CN115575187A - Feed liquor compensation control system of water quality analyzer - Google Patents
Feed liquor compensation control system of water quality analyzer Download PDFInfo
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- CN115575187A CN115575187A CN202211220857.5A CN202211220857A CN115575187A CN 115575187 A CN115575187 A CN 115575187A CN 202211220857 A CN202211220857 A CN 202211220857A CN 115575187 A CN115575187 A CN 115575187A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention relates to the technical field of water quality detection, and particularly discloses a liquid inlet compensation control system of a water quality analyzer, which comprises: the water quality analysis module is used for detecting pollutants in a water sample; the liquid inlet control module comprises a sampling unit and a control valve; the sampling unit is used for extracting a water sample and discharging the water sample at a constant pressure; the control valve is arranged at the liquid outlet end of the sampling unit and is used for controlling the communication between the sampling unit and the water quality analysis module; the liquid inlet detection module is arranged on a pipeline communicated between the sampling unit and the control valve and is used for detecting the vacant condition of a water sample in the pipeline; and the processing module is used for controlling the connection between the sampling unit and the water quality analysis module through the control valve when the water sample vacancy condition meets the preset condition, and compensating the liquid discharge amount of the sampling unit according to the real-time water sample vacancy condition. The invention can reduce the waste of reagents and the wastewater treatment capacity and ensure the accuracy of the detection result.
Description
Technical Field
The invention relates to the technical field of liquid inlet control of a water quality analyzer, in particular to a liquid inlet compensation control system of the water quality analyzer.
Background
Along with continuously promoting environmental water quality attention degree, the instrument demand that can carry out water quality analysis and detection fast is higher and higher, wherein, utilize the mode of optical detection, set temperature, set pressure's environment under, carry out the mixing reaction to sample and reagent, then shine the mixed appearance after the reaction with a monochromatic light source, the mixed water sample can have certain absorption to this monochromatic light, according to Lambert beer's law this monochromatic light absorbed quantity and the water sample heavy pollutant concentration that awaits measuring directly proportional, consequently, the pollution situation of light absorbed quantity to quality of water single factor through detecting analyzes, and then can realize the detection to water pollution.
The liquid inlet quantity of an existing liquid quality analyzer liquid inlet system is controlled by controlling the flow rate and time of liquid in the liquid inlet process, and meanwhile, due to the fact that bubbles exist in the liquid inlet process, the existing liquid inlet control system can adopt a mode of 'pinching the head and removing the tail', liquid at the beginning part and the part to be finished of liquid inlet is removed, and the influence of the bubbles on the liquid inlet quantity is reduced.
Because the number of the bubbles is different in different scenes, the time period of the 'pinching head' is set to be too short, the bubbles still exist to influence the actual liquid inlet amount, and further the detection accuracy is influenced; if the time period of the 'pinching' is set to be too long, the using amount of the reagent is increased, and meanwhile, the treatment amount of the wastewater is increased; in addition, even if the time period of 'pinching the head' meets the requirement, bubbles may still exist in the detection process to influence the actual liquid inlet amount, so that the detection accuracy is influenced.
Disclosure of Invention
The invention aims to provide a liquid inlet compensation control system of a water quality analyzer, which solves the following technical problems:
how to reduce the influence of bubbles in water samples and reagents on the detection accuracy.
The purpose of the invention can be realized by the following technical scheme:
a feed liquid compensation control system of a water quality analyzer, the control system comprises:
the water quality analysis module is used for detecting pollutants in a water sample;
the liquid inlet control module comprises a sampling unit and a control valve; the sampling unit is used for extracting a water sample and discharging the water sample at a constant pressure; the control valve is arranged at the liquid outlet end of the sampling unit and is used for controlling the communication between the sampling unit and the water quality analysis module;
the liquid inlet detection module is arranged on a pipeline communicated between the sampling unit and the control valve and is used for detecting the vacant condition of a water sample in the pipeline;
and the processing module is used for controlling the connection between the sampling unit and the water quality analysis module through the control valve when the water sample vacancy condition meets the preset condition, and compensating the liquid discharge amount of the sampling unit according to the real-time water sample vacancy condition.
In one embodiment of the invention, the water sample vacancy condition is the number of bubbles in the pipeline and the duration of the bubbles.
In one embodiment of the present invention, the preset condition is a feed liquid bubble stabilization value S value Less than or equal to a preset threshold value;
the bubble stability value of the liquid inlet
Wherein n is the current time pointNumber of bubbles, t, of the preceding specific period 0 The time length of a specific time interval before the current time point is t, and the time length of the bubble in the detection state in the specific time interval is t.
In an embodiment of the present invention, the process of compensating by the processing module is as follows:
in the process that the sampling unit feeds liquid into the water quality analysis module, acquiring the quantity of bubbles and the duration of the bubbles;
by the formula V com ＝n x *V 0 +n y *V t *t y Calculating the compensation V in the liquid inlet process com ；
By the formula V set ＝V t *t z Calculating the set liquid inlet amount V in the liquid inlet process set ；
Controlling the liquid inlet quantity at each time to be V set +V com ；
Wherein n is x The number of the duration time is less than or equal to the set threshold value; v 0 The duration is less than or equal to the liquid inlet amount corresponding to the set threshold value bubbles; n is a radical of an alkyl radical y The number of the duration time is greater than the set threshold value; v t The liquid inlet amount is unit time length; t is t y The average duration of the bubbles with the duration longer than the set threshold value is set; t is t y To set the total duration of the feed process.
In one embodiment of the invention, the sampling unit comprises a pump body, the pump body is communicated with a sampling pipe, the sampling pipe is communicated with a multi-way valve, and the multi-way valve is respectively communicated with a water sample, a standard liquid and deionized water; the sampling pipe is provided with a high liquid level detection assembly and a low liquid level detection assembly;
and the running state of the pump body is checked through the high liquid level detection assembly and the low liquid level detection assembly.
In an embodiment of the present invention, the checking process is as follows:
when the detection result of the high liquid level detection assembly changes, recording the time point t 1 ；
When the detection result of the low liquid level detection assembly changes, recording the time point t 2 ；
By the formula Δ t = t 2 -t 1 Calculating a detection time difference delta t;
the detection time difference delta t and the preset standard deviation delta t are compared h And deviation t pt And (3) carrying out comparison:
if | Δ t- Δ t h |≥t pt Judging that the speed of the pump body is abnormal;
otherwise, judging that the speed of the pump body is normal.
In one embodiment of the invention, the sampling unit stops sampling when the liquid level of the sampling pipe reaches the position of the high liquid level detection assembly during sampling;
and in the liquid discharging process of the sampling unit, the sampling standard speed of the pump body is adjusted according to the actual liquid discharging amount of the sampling unit and the liquid inlet amount of the water quality analysis module.
In one embodiment of the present invention, the pump sampling standard speed is adjusted by:
obtaining the liquid discharge volume V according to the current set speed and the working time of the pump body e ；
Obtaining the stable value S of the liquid inlet bubble value Liquid inlet quantity V detected by water quality analysis module under state of less than or equal to preset threshold value d ；
By the formula Δ V = V e -V d Calculating a liquid discharge difference value delta V, and comparing the liquid discharge difference value delta V with a preset difference value delta V th And (3) carrying out comparison:
if Δ V is not less than Δ V th Reducing the sampling standard speed of the pump body;
otherwise, keeping the sampling standard speed of the current pump body.
The invention has the beneficial effects that:
(1) According to the invention, the condition of bubbles in the liquid inlet process is compared with the preset condition, so that whether the discharge of a water sample or a reagent with more bubbles is finished or not can be judged, the time point of liquid flowing into the water quality analysis module is controlled according to the preset condition, and the waste of the reagent and the wastewater treatment capacity are reduced; carry out real-time detection to the bubble through feed liquor detection module, calculate the offset according to the result that detects, consequently carry out the analysis of quality of water according to the feed liquor volume after the compensation, can guarantee that water sample and relevant reagent are in the within range of standard, have guaranteed the accuracy of testing result.
(2) According to the invention, the working operation state of the pump body can be judged by detecting the liquid level through the high liquid level detection assembly and the low liquid level detection assembly, and the pump body can be timely adjusted according to the detection result.
(3) According to the invention, the actual liquid discharge amount of the sampling unit is compared with the liquid inlet amount of the water quality analysis module, so that whether the set sampling standard speed of the pump body is too high can be judged, and the detection is prevented from being influenced by excessive bubbles generated at a higher sampling standard speed on the basis of ensuring the detection efficiency by adjusting the sampling standard speed of the pump body.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of an inlet compensation control system in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of an inlet compensation control system in another embodiment of the invention.
Reference numerals: 1. a water quality analysis module; 2. a liquid inlet control module; 21. a sampling unit; 211. a pump body; 212. a sampling tube; 213. a multi-way valve; 214. a high liquid level detection assembly; 215. a low level detection assembly; 22. a control valve; 3. and a liquid inlet detection module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in one embodiment, there is provided a feed-liquid compensation control system for a water quality analyzer, the control system comprising:
the water quality analysis module 1 is used for detecting pollutants in a water sample;
the liquid inlet control module 2 comprises a sampling unit 21 and a control valve 22; the sampling unit 21 is used for extracting water samples and discharging the water samples at a constant pressure; the control valve 22 is arranged at the liquid outlet end of the sampling unit 21 and is used for controlling the communication between the sampling unit 21 and the water quality analysis module 1;
the liquid inlet detection module 3 is arranged on a pipeline communicated between the sampling unit 21 and the control valve 22 and is used for detecting the vacant condition of a water sample in the pipeline;
and the processing module is used for controlling the communication between the sampling unit 21 and the water quality analysis module 1 through the control valve 22 when the water sample vacancy condition accords with the preset condition, and compensating the liquid discharge amount of the sampling unit 21 according to the real-time water sample vacancy condition.
According to the technical scheme, the liquid inlet detection module 3 is arranged to detect the vacancy condition of the water sample in the pipeline, wherein the vacancy condition of the water sample is the bubble condition existing in bubbles in the pipeline, so that the bubble condition in the liquid inlet process is compared with a preset condition, whether the water sample or the reagent with more bubbles is discharged or not can be judged, the time point of liquid flowing into the water quality analysis module 1 is controlled according to the preset condition, and the waste of the reagent and the wastewater treatment capacity are reduced; in addition, in order to avoid the influence of the bubbles on the water sample amount and the reagent amount in the liquid pumping process, the liquid inlet detection module 3 is used for detecting the bubbles in real time, and the compensation amount is calculated according to the detection result, so that the water quality is analyzed according to the compensated liquid inlet amount, the water sample and related reagents can be ensured to be in a standard range, and the accuracy of the detection result is ensured.
In the above technical scheme, when the pump body 211 is selected as the plunger pump, the process of pumping liquid can be directly realized through the plunger pump; the specific structure of the water quality analysis module 1 comprises a high-temperature digestion tank, a light source transmitting end, a light source receiving end, a high-pressure valve and the like, and the specific detection principle is not detailed herein; in addition, in the embodiment, the liquid pipeline is a transparent pipeline, and the detection of the liquid inlet detection module 3 on the bubbles can be realized by a conventional optical detection element, which is not described in detail herein.
As an embodiment of the invention, the water sample vacancy condition is the number of bubbles appearing in the pipeline and the duration of the bubbles.
Through the technical scheme, the water sample control condition is judged by utilizing the quantity and the duration of the bubbles, wherein the duration of the bubbles represents the size of a single bubble, and therefore, the quantity and the duration of the bubbles are used as monitoring data, so that the vacancy condition of the water sample can be accurately analyzed and judged.
As an embodiment of the present invention, the preset condition is a feed liquid bubble stability value S value Less than or equal to a preset threshold value;
the bubble stability value of the feed liquid
Wherein n is the number of bubbles in a specific time period before the current time point, t 0 The time length of a specific time interval before the current time point is t, and the time length of the bubble in the detection state in the specific time interval is t.
Through the technical scheme, the embodiment judges whether the current bubble state accords with the preset condition of feeding liquid into the water quality analysis module 1 according to the number and duration of the bubbles, and particularly, the preset condition is judged through a formula
Determining the bubble stability value S of the feed liquid value When the bubble stability value S of the feed liquid value When the liquid is larger, the empty state of the liquid is poor, and the bubble stability value S of the liquid inlet is further increased value When the liquid inlet amount is less than or equal to the preset threshold value, liquid is allowed to enter the water quality analysis module 1, and the accuracy of liquid inlet amount control judgment is further ensured.
In the above technical scheme, the liquid inlet bubble stabilizing value S value The predetermined threshold for comparison is selectively set based on the results of the multiple sets of test data calculations, which represent a reasonable range of standard values.
As an embodiment of the present invention, the process of compensating by the processing module is as follows:
in the process that the sampling unit 21 feeds liquid into the water quality analysis module 1, acquiring the quantity of bubbles and the duration of the bubbles;
by the formula V com ＝n x *V 0 +n y *V t *t y Calculating the compensation V in the liquid inlet process com ；
By the formula V set ＝V t *t z Calculating the set liquid inlet amount V in the liquid inlet process set ；
Controlling the liquid inlet quantity at each time to be V set +V com ；
Wherein n is x The number of the duration time is less than or equal to the set threshold value; v 0 The duration is less than or equal to the liquid inlet amount corresponding to the set threshold value bubbles; n is y The number of the duration time is greater than the set threshold value; v t The liquid inlet amount is unit time length; t is t y The duration is greater than the average duration of the set threshold value bubbles; t is t y To set the total duration of the feed process.
Through the technical scheme, the embodiment provides a concrete scheme for compensating the liquid inlet amount, firstly, in the process of feeding liquid into the water quality analysis module 1 from the sampling unit 21, the quantity of bubbles and the duration of the bubbles are obtained, and then the quantity and the duration of the bubbles are obtained through a formula V com ＝n x *V 0 +n y *V t *t y Calculating the compensation V in the liquid inlet process com Then by formula V set ＝V t *t z Calculating the set liquid inlet amount V in the liquid inlet process set Obviously, at a set V set When the sample is fed into the water quality analyzing module 1, the amount of liquid actually entering the water quality analyzing module 1 is small due to the influence of the air bubbles, and therefore, the liquid passes through V com And (5) compensating, and further ensuring the accuracy of the actual liquid inlet quantity.
It should be noted that, the liquid inlet amount is controlled to be V each time set +V com In the meantime, the liquid inlet amount is the detected liquid inlet amount, and thus the amount and V actually entering the water quality analysis module 1 set The values are the same.
The related explanation of the formula is that the bubbles are generally small bubbles or large bubblesThe bubble, when the small bubble, directly calculate the volume that the bubble occupy according to the quantity of bubble, and when the bubble is great, through the length of time that the bubble lasts in feed liquor detection module 3 positions, calculate the volume of bubble, through formula V com ＝n x *V 0 +n y *V t *t y The calculation mode of (2) can realize calculating the total volume occupied by the bubbles in the liquid, and further obtain the liquid compensation quantity.
As an embodiment of the present invention, please refer to fig. 2, the sampling unit 21 includes a pump body 211, the pump body 211 is connected to a sampling pipe 212, the sampling pipe 212 is connected to a multi-way valve 213, and the multi-way valve 213 is respectively connected to a water sample, a standard solution, and deionized water; the sampling pipe 212 is provided with a high liquid level detection component 214 and a low liquid level detection component 215;
the operating status of the pump body 211 is checked by the high level detection assembly 214 and the low level detection assembly 215.
Through the above technical solution, the sampling unit 21 in this embodiment pumps liquid through the pump body 211 and the sampling tube 212, the pump body 211 is realized through the structure of the peristaltic pump in the prior art, and the process of pumping different liquids is realized through the control of the multi-way valve 213; in addition, this embodiment is provided with high liquid level determine module 214 and low liquid level determine module 215 on sampling pipe 212, through the detection of high liquid level determine module 214 and low liquid level determine module 215 to the liquid level, and then can judge the work running state of pump body 211, and then in time adjust pump body 211 according to the testing result.
It should be noted that, when the pump body 211 is selected as a plunger pump, a liquid pumping process can be directly realized by the plunger pump, and when the pump body 211 is selected as a peristaltic pump, a quantitative liquid pumping process needs to be realized by matching the sampling tube 212, the high liquid level detection assembly 214, and the low liquid level detection assembly 215, but in this embodiment, the operating state of the peristaltic pump is judged based on a structure in which the peristaltic pump is matched with the sampling tube 212, the high liquid level detection assembly 214, and the low liquid level detection assembly 215.
As an embodiment of the present invention, the checking process is:
when the detection result of the high liquid level detection component 214 changes, the time point t is recorded 1 ；
When the detection result of the low liquid level detection component 215 changes, the time point t is recorded 2 ；
By the formula Δ t = t 2 -t 1 Calculating a detection time difference delta t;
the detection time difference delta t and the preset standard deviation delta t are compared h And deviation t pt And (3) carrying out comparison:
if | Δ t- Δ t h |≥t pt If yes, judging that the speed of the pump body 211 is abnormal;
otherwise, the pump body 211 is judged to have normal speed.
Through the technical scheme, the speed of the pump body 211 is judged according to the speed of liquid change, specifically, when the detection result of the high liquid level detection assembly 214 changes, the time point t is recorded 1 (ii) a When the detection result of the low liquid level detection component 215 changes, the time point t is recorded 2 (ii) a Calculating the detection time difference delta t by detecting the time difference delta t and the preset standard deviation delta t h And comparing to judge whether the speed of the pump body 211 is normal or not, so as to judge the running state of the pump body 211.
In the above technical scheme, the time difference Δ t and the deviation t are detected pt Are obtained according to the performance selectivity setting measured by the pump body 211.
As an embodiment of the present invention, the sampling unit 21 stops sampling when the liquid level of the sampling pipe 212 reaches the position of the high liquid level detection assembly 214 during sampling;
in the liquid discharging process of the sampling unit 21, the sampling standard speed of the pump body 211 is adjusted according to the actual liquid discharging amount of the sampling unit 21 and the liquid inlet amount of the water quality analysis module 1.
When the liquid pumping speed of the pump body 211 is too fast, easily make the liquid of taking out produce more bubbles, and if the speed of drawing liquid is slower, then can influence the efficiency that detects whole completion, therefore, this embodiment is compared through the actual discharge capacity of sampling unit 21 and the feed liquor volume of water quality analysis module 1, and then can judge whether setting for pump body 211 sampling standard speed is too high, through the adjustment to pump body 211 sampling standard speed, and then can be on the basis of guaranteeing detection efficiency, avoid faster sampling standard speed to produce too much bubbles and influence the detection and go on.
It should be noted that, for different liquids and different environments, the stabilization rates of bubbles inside the liquid are different, and thus the way of setting the fixed time point cannot satisfy the requirements of different liquids and different environments.
In one embodiment of the present invention, the sampling standard speed of pump body 211 is adjusted by:
obtaining the discharge volume V according to the current set speed and working time of the pump body 211 e ；
Obtaining the stable value S of the liquid inlet bubble value Liquid inlet quantity V detected by the water quality analysis module 1 in a state less than or equal to a preset threshold value d ；
By the formula Δ V = V e -V d Calculating a liquid discharge difference value delta V, and comparing the liquid discharge difference value delta V with a preset difference value delta V th And (3) carrying out comparison:
if Δ V is not less than Δ V th Then the pump body 211 sampling standard speed is reduced;
otherwise, the current pump block 211 sample standard speed is maintained.
Through the technical scheme, the embodiment provides a concrete mode for adjusting the sampling standard speed of the pump body 211, and the liquid discharge amount V is obtained according to the current set speed and the working time of the pump body 211 e Obviously, the discharge volume V e For the amount of discharged liquid, and simultaneously obtaining a stable value S of liquid inlet bubbles value Liquid inlet quantity V detected by the water quality analysis module 1 in a state less than or equal to a preset threshold value d Obviously, the feed liquid quantity V is detected d For the amount of liquid entering the water quality analysis module 1, pass Δ V = V e -V d Furthermore, the amount of liquid Δ V that is discharged from the sampling unit 21 but does not flow into the water quality analysis module 1 can be calculated, and it is obvious that if Δ V is too large, the amount of liquid with bubbles is too large, that is, the amount of bubbles generated is too large, and therefore, if Δ V is not less than Δ V th The generation of bubbles is reduced by reducing the sampling standard speed of the pump body 211,so that the pump body 211 sample normal speed is maintained at a proper level.
In the above technical solution, the process of reducing the sampling standard speed of the pump body 211 is to reduce a speed value of a specific size; a predetermined difference value DeltaV th Obtained according to various test data of the actual detection process.
Although one embodiment of the present invention has been described in detail, the description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. The utility model provides a water quality analyzer feed liquor compensation control system which characterized in that, control system includes:
the water quality analysis module is used for detecting pollutants in a water sample;
the liquid inlet control module comprises a sampling unit and a control valve; the sampling unit is used for extracting a water sample and discharging the water sample at a constant pressure; the control valve is arranged at the liquid outlet end of the sampling unit and is used for controlling the communication between the sampling unit and the water quality analysis module;
the liquid inlet detection module is arranged on a pipeline communicated between the sampling unit and the control valve and is used for detecting the vacant condition of a water sample in the pipeline;
and the processing module is used for controlling the connection between the sampling unit and the water quality analysis module through the control valve when the water sample vacancy condition meets the preset condition, and compensating the liquid discharge amount of the sampling unit according to the real-time water sample vacancy condition.
2. The feed-in compensation control system of the water quality analyzer according to claim 1, wherein the empty condition of the water sample is the number of bubbles appearing in the pipeline and the duration of the bubbles.
3. The feed-liquid compensation control system of water quality analyzer according to claim 2, wherein the preset condition is a feed-liquid bubble stability value S value Less than or equal to a preset threshold value;
the bubble stability value of the liquid inlet
Wherein n is the number of bubbles in a specific time period before the current time point, t 0 The time length of a specific time interval before the current time point is t, and the time length of the bubble in the detection state in the specific time interval is t.
4. The feed-in compensation control system of the water quality analyzer according to claim 2, wherein the compensation process of the processing module is as follows:
in the process that the sampling unit feeds liquid into the water quality analysis module, acquiring the quantity of bubbles and the duration of the bubbles;
by the formula V com ＝n x *V 0 +n y *V t *t y Calculating the compensation V in the liquid inlet process com ；
By the formula V set ＝V t *t z Calculating the set liquid inlet amount V in the liquid inlet process set ；
Controlling the liquid inlet quantity at each time to be V set +V com ；
Wherein n is x The number of the duration time is less than or equal to the set threshold value; v 0 The duration is less than or equal to the liquid inlet amount corresponding to the set threshold value bubbles; n is a radical of an alkyl radical y The number of the duration time is greater than the set threshold value; v t The liquid inlet amount is unit time length; t is t y The duration is greater than the average duration of the set threshold value bubbles; t is t y To set the total duration of the feed process.
5. The liquid inlet compensation control system of the water quality analyzer according to claim 4, wherein the sampling unit comprises a pump body, the pump body is communicated with a sampling pipe, the sampling pipe is communicated with a multi-way valve, and the multi-way valve is respectively communicated with a water sample, a standard liquid and deionized water; the sampling pipe is provided with a high liquid level detection assembly and a low liquid level detection assembly;
and the running state of the pump body is checked through the high liquid level detection assembly and the low liquid level detection assembly.
6. The liquid feed compensation control system of the water quality analyzer according to claim 5, wherein the checking process comprises:
when the detection result of the high liquid level detection assembly changes, recording the time point t 1 ；
When the detection result of the low liquid level detection assembly changes, recording the time point t 2 ；
By the formula Δ t = t 2 -t 1 Calculating a detection time difference delta t;
the detection time difference delta t and the preset standard deviation delta t are compared h And deviation t pt And (3) carrying out comparison:
if | Δ t- Δ t h |≥t pt Judging that the speed of the pump body is abnormal;
otherwise, judging that the speed of the pump body is normal.
7. The liquid inlet compensation control system of the water quality analyzer according to claim 6, wherein the pump stops sampling when the liquid level of the sampling pipe reaches the position of the high liquid level detection assembly in the sampling process;
and in the liquid discharging process of the sampling unit, the sampling standard speed of the pump body is adjusted according to the actual liquid discharging amount of the sampling unit and the liquid inlet amount of the water quality analysis module.
8. The liquid quality analyzer liquid inlet compensation control system of claim 7, wherein the pump body sampling standard speed is adjusted in a manner that:
obtaining the liquid discharge volume V according to the current set speed and the working time of the pump body e ；
Obtaining the stable value S of the liquid inlet bubble value Liquid inlet quantity V detected by water quality analysis module under state of less than or equal to preset threshold value d ；
By the formula Δ V = V e -V d Calculating a liquid discharge difference value delta V, and comparing the liquid discharge difference value delta V with a preset difference value delta V th And (3) carrying out comparison:
if Δ V is not less than Δ V th Reducing the sampling standard speed of the pump body;
otherwise, keeping the sampling standard speed of the current pump body.
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