A method and system for precise metering of multiple solutions

Abstract

This invention discloses a method and system for precise quantitative metering and injection of multiple solutions. The injection system includes a control module 10, a metering module 1, a driver 2, a spiral tube 4, a reactor 6, a clamp valve 8, a photodetector 9, a shut-off valve 11-N, a first-position two-way three-way valve 3, and a second-position two-way three-way valve 5. The injection method includes extraction metering, precise quantification, and back-propellant injection. This method and system for precise quantitative metering and injection of multiple solutions belongs to the field of online environmental monitoring and analytical chemistry. Using electronic technology, it can achieve automatic online precise metering and quantitative injection of multiple reagents, and can meter and quantify any volume to meet the different reagent metering volumes of automatic online instruments. Its compact structure and simple layout not only meet the requirements for precise quantitative metering and injection of multiple solutions, but also improve the product's integration, stability, and accuracy, while reducing the product's failure rate and cost.

Description

Technical Field

[0001] This invention relates to the fields of online environmental monitoring and analytical chemistry, and in particular to a method and system for precise quantitative metering and injection of multiple solutions. Background Technology

[0002] Environmental online monitoring instruments are widely used and play a vital role in environmental monitoring and water quality analysis. The precise measurement and quantification of their metering and injection systems are crucial to the accuracy and stability of the results. Since these instruments often inject a variety of reagents, a metering and injection system capable of precise measurement and quantification of multiple reagents is an essential component. Therefore, an automated metering and injection method and system capable of precise measurement and quantification of multiple reagents is needed. Furthermore, the stability of the metering and injection system is crucial to the stability of the measurement results and the instrument's operational stability. Therefore, a highly stable automated metering and injection method and system are required. Finally, the low cost of the metering and injection system is vital to the market competitiveness of environmental online monitoring instruments; therefore, a low-cost automated metering and injection method and system are necessary. Summary of the Invention

[0003] The main objective of this invention is to provide a method and system for precise quantitative metering and injection of multiple solutions, which can effectively solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method and system for precise quantitative metering and injection of multiple solutions includes a control module 10, a metering module 1, an actuator 2, a spiral tube 4, a reactor 6, a pinch valve 8, a photodetector 9, and shut-off valves 11-N, a first two-position three-way valve 3, and a second two-position three-way valve 5. The metering module 1 includes a metering tube 1-3, a left metering body 1-2 selectively connected to multiple shut-off valves 11-N, and a right metering body 1-1 connected to the actuator 2, the pinch valve 8, the stop valve 7, and the left metering body 1-2. The first two-position three-way valve 3 has its common end connected to the actuator 2, its normally open end connected to air, and its normally closed end connected to the spiral tube 4. The second two-position three-way valve 5 has its common end connected to the reactor 6, its normally open end connected to the spiral tube 4, and its normally closed end connected to air. The control module 10 is connected to the actuator 2, the photodetector 9, the pinch valve 8, the first two-position three-way valve 3, and the multiple shut-off valves 11-N to control their on / off states and status.

[0006] The right measuring body 1-1 has a vertical tube at a relatively high position in the internal cavity, and a measuring tube 1-3 extends into the cavity. An overflow receiving tube is located at a relatively low position in the internal cavity. The upper end of the overflow receiving tube of the right measuring body 1-1 has a photoelectric detector 9, and the bottom end is connected by a flexible tube that passes through a clamp valve 8. The top of the vertical tube in the cavity of the right measuring body 1-1 is connected to the top of the overflow receiving tube by a slope or groove. Once the target reagent overflows from the top of the measuring tube 1-3, it immediately enters the overflow receiving tube. The bottom end of the vertical tube of the right measuring body 1-1 is connected to the stop valve 7 through a connector, and the side of the measuring tube 1-3 is connected to the bottom connector of the left measuring body 1-2 through a connector.

[0007] The right measuring body 1-1 has a sealing cover at the top of its internal cavity, which is completely sealed by a sealing ring. The cover has a connector that connects to the driver 2. The measuring body is made of glass, polytetrafluoroethylene, ceramic or plexiglass, and the cavity is circular, conical or other polygonal.

[0008] The clamp valve 8 controls the opening and closing of the hose and ensures a complete seal. The overflow receiver is made of transparent glass or plexiglass. The diameter of the overflow receiver is determined to ensure that liquids and reagents can flow down. The overflow of the right measuring body 1-1 is also replaced by a timer instead of the photoelectric detector 9.

[0009] The bottom end of the vertical pipe of the right measuring body 1-1 is also connected to the bottom end connector of the left measuring body 1-2 through a connector, and is connected to the shut-off valve 11-N through a connector on the side of the vertical pipe.

[0010] The left measuring body 1-2 also has a cavity, which is cylindrical, conical, spherical or rhomboid in shape. The top has a cap that is sealed by a sealing rubber ring to achieve a complete sealing effect. There is a connector in the middle of the cap that connects to the pipeline and the shut-off valve 11-N. Multiple shut-off valves 11-N can be connected to one of the vertical sides of the cavity to realize the connection of multiple reagent pipelines.

[0011] The position of the through-hole diameter of the left measuring body 1-2 can be adjusted, and the through-hole can be customized according to the angle, height or position; the multiple shut-off valves 11-N connected to the left measuring body 1-2 are matched according to the number of reagents.

[0012] The right measuring body 1-1 and the left measuring body 1-2 are connected by a connector to a measuring tube 1-3. The tube is made of a corrosion-resistant material. The length and inner diameter of the tube are optional and depend on the required measuring volume. The tube can be transparent, semi-transparent or opaque. The internal aperture of the right measuring body 1-1 and the left measuring body 1-2 is 1mm or 2mm, depending on the size of the impurities in the liquid to ensure that it is not blocked.

[0013] The metering tubes 1-3, which are connected by a connector between the right metering body 1-1 and the left metering body 1-2, are fitted with a photoelectric detector 9 in the middle of the tubes to assist in determining whether the reagents and solutions to be metered in a multi-solution precise quantitative metering injection system have been used up and whether they have been successfully quantified.

[0014] The overflow port of the metering vertical tube of the right metering body 1-1 is equipped with a liquid path detection switch. Once the solution or reagent overflows, it will be detected by the liquid path detection switch immediately to assist in determining whether the reagent and solution to be metered in a multi-solution precise quantitative metering injection system have been used up and whether they have been successfully quantified.

[0015] The clamp valve and hose used to control the opening and closing of the hose are replaced with a shut-off valve 11-N and a rigid pipe, which are connected to the bottom end of the overflow receiving pipe through a connector.

[0016] The reactor has a cavity inside, with the upper end connected to the stop valve 7 and the lower end connected to the common end of the second two-position three-way valve 5. The material is glass or ceramic, and the volume is determined according to the needs. It can be transparent or opaque, depending on the needs.

[0017] The spiral tube is made of a corrosion-resistant material. The length and inner diameter of the spiral tube are optional. The total volume of the spiral tube should be greater than the volume of the reactor, with a margin of 10-50%.

[0018] The driver 2 can rotate clockwise and counterclockwise and the speed can be adjusted; the operation of the driver 2 and the determination of whether the metering reagent overflows can be achieved by setting a fixed time, and the overflow of liquid can also be detected by the photoelectric detector 9 to determine the metering quantity.

[0019] An additional metering module 1a is added side-by-side to metering module 1, along with a two-position three-way valve at the top and bottom. The common terminal of the upper two-position three-way valve is connected to the actuator 2, and its normally open / normally closed positions are connected to metering module 1 and the other metering module 1a, respectively. The common terminal of the lower two-position three-way valve is connected to the reaction cell 6, and its normally open / normally closed positions are connected to metering module 1 and the other metering module 1a, respectively, enabling rapid injection of different volumes. The number of metering modules matches the number of two-position valves, which can be selected as two-position four-position, two-position N-position, etc.

[0020] A sample injection method for a multi-solution precise quantitative metering injection system includes the following steps:

[0021] ① Extraction and metering: Under the control of the control module 10, a certain shut-off valve 11-N is opened. Under the suction force of the clockwise rotation of the driver 2, the reagent enters the left metering body 1-2 cavity, metering tube 1-3, and the suction tube of the right metering body 1-1 through the corresponding pipeline and connector from the opened shut-off valve 11-N. After overflowing, it enters the overflow tube and is detected by the photoelectric detector 9 or after a fixed time is set. The driver 2 stops rotating, and the extraction and metering is completed.

[0022] ② Precise quantification: After the extraction and measurement are completed, under the control of the control module 10, the reagent shut-off valve 11-N is closed, the driver 2 rotates counterclockwise for a certain period of time and then stops, the stop valve 7 is opened, the driver 2 rotates counterclockwise, the shut-off valve 11-N is opened, and the measured reagent enters the reactor 6 and the spiral tube 4 through the stop valve 7 under the suction of the driver. The reagent is temporarily stored in the spiral tube 4, thus completing the quantification of the reagent.

[0023] ③ Reverse propulsion: Under the control of the control module 10, the reagent in the spiral tube 4 enters the reactor 6 through the two-position three-way valve 5, thus completing the reverse propulsion.

[0024] In the above scheme, the preferred option is that the driver can rotate clockwise and counterclockwise and the speed can be adjusted.

[0025] In the above scheme, apart from the rotation of the driver and the opening and closing of the two-position three-way valve and the shut-off valve, there are no other moving or frictional parts, and the sample injection process is very stable and reliable.

[0026] Compared with existing technologies, the multi-solution precise quantitative metering and injection method and system of the present invention adopts electronic technology, has virtually no moving or friction parts, thus exhibiting high stability; reduces the number of shut-off valves required by varying the types of reagents, resulting in lower costs; can meet the needs of any required reagent volume for metering and quantification; closely approximates the principle of pipettes used in chemical laboratories for highly accurate metering and quantification; is convenient and simple; and can achieve automatic online precise metering and quantitative injection of multiple reagents, metering and quantifying any volume to meet the different reagent metering volumes of automatic online instruments. Its compact structure and simple layout not only meet the needs of precise quantitative metering and injection of multiple solutions, but also improve the product's integration, stability, and accuracy, while reducing the product's failure rate and cost. Attached Figure Description

[0027] Figure 1 is a structural schematic diagram of a specific embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the extraction and metering state in a specific embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the precise quantitative state of a specific embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of the reverse propulsion sample state in a specific embodiment of the present invention;

[0031] Figure 5 is a schematic diagram of the metering module of the present invention;

[0032] Figure 6 is a schematic diagram of another embodiment of the metering module of the present invention;

[0033] Figure 7 is a schematic diagram of the extended application of a specific embodiment of the present invention (two to N sets of metering); Figure 8 is a schematic diagram of the solution dilution application of a specific embodiment of the present invention.

[0034] In the diagram: 1. Metering module; 1-1. Right metering body; 1-2. Left metering body; 1-3. Metering tube; 2. Driver; 3. No. 1 two-position three-way valve; 4. Spiral tube; 5. No. 2 two-position three-way valve; 6. Storage slot;

[0035] 7. Stop valve; 8. Pinch valve head; 9. Photodetector; 10. Control module; 11-N. Shut-off valve. Detailed Implementation

[0036] To facilitate understanding of the technical means, creative features, objectives, and effects of this invention, the invention is further described below in conjunction with specific embodiments. In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] like Figure 1-8As shown, a multi-solution precise quantitative metering and injection system includes a control module 10, a metering module 1, an actuator 2, a spiral tube 4, a reactor 6, a pinch valve 8, a photodetector 9, and shut-off valves 11-N, a first two-position three-way valve 3, and a second two-position three-way valve 5. The metering module 1 includes a metering tube 1-3, a left metering body 1-2 that selectively connects to multiple shut-off valves 11-N, and a right metering body 1-1 that connects to the actuator 2, the pinch valve 8, the stop valve 7, and the left metering body 1-2. The common end of the first two-position three-way valve 3 is connected to the actuator 2, its normally open end is connected to air, and its normally closed end is connected to the spiral tube 4. The common end of the second two-position three-way valve 5 is connected to the reactor 6, its normally open end is connected to the spiral tube 4, and its normally closed end is connected to air. The control module 10 is connected to the actuator 2, the photodetector 9, the pinch valve 8, the first two-position three-way valve 3, and the multiple shut-off valves 11-N to control their on / off states and status.

[0039] This invention discloses a sample injection method for a multi-solution precise quantitative metering injection system, characterized by comprising the following steps:

[0040] ① Extraction and metering: Under the control of the control module 10, a certain shut-off valve 11-N is opened. Under the suction force of the clockwise rotation of the driver 2, the reagent enters the left metering body 1-2 cavity, metering tube 1-3, and the suction tube of the right metering body 1-1 through the corresponding pipeline and connector from the opened shut-off valve 11-N. After overflowing, it enters the overflow tube and is detected by the photoelectric detector 9 or after a fixed time is set. The driver 2 stops rotating, and the extraction and metering is completed.

[0041] ② Precise quantification: After the extraction and measurement are completed, under the control of the control module 10, the reagent shut-off valve 11-N is closed, the driver 2 rotates counterclockwise for a certain period of time and then stops, the stop valve 7 is opened, the driver 2 rotates counterclockwise, the shut-off valve 11-N is opened, and the measured reagent enters the reactor 6 and the spiral tube 4 through the stop valve 7 under the suction of the driver. The reagent is temporarily stored in the spiral tube 4, thus completing the quantification of the reagent.

[0042] ③ Reverse propulsion: Under the control of the control module 10, the reagent in the spiral tube 4 enters the reactor 6 through the two-position three-way valve 5, thus completing the reverse propulsion.

[0043] The measuring element of the present invention is as follows Figure 5As shown, the metering module includes a right metering body 1-1, a left metering body 1-2, and a connecting tube 1-3. Metering tube 1-3 can extend partially into the cavity of the right metering body 1-1, or only its top can reach the inclined surface. The overflow receiving tube is located at the lowest point of the cavity of the right metering body 1-1 and then connects to the clamp valve via a photoelectric detector and a flexible tube. The left metering body 1-2 has multiple pipelines, one of which is connected to a corresponding shut-off valve; the specific number depends on the type and quantity of the reagent to be metered. The left metering body 1-2 is vertically connected to the shut-off valve via a connector to allow air circulation. In special cases, another configuration of the metering body may exist, such as... Figure 6 As shown, the metering module is a single unit, comprising a through-flow suction pipe, a through-flow overflow pipe, and a cover at the top of the suction pipe. The suction pipe extends partially into the cover, and the overflow pipe is located at the lowest point of the cover. It then connects to the clamp valve via a photoelectric switch and a flexible hose. The metering body has multiple horizontal pipes, one of which connects to a corresponding shut-off valve. These horizontal pipes are connected to the vertical suction pipe running through the metering body, with the connection point at the center. The metering body also has multiple vertical pipes connected to a multi-channel body, with another pipe from the multi-channel body connected to a shut-off valve for air supply. Furthermore, the vertical pipes of the metering body are correspondingly connected to the horizontal pipes, with the intersection point as far away from the center point as possible.

[0044] Extended applications of specific embodiments of the present invention, such as Figure 7 As shown, a two-position three-way valve is added between the driver and the right metering body 1-1, with its common end connected to the driver. A two-position three-way valve is also added between the stop valve 7 and the right metering body 1-1, with its common end connected to the stop valve 7. The normally open and normally closed ends of the two added two-position three-way valves are connected to the two sets of right metering bodies 1-1 respectively, thus realizing the application of two sets of one-time multi-solution precise quantitative metering injection. Correspondingly, it can be expanded to N sets of one-time multi-solution precise quantitative metering injection applications.

[0045] The specific embodiments of the present invention include solution dilution applications such as... Figure 8 As shown, a new two-position three-way valve is connected between the second two-position three-way valve 5 and the spiral tube 4. The common end of the new two-position three-way valve is connected to the normally open end of the second two-position three-way valve 5, and the normally open end of the new two-position three-way valve is connected to the spiral tube 4. Its normally closed end is connected to one of the shut-off valves 11-N, which can be used to dilute the solution in the reactor.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-solution precise quantitative metering and injection system, characterized in that: The multi-solution precise quantitative metering and injection system includes a control module (10), a metering module (1), an actuator (2), a spiral tube (4), a reactor (6), a pinch valve (8), a photodetector (9), and shut-off valves (11-N), a first two-position three-way valve (3), and a second two-position three-way valve (5). The metering module (1) includes a metering tube (1-3) and a left metering body (1-2) that selectively connects to multiple shut-off valves (11-N), and connects to the actuator (2), pinch valve (8), stop valve (7), and left metering body (11-N). -2) The right metering body (1-1), the common end of the first two-position three-way valve (3) is connected to the driver (2), its normally open end is connected to air, and its normally closed end is connected to the spiral tube (4), the common end of the second two-position three-way valve (5) is connected to the reactor (6), its normally open end is connected to the spiral tube (4), and its normally closed end is connected to air, the control module (10) is connected to the driver (2), photodetector (9), pinch valve (8), first two-position three-way valve (3), and multiple shut-off valves (11-N) respectively to control their on / off and status; The right measuring body (1-1) has a vertical tube at a relatively high position in the internal cavity. The measuring tube (1-3) extends into the cavity to a certain extent. There is an overflow receiving tube at a relatively low position in the internal cavity. The upper end of the overflow receiving tube of the right measuring body (1-1) has a photoelectric detector (9), and the bottom end is connected by a flexible tube and the flexible tube passes through a clamp valve (8). The top of the vertical tube of the right measuring body (1-1) cavity is connected to the top of the overflow receiving tube through a slope or groove. Once the target reagent overflows from the top of the measuring tube (1-3), it immediately enters the overflow receiving tube. The bottom end of the vertical tube of the right measuring body (1-1) is connected to the stop valve (7) through a connector. The side of the measuring tube (1-3) is connected to the bottom connector of the left measuring body (1-2) through a connector.

2. The multi-solution precise quantitative metering and injection system according to claim 1, characterized in that: The right measuring body (1-1) has a sealing cover at the top of its internal cavity, which is completely sealed by a sealing ring. The cover has a connector for connecting to the driver (2). The measuring body is made of glass, polytetrafluoroethylene, ceramic or plexiglass, and the cavity is circular, conical or other polygonal. The clamp valve (8) controls the opening and closing of the hose and ensures a complete seal. The overflow receiver is made of transparent glass or plexiglass. The diameter of the overflow receiver is determined to ensure that the liquid and reagent can flow down. The overflow of the right measuring body (1-1) is also replaced by a timed replacement of the photoelectric detector (9). The bottom end of the vertical pipe of the right measuring body (1-1) is also connected to the bottom end connector of the left measuring body (1-2) through a connector, and is connected to the shut-off valve (11-N) through a connector on the side of the vertical pipe.

3. The multi-solution precise quantitative metering and injection system according to claim 2, characterized in that: The left measuring body (1-2) also has a cavity, which is cylindrical, conical, spherical or rhomboid in shape. The top has a cap that is sealed by a sealing rubber ring to achieve a complete sealing effect. There is a connector in the middle of the cap that connects to the pipeline and the shut-off valve (11-N). Multiple shut-off valves (11-N) can be connected to one of the vertical sides of the cavity to realize the connection of multiple reagent pipelines. The position of the through-hole diameter of the left measuring body (1-2) can be adjusted, and the through-hole is customized according to the angle, height or position; the multiple shut-off valves (11-N) connected to the left measuring body (1-2) are matched according to the number of reagents.

4. The multi-solution precise quantitative metering and injection system according to claim 3, characterized in that: The right measuring body (1-1) and the left measuring body (1-2) are connected by a measuring tube (1-3) through a connector. The tube is made of a corrosion-resistant material. The length and inner diameter of the tube are optional and depend on the required measuring volume. The tube can be transparent, semi-transparent or opaque. The internal aperture of the right measuring body (1-1) and the left measuring body (1-2) is 1mm or 2mm, depending on the size of the impurities in the liquid to ensure that it is not blocked. The metering tube (1-3) connecting the right metering body (1-1) and the left metering body (1-2) is clamped in the middle of the tube to assist in determining whether the reagents and solutions to be metered in a multi-solution precise quantitative metering injection system have been used up and whether they have been successfully quantified.

5. The multi-solution precise quantitative metering and injection system according to claim 4, characterized in that: The overflow port of the metering vertical tube of the right metering body (1-1) is equipped with a liquid path detection switch. Once the solution or reagent overflows, it will be detected by the liquid path detection switch immediately to assist in determining whether the reagent and solution to be metered in a multi-solution precise quantitative metering injection system have been used up and whether they have been successfully quantified.

6. The multi-solution precise quantitative metering and injection system according to claim 2, characterized in that: The clamp valve and hose used to control the opening and closing of the hose are replaced with a shut-off valve (11-N) and a rigid pipe, which are connected to the bottom end of the overflow receiving pipe through a connector.

7. The multi-solution precise quantitative metering injection system according to claim 2, characterized in that: The reactor has a cavity inside, with the upper end connected to the stop valve (7) and the lower end connected to the common end of the second two-position three-way valve (5). The material is glass or ceramic, and the volume is determined according to the needs. It can be transparent or opaque, depending on the needs.

8. The multi-solution precise quantitative metering and injection system according to claim 1, characterized in that... At: The spiral tube is made of a corrosion-resistant material. The length and inner diameter of the spiral tube are optional. The total volume of the spiral tube should be greater than the volume of the reactor, with a margin of 10-50%.

9. The injection method of a multi-solution precise quantitative metering injection system according to any one of claims 1-8, characterized in that: Includes the following steps: ① Extraction and measurement: Under the control of the control module (10), a certain shut-off valve (11-N) is opened. Under the suction force of the clockwise rotation of the driver (2), the reagent enters the left measuring body (1-2) cavity, measuring tube (1-3) through the open shut-off valve (11-N) and the suction tube of the right measuring body (1-1) through the corresponding pipeline and connector. After overflowing, it enters the overflow tube and is detected by the photoelectric detector (9) or a fixed time is set. The driver (2) stops rotating, and the extraction and measurement is completed. ②Accurate quantification: After the extraction and measurement are completed, under the control of the control module (10), the reagent shut-off valve (11-N) is closed, the driver (2) rotates counterclockwise for a certain period of time and stops, the stop valve (7) is opened, the driver (2) rotates counterclockwise, the shut-off valve (11-N) is opened, and the measured reagent enters the reactor (6) and the spiral tube (4) through the stop valve (7) under the suction of the driver. The reagent is temporarily stored in the spiral tube (4) to complete the quantification of the reagent. ③ Reverse propulsion: Under the control of the control module (10), the reagent in the spiral tube (4) enters the reactor (6) through the two-position three-way valve (5) under the clockwise thrust of the driver (2), thus completing the reverse propulsion.

10. The injection method according to claim 9, characterized in that... At: The driver (2) can rotate clockwise and counterclockwise and the speed can be adjusted; the driver (2) can be controlled to operate and the metering reagent can be judged by setting a fixed time, and the liquid can also be detected by photoelectric detector (9) to judge the metering quantity.

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