Water hardness detection device and method and water treatment device

Abstract

The invention relates to a water hardness detection device and method and a water treatment device. The water hardness detection device comprises a shell, and a detection cavity is formed in the shell; the sampling part is used for adding a water sample to be detected into the detection cavity; the first dosing part is used for adding a complexing agent into the detection cavity; the second dosing part is used for adding a color indicator into the detection cavity; the first detection element is arranged on the shell, and the first detection element is used for respectively detecting the amount of the complexing agent and the amount of the water sample to be detected which are added into the detection cavity; the second detection element is arranged on the shell, and the second detection element is used for detecting the color change of the liquid in the detection cavity. According to the method, the volume of the required complexing agent can be reduced while accurate detection of the water hardness is ensured, the detection period is prolonged, and the detection cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a water hardness detection device, method and water treatment device. Background Art

[0002] As people's living standards continue to improve, the requirements for water quality continue to increase. For example, a water softener needs to detect the hardness of raw water for precise regeneration control, or detect the water hardness to accurately inform users of the softening effect of water to improve user experience; in addition, for other water treatment equipment (such as water purifiers, water heaters, dishwashers, etc.), if the water hardness can be accurately detected, it can also improve the intelligent working level of the product and the user experience, thereby improving the competitiveness of the product.

[0003] At present, the method for detecting water hardness in an experimental environment is to take out a certain volume of the water sample to be tested in advance, add a color indicator (chrome black T) to the water sample to be tested, and the calcium and magnesium ions in the water sample to be tested form a purple-red chelate with the color indicator, and then add a certain volume of complexing agent (EDTA agent) to the water sample to be tested. The instability constant of the purple-red chelate is greater than the instability constant after the EDTA agent combines with the calcium and magnesium ions. Therefore, after the complexing agent is added, the EDTA agent will first form a chelate with the calcium ions and then with the magnesium ions. When the titration is reached to the end point, the liquid no longer appears purple-red, but appears blue as the color indicator (chrome black T).

[0004] The hardness of the water sample to be tested can be obtained by the following formula:

[0005]

[0006] However, since this method requires adding a sufficient amount of chelating agent to the water sample to be tested, the use scenarios of this method are limited. In actual household use scenarios, considering the storage capacity and cost of the chelating agent, it is difficult to use the above method to detect water hardness.

[0007] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a water hardness detection device, method and water treatment device to overcome the defects of the prior art. Summary of the invention

[0008] The object of the present invention is to provide a water hardness detection device, method and water treatment device, which can reduce the volume of the required complexing agent, extend the detection period and reduce the detection cost while ensuring accurate detection of water hardness.

[0009] The purpose of the present invention can be achieved by adopting the following scheme:

[0010] The present invention provides a water hardness detection device, the water hardness detection device comprising:

[0011] A housing having a detection cavity therein;

[0012] A sampling part, the sampling part is used to add the water sample to be tested into the detection cavity;

[0013] A first drug adding part, the first drug adding part is used to add a complexing agent into the detection cavity;

[0014] a second drug adding part, the second drug adding part being used for adding a color indicator into the detection cavity;

[0015] A first detection element, the first detection element is arranged on the housing, and the first detection element is used to respectively detect the amount of the complexing agent and the water sample to be tested added into the detection cavity;

[0016] A second detection element is disposed on the housing and is used to detect a color change of the liquid in the detection cavity.

[0017] In a preferred embodiment of the present invention, the housing is provided with an opening communicating with the detection cavity, and the opening at least includes:

[0018] a first port, the first port being connected to the outlet of the sampling portion in an on-off manner;

[0019] and / or, a second port, the second port being connected to the outlet of the first drug adding portion in an on-off manner;

[0020] And / or, a third port, wherein the third port is connectable and disconnectable to the outlet of the second drug adding part.

[0021] In a preferred embodiment of the present invention, the outlet of the sampling portion is connected to the first port via a first pipeline, and a first on-off valve is provided on the first pipeline or at the first port;

[0022] And / or, the outlet of the first dosing part is connected to the second port via a second pipeline, and a second on-off valve is provided on the second pipeline or at the second port;

[0023] And / or, the outlet of the second dosing part is connected to the third port via a third pipeline, and a third on-off valve is provided on the third pipeline or at the third port.

[0024] In a preferred embodiment of the present invention, the first detection element includes a light sensor, and / or the second detection element includes a color sensor.

[0025] In a preferred embodiment of the present invention, the water hardness detection device includes a housing, and the first detection element is arranged at the upper part or the upper middle part of the housing; and / or the second detection element is arranged at the lower part or the lower middle part of the housing.

[0026] In a preferred embodiment of the present invention, the transmitting end and the receiving end of the first detection element are respectively located on two opposite side walls of the shell; and / or, the transmitting end and the receiving end of the second detection element are respectively located on two opposite side walls of the shell.

[0027] In a preferred embodiment of the present invention, the detection cavity has a liquid discharge port, the liquid discharge port is connected to the inlet of the liquid discharge pipeline, and a fourth on-off valve is provided on the liquid discharge pipeline or at the liquid discharge port.

[0028] In a preferred embodiment of the present invention, the sampling part includes a sampling bottle, a sampling tube and a sampling valve, the outlet of the sampling tube is connected to the inlet of the sampling bottle, and the sampling valve is arranged on the sampling tube or at the inlet of the sampling bottle;

[0029] And / or, the first dosing unit includes a first dosing bottle;

[0030] And / or, the second dosing part includes a second dosing bottle.

[0031] The present invention provides a water hardness detection method, which uses the above-mentioned water hardness detection device to detect water hardness. The water hardness detection method comprises the following steps:

[0032] Add a predetermined volume of the water sample to be tested into the detection chamber;

[0033] Adding a color indicator into the detection chamber so that the liquid in the detection chamber presents a first color;

[0034] Adding a complexing agent of a predetermined concentration into the detection chamber until the liquid in the detection chamber changes from the first color to the second color, and simultaneously detecting a first volume of the complexing agent;

[0035] The water sample to be tested is continuously added into the detection chamber until the liquid in the detection chamber changes from the second color to the first color, and a second volume of the water sample to be tested that is added again is synchronously detected.

[0036] In a preferred embodiment of the present invention, the ratio of the predetermined concentration of the complexing agent to the predetermined volume of the water sample to be tested is greater than 0.01 mol / 50 mL.

[0037] In a preferred embodiment of the present invention, the ratio between the predetermined concentration of the complexing agent and the predetermined volume of the water sample to be tested is 0.0025 mol / L / 4 mL-0.005 mol / L / 0.5 mL.

[0038] In a preferred embodiment of the present invention, the predetermined volume of the water sample to be tested is 0.5 mL-4 mL.

[0039] In a preferred embodiment of the present invention, the predetermined concentration of the complexing agent is 0.0025 mol / L-0.005 mol / L.

[0040] In a preferred embodiment of the present invention, a predetermined volume of a color indicator is added into the detection chamber, and the predetermined volume of the color indicator is 0.03 mL-0.325 mL.

[0041] In a preferred embodiment of the present invention, the predetermined volume of the water sample to be tested and the second volume of the water sample to be tested are measured by the number of drops of the water sample to be tested; and / or, the first volume of the complexing agent is measured by the number of drops of the complexing agent.

[0042] In a preferred embodiment of the present invention, a predetermined volume of color indicator is added into the detection chamber, and the predetermined volume of the color indicator is measured by the number of drops of the color indicator.

[0043] In a preferred embodiment of the present invention, each drop of the water sample to be tested, the complexing agent and the color indicator have the same volume.

[0044] In a preferred embodiment of the present invention, the volume of each drop of the water sample to be tested, the complexing agent and the color indicator is 0.03 mL-0.065 mL.

[0045] In a preferred embodiment of the present invention, the predetermined volume of the water sample to be tested is 20-60 drops.

[0046] In a preferred embodiment of the present invention, the liquid level of the predetermined volume of the water sample to be tested in the detection chamber is 6 mm-20 mm.

[0047] In a preferred embodiment of the present invention, the predetermined volume of the color indicator is 1-5 drops.

[0048] In a preferred embodiment of the present invention, the first color is different from the second color;

[0049] The first color includes red, and / or the second color includes blue.

[0050] In a preferred embodiment of the present invention, the complexing agent includes EDTA-disodium ethylenediaminetetraacetate, and / or the color indicator includes chrome black T.

[0051] The present invention provides a water treatment device, which comprises the water hardness detection device mentioned above.

[0052] In a preferred embodiment of the present invention, the water treatment equipment is a water softening equipment;

[0053] The water softening equipment also includes a water softener, and the soft water outlet of the water softener or the water outlet pipeline connected to the soft water outlet can be connected to the inlet of the sampling part in the water hardness detection device in an on-off manner.

[0054] As described above, the characteristics and advantages of the water hardness detection device, method and water treatment device of the present invention are: the present invention is particularly suitable for the scenario of using a small volume of complexing agent to detect the water hardness of a water sample to be tested, a predetermined volume of the water sample to be tested is added into the detection chamber through the sampling part, a color indicator is added into the detection chamber through the second dosing part, so that the liquid after the predetermined volume of the water sample to be tested and the color indicator are mixed is a first color, and then a complexing agent of a predetermined concentration is added into the detection chamber through the first dosing part until the color of the liquid in the detection chamber changes (from the first color to the second color). The present invention presets a predetermined volume of the water sample to be tested and a predetermined concentration of the complexing agent. Concentration, ensure that the added chelating agent is added in excess relative to the predetermined volume of the water sample to be tested. Therefore, after the color of the liquid in the detection chamber changes, it is necessary to continue to add the water sample to be tested into the detection chamber through the sampling part until the liquid in the detection chamber recovers its initial color (from the second color to the first color), indicating that the chelating agent and the water sample to be tested are added in appropriate amounts at this time. The hardness of the water sample to be tested can be calculated through the volume of the water sample to be tested added twice, the volume of the chelating agent and the concentration of the chelating agent, thereby achieving the goal of reducing the volume of the required chelating agent while ensuring accurate detection of water hardness, extending the detection period of the detection device, and reducing the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0056] in:

[0057] Figure 1 : It is the structural principle diagram of the water hardness detection device of the present invention.

[0058] Figure 2 : It is a structural schematic diagram of the water hardness detection device of the present invention.

[0059] Figure 3 : It is one of the structural schematic diagrams of the shell in the water hardness detection device of the present invention.

[0060] Figure 4 : This is the second structural schematic diagram of the shell in the water hardness detection device of the present invention.

[0061] Figure 5 : is a flow chart of the water hardness detection method of the present invention.

[0062] The accompanying drawings in the present invention are:

[0063] 1. Shell; 101. Detection chamber;

[0064] 2. The first drug adding section; 3. The second drug adding section;

[0065] 4. Sampling unit; 5. First detection element;

[0066] 6. A second detection element; 7. A second pipeline;

[0067] 8. The third pipeline; 9. The first pipeline;

[0068] 10. Second on-off valve; 11. Third on-off valve;

[0069] 12. First on-off valve; 13. Drainage pipeline;

[0070] 14. Fourth on-off valve; 15. Integrated component;

[0071] 16. Mounting frame; 100. Water softener;

[0072] 200, water outlet pipeline; 300, sampling pipeline;

[0073] 400. Fifth on-off valve. DETAILED DESCRIPTION

[0074] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0075] like Figures 1 to 4 As shown, the present invention provides a water hardness detection device, which includes a shell 1, a first dosing part 2, a second dosing part 3, a sampling part 4, a first detection element 5 and a second detection element 6. A detection cavity 101 is formed in the shell 1, the sampling part 4 is used to add a water sample to be tested into the detection cavity 101, the first dosing part 2 is used to add a complexing agent into the detection cavity 101, the second dosing part 3 is used to add a color indicator into the detection cavity 101, the first detection element 5 and the second detection element 6 are respectively arranged on the shell 1, the first detection element 5 is used to respectively detect the amount of the complexing agent and the water sample to be tested added to the detection cavity 101, and the second detection element 6 is used to detect the color change of the liquid in the detection cavity, so as to obtain the reaction end point.

[0076] The water hardness detection device of the present invention is particularly suitable for scenarios where a small volume of complexing agent is used to detect the water hardness of a water sample to be tested (such as water hardness detection of household water, water hardness detection of water in public places, etc.). A predetermined volume of the water sample to be tested is added into the detection chamber 101 through the sampling part 4, and a color indicator is added into the detection chamber 101 through the second dosing part 3, so that the liquid after the predetermined volume of the water sample to be tested and the color indicator are mixed is a first color, and then a predetermined concentration of complexing agent is added into the detection chamber 101 through the first dosing part 2 until the color of the liquid in the detection chamber 101 changes (from the first color to the second color). When using the water hardness detection device of the present invention for detection, the predetermined volume of the water sample to be tested and the predetermined concentration of the complexing agent can be preset to ensure that the added The chelating agent in the detection chamber 101 is added in excess relative to the predetermined volume of the water sample to be tested. Therefore, after the color of the liquid in the detection chamber 101 changes, the amount of the excess chelating agent needs to be detected. At this time, the water sample to be tested needs to be continued to be added into the detection chamber 101 through the sampling part 4 until the liquid in the detection chamber 101 recovers its initial color (from the second color to the first color), indicating that the chelating agent and the water sample to be tested are added in appropriate amounts (there is no excess chelating agent in the detection chamber 101). The hardness of the water sample to be tested can be calculated through the volume of the water sample to be tested added twice, the volume of the chelating agent and the concentration of the chelating agent, thereby achieving the goal of reducing the volume of the required chelating agent while ensuring accurate detection of the water hardness, extending the detection cycle of the detection device, and reducing the detection cost.

[0077] In an optional embodiment of the present invention, Figures 1 to 4 As shown, the housing 1 is provided with an opening connected to the detection chamber 101, and the opening includes at least a first opening, a second opening and a third opening connected to the inside of the detection chamber 101; the sampling part 4 has an outlet and an inlet, and the outlet of the sampling part 4 is connected to the first opening of the detection chamber 101 in an on-off manner, and the water sample to be tested can be quantitatively added to the detection chamber 101 by controlling the on-off between the outlet of the sampling part 4 and the first opening of the detection chamber 101; the first dosing part 2 has an outlet and an inlet, and the outlet of the first dosing part 2 is connected to the second opening of the detection chamber 101 in an on-off manner, and the complexing agent can be quantitatively added to the detection chamber 101 by controlling the on-off between the outlet of the first dosing part 2 and the second opening of the detection chamber 101; the second dosing part 3 has an outlet and an inlet, and the outlet of the second dosing part 3 is connected to the third opening of the detection chamber 101 in an on-off manner, and the color indicator can be quantitatively added to the detection chamber 101 by controlling the on-off between the outlet of the second dosing part 3 and the third opening of the detection chamber 101.

[0078] Further, if Figures 1 to 4As shown, the outlet of the sampling part 4 is connected to the first port of the detection chamber 101 through a first pipeline 9, and a first on-off valve 12 is provided on the first pipeline 9 or at the first port of the detection chamber 101. During the detection process, the on-off relationship between the outlet of the sampling part 4 and the first port of the detection chamber 101 is controlled by controlling the on or off state of the first on-off valve 12, so as to quantitatively add the water sample to be tested.

[0079] Further, such as Figures 1 to 4 As shown, the outlet of the first dosing part 2 is connected to the second port of the detection chamber 101 through a second pipeline 7, and a second on-off valve 10 is provided on the second pipeline 7 or at the second port of the detection chamber 101. During the detection process, the on-off relationship between the outlet of the first dosing part 2 and the second port of the detection chamber 101 is controlled by controlling the on or off state of the second on-off valve 10, so as to quantitatively add the complexing agent.

[0080] Further, such as Figures 1 to 4 As shown, the outlet of the second dosing part 3 is connected to the third port of the detection chamber 101 through a third pipeline 8, and a third on-off valve 11 is provided on the third pipeline 8 or at the third port of the detection chamber 101. During the detection process, the on-off relationship between the outlet of the second dosing part 3 and the third port of the detection chamber 101 is controlled by controlling the on or off state of the third on-off valve 11, so as to quantitatively add the color indicator.

[0081] Further, in a preferred embodiment of the present invention, Figures 2 to 4 As shown, the water hardness detection device also includes an integrated component 15, which has at least a first flow channel, a second flow channel and a third flow channel. The inlet of the first flow channel is connected to the outlet of the sampling part 4, the outlet of the first flow channel is connected to the inlet of the first pipeline 9, and the outlet of the first pipeline 9 is connected to the first port of the detection chamber 101; the inlet of the second flow channel is connected to the outlet of the first dosing part 2, the outlet of the second flow channel is connected to the inlet of the second pipeline 7, and the outlet of the second pipeline 7 is connected to the second port of the detection chamber 101; the inlet of the third flow channel is connected to the outlet of the second dosing part 3, the outlet of the third flow channel is connected to the inlet of the third pipeline 8, and the outlet of the third pipeline 8 is connected to the third port of the detection chamber 101. Through the setting of the integrated component 15, the sampling part 4, the first dosing part 2 and the second dosing part 3 can be installed in a centralized manner to reduce the volume, which is suitable for installation in small spaces such as kitchens.

[0082] In an optional embodiment of the present invention, Figures 1 to 4As shown, the detection chamber 101 is formed in the housing 1, and the first port, the second port and the third port of the detection chamber 101 are arranged at the top of the housing 1. The first detection element 5 is arranged at the upper part or the upper middle part of the housing 1, wherein the first detection element 5 is preferably arranged on the side wall of the housing 1 and close to the top position of the housing 1, so that the addition amount of the complexing agent and / or the water sample to be tested can be accurately detected to avoid being affected by the liquid in the detection chamber 101. The second detection element 6 is arranged at the lower part or the lower middle part of the housing 1, wherein the second detection element 6 is preferably arranged on the side wall of the housing 1 and close to the bottom position of the housing 1, so that when there are fewer water samples to be tested in the detection chamber 101, the color change can be accurately detected, thereby accurately determining the reaction end point.

[0083] Specifically, the housing 1 is a rectangular housing, and the first port, the second port and the third port of the detection chamber 101 are arranged side by side at the top of the housing 1. A mounting frame 16 is provided at the top of the housing 1, and the first on-off valve 12, the second on-off valve 10 and the third on-off valve 11 are all fixed on the mounting frame 16, and the mounting frame 16 provides an installation position for the first on-off valve 12, the second on-off valve 10 and the third on-off valve 11.

[0084] In this embodiment, if Figures 1 to 4 As shown, the first detection element 5 includes a light sensor, the transmitting end and the receiving end of the light sensor are respectively arranged on two opposite side walls of the housing 1, and the transmitting end and the receiving end of the light sensor are at the same height in the vertical direction. The detection signal is sent out by the transmitting end of the light sensor, and the detection signal is received by the receiving end of the light sensor. When liquid (complexing agent or water sample to be tested) drips between the transmitting end and the receiving end of the light sensor, it will be collected by the light sensor, so that the number of drops of the complexing agent or the water sample to be tested can be known, and then the amount of the complexing agent or the water sample to be tested can be obtained. Of course, the first detection element 5 used is not limited to light sensors, and other detection equipment can also be used, which can collect and measure the number of drops entering the detection cavity 101 when adding the complexing agent or the water sample to be tested.

[0085] In this embodiment, if Figures 1 to 4 As shown, the second detection element 6 includes a color sensor, the transmitting end and the receiving end of the color sensor are respectively arranged on two opposite side walls of the housing 1, and the transmitting end and the receiving end of the color sensor are at the same height in the vertical direction. The detection signal is sent out by the transmitting end of the color sensor, and the detection signal is received by the receiving end of the color sensor. When the color of the liquid (complexing agent or water sample to be tested) changes, the color change of the liquid will be recognized by the color sensor. When the color sensor recognizes that the color of the liquid has changed, it can be determined as the end point of the reaction, and at this moment, the complexing agent or the water sample to be tested is stopped from being added to the detection chamber 101. Of course, the second detection element 6 used is not limited to the color sensor, and other detection equipment can also be used, which can accurately identify the color change of the complexing agent or the water sample to be tested.

[0086] In an optional embodiment of the present invention, Figures 1 to 4 As shown, the detection chamber 101 has a liquid discharge port, which is arranged at the bottom of the housing 1 and communicated with the detection chamber 101, and is connected to the inlet of the liquid discharge pipeline 13, and a fourth on-off valve 14 is arranged on the liquid discharge pipeline 13 or at the liquid discharge port of the detection chamber 101. During the detection process, the fourth on-off valve 14 is controlled to be in an off state; after the detection is completed, the liquid in the detection chamber 101 can be discharged by controlling the fourth on-off valve 14 to be turned on.

[0087] In an optional embodiment of the present invention, Figures 2 to 4 As shown, the first dosing part 2 includes a first dosing bottle; the second dosing part 3 includes a second dosing bottle; the sampling part 4 includes a sampling bottle, a sampling tube and a sampling valve, the outlet of the sampling tube is connected to the inlet of the sampling bottle, and the sampling valve is arranged on the sampling tube or at the inlet of the sampling bottle.

[0088] The characteristics and advantages of the water hardness detection device of the present invention are:

[0089] The water hardness detection device is connected to the detection chamber 101 through the sampling part 4, the first dosing part 2 and the second dosing part 3 respectively, and a certain amount of water sample to be tested, a chelating agent and a color indicator can be added to the detection chamber 101 respectively. Since the chelating agent has a predetermined concentration, it is ensured that when a small volume of chelating agent is added, the amount of chelating agent added is still excessive relative to the predetermined volume of the water sample to be tested. Therefore, in order to ensure the accuracy of the detection, it is necessary to continue to add the water sample to be tested into the detection chamber 101 to ensure that the chelating agent and the water sample to be tested are added in appropriate amounts. Then, the hardness of the water sample to be tested can be calculated through the volume of the water sample to be tested, the volume of the chelating agent and the concentration of the chelating agent added twice, so that the detection device of the present invention can be used in the scenario of using a small volume of chelating agent to detect the hardness of the water sample to be tested, which not only ensures the accurate detection of water hardness, but also can reduce the volume of the chelating agent, extend the detection cycle of the detection device, and reduce the detection cost. It is particularly suitable for the scenario of using a small volume of chelating agent to detect the water hardness of the water sample to be tested.

[0090] like Figures 1 to 5 As shown, the present invention provides a water hardness detection method, which uses the above-mentioned water hardness detection device to detect water hardness, and the water hardness detection method includes the following steps:

[0091] Step S1: adding a predetermined volume of a water sample to be tested into the detection chamber 101;

[0092] Step S2: adding a color indicator into the detection chamber 101 so that the liquid in the detection chamber 101 presents a first color;

[0093] Step S3: adding a complexing agent of a predetermined concentration into the detection chamber 101 until the liquid in the detection chamber 101 changes from a first color to a second color, and simultaneously detecting a first volume of the complexing agent;

[0094] Step S4: continue to add the water sample to be tested into the detection chamber 101 until the liquid in the detection chamber changes from the second color to the first color, and simultaneously detect the second volume of the water sample to be tested that is added again.

[0095] Since the water hardness detection method of the present invention needs to be applicable to the scenario where a small volume of complexing agent can be used to detect the water hardness of the water sample to be tested, the predetermined volume of the water sample to be tested added for the first time can be set according to the predetermined concentration of the complexing agent to ensure that even if a small volume (such as one drop) of complexing agent is added, the complexing agent can still be ensured to be excessive in the predetermined volume of the water sample to be tested. Therefore, the water hardness can be detected even when only a small volume of complexing agent is added. However, since the complexing agent is excessive in the predetermined volume of the water sample to be tested, it is necessary to continue to detect the excess part of the complexing agent to meet the accuracy of the detection. Based on this, after the color of the liquid in the detection chamber 101 changes (from the first color to the second color) after adding a complexing agent of a predetermined concentration to the detection chamber 101, it is necessary to continue to add the water sample to be tested to the detection chamber 101 until the liquid in the detection chamber 101 restores the initial color (from the second color to the first color again), indicating that the complexing agent and the water sample to be tested are added in appropriate amounts at this time (there is no excessive complexing agent in the detection chamber 101). The hardness of the water sample to be tested can be calculated by the following formula based on the volume of the water sample to be tested added twice, the volume of the complexing agent and the concentration of the complexing agent, thereby achieving the goal of reducing the volume of the required complexing agent while ensuring accurate detection of the water hardness, extending the detection cycle of the detection device, and reducing the detection cost. Among them, the formula for obtaining the hardness of the water sample to be tested is:

[0096]

[0097] The concentration of the complexing agent is the above-mentioned predetermined concentration, the volume of the complexing agent is the above-mentioned first volume, and the volume of the water sample to be tested is the sum of the above-mentioned predetermined volume and the second volume.

[0098] In an optional embodiment of the present invention, the first color needs to be different from the second color in order to accurately obtain the reaction endpoint. Wherein, the complexing agent may be but not limited to EDTA-disodium ethylenediaminetetraacetate, and the color indicator may be but not limited to chrome black T. Therefore, after adding a predetermined volume of chrome black T to a predetermined volume of the water sample to be tested, the first color of the liquid in the detection chamber 101 is red, and after adding the first volume of EDTA-disodium ethylenediaminetetraacetate to the detection chamber 101, the liquid in the detection chamber 101 will turn from red to blue, and then continue to add the second volume of the water sample to be tested, the liquid in the detection chamber 101 will turn from blue to red again.

[0099] In an optional embodiment of the present invention, the ratio of the predetermined concentration of the complexing agent to the predetermined volume of the water sample to be tested is greater than 0.01 mol / L / 50 mL.

[0100] In the present invention, the ratio of the predetermined concentration of the complexing agent to the predetermined volume of the water sample to be tested is set to be greater than 0.01 mol / L / 50 mL because: the national standard (GB / T 5750.4-2023) uses the disodium ethylenediaminetetraacetic acid titration method to detect the hardness of water samples. When measuring 50 mL of water sample, the concentration of the complexing agent selected is 0.01 mol / L. Specifically, 50 mL of water sample is taken and placed in a conical flask, 5 drops of chrome black T indicator are added, and the concentration of Na2O3 at a concentration of 0.01 mol / L is immediately used. 2Titrate EDTA (complexing agent) until the solution changes from purple-infrared to pure blue, and record the amount. Since the scenario used by the disodium ethylenediaminetetraacetic acid titration method adopted in the national standard is not limited by the volume of the complexing agent and the volume of the water sample to be tested, a complexing agent with a lower concentration (such as 0.01mol / L) can be used when measuring a water sample with a larger volume (such as 50mL). At this time, the water sample volume is large and the complexing agent concentration is low. The initial stage of adding the complexing agent to the water sample is not easy to cause an excessive amount of complexing agent. Therefore, when the water sample volume is large and the complexing agent concentration is low, the detection method in the national standard can obtain a more accurate detection result. However, the water hardness detection device and method in the present invention need to be used in actual life scenarios, so it is necessary to limit the volume of the complexing agent and the volume of the water sample to be tested, so that accurate detection results can be obtained by using a small volume of complexing agent and a water sample to be tested. Therefore, in order to reduce the volume of the complexing agent required in the detection process, the concentration of the complexing agent is increased, and the high concentration of the complexing agent is added to the water sample to be tested. In order to ensure that the calcium and magnesium ions in the water sample to be tested can be fully combined with the complexing agent, it is arranged in the present invention that even when one drop of complexing agent is added, the volume of the complexing agent is excessive. It is precisely because of the existence of the excessive complexing agent that the water sample to be tested needs to be added to the liquid in the subsequent steps to ensure that the excess complexing agent can also participate in the reaction, thereby achieving the effect of accurately detecting the hardness of the water sample to be tested in a small space, a small amount of complexing agent and the water sample to be tested.

[0101] In this embodiment, the ratio between the predetermined concentration of the complexing agent and the predetermined volume of the water sample to be tested is set to 0.0025 mol / L / 4 mL-0.005 mol / L / 0.5 mL.

[0102] Furthermore, in this embodiment, the predetermined volume of the water sample to be tested can be set to 0.5mL-4mL. The water sample to be tested with the predetermined volume within this range can ensure the accuracy of the detection, so that the detection error is controlled within 5%. In addition, after the water sample to be tested with the predetermined volume within this range is added to the detection chamber 101, the liquid level of the water sample to be tested in the detection chamber 101 can reach 6mm-20mm, so as to ensure that the second detection element 6 located on the housing 1 can accurately collect the color change in the detection chamber 101, and ensure that the end point of the color change is accurately determined.

[0103] Furthermore, in this embodiment, the predetermined concentration of the complexing agent can be set to 0.0025mol / L-0.005mol / L. Even if a small amount (such as one drop) of the complexing agent within the predetermined concentration range is added to the detection chamber 101, it can still combine with the calcium and magnesium ions in the predetermined volume of the water sample to be tested, so that the liquid in the detection chamber 101 changes from the first color to the second color, and the complexing agent in the detection chamber 101 is still in an excess state (that is, some complexing agent still remains and has not combined with the calcium and magnesium ions).

[0104] In step S2, a predetermined volume of color indicator is added into the detection chamber 101. The predetermined volume of the color indicator may be, but is not limited to, 0.03 mL to 0.325 mL. The amount of the color indicator added may be adjusted according to the predetermined volume of the water sample to be tested, so as to ensure that the color of the water sample to be tested can be changed to the first color after the color indicator is added.

[0105] In an optional embodiment of the present invention, based on the fact that the amount of complexing agent used is added in small amounts, the water hardness detection device described above can be used to drip the water sample to be tested, the complexing agent and the color indicator into the detection chamber 101 in a dripping manner. During the dripping process, the number of drops of the water sample to be tested is measured by the first detection element 5, and the predetermined volume of the water sample to be tested and the second volume of the water sample to be tested are respectively obtained according to the number of drops of the water sample to be tested; in addition, the number of drops of the complexing agent is measured by the first detection element 5, and the first volume of the complexing agent is obtained according to the number of drops of the complexing agent. After the first number of drops corresponding to the predetermined volume of the water sample to be tested and the second number of drops corresponding to the second volume are obtained, and after the number of drops corresponding to the first volume of the complexing agent and the concentration of the complexing agent are obtained, the hardness of the water sample to be tested can be obtained according to the following formula:

[0106]

[0107] Among them, the complexing agent concentration is the above-mentioned predetermined concentration, the number of complexing agent drops is the number of drops corresponding to the above-mentioned first volume, and the number of water sample drops to be tested is the sum of the first number of drops corresponding to the above-mentioned predetermined volume and the second number of drops corresponding to the above-mentioned second volume.

[0108] In this embodiment, in order to ensure the accuracy of the detection, it is necessary to ensure that each drop of the water sample to be tested and the complexing agent have the same or approximately the same volume. Therefore, the first port and the second port of the detection cavity 101 in the water hardness detection device can be set to be micropores (diameter can be but not limited to 1mm), and the water sample to be tested and the complexing agent naturally drip from the first port and the second port respectively, so as to achieve the purpose of each drop of the water sample to be tested and the complexing agent having the same or approximately the same volume.

[0109] In addition, in this embodiment, for the convenience of measurement, a predetermined volume of color indicator is added to the detection chamber 101, and the predetermined volume of the color indicator is measured by the number of drops of the color indicator, and it is ensured that each drop of the color indicator has the same or approximately the same volume as each drop of the water sample to be tested and the complexing agent.

[0110] Furthermore, in this embodiment, the volume of each drop of the water sample to be tested, the complexing agent and the color indicator can be, but is not limited to, 0.03 mL to 0.065 mL. The predetermined volume of the water sample to be tested is 20 to 60 drops; the predetermined volume of the color indicator is 1 to 5 drops, so as to ensure that the second detection element 6 located on the housing 1 can accurately collect the color change in the detection cavity 101, and ensure that the color change endpoint is accurately determined.

[0111] The characteristics and advantages of the water hardness detection method of the present invention are:

[0112] This water hardness detection method only requires a small volume of chelating agent to detect the hardness of the water sample to be tested, thereby ensuring accurate detection of water hardness while reducing the volume of the required chelating agent, extending the detection cycle of the detection device, and reducing the detection cost. The method is particularly suitable for water hardness detection in scenarios such as household water and water hardness detection in public places.

[0113] The present invention provides a water treatment device, which comprises the water hardness detection device mentioned above.

[0114] In an optional embodiment of the present invention, Figure 2 As shown, the water treatment equipment is a water softening equipment. The water softening equipment also includes a water softener 100, and the soft water outlet of the water softener 100 can be connected to the inlet of the sampling part 4 in the water hardness detection device in an on-off manner, so that the water softened by the water softener 100 can be stored in the sampling part 4 as a water sample to be tested, and then the water hardness of the water softened by the water softener 100 can be tested by the water hardness detection device. It should be noted that the soft water outlet of the water softener 100 can be directly connected to the inlet of the sampling part 4 in the water hardness detection device, and a sampling line 300 can also be connected to the water outlet line 200 connected to the soft water outlet, and the sampling line 300 can be connected to the inlet of the sampling part 4 in the water hardness detection device in an on-off manner.

[0115] Furthermore, a fifth on-off valve 400 may be provided on the sampling pipeline 300, and the on or off state of the fifth on-off valve 400 may be controlled to control the input of the water sample to be tested into the sampling part 4 of the water hardness detection device.

[0116] The water treatment device of the present invention has the characteristics and advantages of the above-mentioned water hardness detection device and method, which will not be repeated here.

[0117] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A water hardness detection device, characterized in that: The water hardness detection device comprises: A housing having a detection cavity therein; A sampling part, the sampling part is used to add the water sample to be tested into the detection cavity; A first drug adding part, the first drug adding part is used to add a complexing agent into the detection cavity; a second drug adding part, the second drug adding part being used for adding a color indicator into the detection cavity; A first detection element, the first detection element is arranged on the housing, and the first detection element is used to respectively detect the amount of the complexing agent and the water sample to be tested added into the detection cavity; A second detection element is disposed on the housing and is used to detect a color change of the liquid in the detection cavity.

2. The water hardness detection device according to claim 1, characterized in that: The housing is provided with an opening communicating with the detection cavity, and the opening at least includes: a first port, the first port being connected to the outlet of the sampling portion in an on-off manner; and / or, a second port, the second port being connected to the outlet of the first drug adding portion in an on-off manner; And / or, a third port, wherein the third port is connectable and disconnectable to the outlet of the second drug adding part.

3. The water hardness detection device according to claim 2, characterized in that: The outlet of the sampling part is connected to the first port via a first pipeline, and a first on-off valve is provided on the first pipeline or at the first port; And / or, the outlet of the first dosing part is connected to the second port via a second pipeline, and a second on-off valve is provided on the second pipeline or at the second port; And / or, the outlet of the second dosing part is connected to the third port via a third pipeline, and a third on-off valve is provided on the third pipeline or at the third port.

4. The water hardness detection device according to claim 1, characterized in that: The first detection element includes a light sensor, and / or the second detection element includes a color sensor.

5. The water hardness detection device according to any one of claims 1 to 4, characterized in that: The first detection element is arranged at the upper part or the upper middle part of the shell; and / or the second detection element is arranged at the lower part or the lower middle part of the shell.

6. The water hardness detection device according to claim 5, characterized in that: The transmitting end and the receiving end of the first detection element are respectively located on two opposite side walls of the shell; and / or the transmitting end and the receiving end of the second detection element are respectively located on two opposite side walls of the shell.

7. The water hardness detection device according to claim 1, characterized in that: The detection cavity has a liquid discharge port, and the liquid discharge port is connected to the inlet of a liquid discharge pipeline. A fourth on-off valve is arranged on the liquid discharge pipeline or at the liquid discharge port.

8. The water hardness detection device according to claim 1, characterized in that: The sampling part includes a sampling bottle, a sampling tube and a sampling valve, the outlet of the sampling tube is connected to the inlet of the sampling bottle, and the sampling valve is arranged on the sampling tube or at the inlet of the sampling bottle; And / or, the first dosing unit includes a first dosing bottle; And / or, the second dosing part includes a second dosing bottle.

9. A method for detecting water hardness, characterized in that: The water hardness detection device according to any one of claims 1 to 8 is used to detect the water hardness, and the water hardness detection method comprises the following steps: Add a predetermined volume of the water sample to be tested into the detection chamber; Adding a color indicator into the detection chamber so that the liquid in the detection chamber presents a first color; Adding a complexing agent of a predetermined concentration into the detection chamber until the liquid in the detection chamber changes from the first color to the second color, and simultaneously detecting a first volume of the complexing agent; The water sample to be tested is continuously added into the detection chamber until the liquid in the detection chamber changes from the second color to the first color, and a second volume of the water sample to be tested that is added again is synchronously detected.

10. The water hardness detection method according to claim 9, characterized in that: The ratio of the predetermined concentration of the complexing agent to the predetermined volume of the water sample to be tested is greater than 0.01 mol / L / 50 mL.

11. The water hardness detection method according to claim 10, characterized in that: The ratio between the predetermined concentration of the complexing agent and the predetermined volume of the water sample to be tested is 0.0025 mol / L / 4 mL-0.005 mol / L / 0.5 mL.

12. The water hardness detection method according to claim 11, characterized in that: The predetermined volume of the water sample to be tested is 0.5 mL-4 mL.

13. The water hardness detection method according to claim 12, characterized in that: The predetermined concentration of the complexing agent is 0.0025 mol / L-0.005 mol / L.

14. The water hardness detection method according to claim 9, characterized in that: A predetermined volume of a color indicator is added into the detection chamber, wherein the predetermined volume of the color indicator is 0.03 mL to 0.325 mL.

15. The water hardness detection method according to any one of claims 9 to 14, characterized in that: The predetermined volume of the water sample to be tested and the second volume of the water sample to be tested are measured by the number of drops of the water sample to be tested; and / or, the first volume of the complexing agent is measured by the number of drops of the complexing agent.

16. The water hardness detection method according to claim 15, characterized in that: A predetermined volume of color indicator is added into the detection chamber, and the predetermined volume of the color indicator is measured by the number of drops of the color indicator.

17. The water hardness detection method according to claim 16, characterized in that: Each drop of the water sample to be tested, the complexing agent and the color indicator have the same volume.

18. The water hardness detection method according to claim 17, characterized in that: The volume of each drop of the water sample to be tested, the complexing agent and the color indicator is 0.03 mL-0.065 mL.

19. The water hardness detection method according to claim 18, characterized in that: The predetermined volume of the water sample to be tested is 20-60 drops.

20. The water hardness detection method according to claim 19, characterized in that: The liquid level height of the predetermined volume of the water sample to be tested in the detection chamber is 6mm-20mm.

21. The water hardness detection method according to claim 18, characterized in that: The predetermined volume of the color indicator is 1-5 drops.

22. The water hardness detection method according to claim 9, characterized in that: The first color is different from the second color; The first color includes red, and / or the second color includes blue.

23. The water hardness detection method according to claim 9, characterized in that: The complexing agent includes EDTA-disodium ethylenediaminetetraacetate, and / or the color indicator includes chrome black T.

24. A water treatment device, characterized in that: The water treatment device comprises the water hardness detection device according to any one of claims 1 to 8.

25. The water treatment device according to claim 24, characterized in that: The water treatment equipment is a water softening equipment; The water softening equipment also includes a water softener, and the soft water outlet of the water softener or the water outlet pipeline connected to the soft water outlet can be connected to the inlet of the sampling part in the water hardness detection device in an on-off manner.

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