure of which will be described in more detail below. A first pressure switch 34 for controlling the second pump 300 and a second pressure switch 36 for backwash control are via a connection for pressure regulator 4 in the head area of the storage tank 500 , preferably on its container shell 13 , connected. A control unit 400 controls the filtration operation in connection with the loading of the storage tank 500 , the backwash and possibly an air cushion monitoring.

2 shows you as a pressurized water tank after DIN 4810 running storage container 500 , This type is in the majority of installations 1000 installed for self-water supply, it is commercially available for container contents of 150 to 10,000 liters in predetermined gradation and consists of the cylindrical container casing 13 , an upper and a lower container bottom 3a . 3b , respectively after DIN 28011 , the lower container bottom 3b preferably on three feet 12 rests, and a variety of ports and openings, in terms of their dimensions and positions in 2 either indicated by concrete measurements or as general measures depending on the in terms of size, container contents are to be taken from a dimension table. These are the following connections and openings:

LIST OF REFERENCE NUMBERS

1

first handhole or manhole lock

2

second handhole or manhole lock

4

Connection for pressure regulator

5

aunter connection for water level gauge

5

boberer connection for water level gauge

6

Connection for pump

7

Connection for emptying

8th

Connection for supply line

9

Connection for venting device

10

Connection for ventilation device

11

spare terminal

The water level indicator 32 (please refer 3 . 4 and 1 ) is at the bottom connection for water level gauge 5a via a lower water level fitting 32.1 and the upper connection for water level gauge 5b via an upper water level fitting 32.2 connected. Between the water level valves 32.1 and 32.2 is an indicator tube 32.3 arranged. The water level valves 32.1 and 32.2 each provide a switchable fluid connection between the interior of the storage container 500 and the interior of the indicator tube 32.3 ago.

The per se known device for detecting a discrete level L in the storage container 500 for liquids, in particular in the pressurized water tank of the system for self-water supply 1000 is, as described above, on the container shell 13 of the storage container 500 arranged. The storage tank 500 stores against a pressure of the air cushion 38 between a minimum level LL and a maximum level HL, which in the prior art embodiment are both below the upper water level fitting 32 are positioned over the feed line 20 supplied liquid W2, the pure water, and if necessary in the supply line 24 from.

The inventive device is based on the above-described prior art and is characterized in a first embodiment in that on the display tube 32.3 from the outside a lower sensor 32.5 for detecting the minimum level LL and optionally an upper sensor 32.6 arranged to detect the maximum level HL. This arrangement of the upper sensor 32.6 is in the embodiment ( 3 . 4 ) not realized. The sensors 32.5 . 32.6 are renewal with the control unit 400 connected and they possess the fitness, physical changes in the indicator tube 32.3 to determine if at the respective location of the sensor 32.5 . 32.6 the liquid W2 in the indicator tube 32.3 present or absent.

The innovation proposes a capacitive or an inductive or a with electrical conductivity changes or a sensor operating with ultrasonic signals 32.5 . 32.6 provided.

According to a particularly advantageous second embodiment of the innovation, in the 3 and 4 is shown is the indicator tube 32.3 over the upper water level fitting 32.2 out into a display tube extension 32.4 extended fluid throughout and continues to be the upper sensor 32.6 in an arrangement position on the display tube extension 32.4 relocated. The advantages and the mode of action of this second embodiment have already been discussed and explained above.

In 3 is in the context of the second embodiment, the maximum level HL in an area above the upper water level fitting 32.2 Approved or planned. The maximum level HL is located at the actual level difference h1 in the storage tank 500 above the upper and relative to the upper water level fitting 32.2 He is in the indicator tube extension 32.4 is displayed as a displayed maximum level HLa and it is located with the displayed level difference h2 in the display tube extension 32.4 also above the upper and relative to the upper water level fitting 32.2 , The approximate relationship between the level differences h1 and h2 can be seen from equation (1) given above and results from the first height of the air cushion volume H1 in the storage container 500 above the upper and relative to the water level fitting 32.2 and the second height of the air cushion volume H2 in the indicator tube extension 32.4 with the same reference position.

In the figures of the drawing, an embodiment is not shown, in which the upper end of the display tube extension 32.4 via a line fluid-continuous with the headspace of the storage container 500 ie with the air cushion there 38 connected is. About this line connection is a pressure equalization between the space above the maximum level HL in the storage tank 500 and the space above the liquid level in the indicator tube extension 32.4 instead of.

In 3 is in addition to the embodiment described above, a further embodiment indicated by dash-dotted lines, in which the upper end of the indicator tube extension 32.4 to the top of the storage tank 500 extend so that the first height of the air cushion volume H1 the same as the second height of the air cushion volume H2 becomes (H1 = H2).

Regarding a simple arrangement of the sensors 32.5 and 32.6 the innovation provides that the lower sensor 32.5 on the indicator tube 32.3 and the upper sensor 32.6 either on the indicator tube 32.3 or the indicator tube extension 32.4 are each arranged by clamping or other equivalent fastening methods. This attachment can also be the desirable vertical displacement of the sensors 32.5 and 32.6 be ensured in a very simple manner.

LIST OF REFERENCE NUMBERS

1000

Anlage zur Eigenwasserversorgung

100

erste Pumpe (Unterwasserpumpe; Kolbenpumpe)

200

Filterbehälter (z. B. Kiesfilterbehälter)

300

zweite Pumpe (Kolbenpumpe)

400

Steuereinheit

500

Speicherbehälter (Druckwasserbehälter)

14

erster Leitungsabschnitt

16

Überlaufleitung

18

zweiter Leitungsabschnitt

20

Zuführleitung

22

Rückspülleitung

24

Versorgungsleitung

26

Niveauschalter

28

Einrichtung zur Wasserbelüftung

30

Rückspülventil

32

Wasserstandsanzeigevorrichtung

32.1

untere Wasserstandsarmatur

32.2

obere Wasserstandsarmatur

32.3

Anzeigerohr

32.4

Anzeigerohr-Verlängerung

32.5

unterer Sensor

32.6

oberer Sensor

34

erster Druckschalter (zur Steuerung der zweiten Pumpe)

36

zweiter Druckschalter (zur Rückspülsteuerung)

38

Luftpolster

L

Füllstand, allgemein

LL

minimaler Füllstand

HL

maximaler Füllstand

HLa

angezeigter maximaler Füllstand

H1

erste Höhe des Luftpolstervolumens (im Speicherbehälter oberhalb der oberen Wasserstandsarmatur)

H2

zweite Höhe des Luftpolstervolumens (in der Anzeigerohr-Verlängerung oberhalb der oberen Wasserstandsarmatur)

W1

Rohwasser

W2

Reinwasser

h1

tatsächliche Füllstandsdifferenz (im Speicherbehälter oberhalb der oberen Wasserstandsarmatur)

h2

angezeigte Füllstandsdifferenz (in der Anzeigerohr-Verlängerung oberhalb der oberen Wasserstandsarmatur)

Fig. 2

500

Speicherbehälter (Druckwasserbehälter)

1

erster Handloch- oder Mannlochverschluss

2

zweiter Handloch- oder Mannlochverschluss

3a

oberer Boden

3b

unterer Boden

4

Anschluss für Druckregler

5a

unterer Anschluss für Wasserstandmesser

5b

oberer Anschluss für Wasserstandmesser

6

Anschluss für Pumpe

7

Anschluss für Entleerung

8

Anschluss für Versorgungsleitung

9

Anschluss für Entlüftungseinrichtung

10

Anschluss für Belüftungseinrichtung

11

Reserveanschluss

12

Fuß

13

Behältermantel

Fig. 1, Fig. 3, Fig. 4

1000

Plant for own water supply

100

first pump (underwater pump, piston pump)

200

Filter container (eg gravel filter container)

300

second pump (piston pump)

400

control unit

500

Storage tank (pressurized water tank)

14

first line section

16

Overflow pipe

18

second line section

20

feed

22

backwash

24

supply line

26

level switch

28

Device for water ventilation

30

Backwash

32

Water level indicator

32.1

lower water level fitting

32.2

upper water level fitting

32.3

display tube

32.4

Indicating tube extension

32.5

lower sensor

32.6

upper sensor

34

first pressure switch (to control the second pump)

36

second pressure switch (for backwashing control)

38

bubble

L

Level, general

LL

minimum level

HL

maximum level

HLa

displayed maximum level

H1

first height of the air cushion volume (in the storage tank above the upper water level fitting)

H2

second height of the air cushion volume (in the indicator tube extension above the upper water level fitting)

W1

raw water

W2

clean water

h1

actual level difference (in the storage tank above the upper water level fitting)

h2

displayed level difference (in the indicator tube extension above the upper water level fitting)

Fig. 2

500

Storage tank (pressurized water tank)

1

first handhole or manhole lock

2

second handhole or manhole lock

3a

upper ground

3b

lower ground

4

Connection for pressure regulator

5a

lower connection for water level gauge

5b

Upper connection for water level gauge

6

Connection for pump

7

Connection for emptying

8th

Connection for supply line

9

Connection for venting device

10

Connection for ventilation device

11

spare terminal

12

foot

13

container jacket

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 non-patent literature

• DIN 4810 [0002]
• DIN 4810 [0021]
• DIN 4810 [0025]
• DIN 28011 [0025]

Claims (7)

Device for detecting a discrete filling level in a storage container for liquids, in particular in a pressurized water container of a system for self-water supply, with a storage container ( 500 ) against a pressure of an air cushion ( 38 ) between a minimum fill level (LL) and a maximum fill level (HL) via a feed line (LL) 20 ) supplied liquid (W2) stores and if necessary in a supply line ( 24 ), with one on a container shell ( 13 ) of the storage container ( 500 ) between a lower connection for water level gauge ( 5a ) and an upper connection for water level gauge ( 5b ) arranged water level indicator device ( 32 ), one from the lower one ( 5a ) arranged lower water level fitting ( 32.1 ) and one in the upper port ( 5b ) arranged upper water level fitting ( 32.2 ) with an indicator tube ( 32.3 ), over which the level (L) is shown, characterized in that • on the indicator tube ( 32.3 ) from the outside a lower sensor ( 32.5 ) for detecting the minimum level (LL) and optionally an upper sensor ( 32.6 ) are arranged to detect the maximum level (HL), • that the sensors ( 32.5 . 32.6 ) with a control unit ( 400 ), and • that the sensors ( 32.5 . 32.6 ) have the ability to detect physical changes in the indicator tube ( 32.3 ), if at the respective location of the sensor ( 32.5 . 32.6 ) the liquid (W2) in the indicator tube ( 32.3 ) present or absent. Apparatus according to claim 1, characterized in that a capacitive or an inductive or with changes in the electrical conductivity or a sensor operating with ultrasonic signals ( 32.5 . 32.6 ) is provided. Device according to claim 1 or 2, characterized in that the indicator tube ( 32.3 ) via the upper water level fitting ( 32.2 ) into an indicator tube extension ( 32.4 ) is extended fluid-consistently, and that the upper sensor ( 32.6 ) in an arrangement position on the indicator tube extension ( 32.4 ) is relocated. Device according to claim 3, characterized in that the upper end of the indicator tube extension ( 32.4 ) via a line fluidly with the headspace of the storage container ( 500 ) connected is. Apparatus according to claim 3 or 4, characterized in that the upper end of the display tube extension ( 32.4 ) to the upper end of the storage container ( 500 ). Device according to one of claims 3 to 5, characterized in that the lower sensor ( 32.5 ) on the indicator tube ( 32.3 ) and the upper sensor ( 32.6 ) either on the indicator tube ( 32.3 ) or the indicator tube extension ( 32.4 ) are respectively arranged by clamping or other equivalent fastening methods. Device according to one of the preceding claims, characterized in that the sensors ( 32.5 . 32.6 ) are each arranged vertically displaceable.

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