Method for judging whether liquid is entering a target container, liquid taking device and water quality analyzer

Abstract

The present invention relates to the field of liquid extraction control technology, and discloses a method for judging whether a target container has been filled with liquid, a liquid extraction device, and a water quality analyzer. The method for judging whether a target container has been filled with liquid comprises the following steps: a liquid filling step, in which liquid is input into the target container; an irradiation step, in which a light source arranged on one side of the target container irradiates a specified interval along the rising direction of the liquid surface toward the target container; a detection step, in which a light intensity sensor arranged opposite to the light source across the target container is used to detect the light intensity value passing through the target container; and a notification step, in which a notification message is issued if the change in the light intensity value is less than a threshold value during the liquid filling step. The method for judging whether a target container has been filled with liquid of the present invention can more sensitively judge whether the liquid transfer is performed as scheduled during the liquid filling process in a relatively low-cost manner, and notify when it is not performed.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid extraction control, and in particular to a method for judging whether a target container has liquid inflow, a liquid extraction device and a water quality analyzer. Background Art

[0002] In existing water quality analysis systems, such as online water quality analysis systems, liquid collection equipment is required to add the liquid to be tested and various reagents into a reaction pool, and the test results are obtained by analyzing and testing the mixed liquid.

[0003] In the process of filling the reaction pool with liquid, if the liquid to be tested or the reagent in the liquid storage tank has been exhausted, or the liquid collection device itself has malfunctioned, etc., the liquid collection device will perform the liquid filling action but fail to actually transfer the liquid (for example, when the liquid collection device is an electronic syringe, although the electronic syringe performs the movement of the piston rod, no liquid is actually drawn into the electronic syringe, and no liquid is actually discharged into the reaction pool by the electronic syringe), thereby distorting the measurement result, and the water quality analysis system itself cannot be aware of the fault condition, let alone inform the user of it.

[0004] In the prior art, such as the Chinese patent with patent publication number CN110412659A, a method for judging whether a test sample is supplied is disclosed, which uses a linear light source to irradiate the test light from one side of the reaction pool, and a photoelectric sensor on the other side of the reaction pool receives the test light and converts the received test light signal into an electrical signal. When the electrical signal received and output by the photoelectric sensor exceeds a specified threshold, it is judged that the test sample is supplied.

[0005] However, this judgment method is only applicable to the addition of one liquid. When the liquid level reaches the detection point specified by the linear light source, the electrical signal output by the photoelectric sensor changes suddenly and reaches the specified threshold value to judge that the liquid has reached the predetermined liquid level. Therefore, whether the liquid is added before reaching the predetermined liquid level cannot be effectively detected by the photoelectric sensor. At the same time, after reaching the predetermined liquid level, new liquid needs to be added. When the liquid level continues to rise, the subsequent liquid level changes cannot be effectively detected by the photoelectric sensor. As a result, there are problems such as the inability to detect the process of liquid addition and the inability to detect when multiple liquids are added. Summary of the invention

[0006] The present invention is proposed to solve the above technical problems, and aims to provide a method for determining whether a target container has liquid input, which can determine whether a liquid taking device has executed liquid input in a relatively sensitive manner at a low cost, and inform when it has not been executed.

[0007] Specifically, the present invention provides a method for determining whether liquid is being introduced into a target container, for determining whether liquid is being introduced into the target container, and the determination method comprises the following steps:

[0008] a liquid introduction step of introducing liquid into a target container;

[0009] The step of irradiating a light source disposed on one side of the target container toward the target container and irradiating a predetermined interval along a direction in which the liquid level rises;

[0010] A detection step of detecting the light intensity value transmitted through the target container by means of a light intensity sensor disposed opposite to the light source across the target container;

[0011] If the change in the light intensity value is less than the threshold value during the liquid feeding step, a notification step is performed to send a notification message.

[0012] By arranging light sources and light intensity sensors on both sides of the target container opposite to each other, and using the light intensity sensor to receive and detect the light intensity information transmitted through the target container, the liquid filling of the target container can be monitored in a non-contact manner. On the one hand, there will be no contact contamination to the liquid in the target container. On the other hand, the rising of the liquid level (liquid surface) within the specified interval in the target container can be sensitively reflected by the change in the light intensity value. When the liquid level (liquid surface) does not rise, the light intensity value measured by the light intensity sensor can maintain a relatively stable state, so that the execution of the liquid filling can be judged according to the comparison between the change in the light intensity value and the threshold value, and the liquid filling monitoring can be completed sensitively and stably. Because the light source covers the specified interval range along the rising direction of the liquid surface, during the liquid filling process, whether the liquid surface rises within the specified interval range, that is, whether the liquid is filled into the specified interval range as scheduled, can be detected according to the change in the light intensity value. Moreover, the light source and the light intensity sensor are both arranged outside the target container, which has the advantages of low price and easy access.

[0013] In addition, as a preferred technical solution, the liquid feeding step also includes:

[0014] A first liquid adding step is performed to add the first liquid into the target container; and a second liquid adding step is performed to add the second liquid into the target container after the first liquid adding step is completed.

[0015] According to this preferred embodiment, during the process of adding different liquids, because in the irradiation step, the light source can irradiate and cover a specified interval range along the rising direction of the liquid surface, therefore, during the liquid filling process, whether the liquid level of the first liquid and the liquid level of the second liquid rise within the specified interval can be detected based on the change in the light intensity value.

[0016] Further, preferably, the prescribed interval range irradiated by the light source covers at least the liquid level position corresponding to the predetermined addition amount of the first liquid and the liquid level position corresponding to the sum of the predetermined addition amounts of the first liquid and the second liquid.

[0017] According to this preferred embodiment, because the specified interval range of the light source illumination at least covers the liquid level position corresponding to the predetermined addition amount of the first liquid, the addition process of the first liquid and whether the addition reaches the predetermined addition amount will be reflected by the change of the light intensity value and detected; because the specified interval range of the light source illumination at least covers the liquid level position corresponding to the sum of the predetermined addition amounts of the first liquid and the second liquid, when the second liquid is continued to be added on the basis of the first liquid, the addition process of the second liquid and whether the addition reaches the predetermined addition amount will also be reflected by the change of the light intensity value and detected; at the same time, because the liquid level is still within the specified interval range of the light source illumination after the first liquid and the second liquid are each added in the predetermined addition amount, when other liquids such as the third liquid are continued to be added on this basis, whether the liquid level will rise can still be reflected by the change of the light intensity value and detected.

[0018] In addition, preferably, after the step of adding the second liquid, at least one step of adding the third liquid is further included, wherein:

[0019] The predetermined amount of the first liquid to be added is greater than the predetermined amount of the second liquid or the third liquid to be added.

[0020] According to this preferred solution, the first liquid with the largest predetermined amount, such as the sample liquid, is added first, so that the liquid level in the target container directly rises to the specified interval range of the light source, so that it is within the range of the light intensity change that can be measured. The second liquid and the third liquid with smaller predetermined amounts are added later, and the amount of liquid level rise they can bring is smaller, so there is no need to set an excessively large specified interval range of the light source, and after the second liquid and the third liquid are added, the liquid level in the target container can still be within the specified interval range of the light source, so that it can be sensitively detected by the light intensity sensor.

[0021] Further, as a preference, the plurality of liquids are added into the target container via a through hole opened at the bottom of the target container.

[0022] According to this preferred embodiment, adding liquid from the bottom can reduce the fluctuation of the liquid level in the target container, and also avoid the situation where the liquid blocks or interferes with the measurement light path of the light intensity sensor during the falling process when adding liquid from the top, thereby interfering with the measurement.

[0023] In addition, preferably, the target container is a transparent container having a cylindrical side wall.

[0024] According to the preferred embodiment, the side wall of the target container is cylindrical, which can enhance the refraction of light emitted by the light source at the interface of the side wall, so that changes in liquid level can cause more obvious changes in light intensity, thereby improving the detection sensitivity of the light intensity sensor to liquid level changes.

[0025] In addition, preferably, the light source is a divergent light source.

[0026] According to the preferred embodiment, a divergent light source is used to illuminate the target container. On the one hand, the irradiable range of the light source can cover more parts of the target container. On the other hand, the directions of the light rays emitted by the divergent light source are different. Relative to the target container with a cylindrical side wall, the incident angles of the light rays at the interface are also different, so the refraction changes brought about are more complex and diverse. The complex and diverse refraction changes can cause changes in the liquid level to cause more obvious changes in light intensity, thereby further improving the detection sensitivity of the light intensity sensor to liquid level changes.

[0027] The present invention also provides a liquid taking device, comprising:

[0028] target container;

[0029] A liquid inlet device for inputting liquid into a target container;

[0030] An irradiation device disposed on one side of the target container, facing the target container and irradiating a specified interval of the target container along the rising direction of the liquid level;

[0031] A detection device including a light intensity sensor disposed opposite to the irradiation device across the target container, detecting the light intensity value transmitted through the target container;

[0032] If the change in the light intensity value is less than a threshold value during the process of the liquid inlet device inputting liquid into the target container, a notification device is provided to send a notification message.

[0033] In addition, preferably, the target container is a transparent container having a cylindrical side wall.

[0034] In addition, preferably, the irradiation device is a divergent light source.

[0035] In addition, preferably, a through hole is opened at the bottom of the target container, and the liquid is added into the target container through the through hole.

[0036] The present invention also provides a water quality analyzer, which includes the liquid collection device in the aforementioned technical solution.

[0037] In addition, preferably, the target container is a reaction cell of a water quality analyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 11 is a flow chart of a method for determining whether a target container has liquid inflow in Embodiment 1 of the present invention (I);

[0039] Figure 2 2 is a flow chart of a method for determining whether a target container has liquid inflow in the first embodiment of the present invention (II);

[0040] Figure 3 3 is a flow chart of a method for determining whether a target container has liquid inflow in the first embodiment of the present invention;

[0041] Figure 4 1 is a schematic diagram of the structure of the target container entering liquid in the first embodiment of the present invention (parallel light source);

[0042] Figure 5 1 is a schematic diagram of the structure of the target container entering liquid in the first embodiment of the present invention (illustrating the refraction of light from a divergent light source);

[0043] Figure 6 1 is a schematic diagram of the structure of the target container entering liquid in the first embodiment of the present invention (divergent light source);

[0044] Figure 7 It is a schematic diagram of the structure of the liquid taking device in the second embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 1. Target container; 11. Through hole; 2. Liquid inlet device; 21. Multi-way valve; 22. Infusion tube; 3. Light source; 4. Light intensity sensor; 5. Notification device; 6. Liquid container. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings of the specification. The accompanying drawings schematically and simply show the method for determining whether a target container has liquid inflow and the structure of a liquid taking device.

[0048] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] Implementation Method 1

[0050] The first embodiment of the present invention provides a method for determining whether a target container has liquid inflow. Figure 1As shown, in each process of adding liquid to the target container 1, the light intensity value of the light passing through the liquid in the target container 1 is determined, and the change ΔI of the light intensity value is used to determine whether the liquid inflow into the target container 1 is executed according to the predetermined liquid inflow amount. Specifically, the method for determining whether the liquid inflow into the target container includes the following steps:

[0051] A liquid introduction step of inputting liquid into the target container 1;

[0052] The light source 3 is arranged on one side of the target container 1, facing the target container 1, and irradiating a prescribed interval range along the rising direction of the liquid level;

[0053] A detection step of detecting the light intensity value transmitted through the target container 1 by a light intensity sensor 4 disposed opposite to the light source 3 across the target container 1;

[0054] If, during the liquid-intake step, the light intensity value variation ΔI is less than the threshold value I0, a notification step of sending notification information is performed.

[0055] Compared with the prior art, the method for judging whether the target container has been filled with liquid provided in the present embodiment can monitor the liquid filling process of the target container 1 by arranging the light source 3 and the light intensity sensor 4 on both sides of the target container 1 opposite to each other, and using the light intensity sensor 4 to receive and detect the light intensity information irradiated by the light source 3 through the target container 1, in a non-contact manner, that is, a non-contact manner with both the liquid itself and the target container 1. On the one hand, no contact contamination will be caused to the liquid in the target container 1, and on the other hand, the rising situation of the liquid level in the target container 1 can be sensitively reflected by the change amount ΔI of the light intensity value detected by the light intensity sensor 4, and when the liquid level does not rise, the light intensity value measured by the light intensity sensor 4 maintains a relatively stable state, so that the execution of liquid filling can be judged according to the change rate of the light intensity value, for example, by comparing the change amount ΔI within a specified time period with the threshold value I0, thereby sensitively and stably realizing real-time monitoring of liquid filling. Moreover, the light source 3 and the light intensity sensor 4 have the advantages of being inexpensive and easy to obtain.

[0056] In particular, because the light source 3 covers a specified interval along the rising direction of the liquid level, whether the liquid level rises within the specified interval during the liquid filling process, that is, whether the liquid is filled into the specified interval according to the predetermined liquid filling amount, can be detected based on the change in the light intensity value.

[0057] In this embodiment, the "specified interval range" refers to the interval range in the direction of the liquid level rise for which the target container 1 needs (or can) be judged for liquid inflow. Specifically, for the light source 3, in the absence of external objects blocking the light, the "specified interval range" it irradiates covers the specified section in the direction of the liquid level rise of the target container 1. The "specified section" can be a liquid level change section from the starting liquid inflow position to the completed liquid inflow position, or it can be a liquid level change section included in the liquid inflow process. When multiple liquids need to be inflowed, the "specified section" preferably includes the liquid level change section including the mixed liquid level formed after each liquid is inflowed.

[0058] The change in light intensity value ΔI refers to the difference between two light intensity values ​​detected by the light intensity sensor 4 after a certain specified time period. The light intensity value may increase or decrease. In this embodiment, the change in light intensity value ΔI is presented in the form of an absolute value. In other embodiments, the change ΔI may also be presented in the form of a positive or negative number. In addition, the change ΔI may also be the change before and after the start or end of the addition of a certain liquid, and the length of the time period is not particularly limited.

[0059] The threshold value I0 refers to a pre-set critical value or critical range of the light intensity value change that can distinguish whether the liquid is effectively added to the target container 1. In other words, if the detected light intensity value change does not exceed the threshold, it is determined that the liquid is not effectively added to the target container 1. If the detected light intensity value change is greater than or equal to the threshold, it is determined that the liquid is effectively added to the target container 1. The threshold can be obtained by repeatedly performing the liquid filling step-irradiation step-detection step of this embodiment for multiple times, and recording and evaluating.

[0060] In this embodiment, if the change ΔI of the light intensity value is less than the threshold value I0, it indicates that the liquid has not been successfully added or the volume of the added liquid is insufficient. If the change ΔI of the light intensity value is greater than the threshold value I0, it indicates that the liquid has been successfully added or is in the process of adding the liquid. The set threshold value I0 may vary depending on the type of liquid.

[0061] The notification information refers to the information reflecting that the liquid filling process or state in the target container 1 is not executed as scheduled in the notification step. Specifically, after comparing the data information of the difference between two light intensity values ​​detected by the light intensity sensor 4 in a certain time period, that is, the change amount ΔI of the light intensity value, with the threshold value I0, when the condition that the change amount ΔI of the light intensity value is less than the threshold value I0 is met, the prompt information such as electrical signal, light, sound, vibration, etc. is output.

[0062] Specifically, during the process of liquid inletting, the target container 1 and the liquid in the target container 1 are illuminated by the light source 3 arranged on one side of the target container 1. After the light emitted by the light source 3 penetrates the target container 1 and the liquid in the target container 1, it is received by the light intensity sensor 4 arranged on the other side of the target container 1. The light intensity sensor 4 detects the light intensity value after passing through the target container 1. Then, for example, at the beginning of the liquid inletting period, the change ΔI of the light intensity value detected before adding a certain liquid and after a certain liquid should be added is compared with the set threshold value I0. If the change ΔI of the light intensity value is not less than the threshold value I0, it indicates that the liquid is actually added to the target container 1, that is, it indicates that the liquid inletting is normal. If the change ΔI of the light intensity value is less than the threshold value I0, it indicates that the liquid is not actually added to the target container 1, that is, it indicates that the liquid is not correctly inlet or the inlet amount is insufficient. At this time, according to the informing step, a notification message is issued to inform the staff or related equipment that there is an abnormal situation of liquid inletting into the target container 1, and the staff can deal with the relevant fault problems in time according to the notification message.

[0063] Similarly, during the liquid filling process, if the liquid cannot be continuously filled according to the predetermined process due to equipment failure or insufficient liquid volume, that is, the liquid filling is unexpectedly stopped, during the stop period, because no liquid or less than the predetermined amount of liquid is added to the target container 1, the change in the light intensity value ΔI becomes smaller or even approaches zero, so it can be judged that the change in the light intensity value ΔI is less than the threshold value I0, indicating that the liquid has not been actually added to the target container 1 during the stop period, that is, it is detected that during the liquid filling process, the liquid is not filled correctly or the amount of liquid filled is insufficient.

[0064] In the liquid feeding step of the preferred embodiment, there may be at least two liquids fed into the liquid, see Figure 2 As shown, the liquid adding step at this time includes a first liquid adding step of adding the first liquid into the target container 1 , and after the first liquid adding step is completed, a second liquid adding step of adding the second liquid into the target container 1 .

[0065] In an embodiment of the present invention, the irradiation step is started before the step of adding the first liquid into the target container 1, and the irradiation step is continuously performed during the process of performing the step of adding the first liquid and performing the step of irradiating the second liquid to detect whether the first liquid and the second liquid are normally added to the target container.

[0066] In addition, as a preferred method, the irradiation step can also be started after each liquid injection is completed and before the next liquid injection. Starting the irradiation step at this time can make the liquid surface in the target container 1 be in a basically horizontal and stable state when irradiated by the light source 3 when the irradiation step is initially started, so that the detection of the light intensity value is less disturbed by the dynamic changes of the liquid injection, such as the flow or dripping of the liquid, so that the change in the light intensity value can be accurately detected when the next liquid injection starts, ensuring that when the next liquid injection starts, the information on whether the next liquid injection is started as scheduled can be accurately obtained.

[0067] Of course, the irradiation step can also be started at the time when each liquid filling is about to be completed, so as to minimize the interference of dynamic changes in the main process of the liquid filling, and also achieve the effect of accurately and effectively detecting the light intensity value. Of course, during the liquid filling process, the irradiation step and the detection step are always maintained, that is, the light source 3 is always kept irradiating the target container 1 and the detection of the light passing through the target container 1 is always maintained, and the present invention can also be implemented in the same way.

[0068] More preferably, in the liquid feeding step, after each liquid feeding, the liquid in the target container 1 is mixed, and then the mixed liquid in the target container 1 is irradiated and detected to enhance the accuracy of the light intensity value detection of the liquid in the target container 1. This preferred mixing step is particularly suitable for the case where the transmittance of the liquid before the liquid feeding and the mixed liquid after the liquid feeding changes greatly, and the light intensity value of the liquid before and after the mixing can be compared to detect whether the liquid has been fed according to the predetermined setting.

[0069] The prescribed interval range irradiated by the light source 3 is set to at least cover the liquid level position corresponding to the predetermined addition amount of the first liquid. The addition process of the first liquid, including whether the predetermined addition amount is reached, will be effectively detected by the change in the light intensity value. The prescribed interval range irradiated by the light source 3 is set to at least cover the liquid level position corresponding to the sum of the predetermined addition amounts of the first liquid and the second liquid. When the second liquid is added on the basis of the first liquid, the addition process of the second liquid, including whether the predetermined addition amount is reached, will also be detected by the change in the light intensity value. Moreover, because the liquid level is still within the prescribed interval range irradiated by the light source 3 after the first liquid and the second liquid are added, when other liquids are added on this basis, whether the liquid level rises can still be detected by the change in the light intensity value. The prescribed interval range irradiated by the light source 3 is set in this way, so that when adding multiple liquids to the target container 1, it can be ensured that any liquid can be detected if it fails to complete the liquid addition according to the predetermined setting. In this embodiment, the first liquid and the second liquid are used as examples, but the types of liquids are not limited to this. When there are more types of liquids, the prescribed interval range irradiated by the light source 3 is set to be greater than or equal to the sum of the predetermined addition amounts of all liquids.

[0070] In addition, in this embodiment, if there is not enough first liquid in the liquid storage tank, so that after the first liquid is added, the liquid in the target container 1 is not within the specified interval of the light source 3 and cannot be detected, or although it is within the specified interval of the light source 3, the light intensity value changes slightly and cannot be sensed by the light intensity sensor 4. At this time, the light intensity value detected by the light intensity sensor 4 remains basically unchanged, so that the light intensity value change ΔI is zero or low, that is, lower than the threshold value I0, and a notification message can also be issued to inform the staff or related equipment that there is an abnormal liquid inlet.

[0071] Taking the height of the target container 1 as an example, the specified range of the irradiation of the light source 3 includes the lowest height at which the light source 3 can detect the liquid inflow behavior on the target container 1 by irradiation, and the highest height at which the light source 3 can detect the liquid inflow behavior on the target container 1 by irradiation. The predetermined addition amount can be converted into the height of the liquid column in the target container 1 after a certain volume of liquid is added to the target container 1.

[0072] As mentioned above, the change ΔI of the light intensity value in the present embodiment also includes the rate of change of the time factor, which is explained below by an example. In the actual liquid feeding process, the time of each step is segmented. For example, the first liquid is added in the time period t1, and the light intensity value I1 of the light received by the light intensity sensor 4 in the time period t3 is obtained. Then, the second liquid is added in the time period t4, and the light intensity value I2 of the light received by the light intensity sensor 4 in the time period t5 is obtained. The change ΔI of the light intensity value between the light intensity value I1 and the light intensity value I2 is compared with the preset threshold value I0. The time lengths of each time period t1, t2, t3, t4, t5, and t6 here can be the same or different. The light intensity value can be the average value of the time period t3 and the time period t6, or the instantaneous value of a certain time in the time period t3 and the time period t6.

[0073] The above description of the time factor is only an example, and the setting of the time period is not limited thereto. As long as the light intensity value change ΔI during the liquid injection process or before and after the liquid injection can be accurately reflected, the present invention can be implemented.

[0074] As a preferred embodiment, during the liquid feeding process, the liquids fed can be multiple, for example, three. In this case, after the second liquid is added, Figure 3As shown, it also includes at least one step of adding a third liquid. During the process of adding the third liquid, the irradiation step and the detection step are repeated to detect whether the third liquid is actually added according to the predetermined amount. Among them, the predetermined amount of the first liquid is set to be greater than the predetermined amount of the second liquid or the third liquid, that is, the liquid with the largest predetermined amount is used as the first liquid and is first added to the target container 1. Adding the first liquid with a larger predetermined amount first can quickly raise the liquid level in the target container 1 to the specified height interval irradiated by the light source 3, so that it is within the measurable range of the light intensity value. The second liquid and the third liquid with a smaller predetermined amount are added later, and the amount of liquid level rise they can bring is smaller, so that even if the specified interval range irradiated by the light source 3, that is, the height interval range irradiated by the light source 3 is narrow, after the second liquid and the third liquid are added, the liquid level in the target container 1 can still be within the specified interval range irradiated by the light source 3, that is, at a position where the light source 3 emits stronger light, and the change in light intensity value caused by the slight change can be sensitively detected by the light intensity sensor 4. Therefore, there is no need to set an excessively large light source 3 to irradiate the specified interval range, and the miniaturization and convenience of the device have been achieved.

[0075] It should be noted that, generally, the first liquid can be a sewage sample liquid to be detected, and the second liquid, the third liquid, etc. can be various reaction reagents, or pure water, etc. The predetermined amount of the first liquid to be added is much larger than the sum of the predetermined amounts of the second liquid and the third liquid to be added, for example, the volume of the first liquid can be 10-50 times the sum of the volumes of the second liquid, the third liquid, etc.

[0076] In addition, if the liquid is added from the top of the target container 1, the liquid will block and interfere with the light emitted by the light source 3 during the falling process, thereby interfering with the measurement result of the light intensity sensor 4. Therefore, as a preferred embodiment of the present invention, the liquid is added from the bottom of the target container 1, which effectively avoids this problem. In this preferred embodiment, a variety of liquids are added to the target container 1 successively through the through hole 11 opened at the bottom of the target container 1. Adding liquid from the bottom of the target container 1 can reduce the fluctuation of the liquid level in the target container 1, and also avoid the blocking and interference of the light caused by the liquid falling after adding liquid from the top, as well as the interference caused by the splashing of the dripping liquid surface, thereby improving the accuracy of the light intensity detection of the light intensity sensor 4, and then improving the accuracy of the judgment.

[0077] The target container 1 is a transparent container with a cylindrical side wall. This structure can strengthen the refraction of the light emitted by the light source 3 at the interface of the side wall, so that the change of the liquid level can cause a more obvious change in light intensity, and improve the detection sensitivity of the light intensity sensor 4 to the change of the liquid level. In addition, the part of the target container 1 corresponding to the light source 3 and the light intensity sensor 4 can also be a transparent structure, and the other parts can be opaque or translucent. The present invention can also be implemented in the same way.

[0078] In a preferred embodiment, the light source 3 may be a long strip light source 3 extending in the same direction as the target container 1 in the direction of the liquid level change, see Figure 4 As shown, the light emitted by the light source 3 is parallel light with a certain width in the direction of the liquid level change. After the parallel light penetrates the target container 1, the range received by the light intensity sensor 4 covers the liquid level after the first liquid is filled with a predetermined amount, the liquid level after the second liquid is filled with a predetermined amount, and the liquid level after the third liquid is filled with a predetermined amount. Therefore, whether each of the first liquid, the second liquid, and the third liquid is injected, whether the injection process and the liquid level change, and whether the light intensity value changes, can all be detected by the light intensity sensor 4 to ensure that the actual injection status of each liquid is under monitoring and control.

[0079] As a preferred embodiment of the present invention, the light source 3 may also be Figure 5 and Figure 6 When a divergent light source is used as the light source 3, on the one hand, the irradiable range of the light source 3 can cover more parts of the target container 1. On the other hand, as a point light source, the directions of the rays emitted by the divergent light source are different. Relative to the target container 1 with a cylindrical side wall, the incident angles of the rays at the interface are also different, so the resulting refraction changes are more complex and diverse. The complex and diverse refraction changes can be more sensitive to liquid level changes, making it easier for slight changes in the liquid level to be detected by the light intensity sensor 4 as changes in light intensity, thereby further improving the detection sensitivity of the light intensity sensor 4 to liquid level changes.

[0080] See Figure 5 , a divergent light source is arranged as a point light source at the side of the target container 1, and irradiates toward the target container 1. Since the irradiation angles of the divergent light source relative to different parts of the target container 1 and the liquid therein are different, the larger the angle between the irradiated light and the height direction of the target container 1, the smaller the deflection of the light emitted after penetrating the target container 1, and the smaller the angle between the irradiated light and the height direction of the container, the larger the deflection of the light emitted after penetrating the target container 1. In this way, using a divergent light source, a slight change in the liquid level (liquid surface) can bring about a large change in the light intensity of the light penetrating the target container 1, so that a slight change in the liquid level (liquid surface) can be sensitively detected, making the change in the light intensity value detected by the light intensity sensor 4 more obvious, thereby improving the detection sensitivity of the light intensity sensor 4 to the change in the liquid level (liquid surface).

[0081] Implementation Method 2

[0082] The second embodiment of the present invention provides a liquid collection device and a water quality analyzer, which have the target container 1 in the first embodiment. The parts not specially explained include the figure marks and text descriptions, which are the same as those in the first embodiment and will not be repeated here.

[0083] In a second embodiment of the present invention, Figure 7 From the perspective of the present invention, the liquid collection device includes a target container 1, a liquid inlet device 2, a light source 3 as an irradiation device, a light intensity sensor 4 as a detection device, and a notification device 5. On this basis, this embodiment provides a water quality analyzer, including the above-mentioned liquid collection device, and the target container 1 in this embodiment is used as a reaction pool of the water quality analyzer. Specifically, in the water quality analyzer, the sewage sample liquid to be detected and the reagent or pure water liquid that reacts with the sample liquid are mixed and reacted in the target container 1, and then the various parameters of the mixed liquid in the target container 1 are detected.

[0084] The liquid inlet device 2 is used to input liquid into the target container 1, and at least comprises a multi-way valve 21 (preferably an eight-way valve) and a liquid infusion tube 22, the two ends of which are respectively connected to the multi-way valve 21 and at least one external liquid container 6 ( Figure 7 As an example, only one liquid container 6 is shown in the figure to pass the liquids in different liquid containers 6 into the target container 1.

[0085] The light source 3 is an irradiation device, which is arranged on one side of the target container 1 to irradiate a specified range of the target container 1. The detection device includes a light intensity sensor 4 arranged on the other side of the target container 1. The light intensity sensor 4 is opposite to the light source 3 across the target container 1, receives the light passing through the target container 1 and detects the light intensity value. The notification device 5 can be a display screen with a control unit, which calculates, analyzes and displays the change in light intensity value during the process of the liquid inlet device 2 inputting liquid into the target container 1, and sends out, for example, graphic notification information when the change ΔI of the light intensity value is less than the threshold value I0. The notification device 5 can also be a voice player with a control unit or a communication device that sends notification information to the server or PC.

[0086] This embodiment uses the target container 1 as a reaction pool, and inputs liquid into the target container 1 through the liquid inlet device 2. When the target container 1 is filled with liquid, the light source 3 and the light intensity sensor 4 are arranged on both sides of the target container 1 to monitor the liquid inlet of the target container 1 in a non-contact manner. On the one hand, there will be no contact contamination of the liquid in the target container 1. On the other hand, during the liquid inlet process, the rise of the liquid level (liquid surface) within the specified interval in the target container 1 can be sensitively reflected by the change in the light intensity value ΔI. When the liquid level (liquid surface) does not rise, the light intensity value measured by the light intensity sensor 4 can maintain a relatively stable state, so that the execution of the liquid inlet can be judged based on the comparison between the change in the light intensity value ΔI and the threshold value I0, and the liquid inlet monitoring can be completed sensitively and stably.

[0087] In addition, according to the Lambert-Beer law, the light intensity value measured by the light intensity sensor 4 can also be used as a measurement value reflecting the concentration of a specific component of the liquid in the target container 1. Through this arrangement, the combination of the irradiation device and the light intensity sensor 4 can, on the one hand, determine whether the target container 1 is filled with liquid according to the predetermined liquid filling arrangement, and on the other hand, can also have the function of detecting the concentration of the liquid, thereby reducing the equipment cost and improving the integration of the equipment.

[0088] The target container 1 is preferably a transparent container with a cylindrical side wall. The cylindrical side wall can enhance the refraction of the light emitted by the light source 3 at the interface of the side wall, so that the change of the liquid level (liquid surface) can cause a more obvious change in light intensity, thereby improving the detection sensitivity of the light intensity sensor 4 to the change of the liquid level (liquid surface).

[0089] Preferably, the irradiation device is a divergent light source, and the light emitted by the divergent light source is evenly distributed from one point to all directions in space, and irradiates the target container 1. Since the irradiation angles of the divergent light source relative to the target container 1 and the liquid therein are different, it can bring about complex and diverse refraction changes of the light, causing the change of the liquid level (liquid surface) in the target container 1 to cause more obvious changes in light intensity, thereby further improving the detection sensitivity of the light intensity sensor 4 to the liquid level change.

[0090] A through hole 11 is also provided at the bottom of the target container 1, and liquid is added into the target container 1 through the through hole 11. Adding liquid from the bottom can reduce the violent fluctuation of the liquid level in the target container 1, and also avoid the situation that when adding liquid from the top, the liquid blocks or interferes with the measurement light path of the light intensity sensor 4 during the falling process, thereby improving the accuracy of light intensity detection of the light intensity sensor 4.

[0091] In this embodiment, they will not be described one by one, but various situations in the first embodiment can be applied to the liquid collection device and water quality analyzer of this embodiment, and can also realize the present invention.

[0092] Those skilled in the art will appreciate that, in the above-mentioned embodiments, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the above-mentioned embodiments, the technical solutions claimed for protection in the claims of the present application can be basically realized. Therefore, in practical applications, various changes can be made to the above-mentioned embodiments in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A method for determining whether liquid is being introduced into a target container, for determining whether liquid is being introduced into the target container, characterized in that: The determination method comprises the following steps: A liquid feeding step, feeding liquid into the target container; an irradiation step, wherein a light source disposed on one side of the target container is directed toward the target container to irradiate a predetermined interval along the rising direction of the liquid level, wherein the light source is a divergent light source, and the target container is a transparent container having a cylindrical side wall, and the divergent light source is adjacent to the cylindrical side wall; A detection step, detecting the light intensity value transmitted through the target container by means of a light intensity sensor disposed opposite to the light source across the target container; A notification step, if the change in the light intensity value is less than a threshold value in the liquid feeding step, a notification message is issued, and the liquid feeding step also includes: A first liquid adding step, adding the first liquid into the target container; Adding a second liquid step, after the adding the first liquid step is completed, adding the second liquid to the target container, The prescribed interval range irradiated by the light source at least covers a liquid level position corresponding to a predetermined addition amount of the first liquid and a liquid level position corresponding to a sum of predetermined addition amounts of the first liquid and the second liquid.

2. The method for determining whether a target container has liquid inflow according to claim 1, characterized in that: After the step of adding the second liquid, at least one step of adding the third liquid is further included, wherein: The predetermined amount of the first liquid to be added is greater than the predetermined amount of the second liquid or the third liquid to be added.

3. The method for determining whether a target container has liquid inflow according to claim 1, characterized in that: The plurality of liquids are added into the target container via the through holes opened at the bottom of the target container.

4. A liquid extraction device, characterized in that: include: target container; A liquid inlet device, which adds a first liquid into the target container, and after the first liquid is added, adds a second liquid into the target container; an irradiation device, disposed on one side of the target container, facing the target container, irradiating a specified interval range along the rising direction of the liquid level, wherein the target container is a transparent container with a cylindrical side wall, and the irradiation device is a divergent light source, and the divergent light source is adjacent to the cylindrical side wall; A detection device, comprising a light intensity sensor disposed opposite to the irradiation device across the target container, for detecting a light intensity value passing through the target container; a notification device, which sends a notification message if the change in the light intensity value is less than a threshold value during the process of the liquid inlet device feeding the liquid into the target container, The prescribed interval range irradiated by the irradiation device at least covers the liquid level position corresponding to the predetermined addition amount of the first liquid and the liquid level position corresponding to the sum of the predetermined addition amounts of the first liquid and the second liquid.

5. The liquid extraction device according to claim 4, characterized in that: A through hole is provided at the bottom of the target container, and the liquid is added into the target container via the through hole.

6. A water quality analyzer, characterized in that: The water quality analyzer comprises the liquid collection device as claimed in claim 4.

7. The water quality analyzer according to claim 6, characterized in that: The target container is the reaction pool of the water quality analyzer.

Images