A range switching cuvette measuring device

Abstract

The utility model discloses a kind of range switching cuvette measuring devices, belong to the technical field of water quality monitoring equipment, including pedestal, optical module and colorimetric module are equipped on pedestal, optical module includes light source piece and light detector, light source piece and light detector are respectively placed in the two sides of colorimetric module, colorimetric module includes cuvette body, the inside of cuvette body is provided with measuring area, measuring area has at least two different measurement ranges, switching module is equipped on pedestal, switching module is connected with cuvette body.The utility model can realize the internal automatic switching range of cuvette measuring device, without dismounting replacement, simplify the procedure of switching range, simultaneously avoid the situation that reagent and to-be-measured liquid remain in the inner wall of cuvette occurs, reduce measurement error, and then improve the effect of the accuracy of measurement.

Description

Technical Field

[0001] This utility model relates to the technical field of water quality monitoring equipment, and in particular to a range-switching cuvette measuring device. Background Technology

[0002] In existing technologies, colorimetry is a method for determining the content of an analyte by comparing or measuring the color depth of a colored solution. Two commonly used colorimetric methods are visual colorimetry and photoelectric colorimetry, both based on the Lambert-Beer Law.

[0003] Colorimetric measurement is an analytical method that determines the concentration or content of a substance by measuring the color change of a substance in a solution or sample.

[0004] Regarding the aforementioned technologies, the applicant has found that colorimetric measuring devices used in the market require the replacement of cuvettes with different ranges to switch between them. Furthermore, the internal optical components of the cuvettes have high cleanliness requirements, and the disassembly and replacement procedures are cumbersome and complex. If reagents or test solutions enter the cuvette during disassembly and replacement, even in trace amounts, they can cause measurement errors and affect the accuracy of the measurements. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a cuvette measuring device with a range switching capability. This device enables automatic range switching within the cuvette measuring device without disassembly or replacement, simplifying the range switching process. It also prevents reagent and test solution residues from remaining on the inner wall of the cuvette, reducing measurement errors and thus improving measurement accuracy.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A range-switching cuvette measuring device includes a base, on which an optical module and a colorimetric module are provided. The optical module includes a light source and a photodetector, which are respectively placed on both sides of the colorimetric module. The colorimetric module includes a cuvette body, and a measurement area is opened inside the cuvette body. The measurement area has at least two different measurement ranges. A switching module is provided on the base and is connected to the cuvette body.

[0008] Furthermore, the switching module is a rotating structure, and the measurement area inside the cuvette body is arranged in the form of a vertical even-numbered polygonal prism. The even-numbered polygonal prism has at least two different measurement ranges, and the switching module is rotatably connected to the cuvette body.

[0009] Furthermore, the switching module is a sliding structure, and the measuring area inside the cuvette body is provided with at least two cuboids arranged vertically, each cuboid having at least two different measuring ranges, and the switching module is slidably connected to the cuvette body.

[0010] Furthermore, the switching module has a spiral structure, and the measurement area inside the cuvette body is provided with at least two cuboids arranged vertically, each cuboid having at least two different measurement ranges. The switching module is spirally connected to the cuvette body.

[0011] Furthermore, the cuvette body is provided with a positioning structure, and the cuvette body is positioned and cooperated with the upper cuvette seat or the lower cuvette seat through the positioning structure.

[0012] Furthermore, the cuvette body is equipped with a heating resistor and a temperature sensor.

[0013] Furthermore, a magnetic stirring module is provided at the bottom of the cuvette body.

[0014] Furthermore, the magnetic stirring module includes a magnetic stir bar, and a stirring area is provided below the measuring area of ​​the cuvette body, with the magnetic stir bar placed within the stirring area.

[0015] In summary, compared with the prior art, the beneficial effects of the above technical solution are:

[0016] 1. This application enables automatic switching of the measuring range within the cuvette measuring device without disassembly or replacement, simplifying the steps of switching the measuring range. It also avoids the occurrence of reagent and test solution residues on the inner wall of the cuvette, reducing measurement errors and thus improving measurement accuracy.

[0017] 2. This application can quickly and accurately switch between measurement ranges without replacing cuvettes of different ranges. Combined with the positioning structure, it makes the positioning of the range switching operation more precise and the measurement more accurate.

[0018] 3. This application achieves real-time monitoring of automatic anti-fogging through heating resistors and temperature sensors, and automatically heats the measurement area to prevent fogging.

[0019] 4. This application makes cleaning and replacing the optical module more convenient, and the addition of a magnetic stirring module makes the measurement more stable and accurate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure in Embodiment 1 of this utility model;

[0021] Figure 2 This is a schematic diagram of the colorimetric module in Embodiment 1 of this utility model;

[0022] Figure 3 This is a front view of the colorimetric module in Embodiment 1 of this utility model;

[0023] Figure 4 This is a diagram showing the positioning structure of the base in Embodiment 1 of this utility model;

[0024] Figure 5 This is a structural diagram of range switching state 1 in Embodiment 1 of this utility model;

[0025] Figure 6 This is a structural diagram of the range switching state 2 in Embodiment 1 of this utility model;

[0026] Figure 7 This is a structural diagram of range switching state 1 in embodiment 2 of this utility model;

[0027] Figure 8 This is a structural diagram of range switching state 2 in embodiment 2 of this utility model;

[0028] Figure 9 This is a diagram showing the positioning structure of the base in Embodiment 2 of this utility model;

[0029] Figure 10 This is a structural diagram showing the positioning of the cuvette body in Embodiment 3 of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Base; 2. Inlet seat; 3. Upper seat screw; 4. Inlet plug; 5. Needle; 6. O-ring; 7. Upper sealing gasket; 8. Cuvette body; 9. Elastic plunger; 10. Photodetector; 11. Magnetic stir bar; 12. Drain seat; 13. Lower seat screw; 14. Stepper motor; 15. Bevel gear A; 16. Magnet body; 17. Magnet mounting component; 18. Stirring motor; 19. Set screw; 20. Bevel gear B; 21. Lower cuvette seat; 22. Lower sealing gasket; 23. Light source component; 24. Upper cuvette seat. Detailed Implementation

[0032] The principles and features of this utility model are described below with reference to all the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0033] This utility model discloses a range-switching cuvette measuring device.

[0034] Example 1

[0035] Reference Figure 1A range-switching cuvette measuring device is mainly composed of an optical module, a colorimetric module, a switching module, and a magnetic stirring module. It includes a base 1, on which the optical module and the colorimetric module are mounted. The optical module includes a light source 23 and a photodetector 10, which are respectively positioned on opposite sides of the colorimetric module.

[0036] Reference Figure 1 The colorimetric module includes a cuvette body 8, which has a measurement area inside, with at least two different measurement ranges. The switching module is a rotating structure. The measurement area inside the cuvette body 8 is arranged as a vertical even-numbered polygonal prism, with at least two different measurement ranges. The switching module is rotatably connected to the cuvette body 8.

[0037] Reference Figure 1 In this embodiment 1, the measuring area of ​​the cuvette body 8 is rectangular and vertically arranged. The length and width of the cuvette are different measuring ranges, and the measuring range can be quickly switched by rotating it.

[0038] Reference Figure 1 and Figure 2 The cuvette body 8 is equipped with a positioning structure, which allows it to be positioned and engaged with the upper cuvette seat 24 or the lower cuvette seat 21. The cuvette body 8 also includes a heating resistor and a temperature sensor.

[0039] Reference Figure 1 and Figure 2 The colorimetric module includes an inlet seat 2, an upper seat screw 3, an inlet plug 4, a needle 5, an O-ring 6, an upper sealing gasket 7, a cuvette body 8, an outlet seat 12, a lower seat screw 13, a lower cuvette seat 21, a lower sealing gasket 22, and an upper cuvette seat 24.

[0040] Reference Figure 1 The base 1 is equipped with a switching module, which is connected to the cuvette body 8. The switching module includes an elastic plunger 9, a stepper motor 14 (servo motor), a bevel gear A15, and a bevel gear B20.

[0041] Reference Figure 1 A magnetic stirring module is provided below the cuvette body 8. The magnetic stirring module includes a magnetic stir bar 11, and a stirring area is provided below the measuring area of ​​the cuvette body 8, where the magnetic stir bar 11 is placed. The magnetic stirring module includes the magnetic stir bar 11, a magnet body 16, a magnet mounting part 17, a stirring motor 18, and a set screw 19.

[0042] This application enables rapid and accurate range switching without the need to replace the cuvette body 8 with different ranges. Combined with the positioning structure, it makes the positioning of the range switching operation more precise and the measurement more accurate.

[0043] Reference Figure 1 , Figure 2 and Figure 3 The cuvette body 8 can be integral or separate. In this embodiment 1, the cuvette body 8 is separate, consisting of an upper cuvette seat 24 and a lower cuvette seat 21, which are connected by an upper seat screw 3 and a lower seat screw 13 in the internal screw holes.

[0044] Reference Figure 1 , Figure 2 and Figure 3 The cuvette body 8 has an internal structure that matches the internal area structure and the external shape of the cuvette body 8. The measurement area is placed inside the cuvette body 8 to form the internal area structure of the cuvette body 8. The upper sealing gasket 7 and the lower sealing gasket 22 are installed at the upper and lower ends of the cuvette body 8, respectively, to ensure the internal sealing between the cuvette body 8 and the cuvette upper seat 24 and the cuvette lower seat 21.

[0045] Reference Figure 1 , Figure 2 and Figure 3 The cylindrical structures on the outside of the upper cuvette seat 24 and the lower cuvette seat 21 cooperate with the cylindrical hole structure inside the base 1. The cooperation structure allows the colorimetric module to be better fixed on the base 1 and rotated by switching modules.

[0046] Reference Figure 1 , Figure 2 and Figure 4 The inlet plug 4 is inserted into the upper end of the inlet seat 2, and the two are sealed by an O-ring 6 to ensure sealing and proper positioning. The inlet seat 2 is connected to the cuvette upper seat 24 by an upper screw 3, and an upper sealing gasket 7 is installed between the cuvette body 8 and the cuvette upper seat 24. The inlet plug 4 is designed with two inlet channels and one air channel. The reagent and the test solution enter the cuvette body 8 through the inlet channels of the inlet plug 4 and the needle 5. The needle 5 can perform titration, avoid reagent residue, and ensure the accuracy of the amount of reagent entering the cuvette body 8 and reaching the reagent measurement area.

[0047] Reference Figure 1 , Figure 2 and Figure 4 The drain seat 12 is connected to the cuvette lower seat 21 by a lower seat screw 13, and a lower sealing gasket 22 is installed between them. The internal cavity of the drain seat 12, the internal cavity of the cuvette lower seat 21, and the internal cavity of the cuvette body 8 together form the reagent measurement area and the stirring area.

[0048] Reference Figure 1 , Figure 2 and Figure 4The drain seat 12 is designed with a drain channel that connects to an external pump or valve. When reagents and test solutions are injected, the external pump or valve is closed, and the drain channel is sealed. After the measurement is completed, the external pump or valve is opened, the drain channel is opened, and the reagents and test solutions are drained.

[0049] Reference Figure 1 Stepper motor 14 (servo motor) drives bevel gear A15 to rotate bevel gear B20. Bevel gear B20 is connected and fixed to drain seat 12, driving the entire colorimetric module to rotate clockwise and counterclockwise within the cylindrical hole structure of base 1.

[0050] Reference Figure 1 , Figure 3 and Figure 4 The cuvette upper seat 24 has positioning ball holes evenly distributed on its stepped bottom surface. An elastic plunger 9 is installed on the upper part of the base 1, engaging with the positioning ball holes on the bottom surface of the cuvette upper seat 24 to position the entire colorimetric module. When the switching module rotates the colorimetric module clockwise or counterclockwise on the base 1, the elastic plunger 9 is compressed and disengages from the positioning ball holes. When the colorimetric module rotates to a specified angle, the elastic plunger 9 enters the corresponding positioning ball holes, achieving positioning. Additionally, the cuvette lower seat 21 has a positioning area structure, and a positioning pin is installed on the lower part of the base 1. The positioning pin engages with the positioning area structure on the cuvette lower seat 21, controlling the clockwise and counterclockwise rotation angle range of the entire colorimetric unit component. The engagement of the elastic plunger 9 with the positioning ball holes and the positioning pin with the positioning area structure on the cuvette lower seat 21 ensures more accurate rotation angle and position of the entire colorimetric module.

[0051] Reference Figure 1 , Figure 3 and Figure 4 The cuvette body 8 is made of metal, and a heating resistor and a temperature sensor are installed on it. When the temperature sensor detects that the temperature of the measurement area of ​​the cuvette is lower than the set value, the control circuit automatically controls the heating resistor to operate, raising the temperature of the measurement area of ​​the cuvette and preventing condensation on the surface of the cuvette, which would affect the measurement, thus achieving the defogging function. Regardless of changes in ambient temperature or the temperature of the test liquid, the cuvette will not fog, thus achieving stable and accurate measurements. This application achieves real-time monitoring of automatic anti-fogging through the heating resistor and temperature sensor, automatically heating the measurement area to prevent fogging.

[0052] Reference Figure 1 , Figure 5 and Figure 6When the light emitted by the light source 23 passes through the light source cavity A of the cuvette upper seat 24, the stepped structure of the cavity reduces the diameter of the emitted light without losing effective light energy, thus reducing the influence of stray light on the measurement. After passing through the light source cavity, the light passes through the cuvette body 8 and enters the measurement area of ​​the reagent, illuminating the test liquid. Different concentrations of the test liquid will produce different absorption intensities for the detection light. The detection light after absorption by the test liquid enters the detection cavity A and is received by the photodetector 10. The concentration of the test liquid is calculated based on the residual light intensity of the detection light received by the photodetector 10. After passing through the test liquid, the light enters the detection cavity A and is received by the photodetector 10. When switching the measurement range, the colorimetric module rotates to a fixed angle, aligning the light source with the light source cavity B of the cuvette upper seat 24. At the same time, the photodetector 10 is aligned with the detection cavity B of the cuvette upper seat 24. After completing the switching action and ensuring the optical path alignment through the positioning structure, optical measurement is performed.

[0053] For different measurement ranges, the length and other dimensions of the light source cavity A and light source cavity B, as well as the probe cavity A and probe cavity B, are adjusted according to the light wavelength to ensure measurement accuracy.

[0054] Reference Figure 1 The magnetic stirring module, located below the colorimetric module, mainly consists of a stirring motor 18, magnet bodies 16, magnet mounting parts 17, set screws 19, and a magnetic stir bar 11. The S and N poles of the two magnet bodies 16 are mounted opposite each other in the magnet mounting parts 17 and connected and fixed to the stirring motor 18 by the set screws 19. An electrical signal controls the stirring motor 18 to rotate forward and backward, driving the magnet bodies 16 to rotate and generate a magnetic field.

[0055] Reference Figure 1 Below the cuvette body 8, the cavity structure formed by the cuvette base 21 and the drain seat 12 is called the stirring area, which houses a magnetic stir bar 11. The magnetic stir bar 11 rotates under the influence of the magnetic field generated by the rotating magnet body 16 of the magnetic stirring module, thereby stirring the test liquid inside the cuvette body 8. This allows the test liquid and the components of the colorimetric reagent to quickly and fully complete the chemical reaction and achieve a stable water sample color state, while simultaneously eliminating air bubble interference in the liquid, making the measurement more accurate. This application makes cleaning and replacing the optical module more convenient, and the addition of the magnetic stirring module makes the measurement more stable and accurate.

[0056] This application enables automatic switching of measurement ranges within the cuvette measuring device without disassembly or replacement, simplifying the process of switching ranges. It also avoids the occurrence of reagent and test solution residues on the inner wall of the cuvette, reducing measurement errors and thus improving measurement accuracy.

[0057] Example 2

[0058] Reference Figure 1 , Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 lies in the switching module and the colorimetric module. The switching module is a sliding structure. The measuring area inside the cuvette body 8 is provided with at least two cuboids arranged vertically, each cuboid having at least two different measuring ranges. The switching module is slidably connected to the cuvette body 8.

[0059] Reference Figure 1 , Figure 7 , Figure 8 and Figure 9 In Embodiment 2, the switching module is a linear sliding switching structure, and the cuvette body 8 in the colorimetric module is an irregularly shaped cuvette with two types of cuvettes arranged vertically. Correspondingly, the cuvette body 8 also has two sets of optical path structures: a light source cavity A and a detector cavity A, and a light source cavity B and a detector cavity B. The base 1 and the cuvette body 8 are connected by a linear groove structure as a linear movement track. After the two move relative to each other, the light source cavity and the detector cavity can be switched to align with the light source 23 and the photodetector 10, respectively, to reach the corresponding test positions. The above two test positions are positioned by a positioning structure. After the light source cavity and the detector cavity have moved to the test positions, positioning pins are inserted into the positioning holes to achieve the positioning function.

[0060] Example 3

[0061] Reference Figure 1 and Figure 10 The difference between this embodiment and embodiment 1 lies in the switching module and the colorimetric module. The switching module has a spiral structure. The measuring area inside the cuvette body 8 is provided with at least two cuboids arranged vertically, each cuboid having at least two different measuring ranges. The switching module is spirally connected to the cuvette body 8.

[0062] Reference Figure 1 and Figure 10 In embodiment 3, the switching module is a spiral lifting switching structure. The cuvette body 8 and the base 1 move relative to each other via a boss on the cuvette body 8 within a spiral groove in the base 1. The two ends of the spiral groove are two platform structures, whose positions correspond to the two test positions. When the boss reaches the test position, the light source hole and detector hole on the base 1 align with the light source element 23 and the photodetector 10, as well as the light source cavity and detector cavity on the cuvette body 8, respectively, and are positioned using the positioning structure. This achieves the purpose of switching measurement ranges.

[0063] In summary, combining the above embodiments 1 / 2 / 3, the operation steps include the following:

[0064] Step 1: According to the requirements of the test liquid, switch the measurement range of the colorimetric module by switching the module;

[0065] Step 2: Position the cuvette using the positioning structure on the cuvette body 8;

[0066] Step 3: Activate the magnetic stirring module to stir the test solution, so that the test solution and the components of the colorimetric reagent can quickly and fully complete the chemical reaction;

[0067] Step 4: Perform colorimetric measurements on the test liquid using an optical module.

[0068] The implementation principle of the range-switching cuvette measuring device of this utility model is as follows:

[0069] First, according to the requirements of the test liquid, the measurement range of the colorimetric module is switched by the switching module. Then, the positioning is achieved by the positioning structure on the cuvette body 8. After that, the magnetic stirring module is activated to stir the test liquid, so that the test liquid and the components of the colorimetric reagent can quickly and fully complete the chemical reaction. Finally, the test liquid is measured by colorimetry through the optical module.

[0070] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A range-switching cuvette measuring device, characterized in that: The device includes a base (1), on which an optical module and a colorimetric module are provided. The optical module includes a light source (23) and a photodetector (10), which are respectively placed on both sides of the colorimetric module. The colorimetric module includes a cuvette body (8), which has a measurement area inside. The measurement area has at least two different measurement ranges. The base (1) is provided with a switching module, which is connected to the cuvette body (8).

2. The range-switching cuvette measuring device according to claim 1, characterized in that: The switching module is a rotating structure. The measurement area inside the cuvette body (8) is set as a vertical even-numbered polygonal prism. The even-numbered polygonal prism has at least two different measurement ranges. The switching module is rotatably connected to the cuvette body (8).

3. The range-switching cuvette measuring device according to claim 1, characterized in that: The switching module is a sliding structure. The measuring area inside the cuvette body (8) is provided with at least two cuboids arranged vertically, each cuboid having at least two different measuring ranges. The switching module is slidably connected to the cuvette body (8).

4. The range-switching cuvette measuring device according to claim 1, characterized in that: The switching module is a spiral structure. The measuring area inside the cuvette body (8) is provided with at least two cuboids arranged vertically, each cuboid having at least two different measuring ranges. The switching module is spirally connected to the cuvette body (8).

5. The range-switching cuvette measuring device according to claim 1, characterized in that: The cuvette body (8) is provided with a positioning structure, and the cuvette body (8) is positioned and cooperated with the cuvette upper seat (24) or the cuvette lower seat (21) through the positioning structure.

6. The range-switching cuvette measuring device according to claim 1, characterized in that: The cuvette body (8) is equipped with a heating resistor and a temperature sensor.

7. The range-switching cuvette measuring device according to claim 1, characterized in that: A magnetic stirring module is provided below the cuvette body (8).

8. The range-switching cuvette measuring device according to claim 7, characterized in that: The magnetic stirring module includes a magnetic stir bar (11), and a stirring area is provided below the measuring area of ​​the cuvette body (8), with the magnetic stir bar (11) placed within the stirring area.

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