Full-automatic water sample multi-dimensional mixing sample injector

Abstract

The utility model relates to the technical field of water sample analysis, in particular to a full-automatic water sample multi-dimensional mixing sample injector which comprises a sample bearing platform, a sampling assembly, a flow dividing module, a mixing cavity and an auxiliary cleaning module. The sampling assembly achieves accurate sampling through a lifting support and a sampling arm, the flow dividing module distributes samples through a multi-channel valve body and a switching mechanism, the mixing cavity achieves uniform mixing through a spiral flow guide plate and stirring blades, and the auxiliary cleaning module effectively removes residues. The intelligent control system integrates a central processing unit, a touch screen and a sensor, and the operation automation level is improved. The requirement of complex water sample analysis on multi-dimensional mixed sample introduction can be met, the analysis precision and the equipment reliability are improved, and the operation efficiency is remarkably optimized.

Description

Technical Field

[0001] This utility model belongs to the technical field of water quality testing and analysis equipment, specifically a fully automatic water sample multidimensional mixing sampler. Background Technology

[0002] When analyzing complex water samples, appropriate sample injectors are required to achieve precise sample introduction, hence the widespread use of various sample injectors. However, most sample injectors on the market currently employ a single injection mode, which is insufficient to meet the needs of multidimensional mixed injection when processing complex water samples, especially in terms of multi-component mixing and efficient injection. This can lead to problems such as reduced analytical efficiency and increased operational complexity.

[0003] A search revealed an autosampler with publication number CN108535392B that achieves high-precision positioning of the injection needle through a structure including a main slide bar, rack and pinion housing, and stepper motor. However, its design is primarily aimed at precise injection of a single sample, and its ability to support multidimensional mixed injection is limited, potentially failing to fully meet the needs of multi-component water sample analysis. Furthermore, its cleaning function is relatively simple, and incomplete removal of residues may affect subsequent analytical results.

[0004] Further research revealed a fully automated headspace sampler (publication number CN114994225B) that achieves uniform heating and injection of sample vials through a sample tray and heating chamber. However, its application is primarily limited to headspace sampling, failing to adequately support the multidimensional mixing injection requirements in complex water sample analysis. Furthermore, it lacks multi-channel or multi-component mixing capabilities, making it difficult to meet the demands of modern water sample analysis for intelligence and multifunctionality. These issues indicate that existing samplers have room for improvement in addressing the multidimensional mixing injection needs in complex water sample analysis. Utility Model Content

[0005] This invention provides a fully automatic multidimensional mixing sampler for water samples, aiming to solve the problem that existing samplers cannot meet the needs of multidimensional mixing sampler for complex water sample analysis.

[0006] The present invention adopts the following technical solution:

[0007] A fully automated water sample multidimensional mixing injector includes: a sample carrying platform fixedly mounted on a base for placing water sample containers to be analyzed; a sampling component disposed above the sample carrying platform for extracting samples from water sample containers at different locations; a flow splitting module connected to the sampling component for distributing the extracted samples to multiple independent channels; and a mixing chamber disposed at the rear end of the flow splitting module for uniformly mixing the samples delivered from different channels and outputting them to an analytical instrument.

[0008] Preferably, the sampling assembly includes: a lifting bracket fixedly mounted on the base, the lifting bracket being provided with a slide rail; a sampling arm slidably mounted on the slide rail, one end of the sampling arm being provided with a sampling needle, and the other end being connected to a drive device through a transmission mechanism; and a drive motor fixedly mounted on the top of the lifting bracket, the output shaft of the drive motor meshing with the transmission mechanism to drive the sampling arm to move up and down and rotate along the slide rail.

[0009] Preferably, the transmission mechanism includes: a rack fixedly mounted on the sampling arm, the rack meshing with a gear on the output shaft of the drive motor; a guide groove provided on the lifting bracket, the guide groove having a ball bearing embedded therein, the ball bearing contacting the outer wall of the sampling arm to reduce friction and ensure smooth movement of the sampling arm.

[0010] Preferably, the diversion module includes: a multi-channel valve body fixedly installed at the end of the sampling arm, wherein the multi-channel valve body is provided with multiple independent flow channels, each flow channel being connected to a sampling needle; a switching mechanism disposed inside the multi-channel valve body, the switching mechanism being driven by a stepper motor to control the opening or closing of each flow channel; and a buffer chamber fixedly installed at the outlet end of the multi-channel valve body, the buffer chamber being used to temporarily store the diverted sample.

[0011] Preferably, the switching mechanism includes: a cam disk fixedly sleeved on the output shaft of the stepper motor, the edge of the cam disk having multiple grooves; a piston rod slidably mounted in the multi-channel valve body, one end of the piston rod engaging with the groove of the cam disk, and the other end directly contacting the valve of the flow channel; and an elastic element disposed on the outside of the piston rod, the elastic element being used to push the piston rod to reset when the cam disk rotates.

[0012] Preferably, the mixing chamber includes: a mixing chamber fixedly installed at the outlet end of the diversion module, wherein a spiral guide plate is provided in the mixing chamber; a stirring blade fixedly installed at the bottom of the mixing chamber, wherein the stirring blade is connected to a micro motor via a coupling; and a filter screen provided at the outlet end of the mixing chamber, wherein the filter screen is used to remove impurity particles from the sample.

[0013] Preferably, the spiral guide plate includes: a plurality of spiral baffles fixedly installed on the inner wall of the mixing chamber, the baffles forming a continuous spiral channel; and a diffuser port disposed at the end of the spiral channel, the diffuser port being used to accelerate sample flow and increase mixing effect.

[0014] Preferably, the base is provided with an auxiliary cleaning module, which includes: a cleaning fluid tank fixedly installed on one side of the base, the cleaning fluid tank being connected to the sampling needle via a pipe; a solenoid valve installed on the pipe for controlling the flow of the cleaning fluid; and a nozzle fixedly installed near the sampling needle for spraying the cleaning fluid onto the surface of the sampling needle.

[0015] Preferably, the base is also equipped with an intelligent control system, which includes: a central processing unit fixedly installed on the base, the central processing unit being electrically connected to the drive motor, stepper motor and solenoid valve; a touch screen installed on the central processing unit for inputting operation commands; and a sensor fixedly installed at the outlet end of the mixing chamber for detecting sample flow and feeding the data back to the central processing unit.

[0016] Preferably, the sample carrying platform is provided with a positioning hole array, which is used to fix water sample containers of different sizes; a pressure sensor is provided at the center of the positioning hole array, which is used to detect whether the water sample container is correctly placed.

[0017] Compared with existing technologies, the fully automated multidimensional water sample mixing injector provided by this invention, through the setting of a multi-channel diversion module and a mixing chamber, can accurately distribute and uniformly mix samples from different water sample containers, thereby meeting the needs of multidimensional mixing injection for complex water sample analysis. Furthermore, the design of the auxiliary cleaning module effectively avoids the influence of residues on subsequent analytical results, improving the reliability and service life of the equipment. At the same time, the introduction of an intelligent control system makes the entire injection process more automated and intelligent, significantly improving operational efficiency and analytical accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the fully automatic water sample multidimensional mixing injector of this utility model.

[0019] Figure 2 This is a schematic diagram of the sampling component.

[0020] Figure 3 This is a schematic diagram of the power distribution module.

[0021] Figure 4 This is a cross-sectional view of the mixing chamber.

[0022] Figure 5 This is a schematic diagram of the auxiliary cleaning module and intelligent control system on the base.

[0023] In the diagram, 1. Sample carrying platform; 2. Sampling component; 3. Diversion module; 4. Mixing chamber; 5. Lifting bracket; 6. Sampling arm; 7. Sampling needle; 8. Drive motor; 9. Multi-channel valve body; 10. Switching mechanism; 11. Buffer chamber; 12. Mixing chamber; 13. Spiral guide plate; 14. Stirring blade; 15. Filter screen; 16. Cleaning fluid tank; 17. Solenoid valve; 18. Nozzle; 19. Central processing unit; 20. Touch screen; 21. Sensor. Detailed Implementation

[0024] To facilitate understanding of the technical solution of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0025] This utility model provides a fully automatic water sample multidimensional mixing injector, the structure of which is as follows: Figure 1The fully automated water sample multidimensional mixing injector is presented as a whole. It includes a sample carrying platform 1, a sampling component 2, a diversion module 3, a mixing chamber 4, an auxiliary cleaning module, and an intelligent control system. The sample carrying platform 1 is fixedly mounted on a base and is used to hold the water sample container to be analyzed. It has an array of positioning holes, and a pressure sensor at the center of the array detects whether the water sample container is correctly positioned. The sampling component 2 is located above the sample carrying platform 1 and includes a lifting bracket 5, a sampling arm 6, a sampling needle 7, and a drive motor 8. The lifting bracket 5 is fixedly mounted on the base and has a slide rail. The sampling arm 6 is slidably mounted on the slide rail, with the sampling needle 7 at one end and the other end connected to the drive motor 8 via a transmission mechanism. The drive motor 8 is fixedly mounted on the top of the lifting bracket 5, and its output shaft meshes with the transmission mechanism, driving the sampling arm 6 to move up and down and rotate along the slide rail. The diversion module 3 is connected to the sampling component 2 and includes a multi-channel valve body 9, a switching mechanism 10, and a buffer chamber 11. The multi-channel valve body 9 has multiple independent flow channels, each connected to a sampling needle 7. The switching mechanism 10 is driven by a stepper motor to control the opening or closing of each flow channel. The buffer chamber 11 is used to temporarily store the diverted sample. The mixing chamber 4 is located at the rear end of the diversion module 3 and includes a mixing chamber 12, a spiral guide plate 13, stirring blades 14, and a filter screen 15. The spiral guide plate 13 is installed inside the mixing chamber 12, and stirring blades 14 are installed at the bottom and connected to a micro motor via a coupling. A filter screen 15 is installed at the outlet end. The auxiliary cleaning module includes a cleaning fluid tank 16, a solenoid valve 17, and a nozzle 18. The cleaning fluid tank 16 is fixedly installed on one side of the base and connected to the sampling needle 7 via a pipe. The solenoid valve 17 is installed on the pipe to control the flow of the cleaning fluid. The nozzle 18 is fixedly installed near the sampling needle 7 to spray cleaning fluid onto the surface of the sampling needle 7. The intelligent control system includes a central processing unit 19, a touch screen 20, and a sensor 21. The central processing unit 19 is fixedly mounted on the base and electrically connected to the drive motor 8, the stepper motor, and the solenoid valve 17. The touch screen 20 is set on the central processing unit 19 for inputting operation commands. The sensor 21 is fixedly mounted at the outlet end of the mixing chamber 4 for detecting the sample flow rate and feeding the data back to the central processing unit 19.

[0026] The specific structure of sampling component 2 is as follows: Figure 2As shown, the sampling arm 6 is mounted on the lifting bracket 5 via a slide rail. The transmission mechanism includes a rack and a gear. The rack is fixedly mounted on the sampling arm 6 and meshes with the gear on the output shaft of the drive motor 8. A guide groove is provided on the lifting bracket 5 and a ball bearing is embedded therein. The ball bearing contacts the outer wall of the sampling arm 6 to reduce friction and ensure smooth movement of the sampling arm 6. When the drive motor 8 starts, the output shaft drives the gear to rotate, and the gear meshes with the rack, causing the sampling arm 6 to move up and down along the slide rail. The sampling needle 7 is mounted on one end of the sampling arm 6 and is used to extract samples from water sample containers at different locations. During the sampling process, the central processing unit 19 controls the drive motor 8 to run according to the instructions input on the touch screen 20. The drive motor 8 moves the sampling arm 6 above the target water sample container. The sampling needle 7 descends into the container to absorb the sample, then rises and returns to the initial position, completing the sampling operation.

[0027] The internal structure of the current splitter module 3 is as follows: Figure 3 As shown, the multi-channel valve body 9 is provided with multiple independent flow channels, each of which is connected to a sampling needle 7. The switching mechanism 10 includes a cam plate, a piston rod, and an elastic element. The cam plate is fixedly sleeved on the output shaft of the stepper motor and has multiple grooves on its edge. The piston rod is slidably installed in the multi-channel valve body 9, with one end engaging with the groove of the cam plate and the other end directly contacting the valve of the flow channel. The elastic element is located on the outside of the piston rod to push the piston rod to reset.

[0028] When the stepper motor starts, its output shaft begins to rotate, driving the cam disk fixed on it to rotate synchronously. During rotation, the groove on the edge of the cam disk contacts one end of the piston rod. Due to the shape and position design of the groove, when the cam disk rotates to a specific angle, the groove pushes the piston rod to move along the sliding direction within the valve body. This movement is precisely controlled to ensure that the piston rod accurately reaches the predetermined position. The other end of the piston rod directly contacts the valve of the flow channel. When the piston rod is pushed by the cam disk, it transmits force to the valve, thereby opening or closing the corresponding flow channel. In this way, the sample extracted by the sampling needle 7 can be distributed into different independent channels. When the cam disk continues to rotate and its groove no longer contacts the piston rod, the elastic element comes into play. The elastic element pulls the piston rod back to its initial position, preparing for the next action. This reset mechanism ensures that the piston rod accurately returns to its initial position after each action, thus guaranteeing the reliability and accuracy of the switching mechanism. The buffer chamber 11 is fixedly installed at the outlet end of the multi-channel valve body 9 to temporarily store the sample after diversion, ensuring the continuity and stability of the sample flow.

[0029] The structure of the mixing chamber 4 is as follows Figure 4As shown, a spiral guide plate 13 is installed inside the mixing chamber 12. The spiral guide plate 13 includes multiple spiral baffles fixedly installed on the inner wall of the mixing chamber 12, forming a continuous spiral channel between the baffles. A diffuser is provided at the end of the spiral channel to accelerate sample flow and increase the mixing effect. A stirring blade 14 is installed at the bottom of the mixing chamber 12 and connected to a micro motor through a coupling. When the micro motor starts, it drives the stirring blade 14 to rotate to further promote sample mixing. A filter screen 15 is set at the outlet of the mixing chamber 12 to remove impurity particles from the sample and ensure the purity of the output sample. After the flow splitting module 3 delivers the sample to the mixing chamber 4, the sample first passes through the spiral channel formed by the spiral guide plate 13. During the flow, it is guided by the spiral baffles to generate a vortex effect. Then it enters the diffuser to accelerate the flow and mix with other samples. Finally, under the action of the stirring blade 14, it achieves uniform mixing and is output to the analytical instrument after passing through the filter screen 15.

[0030] The layout of the auxiliary cleaning module and intelligent control system is as follows: Figure 5 As shown, the cleaning fluid tank 16 is fixedly installed on one side of the base and connected to the sampling needle 7 via a pipe. A solenoid valve 17 is installed on the pipe to control the flow of the cleaning fluid. A nozzle 18 is fixedly installed near the sampling needle 7 to spray the cleaning fluid onto its surface. A central processing unit 19 is fixedly installed on the base and electrically connected to the drive motor 8, stepper motor, and solenoid valve 17. A touchscreen 20 is located on the central processing unit 19 for inputting operating commands. A sensor 21 is fixedly installed at the outlet of the mixing chamber 4 to detect the sample flow rate and feed the data back to the central processing unit 19. After sampling, the central processing unit 19 controls the solenoid valve 17 to open, and the cleaning fluid is transported from the cleaning fluid tank 16 through the pipe to the nozzle 18. The nozzle 18 sprays the cleaning fluid onto the surface of the sampling needle 7 to remove residues. After cleaning, the solenoid valve 17 closes to stop the supply of cleaning fluid. The entire sampling process is monitored by an intelligent control system. The central processing unit 19 receives the sample flow rate data from the sensor 21 and adjusts the operating parameters of each component according to a preset program to ensure the automation and intelligence of the sampling process.

[0031] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the operating principle and implementation steps of the fully automatic water sample multidimensional mixing sampler is provided in conjunction with a specific application scenario.

[0032] In practical applications, suppose we need to analyze three different types of complex water samples, and each sample needs to be mixed in a specific ratio before being fed into the analytical instrument. In this case, the specific operating procedure of the fully automated multidimensional water sample mixing injector is as follows:

[0033] First, the water sample container to be analyzed is placed on the sample support platform 1. The positioning hole array and pressure sensor on the sample support platform 1 work together to ensure that each water sample container is accurately positioned and fixed. When the pressure sensor detects that the container is correctly placed, the signal is transmitted to the central processing unit 19 to confirm that the sampling preparation is complete.

[0034] Subsequently, the intelligent control system initiates the operation of sampling component 2. The central processing unit 19 controls the drive motor 8 to start based on instructions input from the touchscreen 20. The drive motor 8, through the meshing of gears and racks, moves the sampling arm 6 along the slide rail on the lifting bracket 5. Simultaneously, the ball bearings in the guide groove reduce friction, ensuring smooth movement of the sampling arm 6. One end of the sampling arm 6 is equipped with a sampling needle 7, which rotates and descends according to a preset path into the target water sample container, drawing the first water sample before rising and returning to its initial position. This process repeats until all target water samples have been extracted.

[0035] Next, the sample extracted by the sampling needle 7 is distributed through the splitting module 3. A stepper motor drives the cam disk in the switching mechanism 10 to rotate, and the groove on the edge of the cam disk pushes the piston rod to move, thereby opening or closing the independent flow channels within the multi-channel valve body 9. Each flow channel is connected to a sampling needle 7, so the sample can be precisely distributed to different independent channels. The buffer chamber 11 temporarily stores the split sample, ensuring the continuity and stability of the sample flow and avoiding uneven mixing caused by flow fluctuations.

[0036] After the sample enters the mixing chamber 4, it begins to be uniformly mixed. The flow distribution module 3 delivers the sample to the mixing chamber 12, where it first passes through a spiral channel formed by the spiral guide plate 13. The spiral baffle guides the sample to generate a vortex effect, causing it to be initially mixed during flow. Subsequently, the sample enters the diffuser to accelerate flow and further enhance the mixing effect. A micro motor drives the stirring blades 14 to rotate, performing deeper stirring and mixing of the sample, ultimately forming a homogeneous mixture. A filter screen 15 is installed at the outlet of the mixing chamber 12 to remove impurity particles from the sample, ensuring that the purity of the output sample meets the analytical requirements.

[0037] After sampling and mixing are completed, the auxiliary cleaning module is activated to remove residues from the surface of the sampling needle 7. The central processing unit 19 controls the solenoid valve 17 to open, and the cleaning solution is delivered from the cleaning solution tank 16 through a pipeline to the nozzle 18. The nozzle 18 sprays the cleaning solution onto the surface of the sampling needle 7 to thoroughly remove any residual substances that may affect subsequent analysis. After cleaning is completed, the solenoid valve 17 closes, stopping the supply of cleaning solution.

[0038] The entire sample injection process is monitored by an intelligent control system. Sensor 21 is installed at the outlet of the mixing chamber 4 to detect the sample flow rate in real time and feed the data back to the central processing unit 19. The central processing unit 19 adjusts the operating parameters of each component according to a preset program to ensure the automation and intelligence of the sample injection process. For example, when sensor 21 detects an abnormal sample flow rate, the central processing unit 19 will automatically adjust the operating status of the stepper motor or drive motor 8 to restore normal sample flow.

[0039] Through the above steps, the fully automated multidimensional water sample mixing injector meets the multidimensional mixing and injection requirements of complex water samples. This equipment not only efficiently and accurately extracts and homogenizes multi-component samples, but also effectively avoids the influence of residues on analytical results through an auxiliary cleaning module, thus significantly improving analytical efficiency and reliability. Simultaneously, the introduction of an intelligent control system makes operation more convenient, greatly reducing the need for manual intervention and providing strong technical support for modern water sample analysis.

[0040] The above are merely preferred embodiments of this utility model. The scope of protection of this utility model is defined by the scope of the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of this utility model should also be considered as protection within the scope of this utility model.

Claims

1. A fully automatic water sample multidimensional mixing and injecting device, characterized in that, include: A sample carrying platform (1) is fixedly installed on the base for placing the water sample container to be analyzed; The sampling component (2) is set above the sample carrying platform (1) for extracting samples from water sample containers at different locations; The diversion module (3) connected to the sampling component (2) is used to distribute the extracted sample to multiple independent channels; The mixing chamber (4) located at the rear end of the splitting module (3) is used to uniformly mix the samples delivered from different channels and output them to the analytical instrument.

2. The fully automatic water sample multidimensional mixing injector as described in claim 1, characterized in that, The sampling component (2) includes: A lifting bracket (5) is fixedly installed on the base, and a slide rail is provided on the lifting bracket (5); A sampling arm (6) is slidably mounted on the slide rail. One end of the sampling arm (6) is equipped with a sampling needle (7), and the other end is connected to the drive device through a transmission mechanism. A drive motor (8) is fixedly installed on the top of the lifting bracket (5). The output shaft of the drive motor (8) meshes with the transmission mechanism to drive the sampling arm (6) to move up and down and rotate along the slide rail.

3. The fully automatic water sample multidimensional mixing injector as described in claim 2, characterized in that, The transmission mechanism includes: A rack is fixedly mounted on the sampling arm (6), and the rack meshes with a gear on the output shaft of the drive motor (8); A ball bearing is provided at the lower end of the sampling arm (6), which is connected to the slide rail to reduce friction and ensure smooth movement of the sampling arm (6).

4. The fully automatic water sample multidimensional mixing and injection device as described in claim 1, characterized in that, The splitting module (3) includes: A multi-channel valve body (9) is fixedly installed at the end of the sampling arm (6). The multi-channel valve body (9) is provided with multiple independent flow channels, and each flow channel is connected to a sampling needle (7). The switching mechanism (10) is installed inside the multi-channel valve body (9). The switching mechanism (10) is driven by a stepper motor and is used to control the opening or closing of each flow channel. A buffer chamber (11) is fixedly installed at the outlet end of the multi-channel valve body (9), and the buffer chamber (11) is used to temporarily store the sample after diversion.

5. The fully automated water sample multidimensional mixing and injection device as described in claim 4, characterized in that, The switching mechanism (10) includes: A cam disk is fixedly sleeved on the output shaft of the stepper motor, and the edge of the cam disk is provided with multiple grooves; a piston rod is slidably installed in the multi-channel valve body (9), one end of the piston rod is engaged with the groove of the cam disk, and the other end is in direct contact with the valve of the flow channel; An elastic element disposed on the outside of the piston rod is used to push the piston rod back to its original position when the cam disc rotates.

6. The fully automated water sample multidimensional mixing and injection device as described in claim 1, characterized in that, The mixing chamber (4) includes: A mixing chamber (12) is fixedly installed at the outlet end of the diversion module (3), and a spiral guide plate (13) is provided inside the mixing chamber (12); A stirring blade (14) is fixedly installed at the bottom of the mixing chamber (12), and the stirring blade (14) is connected to a micro motor via a coupling; A filter screen (15) is provided at the outlet end of the mixing chamber (12) for removing impurity particles from the sample.

7. The fully automatic water sample multidimensional mixing sampler as described in claim 6, characterized in that, The spiral guide plate (13) includes: Multiple spiral baffles are fixedly installed on the inner wall of the mixing chamber (12), and the baffles form a continuous spiral channel; A diffuser port is located at the end of the spiral channel, which is used to accelerate sample flow and increase mixing effect.

8. The fully automated water sample multidimensional mixing and injection device as described in claim 1, characterized in that, It also includes an auxiliary cleaning module, which includes: A cleaning fluid tank (16) is fixedly installed on one side of the base, and the cleaning fluid tank (16) is connected to the sampling needle (7) through a pipe; A solenoid valve (17) is installed on the pipeline, and the solenoid valve (17) is used to control the flow of cleaning fluid. A nozzle (18) is fixedly installed near the sampling needle (7), and the nozzle (18) is used to spray cleaning fluid onto the surface of the sampling needle (7).

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