CN207667571U - A liquid mixing device - Google Patents

Abstract

This utility model discloses a liquid mixing device, including a solution mixing tank (1), a mixing tank inlet pipe (2), a first injection pump (4), a first inlet pipe (41), a first outlet pipe (42), a second injection pump (5), a second inlet pipe (51), a second outlet pipe (52), and an electromagnetic stirrer (7). First, the second injection pump (5) is controlled to inject the diluent into the mixing solution tank (1), and then the first injection pump (4) is controlled to inject the standard solution mother liquor into the mixing solution tank (1). After the standard solution mother liquor is injected, the second injection pump (5) continues to inject the diluent into the mixing solution tank (1). Once the diluent has been injected into the mixing solution tank (1), and the electromagnetic stirrer (7) has stirred the solution evenly, the electromagnetic stirrer (7) is turned off. This utility model has a high degree of automation and high solution mixing accuracy.

Description

A liquid mixing device

technical field

The utility model relates to a solution mixing design method, in particular to a solution mixing design in a calibration device of a water quality analyzer.

Background technique

In the environmental water body monitoring system, the online water quality analyzer is generally used to detect the water body parameters. Whether the detection accuracy of the online water quality analyzer meets the requirements of the national verification regulations, the measurement performance of the online water quality analyzer is generally calibrated manually, and the manual detection The time period of the online analyzer is long (typically 36 hours). How to set the mixing of the solutions in the calibration device of the water quality analyzer is a major factor affecting the preparation of the solution of the calibration device.

Utility model content

Purpose of the utility model: In order to overcome the deficiencies in the prior art, the utility model provides a liquid mixing device and a mixing method with high solution preparation precision.

Technical scheme: in order to achieve the above object, the technical scheme adopted in the utility model is:

A liquid mixing device, comprising a solution mixing tank (1), a mixing tank liquid inlet pipe (2), a first syringe pump (4), a first liquid inlet pipe (41), a first liquid outlet pipe (42), a first Two syringe pumps (5), a second liquid inlet pipe (51), a second liquid outlet pipe (52), and an electromagnetic stirrer (7), wherein:

The liquid inlet end of the first syringe pump (4) is used to connect with the standard mother solution bottle through the first liquid inlet pipe (41), and the liquid outlet end is connected with the solution mixing pool (1) through the first liquid outlet pipe (42) connected. The liquid inlet end of the second syringe pump (5) is used to connect with the diluent bottle through the second liquid inlet pipe (51), and the liquid outlet end is connected to the solution mixing tank (1) through the second liquid outlet pipe (52). connected. The mixed solution pool (1) comprises an open main tank body (11), a tank cover (12), and the tank cover (12) is used to cover the opening of the main tank body (11) to close the main tank body (11). Tank body (11). The bottom of the main tank body (11) is provided with a liquid inlet channel (111), a detection liquid outflow channel (112) and a liquid discharge channel (113).

Described electromagnetic stirrer (7) comprises electromagnet holder (71), electromagnet (72), stirrer (73), and described electromagnet holder (71) is used for electromagnet (72) is fixed on main groove The bottom of the body (11), and the stirring bar (73) is arranged in the inner cavity of the main tank body (11).

Further: it also includes a Y-shaped tee (3), and the Y-shaped tee (3) is a pipe fitting with two inlets and one outlet, which are respectively the first inlet pipe, the second inlet pipe and the first outlet pipe. One end of the liquid inlet pipe (2) of the mixing tank is connected with the first outlet pipe, and the other end is connected with the solution mixing tank (1). One end of the first liquid outlet pipe (42), the first liquid outlet one-way valve (44) and the first inlet pipe are connected in sequence, and the other end of the first liquid outlet pipe (42) is connected with the standard mother liquor bottle. Outlet connection. One end of the second liquid outlet pipe (52), the second liquid outlet one-way valve (54) and the second inlet pipe are connected in sequence, and the other end of the second liquid outlet pipe (52) is connected to the diluent bottle. Outlet connection. The connection between the first inlet pipe and the first liquid outlet pipe (42) is provided with a first liquid inlet check valve (43) to prevent liquid backflow, and the second inlet pipe and the second liquid outlet pipe ( 52) is provided with a second liquid inlet one-way valve (53) to prevent liquid backflow.

Preferably: the distance L from the closing port of the first liquid outlet check valve (44) to the outlet of the first inlet pipe is less than 4 times the pipe diameter R at the outlet end of the first liquid outlet check valve (44). The distance L from the closing port of the second liquid outlet check valve (54) to the outlet of the second inlet pipe is less than 4 times the pipe diameter R at the outlet end of the second liquid outlet check valve (54).

Preferably: the included angle between the first inlet pipe and the second inlet pipe is 45°.

Preferably: the liquid inlet of the liquid discharge channel (113) is located at the bottom of the inner chamber of the main tank body (11), and the liquid inlet of the liquid inlet channel (111) is higher than that of the detection liquid outflow channel (112). The liquid inlet, meanwhile, the liquid inlet of the liquid discharge channel (113) is lower than the liquid inlet of the detection liquid outflow channel (112), and the detection liquid outflow channel (112) is used for connecting sampling inspection equipment.

A solution mixing method, comprising the steps of:

Step 1, start the first syringe pump (4) to draw the standard solution mother solution from the standard mother solution bottle. Start the second syringe pump (5) to draw the diluent from the diluent bottle, and start the electromagnetic stirrer (7) to stir.

Step 2, first control the second syringe pump (5) to inject the diluent into the mixed solution pool (1), and then control the first syringe pump (4) to inject the standard solution mother solution into the mixed solution pool (1).

Step 3, when the standard solution mother solution is injected, continue to control the second syringe pump (5) to inject the diluent into the mixed solution pool (1).

Step 4, when it is easy to inject into the mixed solution pool (1), wait for the electromagnetic stirrer (7) to stir the solution evenly, and then turn off the electromagnetic stirrer (7).

Preferably: in step 3, continue to control the second syringe pump (5) to inject the diluent into the mixed solution pool (1) at least one-fifth of the diluent.

Compared with the prior art, the utility model has the following beneficial effects:

The utility model has higher automation degree and higher solution mixing precision.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is a schematic diagram of the principle of an automatic calibration device for an online water quality analyzer;

Fig. 3 is a schematic diagram of the workflow of the automatic calibration device of the water quality online analyzer;

Fig. 4 is the structural representation of solution mixing tank;

Fig. 5 is the three-dimensional schematic view of solution mixing tank;

Fig. 6 is a structural schematic diagram of an electromagnetic fixing seat;

Fig. 7 is a schematic diagram of the structure of the tank cover;

Fig. 8 is a structural schematic diagram of the tee.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, further illustrate the utility model, should be understood that these examples are only used for illustrating the utility model and are not intended to limit the scope of the utility model, after having read the utility model, those skilled in the art have a clear understanding of the utility model Modifications of various equivalent forms of the novelty all fall within the scope defined by the appended claims of the present application.

A liquid mixing device, as shown in Figure 1, comprising a solution mixing tank (1), a mixing tank inlet pipe (2), a first syringe pump (4), a first liquid inlet pipe (41), a first liquid outlet Pipe (42), second syringe pump (5), second liquid inlet pipe (51), second liquid outlet pipe (52), electromagnetic stirrer (7), wherein:

The liquid inlet end of the first syringe pump (4) is used to connect with the standard mother solution bottle through the first liquid inlet pipe (41), and the liquid outlet end is connected with the solution mixing pool (1) through the first liquid outlet pipe (42) connected. The liquid inlet end of the second syringe pump (5) is used to connect with the diluent bottle through the second liquid inlet pipe (51), and the liquid outlet end is connected to the solution mixing tank (1) through the second liquid outlet pipe (52). connected. The mixed solution pool (1) comprises an open main tank body (11), a tank cover (12), and the tank cover (12) is used to cover the opening of the main tank body (11) to close the main tank body (11). Tank body (11). The bottom of the main tank body (11) is provided with a liquid inlet channel (111), a detection liquid outflow channel (112) and a liquid discharge channel (113).

Described electromagnetic stirrer (7) comprises electromagnet holder (71), electromagnet (72), stirrer (73), and described electromagnet holder (71) is used for electromagnet (72) is fixed on main groove The bottom of the body (11), and the stirring bar (73) is arranged in the inner cavity of the main tank body (11).

It also includes a Y-shaped tee (3), and the Y-shaped tee (3) is a pipe fitting with two inlets and one outlet, which are respectively the first inlet pipe, the second inlet pipe and the first outlet pipe. One end of the liquid inlet pipe (2) of the mixing tank is connected with the first outlet pipe, and the other end is connected with the solution mixing tank (1). One end of the first liquid outlet pipe (42), the first liquid outlet one-way valve (44) and the first inlet pipe are connected in sequence, and the other end of the first liquid outlet pipe (42) is connected with the standard mother liquor bottle. Outlet connection. One end of the second liquid outlet pipe (52), the second liquid outlet one-way valve (54) and the second inlet pipe are connected in sequence, and the other end of the second liquid outlet pipe (52) is connected to the diluent bottle. Outlet connection. The connection between the first inlet pipe and the first liquid outlet pipe (42) is provided with a first liquid inlet check valve (43) to prevent liquid backflow, and the second inlet pipe and the second liquid outlet pipe ( 52) is provided with a second liquid inlet one-way valve (53) to prevent liquid backflow.

The purpose of setting the Y-shaped tee (3) is mainly to reduce the length of the pipeline between the first syringe pump (4), the second syringe pump (5) and the solution mixing tank (1), if the first syringe pump (4) 1. The second syringe pump (5) communicates with the solution mixing pool (1) with two pipelines respectively, which increases the dead volume in the pipeline and affects the configuration accuracy of the solution. Therefore, the utility model adopts a Y-type tee ( 3) The two pipelines are combined into one pipeline, which reduces the length of the pipeline, further reduces the dead volume in the pipeline, and improves the configuration accuracy of the solution.

The first liquid outlet check valve (44) has two purposes. The first one is to prevent the liquid from flowing back from the Y-shaped tee (3). When the distance L to the outlet of the first inlet pipe is less than 4 times the diameter R of the outlet end of the first liquid outlet check valve (44), the first liquid outlet check valve (44) and the outlet of the first inlet pipe form a turbulent flow structure. When the first liquid stops flowing into the liquid inlet pipe (2) of the mixing pool, there is the first liquid between the closing port of the first liquid outlet check valve (44) and the outlet of the first inlet pipe. When the second liquid continues to pass through the Y Type tee (3) flows into the liquid inlet pipe (2) of the mixing tank. Due to the angle between the first inlet pipe and the second inlet pipe, the second liquid flowing out from the second inlet pipe rushes to the first inlet pipe The outlet collides with the outlet of the first inlet pipe, and the second liquid after the collision forms a turbulent flow, agitating the solution in and around the outlet of the first inlet pipe and in the first liquid outlet check valve (44), and then enters the first outlet In the liquid one-way valve (44), when the turbulent flow reaches the closing port of the first liquid outlet one-way valve (44), due to the blocking of the closing port, the turbulent flow returns, and the return of the turbulent flow will cause the first liquid outlet one-way valve (44) to The solution is taken out, and then the exchange of the solution in the first liquid outlet check valve (44) is realized, that is, the first liquid that exists between the closed port of the first liquid outlet check valve (44) and the outlet of the first inlet pipe Through the action of turbulent flow, it is gradually diluted and brought out to avoid the influence of the residual liquid on the solution preparation, thereby improving the preparation accuracy of the solution. In the same way, the setting purpose of the second liquid outlet check valve (54) can be known.

The distance L from the closed port of the first liquid outlet check valve (44) to the outlet of the first inlet pipe is less than 4 times the pipe diameter R at the outlet end of the first liquid outlet check valve (44), and the second liquid outlet check valve (44) is The distance L from the closing port of the valve (54) to the outlet of the second inlet pipe is less than 4 times the pipe diameter R at the outlet end of the second liquid outlet check valve (54). The shorter the distance L from the closed mouth of the first liquid outlet check valve (44) to the outlet of the first inlet pipe, the better. The shorter the distance, the greater the turbulence effect, which can better resist the second liquid outlet check valve ( 54) Solution at the closure port. The Y-shaped tee (3) only needs to ensure that there is an angle between the first inlet pipe and the second inlet pipe. The best angle is 45°. It is made of PTEF material. The Y-shaped tee with a specific angle makes the calibration device The connecting lines should be as short as possible with as little dead volume as possible.

The distance L from the closing port of the first liquid outlet check valve (44) to the outlet of the first inlet pipe is less than 4 times the pipe diameter R at the outlet end of the first liquid outlet check valve (44). The distance L from the closing port of the second liquid outlet check valve (54) to the outlet of the second inlet pipe is less than 4 times the pipe diameter R at the outlet end of the second liquid outlet check valve (54). The shorter the distance L from the closed mouth of the first liquid outlet check valve (44) to the outlet of the first inlet pipe, the better. The shorter the distance, the greater the turbulence effect, which can better resist the second liquid outlet check valve ( 54) Solution at the closure port.

The liquid inlet of the liquid discharge channel (113) is located at the bottom of the inner cavity of the main tank body (11), and the liquid inlet of the liquid inlet channel (111) is higher than the liquid inlet of the detection liquid outflow channel (112) , while the liquid inlet of the liquid discharge channel (113) is lower than the liquid inlet of the test liquid outflow channel (112), and the test liquid outflow channel (112) is used for connecting sampling inspection equipment. The liquid inlet channel (111) is adopted to be arranged at the bottom of the inner cavity, so that the diluent and the standard mother liquor enter the mixed solution pool (1) from the bottom of the mixed solution pool (1), so that when the stirring bar 73 is prevented from rotating, the diluent and the standard mother liquor Flying on the inner wall of the mixed solution pool (1), affecting the mixing accuracy of the solution. In addition, when there is a solution in the mixing solution pool (1), the stirring bar starts to work to mix the test solution and speed up the mixing speed. The utility model adopts the solution to mix the pool from the bottom of the pool, and at the same time, the top is covered. This structure can reduce the influence of the evaporation of the solution and the phenomenon of solution hanging on the wall of the mixing pool on the preparation accuracy. Therefore, there is no need to stop stirring when sampling and injecting.

A solution mixing method, comprising the steps of:

Step 1, start the first syringe pump (4) to draw the standard solution mother solution from the standard mother solution bottle. Start the second syringe pump (5) to draw the diluent from the diluent bottle, and start the electromagnetic stirrer (7) to stir.

Step 2, first control the second syringe pump (5) to inject the diluent into the mixed solution pool (1), and then control the first syringe pump (4) to inject the standard solution mother solution into the mixed solution pool (1).

Step 3, when the standard solution mother solution is injected, continue to control the second syringe pump (5) to inject the diluent into the mixed solution pool (1). Continue to control the second syringe pump (5) to inject the diluent into the mixed solution pool (1) at least one-fifth of the diluent.

Step 4, when it is easy to inject into the mixed solution pool (1), wait for the electromagnetic stirrer (7) to stir the solution evenly, and then turn off the electromagnetic stirrer (7).

As shown in Figure 2-8, the utility model is used for the configuration of the solution in the automatic calibration device of the online water quality analyzer, and the automatic calibration device of the online water quality analyzer includes a host computer, a first control module A, and a second control module B , the third control module C, circuit control board, peristaltic pump (6), electromagnetic stirrer (7), wherein:

The first control module A is used to control the suction and push operation of the first syringe pump (4) according to the first control signal sent by the host computer, and the first syringe pump (4) is used to control the standard mother liquor according to the first control signal The bottle is sucked, and after the sucking, the liquid is pushed into the mixed solution pool (1) according to the first control signal.

The second control module B is used to control the suction and push operation of the second syringe pump (5) according to the second control signal sent by the host computer, and the second syringe pump (5) is used to dilute the diluent according to the second control signal. The bottle is sucked, and after the sucking, the liquid is pushed into the mixed solution pool (1) according to the second control signal.

The third control module C is used to control the peristaltic pump (6) to suck the mixed solution pool (1) according to the third control signal sent by the host computer;

The circuit control board is used to control the electromagnetic stirrer (7) to stir according to the fourth control signal sent by the host computer;

The water quality analyzer is used to detect the liquid coming in from the detection liquid pipe (8), and upload the detection result to the host computer;

The host computer is used to send a first control signal, a second control signal, a third control signal and a fourth control signal to the first control module A, the second control module B, the third control module C and the circuit control board; at the same time The upper computer is used to receive the detection result of the water quality analyzer, and obtain the judgment report of the water quality analyzer according to the detection result and the technical indicators of the national verification regulations.

A water quality online analyzer calibration method, comprising the following steps:

Step 1: The inspector connects the communication port of the tested water quality analyzer with the communication port of the upper computer of the calibration device, and connects the sampling system of the tested water quality analyzer with the detection liquid pipe (8).

Step 2, the standard mother liquor bottle that standard solution mother liquor is housed is communicated with the first liquid inlet pipe (41); The diluent liquid bottle that diluent is housed is communicated with the second liquid inlet pipe (51); And the diluted solution concentration is input to the host computer.

Step 3, the host computer calculates and obtains the amount of the standard solution mother solution and the amount of the diluent according to the concentration of the standard solution mother solution and the diluted solution concentration, and then obtains the feed rate of the first syringe pump (4) and the second syringe pump (5) ) feeding amount; the upper computer sends the first control signal to the first control module A according to the feeding amount of the first syringe pump (4), and sends the second control signal to the second control module B according to the feeding amount of the second syringe pump (5). For the control signal, the upper computer sends the fourth control signal to the circuit control board, and sends the fourth control signal to the second control module B.

Step 4, the first control module A controls the first syringe pump (4) to draw the standard solution mother solution from the standard mother solution bottle according to the first control signal; the second control module B controls the second syringe pump (5) from the diluted solution according to the second control signal The liquid bottle absorbs the diluent; the second control module B controls the second syringe pump (5) to inject the diluent into the mixed solution pool (1) according to the second control signal, and then the first control module A controls the second injection pump (5) according to the first control signal. A syringe pump (4) injects the mother solution of the standard solution into the mixed solution pool (1), and the mother solution of the standard solution is injected at least when the injection of the diluent is completed.

Step 5, the circuit control board controls the electromagnet (72) to stir and drive the stirring bar (73) according to the fourth control signal, and then stirs the liquid in the mixed solution pool (1).

Step 6: After the solution preparation is completed, the computer sends a sampling command to the tested water quality analyzer, and the tested water quality analyzer accepts the command to sample the solution in the mixed solution pool (1), and the tested water quality analyzer collects the water quality analysis information Upload to the host computer; and analyze the indication error, zero drift, indication stability, etc. After the analysis is completed, the analysis data will be sent to the computer.

Step 7: The upper computer analyzes, detects and automatically calibrates the tested water quality analyzer according to the analysis information of the tested water quality analyzer, and generates a judgment report, and the data results are traceable.

Automatic calibration means that the calibration device realizes the instruction sending and data receiving of the instrument through the communication protocol provided by the water quality online analyzer manufacturer, and completes the "indication error", "zero drift" and For the testing of items such as "indicating value stability", the calibration items can be adjusted according to the different instruments to be tested, not limited to the above three items. Automatically means that after the experimenter selects the experiment option, during the entire calibration process, there is no need to manually replace reagents, do not need to be on duty, and do not need to manually record data. The whole process is automatically completed by the calibration device.

The items analyzed and detected by the host computer to the tested water quality analyzer include indication error, zero drift, and indication stability.

7.1 Detection process and calculation method of indication error (COD)

After the water quality analyzer runs stably, introduce COD standard solutions with mass concentrations of C _S (50, 150, 500mg/L) in sequence for measurement, each solution is measured continuously for 3 times, and the indication error is calculated according to the following formula :

Among them, ΔC represents the indication error, Indicates the average value of the concentration measured by the tested water quality analyzer, and C _s indicates the concentration of the diluted solution.

7.2 Detection process and calculation method of zero drift (COD):

After the water quality analyzer is running stably, the computer controls the first syringe pump (4) and the second syringe pump (5) to prepare a zero-point calibration solution to the mixed solution pool (1), and introduce the prepared zero-point calibration solution into the tested water quality analysis Measure the zero-point calibration liquid with the instrument, record the measured initial zero value Z ₀ , introduce the zero-point calibration liquid into the tested water quality analyzer every 30 minutes within 4 hours, measure the zero-point indication value Z _i , and take the zero-point indication value that deviates from Z ₀ the most Z _i is used as the maximum zero indication value Z _max , and the difference between the maximum zero indication value Z _max and the initial zero value Z ₀ is taken as the zero drift.

7.3 Detection process and calculation method of index stability (COD):

After the water quality analyzer runs stably, the computer controls the first syringe pump (4) and the second syringe pump (5) to prepare a standard calibration solution to the mixed solution pool (1); import the prepared standard calibration solution into the tested water quality analyzer Solution, record the initial measurement value S0, and run continuously for 24 hours; introduce a standard calibration solution to the tested water quality analyzer every 1 hour within 24 hours, measure the measurement value Si, and take the measurement value Si that deviates from the initial measurement value S0 as the maximum measurement Value Smax, calculate the indication stability according to the following formula:

ΔS represents the stability of the indication, S _max represents the maximum measured value, and S ₀ represents the initial measured value.

Indication error, zero drift, and indication stability indicators are the evaluation indicators of the measurement performance of the instrument in the measurement specification. During the manual evaluation, it needs to be manually on duty for 40 hours and process the data. This calibration device can replace the manual and automatically complete the evaluation of the above measurement performance. .

In the utility model, the replacement of the detection solutions of different concentrations corresponding to different detection items of the same water quality analyzer to be tested is realized through the solution automatic preparation function of the calibration device, so there is no need for manual replacement of reagents. At the same time, the utility model adopts the same The device mixes detection solutions with different concentrations to reduce the human error of zero drift, indication stability and indication error detection results.

In addition, the host computer of the present utility model can adopt computer or other central processing units, and each function can be based on Windows and Win The operating system is implemented, which can send sample making instructions and receive data, and form a report after processing and calculating the data, and can give a conclusion whether the water quality analyzer to be tested is qualified or not.

Step 8, after the detection of a certain concentration solution is completed, the upper computer sends a third control signal to the third control module C, and the third control module C controls the peristaltic pump to discharge the waste liquid in the solution mixing tank, and closes after the waste liquid is discharged Peristaltic pump for preparation of the next detection concentration point;

After the waste liquid is discharged and before the preparation of the next detection concentration point, it also includes cleaning and drying the solution mixing tank, and the method is as follows: the control template B controls the second syringe pump (5) to draw the diluent from the diluent bottle and inject it into the mixed solution tank In (1), the upper computer sends the fourth control signal to the circuit control board, starts the electromagnetic stirrer (7) to clean the mixed solution pool (1), after cleaning, the peristaltic pump is controlled by the third control signal to discharge, and the cleaning is done for 3 At last, the peristaltic pump is controlled by the third control signal, and the electromagnetic stirrer (7) is started by the fourth control signal, so that the stirring bar (73) rotates, and then the mixed solution pool (1) is dried rapidly.

The utility model is based on the dilution of the calibration device and the uncertainty of the solution is less than 3% (k=2), and can be traced to the national standard by comparing with the national secondary standard substance, so its data data results can be traced.

In the present embodiment, the first syringe pump (4) and the second syringe pump (5) of the present utility model adopt quantitative pumps, the quantitative pump volume: 10ml, when the quantitative pump specifications are selected between 5ml, 10ml and 25ml, the test It shows that the quantitative syringe pump adopts two specifications of 10ml, and the operability and precision of solution preparation are the highest. Quantitative pump accuracy: 2uL/step. The speed of the quantitative pump motor can be adjusted according to the actual needs. The speed of this instrument is 30 rpm (adjustable), and the test shows that the volume accuracy of the pump at this speed is the highest.

Reset mode: The quantitative pump is equipped with a photoelectric switch at the maximum push point (reset position), and the quantitative pump is reset before dosing to ensure that there is no residual liquid in the quantitative pump and each pipeline is filled with diluent before each solution is prepared .

Control of remaining liquid in the pipeline: During the preparation process, when the quantitative pump is pushing, the pipeline is always kept full of liquid, and through program optimization, the pushing of the mother liquor is always completed first, and the pushing of the diluent is completed last, ensuring that the pipeline is full The liquid used is always the diluent (pure water) to improve the reproducibility of the preparation to achieve the purpose of controlling the accuracy.

While taking into account the efficiency, choose the pipeline with a diameter of 2mm, the total length of the connecting pipeline should be as short as possible, and the diameter of the pipe should be as small as possible to reduce the dead volume. All components are connected by high temperature, acid and alkali resistant PTFE tubes, and the pipeline interface is sealed with a pressure ring, so the contact area of the connection is small and the dead volume is small. Compared with the raw material tape sealing method, the sealing performance is more reliable and the operation is more convenient. During the whole sample making process, this connection method makes the pipeline completely fixed without loosening and reduces the detection failure rate. The size of the PTFE tube is 2.85*1.25mm.

Calibration device dosing liquid, tested by the absorbance of potassium dichromate solution, the solution preparation error is less than ± 2%, the whole system has systematic deviation, at this time, when the host computer generates the first control signal and the second control signal through the repeat test, the middle The introduction of the system correction factor K can reduce the error of the mechanical liquid distribution system, making the overall error better than ±1%.

The water quality on-line analyzer of the present utility model includes but not limited to chemical oxygen demand (COD) on-line analyzer, ammonia nitrogen on-line analyzer and other on-site non-laboratory water quality parameters applied to water sources, industrial sewage outlets, and water body environment monitoring points Analytical Instruments.

The utility model can be pushed by a single person to calibrate the water quality analyzer on site. The mobility of the calibration device ensures that the solution can be prepared and used immediately during analysis. Compared with the traditional artificially prepared solution brought to the site for analysis, it is no longer necessary to consider low concentration Detect the storage problem of the solution and the site requirements for solution preparation, and the solution preparation has higher reproducibility.

The utility model realizes the automatic calibration of the online water quality analyzer, unattended, according to the predetermined standards or requirements (such as national metrology verification regulations, calibration specifications and other technical specifications), all measurement indicators of the water quality online analyzer are checked. A series of continuous and uninterrupted analysis tests, collecting data and analyzing and processing, and judging whether the calibration results meet the relevant index requirements, and generating corresponding original calibration reports. An output port for external data communication is reserved to realize the preparation for remote collection of calibration results. The entire process is intelligently processed without manual intervention. At the same time, the device has the function of automatic maintenance, which can automatically clean and maintain during the running interval or standby state, so as to improve the reliability and stability of the device operation.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (5)

1. a kind of liquid mixing equipment, it is characterised in that：Including solution mixing pit (1), mixing pit inlet tube (2), the first injection Pump (4), the first inlet tube (41), the first outlet tube (42), the second syringe pump (5), the second inlet tube (51), the second outlet tube (52), magnetic stirrer (7), wherein：

The liquid feeding end of first syringe pump (4) by the first inlet tube (41) with standard mother liquid multi-cavity bottle for being connect, and outlet end It is connected to solution mixing pit (1) by the first outlet tube (42)；The liquid feeding end of second syringe pump (5) be used for by second into Liquid pipe (51) is connect with dilution bottle, and outlet end is connected to by the second outlet tube (52) with solution mixing pit (1)；The solution Mixing pit (1) includes with open major trough body (11), capping (12), and the capping (12) is used to cover in the spacious of major trough body (11) On mouth, major trough body (11) is closed；Major trough body (11) bottom is provided with feed pathway (111), detection liquid flow pass (112) And apocenosis passage (113)；

The magnetic stirrer (7) includes electromagnet fixed seat (71), electromagnet (72), stirrer (73), and the electromagnet is solid Reservation (71) is used to electromagnet (72) being fixed on the bottom of major trough body (11), and the stirrer (73) is set to major trough body (11) interior intracavitary.

2. liquid mixing equipment according to claim 1, it is characterised in that：Further include Y-type three way type (3), the Y-type three way type (3) it is the pipe fitting of two import one outlets, respectively the first inlet tube, the second inlet tube and first outlet pipe；It is described mixed It closes pond inlet tube (2) one end to connect with first outlet pipe, the other end is connect with solution mixing pit (1)；First outlet tube (42) one end, first go out liquid check valve (44) and the first inlet tube is sequentially connected, and first outlet tube (42) is another One end is connect with the outlet end of standard mother liquid multi-cavity bottle；One end of second outlet tube (52), second go out liquid check valve (54) and Second inlet tube is sequentially connected, and the other end of second outlet tube (52) is connect with the outlet end of dilution bottle；Described Junction between one inlet tube and the first outlet tube (42) is provided with the first feed liquor check valve (43) for preventing liquid reflux, institute The junction for stating the second inlet tube and the second outlet tube (52) is provided with the second feed liquor check valve (53) for preventing liquid reflux.

3. liquid mixing equipment according to claim 2, it is characterised in that：Described first, which goes out liquid check valve (44) closing mouth, arrives The distance L of first inlet tube outlet goes out liquid check valve (44) outlet end caliber R less than 4 times first；Described second goes out liquid check valve (54) closing mouth goes out liquid check valve (54) outlet end caliber R to the distance L that the second inlet tube exports less than 4 times second.

4. liquid mixing equipment according to claim 2, it is characterised in that：Between first inlet tube, the second inlet tube Angle angle be 45 °.

5. liquid mixing equipment according to claim 1, it is characterised in that：The inlet of the apocenosis passage (113) is located at The bottom of major trough body (11) inner cavity, and the inlet of the feed pathway (111) is higher than the feed liquor of detection liquid flow pass (112) Mouthful, while the inlet of the apocenosis passage (113) is less than the inlet of detection liquid flow pass (112), the detection liquid stream Go out channel (112) for connecting inspection by sampling equipment.