Dosing system for liquid chemicals
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- SEKO
- Filing Date
- 2024-07-03
- Publication Date
- 2026-05-13
Smart Images
Figure IB2024056489_09012025_PF_FP_ABST
Abstract
Description
[0001] DOSING SYSTEM FOR LIQUID CHEMICALS
[0002] * * *
[0003] The present invention concerns a closing system configured to dose one or more liquid chemical products in one or more washing apparatus which allows in a precise, simple, reliable, efficient and economical way to control the quantity of each of said one or more chemical products liquids which is mixed with a diluent, for example water, and supplied together with the diluent, i.e. dosed, in each of said one or more washing apparatus .
[0004] In the following description, reference will be made mainly to applications of the dosing system according to the invention in the industrial or domestic washing apparatus sector, in particular for clothing and / or linen (e.g. industrial or domestic washing machines), as well as for crockery and / or cookware (eg industrial or domestic dishwashers). However, it must be kept in mind that the dosing system according to the invention can be applied in any othertechnological context in which the quantity of one or more liquid chemical products that is mixed with a diluent, for example water, such as in the water treatment sector, always remaining within the scope of the present invention defined by the attached claims.
[0005] Furthermore, in the remainder of the present description, reference will be made mainly to applications of the dosing system according to the invention comprising venturi effect dosing or mixing devices and in which the diluent consists of water. However, it must be kept in mind that the dosing system according to the invention can also include different dosing or mixing devices, such as for example dosing pumps, and / or the diluent can also be different from water, always remaining within the scope of the present invention defined by the attached claims.
[0006] It is known that in the washing apparatus sector it is necessary that a liquid chemical product, stored in a container, such as a bag or a can, is mixed with a diluent, typically water, according to a precise dosage and the mixture of water and liquid chemical product is supplied to a washing apparatus. In this regard, a washing apparatus, such as for example a washing machine or a dishwasher, operates according to one or more washing programs or formulas which usually include a sequence of phases in some of which different liquid chemical products can be dosed into the washing apparatus with each other and / or in different quantities between the various phases which are mixed with water.
[0007] In particular, the variability of water pressure can influence the characteristics of the mixture of liquid chemicals with water in an unpredictable way, making precise control of the dosage of liquid chemicals complex and difficult. This complexity and difficulty are increased in the case of systems comprising a plurality of washing devices.
[0008] In the prior art, some solutions have been developed to control the dosage of liquid chemicals. By way of example, document EP3462271A1 describes a dosing system in which the dosing duration of a chemical product is regulated on the basis of the pressure of the diluent before mixing, while document EP0403296 describes a dosing system in which the dosage is regulated on the based on frequent recalibrations, the use of peristaltic pumps, the use of capacitive devices to verify the presence of chemical liquids in the flow directed to the washing machines, and the use of a single flow meter placed upstream of the mixing devices of chemical liquids .
[0009] However, prior art solutions suffer from some drawbacks.
[0010] First of all, they do not allow the quantity of liquid chemical products that are dosed into the washing apparatus to be precisely controlled, given that this control is influenced by pressure drops in the hydraulic pipes and by the viscosity of the chemical products.
[0011] Furthermore, prior art solutions are complex, not entirely reliable, requiring frequent calibrations, thus often involving significant manufacturing and / or installation and / or maintenance costs.
[0012] The aim of the present invention is, therefore, to allow in a precise, simple, reliable, efficient and economical way to control the quantity of one or more liquid chemical products which is mixed with a diluent, for example water, and which is dosed in one or more washing devices.
[0013] The specific object of the present invention is a dosing system configured to dose one or more liquid chemical products in one or more washing apparatus, in which the dosing system includes at least one hydraulic input duct configured to be connected to a water network and at least an outlet hydraulic duct, one or more mixing hydraulic ducts connected between said at least one inlet hydraulic duct and said at least one outlet hydraulic duct and on each of which a respective solenoid valve is arranged, in which downstream of the respective solenoid valve there is a respective dosing device, which is configured to dose a respective liquid chemical product of said one or more liquid chemicals when a diluent flows in the hydraulic mixing conduit, wherein said at least one hydraulic outlet conduit is in turn connected to a hydraulic inlet duct of a distribution unit, in which the distribution unit includes one or more distribution solenoid valves, each of which is arranged on a respective hydraulic distribution duct connected, downstream of the distribution solenoid valve, to a corresponding washing apparatus of sayings one or more washing apparatus, in which the dosing system also includes an electronic processing unit configured to be operationally connected to said one or more washing apparatus, an input flow meter arranged on said at least one hydraulic input duct upstream of said one or more hydraulic mixing ducts and an output flow meter arranged on said at least one hydraulic output duct downstream of said one or more hydraulic mixing ducts, in which the electronic processing unit is operationally connected to the input flow meter, to the one or more solenoid valves of said one or more hydraulic mixing ducts, to the outlet flow meter, and to said one or more distribution solenoid valves, in which the electronic processing unit is configured to receive flow rate values measured by the outlet flow meter and from the inlet flow meter and for measuring and controlling a quantity of said one or more liquid chemical products dosed in said one or more washing apparatus on the basis of said measured flow rate values.
[0014] In particular, the electronic processing unit is configured to control said one or more solenoid valves of said one or more hydraulic mixing ducts and said one or more distribution solenoid valves to dose a quantity of said one or more liquid chemical products in said one or more washing devices based on said flow rate values measured.
[0015] According to one aspect of the invention, the electronic processing unit can be configured to receive in real time the flow rate values measured by the output flow meter and the input flow meter.
[0016] According to another aspect of the invention, the electronic processing unit can be configured to measure a quantity of said one or more liquid chemical products dosed in said one or more washing apparatus by performing the difference between the flow rate value measured by the output flow meter and the flow rate value measured by the inlet flow meter.
[0017] According to a further aspect of the invention, the electronic processing unit can be configured to control said one or more solenoid valves of said one or more hydraulic mixing ducts and said one or more distribution solenoid valves to dose a quantity of said one or more liquid chemical products in said one or more washing apparatus on the basis of said difference between measured flow rate values.
[0018] According to another aspect of the invention, the dosing system can also include an inlet pressure sensor arranged on said at least one hydraulic duct upstream of said one or more mixing hydraulic ducts, in which the inlet pressure sensor is configured for detecting a pressure of a diluent flowing in said at least one inlet hydraulic conduit, wherein the electronic processing unit is also operatively connected to the inlet pressure sensor and is configured to receive a pressure value therefrom and to compensate variations of a measurement sensitivity of the input flow meter and a measurement sensitivity of the output flow meter based on the pressure value received.
[0019] According to a further aspect of the invention, the one or more dosing devices arranged on said one or more hydraulic mixing ducts can be Venturi effect mixers, each having a suction line configured to be connected to a respective container containing a corresponding liquid chemical product of said one or more liquid chemical products.
[0020] According to an additional aspect of the invention, on the suction line of each of said one or more venturi effect mixers there can be arranged a non-return valve configured to allow a flow of liquid chemical product from the suction line to the respective hydraulic mixing duct of said one or more hydraulic mixing ducts.
[0021] According to another aspect of the invention, the electronic processing unit can be configured to be operationally connected to each of said one or more washing apparatuses via a respective activation or trigger interface operationally connected to a corresponding washing apparatus of said one or more washing devices.
[0022] According to a further aspect of the invention, the dosing system can comprise a main unit operatively connected to an additional extension module, wherein said at least one hydraulic inlet duct comprises or consists of a main hydraulic inlet duct of the main unit and an input hydraulic duct of the additional extension module connected to each other, wherein said at least one output hydraulic duct includes or consists of an output hydraulic duct of the main unit and an output hydraulic duct of the additional extension module connected to each other , wherein the electronic processing unit is arranged in the main unit, wherein at least one of the said one or more mixing hydraulic conduits is arranged in the main unit and at least one of the said one or more mixing hydraulic conduits is arranged in the additional extension module, whereby the inlet flow meter is arranged on the main inlet hydraulic duct of the main unit and the outlet flow meter is arranged on the outlet hydraulic duct of the additional extension module.
[0023] The advantages offered by the dosing system according to the invention are evident, given that it solves all the aforementioned problems of the prior art.
[0024] First of all, it allows you to precisely control the quantity of liquid chemical products that are dosed in one or more washing devices, in particular in each washing phase.
[0025] Furthermore, the dosing system according to the invention is simple, reliable and efficient, in particular without requiring frequent recalibrations.
[0026] Furthermore, it has extremely low costs in relation to its manufacturing, installation and maintenance, making it economical.
[0027] The present invention will now be described, by way of illustration, but not by way of limitation, according to its preferred embodiments, with particular reference to Figure 1 of the attached drawings, which shows an electrical and hydraulic diagram of a preferred embodiment of the dosing system according to the invention.
[0028] With reference to Figure 1, it can be observed that a preferred embodiment of the dosing system according to the invention is configured to dose one of ten liquid chemical products, each of which is contained in a respective container 50A-50J, in four 60A-60D washing machines.
[0029] The dosing of liquid chemicals is carried out using ten respective venturi effect mixers, indicated with the reference numbers 1240A-1240F and 2240G-2240J, on respective dedicated channels for each liquid chemical product that is mixed with water.
[0030] The dosing system of Figure 1 includes a main unit 1000 operationally connected to an additional extension module 2000, which extends the electrical and hydraulic circuit of the main unit 1000, and a multiple dispensing unit 3000 operationally connected to the additional extension module 2000 and to the four washing machines 60A-60D . In particular, the multiple dispensing unit 3000 is electrically and hydraulically connected to the additional extension module 2000, and is also hydraulically connected to the four washing machines 60A-60D via four respective channels. Furthermore, the multiple dispensing unit 3000 is electrically connected to four activation or trigger interfaces 80A-80D, each of which is connected to a respective of the four washing machines 60A-60D; each of the four trigger interfaces 80A-80D is in turn electrically connected with a respective one of four wash program selectors 70A-70D. The electrical connection between the main unit 1000, the additional extension module 2000 , the multiple dispensing unit 3000, the trigger interfaces 80A-80D and the washing program selectors 70A- 70D is advantageously implemented via a CAN Bus.
[0031] It must be kept in mind that other embodiments of the dosing system according to the invention can be configured to dose one or more liquid chemical products in a single washing machine, or in a single washing apparatus other than a washing machine , and in this case the dosing system does not have the multiple dispensing unit 3000, always remaining within the scope of protection of the present invention as defined in the attached claims.
[0032] Furthermore, it must be kept in mind that other embodiments of the dosing system according to the invention can be configured to dose one or more liquid chemicals via only the main unit 1000 , and in this case the dosing system lacks the module additional 2000 extension, always remaining within the scope of protection of the present invention as defined in the attached claims.
[0033] The main unit 1000 conventionally includes a main switch 1110, connected between the electrical network 1100 and a power supply stage 1120 which supplies power to the entire dosing system via a multiple driving unit 1140, or driver, which is at its once connected to an electronic processing unit 1130, such as a CPU or a microprocessor. The electronic processing unit 1130 receives power from the multiple driver unit 1140 and bidirectionally exchanges signals relating to commands and detections to be sent to and / or coming from the components of the dosing system.
[0034] The multiple driver unit 1140 is also connected to a multiple solenoid valve driving interface 1150 connected to seven solenoid valves, indicated with the reference numbers 1230A-1230F and 1230L, each of which is arranged on a respective hydraulic mixing duct of seven ducts hydraulic mixing valves on which, downstream of the solenoid valve, a respective venturi effect mixer of seven venturi effect mixers is arranged, indicated with the reference numbers 1240A-1240F and 1240L. A respective container 50A-50F containing a corresponding liquid chemical product, in which the non-return valve is configured to allow the flow of liquid chemical product from the respective 50A-50F container to the respective mixing hydraulic conduit, i.e. from the suction line to the respective mixing hydraulic conduit, whereby the corresponding liquid chemical product is mixed with water when it flows into the respective duct mixing plumber . The suction line of the seventh 1240L venturi-effect mixer is not connected to any container, but only to a 1250L non-return valve, so no mixing takes place in the respective hydraulic pipe.
[0035] It must be kept in mind that other embodiments of the dosing system according to the invention may lack, on the hydraulic pipe in which no mixing of water with liquid chemical product takes place, the seventh 1240L venturi effect mixer and the related non-return valve, return 1250L, always remaining within the scope of protection of the present invention as defined in the attached claims.
[0036] The seven hydraulic mixing ducts are connected, upstream of the seven respective solenoid valves 1230A-1230F and 1230L, to a main hydraulic inlet duct 1500 which is in turn connected to the water network 1200. Furthermore, the seven hydraulic mixing ducts are connected, to downstream of the seven respective venturi effect mixers 1240A-1240F and 1240L, to an outlet hydraulic conduit 1600. On the main inlet hydraulic conduit 1500, upstream of the seven mixing hydraulic conduits, there are arranged an inlet pressure sensor 1210, which is configured to detect the pressure of the water coming from the water network 1200, and an inlet flow meter 1220, which is configured to detect the flow rate of water in the main inlet conduit 1500.
[0037] As mentioned, the extension module 2000 extends the electrical and hydraulic circuit of the main unit 1000. For this purpose, the extension module 2000 includes a multiple driver unit 2140 electrically connected to the multiple driver unit 1140 of the main unit 1000 from which it receives power and bidirectionally exchanges signals relating to commands and detections to be sent and / or coming from the components of the dosing system. The multiple driver unit 2140 of the additional extension module 2000 is also connected to a multiple solenoid valve piloting interface 2150 connected to four solenoid valves, indicated with the reference numbers 2230G- 2230J, each of which is arranged on a respective hydraulic duct mixing of four additional hydraulic mixing ducts on which, downstream of the solenoid valve, a respective venturi effect mixer of four venturi effect mixers is arranged, indicated with the reference numbers 2240G- 2240J. To the suction line of each of the four 2240G-2240J venturi effect mixers is connected, via a respective non-return valve of four 2250G-2250J non-return valves, a respective 50G-50J container containing a corresponding liquid chemical product, for which this is mixed with water when it flows into the respective hydraulic pipe. The four hydraulic mixing ducts of the additional extension module 2000 are connected, upstream of the four respective solenoid valves 2230G- 2230J, to an input hydraulic duct 2500 which is in turn connected to the main hydraulic input duct 1500 of the main unit 1000. Furthermore , these four hydraulic mixing ducts are connected, downstream of the four respective venturi effect mixers 2240G-2240J, to the main unit 1000. A flow meter is arranged on the outlet hydraulic duct 2600, downstream of the four hydraulic mixing ducts 2260 outlet, which is configured to detect the flow rate of water in the outlet plumbing pipe 2600 of the additional extension module 2000.
[0038] The multiple distribution unit 3000 includes a multiple driver unit 3140 electrically connected to the multiple driver unit 2140 of the additional extension module 2000 from which it receives power and bidirectionally exchanges signals relating to commands and detections to be sent and / or coming from the components of the dosing system. In particular, the multiple driver unit 3140 of the multiple distribution unit 3000 is connected to the four trigger interfaces 80A-80D, as mentioned, advantageously via a CAN Bus. The multiple driver unit 3140 of the multiple distribution unit 3000 is also connected to a multiple solenoid valve driving interface 3150 connected to four distribution solenoid valves, indicated with the reference numbers 3230A-3230D, each of which is arranged on a respective duct hydraulic system of four hydraulic distribution ducts connected to a corresponding one of the four 60A-60D washing machines. The four hydraulic distribution ducts are connected, upstream of the four respective distribution solenoid valves 3230A-3230D, to an input hydraulic duct 3500 which is in turn connected to the output hydraulic duct 2600 of the additional extension module 2000.
[0039] In the washing system according to the invention, the eleven solenoid valves 1230A- 1230F, 1230L and 2230G-2230J are powered, under control of the electronic processing unit 1130, one at a time so as to make the entire flow rate flow into the respective duct mixing through the corresponding venturi effect mixer downstream of the open valve. In the event that the venturi effect mixer has the suction line connected to a container containing a liquid chemical product, the flow of water in the respective hydraulic mixing pipe activates the venturi effect mixer which consequently sucks in the liquid chemical product.
[0040] Thanks to the fact that the eleven solenoid valves 1230A-1230F, 1230L and 2230G-2230J are powered one at a time , one liquid chemical product is dosed at a time, avoiding mixtures and contamination between liquid chemical products contained in the different containers 50A- 50J. As mentioned, if the 1230L solenoid valve is powered, no mixing takes place in the respective hydraulic pipe. In other words, the set of solenoid valves acts as a chemical product selector.
[0041] The 1250A-1250F and 2250G-2250J non-return valves on the suction lines of the 1240A- 1240F and 2240G-2240J venturi effect mixers for each chemical product prevent the backflow of fluid, i.e. mixing water with a liquid chemical product inside the respective 50A-50G containers, thus preventing dangerous mixtures of different liquid chemicals and preserving the purity of the liquid chemicals contained inside the 50A-50G containers. The 1250L non-return valve present on the suction line of the 1240L venturi effect mixer prevents the reflux of fluid towards the outside.
[0042] The liquid chemical product diluted with water, dosed by each venturi effect mixer of the ten venturi effect mixers 1240A-1240F and 2240G-2240J, flows into the outlet flowmeter 2260 of the hydraulic conduit 2600 at the outlet of the additional extension module 2000 and then into the hydraulic duct 3500 entering the multiple distribution unit 3000 and, via the four distribution solenoid valves 3230A-3230D controlled by the electronic processing unit 1130, into the hydraulic distribution ducts and downstream of these into the corresponding four washing machines 60A-60D. Advantageously, in the preferred embodiment of the washing system according to the invention, the distribution channels 3230A-3230D are powered one at a time so as to manage one washing machine at a time among the four washing machines 60A-60D.
[0043] The dosing system according to the invention is configured to measure the flow rate of water in the main inlet hydraulic conduit 1500 via the inlet flow meter 1220 and to measure the flow rate of the fluid, i.e. water possibly mixed with a liquid chemical product, in the hydraulic outlet duct 2600 of the additional extension module 2000 and, consequently, of the fluid that reaches one of the four washing machines 60A-60D by means of the multiple dispensing unit 3000. When the solenoid valve corresponding to one of the ten venturi effect mixers 1240A- 1240F and 2240G-2240J, the fluid flowing in the hydraulic outlet duct 2600 of the additional extension module 2000 is a mixture of water and liquid chemical product sucked in by the relevant venturi effect mixer. The electronic processing unit 1130 is configured to receive the flow rate values measured by the outlet flow meter 2260 and the inlet flow meter 1220 and on the basis of them it is configured to measure the flow rate of the aspirated liquid chemical product and, consequently, the volume , i.e. the quantity of the liquid chemical product aspirated overall in the period of activation ofthe relevant venturi effect mixerand consequently to control the dosage of the liquid chemical product aspirated in the four washing machines 60A- 60D. In other words, the electronic processing unit 1130 is configured to control said one or more solenoid valves (1230A-1230F, 2230G-2230J) of said one or more hydraulic mixing ducts and said one or more solenoid valves (3230A-3230D) of distribution for dosing a quantity of said one or more liquid chemical products in said one or more washing apparatus (60A-60D) on the basis of said measured flow rate values.
[0044] In particular, the electronic processing unit 1130 can be configured to perform the difference between the flow rate value measured by the output flow meter 2260 and the flow rate value measured by the input flow meter 1220. In other words, the electronic processing unit 1130 is configured to control said one or more solenoid valves (1230A-1230F, 2230G-2230J) of said one or more hydraulic mixing ducts and said one or more solenoid valves (3230A-3230D) of distribution for dosing a quantity of said one or more liquid chemical products in said one or more washing apparatus (60A-60D) based on the value of said difference. Consequently, the dosing system according to the invention is configured to precisely control the dosing of liquid chemical product in the washing machine into which the fluid is introduced, without the need to carry out any calibration, given that the measurement of the flow rates in real time is independent of the pressure drops in the hydraulic circuit of the dosing system downstream of the water network and from the viscosities of the liquid chemical products.
[0045] To improve the accuracy of the measurements, the electronic processing unit 1130 is configured to compensate for variations in the sensitivity of the flowmeter measurements dependent on the water pressure in the main hydraulic inlet pipe 1500. In particular, in the preferred embodiment of the dosing system, the flow meter is a turbine flow meter whose coefficient k (pulses / litre) is not generally constant but, especially at low pressures of the water flowing in the flow meter, is variable . To compensate for this variability, the electronic processing unit 1130 is configured to receive from the inlet pressure sensor 1210 the value of the water pressure in the main inlet hydraulic pipe 1500 and to compensate the flow rate values measured by the outlet flow meter 2260 and from the input flow meter 1220 on the basis of an electronic correction that takes into account experimental data.
[0046] In this way the dosing system according to the invention is also able to adapt to variations in flow rate, and consequently in pressure, due to the different operating conditions depending on the installation of the dosing system which influence for example the lengths of pipes and ducts, the height of the various components from the ground. This implies a further advantage in terms of accuracy of the dosing system according to the invention, allowing to compensate for a physiological variation in the flow rate detected by the flow meters in the presence of water pressure conditions in the main hydraulic inlet pipe.
[0047] It should be borne in mind that other embodiments of the dosing system according to the invention may have the processing unit which is not configured to compensate for variations in the sensitivity of the flowmeter measurements dependent on the water pressure in the main hydraulic inlet conduit. , always remaining within the scope of protection of the present invention as defined in the attached claims.
[0048] In the foregoing, the preferred embodiments have been described and variations of the present invention have been suggested, but it is to be understood that those skilled in the art will be able to make modifications and changes without thereby departing from the relevant scope of protection, as defined by the claims, attached.
Claims
CLAIMS1. Dosing system configured to dose one or more liquid chemicals into one or more washing apparatus (60A-60D), wherein the dosing system includes at least one inlet hydraulic duct (1500, 2500) configured to be connected to a water network (1200) and at least one outlet hydraulic duct (1600, 2600), one or more mixing hydraulic duct connected between said at least one inlet hydraulic duct (1500, 2500) and said at least one outlet hydraulic duct (1600, 2600) and on each one of which a respective solenoid valve (1230A-1230F, 2230G-2230J) is arranged, wherein downstream of the respective solenoid valve (1230A-1230F, 2230G-2230J) a respective dosing device (1240A-1240F, 2240G-2240J) is arranged, which is configured to dose a respective liquid chemical product of said one or more liquid chemicals when a diluent flows into the mixing hydraulic duct, wherein said at least one outlet hydraulic duct (1600, 2600) is in turn connected to an inlet hydraulic duct (3500) of a distribution unit (3000), wherein the distribution unit (3000) comprises one or more distribution solenoid valves (3230A-3230D) each one of which is arranged on a respective hydraulic distribution duct connected, downstream of the distribution solenoid valve, to a corresponding washing apparatus of said one or more washing apparatuses (60A-60D), wherein the dosing system further includes an electronic processing unit (1130) configured to be operatively connected to said one or more washing apparatuses (60A-60D), an inlet flow meter (1220) arranged on said at least one inlet hydraulic duct (1500, 2500) upstream of said one or more mixing hydraulic ducts, and an outlet flow meter (2260) arranged on said at least one outlet hydraulic duct (1600, 2600) downstream of said one or more mixing hydraulic ducts, wherein the electronic processing unit (1130) is operatively connected to the inlet flow meter (1220), to the one or more solenoid valves (1230A-1230F, 2230G-2230J) of said one or more mixing hydraulic ducts, to the outlet flow meter (2260), and to said one or more distribution solenoid valves (3230A-3230D), wherein the electronic processing unit (1130) is configured to receive flow rate values measured by the outlet flow meter (2260) and inlet flow meter (1220), and to measure a quantity of said one or more liquid chemicals dosed into said one or more washing apparatuses (60A-60D) on the basis of said measures flow rate values, and to control the one or more solenoid valves (1230A-1230F, 2230G-2230J) of said one or more mixing hydraulic ducts and the said one or more distribution solenoid valves (3230A-3230D) to dose a quantity of said one or more liquid chemicals into said one or more washing apparatuses (60A-60D) on the basis of said measures flow rate values.
2. Dosing system according to claim 1, wherein the electronic processing unit (1130) is configured to receive in real time the flow rate values measured by the outlet flow meter (2260) and inlet flow meter (1220).
3. Dosing system according to claim 1 or 2, wherein the electronic processing unit (1130) is configured to measure a quantity of said one or more liquid chemicals dosed into said one or more washing apparatuses (60A-60D) performing the difference between a flow rate value measured by the outlet flow meter (2260) and a flow rate value measured by the inlet flow meter (1220).
4. Dosing system according to claim 3, wherein the electronic processing unit (1130) is configured to control the one or more solenoid valves (1230A-1230F, 2230G-2230J) of said one or more mixing hydraulic ducts and the said one or more distribution solenoid valves (3230A- 3230D) to dose a quantity of said one or more liquid chemicals into said one or more washing apparatuses (60A-60D) on the basis of said difference between measured flow rates.
5. Dosing system according to claim 1, further comprising an inlet pressure sensor (1210) arranged on said at least one hydraulic duct (1500, 2500) upstream of said one or more mixing hydraulic ducts, wherein the inlet pressure sensor (1210) is configured to detect a pressure of a diluent flowing in said at least one inlet hydraulic duct (1500, 2500), wherein the electronic processing unit (1130) is further operatively connected to the inlet pressure sensor (1210) and is configured to receive a pressure value therefrom and to compensate for variations of a measurement sensitivity of the input flow meter (1220) and of a measurement sensitivity of the output flow meter (2260) based on the received pressure value.
6. Dosing system according to claim 1 or 5, wherein the one or more dosing devices (1240A-1240F, 2240G-2240J) arranged on said one or more mixing hydraulic ducts are venturi mixers each one having a suction line configured to be connected to a respective container (50G- 50J) containing a corresponding liquid chemical product of said one or more liquid chemical products.
7. Dosing system according to claim 6, wherein a check valve is arranged on the suction line of each one of said one or more venturi mixers (1240A-1240F, 2240G-2240J) that is configured to allow a flow of liquid chemical product from the suction line to the respective mixing hydraulic duct of said one or more mixing hydraulic ducts.
8. Dosing system according to any one of the preceding claims, wherein the electronic processing unit (1130) is configured to be operatively connected to each one of said one or morewashing apparatuses (60A-60D) through a respective trigger interface (80A-80D) operatively connected to a corresponding washing apparatus of said one or more washing apparatuses (GOA- GOD) .
9. Dosing system according to any one of the preceding claims, comprising a main unit (1000) operatively connected to an additional extension module (2000), wherein said at least one inlet hydraulic duct (1500, 2500) comprises or consists of a main inlet hydraulic duct (1500) of the main unit (1000) and an inlet hydraulic duct (2500) of the additional extension module (2000) connected to each other, wherein said at least one outlet hydraulic duct (1600, 2600) comprises or consists of an outlet hydraulic duct (1600) of the main unit (1000) and an outlet hydraulic duct (2600) of the additional extension module (2000) connected to each other, wherein the electronic processing unit (1130) is arranged in the main unit (1000), wherein at least one of said one or more mixing hydraulic ducts is arranged in the main unit (1000) and at least one of said one or more mixing hydraulic ducts is arranged in the additional extension module (2000), thereby the inlet flow meter (1220) is arranged on the main inlet hydraulic duct (1500) of the main unit (1000) and the outlet flow meter (2260) is arranged on the outlet hydraulic duct (2600) of the additional extension module (2000).